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Saudi Arabia - Kuwait Neutral Zone
Abstract Oil production in the United States (US) increased rapidly in the last decade due to the extensive development of tight-oil resources like Permian, Eagle Ford and Bakken. Most of these resources benefit from being in a source rock or in a close proximity to a source rock and they can be called here source-related tight-oil resources. There are also non-source tight-oil resources, such as the vast tight-carbonate resources in the Middle East. In this paper, a detailed characterization of Middle East non-source tight-oil carbonates is presented and compared to source-related tight-oil resources and their development potential is demonstrated through numerical simulation. A conceptual 2D commercial simulation model is used to assess the factors affecting the development of non-source tight-oil formations. The model is capable of simulating the effect of key parameters on production from tight naturally fractured reservoirs with vertical and fractured horizontal wells. Improved recovery options, such as waterflooding and gas injection, can also be evaluated under different reservoir characteristics. Tight-carbonate reservoirs possess the structural characteristics of conventional reservoirs while sharing the low-permeability, natural-fracture, and small-scale heterogeneity attributes of source-related, tight-oil resources. Moreover, they pose their unique challenges such as scale-dependent variability of their properties, sensitivity to acid fluids, the need for improved recovery techniques and complex wetting properties. The simulation results show that these formations are more sensitive to natural fractures compared to high permeability reservoirs and fractured horizontal wells are an essential technology. The viability of improved recovery techniques, such as waterflooding and gas injection, in these formations may be a critical factor for development decisions. Most of the resource development strategies that are available in the literature are focusing on either conventional high permeability reservoirs or unconventional source-related resources. Due to the success of the technologies used in the US unconventional plays, development potential of the non-source tight-oil formations has emerged as an industry interest. This paper sheds light on the development of another type of oil resource which is abundant in the Middle East and around the world.
- Europe (1.00)
- North America > United States > North Dakota (0.47)
- Asia > Middle East > Saudi Arabia (0.47)
- (2 more...)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.73)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.69)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.32)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- (8 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Waterflooding (1.00)
Acid Fracture Conductivity Testing on the Tight Carbonate Ratawi Limestone in the Partitioned Zone
Naik, Sarvesh (Chevron Energy Technology Company) | Dean, Mark (Saudi Arabian Chevron) | McDuff, Darren (Chevron Energy Technology Company) | Ranson, Andrew (Saudi Arabian Chevron) | Jin, Xiao (Texas A&M University) | Zhu, Ding (Texas A&M University) | Hill, Alfred Dan (Texas A&M University)
Saudi Arabian Chevron (SAC) partnered with the Texas A&M University Petroleum Engineering Department and Reservoir Productivity Geomechanics Team of Chevron's Energy Technology Center (ETC) to perform acid fracturing conductivity tests on the Ratawi Limestone core samples. These tests were also performed on an analog limestone from an onshore USA field and Indiana Limestone samples for comparison with the results from the Ratawi Limestone samples. This paper shows the results of the acid fracture conductivity tests using various acid treatment systems on three different limestone formations and compares the acid etching and conductivity responses between homogeneous and heterogeneous mineralogy. The success of acid fracturing treatment depends on the creation and sustainability of fracture conductivity under reservoir conditions. The fracture conductivity depends on the reservoir rock & acid reactivity, acid-etched pattern, closure stress on the fracture face and the pore pressure depletion. Laboratory testing shows that acid fracturing is a viable option for large-scale development of the Ratawi Limestone. Its heterogeneous mineralogy plays an important role for sustaining the fracture conductivity after acid injection. Composed primarily of calcite and dolomite, limestone dissolves positively in acid. However, the insoluble minerals, such as the clay streaks with higher mechanical properties, acted as pillars to partially prop the fractures open as closure stress was applied. Essentially, the heterogeneous mineralogy of this formation assists with sustaining fracture conductivity as the reservoir pressure depletes.
- Asia > Middle East (1.00)
- North America > United States > Texas (0.89)
- Europe > Russia > Northwestern Federal District > Komi Republic (0.24)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Limestone (1.00)
- Geology > Mineral (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Lifecycle > Test/Measurement (0.41)
- Europe > Russia > Northwestern Federal District > Komi Republic > Timan-Pechora Basin > Pechora-Kolva Basin > Usa Field (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- (5 more...)
