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针对某气田注水采气过程中,震旦系和二迭系两种地层水单输、混输产生 Ca C O3 、 Mg C O3 、 Ba C O3 垢,特别是混输中产生 Ba S O4 垢的现状,模拟地层水,对9 种油田常用防垢剂和2 种自制防垢剂进行了评价。从中筛选出对两种地层水单输和混输均有较好效果的3 种防垢剂 W S- 213 A、 H E D P和 A T M P;再用正交试验法对3 种防垢剂的防垢试验条件进行优化,得出同时满足两种地层水单输和混输防垢的较优实验条件。即防垢剂选用 W S- 213 A,浓度30m g/l, P H= 8 .0 。在此实验条件下,对两种地层水单输防垢率可达90 % ,混输防垢率可达75 % 。
In the process of water injection and gas recovery in a gas field, single and mixed transport of two kinds of formation water, ie, Sinian and Permian systems, produces CaCO 3, Mg 3 O 3 and Ba C O 3 scale, especially BaSO 4 scale The current status of simulated formation water was evaluated on nine commonly used scale inhibitors and two self-contained scale inhibitors. Three kinds of antiscalant W S- 213 A, H E D P and A T M P, which have good effect on single-input and mixed-transport of two kinds of formation water, were screened out. Three orthogonal methods Scale anti-scaling test conditions optimization, obtained at the same time meet the two kinds of formation water single input and mixed anti-scaling anti-scaling of the better experimental conditions. That anti-scaling agent W S- 213 A selection, the concentration of 30m g / l, P H = 8. 0. Under this experimental condition, the single-scale anti-scaling rate of the two kinds of formation water can reach 90%, and the mixed anti-scaling rate can reach 75%.