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ControL method and device of supercriticaL carbon dioxide injection fracturing phase state and eLectronic equipment

A carbon dioxide and control method technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of insufficient consideration of influence and low calculation accuracy

Active Publication Date: 2018-11-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few reports on the calculation method of supercritical carbon dioxide injection fracturing wellbore temperature and pressure, and the influence of various aspects is not fully considered, and the calculation accuracy is low

Method used

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  • ControL method and device of supercriticaL carbon dioxide injection fracturing phase state and eLectronic equipment
  • ControL method and device of supercriticaL carbon dioxide injection fracturing phase state and eLectronic equipment
  • ControL method and device of supercriticaL carbon dioxide injection fracturing phase state and eLectronic equipment

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Experimental program
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Embodiment 1

[0035] figure 1 A supercritical carbon dioxide injection fracturing phase state control method provided by an embodiment of the present invention is shown, including:

[0036] Step S101, obtaining formation parameters, well completion parameters and construction parameters.

[0037] In a possible embodiment, formation parameters include geothermal gradient, rock thermal conductivity, rock specific heat capacity; well completion parameters include well depth, casing size, coiled tubing size, cement sheath size, wellbore size, casing thermal conductivity, casing specific heat capacity , thermal conductivity of coiled tubing, specific heat capacity of coiled tubing, thermal conductivity of cement sheath, specific heat capacity of cement sheath; construction parameters include nozzle diameter, injection speed, injection temperature, and injection time.

[0038] Step S102, establishing a calculation model of physical property parameters of carbon dioxide.

[0039] Step S103, esta...

Embodiment 2

[0045] figure 2It shows another supercritical carbon dioxide injection fracturing phase state control method provided by the embodiment of the present invention, including:

[0046] Step S201, obtaining formation parameters, well completion parameters and construction parameters.

[0047] In a possible embodiment, formation parameters include geothermal gradient, rock thermal conductivity, rock specific heat capacity; well completion parameters include well depth, casing size, coiled tubing size, cement sheath size, wellbore size, casing thermal conductivity, casing specific heat capacity , thermal conductivity of coiled tubing, specific heat capacity of coiled tubing, thermal conductivity of cement sheath, specific heat capacity of cement sheath; construction parameters include nozzle diameter, injection speed, injection temperature, and injection time.

[0048] Step S202, establishing a calculation model of physical property parameters of carbon dioxide.

[0049] In a pos...

Embodiment 3

[0160] For the supercritical carbon dioxide injection fracturing phase state control method in the first embodiment above, see Image 6 , the supercritical carbon dioxide injection fracturing phase state control device includes:

[0161] A parameter acquisition module 11, configured to acquire formation parameters, well completion parameters and construction parameters;

[0162] In a possible embodiment, formation parameters include geothermal gradient, rock thermal conductivity, rock specific heat capacity; well completion parameters include well depth, casing size, coiled tubing size, cement sheath size, wellbore size, casing thermal conductivity, casing specific heat capacity , thermal conductivity of coiled tubing, specific heat capacity of coiled tubing, thermal conductivity of cement sheath, specific heat capacity of cement sheath; construction parameters include nozzle diameter, injection speed, injection temperature, and injection time.

[0163] The physical property ...

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Abstract

The invention provides a controL method and device of a supercriticaL carbon dioxide injection fracturing phase state and eLectronic equipment. The method comprises obtaining formation parameters, compLetion parameters and construction parameters; estabLishing a physicaL parameter caLcuLation modeL of carbon dioxide; estabLishing a weLLbore pressure caLcuLation modeL of carbon dioxide; estabLishing a weLLbore temperature caLcuLation modeL of carbon dioxide; caLcuLating the temperature and pressure of carbon dioxide at the injection point under different construction parameters based on the above-mentioned formation parameters, compLetion parameters and construction parameters and in combination with the physicaL parameters caLcuLation modeL, the weLLbore pressure caLcuLation modeL and theweLLbore temperature caLcuLation modeL to optimize construction parameters. The method estabLishes a corresponding pressure and temperature caLcuLation modeL by comprehensiveLy appLying heat transfertheory and fLuid mechanics and considering the heat exchange between the carbon dioxide emitted from nozzLes and the annuLus carbon dioxide mixed at the injection point to improve the accuracy of caLcuLation and to optimize the construction parameters more accurateLy.

Description

technical field [0001] The invention relates to the field of oil and gas field stimulation technology, in particular to a supercritical carbon dioxide injection fracturing phase state control method, device and electronic equipment. Background technique [0002] At present, large-scale hydraulic fracturing is the key technology for the exploitation of unconventional oil and gas resources such as shale gas and tight sandstone gas. However, our shale gas is mainly distributed in hills and mountainous areas where water resources are scarce and transportation is relatively inconvenient. , Multi-well large-scale fracturing. Therefore, it is urgent to obtain a breakthrough in water-free or water-less fracturing methods. As a kind of waterless fracturing, supercritical carbon dioxide jet fracturing has attracted extensive attention because of its many unique advantages. The key to supercritical carbon dioxide injection fracturing is to accurately predict the temperature and press...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/16
CPCE21B43/164E21B43/26
Inventor 贾敏易良平杨兆中李小刚
Owner SOUTHWEST PETROLEUM UNIV
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