Method for determining whether liquid accumulation exists in gas well or not and determining liquid accumulation degree

A technology for gas wells and liquid accumulation, which is applied in determining whether gas wells accumulate liquid and the degree of liquid accumulation, and in the field of liquid accumulation gas wells, can solve the problems of expensive implementation process, unfavorable low-cost development of gas fields, etc., and achieves low cost, simple method and principle. reliable results

Active Publication Date: 2015-04-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem that the implementation process of the existing gas well liquid accumulation test method is relatively expensive, whi

Method used

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  • Method for determining whether liquid accumulation exists in gas well or not and determining liquid accumulation degree
  • Method for determining whether liquid accumulation exists in gas well or not and determining liquid accumulation degree
  • Method for determining whether liquid accumulation exists in gas well or not and determining liquid accumulation degree

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Embodiment 1

[0030] This embodiment provides a method for determining whether a gas well has fluid accumulation and the degree of fluid accumulation, including the following steps,

[0031] Step 1: Check the production data of the gas well and obtain the oil pressure when the gas well is shut down , sleeve pressure , gas density and liquid density ;

[0032] Step 2: Using the data measured in Step 1, calculate the liquid level difference h between the liquid column in the oil pipe and the liquid column in the annular space of the oil jacket, as shown in figure 1 shown;

[0033] Calculate the liquid level difference h between the depth of the liquid column liquid level 4 in the tubing 1 and the depth of the liquid column liquid level 3 in the oil casing annulus in the casing 2, through the following calculation,

[0034] (3)

[0035] In the formula: ——liquid density, kg / ;

[0036] ——Gas density, kg / ;

[0037] g—gravitational acceleration, m / ; ...

Embodiment 2

[0048] In the above embodiment, the method for determining whether the gas well has fluid accumulation and the degree of fluid accumulation may also include:

[0049] Step 4: Measure and calculate the liquid level difference h multiple times, and draw the liquid level difference h obtained multiple times into a curve corresponding to time, so as to prove the change law of the liquid accumulation degree in the wellbore of the gas well and determine the gas production measures of the gas well.

[0050] For example, in the Sulige gas field, when the height of the effusion, that is, the height of the liquid level difference h calculated in the above-mentioned embodiment is less than 500m, it is normal. According to the calculation, before the height of the liquid accumulation exceeds 500m, liquid drainage measures should be taken. Chemical agents can be added to drain the gas to reduce the amount of liquid accumulation and avoid gas well crushing.

[0051] The following will be de...

Embodiment 3

[0053] Oil pressure of a gas well during shut-in 5.8MPa, sleeve pressure is 7.2MPa, liquid density 1010kg / , gas density 610 kg / . Substitute the above information into the formula:

[0054]

[0055] The liquid column difference h between the tubing and the casing annulus is calculated to be 350m.

[0056] If the local allowable height of effusion is 500m, then in this case, normal gas production can still be carried out, and there is no need to clear the effusion.

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Abstract

The invention relates to the determination of the liquid level height difference of a well casing of a gas well in the field of gas field development, provides a method for determining the liquid level height difference of the well casing of a liquid accumulation gas well by utilizing the communicating vessel principle, and particularly relates to a method for determining whether liquid accumulation exists in a gas well or not and determining the liquid accumulation degree. According to the method, firstly, the oil pressure, the casing pressure, the gas density and the liquid density of the gas well during well closing are obtained; secondly, the accumulation liquid height difference of the well casing of the gas well is obtained through the calculation of the oil pressure, the casing pressure, the gas density and the liquid density, and the liquid accumulation and the liquid accumulation degree are judged through the accumulation liquid height difference. The accumulation liquid height difference of the well casing of the gas well can be determined through inputting and obtaining oil pressure and casing pressure data of the gas well after the well closing, only well closing oil pressure and casing pressure data needs to be specified, and a well testing instrument does not need to be placed into the well bottom. Compared with the prior art, the method has the advantages that the method is simple and convenient, and the cost is lower.

Description

technical field [0001] The invention relates to the field of gas field development, and relates to the determination of the liquid level difference in the wellbore of a gas well. It is a method for determining the liquid level difference in the wellbore of a liquid-loaded gas well by using the principle of a connector, and specifically relates to a method for determining whether a gas well is liquid-loaded and the degree of liquid-loaded The method is suitable for liquid-loaded gas wells where the tubing and casing annulus are connected. Background technique [0002] During the development process of gas reservoirs at home and abroad, formation water is produced to varying degrees. If the produced water cannot be discharged from the wellbore of the gas well in time, it will accumulate at the bottom of the gas well, resulting in fluid accumulation. [0003] After the gas well has fluid accumulation, on the one hand, it increases the flow resistance of the gas, reduces the ga...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
CPCG06Q50/06
Inventor 马海宾王惠梁博羽梁倚维卢文伟李在顺茹志娟高仕举田发国韩勇曹毅李彦彬
Owner PETROCHINA CO LTD
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