应用压降叠加原理指导高渗透油藏注采调配-《复杂油气藏》

文章信息/Info

Title:: Applying dropout superposition to injection and production allocation for high permeability reservoir

Author(s):: Sheng Jie; Yuan Qixiang; Xie Shaomin; Lin Mingjie; Chunliang Oil Production Plant of Shengli Oilfield Company,SINOPEC,Boxing,Shandong 256504

Keywords:: ultra-high permeability reservoir; high water cut; injection and production allocation; dropout superposition; effective cycle

摘要:: 梁家楼油田的纯47块、纯56块,开发层系沙三中,储层为顶平底凸的单一大厚层,平均油层厚度18.6m,平均空气渗透率2.084μm²,为特高渗透油藏。经过30多年的注水开发,已进入特高含水开发阶段,稳产的主要手段之一是通过注足水、注好水来实现稳液稳油和控水稳油。为解决该类油藏注水见效敏感、注采调配理论依据不足的问题,以油藏渗流力学为理论基础,经过深入研究、反复论证,选择压降叠加原理作为注采调配的理论依据。通过对油藏地层参数重新取值及论证,得到了适用于该油藏的压降叠加公式,进一步推导出注采调配见效周期的计算公式。运用所得公式指导注采调配,取得了较好的效果,达到了降低自然递减率、改善油藏水驱状况的目的,增加可采储量20.8×10⁴t。

Abstract:: Liangjialou Oilfield X47 and X56 blocks, the developing Sha3 layer, is a thick flat top- bottom convex reservoir, with average reservoir thickness of 18.6 meters,and average air permeability of 2.084μm².It is an ultra-high permeability reservoir. After 30 years'waterflooding, it has entered a very high water cut phase. The production has been stable by water injection effectively.In recent years, to solve many problems,such as sensitive reservoir to waterflood,lack of theoretical basis for injection-production adjustment,reservoir seepage mechanics as theoretical foundation, after study and demonstration, the pressure drop superposition is selected as a theoretical basis for injection and production adjustment.Through taking formation parameters again and repeated appraisals, the reservoir pressure drop superposition formula is gained to derive injection-production cycle formula for calculating the results. Applying the formula to guide the injection-production deployment, good results have been achieved to reduce the natural decline rates,to improve reservoir water flooding,and to increase the recoverable reserve of 20.8×10⁴t.