委内瑞拉低压高渗漏地层小间隙尾管固井技术

刘振通; 党冬红; 和建勇; 王莹; 宋元洪; 郭文猛; 张玉鹏; 王洪峰

doi:10.3969/j.issn.1001-5620.2017.06.016

委内瑞拉低压高渗漏地层小间隙尾管固井技术

doi: 10.3969/j.issn.1001-5620.2017.06.016

1. 渤海钻探工程有限公司第一固井分公司, 河北任丘 062550;
2. 渤海钻探国际钻采物资供应分公司, 天津 300457;
3. 渤海钻探工程有限公司油气井测试分公司, 河北廊坊 065200

详细信息

作者简介:
刘振通,工程师,1961年生,长期从事海内外固井现场技术工作。电话13932740833;E-mail:784505571@qq.com。

中图分类号: TE256.3
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出版历程
- 收稿日期: 2017-08-25
- 刊出日期: 2017-11-30

Technology for Cementing Liners in Low Pressured Wells with High Seepage Rates and Narrow Annular Clearance in Venezuela

1. The First Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552;
2. International Drilling Materials Supply Company(Bidding Center), BHDC, Tianjin 300457;
3. Oil and Gas Well Logging Branch of CNPC Bohai Drilling Engineering Company Limited, Langfang, Hebei 065200

摘要

摘要: 委内瑞拉P.D.M油气田，是20世纪80年代发现的轻质原油和伴生天然气油气田，油田地质条件复杂。钻井采用五层套管结构，五开φ165.1 mm井眼，使用油基钻井液，下入φ139.7 mm生产层尾管至井深5 200 m左右，封固渐新统Merecure组粗砂岩油气藏。该油气田经长期开发产能下降，当前日均单井产量不足60 m³/d，部分区块储层衰竭，压力亏空，形成低压高渗漏地层，给固井带来风险。固井作业时采用复合型多功能前置液体系，依据Merecure储层低压高渗漏和伴生天然气高含H₂S的地层特性，应用低密度水泥浆降低环空液柱压力，降低井漏风险，提高水泥石韧性，优选了具有低失水量和良好流动性、静胶凝强度过渡时间不大于25 min、能降低环空气窜几率的高性能水泥浆及相应工艺技术措施，完成该油田低压高渗漏地层小间隙尾管固井，封固质量优质。
- 小间隙 /
- 低压储层 /
- 高渗漏地层 /
- 尾管固井 /
- 前置液 /
- 水泥浆
Abstract: The P.D.M Oilfield, located in Venezuela, is an oilfield of light crude with associated natural gas put into production in 1980. Geologic conditions in this oilfield are very complex. Wells with five intervals were designed for the development of the oilfield. Oil base drilling fluid was used to drill the fifth interval. The ϕ165.1 mm borehole section was cased with ϕ139.7 mm liners to about 5 200 m to seal off the coarse sandstone reservoir in Merecure formation (Oligocene series). After long time of development, the P.D.M oilfield is approaching depletion, daily production rate of a single well is less than 60 m³. Reservoir depletion has resulted in formation pressure depletion and hence lost circulation during drilling, and risks in well cementing. In well cementing operations, multi-function compound prepad fluids had to be used. Furthermore, H₂S existed in the associated natural gas. To deal with these problems, low density cement slurry was used to reduce the pressure in annulus exerted by fluid column, thereby to minimize the risks of lost circulation. High performance cement slurry with high toughness was selected for well cementing. The cement slurry had low filter loss, good mobility, transit time of gel strength less than 25 min, and the ability to minimize gas channeling in annular space. With the optimized cement slurry and operational techniques, liners in wells with low pressure, high seepage rates and narrow annular clearance have been successfully cemented.
- Narrow annular clearance /
- Low pressure /
- High seepage rate /
- Liner string /
- Prepad fluid /
- Cement slurry

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参考文献(14)

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