Multi cluster perforation optimization design method and its application effect of tight sandstone horizontal wells in Qiulin area, central Sichuan

TANG Botao; ZENG Ji; CHEN Weihua; CHEN Yixin; WANG Tao; LIU Cheng; FENG Feng

doi:10.13809/j.cnki.cn32-1825/te.2022.02.009

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Multi cluster perforation optimization design method and its application effect of tight sandstone horizontal wells in Qiulin area, central Sichuan
Issue 2, Pages: 337-344(2022)
Published：2022
DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.009
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DOI：

TANG Botao, ZENG Ji, CHEN Weihua, et al. Multi cluster perforation optimization design method and its application effect of tight sandstone horizontal wells in Qiulin area, central Sichuan[J]. Petroleum Reservoir Evaluation and Development, 2022, (2): 337-344. DOI： 10.13809/j.cnki.cn32-1825/te.2022.02.009.

摘要

针对川中秋林地区致密砂岩储层天然裂缝欠发育，低孔、低渗且空间非均质性强的问题，通过室内物模实验确立了“段内多簇+高强度加砂+造长缝”的改造理念，在此基础上构建基于有效应力理论的井周应力场计算模型，并结合水平井渗流—应力耦合裂缝延伸模型，明确了簇间距对裂缝竞争扩展及缝间渗流干扰的影响机制，形成了考虑应力干扰及渗流阴影的河道砂体非均匀布缝方法，确定了秋林地区致密砂岩水平井段内多簇射孔最优簇间距为7～12 m，使射孔簇开启率高达92.3%以上，有效提高了致密气储层改造效果。

Abstract

In order to solve the problems that the natural cracks of the dense sandstone reservoir in Sichuan region is undeveloped with low hole

low permeability and strong spatial heterogeneity

the transformation idea of “segment clusters created + sand + high strength long slot” is established by the indoor model experiments. On this basis

a calculation model of stress field around the wells based on the effective stress theory is established. Meanwhile

the above model is combined with the flow-stress coupling fracture extension model for horizontal wells to clarify the influence mechanism of cluster spacing on the crack competition expansion and interseam seepage interference. Therefore

the non-uniform arrangement method of cracks in the sand body of river channel considering stress interference and seepage shadow is formed. It is concluded that the optimal spacing of multiple clusters in the horizontal well section of dense sandstone in Qiulin is seven to twelve meters

which can make the opening rate of the injection cluster up to 92.3 %. This method effectively improves the effect of the transformation of the tight gas reservoirs.