Research and Application of Organic and Inorganic Hybrid Thixotropic Agents
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摘要: 在解决恶性井漏、薄弱地层固井问题时,可加入触变剂形成触变水泥浆。目前触变水泥浆体系存在触变性不够强、对温度敏感以及综合性能欠佳等问题,限制了现有触变剂的应用。为了提高水泥浆体系的触变性,选择异戊烯醇聚氧乙烯醚TPEG、N,N-二甲基丙烯酰胺DMAA、丙烯酸AA等单体合成有机聚合物TDA-1,利用杂化的方式将有机聚合物与无机膨润土复配,研制出一种触变性良好的新型触变剂CBJ-1。并研究了该新型触变剂对水泥浆性能的影响。利用红外光谱、XRD表征触变剂的结构,采用初终切实验测试了水泥浆的触变性。结果证明,该新型触变剂CBJ-1合成成功,温度适用范围较广,改善了其温度敏感问题。将其加入水泥浆后,触变水泥浆的初终切差值较大,具备良好的触变性,且水泥浆的失水及稠化性能不受影响,综合性能优异。Abstract: A thixotropic cement slurry can be obtained by adding thixotropic agent into a common cement slurry, and this thixotropic cement slurry can be used to deal with severe mud losses and difficulties in cementing a well penetrating weak formations. Thixotropic cement slurries presently in use have several shortages such as weak thixotropy, sensitive to temperature changes and poor overall performance etc., limiting their use in dealing with downhole problems. To improve the thixotropy of a cement slurry, a new thixotropic agent was developed by combining an organic polymer TDA-1 and the inorganic bentonite. TDA-1 is a polymer synthesized from isopentenol polyoxyethylene ether (TPEG), N, N -dimethyl acrylamide (DMAA) and acrylic acid (AA). TDA-1 and bentonite were then hybridized to produce the new thixotropic agent CBJ-1. The effects of the new hybridized inorganic thixotropic agent CBJ-1 on the performance of cement slurries were studied. Using IR and XRD, the molecular structure of CBJ-1 was characterized. Using gel strength test, the thixotropy of the cement slurry was measured. The experimental results show that the new thixotropic agent was successfully synthesized. It has wide range of work temperature, thus can be used to mitigate the temperature sensitivity problem of a thixotropic cement slurry. A cement slurry treated with CBJ-1 has big difference between the initial gel strength and the final gel strength, meaning that the cement slurry has good thixotropy. CBJ-1 has no negative effect on the filtration rate and thickening performance of the cement slurry. The experimental results show that CBJ-1 has excellent general performance.
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Key words:
- Oil well cement /
- Thixotropic agent /
- Polymer /
- Bentonite /
- Plugging
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表 1 加有不同触变剂水泥浆在50 ℃及90 ℃养护后的静切力
水泥浆 50 ℃ 90 ℃ 初切/Pa 终切/Pa 初终切之差/Pa 初切/Pa 终切/Pa 初终切之差/Pa 纯水泥 0.87 2.40 1.53 1.53 5.11 3.58 水泥+TDA-1 1.02 3.07 2.05 1.64 9.20 7.56 水泥+膨润土 11.67 39.60 27.93 19.42 60.43 41.01 水泥+CBJ-1 17.26 51.02 33.76 25.62 74.10 48.48 注:水泥浆配方为600 g水泥+1.2%触变剂+4%降失水剂BXF-200L+46%水。 -
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