Pressure device of petroleum drilling machine

Abstract

The invention discloses a pressure device of a petroleum drilling machine. The pressure device comprises a transmission part and a hydraulic control part, wherein according to the transmission part, steel wire ropes on a right-handed rotation hydraulic winch and a left-handed rotation hydraulic winch respectively pass through a base rope reversing pulley, an oil derrick rope reversing pulley and a shackle and then is connected to a sling ear plate on a top driving assembly; the hydraulic control part comprises an electronic control variable pump which is arranged on a hydraulic pressure station and is communicated with a main control valve, the main control valve is communicated with a leading proportion hydraulic control guide valve, and a connector T of the main control valve is communicated with a main overflow valve which is communicated with a long-distance adjusting guide valve; liquid outlets A and B of the main control valve are respectively and correspondingly communicated with liquid inlets A and B of the two hydraulic motors; the two hydraulic motors are respectively connected with a group of hydraulic control one-way valves in parallel, and a group of electromagnetic directional valves are communicated between each group of hydraulic control one-way valves and the liquid outlet B of the main control valve. The pressure device of the petroleum drilling machine is simple in structure, convenient to control and low in manufacturing cost, and the operation efficiency and the safety of the pressure device are improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and relates to a pressurizing device for drilling tools of petroleum drilling rigs. Background technique [0002] In the development of onshore and offshore oil and gas resources, due to the need for efficient development of reservoirs, extended-reach horizontal wells or extended-reach deviated wells are often drilled, and the ratio of the horizontal section to the vertical section of the entire wellbore is often above 2. As the wellbore trajectory is inclined or the length of the horizontal section is greatly increased, the vertical gravity of the drill string or casing is greatly reduced in the inclined and horizontal state. On the one hand, in order to overcome the frictional resistance of the pipe wall and the WOB required for drilling, it is necessary to apply downforce to the drill string through top drive; on the other hand, in order to overcome the frictional resistance of the w...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pressurizing device for drilling tools of oil drilling rigs, which solves the problems in the prior art of increasing the weight of the counterweight and increasing the vertical gravity of the downward pressure, low work efficiency and heavy equipment

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