RESEARCH AND APPLICATION OF CIRCULATE FOAM DRILLING COMPLETION FLUID

To solve such problems as lost circulation during drilling process,the damage to oil and gas reservoir with lower pressure and lower penetrability,circulate foam drilling completion fluid system was studied,it is fit for stratum characteristic of Changqing oil and gas field.Test indicates this circulate foam drilling completion fluid system performance stabilization,density low(0.7~0.96 g/cm3);The effect of antileakage and lose circulation controls was in evidence,has tiny hole temporary stop up effect,and no damage to producing pay.Oil and gas output of test well had improved.It has provided a new technic means for drilling antileakage,lose circulation control and oil and gas layer protective technology,and has a better application foreground in low pressure and low penetrability oil and gas field in Erdos basin.