阿姆河右岸B区块巨厚盐膏层固井技术  

Cementing technologies for heavy thick salt-gypsum layers in the Amu Darya Right Bank Block B,Turkmenistan

作　　者：陈怀高 余建 乐尚文 汪月鹃 

机构地区：[1]川庆钻探工程公司土库曼斯坦分公司 [2]川庆钻探工程公司井下作业公司

出　　处：《天然气工业》2010年第5期66-68,共3页Natural Gas Industry

基　　金：中国石油天然气集团公司科研计划科技现场试验项目"土库曼斯坦复杂盐下气田快速高效勘探开发技术"(编号:2008-15)

摘　　要：土库曼斯坦阿姆河右岸B区块上侏罗统启莫里阶组地层分布有900～1200m巨厚盐膏层,在钻井和开发初期发生了盐膏层段井径变化大、盐岩的塑性流动、挤毁套管等复杂情况,给钻井和固井施工带来了严重的威胁。在分析盐膏层特点和固井难点的基础上,采用了以下针对巨厚盐膏层的固井工艺技术:①优化套管强度;②检测和控制盐膏层蠕变速度,采用欠饱和盐水水泥浆体系,提高套管的居中度以及根据上层339.7mm套管鞋处地层承压情况,结合环空液柱组合优化注水泥施工参数,在井下不漏失的情况下实现大排量顶替,从而提高顶替效率。以San-21井的巨厚盐膏层固井施工为例,第一级固井采用抗盐两凝欠饱和盐水水泥浆体系;缓凝水泥浆密度设计为1.94g/cm3,封固井段为2267～2800m,快干水泥浆密度设计为1.97g/cm3,封固井段为2800～3614.92m;盐膏层厚1138m,固井质量优良。The 900-1200 m thick salt-gypsum layer is discovered in the Kimmeridgian Formation of Jurassic Series in the Amu Darya Right Bank Block B,Turkmenistan.In the earlier drilling and exploration there,problems like a big variation in hole diameters,plastic flow of salt-gypsum rocks,and casing collapsing posed serious threat to the drilling and cementing construction.Based on an analysis of the characteristics of the salt-gypsum layer and the cementing difficulties,the following cementing technologies are proposed:①Optimizing the casing strength;②Detecting and controlling the creep rate of the salt-gypsum layer,improving the degree of casing center with the undersaturated salt-brine slurry system,and improving the displacement efficiency by achieving a high volume displacement without lost circulation based on the compression of the formation at upper 339.7 mm casing shoe and the optimizing injection parameters of annulus fluid column combination.Taking the well San-21 as a case study,we adopted the salt-resistant and undersaturated salt-brine slurry system with two-setting time in the first-stage cementing,which enables a segment of 2267-2800.00 m to be cemented by the slow-setting slurry with a density of 1.94 g/cm3 and 2800.00-3614.92 m cemented by the quick-setting cement with a density of 1.97 g/cm3.The cementing quality was excellent at the salt-gypsum layer with 1138.00 m in thickness.

关 键 词：土库曼斯坦 阿姆河右岸 盐膏层 盐水水泥浆 固井 San-21井 

分 类 号：TE256[石油与天然气工程—油气井工程]