Wellhead Backpressure Control System and Wellhead Backpressure Control Method for Managed Pressure Drilling

Abstract

The invention provides a wellhead back pressure controlling system of managed pressure drilling and a wellhead back pressure controlling method. The wellhead back pressure controlling system of the managed pressure drilling comprises a slush pump, a managed pressure automatic choke manifold, a liquid-gas separator, a slush pool, a rotary blowout preventer and a slush diversion manifold system, wherein the slush pool is respectively connected with the slush pump, the managed pressure automatic choke manifold and the liquid-gas separator. The slush diversion manifold system comprises a branch path I, a branch path II, a branch path III, a branch path IV and a branch path V, wherein the branch path I, the branch path II, the branch path III and the branch path IV are connected through a cross t3, the branch path V is connected with the branch path II through a tee t5, and the branch path V and the branch path IV are connected through a tee t8. The wellhead back pressure controlling system of the managed pressured drilling is adopted by the wellhead back pressure controlling method. The slush diversion manifold system replaces a back pressure pump system, operational cost is reduced, a site area is saved, and high-fault factors are removed.

Description

technical field [0001] The invention relates to the field of drilling for petroleum exploration and development, in particular to a wellhead back pressure control system and a wellhead back pressure control method for managed pressure drilling. Background technique [0002] In oil and gas development, more and more operations are performed in complex formations. Generally, the difference between collapse pressure and fracture pressure in complex formations is small or the safe density window of mud is narrow, and blowout, leakage, sticking and collapse accidents are often encountered when conventional drilling technology is used. In order to carry out drilling operations safely and reduce accidents, managed pressure drilling technology is often used. One of the methods of MPD technology is to indirectly control the bottom hole pressure by controlling the wellhead back pressure. One of its core technologies and equipment is the pressure-controlled automatic choke manifold. ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a wellhead back pressure control system and a wellhead back pressure control method for managed pressure drilling to solve the problem of many faults caused by relying on a back pressure pump to complete the wellhead back pressure

The present invention can also solve the problem that the back pressure pump system occupies a large area

The invention can also solve the problems of high cost and inconvenient operation of using the back pressure pump

The invention can also solve the problem that the back pressure pump system cannot work for a long time during the grouting operation

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