窄密度窗口正注反挤低密度水泥浆固井技术  

Normal Spotting and Reverse Squeezing of Low-density Cement Slurries in Wells with Narrow Safe Drilling Windows

作　　者：丁志伟 李嘉奇 赵靖影 张明辉[4] 殷昌盛 何理 DING Zhiwei;LI Jiaqi;ZHAO Jingying;ZHANG Minghui;YIN Changsheng;HE Li(CNPC Engineering Technology R&D Company Limited,Beijing 102206;Exploration Department of PetroChina Southwest Oil and Gas Field Company,Chengdu,Sichuan 610000;Development Department of PetroChina Southwest Oil and Gas Field Company,Chengdu,Sichuan 610021;PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000;No.1 Cementing Company BHDC,PetroChina,Renqiu,Hebei 062552;Downhole Service Company,CNPC Chuanqing Drilling Engineering Co Ltd,Chengdu,Sichuan 610052)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京102206 [2]西南油气田分公司勘探事业部,成都610000 [3]西南油气田分公司开发事业部,成都610021 [4]中国石油天然气股份公司塔里木油田分公司,新疆库尔勒841000 [5]渤海钻探工程有限公司第一固井分公司,河北任丘062552 [6]川庆钻探工程有限公司井下作业公司,成都610052

出　　处：《钻井液与完井液》2019年第6期759-765,共7页Drilling Fluid & Completion Fluid

基　　金：中国石油天然气集团有限公司“深层与复杂地层钻完井新技术新方法研究”课题4“复杂工况条件下深井固井密封力学机理及控制技术研究”(2019A-3910)

摘　　要：针对西南油气田分公司蓥北1井φ273.05 mm套管固井存在漏层多、分布广,油气显示活跃,低温低密度水泥浆强度低及发展慢等固井难题。开发出了密度为1.23 g/cm^3的高强度韧性防窜低密度水泥浆体系,该体系稠化时间可调,静胶凝强度发展快,62℃下440 min即起强度、24 h强度高达14.5 MPa,弹性模量为5.8 GPa。通过采用低密度高强度韧性防窜水泥浆、抗污染冲洗隔离液技术、软件模拟、优化浆柱结构、结合低密度与常规密度正注和反挤等配套技术,确保了蓥北1井φ273.05 mm套管固井施工安全,固井质量合格率为85%、优质率为65%。为西南油气田窄密度窗口固井提供了技术参考。Theφ273.05 mm section of the well Yingbei-1(Southwest Oilfield)penetrated formations with widely distributed thief zones and active oil and gas zones.Low density low temperature cement slurries used in previous cementing operations had low strength and slow hardness development.To address these problems encountered,a high strength low density(1.23 g/cm3)cement slurry with high toughness and the ability of anti-channeling has been developed.This cement slurry has thickening time that is adjustable and fast developed gel strength.The strength of the cement slurry develops after 440 min at 62℃,and reaches the maximum value of 14.5 MPa after 24 h.The elastic modulus of the cement is 5.8 GPa.Using this cement slurry with other technical measures,such as contaminationresistant flushing spacer,software simulation,optimization of the structure of the cement slurry column,and normal spotting/reverse squeezing etc.,theφ273.05 mm casing string was successfully and safely cemented.Rate of certified job was 85%and rate of quality job was 65%.The technology used in cementing the well Yingbei-1 has provided a technical reference for cementing wells with narrow safe drilling windows in southwest oil and gas field.

关 键 词：漏失 窄密度窗口 低密度水泥浆 正注反挤 固井 固井质量 

分 类 号：TE256.6[石油与天然气工程—油气井工程]