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Hydraulic fracturing method for reducing cracking pressure through fixed-point perforation

A technology of hydraulic fracturing and formation fracture pressure, which is applied in the field of oil and gas field exploration and development, can solve the problems of inconspicuous effect, cumbersome construction procedures, and high operating costs, and achieve the effects of easy on-site promotion, increased construction procedures, and simple operation

Inactive Publication Date: 2020-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the existing problems of insignificant effect of reducing the breaking pressure, cumbersome construction procedures and high operating costs, the present invention provides a hydraulic fracturing method for reducing the breaking pressure by fixed-point perforation. Fixed-point perforation, each group of perforating charges is concentrated at one point, each group of perforating charges forms a stress fracture zone in the formation, and cooperates with low-viscosity liquid to break the pressure, thereby greatly reducing the fracture pressure of the formation

Method used

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  • Hydraulic fracturing method for reducing cracking pressure through fixed-point perforation

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Embodiment 1

[0021] In order to overcome the existing problems of insignificant effect of reducing broken pressure, cumbersome construction procedures and high operating costs, the present invention provides such figure 1 A hydraulic fracturing method for fixed-point perforation to reduce the breaking pressure is shown. The present invention uses perforating guns to carry out multiple groups of fixed-point perforations. Each group of perforating charges is concentrated at one point, and each group of perforating charges is A stress fracture zone is formed, which cooperates with the low-viscosity liquid to break the pressure, thereby greatly reducing the fracture pressure of the formation. The method is simple to operate, does not increase the construction process and operation cost, can effectively reduce formation fracture pressure, is convenient for on-site promotion, and is suitable for hydraulic fracturing operations of high-hardness and high-fracture-pressure reservoirs.

[0022] A hy...

Embodiment 2

[0026] Based on Embodiment 1, in this embodiment, the multiple groups of fixed-point perforations are fire perforations, and the number of perforations in each group is 3-4.

[0027] For the multiple groups of fixed-point perforations, each group of perforations has a perforation thickness of 0.25-0.33m.

[0028] The hydraulic fracturing of the reservoir is to use low-viscosity fracturing fluid to break the pressure, and then perform subsequent fracturing procedures. The subsequent fracturing procedure is an existing conventional fracturing procedure. No further description will be made in the present invention.

[0029] The low-viscosity fracturing fluid is active water or slick water, the viscosity of which is lower than 2mPa.s.

[0030] In the present invention, the perforating gun performs multiple sets of fixed-point perforation, and each set of perforating bullets is concentrated at one point. Each set of perforating bullets forms a stress fracture zone in the formatio...

Embodiment 3

[0036] On the basis of Example 2, in this example, cable transmission is used to carry out fixed-point perforation on the stratum. There are 3; hydraulic fracturing is carried out afterwards, and hydraulic fracturing uses low-viscosity fracturing fluid to break pressure. In this embodiment, the low-viscosity fracturing fluid uses active water, and active water is used as a pre-fluid to break pressure on the formation. The active water viscosity range is 1.3mPa.s, and the component distribution ratio is: 0.5 part of clay stabilizer, 0.5 part of drainage aid, and the rest is water. Hydraulic fracturing uses low-viscosity fracturing fluid to break pressure, and other fracturing procedures are the same as conventional fracturing processes. Hydraulic fracturing will not be described in detail in this disclosure. After the low-viscosity fracturing fluid breaks the pressure, the fracture pressure of hydraulic fracturing is effectively reduced.

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Abstract

The invention provides a hydraulic fracturing method for reducing cracking pressure through fixed-point perforation. The method comprises the following specific steps that a perforating gun performs multiple-group fixed-point perforation, each group of perforating bullets are concentrated at one point, each group of perforating bullets form a stress crushing area in a stratum, so that the crackingpressure of the stratum is reduced, and then hydraulic fracturing is performed on a reservoir stratum. The method is easy to operate, construction procedures are not increased, the operation cost isnot increased, the stratum cracking pressure can be effectively reduced, and the method is suitable for hydraulic fracturing operation of a high-hardness and high-cracking-pressure reservoir stratum.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, specifically relates to hydraulic fracturing technology, and is a hydraulic fracturing method for reducing broken pressure by fixed-point perforation. Background technique [0002] In recent years, with the continuous development of exploration and development technology, more and more attention has been paid to the development of low permeability reservoirs and unconventional oil and gas resources. Hydraulic fracturing is also gaining more and more attention as a necessary means for stimulation of low permeability reservoirs and unconventional reservoirs. Hydraulic fracturing refers to the method of perforating, pumping liquid and proppant into the formation, creating a channel with conductivity, enhancing the communication between the wellbore and (production layer) reservoir, and increasing the production of a single well. [0003] However, due to the tight p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/116C09K8/68
CPCE21B43/26E21B43/116C09K8/68
Inventor 李川张矿生张翔唐梅荣薛小佳李昌恒王泫懿向奎余兴国鲜晟
Owner PETROCHINA CO LTD
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