钻井液与完井液2016，Vol.33Issue(6)：84-90,7.DOI:10.3696/j.issn.1001-5620.2016.06.015
塔中碎屑岩井自愈合水泥浆固井技术
Cementing Wells Penetrating Clastic Rocks with Self-healing Cement in Block Tazhong
摘要
Abstract
The clastic formations in the Block Tazhong have complex structures,poor lithological characters and toughness,and high brittleness.During drilling operation,wells penetrating the clastic formation have experienced borehole collapse and sloughing,and borehole of irregular sizes was formed.Cementing of the production casing string has long been facing with difficulties such as low formation pressure and mud losses in the Permian system,coexistence of oil and water in the same zone,interbedding of sandstone and shale,thin sandstones and hence multiple pay zones,short distance between a pay zone and a water zone,and inter-channeling of oil and water,etc.Based on the study on the mechanism of gas-channeling in cement slurry,a leading slurry with density of 1.35 g/cm3,and a tail slurry with density of 1.88 g/cm3 were formulated with several additives,such as silica powder,lightweight material BCE-610S,medium temperature retarder BXR-200L,drag reducer BCD-210L,self-healing agent BCY-200S and anti-channeling filter loss reducer BCG-200L.This cement slurry had good stability,mobility,zero free water,low filtration rate (filter loss ＜ 50 mL),elastic modulus near 7 GPa,high compressive strength,and ability of anti-channeling.By optimizing the composition of the cement slurry column in hole,pressure balancing during well cementing was realized.Using well cementing software,the displacing efficiency was improved.As a set of self-healing cementing technology,it has been used in 4 wells in Tazhong,all cementing jobs successful,especially the main pay zones which were cemented with excellent job quality,effectively solved the difficulties in well cementing in clastic rock formations.关键词
碎屑岩井/自愈合水泥浆/平衡压力固井/现场应用Key words
Well penetrating clastic rocks/Self-healing cement slurry/Well cementing under balanced pressure/Field application分类
能源科技引用本文复制引用
田宝振,李清洁,覃毅,孙万兴,沈磊,陈大沧,张亮,周坚..塔中碎屑岩井自愈合水泥浆固井技术[J].钻井液与完井液,2016,33(6):84-90,7.基金项目
中国石油集团渤海钻探工程有限公司局级项目“塔里木台盆区碎屑岩固井技术研究与试验”(2015ZD12Y-2)部分研究成果. （2015ZD12Y-2）
