TAMBOCOCHA 43区块尾管固井难点及对策  

Difficulties in Cementing Liners in Block Tambococha 43 and Corresponding Measures

作　　者：潘宇强 唐凯 PAN Yuqiang;TANG Kai(Changqing Well Cementing Division of CNPC Chuanqing Drilling Engineering Company Limited,Xi’an,Shaanxi 710018;Research Institute of Drilling and Production Engineering Technology,CNPC Chuanqing Drilling Engineering Company Limited,Xi’an,Shaanxi 710018)

机构地区：[1]川庆钻探工程公司长庆固井公司,西安710018 [2]川庆钻探工程公司钻采工程技术研究院,西安710018

出　　处：《钻井液与完井液》2019年第4期495-499,共5页Drilling Fluid & Completion Fluid

摘　　要：厄瓜多尔TAMBOCOCHA区块单井日产量300~1100t。因开采需求导致井身结构特殊,φ244.5mm技术套管下深距产层小于30m,随钻井径数据失真严重,水泥浆用量难以确定,φ177.8mm尾管固井施工风险高。下尾管前不通井、窄间隙顶替效率低、产层油水活跃等问题导致固井质量难以保证。通过对复合前置液体系设计,微膨胀胶乳水泥浆体系研究及窄间隙旋转尾管固井施工工艺研究,形成了TAMBOCOCHA区块底水油藏旋转尾管固井技术,该技术有助于尾管下入到位,准确估算裸眼段环空容积,有效提高套管居中度;前置液冲洗效率为93%,水泥浆12h抗压强度为36.4MPa。现场应用15口井,固井质量优质率达95%,为强底水油藏大斜度小间隙井固井提供技术支撑,解决了厄瓜多尔TAMBOCOCHA区块特殊井身结构的固井难题。The daily production rate of a single well in the Block Tambococha in Ecuador is from 300 t to 1,100 t.The casing program is special because of special production requirements;the distance between the running depth of the φ177.8 mm liner and the top of the reservoir is less than 30 m.Caliper logging data acquired from LWD are seriously distorted,making it dif ficult to determine the amount of cement slurry,and a high risk of cementing the φ177.8 mm liner exists.Previous practice shows that the job quality of cementing cannot be ensured if wiper trip is not performed prior to running liners,or a high displacement efficiency in narrow annulus cannot be obtained,or the oil and water in the reservoir are active.A rotating liner cementing technology for use in bottom water reservoirs in Block Tambococha was developed through designing of a compound spacer,studying on micro-expansion latex cement slurry as well as studying on the rotating liner cementing techniques for annulus of narrow clearance.This technology is helpful to run liner to the designed depth,to accurately determine the annular volume of an open hole section and to improve the casing centrality.The flushing ef ficiency of the spacer is 93%,and the 12 h compressive strength of the set cement slurry is 36.4 MPa.Application of the technology on 15 wells gave a rate of excellent cementing job quality of 95%,providing a technical support to the success of cementing narrow-annular-clearance highly deviated wells for strong bottom water reservoirs and resolving the problem of cementing wells with special casing profile in Block Tambococha in Ecuador.

关 键 词：尾管固井 复合前置液体系 微膨胀胶乳水泥浆体系 TAMBOCOCHA区块 厄瓜多尔 

分 类 号：TE256[石油与天然气工程—油气井工程]