A new oil and gas downhole friction and drag reduction device

Abstract

The invention provides a novel petroleum and natural gas underground anti-friction and resistance-reduction device. The novel petroleum and natural gas underground anti-friction and resistance-reduction device is characterized by mainly comprising a first connector, a second connector, a spring, an outer-layer tube, a hexagonal kelly, an axial circular bead, a cycloid shaft, first annular space, a first cavity, an eccentric circular bead, a constant-pressure channel, a second cavity and second annular space; when the novel petroleum and natural gas underground anti-friction and resistance-reduction device just starts to work, the spring between the eccentric circular bead and the second connector is in the slack state; in the working process, the second cavity is kept communicated with the first annular space through the constant pressure channel, the pressure is constant all the time, the pressure of the first cavity and the elastic performance of the spring are periodically changed, the hexagonal kelly of the novel petroleum and natural gas underground anti-friction and resistance-reduction device can be accordingly pushed to perform periodical reciprocating movement in the axial direction through changes in the pressure difference between the first cavity and the second cavity and changes in the elastic potential energy of the spring, static friction between a drilling tool and the well wall is accordingly eliminated, and the petroleum and natural gas underground friction resistance is effectively reduced. The novel petroleum and natural gas underground anti-friction and resistance-reduction device is suitable for the technical field of petroleum and natural gas drilling engineering.

Description

technical field [0001] The invention relates to the technical field of reducing friction and drag in extended-reach wells and increasing mechanical speed, in particular to a novel oil and gas downhole friction and drag reducing device. Background technique [0002] With the development of directional well and horizontal well drilling technology, extended reach wells appeared. At present, there are two definitions of extended-reach wells: one refers to directional wells or horizontal wells whose sounding depth is equal to or greater than 2 times the vertical depth, and when it is greater than 3 times, it is called a super-extended-reach well It was proposed by Norway at the conference; the other refers to directional wells or horizontal wells with horizontal displacement equal to or greater than 2 times the vertical depth. This definition mainly comes from the so-called extended-reach wells of BP Company in the United Kingdom and ARCO Company in the United States. [0003] T...

AI Technical Summary

Problems solved by technology

What needs to be explained is: (1) The structure of "a downhole tool for reducing friction and increasing amplitude" is too complicated, so it is difficult to ensure that the tool can work stably in the environment of several kilometers downhole; (2) the main functions of the above two tools It is to form the pulse jet of drilling fluid, which can effectively improve the flow field at the bottom of the well, and significantly improve the efficiency of rock breaking and rock carrying at the bottom of the well. tool) or static valve plate (an anti-friction and drag reduction tool based on pulse excitation), so it can hardly drive the axial movement of the entire drilling tool, resulting in a small axial vibration of the entire drilling tool; The effect of friction reduction tools on extended reach wells is not obvious and needs to be improved

Images