Drilling fluid circulating system

Abstract

The invention relates to a drilling fluid circulating system. A valve I and a valve III of a drill floor valve group are connected to a low vertical pipe in series, the valve I is located at the upperpart, a valve II and a valve IV are connected to a high vertical pipe in series, the valve II is located at the upper part, and the valve I and the valve III are connected with the valve II and the valve IV through a valve V; a ground valve group comprises a valve VI and the valve XII, an outlet pipe of a No.1 pump sequentially passes through the valves VI-XII to be connected with a right groundpipe, and an outlet of the right ground pipe is connected with the lower end of the lower vertical pipe; an outlet pipe of a No.3 pump sequentially passes through the valve VIII and the valve IX to beconnected with a left ground pipe, and an outlet of the left ground pipe is connected with the lower end of the high vertical pipe; an outlet pipe of a No.2 pump is connected with the valve VII, an outlet of the valve VII is connected with the valve X and the valve XI through a tee joint respectively, the other end of the valve X is connected with a bypass port of a four-way joint of an inlet ofthe valve IX, and the other end of the valve XI is connected with a bypass port of a four-way joint of an inlet of the valve XII. According to the system, slurry can be conveyed through the vertical pipes with different heights, slurry pumps can be reasonably switched, and normal displacement and pumping pressure are guaranteed.

Description

technical field [0001] The invention relates to a valve for an oil drilling rig, in particular to a drilling fluid circulation system, and belongs to the technical field of valves for an oil drilling rig. Background technique [0002] During the drilling process, one or more mud pumps spray high-pressure fluid to the bottom of the well through manifolds, gate groups, hoses, drilling tools and drill bit water holes, forming high-pressure fluid to wash the bottom of the well and dislodging the solids in the wellbore. Phase particles are carried out. The fluid drilling fluid participating in the circulation has the following functions: one is to clean the bottom of the well, suspend and carry cuttings, and keep the borehole clean; the other is to balance the formation pressure, stabilize the well wall, and prevent well collapse, blowout, and lost circulation; 1. To help the drill bit break rocks; 4. To transmit power for downhole dynamic drilling tools; 5. To cool the drill bi...

AI Technical Summary

Problems solved by technology

If the sub-driller enters the high-pressure area to switch the valve under the pressure-suppressed state, the leakage of the valve will pose a threat to the personal safety of the sub-driller, posing a safety hazard

Moreover, it is difficult to open the valve and the opening speed is slow when it is under pressure, which may easily lead to gate erosion

[0007] In order to prevent heavy objects from smashing the screw rod of the valve, there is a valve stem guard outside the screw rod. The valve stem guard protects the screw rod, and at the same time, it also makes it difficult to distinguish the open and closed states of the valve.

If the valve is in a half-open state, it is easy to affect the mud flow, and even cause erosion to the gate

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