An Electro-hydraulic Proportional Control System of a Pressure Delivery Device

Abstract

The invention discloses an electro-hydraulic proportion control system of a pressure delivery device. Power is supplied by using a power distribution cabinet and input to a matching electric cabinet to input a ramp signal into the electro-hydraulic proportion control system, an amplified electric signal is acted on a proportion electromagnet through a proportion amplifier, a valve core of a main valve of an electromagnetic proportion valve is driven to move to allow an oil port of the main valve to output flow rate in proportion, the liquid pressure P, the flow rate q and the flowing directioncontinuously change along with the electric signal in proportion, so that the effective control of a double-stage hydraulic cylinder is achieved, and an oil pipe sealing device is delivered to a preset position in a pressure state; a bidirectional locking function of the double-stage hydraulic cylinder is achieved by two groups of liquid control one-way valves, and when the electromagnetic proportion valve is neutral, it is ensured that the double-stage hydraulic cylinder can be accurately positioned and stopped. Compared with a normal reversing valve which is manually adjusted and controlledto be on and off, the controlling level of the hydraulic system is greatly improved through electric signal long-distance controlling, precision and controllable position are initially achieved, thedelivery efficiency is high, and manual intensity is low.

Description

technical field [0001] The invention relates to a pressurized delivery device for a water injection well in an oil field, in particular to an electro-hydraulic proportional control system for a pressurized delivery device. Background technique [0002] Oilfield water injection wells are prone to clogging in the middle and later stages of development, resulting in high water injection pressure, and it is necessary to increase the water injection rate through acidification to remove plugging. In order to reduce the construction cost, the technology of plugging removal by acidizing without moving the string is usually adopted. Most of the water injection wells in the oilfield use 350-type Christmas trees. Due to the low pressure resistance level of wellhead devices, 700-type cement pump trucks pressurize to 30MPa. The fracturing truck can pressurize to 40MPa, but it has exceeded the design limit of the Christmas tree. [0003] In order to solve the contradiction between the p...

AI Technical Summary

Problems solved by technology

The pressure delivery device usually uses a manual reversing valve to change the direction of the oil circuit to deliver the tubing packer to the predetermined position inside the production string, which has low control accuracy, high labor intensity, low reliability and low success rate

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