大庆长垣特高含水期表外储层独立开发方法
发布时间：2018-12-17 20:22
【摘要】：物性和含油性差的表外储层已经成为大庆长垣特高含水阶段水驱挖潜的主要对象,然而常规的井网加密、分层注水等方法开发效果较差。为此,结合表外储层发育特征和分层压裂工艺,提出了表外储层独立开发方法。根据油水井射孔层位和表内、表外储层空间分布特征,设计了"以水定油"和"以油定水"两种独立开发模式,采用多层人造浇铸岩心开展了水驱物理模拟实验,比较了两种模式的采出程度随注入量的变化特征,推导了考虑启动压力梯度和浅层水平压裂裂缝的分层压裂直井产能公式,计算分析了表外储层独立开发的技术政策界限。研究表明:长垣表外储层独立开发"以油定水"模式优于"以水定油"模式,技术极限井距和经济极限厚度分别为228 m和2 m左右。随着表外储层厚度占总射孔厚度比例的增大,采收率先下降后保持平稳,最后又快速上升。矿场应用表明:表外储层独立开发平均单井日产油量3.7 t,开发效果明显优于三次加密。
[Abstract]:Off-surface reservoir with poor physical property and oil content has become the main target of water drive in the very high water cut stage of Daqing Placanticline, but the conventional methods such as well pattern infill and stratified water injection have poor development effect. In this paper, an independent development method of off-table reservoir is put forward in combination with the development characteristics of off-table reservoir and the technology of stratified fracturing. According to the reservoir spatial distribution characteristics of perforation layer and table in oil-water well, two independent development models, "fixing oil with water" and "fixing water by oil", are designed, and the physical simulation experiment of water drive is carried out by using multi-layer artificial casting core. This paper compares the characteristics of the production degree of the two models with the injection rate, deduces the productivity formula of the stratified fracturing straight well considering the starting pressure gradient and the shallow horizontal fracturing fracture, and calculates and analyzes the technical policy limits of the independent development of the off-table reservoir. The results show that the independent development model of "oil and water" is better than that of "oil with water", and the technical limit well spacing and economic limit thickness are about 228 m and 2 m, respectively. With the increase of the ratio of the reservoir thickness to the total perforation thickness, the oil recovery decreases first, then keeps steady, and finally increases rapidly. The field application shows that the average daily oil production of single well is 3. 7 t, and the development effect is obviously better than that of 3 times infill.
【作者单位】： 中国科学院力学研究所;中国石油勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05010-002)
【分类号】：TE34
[Abstract]:Off-surface reservoir with poor physical property and oil content has become the main target of water drive in the very high water cut stage of Daqing Placanticline, but the conventional methods such as well pattern infill and stratified water injection have poor development effect. In this paper, an independent development method of off-table reservoir is put forward in combination with the development characteristics of off-table reservoir and the technology of stratified fracturing. According to the reservoir spatial distribution characteristics of perforation layer and table in oil-water well, two independent development models, "fixing oil with water" and "fixing water by oil", are designed, and the physical simulation experiment of water drive is carried out by using multi-layer artificial casting core. This paper compares the characteristics of the production degree of the two models with the injection rate, deduces the productivity formula of the stratified fracturing straight well considering the starting pressure gradient and the shallow horizontal fracturing fracture, and calculates and analyzes the technical policy limits of the independent development of the off-table reservoir. The results show that the independent development model of "oil and water" is better than that of "oil with water", and the technical limit well spacing and economic limit thickness are about 228 m and 2 m, respectively. With the increase of the ratio of the reservoir thickness to the total perforation thickness, the oil recovery decreases first, then keeps steady, and finally increases rapidly. The field application shows that the average daily oil production of single well is 3. 7 t, and the development effect is obviously better than that of 3 times infill.
【作者单位】： 中国科学院力学研究所;中国石油勘探开发研究院;
【基金】：国家科技重大专项(2011ZX05010-002)
【分类号】：TE34
【参考文献】
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