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Tataouine Governorate
Efficiency and Innovation for Borehole Seismic Acquisition in a Well Completed with Permanent Fiber: DAS Technology for Saving Time and Minimizing Risk
Ferla, Maurizio (Eni) | Miranda, Francesco (Eni) | Nutricato, Giacomo (Eni) | Galli, Giuseppe (Eni) | Moriggi, Sara (Eni) | Malossi, Alfio (Eni) | Guglielmo, Carmelo (Eni) | Tesconi, Marcello (Eni) | Mangione, Alessandro (Eni) | Stocchi, Donatella (Eni) | Naouar, Aymen (Eni) | Bettinelli, Pierre (Schlumberger) | Manai, Nabil (Schlumberger) | Slail, Osama (Schlumberger) | Pagnin, Andrea (Schlumberger)
Abstract Efficiency is a key factor on any operation. In this paper, we introduce the heterodyne Distributed Vibration Sensing (hDVS), which is an innovative technology based on fiber optic system to improve the duration of borehole seismic operations. We designed a survey aimed at comparing standard downhole geophone accelerometers measurements to i) optical fiber seismic installed inside the hybrid Wireline cable and ii) optical fiber clamped permanently to the well completion tubing. This comparison was conducted using a standard rig source VSP in association to advanced Offsets VSP. The purpose of the study was to evaluate this innovative technology and to assess the feasibility of drastic operation time reduction without compromising output data quality. To better evaluate the readiness of the technology, we decided to compare three distinct types of downhole measurements and designed a specific advanced acquisition which allowed us to compare various configurations. Consequently, the borehole seismic acquisition performed in the MR-SE1 well located in Makhrouga field (Tunisia) was split into two phases. Phase #1: during open-hole Wireline logging, using the standard downhole geophone accelerometers (VSI) and fiber optic seismic cable (single-mode cable) installed inside the Wireline logging cable (called hybrid Wireline cable). Phase #2: at the departure of the drilling rig, using a fiber optic seismic cable (single-mode cable) installed permanently along the intelligent completion. The results highlight the effectiveness of the hDVS technology with a proven decrease on operation timing, with reliable and good SNR recorded data. Nowadays, efficiency is a key requirement for any data acquisition process. The heterodyne Distributed Vibration Sensing (hDVS) is an innovative technology designed to achieve such effectiveness by making the Vertical Seismic Profile (VSP) a matter of minutes instead of hours, as using standard downhole equipment, without compromising output data reliability and allowing the measurements repeatability (no well interventions required). Finally, based on the quality of the dataset acquired, further analysis can be conducted for imaging purpose by analyzing the reflected waveforms, which could bring additional information and could change the way we are operating.
acquisition, borehole imaging, borehole seismic acquisition, cable, downhole geophone accelerometer, fiber optic cable, fiber optic seismic cable, frequency, geophone accelerometer, geophone accelerometer measurement, hdv technology, hybrid wireline cable, innovative technology, log analysis, production control, production monitoring, Reservoir Characterization, Reservoir Surveillance, rig source VSP, standard geophone accelerometer, Upstream Oil & Gas, vertical seismic profile, vibration sensing, Vibroseis, well logging, wellbore seismic
Geophysics: Geophysics > Seismic Surveying > Borehole Seismic Surveying > Vertical Seismic Profile (VSP) (1.00)
Oilfield Places:
- Africa > Middle East > Tunisia > Tataouine Governorate > MLD Concession > Permis du Sud > Makhrouga Field > Tagi Formation (0.99)
- Africa > Middle East > Tunisia > Tataouine Governorate > MLD Concession > Permis du Sud > Makhrouga Field > Ordovicien Formation (0.99)
- Africa > Middle East > Tunisia > Tataouine Governorate > MLD Concession > Permis du Sud > Makhrouga Field > Acacus Formation (0.99)
- (8 more...)
SPE Disciplines:
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Near-well and vertical seismic profiles (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 > Borehole imaging and wellbore seismic (1.00)
Thermally Activated Particle Treatment to Improve Sweep Efficiency: Pilot Test Results and Field Scale Application Design in El Borma Field (Tunisia)
Galli, Giuseppe (University of Oklahoma) | Morra, Daniela (University of Oklahoma) | Ghaddab, Fethi (University of Oklahoma) | Sitep, Marcello Tesconi (University of Oklahoma) | Manrique, Eduardo (University of Oklahoma) | Tiorco, Glyn Freeman (University of Oklahoma)
Abstract El Borma is a mature oil field located onshore in the Northern Sahara Desert, Tunisia. Oil production commenced in 1966 and is currently supported by water injection; the high water cut (96%) and permeability contrast in the main reservoir (Level "A") indicated thief zones with less than optimum sweep efficiency prompting the evaluation of a tertiary method for improved oil recovery. In January of 2010 a pilot project (injector-producer) was implemented to evaluate a thermally activated particle (TAP) system as a strategy to improve the sweep efficiency of ongoing water injection program. This paper will summarize TAP pilot implementation and will describe methodology and results of project monitoring and injection-production performance. The evident good results of this TAP application (decrease in water cut with consequent increase in oil recovery up to 55%) in the last fourteen months justified a larger scale application in the field. The field scale application design was performed in two different steps: 1) Comprehensive production-injection data analysis of injectors based on the number of connected (offset) producers and channel volume estimations and; 2) The numerical simulation studies of most promising patterns calibrated with information generated during the first TAP pilot. Screening of patterns candidates and simulation approach of TAP will be also presented. El Borma pilot results validate the potential of TAP as an in-depth conformance strategy that can improve sweep efficiency of mature waterfloods. El Borma workflow to screen and rank patterns candidates combined with pilot project implementation, monitoring and evaluation can be used as a reference to evaluate the benefits of TAP technology in waterflooded oil reservoirs.
