Method and device for determining leakage rate of oil casing annulus of gas well

A leakage rate and oil-casing annulus technology, applied in the field of gas well oil-casing annulus leakage rate calculation, can solve the problem of high cost

Active Publication Date: 2014-04-23
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In foreign countries, Scanwell Company of Norway has developed a set of special equipment, which can measure the depth and leakage rate of downhol

Method used

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  • Method and device for determining leakage rate of oil casing annulus of gas well
  • Method and device for determining leakage rate of oil casing annulus of gas well
  • Method and device for determining leakage rate of oil casing annulus of gas well

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] The invention discloses a method for determining the leakage rate of annulus of a gas well oil casing, such as figure 1 As shown, the method includes:

[0027] Step S101, collecting gas well basic data and annulus pressure relief data, the gas well basic data including annular wellhead pressure and annulus protection fluid density;

[0028] Step S102, determining the gas temperature at the leakage point in the tubing and the gas pressure at the leakage...

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Abstract

The invention provides a method and a device for determining a leakage rate of an oil casing annulus of a gas well. The method comprises the steps of: acquiring basic data and annulus pressure relief data of the gas well, wherein the basic data of the gas well comprise an annulus wellhead pressure and an annulus protection liquid density; determining a gas temperature of a leakage point in an oil pipe and a gas pressure of the leakage point in the oil pipe based on the annulus wellhead pressure and the basic data of the gas well; determining a wellhead leakage rate based on the annulus pressure relief data and a surface pipeline hole leakage model; determining a gas well annulus leakage rate equation based on the wellhead leakage rate and the gas pressure of the leakage point in the oil pipe so as to determine the leakage rate of the oil casing annulus of the gas well. According to the method and the device for determining the leakage rate of the oil casing annulus of the gas well, the leakage rate of the oil casing annulus can be calculated by utilizing the daily production data of the gas well and the pressure relief parameters of the oil casing annulus, and the shortage that the leakage rate of the oil casing annulus of the gas well cannot be calculated currently is covered.

Description

technical field [0001] The invention relates to the field of gas recovery engineering, in particular to a method for calculating the leakage rate of annulus of a gas well casing. Background technique [0002] At present, with the continuous development of natural gas exploration and development, a large number of high-temperature, high-pressure, acidic medium gas wells have been put into trial production or put into production, and the ensuing gas well integrity problems have become increasingly prominent. The integrity requirement of a gas well is to ensure that uncontrolled overflow of subsurface fluids does not occur through management and technical means during the entire life. In the event of an integrity failure, the downhole natural gas will enter the oil casing annulus, that is, the annulus is under pressure, and the severe case may lead to abnormal pressure in the annulus, and even cause downhole natural gas to leak to the ground and explode, endangering the safety ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王云李文魁李隽
Owner PETROCHINA CO LTD
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