Conception of a threetier horizontal well for highrisk areas

Abstract:

In view of the complicated and serious leakage and collapse in the highrisk drilling zone in the Jin58 well field in 2017 and the difficulties in the following treatment of oil and gas fields where open holes were completed with preset 4in casing strings in the early period, and with the inhouse research, the survey of tight gas drilling and completion technology status at home and abroad, and the analysis of previous drilling experiences, it is concluded that: (1)there is a narrow negative safety density window at the Jin58 area; therefore the effective method for economic acceleration of ROP is to change the well structure for separate treatment of leakage and collapse under the existing technical and equipment condition; (2)the well is completed with 5in liner hanging down hole without cementing for comprehensive gas field management, reservoir protection and effective release of horizontal well productivity. According to the above conclusions and the actual condition of the environmental monitoring well, the suitable structure and completion method for the Jin58 area are proposed together with the optimal fast drilling and completion plan, which will be of some significance to rapid production in this area.