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Results
Cost-Effective Development Mode for Marginal Oil fields – Best Practice of CNPC
Wu, Bohong (Research Institute of Petroleum Exploration & Development, PetroChina) | Nie, Zhen (Research Institute of Petroleum Exploration & Development, PetroChina) | Li, Yong (Research Institute of Petroleum Exploration & Development, PetroChina) | Deng, Xili (Research Institute of Petroleum Exploration & Development, PetroChina) | Ma, Ruicheng (Research Institute of Petroleum Exploration & Development, PetroChina) | Xu, Jiacheng (Research Institute of Petroleum Exploration & Development, PetroChina)
Abstract Marginal reserves are an important play in future energy development. Based on the statistics of China National Petroleum Corporation (CNPC), the low permeability and unconventional reservoirs occupied 92% of newly found proven reserves in China. To overcome challenges such as poor reservoir conditions, weak natural energy, low displacement efficiency, and insufficient single well production, CNPC has conducted years of research and operation to cost-effectively develop China's marginal reserves. To develop the marginal fields economically, it is required to maximize single well production, recovery and reservoir sweep with minimum CAPEX and OPEX reasonably. The production enhancement is realized by 3 key technologies, namely, sweet spot identification, multi-layered 3D short spacing horizontal well pattern, and volumetric fracturing techniques. The cost reduction is achieved by the full life cycle practice of utilizing "large cluster, factory" well design and field operation, drilling prognosis optimization, integrated intelligent surface system, and unmanned operation. CNPC cost-effective development mode is practical and successful, marginal fields characterized with heterogeneous, multi-layered oil-bearing intervals with poor continuity are being economically developed in China. By comprehensive geological study, fit-for-purpose technologies application, and geoscience-to-engineering integration, the fracture control degree of horizontal wells increased from 60% to more than 90% based on micro-seismic events, stimulated reservoir volume (SRV) increased by 46.8%, average cumulative oil production per well is more than 100 times than original production in the field. Fast and early cash flow is realized by minimum production facilities. The average drilling cycle is shortened by 61%, the surface facility construction time is reduced by 65%, and the average single well investment is reduced by 42%.
- Asia > China (1.00)
- North America > United States > Texas (0.47)
- Government > Regional Government > Asia Government > China Government (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery (1.00)
- (4 more...)
Success in Complex Channel Sand Reservoir Development Driven by New Generation of Ultra-High-Definition Multilayer Mapping-While-Drilling Service and Hybrid Rotary Steerable System
Yang, Bin (Sinopec Sheng Li Ocean) | Li, Tong (SLB) | Wang, Fei (SLB) | Wang, Feng Hai (SLB) | Li, Shu Zhong (SLB) | Wu, Kai (SLB) | Hu, Zhong (SLB) | Wang, Li (SLB) | Chen, Yao (SLB) | Liu, Qi Xun (SLB) | Zhang, Yan Xing (SLB) | Maalouf, Janine (SLB)
Abstract Accurate real-time characterization of complex channel sand reservoir is very critical for horizontal well drilling and production improvement. CB block located in the southwest part of Bohai Bay which is the main offshore block for SINOPEC Sheng Li. This block is featured by braided river and fluvial deposition environment. The operator faced challenges during horizontal drilling, such as thin sand channels, inner-beds development, severe lateral change, unstable sand structure and low sand connectivity. A horizontal well drilling campaign was launched in 2021. Through considerable data assessment and feasibility study, the new generation of Ultra-High-Definition multilayer mapping-while-drilling service and rotary steerable system (RSS) as an integrated solution package was deployed to this project to overcome above challenges. Without any a-priori assumptions, the new generation service doubles depth of detection (DOD) range compared with previous bed-boundary detection services, delivers clearer boundary delineation, and is capable of remotely identifying the quantitative subsurface features, including layers’ numbers, resistivity and anisotropy distribution, thickness, and dip etc. Meanwhile, the truly hybrid RSS with near bit measurements ensures accurate and smooth trajectory control and reduces the drilling risk in the soft formation. The pilot project was successfully completed. With the help from real-time measurements combined with seismic data, and by utilizing the advanced inversion advantage, this technology could depict whole individual sand bodies and their mutual lateral contact relationship clearly, which not only can optimize the reservoir exposure rate but also provide a better way for detailed reservoir characterization. Four wells were geosteered for a total of1026m with 96.1% reservoir exposure rate. Primary production from these 4 horizontal wells exceeded the expected production by 40% with only 10% water cut. This innovative solution demonstrates its advantage on optimizing a complex channel sand drilling and development. The authors believe that the fit-for-purpose solution could be expanded to other similar projects by showcasing the distinctive case studies in this paper.
