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Autofrettage process for a pump fluid end

A treatment method and prestressing technology, applied in the field of prestressing treatment, can solve the problem of cylinder block being susceptible to fatigue damage and other problems

Inactive Publication Date: 2008-02-20
普拉德研究及发展公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, repeated exposure of the fluid end of the pump to high pressures will render the fluid end cylinder susceptible to fatigue damage

Method used

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  • Autofrettage process for a pump fluid end
  • Autofrettage process for a pump fluid end

Examples

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Embodiment Construction

[0012] As mentioned above, in oil and gas wells, multi-cylinder reciprocating pumps are often used to pump bottomhole high-pressure fracturing fluids to increase well productivity. One embodiment of such a pump 10 is shown in FIG. 1 . In the illustrated embodiment, the pump 10 is a triplex pump having three cylinders 12A-12C, each cylinder having a corresponding piston 14A-14C arranged to move relative thereto. For the purposes of this document, the central cylinder of the three cylinders will be referred to as the central cylinder 12B, while the remaining two cylinders will be referred to as the side cylinders 12A, 12C. However, as discussed further below, the pump 10 may be a pump having any suitable number of cylinders, such as a five cylinder pump (pentaplex pump) or a seven cylinder pump (septax pump).

[0013] As will be described further below, in the embodiment shown in this figure, the pump 10 includes two parts, a power end 16 and a fluid end 18 . The power end 16 ...

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Abstract

A multi-step autofrettage process for pre-treating a multi-cylinder reciprocating pump fluid end that has a central cylinder and at least two side cylinders is provided that includes autofrettaging the central cylinder; and autofrettaging the at least two side cylinders, wherein the autofrettaging of the central cylinder is performed independently of the autofettaging of the at least two side cylinders.

Description

technical field [0001] In general, the present invention relates to an autofrettage process for mechanically preconditioning the fluid ends of multi-cylinder reciprocating pumps in order to introduce residual compressive stresses within the fluid ends of the cylinders. Background technique [0002] Hydraulic fracturing of downhole formations is an urgent task to induce oil flow. Typically, this is done at higher pressures downhole by vacuum pumping oil to fracture the adjacent downhole soil and rock. Oil can then flow downhole through these faults to significantly increase well productivity. Reciprocating pumps, especially triplex pumps, are generally used to pump high-pressure fracturing fluids downhole. However, repeated exposure of the fluid end of the pump to high pressures will render the fluid end cylinder susceptible to fatigue damage. Accordingly, it is required to enhance the fatigue resistance of the fluid-end cylinders of multi-cylinder reciprocating pumps. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/04
Inventor 帕萨·甘格利杰赫·帕本乔·休本施密特内森·圣米歇尔罗德·沙姆派因
Owner 普拉德研究及发展公司
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