Although the Partitioned Zone (PZ) between Saudi Arabia and Kuwait has been a prolific producer for over sixty years, significant resource potential remains in underexplored stratigraphic intervals. The Upper Cretaceous Hartha Formation is one of these opportunities. The Hartha interval has been penetrated by numerous wells targeting the deeper section in PZ, and although hydrocarbon presence has been observed in the Hartha, the play has not been fully characterized prior to this study. Stratigraphic studies using core and well data concluded that the Hartha was deposited on a broad, low-angle carbonate ramp setting that includes the outer ramp, middle ramp, ramp margin, and inner ramp environments. Gross Depositional Environment maps were constructed based on these interpretations and show an approximately N-S strike-oriented ramp, similar to the orientation of the present-day shoreline of the PZ. Reactivation of basement highs during the Late Cretaceous influenced Hartha deposition, with high-energy grainstones deposited over and around these structural highs having the best potential for reservoir development. Seismic interpretation was performed on recently acquired PZ 3D data to map key surfaces in the Hartha to Ahmadi section. The Hartha interval thins over structural highs and is significantly eroded by the pre-Hartha and pre-Aruma unconformities. This paleo-high structural trend in western PZ is also where the ramp margin grainstone fairway had developed and has been interpreted to contain the best reservoirs. Prospective areas are primarily structural closures over these highs inside the ramp margin fairway with stratigraphic facies changes to non-reservoir facies defining the lateral extent of the trap.
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (0.30)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (0.30)
- Geology > Sedimentary Geology (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone ("Partitioned Zone") > Arabian Gulf > Arabian Basin > Arabian Gulf Basin > Safaniya Field (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone ("Partitioned Zone") > Arabian Basin > Widyan Basin > Wafra Joint Operations Block > Wafra Field (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone ("Partitioned Zone") > Arabian Gulf > Arabian Basin > Arabian Gulf Basin > Safaniya Field (0.99)
- (23 more...)
Imaging solution to the seismic disturbed zones of the South Fuwaris oil field
Johnson, Greg M. (WesternGeco) | Riseman, Seth (WesternGeco) | Hootman, Bruce (WesternGeco) | Suren, Daniel (WesternGeco) | Dangle, David (WesternGeco) | Zhang, Kai (Chevron) | Ghose, Sujoy (Saudi Arabian Chevron) | Noguera, Victor (Saudi Arabian Chevron) | Thakur, Ram (Wafra Joint Operations) | Chakraborty, Kalyan (Wafra Joint Operations) | Al Mutairi, Ahmad (Kuwait Gulf Oil Co.) | Akram, Syed (Kuwait Gulf Oil Co.)
ABSTRACT The South Fuwaris field, located in the Partitioned Zone (PZ) between Kuwait and Saudi Arabia, is an anticlinal structure developed along the north-south trending Kuwait arch that straddles the giant Burgan and Wafra oil fields. (Figure 1). Although the structural style of this field is a relatively simple longitudinal anticline cut by normal faults (Carman 1996), there are areas of near-surface geologic complexity that result in severely distorting the existing surface seismic data. These seismically disturbed zones present an enormous challenge for the processing geophysicist whose goal is to image through them, thereby improving the reservoir description process and field development optimization. Herein, we present a consolidated workflow that goes a long way toward solving the imaging challenge within the PZ seismically disturbed zones. Presentation Date: Wednesday, October 17, 2018 Start Time: 8:30:00 AM Location: 208A (Anaheim Convention Center) Presentation Type: Oral
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (1.00)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.31)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- (13 more...)
