一种天然气井用泥饼固化剂的性能评价与现场应用
Performance Evaluation and Field Application on a Mud Cake Solidification Agent for Natural Gas Wells

为了提高元坝地区天然气井固井二界面胶结质量，介绍了一种适用于水基钻井液条件下的泥饼固化剂GJM。室内实验结果表明，在温度压力为120℃ × 0.01 MPa、泥饼厚度为0.5 mm的条件下，采用GJM的固井二界面胶结强度较未采用GJM的提高了8~10倍。GJM与水基钻井液和水泥浆具有良好的相容性，满足天然气井固井作业要求。5口天然气井的现场应用结果表明，固井一、二界面胶结质量合格率100%，优良率100%。其中，YL12井目前已完成压裂测试，天然气产量77.17万方/日，且压裂前后环空均未出现带压，为高压天然气的高效勘探开发提供了良好的井筒保障。
To improve the cementing quality of the cement-formation interface in natural gas wells in Yu-anba area, a mud cake solidification agent (GJM) is introduced. It is suitable for the condition of water-based drilling fluid. The results of laboratory experiments show the bonding strength of the cement-formation interface using GJM is 8~10 times higher than that without GJM under the condition of 120？C × 0.01 MPa and 0.5 mm of the mud cake thickness. GJM has good compatibility with water-based drilling fluid and cement slurry, which meets the cementing requirements of natural gas wells. The field application results of five natural gas wells show that the qualification rate of cementing quality at the casing-cement and cement-formation interfaces is 100%, and the excellent and good rate is 100%. Among them, natural gas well YL12 has completed the fracturing test. The natural gas production reached 77.17 × 104 m3/d. There is no pressure in the annulus before and after fracturing, which provides a good wellbore guarantee for the efficient exploration and development of natural gas.