A hydraulic power system for downhole equipment and downhole equipment

Abstract

A hydraulic power system for downhole equipment, including: a first motor, a first hydraulic pump, a second hydraulic pump, a first main oil circuit, a second main oil circuit, a switching control module and a first execution module; The motor has a first output shaft and a second output shaft, the first output shaft drives the first hydraulic pump, the oil outlet of the first hydraulic pump is connected to the input end of the first main oil circuit; the second output shaft drives the second hydraulic pump, The oil outlet of the second hydraulic pump is connected to the input end of the second main oil circuit; the first executive module is connected to the output end of the first main oil circuit; the displacement of the first hydraulic pump is smaller than the displacement of the second hydraulic pump; switching The control module is connected between the first main oil circuit and the second main oil circuit, and is used to adjust the working pressure and The movement speed of the first executive module. The present application also provides a downhole equipment.

Description

technical field [0001] This article relates to the technical field of geological exploration, especially a hydraulic power system for downhole equipment and downhole equipment. Background technique [0002] Due to the particularity of the operating environment and operating requirements, some downhole equipment used for geological exploration and testing have higher requirements for force and speed control. For example, in order to improve the adaptability of the coring instrument to the formation, during the operation of the large-diameter coring instrument, the control accuracy of the drilling pressure and the forward speed of the drill bit is relatively high; moreover, under different working conditions, the drilling The pressure and velocity ranges are very wide. When performing coring operations in complex formations, the control requirements for drilling pressure and speed are higher. [0003] However, the existing hydraulic systems cannot meet the control requiremen...

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Problems solved by technology

[0003] However, the existing hydraulic systems cannot meet the force and speed control requirements of downhole operations

For example, the current hydraulic system cannot fully meet the requirements of drilling pressure and drilling speed in large-diameter coring operations, and it is easy to get stuck in the process of coring; when a stuck drill occurs, the force to retract the drill bit is small and the speed is slow , it is easy to damage the coring instrument; moreover, the drilling speed cannot be effectively controlled, resulting in low coring efficiency

In addition, the reliability of the current hydraulic system is generally poor. Once a problem occurs, it will seriously affect the performance of the coring instrument.

Due to the insufficient performance of the current hydraulic system, it often causes sticking of downhole instruments such as drill bit sticking and unrecoverable drilling, and instrument salvage will seriously waste time and cost

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