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A flow pressure design method for horizontal wells in tight sandstone reservoirs after fracturing and production

A design method and tight sandstone technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of excessive drop of fluid level in horizontal wells, decline in oil production index of horizontal wells, and unreasonable oil recovery systems, etc. question

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for designing flow pressure of horizontal wells for fracturing and production in tight sandstone reservoirs, so as to solve the difficult problem of calculating the reasonable flow pressure of horizontal wells for fracturing and production in tight sandstone reservoirs, and to overcome the unreasonable oil recovery system in the later stage, which leads to The fluid level of the horizontal well drops too fast, resulting in a sharp drop in the oil production index of the horizontal well

Method used

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  • A flow pressure design method for horizontal wells in tight sandstone reservoirs after fracturing and production
  • A flow pressure design method for horizontal wells in tight sandstone reservoirs after fracturing and production
  • A flow pressure design method for horizontal wells in tight sandstone reservoirs after fracturing and production

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Embodiment 1

[0044] In this embodiment, a tight sandstone reservoir fracturing and putting into production horizontal well in the Chang 8 reservoir of Honghe Oilfield is selected. The steps of the reasonable flow pressure method of the tight sandstone reservoir fracturing and putting into production horizontal well of the present invention will be described in detail below in conjunction with the horizontal well. Specifically include the following steps:

[0045] (1) The threshold pressure gradient of the Chang 8 reservoir core in Honghe Oilfield was measured by the constant velocity method, and the threshold pressure gradient of the core was determined to be 0.0346MPa / m.

[0046] (2) Using the changing confining pressure method to evaluate the stress sensitivity of Chang 8 reservoir in Honghe Oilfield, the evaluation result is strong stress sensitivity, and the calculated core deformation coefficient is 0.02MPa -1 .

[0047] (3) The formation pressure of Well HH37P2 is 19.725MPa, the act...

Embodiment 2

[0054] In this implementation, a tight sandstone oil reservoir fracturing and putting into production horizontal well in the Chang 9 reservoir of Honghe Oilfield is selected. The method for reasonable flow pressure of the tight sandstone oil reservoir fracturing and putting into production horizontal well of the present invention will be described in detail below in conjunction with the horizontal well. The method includes Follow these steps:

[0055] (1) The threshold pressure gradient of the Chang 9 reservoir core in Honghe Oilfield was measured by the constant velocity method, and the threshold pressure gradient of the core was determined to be 0.0355MPa / m.

[0056] (2) Using the changing confining pressure method to evaluate the stress sensitivity of Chang 9 reservoir in Honghe Oilfield, the evaluation result is strong stress sensitivity, and the calculated core deformation coefficient is 0.012MPa -1 .

[0057] (3) The formation pressure of Well HH42P1 is 18.27MPa, the ac...

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Abstract

The invention relates to a tight sandstone reservoir fracturing production horizontal well flowing pressure design method, belonging to the technical field of oil / gas well development. The method is characterized in that the starting pressure gradient and the deformation coefficient of a tight sandstone reservoir are determined according to an indoor core flow experiment, the influences of the starting pressure gradient and the deformation coefficient on the production capacity of a horizontal well are considered on the basis of a flow coupling model among the oil reservoir, a crack and a shaft to obtain a tight sandstone oil reservoir fracturing production horizontal well production capacity prediction equation, the production capacity of the horizontal well under different flowing pressure is calculated according to the equation, the goal is to obtain optimum production capacity and the reasonable flowing pressure of the horizontal well is optimized. By considering the influences of the starting pressure gradient and the deformation coefficient of the reservoir on the production capacity of the horizontal well, the method provided by the invention is more compliant to the production characteristic of the tight sandstone oil reservoir and an effective means is provided for the optimization of the reasonable flowing pressure of the horizontal well during development by adopting natural energy.

Description

technical field [0001] The invention relates to a method for designing the flow pressure of a horizontal well that is fractured and put into production in a tight sandstone reservoir, and belongs to the technical field of oil and gas well development. Background technique [0002] Tight sandstone reservoirs are characterized by low permeability, narrow pore throats, and well-developed micro-fractures. Formation fluid seepage in such reservoirs has the characteristics of high threshold pressure gradient, strong stress sensitivity, and prominent nonlinear flow. The effects of non-Darcy factors such as , and stress sensitivity become more obvious as the formation permeability decreases. In tight sandstone reservoirs, reservoir fluid flow must not only overcome the influence of threshold pressure gradient, but also minimize the damage caused by stress sensitivity to reduce permeability. Therefore, it is particularly important to control reasonable flow pressure. However, when s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00E21B43/26
Inventor 邓学峰罗懿刘岳龙卢瑜林李克智屈玉凤符伟兵
Owner CHINA PETROLEUM & CHEM CORP
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