RECOVERY METHOD FOR FORMATION FLUID FROM HORIZONTAL DRILL HOLE Russian patent published in 2017 - IPC E21B43/00 

FIELD: petroleum industry.

SUBSTANCE: invention refers to the petroleum industry and may be used during recovery of the formation fluid from obliquely directed and horizontal marginal wells of tight formation with abnormally low formation pressure (ALFP). According to the method, the arrangement of subsurface equipment (ASE) consisting of a plug, a liner filter, a circulation valve, anchors, a versatile horse head pump (VHHP) with an intake valve, sucker rod strings, and strings of pumping and compression pipes (PCP) is descended to a set interval of a horizontal cased borehole section. The transition of the VHHP intake valve into the operation condition is performed. Then, the transition of an anchor into the operation condition in the set interval of the well. Further, the plunger descent with the VHHP discharge valve on a sucker rod string. Then, the VHHP discharge valve is switched to the operation condition, after what, using a flushing unit, the first pressuring of PCP is performed. Then, the second pressuring of a PCP string is performed with the help of a lifting device, after what the sucker rod string with the help of the polish rod is connected to the wellhead drive. Then, the third pressuring of the PCP string is performed. After this, the well is commissioned into operation, brought to the mode, and the recovery of the formation fluid from the uncased part of the tight formation with ALFP. After completion of works, the extraction of ASE is performed.

EFFECT: increasing of efficiency of recovery of the formation fluid from obliquely directed and horizontal marginal wells of tight formation with ALFP.

2 cl, 1 dwg