中、高孔渗油井钻完井液漏失伤害处理方法

A Method to Dispose the Damage by Leakage of Drilling and Completion Fluid in Oil Well Penetrated into Medium to High Porosity and Permeability Reservoirs

针对海上中、高孔渗油井钻完井液漏失伤害造成产能下降的问题,研究出一种集有机清洗、解水锁、无机除垢于一体的复合解堵工艺新方法。通过渤中28-2油田C井解堵施工,日产油量由作业前的63.6 m3/d提高到180.6 m^3/d,文昌19-1油田D井日产油量由作业前的4 m^3/d提高到151 m^3/d,增产37.7倍。在海上五口油井中的成功应用,表明该方法能够有效地解除钻完井液漏失造成的伤害,对于类似海上油田解堵有很好的借鉴意义。

To solve the decline of production capacity in oil wells penetrated in medium to high porosity and permeability reservoirs due to the leakage of drilling and completion liquids during workover, a new broken down method has been developed, which integrated with organic cleaning, water lock releasing, and inorganic descaling properties. The oil production of well-C in BZ28-2 oilfield increased from 63.6 m3/d to 180.6 m3/d after applying the new broken down technique. For well-D in Wenl9-1 oilfield, the daily oil production has increased 37.7 times, reaching 151 m3/d compared to 4 m3/d before applications of the treatment. The success application in five offshore wells indicated that the new method can effectively remove damages caused by the leakage of drilling and completion fluid. The new method may provide good reference for similar offshore oil field with broken down techniques.