activation, adsorption, application, concentration, conformance improvement, enhanced recovery, field scale application design, injection, injector, Modeling & Simulation, permeability, producer, reservoir, sensitivity, spe 154042, sweep efficiency, tap application, thermally activated particle treatment, Tunisia, Upstream Oil & Gas, water cut, waterflooding
Country:
- Africa > Middle East > Tunisia > Tataouine (0.51)
- Africa > Middle East > Tunisia > Tataouine Governorate > El Borma District (0.41)
- Africa > Middle East > Algeria > Ouargla Province (0.41)
Oilfield Places:
- Africa > Middle East > Tunisia > Tataouine Governorate > El Borma District > Berkine Basin (Trias/Ghadames Basin) > El Borma Concession > El Borma Field (0.99)
- Africa > Middle East > Tunisia > Berkine Basin (Trias/Ghadames Basin) (0.99)
- Africa > Middle East > Libya > Berkine Basin (Trias/Ghadames Basin) (0.99)
- Africa > Middle East > Algeria > Berkine Basin (Trias/Ghadames Basin) (0.99)
SPE Disciplines:
Technology:
- Information Technology > Modeling & Simulation (0.35)
- Information Technology > Data Science (0.34)
Abstract The Oued Zar process is continuously progressing and growing. In fact, the exploitation of the new well reserves engendered an important increase of the quantities of oil and gas to be treated. One of the major issues associated to this evolution was to optimise the process and to consider environmental impact. The purpose of this work consists on the application of the ejector technology in real case. The ejector is a pump-like device that uses the Venturi effect of a converging-diverging nozzle. It converts the pressure energy of a driver fluid to velocity energy. A low pressure zone is created and entrains a suction fluid. After passing through the throat of the injector, the mixed fluid expands and the velocity is reduced, thus recompressing the mixed fluids by converting velocity energy back into pressure energy. ENI Tunisia had previous experience using the ejector technology in Oued Zar plant. The Ejector design is specific. It’s intended to suit an individual case requirement for maximum operating efficiency. Thus, for the conceptual phase, first step of the project, real field data (the gas outgoing of separator and the driver gas characteristics) are required. This information is obtained by CPG analyses and pressure measurement. Then, the performance of ejector is evaluated for different drive flow. The second step consists on field installation. The ejector started up in December 2006. The excellent results obtained during the test were confirmed. The ejector is still working with high performance and very low maintenance cost. This experience confirms the first field installation of ejector was successfully accomplished in the Oued Zar oilfield in 2006 and encourages using it for other similar projects.
doi: 10.2118/134956-MS
SPE-134956-MS
application, barg, compressibility factor 0, compressor, ejector, ejector performance, ejector technology, Exhibition, field installation, flow rate, installation, ksm 3, main characteristic, Multiphase Ejector, operation conference, Petroleum Engineer, production control, production monitoring, Reservoir Surveillance, separation and treating, separator pressure, SPE Production, suction pressure, Upstream Oil & Gas
Country:
- North America > United States (0.69)
- Africa > Middle East > Tunisia > Tataouine Governorate > Bin Zar District (0.25)
Oilfield Places: Africa > Middle East > Tunisia > Tataouine Governorate > Bin Zar District > Berkine Basin (Trias/Ghadames Basin) > Oued Zar Field (0.99)
ABSTRACT: A detailed description of geological heterogeneities, a good transfer to the dynamical model and the identification of the most important factors in dynamic simulation are the key-points for a reliable modelling of the reservoir behaviour. El Borma is a giant oil field in a mature stage of production through secondary recovery by water injection. About 190 wells (some of them horizontal) have been drilled; an infilling well campaign aiming at increasing the recovery and an EOR WAG pilot project have been recently started. The field is producing from 4 main reservoir levels composed of fluviatile sediments characterised by strong facies heterogeneities and crossed by some sub-seismic faults. The geological study was carried out using:*a cluster analysis process on logs *non stationary facies simulations *petrophysical simulations *a strong integration between geological data and a rich production history *an upscaling method based on VPC and Laplace algorithm Dynamic modelling after the ranking of upscaled geostatistical images confirmed the good reservoir description with good matches since the first runs. After the fine tuning phase the static model was substantially unchanged. Moreover, good results in the final match were also determined by the identification and simulation of some phenomena like gas relative permeability hysteresis and water injection characterisation. Gas relative permeability hysteresis enabled us to match the strong reservoir depletion in the first phase of field production and, at the same time, assured a GOR control after water injection activation. In a mature field with high water-cut (85-98%), little and generally acceptable differences in water-cut match have a dramatic influence on pressure evolution. Therefore, a detailed description of water characteristics (injection vs formation water) is mandatory.
dynamic reservoir characteristic, el borma field, end point, enhanced recovery, flow in porous media, Fluid Dynamics, formation water, geostatistical model, heterogeneity, History Match, hysteresis, identification, injection water, permeability, production history, realisation, Reservoir Characterization, reservoir simulation, Saturation Curve, sequence, Upstream Oil & Gas, variation, water injection
Country:
- Africa > Middle East > Tunisia > Tataouine Governorate > El Borma District (0.42)
- Africa > Middle East > Algeria > Ouargla Province (0.42)
Oilfield Places: Africa > Middle East > Tunisia > Tataouine Governorate > El Borma District > Berkine Basin (Trias/Ghadames Basin) > El Borma Concession > El Borma Field (0.99)
SPE Disciplines:
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