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针对地层埋深大，温度高(>150℃)的地区，实际固井生产中存在不同程度的漏失，严重影响固井质量等问题，开发出了一种流变性好、稳定性强、密度范围宽、实现封堵的抗高温防漏型隔离液，通过在隔离液中添加核桃壳刚性架桥材料，并复配以木质素纤维和聚合物可变形胶束，用以在隔离水泥和钻井液时对地层裂缝实现有效封堵。采用自由基水溶液聚合方法，用2-丙酰胺基-2-甲基丙磺酸(AMPS)和丙烯酰胺(AM)及其衍生物，合成了适用于隔离液的聚合物堵漏剂，通过红外光谱分析，各单体成功参与反应。对复合堵漏剂的配比加量进行了优选，当复配堵漏剂配比为1%木质素纤维+2%聚合物+1%18目核桃壳时，隔离液能达到160℃下5 MPa的堵漏承压能力。通过对隔离液的综合性能的评价，包括隔离液的高温稳定性、流变性能、与水泥浆的流变相容性，证明得到的隔离液的高温稳定性和流变性能优良，在160℃时上下密度差为0.01 g·cm-3,与水泥浆的流变相容性、稠化相容性和失水相容性较好，不会影响水泥浆的泵送且不会缩短胶凝时间。
Abstract：There are a lot of safety and engineering problems about loss and leakage during well cementation on deep layer and high-temperature district. To solve this, we developed a kind of high-temperature plugging spacer fluid that is of great rheological properties, highly stable and covering a wide range of density. To add rigid bridging materials and lignin fibre cooperating with deformable polymer micelles, efficient plugging on layer cracks has been achieved. A polymer plugging agent matched spacer fluid was synthesized through free radical aqueous solution copolymerization with the monomers of 2-acrylamido-2-methyl-propane sulphonic acid(AMPS) and acrylamide(AM). The structure of the polymer was identified by FTIR analysis. With the ratio of 1% lignin fiber+2% polymer+1% walnut shell which mesh number is 18, the plugging agent successfully made the loss circulation spacer fluid seal the crack under 5 MPa at least. It proves that density contrast between different depth is no more than 0.01 g·cm-3 upon 160 ℃, and the sealing pressure reaches 5 MPa at least. The spacer has great stability under high temperature and rheological properties through comprehensive evaluation test. Its compatibility with cement slurry was identified ideally by tests of rheological properties, thickening time and fluid loss, showing that the spacer fluid will not influence cement slurry pumping and fluid loss ability and will not shorten cementitious time badly.
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基本信息:
DOI：10.13353/j.issn.1004.9533.20210389
中图分类号:TE256
引用信息:
[1]路飞飞,易浩,薛兆丰,等.抗高温堵漏隔离液的研制与评价[J].化学工业与工程,2022,39(03):73-79.DOI:10.13353/j.issn.1004.9533.20210389.