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• W4230677673 abstract "Practical Experiences of Improvement Oil Recovery for Weizhou 11-4 Bottom Water Oilfield in South China Sea Hongyin Zheng; Hongyin Zheng CNOOC Research Center Search for other works by this author on: This Site Google Scholar Pengxiao Sun Pengxiao Sun CNOOC Research Center Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, Melbourne, Australia, October 2002. Paper Number: SPE-77836-MS https://doi.org/10.2118/77836-MS Published: October 08 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Zheng, Hongyin, and Pengxiao Sun. Practical Experiences of Improvement Oil Recovery for Weizhou 11-4 Bottom Water Oilfield in South China Sea. Paper presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, Melbourne, Australia, October 2002. doi: https://doi.org/10.2118/77836-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Asia Pacific Oil and Gas Conference and Exhibition Search Advanced Search AbstractThe Weizhou 11–4 oilfield is located in the North Gulf Basin of South China Sea. This oilfield is the massive sandstone reservoir of marine sedimental formation with strong bottom water drive. Its structure is a simple and complete drape anticline without faults. The reservoir geological properties are fairly good. The average porosity is 22%, and the average permeability is 945md. The thickness of sand body is from 30m to 50m. There is a stable distribution of the tight sandstone layer to be developed just above the oil-water contact in the entire oil-bearing area.During the oil producing period, the operator had emphasized on the combination research of fine reservoir description and reservoir simulation. So the production performance of the oilfield was improved significantly. The original oil in place (OOIP) has been greatly increased from ODP's 1817×104 m3 to updated 2550×104 m3 by the integrated reservoir characterization. The incremental OOIP is about 733×104 m3. By the end of 2001, the cumulative oil production is up to 824.47×104 m3 of which it is about 32.3% OOIP and water-cut is about 71.1%. According to the results newly forecasted, the ultimate cumulative oil production can be up to 1096×104 m3. The 725×104 m3 of incremental oil recoverable reserves has been enhanced than ODP's 371×104 m3, and its oil recovery factor has been improved from ODP's 20.4% OOIP to more than 42.98% OOIP.Based on more than eight years producing experience of this oilfield, although it is marginal originally, great development effects and economic benefits have been achieved by using effective stimulation measures, such as drilling multilateral or single horizontal sidetrack wells, drilling additional wells, enlarging draw down pressure, enhancing the liquid production rate especially in the middle water cut period. All these stimulation measures have effectively increased the sweep efficiency, extended the period of production plateau, ensured the average yearly oil production to be more than 4% OOIP lasting out eight years, and also improved the oil recovery. This paper, from the point of view of oil field development and reservoir management, presents the main development strategy and technical experience of this oilfield based on its general situation, geological characteristics and production performance.IntroductionThe Weizhou 11–4 oilfield is located in the low relief of the south of Weixinan Depression in North Gulf Basin in South China Sea. The water depth is 42.8 m in the oilfield area. The operator is CNOOC.The Weizhou 11–4 oilfield is the massive sandstone reservoirs with strong bottom water drive. Its structure is a simple and complete drape anticline, and there is no fault founded. From top to down, there are three reservoirs in this oilfield, namely the Reservoir I, Reservoir II and Reservoir III. All of them are marine sedimental formation. The reservoir geological properties are fairly good. The average porosity is 22%, and the average permeability is 945 md. The thickness of sand body is from 30 m to 50 m, it becomes thinner from center part to flank, and from the west to east. There is a stable distribution of the tight sandstone layer to be developed just above the oil-water contact in the entire oil-bearing area. The main producing reservoir is the Reservoir II. The oil-bearing area of the oilfield is 14.2 km2 and the original oil in place is 2550×104 m3.The Weizhou 11–4 oilfield has been put into production in Sept. 1993. The three reservoirs in this oilfield have been developed by one set of well pattern. Currently, there are 3 production platforms and 33 production wells in this oilfield, of which one well is producing in the Reservoir I, and 32 wells are producing in the Reservoir II. The Reservoir III is served as a production replacement layer and potential stimulation candidate. All of these production wells are of perforation completion and producing by ESP, and because of the unconsolidated cementation, sand screen and gravel packing completion are used to avoid the sand production. Keywords: reservoir surveillance, thickness, oil recovery factor, production performance, oil recovery, reservoir ii, cumulative oil production, reservoir characterization, oil production rate, liquid production Subjects: Well & Reservoir Surveillance and Monitoring, Reservoir Characterization This content is only available via PDF. 2002. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4230677673 title "Practical Experiences of Improvement Oil Recovery for Weizhou 11-4 Bottom Water Oilfield in South China Sea" @default.
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