Integrated Multiwell Approach for Heterogeneity Mapping and Production Optimization: A Case Study from Ratawi Formation of South Fuwaris Field, Partitioned Zone between Kuwait and Saudi Arabia
Al-Dwaish, Majed (Chevron) | Al-Azmi, Fahad Marrot (Chevron) | Al-Houli, Meshari (Kuwait Gulf Oil Company) | Alrubaiyea, Jamal (Kuwait Gulf Oil Company) | Al-Harbi, Musaad (Chevron) | Al-Najim, Abdulaziz (Chevron) | Sikdar, Koushik (Schlumberger) | Al-Jamaan, Abdullah (Schlumberger) | Lahmar, Hakima Ali (Schlumberger) | Bora, Kasturi (Schlumberger) | Chakraborty, Pallav (Schlumberger) | Roy, Dipanka B (Schlumberger) | Goswami, Rishav (Schlumberger)
Abstract The Ratawi Formation is one of the well-known hydrocarbon bearing reservoir in many parts of the Middle East. South Fuwaris Field in Partitioned Zone between Kuwait and Saudi Arabia is one of the examples where Ratawi is the main pay. This reservoir has shown immense potential in-terms of production from different parts of this field. However, sharp water cut increase in some of the wells has challenged the existing understanding of heterogeneity distribution in the field. An integrated approach was applied to characterize the secondary porosity using the high resolution image logs, core data and open-hole logs. A workflow was developed to map the heterogeneity in the field and calibrate it with the available production data. The Ratawi Formation was deposited in a ramp, platform setting. It is broadly divided into an upper Ratawi Shale Member and a lower Ratawi Limestone & Ratawi Oolite Member. Major discoveries were made in the lower part of the Limestone Member and Ratawi Oolite at nearby Wafra Field in 1953. Since then, major efforts have been given to understand and map the complex porosity and permeability in the field in order to sustain the production. Though at places, presence of open fracture has been reported from the image logs, however multi-well study reveals no major impact of fractures on production. An innovative approach was implemented to extract the secondary or macro porosity formed due to leaching, using high resolution image data. Initially total porosity was estimated using high resolution borehole image log and subsequently a cut off was used to segregate the secondary porosity. The permeability was then derived from macro porosity using a complex transform. Core derived total porosity and permeability shows excellent match with the image log derived results. A geostatistical approach was applied through the static model building process to generate property maps using secondary porosity, effective porosity and derived permeability logs. A Clear degradation of reservoir property has been observed towards the NNW and SSE part of the field as it lies on the flank of the gentle anticlinal structure. Available production data validates the production rate is controlled by secondary porosity in Ratawi Oolite Formation. New wells drilled based on the property maps shows promising production results from Ratawi Oolite Formation. Single porosity geo modeling using the conventional open-hole logs has always been the first approach adopted by the industry. However, in mature carbonate reservoirs, well wise production always brings surprises. A novel approach was adopted to quantify the secondary porosity from the borehole image log which was further calibrated with the core data. Permeability was also calculated considering the secondary porosity as one of the key controller. Production data shows excellent match with the secondary porosity and permeability derived 2D maps; which has bolstered the confidence of releasing new well locations with better productivity.
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (0.91)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (0.91)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.67)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.47)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Limestone (0.46)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.90)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (41 more...)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring (1.00)
The Future Impact of a Hydraulic Fracturing Pilot Project on the Completion Strategy in South- Fuwaris Field
Al-Rubaiyea, Jamal (Kuwait Gulf Oil Company) | Al-Najim, Abdulaziz (Saudi Arabian Chevron) | Al-Harbi, Musaad Sulaiman (Saudi Arabian Chevron) | Al-Dwaish, Majed (Saudi Arabian Chevron) | Sanyal, Sayantan (Kuwait Gulf Oil Company)
Abstract The South Fuwaris field comprises of low to moderately permeable heterogeneous carbonate reservoirs, developed with horizontal bare-foot completions with increased pay-zone exposure. Hydraulic Fracturing conducted in tangent section of the production liner for a horizontal open-hole producer is shaping the development strategy for this field where conventional coiled-tubing matrix stimulations couldn't achieve the intended wormhole penetration due to inherent pumping rate limitations, and borehole enlargements had rendered Acid fracturing in open-hole only moderately successful. The inability to attain effective pressure containment necessary for formation breakdown had resulted in unsuccessful open-hole Acid fracture treatments in this field for both existing and newly drilled wells, either due to non-uniform bore-hole enlargement left-over by formation dissolution from previous matrix stimulations, or due to undulations and wash-outs in newly drilled laterals. To circumvent these operational limitations, the candidate well was drilled as a barefoot completion in the direction of minimum horizontal stress with an extended production liner to accommodate a cased-hole Acid Fracture treatment with transverse fracture orientation designed to drain a large section of the reservoir. Well testing was distributed into phases to interpret the production enhancement from this completion technique, to quantify contribution from the open-hole lateral after initial completion, from the isolated uppermost fractured interval immediately after the Acid Fracture treatment and the subsequent commingled production from both the open-hole lateral and the cased-hole fractured intervals. The key elements that led to the success of this project were the execution of well placement perpendicular to the fracture plane orientation as expected from local stress distribution, achieving an effective cement bond in the horizontal production liner and an advanced fiber based Acid-Fracturing stimulation designed to deliver deeper and infinitely conductive fractures. Evaluated in terms of operational cost savings and efficiency of the treatment execution, the treatment strategy is a major improvement over the conventional multi-stage assemblies previously employed for fracturing open-hole horizontal laterals in the South Fuwaris field. The job design eliminated the use of any complex permanent down-hole assembly for the fracturing treatment which means there isn't any reduction in the cross sectional area and hence no additional pressure drop imposed by flow restrictions and also a complete bore-hole access is available for future open-hole matrix stimulations or other interventions. The objective was to evaluate the existing completion strategy in South Fuwaris field for horizontal wells; to challenge the current ideology focused entirely on performance of long open-hole single or multilaterals, and focus more on reservoir development by way of fractures initiated entirely from the cased-hole horizontal section. The project's success has opened pathways to further explore in this direction to establish the optimum completion design for thin and tight heterogeneous carbonate formations like South Fuwaris.
