不同酸液条件下叙利亚灰岩溶蚀能力的实验研究

高翔; 蒋建方; 吴川; 刘光普; 李龙; 蒋睿

doi:10.11932/karst20150214

不同酸液条件下叙利亚灰岩溶蚀能力的实验研究

doi: 10.11932/karst20150214

1.
中国石油大学提高采收率研究院
2.
中国石油大学提高采收率研究院/中国石油大学石油工程教育部重点实验室
3.
中国石化石油勘探开发研究院采油工程技术研究所

基金项目: “十二五”国家科技重大专题项目“孔隙型碳酸盐岩油藏提高采收率采油工艺关键技术”（2011ZX05031-003-004）

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出版历程
- 发布日期: 2015-04-25

Experiments on solubility of different acidizing fluids to Syrian limestone

1.
Research Institute of Enhanced Oil Recovery, China University of Petroleum
2.
Research Institute of Enhanced Oil Recovery, China University of Petroleum/Key Laboratory of Ministry of Education in Petroleum Engineering, China University of Petroleum
3.
Oil Production Engineering Technology Institute, SINOPEC

摘要

摘要: 文章根据SY/T 6526-2002《盐酸与碳酸盐岩动态反应速率测定方法》，利用高温高压酸岩反应仪进行了普通盐酸、有机盐酸、胶凝酸、乳化酸和地面交联酸与叙利亚灰岩粉末在两个目的层温度95 ℃和150 ℃下2.0 h的溶蚀实验。结果显示，五种酸液2.0 h的酸溶解率都在90%以上，普通盐酸、有机盐酸的溶蚀能力高于胶凝酸、乳化酸和地面交联酸三种缓速酸；95 ℃下乳化酸和地面交联酸溶解慢、溶解率低，而150 ℃下是地面交联酸和胶凝酸；适当条件下，“多相隔离”对H+抑制作用要比高粘度溶液强，而且随着酸液内部高分子之间链接复杂程度的提高，H+被束缚的程度也增大；温度提高增大了酸溶解率，对乳化酸、地面交联酸和胶凝酸影响比较显著，对普通盐酸和有机盐酸不明显。
- 灰岩 /
- 缓速酸 /
- 酸岩反应 /
- 溶蚀能力
Abstract: Acidizing stimulation treatment always plays a very important role in enhancement of the production of oil and gas wells. Whether the characteristics of the chosen acid fluids used in the acidizing treatment meet the quality of formation determines success of the treatment. With development for more than half century, it has already evolved from conventional acids including normal hydrochloric acid and mud acid to retarded acids including multicomponent acid fluid, emulsified acid fluid, gelled acid fluid and surface cross-linked acid fluid. However, many of the unconventional oil and gas reservoirs are buried very deep, which leads to the reaction temperature between acid and formation rock becomes higher. This can fasten the reaction rate of acid and rock, decrease the effective distance of live acid, and lower the efficient acid fluids. The final result is the stimulation treatment cannot remove the damage of near well-bore, increase the production of oil and gas wells and reach the aim of deep-penetration. To solve the problems above, many researchers made character evaluation of only 1 to 2 acid fluids and the temperature in the experiments is too limited, which is not enough to many unconventional reservoirs. Besides, to retarded acids, exploring the reaction mechanism from the perspective of molecular is essential. Based on SY/T 6526-2002 of “Method of Testing the Rate of Dynamic Reaction between Hydrochloric Acid and Carbonate”,several experiments were conducted on the solubility of hydrochloric acid, organic acid (hydrochloric acid combined with acetic acid), gelled acid, emulsified acid and surface cross-linked acid to Syrian limestone powder by using acid - core reaction device under the conditions of high pressure and temperature in laboratory. The results show that，(1) The solubility of five acidizing fluids to limestone is above 90% in 2 hours. (2) The solubility of hydrochloric acid and organic acid to limestone is stronger than other three kinds of retarded acid. (3) Although the speed of dissolution of emulsified acid and surface cross-linked acid is slow, correspondingly low solubility under 95℃, due to destruction of stability of emulsified acid under the condition of higher temperature of 150℃, both the rate of dissolution and the solubility are highly enhanced. (4) In temporary condition, the inhibiting effect of “multiphase isolation” for H+ is stronger than high viscosity, and the more complex the linking between macromolecules is, the severer constraining effect for H+ will be. (5) The increase of temperature obviously speeds up the rate of dissolution, and has a great effect on the solubility of gelled acid, emulsified acid and surface cross-linked acid, but not at all for normal hydrochloric acid and organic acid. We obtained several different acidizing fluids’ reaction rates and solubility values at different times under different temperatures, which would be helpful for the optimization of acidizing fluid systems in oilfields.
- limestone /
- retarded acid /
- acid -core reaction /
- solubility

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