板桥油田特高含水期水平井CO2吞吐参数优化及实施  

Optimization and implementation of CO2 huff and puff parameters of horizontal wells in Banqiao Oilfield during extra high water cut period

作　　者：张涛[1] 李德宁 崔轶男 刘永河 车正家 王顺利 Zhang Tao;Li Dening;Cui Yinan;Liu Yonghe;Che Zhengjia;Wang Shunli(N0.4 Oil Production Plant, Dagang Oilfield Company, CNPC, Tianjin 300280, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China)

机构地区：[1]中国石油大港油田分公司第四采油厂,天津300280 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《油气藏评价与开发》2019年第3期51-56,共6页Petroleum Reservoir Evaluation and Development

基　　金：四川省教育厅创新团队计划项目“温室气体CO2埋存与资源化利用”(16TD0010);四川省科技计划项目“特低渗透油藏CO2驱微观渗流理论及影响机制研究”(2019YJ0423)

摘　　要：目前板桥油田板14-1断块油藏含水率98.1%,采出程度10.93%,常规控水稳油技术已无法解决油藏含水高、产能低、经济效益差的问题。和常规控水增油技术相比,CO2吞吐压锥具有工艺简单、施工周期短、成功率较高等优势。采用数值模拟技术研究了CO2吞吐降水增油机理,并在此基础上,优化了CO2吞吐工艺参数,确定了油藏水平井CO2吞吐最优工艺方案。在方案优选基础上,现场实施了CO2吞吐方案。研究结果显示,CO2吞吐通过气驱压锥,萃取原油中间组分,降低原油黏度机理实现了特高含水期水平井控水增油;通过对比不同工艺参数下单井累计增油量及换油率,CO2的最优注入量为600t、注入速度4.0t/h、焖井时间17d、产液量16m^3/d、吞吐轮次2个。45H井现场先导试验显示,45H井产液量为12m^3/d,含水率由98.1%降低至62.5%,产油量由1.6m^3/d上升至4.73m^3/d,CO2吞吐控制底水锥进、降低油井含水率和恢复产能效果明显。研究表明,水平井CO2吞吐对板桥油田同类油藏具有较好的适应性和应用推广前景。At present, the water cut of fault block 14-1 reservoir in Banqiao Oilfield is 98.1 % and the recovery degree is 10.93 %. Conventional water control and oil stabilization technology can not solve the problems of high water cut, low productivity and poor economic benefit. Compared with conventional water control and oil enrichment technology, CO2 huff and puff cone has the advan. tages of simple technology, short construction period and high success rate. The mechanism of precipitation and oil increase by CO2 huff and puff is studied by numerical simulation technology. On this basis, the technological parameters of CO2 huff and puff are op. timized, and the optimal technological scheme of CO2 huff and puff for horizontal wells in reservoirs is determined. On the basis of scheme optimization, CO2 huff and puff scheme was implemented on site. The results show that CO2 huff and puff achieves water control and oil increase in horizontal wells at extra high water cut period by extracting the intermediate components of crude oil through gas drive pressure cone and reducing the viscosity mechanism of crude oil. By comparing the cumulative oil increase and oil exchange rate of single well under different process parameters, the optimal injection rate of CO2 is 600 t, injection rate is 4.0 t/h, soaking time is 17 d, fluid production is 16 m^3/d, and the number of huff and puff cycles is two. Field pilot test of well 45H shows that the fluid production of well 45H is 12 m^3/d, the water cut is reduced from 98.1 % to 62.5 %, and the oil production is increased from 1.6 m^3/d to 4.73 m3/d. CO2 huff and puff can control bottom water coning, reduce water cut and restore productivity effectively. The results show that horizontal well CO2 huff and puff has good adaptability and application prospect for similar reservoirs in Banq. iao Oilfield.

关 键 词：CO2吞吐 水平井 特高含水期 板桥油田 

分 类 号：TE357[石油与天然气工程—油气田开发工程]