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Method for quickly calculating water content of mixed liquid in oil well shaft

A fast calculation, water cut technology, applied in wellbore/well components, production fluid, earthwork drilling, etc., can solve the problems of sudden change of water cut, long period, and inability to understand in time

Pending Publication Date: 2021-02-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current water content measurement cycle is longer, usually 5-10 days, which leads to sudden changes in water content and cannot be understood in time

Method used

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  • Method for quickly calculating water content of mixed liquid in oil well shaft
  • Method for quickly calculating water content of mixed liquid in oil well shaft
  • Method for quickly calculating water content of mixed liquid in oil well shaft

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] The method for quickly calculating the water content of the mixed liquid in the wellbore of the oil well of the present invention comprises the following steps:

[0041] 1. Referring to Figure 2(b), when the donkey head of the oil pumping unit runs to the top dead center, the floating valve 2 of the oil well pump is about to open from closing, and the fixed valve 4 is about to close after opening, and the upper and lower fluids of the oil well pump plunger are not connected, resulting in The force of the suspension point load includes the gravity of the sucker rod string and the upper and lower fluid pressure of the plunger.

[0042] Swimming valve force balance equation:

[0043] Suspension point load W j1 =W' r +W' L +(p t -p c )A p -p t A r (1)

[0044] W j1 - Static load of suspension point on upstroke, kN

[0045] W' r -The gravity of the suck...

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Abstract

The invention discloses a method for quickly calculating the water content of mixed liquid in an oil well shaft. The method comprises the following steps of through an upper stroke suspension point static load, a lower stroke suspension point static load, wellhead oil pressure, wellhead casing pressure, oil well pump plunger sectional area, density of oil in well liquid, gravitational acceleration, dynamic liquid level depth and density of water in the well liquid, and quickly calculating the water content of liquid in the oil well shaft according to a water content formula. The method has thecharacteristics of low cost, high speed and better utilization of digitalization of a mine field, and the time and the workload for sampling and measuring the moisture content by a distillation method are saved; and for an oil well provided with a digital load sensor, the online water content monitoring cost of equipment such as ultrasonic waves can be reduced.

Description

technical field [0001] The invention belongs to the field of oil recovery engineering, and relates to a method for quickly calculating the water content of mixed liquid in the shaft of an oil well. Background technique [0002] Rod pump oil extraction is the most widely used mechanical oil extraction technology at home and abroad. At present, the number of mechanical oil production wells in the world has exceeded 90% of the total number of production wells, and about 80% of mechanical oil production wells use rod pump pumping mode; in my country, about 80% of production wells use rod pump pumping model. [0003] When the pumping unit is in normal operation, the graph reflecting the variation of the suspension point load with its displacement is called the polished rod (ground) dynamometer diagram, refer to figure 1 . Suspended point loads are divided into static loads, dynamic loads and various friction loads according to their properties. Static load refers to the suspen...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B43/00
CPCE21B47/00E21B43/123
Inventor 韩二涛甘庆明刘汉斌赵春樊松梁毅郭靖雷宇周杨帆杨海涛
Owner PETROCHINA CO LTD
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