Research on the completion technology of pressure balance well for production after fracturing
Facing the problems of reservoir contamination in terms of killing fluid,long operation cycle and high cost of pressure operation during the process of removing the pump after casing fracturing,mechanical,pressure-controlled,and dissolvable tempo-rary blocker of the wellbore were developed in which the downhole control was the key concern to achieve"downhole sealing,well-head zero pressure".Based on this,three types of completion technology of pressure balance well have been developed,which can be optimized based on different wellbore structures,wellhead pressure after fracturing,and formation production.The temporary blockers of the wellbore have a bidirectional pressure bearing over 35 MPa,a temperature resistance of 150℃,an adjustable switch pressure difference of 10-20 MPa,and a diameter over 40 mm after opening.They are suitable for casing production channels with an outer diameter of 139.7 mm.Field application shows that the serialized pressure balance well completion technology possesses the advantages of shortened construction period by 4-6 d,pollution free to the reservoir,fracturing effect ensurance,and rapid production.
production after fracturingpressure balance well completiondownhole controlwellbore temporary blockerrapid production
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