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (1.00)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (1.00)
- Geology > Geological Subdiscipline > Geomechanics (0.67)
- Geology > Rock Type (0.46)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
Abstract Horizontal oil and gas wells with low permeability might not be economic without multistage fracturing. Nevertheless, heavy oil horizontal wells instigate the additional problems of low mobility and low oil gravity. In these heavy oil prospects, multistage fracturing can increase the reservoir contact tremendously but the viscous nature of oil flowing within the matrix and through fractures may pose a challenge to the economical success of the fracturing treatments. The objective of this paper is to study multistage fracturing performance in heavy oil horizontal wells across carbonate reservoirs. A sector model was extracted from a full field reservoir model and was then equipped with Local Grid Refinement (LGR) mesh to accurately predict the performance of multiple transverse fractures. The model was used to study the effect of several design parameters on the performance of the horizontal well. Special consideration was given to PVT data. The output of the refined simulation sector LGR model was compared with available analytical and numerical models for multistage fracturing performance predication. Finally, the resulting optimal fracturing strategy was evaluated using the full field simulation model. This work presents an analysis and history match of actual multistage acid fracturing treatment in heavy oil field. Results of the model were important for the heavy oil field development and well placement and completion strategies.
- Asia > Middle East > Saudi Arabia (0.47)
- North America > United States > Texas (0.46)
An Innovative Approach to Formation Evaluation with a Sourceless LWD Technology for the First Time in Joint Operations, A Case Study From Partitioned Zone Between Kuwait and Saudi Arabia
Al-Rubaiyea, Jamal (Kuwait Gulf Oil Company) | Al-Bader, Ahmad (Kuwait Gulf Oil Company) | Al-Houli, Meshari (Kuwait Gulf Oil Company) | Al-Najim, Abdul-aziz (Saudi Arabian Chevron) | Al-Duwaish, Majed (Saudi Arabian Chevron) | Elsherif, Ahmed (Schlumberger)
Abstract The South Fuwaris Field is located in the Partitioned Zone between Kuwait and Saudi Arabia. The Lower Cretaceous Ratawi reservoirs were discovered in 1961, and production commenced in 1963. There are two major reservoirs – the Ratawi Limestone, which is predominantly developed by vertical wells, and the Ratawi Oolite, which is exclusively developed by horizontal wells. The reservoirs comprise low-moderate permeability limestone. The use of Logging While Drilling (LWD) tools which utilise natural radioactive sources has been always risky since losing radioactive source will necessitates a complex procedure to abandon side track the hole. Recently, a new LWD logging technique that incorporates Pulsed Neutron Generators (PNG) was introduced to Wafra Joint Operations (WJO). This new technique acts generates multiple measurements (Resistivity / Density / Neutron / Sigma / Spectroscopy). The PNG uses electrical power generated from the measurement-while-drilling (MWD) turbine to generate a large cloud of fast neutrons. These fast neutrons interact with the formation atoms to generate formation hydrogen index, sigma, and spectroscopy data. In addition, the fast neutron interactions generate a secondary gamma ray cloud that can be used to measure formation density (similar to standard density measurement). This innovative technique was used for for Wafra Joint Operations in the South Fuwaris Field, with great success. The tool was run in a pilot hole with an inclination of 60°, cutting the Ratawi Limestone and Ratawi Oolite reservoirs. The acquired data were of excellent quality in comparison with conventional LWD data. The formation sigma was used in the water saturation calculations. Spectroscopy analysis was also recorded and used for formation evaluation, especially for clay content. Finally, the new technique has been proven as a good risk mitigation / elimination for future operations.
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (0.45)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (0.45)
- Europe > Norway > Norwegian Sea > Åre Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- (15 more...)
