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Shale gas well pressure-yield-variable stage production system adaptability judgment method

A technology for shale gas wells and discrimination methods, which is applied in earthwork drilling, wellbore/well components, special data processing applications, etc., and can solve problems such as inability to obtain unobstructed flow, inability to use, and inability to establish productivity equations

Active Publication Date: 2020-10-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the production characteristics of variable pressure and variable production in the early stage of shale gas wells, the linear correlation of the binomial productivity equation indicator curve obtained from the shale gas well productivity test is not high, and even the slope is negative, so the productivity equation cannot be established. Unable to obtain unobstructed flow, the empirical proration coefficient method and gas production index curve method of unobstructed flow cannot be used
In addition, the pressure drop rate method cannot be used in shale gas wells due to the large pressure difference affected by the buried depth.
The current shale gas well production system mainly considers the production arrangement, but does not consider whether the gas well matches the reservoir conditions and whether the production allocation is scientific and reasonable

Method used

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  • Shale gas well pressure-yield-variable stage production system adaptability judgment method

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Experimental program
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Effect test

Embodiment 1

[0031] In this example, the judgment is made on the matching between the production system and the reservoir of the production wells in the Weiyuan shale gas field, including the following steps:

[0032] 1. Screen out wells that have been put into production for more than 1 year to 1.5 years and have good production dynamics: typical wells whose daily gas production decline rate does not exceed 60% from the peak daily gas production to the end of 1 year are standard wells; collect standard wells and those to be identified Well horizontal section length, number of fracturing stages, and fracturing scale data;

[0033] Table standard wells and basic data statistics of wells to be discriminated

[0034]

[0035] 2. Make the material balance time-production normalization pseudo-pressure relationship curve of the standard well, and obtain the respective pseudo-production index values ​​J p , linear flow end time t elf ;

[0036] Calculate material equilibration time

[0037...

Embodiment 2

[0047] A method for judging the adaptability of a production system in a shale gas well during a stage of variable pressure and variable production, comprising the following steps:

[0048]1. Screen out the standard wells in the well area;

[0049] 2. Collect data on horizontal section length, number of fracturing stages, and fracturing scale of standard wells and wells to be identified;

[0050] 3. Make the material balance time-production normalized pseudo-pressure relationship curve of the standard well and the well to be discriminated, and obtain the pseudo-production index value J p , linear flow end time t elf ;

[0051] 4. Compare the quasi-production index values ​​of target wells and standard wells with the same fracturing technology and the difference in length of the horizontal section is not more than 10% of the length of typical horizontal wells J p , linear flow end time t elf , to determine whether the production system matches the reservoir conditions and w...

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Abstract

The invention discloses a shale gas well pressure-yield-variable stage production system adaptability judgment method. The method includes the following steps that standard wells in a well area are screened out; horizontal section length, fracturing section number and fracturing scale data of the standard wells and to-be-judged wells are collected; a material balance time-yield regularization pseudopressure relation curve of the standard wells and the to-be-judged wells is drawn, and pseudoproduction index values and linear stream end time are obtained; and the pseudoproduction index values and linear stream end time of target wells and the standard wells with the difference between the horizontal section lengths not larger than 10% of the lengths of horizontal typical wells and the same fracturing process are compared, and whether a production system of the target wells is matched with reservoir conditions or not and whether the production system is reasonable or not are obtained. Multiple reservoir parameters difficult to obtain are not needed, reservoir parameter clusters obtained through analysis are used for analyzing the rationality of the production system, and guidance canbe provided for adjusting the production system of the shale gas horizontal wells in the next step.

Description

technical field [0001] The invention relates to a method for judging the adaptability of a production system in a shale gas well variable pressure and production stage, and belongs to the research field of oil and gas field development and application methods. Background technique [0002] The daily gas production of shale gas wells is high in the early stage of production. Most of the shale gas wells at home and abroad are in the production stage of variable pressure and variable production. Scheduled production. The whole life cycle of shale gas wells has the following characteristics: (1) the accumulative production in the early stage of production accounts for more than half of the recoverable reserves of shale gas wells; (2) the production time is long during the low production period, and the contribution of gas well production per unit time is relatively low; (3) The stress sensitivity characteristics of horizontal multi-stage fracturing shale gas wells are ubiquitou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/26G06F30/20
CPCE21B49/00E21B43/26G06F30/20
Inventor 钟思存赵素惠李军袁翠平刘若林蔡默伦刘俊海
Owner BC P INC CHINA NAT PETROLEUM CORP