Universal shaft connector of double-layer structure power drilling tool

Abstract

The invention relates to a universal shaft connector of a double-layer structure power drilling tool. The universal shaft connector is composed of an upper joint, a shell, a transmission ball, a screwjoint and a sealing plug, the screw joint is connected with a screw rotor, the upper joint is connected with the shell, the other end is connected with an inner pipe, the transmission ball and the sealing plug are arranged between the screw joint and the shell, the transmission ball can achieve torque transmission, a gap is formed between the transmission ball and the shell in the radial direction, and the screw connector can swing around the upper joint through a spherical contact face; and Fluid in the inner pipe can flow through the interior of the screw rotor through a flow channel in thecardan shaft to be transmitted to a lower drilling tool, and liquid in the outer pipe flows through a cavity between the screw stator and the rotor from the exterior of the cardan shaft to push the rotor to rotate or be sucked. According to the connecting cardan shaft, an internal flow channel is provided on the basis of achieving the functions of an existing cardan shaft, the problem that a screw tool cannot be used for the double-layer pipe process is solved, and the connecting cardan shaft has the advantages of being simple in structure and long in service life.

Description

technical field [0001] The invention relates to the operation of a double-layer pipe screw tool in the petroleum field, in particular to a cardan shaft connector of a double-layer structure power drilling tool. Background technique [0002] Compared with conventional positive circulation drilling methods, double-tube reverse circulation drilling has high drilling speed, faster bottom hole cleaning, and higher cuttings migration efficiency, which can reduce the loss of circulating medium to protect oil and gas reservoirs and reduce drilling costs. The basic principle can be briefly summarized as that the drilling fluid is pumped in from the annular space of the double-layer drill pipe, flows through the reverse circulation drilling bit, and carries cuttings from the inner pipe back to the ground. Turbine pumps are widely used in reverse circulation drilling double-tube process because of their internal flow channels, but the pump pressure of turbo pumps is low and often requi...

AI Technical Summary

Problems solved by technology

However, there is currently no cardan shaft with an internal closed flow channel design, which makes the screw drilling tool not suitable for double-layer pipe and double-layer drill pipe technology, so it is urgent to design a kind of internal flow channel suitable for double-layer pipe Cardan shaft for screw tools

Images