Abstract Sabriya Mauddud original development plan was based on an inverted 9 spot pattern to produce oil from multi carbonate reservoir layers. Recently, Kuwait Oil Company (KOC) implemented a paradigm shift to an intensive campaign for drilling horizontal wells in the Mauddud Formation in North Kuwait. The lateral section extended for a long interval penetrating different facies of the Maudud carbonate reservoir. The need for advanced formation evaluation was highlighted as critical where the complex pore structure will play a big role in fluid mobility. Formation mobility in carbonate reservoirs has been always a challenge in any formation evaluation. The Sabriya Mauddud Formation is a ramp system, ranging from shallow restricted and barrier shoal / rudist buildup to outer ramp sedimentation. Mauddud carbonate is divided into two parts, a lower (Maj-MaG/F), belongs to outer to middle ramp dominated with intermittent influxes of Burgan delta shoreface sandstone sediments. The upper Mauddud (MaF to MaA) is inner ramp, barrier shoal / rudist build up and shallow restricted Packstone / Grainstone facies. The best reservoir quality is in the inner / middle ramp and barrier shoal / rudist build-up facies of MaE, MaD, MaC and MaB. The current strategy in Mauddud development plans is to produce high (MaB/MaC) and inject low (MaE/MaD). The LWD resistivity was used in this field to measure resistivity (Laterolog type) to calculate water saturation. In addition, due to the fact that LWD tools measure while rotating, several resistivity images with different depths of investigation were also available in real time and recorded mode. In this case, the LWD resistivity imaging was used to study azimuthal formation porosity distribution in order to quantify the different porosity portions (Primary / Secondary). Following that, an empirical equation was used to determine formation permeability profile. This qualitative profile is calibrated to the formation pressure / mobility with high vertical resolution to enhance permeability calculations compared to derived permeability from standard open-hole logs. Facies determination were obtained based on porosity spectrum, amount of secondary porosity combined with relevant logging results using neural network technique. This is significant to optimize well placement in the best reservoir rock types (grainstones, rudist build up and packstones). This has been proved as successful technique for horizontal well ICD completion compartmentalization design.
- Asia > Middle East > Kuwait > Jahra Governorate (0.41)
- Asia > Middle East > Qatar > Arabian Gulf (0.40)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment > Shallow Water Marine Environment (0.65)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.47)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Khuff Formation (0.99)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone > Arabian Basin > Widyan Basin > South Fuwaris Field > Pre-Khuff Formation (0.99)
- (8 more...)
Establishing Mobility Profile in a Carbonate Reservoir Using LWD Imaging Technology, A Case Study From Partitioned Zone Between Kuwait and Saudi Arabia
Al-Rubaiyea, Jamal (Kuwait Gulf Oil Company) | Al-Houli, Meshari (Kuwait Gulf Oil Company) | Al-Ajmi, Fahad (Kuwait Gulf Oil Company) | Al-Duwaish, Majed (Saudi Arabian Chevron) | Elsherif, Ahmed (Schlumberger) | Lahmar, Hakima (Schlumberger)
Abstract Over the last several years, the ability to perform accurate quantitative formation evaluation in high angle and horizontal wells has been recognized as high priority for major operators. The Logging While Drilling (LWD) has witnessed a revolution in technology in recent years. These new LWD tools have gained recognition in geosteering and well placement operations. The need for advanced formation evaluation is more critical for carbonate reservoir where the complex pore structure will play a big role in fluid mobility. Formation mobility in carbonate reservoirs has been always an important output of any formation evaluation. The South Fuwaris Field is located in the Partitioned Zone between Kuwait and Saudi Arabia. The Lower Cretaceous Ratawi reservoirs were discovered in 1961, and production commenced in 1963. There are two major reservoirs – the Ratawi Limestone, which is predominantly developed by vertical wells, and the Ratawi Oolite, which is exclusively developed by horizontal wells. The reservoirs comprise low-moderate permeability limestone. Interpretation is complicated by the existence of microporosity, mesoporosity and macroporosity. Understanding of pore type distribution would be of value is the placement of future Ratawi Oolite horizontal wells. The LWD resistivity was used in this field as standard resistivity tool (Laterolog type) to determine the true formation resistivity. In addition, due to the fact that LWD tools measure while rotating, several resistivity images with different depth of investigation are also available in real time and recorded mode. In this case, the LWD resistivity imaging was used to study azimuthal formation porosity distribution in order to quantify the different porosity portions (Primary / Secondary). Following that, an empirical equation was used to determine formation permeability profile. This profile can be further improved when calibrated with core data or formation pressure survey while drilling.
- Asia > Middle East > Saudi Arabia > Saudi Arabia - Kuwait Neutral Zone (0.26)
- Asia > Middle East > Kuwait > Saudi Arabia - Kuwait Neutral Zone (0.26)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.47)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (38 more...)
- Well Drilling > Drilling Measurement, Data Acquisition and Automation > Logging while drilling (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)