井下柔性复合管预置电缆数字式分注技术

Digital Separated-Zone Water Injection Technologies with Cable-PresetDownhole Flexible Composite Pipe

杨玲智 周志平 杨海恩 李法龙 胡改星

YANG Lingzhi ZHOU Zhiping YANG Haien LI Falong HU Gaixing

中国石油长庆油田公司油气工艺研究院, 陕西西安 710018 低渗透油气田勘探开发国家工程实验室, 陕西西安 710018 中国石油长庆油田分公司第一采油厂, 陕西延安 716009

Oil & Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi, 710018, China National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields, Xi’an, Shaanxi, 710018, China No.1 Oil Production Plant, PetroChina Changqing Oilfield Company, Yan'an, Shaanxi, 716009, China

低渗透油田分注管柱长期服役后腐蚀结垢严重、分层注水合格率下降快。为此，设计了井下柔性复合管预置电缆数字式分注工艺管柱，研发了智能配水器与过电缆封隔器等关键工具，开展了管柱抗外压、抗拉强度等关键性能室内评价，形成了适用于井下高压条件下的柔性复合管分层注水技术。室内评价结果表明，管柱满足分注井封隔器坐封压力与最大抗外压要求，智能配水器流量测试误差小于2%。现场试验4口井，最长服役时间已超过2年，分层注水合格率100%。研究表明，预置电缆数字式分注技术应用柔性复合管，可以有效提升管柱耐腐蚀性能，实现分层流量自动测调、远程验封和数据监测等功能，满足封隔器坐封、反洗井及后期测试要求，具有较好的应用效果。

Separated-zone water injection string in low-permeability oilfields is challenged by various problems after a long time in service, e.g. severe corrosion, scaling, and rapid decrease of separated-zone water injection conformity rate. To solve these problems, a digital separated-zone water injection string with a technology of cable-preset downhole flexible composite pipes was designed. The key tools, i.e. an intelligent water distributor and a cable-penetrated packer, were developed. Further, the key performances, including external pressure resistance and tensile strength, of the string were evaluated in laboratory. Separated-zone water injection technologies with flexible composite pipes suitable to downhole high-pressure were thereby developed. The laboratory evaluation results demonstrated that the developed string met the requirements on the packer setting pressure in separated-zone water injectors and the maximum external pressure resistance. The measurement error of the intelligent water distributor flow rate was below 2%. Field tests were carried out in four wells. The maximum service time was over 2 years, and the conformity rate of separated-zone water injection was 100%. This study indicates that the application of flexible composite pipes in cable preset digital separated-zone water injection technologies can effectively improve corrosion resistance, achieve automatic measurement and adjustment of separated-zone flow, remote sealing verification, and data monitoring, meet the requirements of packer setting, reverse circulation, and subsequent tests, all of which showcase promising application effects.

国家科技重大专项“低渗-超低渗油藏提高储量动用关键工艺技术”（编号：2017ZX05013-005）、中国石油科技专项“长庆油田波码通信控制分层注水技术与现场试验”（编号：kt2021-15-03）联合资助

https://doi.org/10.11911/syztjs.2022057