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Limited penetration perforating methods for oilfield applications

A technology of perforating bullets and permeability, applied in earthwork drilling, wellbore/well components, explosive charges, etc., can solve problems that are not suitable for effective fluid flow

Inactive Publication Date: 2019-10-18
OWEN OIL TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the location and orientation of such fractures are less suitable for efficient fluid flow due to tortuosity and the creation of leaky zones

Method used

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  • Limited penetration perforating methods for oilfield applications
  • Limited penetration perforating methods for oilfield applications
  • Limited penetration perforating methods for oilfield applications

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Embodiment Construction

[0015] Aspects of the present disclosure provide methods and related perforating tools for completing wells in unconventional formations, such as hydrocarbon-bearing shale formations. For purposes of this disclosure, an "unconventional" formation is typically a formation with a permeability of less than 10 millidarcy (mD). Many "unconventional" formations have permeability between 1 nanoDarcy (nD) and 1 millidarcy (mD). In contrast to traditional perforating techniques, perforating tools according to the present disclosure are designed to drill holes only in the well tubular and surrounding cement sheath. The rock and soil surrounding the wellbore are at best impacted only by the perforating jets produced by the perforating tools. Thus, bowing and microcracks can be significantly reduced, if not eliminated. Thus, by maintaining the formation layer substantially intact, the effectiveness of subsequent hydraulic fracturing operations may be improved.

[0016] refer to Figur...

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Abstract

A method for completing an unconventional subterranean formation include the steps of positioning a perforating tool in a section of the deviated wellbore that intersects the unconventional formation,forming at least one opening in a production structure without substantially penetrating into a surrounding formation by firing the perforating tool, and fracturing the formation by pumping a fracturing fluid through the at least one opening. The perforating tool may include shaped charges that have a charge case, a liner disposed in the charge case, and an explosive material filling an interiorof the charge case.

Description

technical field [0001] The present disclosure relates to equipment and methods for well completions. Background technique [0002] Oil and gas production wells typically include a string of casing within the wellbore that penetrates subterranean oil or gas deposits. The casing string adds to the integrity of the wellbore and provides a path for production fluids to reach the surface. Typically, well completions involve cementing the casing to the face of the wellbore and then perforating the formation by detonating shaped charges. When detonated, the shaped charge produces a jet that passes through the casing and concrete and creates a short-distance tunnel into the adjacent formation. Perforated tunneling is the main cause of tortuosity in unconventional hydraulically fractured reservoirs. Perforation may also create microfractures in the nearby wellbore, which may create a loss zone that is carried away from the desired zone for fracturing where the natural fractures oc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/117F42B1/028
CPCE21B43/117F42B1/028
Inventor C·D·戴M·C·克莱J·金赛C·贝弗里奇S·吉尔特D·W·普拉特J·科克尔
Owner OWEN OIL TOOLS
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