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Method for evaluating open-flow capacity of low-permeability gas reservoir gas well

An unblocked flow, gas well technology, applied in instruments, complex mathematical operations, data processing applications, etc., can solve the problems of long production test time, high cost, poor adaptability, etc.

Pending Publication Date: 2021-05-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For low-permeability gas reservoirs, due to the long production test time, large number of wells, and high cost, the gas wells with production test data are limited and the adaptability is poor

Method used

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  • Method for evaluating open-flow capacity of low-permeability gas reservoir gas well
  • Method for evaluating open-flow capacity of low-permeability gas reservoir gas well
  • Method for evaluating open-flow capacity of low-permeability gas reservoir gas well

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This embodiment provides a method for evaluating the open flow rate of a gas well in a low-permeability gas reservoir, including the following steps:

[0048] S1, Optimal productivity testing method: At present, common productivity testing methods include systematic well testing (back pressure testing), isochronous well testing, corrected isochronous well testing and one-point well testing. Each productivity testing method has its own pros and cons. A large amount of natural gas is vented during the system well test, which is a big waste; the isochronous well test takes too long to stabilize the pressure, which is not conducive to the economical and efficient development of the gas field; although the modified isochronous test shortens the test time and reduces the A certain cost, but for low permeability gas fields, there is still a long pressure stabilization time, and normal production cannot be performed during the test period; the one-point well test only needs one...

Embodiment 2

[0061] On the basis of Embodiment 1, further, the acquisition of the parameters of the one-point method production capacity formula in the step S2 specifically includes:

[0062] a, Acquisition of original formation pressure: The average daily gas production 30 days before the gas well is put into production is selected as the initial gas production of the gas well.

[0063] b. Acquisition of initial gas production of gas wells: According to the development experience of low-permeability gas fields, wellhead casing pressure and production tend to be stable 30 days after gas wells are put into production, so the average daily gas production 30 days before gas wells are selected as the initial gas production of gas wells.

[0064] c. Acquisition of bottomhole flow pressure: According to the Cullender-Smith static gas column method, the well depth is divided into two parts, from the wellhead to the midpoint and from the midpoint to the bottom of the well, and the bottomhole pressu...

Embodiment 3

[0071] In this example, the typical block M of the paleo-low-permeability carbonate gas reservoir in the Jingbian gas field is taken as the target to be tested, and the unobstructed flow rate of all gas wells in the block is verified, and a method for evaluating the unobstructed flow of gas wells based on the conventional production data at the initial stage of the gas well is provided. The flow method includes the following steps (taking Well X in Block M as an example):

[0072] Step 1) Optimize productivity well testing method

[0073] In view of the long development time, heavy production tasks, and rich and comprehensive test data of the Jingbian Gas Field, combined with the low porosity and low permeability reservoir physical properties of the Jingbian Gas Field, and comprehensively considering the adaptability of different productivity testing methods, the one-point method was selected as the evaluation The production method of gas wells in Jingbian gas field.

[0074]...

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Abstract

The invention provides a method for evaluating the open-flow capacity of a gas well of a low-permeability gas reservoir by using early production materials. The method comprises the following steps of: S1, optimizing a productivity well testing method: taking a one-point method as a method for evaluating the productivity of the gas well; s2, obtaining one-point method productivity formula parameters; s3, the gas well verification open flow capacity is calculated; S4, according to the calculation result of the step S3, the gas well productivity under the current pressure is evaluated, and gas well production allocation is guided. According to the novel method for evaluating the gas well and verifying the open-flow capacity by utilizing the initial conventional production materials of the gas well, the open-flow capacity of the gas well can be quickly, quickly and accurately calculated in combination with an empirical formula for testing the productivity of the gas field. Under the condition that gas field development and production are not affected, the testing time can be greatly shortened, the testing cost is reduced, and meanwhile resource waste is avoided.

Description

technical field [0001] The invention belongs to the field of gas field development, and in particular relates to a method for evaluating the open flow rate of gas wells in low-permeability gas reservoirs. Background technique [0002] The open flow rate of a gas well is defined as the gas production at the wellhead when the bottomhole flow pressure is 1 atmosphere. Gas well open flow plays a very important role in gas field development. On the one hand, gas well open flow is an important basis for gas well production allocation. On the other hand, it is an important index to measure gas well production capacity. [0003] The evaluation of the open flow rate of gas wells was first obtained by direct testing of wellhead venting. With the continuous development of technology, the commonly used productivity testing methods mainly include systematic well testing (also called back pressure testing), isochronous well testing, and corrected isochronous testing. wells and one-point ...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06G06F17/11
CPCG06Q10/0639G06Q50/06G06F17/11
Inventor 曹宸瑜兰义飞伍勇何磊张建国文开丰高永飞蔡兴利田敏谢姗艾庆琳刘俊袁继明朱长荣黄琼杨生柱李思颖
Owner PETROCHINA CO LTD
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