静17块小井距加密调整方案研究

发布时间：2019-03-05 14:38

【摘要】：静17块构造上位于静安堡构造带东部,开发目的层为S34段,为岩性-构造油藏,属扇三角洲前缘沉积,平均孔隙度14.3%,平均渗透率76×10-3μm2。油藏埋深-2070m~-2230m,含油面积6.1km2,地质储量669.85×104t。静17块自1988年投入开发以来经历了三个不同阶段,分别为上产阶段、稳产阶段、递减阶段。由于储层孔隙度、渗透率比较低,再加上原油性质为高凝油,在开发上有很大难度。主要问题是低渗透砂岩油藏大井距条件下注水效果不好,油井见效差,严重影响区块整体开发。静17块目前采油速度只有0.19%,采出程度6.89%,按照目前井距和开发井网很难达到区块的标定采收率17.5%。因此有必要开展包括直井加密、水平井加密、水平井穿层压裂等多方案研究,落实合理的井网井距,编制合理的加密方案,完善注采井网,实现区块注水开发,改善区块开发效果。在国外,人们多采用“反九点法注水--五点法--加密井网--三次采油”的思路开发低渗透油田,并取得了较好的效果。一般来讲,较大井网密度、较大水驱控制程度下获得的采收率相对较高。在国内,长庆石油管理勘探局利用正交试验进行数值模拟优化开发方案,以累计净现值最大所对应的井网密度为合理井网密度。在单指标分析(采出程度、稳产年限和累计净现值)的基础上进行多指标综合分析,寻求最优方案设计。
[Abstract]:Block Jing 17 is structurally located in the eastern part of Jinganbao structural belt, and the development target layer is S34 member, which is a lithologic-structural reservoir, belonging to fan delta front deposit with an average porosity of 14.3% and an average permeability of 76 脳 10 ~ (- 3) 渭 m ~ 2. The buried depth of the reservoir is-2070m / m ~ 2230m, the oil-bearing area is 6.1km~ 2, and the geological reserve is 669.85 脳 104t. Since it was put into development in 1988, Jing 17 block has gone through three different stages, namely, upper stage, stable stage and decreasing stage. It is very difficult to develop because of the low porosity and permeability of the reservoir and the high condensate properties of the crude oil. The main problem is that the water injection effect is not good under the condition of large well spacing in low permeability sandstone reservoir, and the effect of oil well is poor, which seriously affects the overall development of the block. At present, the oil recovery rate of Jing 17 block is only 0.19%, and the recovery degree is 6.89%. It is difficult to reach the standard recovery rate of 17.5% according to the current well spacing and development pattern. Therefore, it is necessary to carry out multi-scheme research including straight well infill, horizontal well fracturing and so on, to carry out reasonable well pattern spacing, to compile reasonable infill scheme, to perfect injection-production well pattern, and to realize water flooding development in block. Improve the effect of block development. In foreign countries, the idea of "anti-nine-point water injection-five-point method-infilling well pattern-tertiary oil recovery" is often used to develop low permeability oil fields, and good results have been obtained. Generally speaking, the higher the well density and the higher the control degree of the water drive, the higher the oil recovery. In China, Changqing Petroleum Management and Exploration Bureau makes use of orthogonal test to carry out numerical simulation and optimization development scheme, taking the maximum cumulative net present value corresponding well pattern density as the reasonable well pattern density. On the basis of single index analysis (mining degree, stable production life and cumulative net present value), the multi-index comprehensive analysis is carried out to find the optimal scheme design.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE324

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