- Asia > China (1.00)
- Asia > Middle East (0.94)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.71)
- Geology > Sedimentary Geology > Depositional Environment > Continental Environment > Fluvial Environment (0.49)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying (0.89)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.35)
- Asia > China > Shandong > North China Basin > Shengli Field (0.99)
- Asia > China > Bohai Bay > Bohai Basin > Huanghua Basin > Chengdao Field (0.99)
- Asia > China > Bohai Basin (0.99)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Drilling > Drilling Equipment > Directional drilling systems and equipment (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery (1.00)
A Systematic Approach to Simulation Hydraulic Fracture Propagation by Implementing Natural Fracture Modeling in Unconventional Reservoir
Qu, Jianhua (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd) | Zhang, Boning (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd) | Deng, Qi (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd) | Luo, Bo (Department of Petroleum Engineering, University of Houston) | Xue, Heng (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd) | Huang, Jing (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd) | Huang, Xingning (Baker Hughes) | Guo, Songyi (Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd. / China Zhenhua Oil Co.Ltd)
Abstract Junggar Basin is a typical superimposed oil and gas bearing basin in western China, where Mahu Depression is the largest oil-gas accumulation zone and exploration area. On April 23rd, 2013, the peak daily oil production of Mahu No.1 well reached 52 tons, achieving a significant breakthrough. On August 23rd of the same year, the high yield of Mahu No.18 well opened a new chapter of oil and gas exploration in the slope belt of the Mahu Depression. Since then, CNPC (China National Petroleum Corporation) has increased the exploration and development process of the Mahu Depression, establishing the exploration theory and technology system of the conglomerate reservoir in the depression area. Finally, the exploration and discovery of a supergiant conglomerate oil field (1 billion tons) were achieved. However, a series of development problems were exposed, which was due to the lack of in-depth research on reservoir geomechanics and distribution law for natural fractures: 1) The Hydraulic fracture propagation law is not clear; 2) In the process of fracturing, there exists an obvious phenomenon of non-uniform fluid inflow and expansion in various clusters of fractures; 3) Serious interference occurs between wells during the fracturing operation. Therefore, it is necessary to strengthen the study of geomechanics and distribution law for natural fractures in unconventional oil reservoirs, so as to provide technical support for the optimization of the horizontal well fracturing scheme, improvement of well pattern deployment parameters, and adjustment of oil reservoir development scheme, which further leads to cost reduction and development efficiency improvement while increasing single well production in unconventional oil reservoirs.
- Asia > China > Xinjiang Uyghur Autonomous Region (0.35)
- North America > United States > Texas (0.28)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.97)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.76)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.68)
- Asia > China > Xinjiang Uyghur Autonomous Region > Junggar Basin > Karamay Field (0.99)
- Asia > China > Northeast China > Songliao Basin > Shahezi Formation (0.99)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.97)
- (24 more...)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- (2 more...)
