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Old well crack synchronous re-fracturing production increasing method

A technology for repeated fracturing and old wells, applied in the field of oil fracturing, which can solve the problems of low overall production and not considering multiple wells

Pending Publication Date: 2021-02-05
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for synchronous repeated fracturing and stimulation of old well fractures, which is used to solve the technical problem that multiple wells are not considered in the existing fracturing technology, and the overall production is low

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with accompanying drawing:

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, and therefore cannot be construed as limiting the present invention; the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be construed as indicating or implying relative importance; in addition, unless otherwise Clearly stipulated and limited, the terms "installation"...

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Abstract

The invention discloses an old well crack synchronous re-fracturing production increasing method. The old well crack synchronous re-fracturing production increasing method is different from a traditional method of fracturing only for one well each time, and is used for fracturing two or more adjacent oil wells in an oil reservoir area at the same time. According to the old well crack synchronous re-fracturing production increasing method, firstly energy is integrally supplemented to a plurality of wells, and the formation pressure of the oil reservoir area instead of a single well point is improved; secondly, the multiple adjacent wells are synchronously fractured, fracturing fluid is injected, the formation pressure near wellbores and cracks is remarkably increased, a stress shielding effect is generated, and the situation that when one well is fractured, the cracks are unidirectionally protruded or excessively extended to communicate with the cracks of the other well is avoided; andthirdly, the oil wells are synchronously fractured, the pressure around the wellbores and the cracks can synchronously rise, stress interference is generated in the oil reservoir areas between the oilwells, complex network fractures can be generated in the areas, so that oil reservoir fracturing is more sufficient, the distance from crude oil in the stratum to the cracks is shortened, and the yield of the fractured oil wells is higher.

Description

【Technical field】 [0001] The invention belongs to the technical field of petroleum fracturing, and in particular relates to a production stimulation method for synchronous repeated fracturing of fractures in old wells. 【Background technique】 [0002] In low-permeability oil fields, due to poor reservoir physical properties, oil wells usually require hydraulic fracturing to obtain industrially valuable production. However, as the production time prolongs, the remaining crude oil in the formation near the fracture becomes less and less, or the flow conductivity of the fracturing fracture is blocked and its conductivity decreases, and the production of the oil well will drop significantly. At this time, it is necessary to restore the productivity of the oil well by implementing refracturing. [0003] At present, the usual practice is to select oil wells with potential for increasing production, and select parameters such as proppant dosage, construction displacement, and total...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267G06F30/20E21B43/30
CPCE21B43/26E21B43/267G06F30/20E21B43/30
Inventor 吴甫让慕立俊齐银达引朋王飞卜军杨军侠杨海楠刘明
Owner PETROCHINA CO LTD
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