Low-differential-pressure synchronous dual-fixed-valve deep-well pump

Abstract

The invention discloses a low-differential-pressure synchronous dual-fixed-valve deep-well pump applied to the petroleum industry, which is used for extracting crude oil from a mechanical oil production well. The low-differential-pressure synchronous dual-fixed-valve deep-well pump comprises a pump barrel, an upper fixed valve and a lower fixed valve, wherein the upper fixed valve and the lower fixed valve are both installed below the pump barrel and are connected through a link rod. Because the link rod is designed between the upper fixed valve and the lower fixed valve, the synchronous opening and closing of the double fixed valves are ensured, the lower fixed valve ensures that the flow velocity of well fluid is greatly reduced, and the service life of the oil well pump is prolonged. The invention effectively solves the problems of lagged opening and closing of the fixed valves, low depth ratio of the pump, high differential pressure inside and outside the pump barrel, increased clearance between a plunger piston and the pump barrel, increased pump leakage and the like in the traditional deep-well pump. The invention increases pump efficiency, prolongs pump inspection period, obviously reduces production cost and has obvious economic benefits.

Description

technical field [0001] The invention belongs to oil production equipment in the petroleum industry, in particular to a low differential pressure synchronous double-fixed Val deep well pump, which is used for extracting crude oil in mechanical oil production wells. Background technique [0002] The use of tubular pumps in small pump deep pumping wells in medium and low permeability reservoirs is still the main oil production method in the petroleum industry at present. In the actual application of deep pumping wells, there are mainly the following three problems: 1. Low pump efficiency, mainly due to The sinking degree is small, and part of the plunger stroke cannot reach the pressure difference of the fixed valve opening, resulting in increased stroke loss. 2. In deep pumping wells, there are many lying wells caused by pump damage factors such as Vulcan leakage. 3. When pumping, the pressure difference between the inside and outside of the pump barrel is large, the gap betw...

AI Technical Summary

Problems solved by technology

[0002] The use of tubular pumps in small pump deep pumping wells in medium and low permeability reservoirs is still the main oil production method in the petroleum industry at present. In the actual application of deep pumping wells, there are mainly the following three problems: 1. Low pump efficiency, mainly due to The submergence is small, and part of the plunger stroke cannot reach the pressure difference of the fixed valve opening, resulting in increased stroke loss

2. In deep pumping wells, there are many lying wells caused by pump damage factors such as Faner puncture leakage

3. When pumping, the pressure difference between the inside and outside of the pump barrel is large, the gap between the plunger and the pump barrel increases, and the leakage increases

However, the pressure difference required to open the double fixed valve increases, and the pump efficiency decreases to a certain extent.

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