高温压裂液产生硫化氢因素分析

Cause Analysis of Hydrogen Sulfide Produced in High Temperature Fracturing Fluid

在高温储层压后返排过程中,产生了微量硫化氢气体。根据现场条件进行模拟试验研究产生硫化氢的原因。结果表明,高温为压裂液反应产生硫化氢提供了条件;破胶剂和含硫温度稳定剂同时参加反应才能产生硫化氢;储层中含硫矿物在高温高压条件下可能发生反应产生硫化氢。在高温压裂液配方优化时,尽量避免选择含硫的温度稳定剂,以减小高温地层产生硫化氢的风险。

Trace hydrogen sulfide gas was produced in the post-frac flowback process of high temperature and high pressure reservoirs.The cause of hydrogen sulfide was studied by simulated experiment according to the field condition.The experimental results show that the high temperature provides the conditions for the reaction and both gel breaker and temperature stabilizer containing sulfur are introduced in the reaction of hydrogen sulfide.Hydrogen sulfide may be produced from reaction of minerals containing sulfur under high temperature and high pressure conditions.Therefore,in the optimization of fracturing fluid formulation,the choice of temperature stabilizer containing sulfur should be avoided as far as possible for the purpose of reducing the risk of hydrogen sulfide in high temperature formation.