车272块增产工艺技术研究

STUDY OF STIMULATION TECHNOLOGY IN CHE272 BLOCK

东风港油田车272块油藏位于东风港油田的东南部,属于低渗、特低丰度低产能中深层储层。该块沙四上油藏受构造和岩性双重因素控制,油藏类型为岩性-构造油藏。该区断块复杂,平均渗透率为27×10-3μm2,自然产能低,天然能量弱,产量递减快,压力下降快。压裂改造受天然裂缝影响,施工易砂堵,且原来改造规模和加砂参数偏低。需要探索适合于该断的增产工艺措施,以利于提高产能,达到高效开发效果。针对该块开发过程中的主要矛盾,通过对前期改造井的分析,和对裂缝方向和裂缝长度的测量,模拟了该块主要地应力方向,探索了该块构造地应力场的特征,从而进一步对车272块进行了整体压裂方案的优化模拟,推荐了适合于该块的增产工艺措施和低伤害压裂液。

Che272 Block of Dongfenggang oilfield belongs to low permeability,low abundance,low off-take potential reservoir.The S4 reservoir in the block is lithology-structural reservoir with an average permeability of 27 × 10-3μm2,low productivity,weak natural energy,rapid production decline and pressure decrease.Fracturing operation is easy to result in sand plugging because of natural cracks.In order to improve off-take potential and arrive the development effect of high efficiency,through the measurement of fractures direction and length,and analyzing the characteristics of stress field in Che272 block,a stimulation treatment and low-damage fracturing fluid suited for Che272 block were put forward,and the effect of field application was very good.