高压注水井带压作业凝胶封堵体系性能评价
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1.中国石油长庆油田分公司第九采油厂;2.中国石油长庆油田分公司第三采油厂

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国家自然科学基金(51663013)


Performance Evaluation of Gel Plugging System for High Pressure Water Injection Well
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No.3 Oil Production Plant of Changqing Oilfield Company, PetroChina

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    摘要:

    为满足高压注水井带压作业对凝胶封堵体系的强度、成胶时间以及可破胶的性能要求,采用AM/AMPS(丙烯酰胺/2-丙烯酰胺基-2-甲基丙磺酸)为二元聚合物体系,Smel30(三羟甲基化合物)为交联剂制备了一种耐温抗盐凝胶封堵体系。研究了温度、无机盐、模拟油含量、剪切时间对凝胶体系成胶时间和凝胶强度的影响,同时研究了破胶剂过硫酸钠用量对凝胶体系的破胶效果的影响。研究结果表明,温度60℃时,凝胶强度为73.5Pa,成胶时间为7h;加入三种无机盐,聚合物链间距离减小,成胶时间缩短,凝胶强度略有增加,且三种盐对成胶时间和凝胶强度的影响顺序为NaCl<MgCl2<CaCl2;抗油污和抗剪切能力较强,在剪切60min后,凝胶强度仍能保持81%以上。凝胶体系老化15天未出现脱水且凝胶强度仍有67Pa;过硫酸钠可以高效低成本破胶,残液表观黏度低于64.4mPa·s。

    Abstract:

    In order to meet the strength, gelation time and gel breaking performance requirements of gel plugging system for high pressure water injection wells under pressure, a temperature-resistant and salt-resistant gel plugging system was prepared by using AM / AMPS ( acrylamide / 2-acrylamide-2-methylpropanesulfonic acid ) as binary polymer system and Smel30 (Trihy-droxymethyl compound) as crosslinking agent. The effects of temperature, inorganic salt, simulated oil content and shear time on gelation time and gel strength of the gel system were studied. At the same time, the effect of dosage of gel breaker sodium persulfate on gel breaking effect of gel system was studied. The results showed that the gelation time was shortened with the increase of temperature. When the temperature was 60 °C, the gelation strength was 73.5Pa and the gelation time was 7 h. The addition of inorganic salts reduced the distance between polymer chains, shortened the gelation time, and slightly increased the gel strength. The influence of three salts on gelation time and gel strength was NaCl < MgCl2 < CaCl2; the system has strong resistance to oil pollution; after shearing for 60 min, the gel strength can still maintain more than 81 %, which has strong shear resistance. The gel system did not dehydrate after 15 days of aging and still had strong gel strength; sodium persulfate can be used as a gel breaker with high efficiency and low cost, and the apparent viscosity of the residue is less than 64.4 mPa·s.

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  • 收稿日期: 2022-08-24
  • 最后修改日期: 2022-10-17
  • 录用日期: 2022-11-09
  • 在线发布日期: 2023-08-03
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