高温水平井环空化学封隔材料配方体系优化及性能研究

doi:10.3969/j.issn.1006-6535.2026.01.020

摘要/Abstract

摘要： 针对油田高温地层注水井套管变形、封隔器频繁失效等问题,研制了一种适用于高温油藏的水平井环空化学封隔材料,对其开展触变性能、环空充填性能、强度性能等测试,并对体系封堵率进行计算。研究表明:耐高温ACP(环空封隔技术)材料最优化配方为:4.000%丙烯酰胺单体+2.500%LAP触变剂+0.007%过硫酸铵引发剂+(0.005%~0.007%)MBAm交联剂。该体系结构恢复速率为0.726,符合行业标准要求,且经过剧烈剪切60 s并静置60 s后,体系网状结构恢复,结合力增强,表明该材料触变性能较好;在温度为90 ℃条件下该体系可实现瞬时环空充填,同时无重力坍塌现象,在轴向上以活塞运动的方式向两侧运移,始终保持环空充填的完整性;封堵率为99.68%,突破压力梯度为7.5 MPa/m,说明该体系具有较好的封堵能力;放置60 d后体系轴向滑移压力与径向击穿压力均大于0.5 MPa,表明不会由于压力过高而发生凝胶在筛管与井壁之间的环空内滑动或者凝胶被破坏,可直接用于高温水平井堵水。该研究对水平井注水开发提供了理论指导。

关键词: 水平井, 环空化学封隔器, 耐高温, ACP, 触变性

Abstract: In view of issues such as casing deformation and frequent failure of packers in high-temperature reservoir water injection wells,a chemical packer material suitable for horizontal well annuli in high-temperature reservoirs was developed.Its thixotropic properties,annular filling performance,and strength were tested,and the system sealing efficiency was evaluated.The results indicate that the optimal formulation of the high-temperature ACP(annular chemical packer)material is 4.000% acrylamide monomer+2.500% LAP thixotropic agent+0.007% ammonium persulfate initiator+(0.005% to 0.007%)MBAm crosslinker.The system structural recovery rate is 0.726,meeting industry standards.After intense shearing for 60 seconds and then standing for 60 seconds,the network structure of the system recovers and its cohesive strength increases,indicating good thixotropic performance.At 90 ℃,the system can achieve instantaneous annular filling with no gravitational collapse,and it migrates axially in a piston-like manner to both sides,maintaining the integrity of annular filling.The sealing efficiency is 99.68%,and the breakthrough pressure gradient is 7.5 MPa/m,indicating excellent sealing capacity.After 60 days,the system axial slip pressure and radial breakdown pressure remain above 0.5 MPa,indicating that excessive pressure does not cause the gel to slide in the annulus between the screen and the wellbore or cause the gel damage.Thus,this material can be directly used for water shutoff in high-temperature horizontal wells.This study provides theoretical guidance for horizontal well water injection development.

Key words: horizontal well, annular chemical packer, high temperature resistance, ACP, thixotropy

中图分类号:

TE242.2

宿志昊, 付美龙, 刘漪雯, 黎旭东. 高温水平井环空化学封隔材料配方体系优化及性能研究[J]. 特种油气藏, 2026, 33(1): 167-174.

SU Zhihao, FU Meilong, LIU Yiwen, LI Xudong. Optimization of formulation and performance of an annular chemical packer material for high-temperature horizontal wells[J]. Special Oil & Gas Reservoirs, 2026, 33(1): 167-174.

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