高分子凝胶堵漏剂的研究

宋元洪; 杨蓉; 庄建山; 吕梦妮; 辛志军; 杜梦昱; 何晓平

doi:10.3969/j.issn.1001-5620.2016.05.020

高分子凝胶堵漏剂的研究

doi: 10.3969/j.issn.1001-5620.2016.05.020

1.
渤海钻探第一固井分公司, 河北任丘 062552
2. 西安理工大学理学院, 陕西西安 710048
3. 湖北工业大学, 湖北武汉 432200
4. 渤海钻探第四钻井工程分公司, 河北任丘 062552

详细信息

作者简介:
宋元洪,高级工程师,1961年生,毕业于石油大学(华东)工商管理专业,现在从事固井工作。电话18232813230;E-mail:hejianyong@cnpc.com.cn。

中图分类号: TE256.6
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出版历程
- 收稿日期: 2016-03-25
- 刊出日期: 2016-09-30

Study on Polymer Gel Lost Circulation Material

1.
No. 1 Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552
2. Faculty of Science, Xi'an University of Technology, Xi'an, Shaanxi 710048
3. Hubei University of Technology, Wuhan, Hubei 432200
4. The 4th Drilling Engineering Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552

摘要

摘要: 漏失井、长封固段井固井过程中，易发生井漏，造成水泥浆低返，进而漏封油层，固井施工难度大。为此以聚丙烯酸钠（PAANa）和壳聚糖（CTS）为原料，以过硫酸钾（KPS）为引发剂，以N，N-亚甲基双丙烯酰胺（NMBA）为交联剂，碳酸钙（CaCO₃）作为增强剂，通过优化PAANa和CTS二者比例，以水溶液聚合接枝共聚法制备高分子凝胶堵漏剂（CPA）。确定了最佳制备条件：单体配比CTS：PAANa=1：7，引发剂加量为3.3%，交联剂加量为2.1%，反应温度为60℃，碳酸钙加量为1%。利用红外光谱方法评价PAANa和CTS共聚接枝化学反应，并开展了CPA在不同盐溶液、温度、pH值下的吸水性能。结果表明，高分子凝胶堵漏剂的抗盐性较好；在不同盐溶液中的吸液能力依次为NaCl < MgCl₂ < CaCl₂；温度越高，吸水速率越快，但最大吸水倍率基本相同，温度对吸水倍率影响不大；pH值在5～9时其吸水能力最强。
- 壳聚糖 /
- 聚丙烯酸钠 /
- 堵漏剂 /
- 吸水
Abstract: In cementing wells that lost circulation have ever occurred, or wells with long cementing section, loss of cement slurry into loss zones will result in a cement top that is lower than the designed depth, hence leaving the reservoir sections uncemented. To deal with these problems, a polymer gel lost circulation material (LCM), CPA, was developed through water solution graft copolymerization. The copolymerization used sodium acrylate (PAANa) and chitosan (CTS) in optimized ratio as raw materials, potassium persulphate (KPS) as initiator, N, N-methylene-bis-acrylamide (NMBA) as cross linking agent, and calcium carbonate (CaCO₃) as enhancer. The optimum reaction conditions were as follows:CTS:PAANa=1:7, initiator concentration=3.3%, concentration of cross linking agent=2.1%, reaction temperature=60℃, concentration of CaCO₃=1%. The synthesized product was characterized with IR spectroscopy, and was studied for its water adsorptivity in different salt solutions, temperatures, and pH values. The evaluation indicated that CPA had good salt tolerance, and its water adsorptivity in different salt solutions were in the order NaCl > MgCl₂ > CaCl₂. CPA had higher water adsorption rates at higher temperatures, while the maximum water adsorption scale factor remained almost the same. At pH value of 5-9, CPA had the maximum water adsorptivity.
- Chitosan /
- Sodium acrylate /
- Lost circulation material /
- Water adsorption

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