长庆气田储层属于“三低”储层,因压裂酸化等改造措施进入地层及井筒的液体,返排非常困难,长期滞留不仅对储层造成伤害,而且直接影响试气速度和资料的准确录取。对于致密地层的气井,由于气藏的渗透率较低,流通性差,导致天然气的生产速度较低;另外,大量气井在生产过程中因种种因素导致地层堵塞,造成气井产量下降,对于低压气井,返排压井液就成为问题。 The reservoirs in Changqing Gas Field belong to the “three low” reservoirs. Because of fracturing and acidizing measures, fluids entering the formation and wellbore are very difficult to return to. The long-term residence not only causes damage to the reservoir, but also directly affects the test gas velocity and Accurate admission of information. For the gas wells in the tight formations, the production rate of natural gas is low because of the low permeability and poor liquidity of the gas reservoirs. In addition, a large number of gas wells are clogged by various factors in the production process, resulting in a decrease in gas well production. For low pressure gas wells, Back to kill fluid has become a problem.