Pressure-control drilling system utilizing automatic shunt manifold for pressure-control drilling and pressure-control drilling method

Abstract

The invention discloses a pressure-control drilling system utilizing an automatic shunt manifold for pressure-control drilling and a corresponding pressure-control drilling method. The pressure-control drilling system comprises a drilling spool, a rotary control head, a drilling column, an automatic shunt manifold, an automatic throttle manifold and a throttle manifold; the drilling spool, the rotary control head and the drilling column are arranged at a wellhead at the upper part of a mineshaft; and the automatic shunt manifold, the automatic throttle manifold and the throttle manifold respectively communicate with the drilling column, a by-pass pipeline of the rotary control head and a by-pass pipeline in the blowout direction of the drilling spool. Due to the arrangement ways of all the manifolds and the mutual opening/closing matching between hydromatic valves and check valves arranged on all the manifolds and the utilization of a drilling fluid pump equipped for a drilling crew at present, the pressure-control drilling operation is realized; and through controlling the automatic shunt manifold for pressure-control drilling in connection making and tripping processes, the fluctuation of bottom hole pressure can be reduced, the control capacity for the bottom hole pressure can be improved, the no-drilling time can be shortened, the drilling cost can be reduced, and the operation incapability caused by a fault of a pressure return pump can be avoided.

Description

technical field [0001] The invention relates to the technical field of pressure-management drilling, in particular to a pressure-management drilling system and a pressure-management drilling method utilizing the pressure-management drilling automatic diversion manifold. Background technique [0002] During drilling in complex formations, conventional drilling techniques are difficult to solve problems such as overflow, lost circulation, pipe sticking, and well wall collapse caused by narrow density windows, which prolong non-drilling time, increase drilling costs, and even threaten the safety of drilling operations. The managed pressure drilling technology can effectively solve technical problems such as overflow in narrow density windows, lost circulation, stuck pipe, and wellbore collapse during drilling in complex formations. [0003] The control goal of MPD is to keep the bottom hole pressure within the set pressure range by presetting the annular pressure; Comprehensiv...

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Problems solved by technology

However, the disadvantage of this method of applying wellhead back pressure is that the method of applying wellhead back pressure with a back pressure pump increases the cost of the well head back pressure pump and its ancillary equipment, which not only increases the operating cost of managed pressure drilling, but also occupies Since the wellhead back pressure pump system is difficult to maintain on site, once a failure occurs, the managed pressure drilling operation cannot be implemented

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