Study on Gel Plugging Agent and Plugging Mechanism Based on Hydrophobic Association
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摘要: 井漏问题一直是影响钻井作业安全与高效进行的重大挑战。以甲基丙烯酸月桂酯（LMA）为疏水性单体，丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、丙烯酸（AA）为亲水性单体，通过自由基聚合法合成了凝胶封堵剂（LAS），并利用Al3+金属离子与聚合物分子链上的羧基配位作用增强凝胶的力学性能。结果表明，LAS凝胶表现出可再交联特性，在高温和高压条件下具有良好的封堵性能和自适应性。在120℃、6 MPa下，2%浓度的LAS凝胶对20～40目、40～60目和60～80目裂缝模拟砂床的漏失体积分别为69.5 mL、58.3 mL和41 mL，封堵性能明显优于常规凝胶和传统封堵剂。同时，LAS凝胶在不同温度和盐浓度条件下均具有较好的溶胀和流变性能，可在地层温度激发下形成稳定的封堵层，从而有效降低漏失体积。LAS凝胶的动态可再交联性使其在高温和高压环境下依然保持良好的封堵效果，在工作液漏失治理方面有着一定的应用前景。Abstract: lost circulation has long been a major challenge affecting the safety and efficiency of drilling operations. In this study, a gel plugging agent (LAS) was synthesized via free radical polymerization using lauryl methacrylate (LMA) as the hydrophobic monomer and acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and acrylic acid (AA) as hydrophilic monomers. The mechanical properties of the gel were enhanced by the coordination interaction between Al3+ metal ions and carboxyl groups on the polymer molecular chains. The results demonstrated that the LAS gel exhibited re-crosslinkable characteristics, along with excellent plugging performance and self-adaptive properties under high-temperature and high-pressure conditions. Under conditions of 120℃ and 6 MPa pressure, the leakage volumes of 2% LAS gel for simulated fracture sand beds with particle sizes of 20-40 mesh, 40-60 mesh, and 60-80 mesh were 69.5 mL, 58.3 mL, and 41 mL, respectively. This plugging performance significantly surpassed that of conventional gels and traditional plugging agents. Additionally, the LAS gel demonstrated superior swelling and rheological properties across varying temperatures and salinity levels. It could form a stable plugging layer under formation temperature activation, effectively reducing leakage volume. The dynamic re-crosslinking capability of the LAS gel ensured robust plugging effects even in extreme high-temperature and high-pressure environments, highlighting its potential for application in workflow leakage control.
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Key words:
- Lost circulation materials /
- Gels /
- Dynamic reversible bond /
- Hydrophobic association /
- Re-crosslinking
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表 1 LAS凝胶的溶胀动力学参数
T/℃ n 截距 R2 20 0.966 −0.694 0.989 50 0.718 −0.474 0.957 80 0.591 −0.364 0.947 
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表 2 LAS凝胶对基浆流变和滤失性能的影响
堵漏浆 AV/
mPa·sPV/
mPa·sYP/
PaFLAPI/
mL膨润土浆 12.0 7.0 5.0 25.8 膨润土浆+2%LAS 14.5 8.0 6.5 12.3
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