Stratified Water Injection Technology of Concentric Seal-Check, Logging and Adjustment Integration in Changqing Oilfield
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摘要:
为了提高长庆油田定向井小水量分层注水的测试效率、降低作业强度及测试成本，研究了同心验封测调一体化分层注水技术及关键工具。该技术采用机电一体化控制方法，利用电缆控制井下测试仪器进行验封及测试调节工作；借鉴离合器的工作原理，将电动直读验封仪与同心电动测调仪集成为验封测调一体化仪器，不仅使其具有验封仪、测调仪的功能，而且还进一步提高了仪器的集成化、自动化程度。该技术在长庆油田430余口井进行了应用，一趟作业完成全井验封、测调等全部工序，测调成功率达到98.0%，单层测调误差小于10.0%，单井验封测试时间由6～8 h缩短至4 h以内，单井年作业费用降低0.96万元。同心验封测调一体化分层注水技术为低渗透油藏低成本开发提供了一种新的技术手段。
Abstract:In order to improve the test efficiency and to reduce the operation intensity and test cost of stratified water injection technology with small water volume in directional wells of Changqing Oilfield, the stratified water injection technology and key tools of concentric seal-check, logging and adjustment integration were studied. Mechatronics control method was adopted and the downhole test instrument was controlled by cable to carry out the seal-check, logging and adjustment. According to the principle of mechanical clutch structure, existing electric seal-check device was integrated with concentric electric measuring and adjusting instrument, the proposed technology further improved the degree of integration and automation with the functions of early seal-check device and measuring and adjusting instrument. The technology has been applied to more than 430 wells in Changqing Oilfield with one-trip operation completing the whole process of seal-check, measurement and adjustment. The success rate of logging and adjustment was up to 98.0%, and the logging and adjustment error of single layer was less than 10%. The average test duration of single well seal-check has been reduced from 6-8 hours to 4 hours, and the annual operation cost of single well was reduced by 9,600 yuan. The successful development of the stratified water injection technology of concentric seal-check, logging and adjustment integration could provide a new and high-efficiency test method for developing low permeability reservoirs in a cost-saving way.
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图 1 验封测调一体化仪器的基本结构
1. 电缆接头；2. 超声波流量计；3. 扶正器；4. 磁定位短节；5. 控制模块；6. 电机；7. 定位爪；8. 验封离合机构；9. 皮碗；10. 测调离合机构；11. 调节爪
Figure 1. Basic structure of seal-check, logging and adjusting integration instrument
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图 2 一体化配水器的基本结构
1.上接头；2.定位防反转机构；3.出水口；4.配水器主体；5.同心活动筒；6.扶正机构；7.下接头
Figure 2. Basic structure of integrated water distributor
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