摘要
用于砂岩油气层的一般酸化施工作业采用的酸液体系多数含有氢氟酸,其有效作用距离短,活性酸达不到储层深部,并且还会形成一系列不溶性沉淀物,对储层造成新的伤害。通过室内实验研究提出一种新的酸液体系——氟钛络合物(FTC)酸液体系。由室内实验的FTC酸液体系酸度曲线及FTC酸度曲线应用于砂岩酸化的可行性分析表明:FTC缓慢释放出氢氟酸,酸度变化较小,降低了酸岩的反应速度,增大了有效作用距离,同时也具有一定的缓蚀性,在酸化中能降低缓蚀剂的用量,较常规土酸更具有砂岩酸化优势。
Most acid solution system for acidization of sandstone hydrocarbon zone contains hydrofluoric acid. The effective distance of acid solution is too for active acid to reach deeper reservoir. Furthermore, secondary and tertiary reaction of its byproducts fluorosilicic and fluorine-aluminum compounds will take place and then form some insoluble deposits resulting in reservoir dam-age. In this paper, a new acid solution system-FTC acid solution system-has been put forward through experimental study. Feasibility assessment of applying the acidity curves of FTC and the FTC system to sandstone acidization shows that FTC can release slowly the hydrofluoric acid with a small change of acidity, lower the reaction speed of acid-rock,and increase the effective dis-tance. It possesses a certain corrosion inhibition so that corrosion inhibitor can be reduced during acidization. Therefore, FTC is more advantageous than conventional mud acid in sandstone acidization.
出处
《天然气技术》
2010年第4期50-52,共3页
NATURAL GAS TECHNOLOGY
关键词
砂岩
基质酸化
酸度
酸度计
酸液体系
pH值
sandstone, matrix acidization, acidity, acidimeter, acid solution system, pH
