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注水开发可以保持油层产能,但由于长期注水,地下已形成多压力层系,加之地层中流体渗流的冲刷、侵蚀水泥环,严重地影响了水泥环的胶结质量。根据大庆油田地质特点研制了水渗流模拟装置,并利用该装置进行压差和冰渗流对水泥环胶结质量影响的试验研究。试验结果表明,在现场固井中压差应控制在1—9 MPa;水渗流影响固井质量的临界流速为49.76 mm/h;在高含水、高渗透地层中,提高固井质量的措施是调整钻井液性能以及在固井前充分洗井,消除浮泥饼。
However, due to long-term water injection, multi-pressure strata have formed in the underground, and erosion of the cement ring by erosion of fluid seepage in the strata has seriously affected the cementing quality of the cement ring. Based on the geological characteristics of Daqing Oilfield, a simulation device of water seepage was developed and the influence of pressure difference and ice percolation on the cementing quality of cement ring was studied. The test results show that the pressure difference in cementing should be controlled at 1-9 MPa; the critical flow rate of water seepage affecting the cementing quality is 49.76 mm / h; and in high-water and high-permeability formations, the measures to improve the cementing quality are to adjust Drilling fluid performance as well as well washing well before cementing to eliminate mud cake.