The Study on 3D Geomechanical Modeling Improves Horizontal Well Drilling Performance: A Case Study from Junggar Basin, China
Yang, Zhidong (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Zhao, Xubin (Development Corporation of Xinjiang Oilfield Company, CNPC) | Huang, Liang (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Deng, Jiasheng (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Zhou, Wei (Research Institute Exploration & Development of PetroChina, CNPC) | Ding, Shen (Engineering Technology Division of Xinjiang Oilfield Company, CNPC) | Lian, Liming (Research Institute Exploration & Development of PetroChina, CNPC) | He, Wangda (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Yu, Hao (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Xie, Peng (Bai Kou Quan Oil Plant of Xinjiang Oilfield Company, CNPC) | Yang, Xiao (Beijing Sirek Energy Technology Co., Ltd)
Abstract Recently, the development of tight oil reservoirs of PetroChina is mainly in the stage of large-scale production. Among them, hydraulic fracturing technology of horizontal well is a relatively very effective way to realize the economic development of unconventional oil and gas resources. The lack of systematic analysis and research on the overpressure mechanism of unconventional resources and the characteristics of wellbore stability has led to frequent occurrences of drilling accidents such as practical lost circulation, inflows, pack off and connection gas in horizontal well drilling operation. This greatly restricts the development and production of unconventional resources. In addition, the instability of the wellbore can easily lead to serious drilling complex accidents and greatly increase drilling costs. Among them, the geomechanical evaluation method is the focus of optimizing the drilling schemes. And accurate geomechanical models can provide technical support for drilling. On this basis, according to its reasonable optimization process measures to control potential drilling risks. Although the improvement and perfection of the evaluation method of geomechanical characteristics is a major focus of optimizing the drilling plan. However, one-dimensional geomechanics is often limited to the study of stress characteristics around the wellbore. As a result, it can't accurately characterize the distribution of its stress characteristics in three-dimensional space. Furthermore, the spatial overpressure distribution law is clarified, and the integrated research can carry out pre-drilling early warning, actual drilling tracking and post-drilling evaluation of horizontal wellbore stability. According to its research results, reasonable optimization of process measures to control potential drilling risks. Based on geomechanical research to optimize mud weight, thereby improving wellbore stability, and reducing the risks of drilling operation. The experience and knowledge gained from the research results of this study will provide guidance and reference for the efficient development of unconventional oil and gas reservoirs in other basins as much as possible.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.48)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (0.70)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.36)
- North America > United States > California > Sacramento Basin > 2 Formation (0.99)
- Asia > China > Xinjiang Uyghur Autonomous Region > Junggar Basin (0.99)
- Asia > China > Qinghai > Qaidam Basin > Mabei Field (0.99)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
At a major industry conference in March in Beijing, Wang Yilin, the chairman of China National Petroleum Corporation (CNPC), took a moment to highlight that just outside the doors to the building were blue skies--a result, he said, of the country's move to displace coal-fired power generation with cleaner-burning natural gas. Wang praised his company's "enormous contribution" to the pleasant conditions by emphasizing CNPC's role as China's largest producer of natural gas. In doing so, he underlined how the company, the fourth largest in the world, is being reshaped by China's multifaceted energy transformation. The country depends on coal for more than half of its energy needs, while natural gas represents only 7% of the mix, an increasing amount of which is imported as liquefied natural gas (LNG). Driven by air quality concerns, the country is looking to double that gas figure by 2035. But its national energy security agenda includes reducing dependence on foreign LNG by relying on national oil companies to increase domestic supplies through the commercialization of unconventional resources.
- Asia > China > Sichuan Province (0.30)
- Asia > China > Beijing > Beijing (0.24)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.76)
- Geology > Geological Subdiscipline > Geomechanics (0.69)
- Government > Regional Government > Asia Government > China Government (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Shale gas (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- (3 more...)
At a major industry conference in March in Beijing, Wang Yilin, the chairman of China National Petroleum Corporation (CNPC), took a moment to highlight that just outside the doors to the building were blue skies--a result, he said, of the country's move to displace coal-fired power generation with cleaner-burning natural gas. Wang praised his company's "enormous contribution" to the pleasant conditions by emphasizing CNPC's role as China's largest producer of natural gas. In doing so, he underlined how the company, the fourth largest in the world, is being reshaped by China's multifaceted energy transformation. The country depends on coal for more than half of its energy needs, while natural gas represents only 7% of the mix, an increasing amount of which is imported as liquefied natural gas (LNG). Driven by air quality concerns, the country is looking to double that gas figure by 2035. But its national energy security agenda includes reducing dependence on foreign LNG by relying on national oil companies to increase domestic supplies through the commercialization of unconventional resources.
- Asia > China > Sichuan Province (0.30)
- Asia > China > Beijing > Beijing (0.24)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.76)
- Geology > Geological Subdiscipline > Geomechanics (0.69)
- Government > Regional Government > Asia Government > China Government (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Shale gas (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- (3 more...)
