静态参数对板桥油田板南断块CO吞吐效果影响研究

Investigation on the Effect of Static Parameters of CO Huff and Puff in Banqiao Oilfield Bannan Fault Block

车正家 胡子龙 马利 王顺利 梅蓉 崔轶男

CHE Zhengjia HU Zilong MA Li WANG Shunli MEI Rong CUI Yinan

中国石油天然气股份有限公司大港油田分公司第四采油厂地质研究所, 天津 300280; 油气藏地质及开发工程国家重点实验室·西南石油大学, 成都 610500

Geology Institute of 4th Oil Production Plant, Dagang Oilfield Company of CNPC, Tianjin 300280, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

为改善板桥油田板南断块产能低、含水较高、采出程度低和地层能量不足等问题， 2018年12月对板14-1断块水平井45 H实施CO2吞吐技术，降水增油效果明显。为了在板南断块推广该技术，进行静态参数对CO2吞吐效果影响研究。根据板南断块的地质特征，运用油藏数值模拟方法，通过对比不同静态参数下单井累计增油量和换油率，开展储层孔隙度、渗透率、地层原油黏度、水平井长度及避水高度对水平井二氧化碳吞吐效果的影响研究。结果表明，地层原油黏度及水平井避水高度对底水能量活跃的常规稠油油藏CO2吞吐效果影响较大，储层孔隙度、渗透率和水平井长度的影响较小。对于板南断块，适宜进行CO2吞吐的区块孔隙度为30%~35%，渗透率（1 300~1 900）×10-3 μm2，地层原油黏度50~65mPa·s，水平井长度200~230 m及水平井避水高度4~6 m。

To solve the problems of development in the Bannan fault block, Banqiao Oilfield, including low productivity, high water cut, low degree of production, and lacking formation energy, the CO2 huff and puff technology was applied to the horizontal well 45H of Ban14-1 block in December 2018. The production data indicated that this technology can reduce water cut and recover deliverability effectively. In order to promote this technology in Bannan fault block, the effect of static parameters of CO2 huff and puff was studied. According to the general geological characteristics of the Bannan fault block, the influencing factors of CO2 huff and puff of horizontal wells were investigated by comparing cumulative oil increment and oil exchange rate in different conditions with the reservoir numerical simulation methods. The result shows that the formation oil viscosity and the height of horizontal well avoidance have a significance influence on CO2 huff and puff of conventional heavy oil reservoirs with active bottom water energy. However, the influence of reservoir porosity, permeability and horizontal well length is weak.For the Bannan fault block, the block suitable for CO2 huff and puff should have a porosity of 30%~35%, a permeability of (1 300~1 900)×10-3 μm2, a formation oil viscosity of 50~65 mPa·s, a horizontal well length of 200~230 m, and a horizontal well avoidance height between 4~6 m.

四川省教育厅创新团队计划项目“温室气体二氧化碳埋存与资源化利用”（编号：16TD0010）；四川省科技计划项目“特低渗透油藏CO驱微观渗流理论及影响机制研究”（编号：2019YJ0423）。

https://doi.org/10.3969/j.issn.1008-2336.2019.03.038