一种高效液体型解卡剂在巴基斯坦的研究与应用  

Study and Application of a High Efficiency Liquid Pipe Freeing Agent in Pakistan

作　　者：李巍 吉永忠 杨刚 黎凌 程文博 LI Wei;JI Yongzhong;YANG Gang;LI Ling;CHEN Wenbo(International Engineering Company,CNPC Chuanqing Drilling Engineering Co.,Ltd.,ChengDu,Sichuan 610051;Drilling&Production Technology Research Institute,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Guanghan,Sichuan 618300;Oil&Gas Field Applied Chemistry Key Laboratory of Sichuan Province,Guanghan,Sichuan 618300)

机构地区：[1]中国石油川庆钻探工程有限公司国际工程公司,成都610051 [2]中国石油川庆钻探工程有限公司钻采工程技术研究院,四川广汉618300 [3]油气田应用化学四川省重点实验室,四川广汉618300

出　　处：《钻井液与完井液》2022年第1期46-52,共7页Drilling Fluid & Completion Fluid

基　　金：中国石油川庆钻探工程有限公司科研项目“巴基斯坦液体型解卡技术研究”(CQ2021B-F-49-3)。

摘　　要：针对目前巴基斯坦常用粉末解卡剂Black Magic存在配制时间长,加重易沉淀,与钻井液兼容性差,解卡成功率低等问题,以解卡剂对泥饼的破坏泥饼效果、穿透泥饼时间和极压润滑系数为评价指标,实验优选得到了一种高效液体解卡剂ZL SPOT。在此基础上,通过考察油水比、解卡剂和增黏剂对泥饼破坏和穿透的影响,得到了以0#柴油、解卡剂、清水和有机土组成的加重解卡液配方。实验结果发现:对于非加重解卡液,液体解卡剂在1.0%~2.5%浓度下,其极压润滑系数为0.069,100 mL解卡液穿透泥饼时间仅15 min,泥饼浸泡2 h后能见明显的网状裂纹,优于粉末解卡剂;对于加重解卡液,固相的加入会严重影响解卡效果,但提高解卡剂浓度至8%后,解卡液浸泡后的泥饼能出现网状裂纹;密度1.32~1.80 g/cm^(3)的解卡液在120℃静置16 h后,无重晶石沉淀;解卡液与水基钻井液按1∶1比例混合,钻井液流变性和滤失基本不受影响。该液体解卡剂在巴基斯坦成功应用两口井,验证了解卡效果,且施工简单,具有推广应用前景。Black Magic is a widely used pipe freeing agent in Pakistan.Problems existed with the use of this pipe freeing agent include long time of preparation,weighting agents in the pipe freeing slurry which are easy to settle,poor compatibility of the Black Magic with drilling fluids used and low success rate of pipe freeing operations.A new high efficiency pipe freeing agent,ZL SPOT,was selected to solve these problems based on three evaluation parameters,say,degree of mud cakes broken down by the pipe freeing agent,time spent penetrating the mud cakes and extreme pressure friction coefficient.By studying the effects of oil/water ratio,pipe freeing agent and viscosifier on the break-down and penetration of the mud cakes,a weighted pipe freeing slurry was formulated with 0#diesel oil,ZL SPOT,water and organophilic clay.Laboratory experimental results showed that for unweighted pipe freeing slurry,at a concentration of the pipe freeing agent between 1%and 2.5%,the extreme pressure friction coefficient was 0.069,time for 100 mL pipe freeing slurry to penetrate the mud cakes was only 15 min,and after soaking in the pipe freeing slurry,mud cakes were obviously developed with fracture network on the surfaces,indicating the ZL SPOT is superior to the dry pipe freeing agent Black Magic.For weighted pipe freeing slurry,addition of solids into the slurry greatly affects the efficiency of freeing a stuck pipe.However,when the concentration of the ZL SPOT was increased to 8%,the mud cakes were developed with fracture network after being soaked in the pipe freeing slurry.When stood still for 16 h at 120℃,the pipe freeing slurry with its density between 1.32 g/cm^(3)and 1.80 g/cm^(3)showed no signs of barite settling.When mixed with water based drilling fluid at a ratio of 1∶1,the pipe freeing slurry basically did not affect the rheology and filtration rate of the drilling fluid.This liquid pipe freeing agent has been successfully used on two wells drilled in Pakistan,proving its pipe freeing ability.Field operation with this pi

关 键 词：液体型解卡剂 压差卡钻 泥饼破坏 穿透泥饼时间 解卡 

分 类 号：TE254.4[石油与天然气工程—油气井工程]