China's Deepwater Field Development: Subsurface Challenges and Opportunities
Li, Hangyu (China University of Petroleum, East China) | Zhang, Ming (Research Institute of Petroleum Exploration and Development, PetroChina) | Lau, Hon (National University of Singapore) | Fu, Shiwen (X'ian Petroleum University)
Abstract At present, China has three major deepwater oil and gas fields located in the Qiongdongnan and Pearl River Mouth basins in the South China Sea (SCS) at water depths ranging from 300 m to over 1500 m. In this paper we compare the geology, reservoir and fluid properties and development concepts of these deepwater fields with those in the Gulf of Mexico (GOM), Nigeria and Brazil. Based on this comparison, we have identified several key subsurface challenges and opportunities for future deepwater field developments in the SCS. Major subsurface challenges include smaller in-place volumes, heavier oil, lower reservoir energy and higher reservoir temperature. Opportunities identified include locating continental margin systems with high accommodation volumes and thick sandstone supply, use of alternative development concepts such as Floating Liquified Natural Gas (FLNG) and complaint platforms with dry tree wells and learnings from the recent development of lower-permeability reservoirs in deepwater GOM and the heavy oil deepwater developments and CO2 handling techniques in Brazil.
- Asia > China > South China Sea (1.00)
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean (0.67)
- North America > United States > Texas > Harris County > Houston (0.29)
- Phanerozoic > Cenozoic > Paleogene (1.00)
- Phanerozoic > Cenozoic > Neogene > Miocene (0.69)
- Geology > Structural Geology > Tectonics (1.00)
- Geology > Geological Subdiscipline (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment > Deep Water Marine Environment (0.94)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.89)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.69)
- Government > Regional Government > Asia Government > China Government (0.69)
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean > Santos Basin > Libra Block > Libra Field > Guaratiba Formation (0.99)
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean > Santos Basin > Block BM-S-11 > Tupi Field > Lula Formation (0.99)
- South America > Brazil > Rio de Janeiro > South Atlantic Ocean > Santos Basin > Block BM-S-11 > Tupi Field > Guaratiba Formation (0.99)
- (42 more...)
- Well Drilling > Drilling Operations > Directional drilling (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)
- (6 more...)
Arresting the Production Decline and Increasing the Ultimate Recovery of a Mature Oilfield in Offshore South China Sea
Fei, Gao Xiao (CNOOC Shenzhen) | Xu, Shen (CNOOC Shenzhen) | Ling, Dai (CNOOC Shenzhen) | Han, Shim Yen (Schlumberger) | Chao, Wang (Schlumberger) | Bei, Gao (Schlumberger) | Jun, Ding Sai (Schlumberger)
ABSTRACT A brownfield adjustment project was initiated by China National Offshore Oil Corporation (CNOOC) in 2014 to improve the production and further increase its reserve recovery from two oilfields in the South China Sea, this project is also known as the new XJ district joint development project. New development wells were drilled targeting at the remaining less than 5m thin oil column or pursuing highly heterogeneous sand bodies. The re-development and exploiting of these targets present technical and operational challenges. Not only the horizontal well needs to be optimally placed within complex target zone, the lateral also needs to be placed close to the reservoir top to keep it away from the unknown current fluid contact. Real-time evaluation of the horizontal section is needed to steer the well following better sand quality when formation properties changes laterally. Considering all the challenges presented, the team must ensure each well can achieve the target productivity index to attain technical and economic success. Multiple cases will be discussed in the paper based on 10 wells drilled since the launch of this joint development project. Several key outcomes that have been observed will be highlighted, including:Selection of logging tools to address well specific challenges Using real-time bed boundary detection technique to optimize the standoff between horizontal section and top of formation Real-time evaluation to appraise formation heterogeneity Evaluate productivity index while drilling to optimize the horizontal section length Based on the well performance result obtained from this re-development project, the implementation of the best practices in operation is the key enabler to effectively place the trajectory in the best place to drain the remaining hydrocarbon that increase ultimate recovery of a mature oilfield.
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.70)
- Geology > Geological Subdiscipline (0.69)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.69)
- North America > United States > Louisiana > China Field (0.99)
- Asia > China > South China Sea > Zhujiangkou Basin (0.99)
- North America > United States > Texas > East Gulf Coast Tertiary Basin > South China Field (0.97)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery (1.00)
- (3 more...)
