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1、I论 文 题 目酸溶性镁氧水泥浆 体系研究 摘 要 目前油田在储层封堵和暂闭时一般使用的是 G 级油井水泥，所形成的封堵层酸溶蚀效果差将影响 后期酸化改造效果，储层伤害大，开发效率低。为有效提高开发过程中对暂闭层或封堵层的解堵能 力，必须开发出一套具有强酸溶性的水泥浆体系才能解决储层伤害问题。 论文分析了氯氧镁水泥的水化机理及影响水化反应的因素，实验考察了水热环境下氯氧镁水泥抗压 强度发展规律及影响因素，并考察了水泥石的抗水性和酸溶特性。实验结果表明：氯氧镁水泥石早 期强度很高，但是强度随养护时间和温度的增加急剧衰退；氯氧镁水泥石抗水性差且未能很好改善； 加入 5%碳酸钙以后水泥石酸溶性能良好
2、，酸溶速度随着碳酸钙加量、酸液体积和温度的增加而增 加，且温度对酸溶速度影响最为突出，在同体积酸液中浸泡，养护时间对酸溶速度影响极小，该规 律可为该套体系施工作业后的酸化解堵提供参考。 实验考察了水热环境下硫氧镁水泥抗压强度发展规律和硫氧镁水泥石抗水性、酸溶特性。结果表明： 硫氧镁水泥低温强度低于氯氧镁水泥，但是随养护温度和时间的增加强度变化很小；水泥石抗水性 好，在水中浸泡 28 天强度依然大于 14 MPa；虽然理论需酸量稍高于氯氧镁水泥，但是添加 10%碳 酸钙以后酸溶率仍能大幅度提高。兼顾抗压强度发展、反应速度及水泥凝结状态、水泥石抗水性能 及酸溶特性、套管腐蚀等多项因素，实验确定了硫
3、氧镁水泥可以作为酸溶性水泥浆体系水泥基本材 料。 为探索酸溶性硫氧镁水泥浆体系的工程应用可行性，实验考察了硫氧镁水泥浆工程应用性能的可调 性，包括密度、流动度、滤失量、凝凝时间、稠化时间及酸溶率，结果表明，水泥浆密度可调，流 动性良好，不加降滤失剂即可控制滤失量，凝结时间和稠化时间可调，正常密度范围内水泥石 72 小时抗压强度大于 14MPa，在 18 倍盐酸中浸泡 2 小时酸溶率达 95，研究结果为该体系的进一步 开发与应用提供了理论基础。 论文通过室内实验详细考察了镁氧水泥在油田储层封堵和暂闭应用中的可行性，完成了酸溶性镁氧 水泥浆体系基材优选，探讨了水热环境下强度随养护温度和时间变化的机
4、理及酸溶机理，选用外加 剂对水泥浆工程性能进行了调节，初步开发出一套可满足现场应用要求的硫氧镁类酸溶性水泥浆体 系，研究结果为开发强酸溶性水泥浆体系奠定了基础。关键词 暂闭封堵 镁氧水泥 抗压强度 抗水性能 酸溶性能 IIAbstract The class G cement is usually used to block the leakage layer or close the reservoir temporarily in field currently.Because the acid soluble effect of the plugging layer which form
5、ed by the cement is poor, it would influence the effect of later acid treatment, the damage to reservoir is serious, and the development efficiency is low. In order to improve the blockage relieving ability of temporary closure layer or plugging layer in development process, it is necessary to desig
6、n a slurry system with strongly acid-soluble ability to solve reservoir damage problem. The hydration mechanism and the influence factor of hydration reaction were analysed in this paper, the law of resist compression development of magnesium oxychloride cement and the influence factor under hot wat
7、er were inspected by experiment, and the water-resisting property and acid-soluble quality of cement stone were also inspected by experiment. The results indicated that the early strength was very high, but the strength sharply declined along with the curing time and temperature increasing, the wate
8、r-resisting property is bad and could not be improved very well, the acid-soluble quality was fine after added 5% calcium carbonate, the speed of acid dissolution increased along with the calcium carbonate usage, volume of acid liquor and temperature increasing, and the experimental temperature was
9、the most important factor, curing time had little influence on the acid-soluble rate when immersing in the same volume of acid liquor. It is the match point of inferring to blockage relieving with acid after cementing. The resist compression and the influence factor under hot water of magnesium oxys
10、ulfate cement were inspected by experiment, and the water-resisting property and acid-soluble quality of magnesium oxysulfate cement were also inspected.The result indicated that the early resist compression of magnesium oxysulfate cement was lower than magnesium oxychloried cement, however the resi
11、st compression changed little by the curing time and temperature increasing. The water-resisting property of cement stone was well, the resist compression was higher than 14 MPa when immersed in water after 28 days. Although the academic acid required is a bit higher than magnesium oxychloride cemen
12、t, the acid-soluble rate could meet the requirements after added 10% calcium carbonate.The experiment gave consideration to many things such as resist compression development, reaction speed, cement jelling state, the water-resisting property and acid-soluble performance of cement stone, the corrosi
13、on of casing pipe and so on, the experiment comprehensively determined magnesium oxysulfate cement as the basic cement material of acid-soluble slurry system. In order to probe the engineering application fasibility of acid-soluble magnesium oxysulfate slurry system, the adjustability of engineering
14、 application fasibility which included density, liquidity, filter loss, jelling time，thickening time and acid-soluble rate were tested. The results indicated that the density of slurry was adjustable, the liquidity was very good, the filter loss could controlled without filtrate reducer, the jelling
15、 time and thickening time were adjustable, the resist compression of cement stone in normal density range was higher than 14MPa after curing 72 hours, the acid-soluble rate could reach 95% after immersed in hydrochloric acid with 18 double of cement for two mimutes, the research results provided the
16、ory basis for further developing and applying this system. The paper particularly inspected the fasibility of magnesium oxygen cement when applied in field to block the leakage layer or close the reservoir temporarily, and completed the optimization for base material of acid-soluble magnesium oxygen cement system, it also discussed the mechanism of resist compression development in hot water with the curing time and tempreture changed,
