坐落短节悬挂速度管柱技术的研究与应用

Research of the Locating-Sub Hanging Technology for Velocity String

青海低产气井大修措施后,采用现有速度管柱带压投放技术存在作业时需额外加装井口专用悬挂器,作业后主阀人为设置失效导致浪费,以及作业井口和生产流程改动大等问题。鉴于此,充分结合大修措施井井口零压的特殊条件,并借鉴与常规油管悬挂完井方式接近的芯轴式速度管柱悬挂技术,研发了坐落短节悬挂速度管柱技术及其低成本配套工具。该技术具有前后工艺衔接性好、不动井口作业、施工配套少、作业风险可控性高及作业后见产快等特点。通过在东坪气田2井次的现场应用,验证了工艺的可行性和配套工具的可靠性,并证实该技术适应性好,在减轻人员劳动强度、作业提速和降本方面效果显著。坐落短节悬挂速度管柱技术为低产气井大修措施后投放速度管柱提供了一种较为理想的新方法。

After workover of low-yield gas wells in Qinghai,the existing velocity string snubbing technology has such problems as requiring additional special hanger,the main valve failed,and the wellhead and operation process needing reconstruction.To address the problems,by means of the zero pressure condition of the workover wellhead,and referring to the mandrel-type velocity string hanging technology similar to the conventional tubing hanging technique,the locating sub hanging velocity string technology and its low cost supporting tool are developed.The technology has the features of good operation connection,less operation support,high controllability of operation risk,and quick production after operation.The application in 2 wells in the Dongping gas field verified the feasibility of the process and the reliability of the supporting tools.The technology was proved to be adaptable,and had a great performance in reducing the labor intensity,speeding up the operation and lowering the cost.This technology provides an ideal method for running velocity string after low-yield gas well workover.