Technology Focus Not too long ago, horizontal drilling revolutionized the petroleum industry. Emerging logging-while-drilling and geosteering technologies helped bring about multilateral, maximum-contact, and smart-completion wells, allowing reservoirs to be developed and produced much more efficiently and economically. This increased recovery, thus boosting reserves. In the process, formation evaluation plays a critical role in determining whether a producer or an injector is successful. More recently, efficient mass horizontal drilling and optimized multistage massive fracturing have turned traditionally nonreservoir source rock into sweet spots of energy strategy on a global scale. Production from unconventional reservoirs in the last decade has dramatically changed the petroleum industry, and this movement continues to evolve. Developing unconventional resources demands unconventional thinking, mainly because of the many challenges involved in evaluating tight source rocks. The two fundamental petrophysical properties, pore structure and wettability, are completely different between conventional reservoirs and unconventional source rocks. What may be next on the horizon? It is estimated that methane hydrates contain much more gas than shale plays, and, understandably, many countries are keen to explore this vast potential. As per recent news releases, China Geological Survey geoscientists and China National Petroleum Corporation engineers may have made a great technology breakthrough by being able to test significant hydrate-gas production in the South China Sea. If this is sustainable, exploring hydrate gas may be the next game changer for the energy industry. Evaluating hydrate gas formations would not be easy, however, and producing them safely, economically, and in an environmentally friendly way would be very challenging. But, I have high hopes that future technologies will be able to resolve these challenges to produce hydrate gas conventionally so it can be used to improve living standards. Recommended additional reading at OnePetro: www.onepetro.org. SPE 182448 The Petrophysics Role of Low-Resistivity Pay Zone of Talang Akar Formation, South Sumatera Basin, Indonesia by Z. Holis, SKK Migas, et al. SPE 183883 Using Digital Rock Modeling To Estimate Permeability and Capillary Pressure From NMR and Geochemical Logs by Hao Zhang, Baker Hughes, et al. SPE 183800 An Innovative Approach for Integrated Characterization and Modeling of a Complex Carbonate Reservoir by F. Ben Amor, Schlumberger, et al.
- Asia > China (1.00)
- Asia > Indonesia > Sumatra > South Sumatra (0.26)
- Asia > Indonesia > South Sumatra (0.26)
- (2 more...)
- Geology > Geological Subdiscipline > Geochemistry (1.00)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.69)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.35)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.80)
New Multilayer Boundary Detection Service Employing in Complex and Mature Reservoir of Bohai Bay, Northern China
Guo, Xija (CNOOC-Tianjin) | Jia, Yong (CNOOC-Tianjin) | Fan, Kai (CNOOC-Tianjin) | Yang, Liuhe (CNOOC-Tianjin) | Zhao, Guoquan (CNOOC-Tianjin) | Wu, Kai (Schlumberger) | Wang, Fei (Schlumberger) | Li, Cang (Schlumberger) | Gao, Zhujun (Schlumberger)
Abstract Bohai Bay basin, the largest offshore basin of China, is located in northern China. Its oil and gas resources are commercially operated by China National Offshore Oil Corporation (CNOOC) since 1967. From 1967 to the present, more than 100 production platforms have been put into operation in a 43,000-km exploration area, including both development projects on the greenfield and infill projects on the brownfield. The predominant depositional environment of Bohai Bay basin is a shallow delta and a meandering river system complicated by faults, which leads to fully developed interbed interference and high geological uncertainty while drilling horizontal wells within the greenfield. For the infill projects, high water cut is the primary concern, especially after long-term development. Therefore, our trajectory must be controlled precisely in a desired position to overcome the existing or potential water issue. As a solution to these challenges, a new multilayer boundary detection service has been introduced to CNOOC for the first time. Outstanding outcomes have been observed by implementing this new multilayer boundary detection service. This innovative technology was applied to two challenging wells, well A of a development project achieved 377m measured depth (MD) lateral exposure with 100% net-to-gross (NTG) while depicting whole individual sand bodies and their mutual lateral contact relationship clearly, which not only can optimize the final NTG but also supply much detail, allowing for a more robust reservoir characterization. By using this technology on both landing and lateral section drilling for Well B of the infill project, target top was identified 3m true vertical depth (TVD) in advance and landed less than 1m below the target top with very low incident angle. Precise landing and lateral placement of horizontal wells and the use of inflow control devices for completion, have become critical to the success of this campaign. The results have shown that water cut has significantly declined from an average of 46.2% to 2.1%. This considerable decline can can bring higher recovery rate to this brownfield. Even for the entire China market, this was the first time that the new multilayer boundary detection service was introduced. This paper illustrates an exemplary case study of using this innovative technology for a better understanding of reservoir characterization and higher recovery rate while performing high quality geosteering in complex and mature reservoirs.
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > Asia Government > China Government (0.76)
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Conformance improvement (0.78)