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Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method

A technology for calculating models and mechanical parameters, used in special data processing applications, calculations, CAD numerical modeling, etc., and can solve problems such as inability to calculate mechanical parameters

Active Publication Date: 2017-03-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the inability to calculate the mechanical parameters of hydraulic sandblasting fixed-point perforation in low-permeability oil and gas reservoirs, the purpose of this invention is to propose a calculation model and method for hydraulic sandblasting fixed-point perforation mechanical parameters, which solves the problem of hydraulic sandblasting fixed-point perforation in low-permeability oil and gas reservoirs. The calculation of mechanical parameters of sand fixed-point perforation is difficult, which greatly improves the design efficiency, accuracy and construction success rate of hydraulic sandblasting fixed-point perforation in low-permeability oil and gas reservoirs

Method used

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  • Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method
  • Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method
  • Hydraulic sandblasting fixed-point perforation mechanical parameter calculation model and application method

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Embodiment 1

[0063] The hydraulic sandblasting fixed-point perforation mechanical parameter calculation model provided by the embodiment of the present invention includes the hydraulic sandblasting fixed-point perforation mechanical parameter calculation model; the hydraulic sandblasting fixed-point perforation cement sheath mechanical parameter calculation model; the hydraulic sandblasting fixed-point penetration Calculation model of stratum mechanical parameters; Calculation model of energy parameters of hydraulic sand blasting fixed-point penetration through casing, cement sheath and stratum system.

[0064] The working principle of the present invention is: under the effect of initial displacement, initial flow velocity, initial impact force of hydro-ejector nozzle, consider the shape, contact coefficient and sleeve pipe, cement sheath, Influenced by formation property parameters, according to the principle of energy conservation and momentum theorem, establish the energy equation of hy...

Embodiment 2

[0066] On the basis of Example 1, the hydraulic sandblasting fixed-point shooting casing mechanical parameter calculation model includes,

[0067] (a) The flow velocity v when the jet stream shoots through the casing to the inner wall of the cement sheath wi , m / s;

[0068]

[0069] In formula (1), ψ is the shape coefficient of the jet stream, which is determined according to the jet test; ξ is the contact coefficient between the jet stream and the casing, which is determined by the test; K t is the local extrusion cutting stress concentration factor; δ c is the casing wall thickness, mm; σ cs is the yield strength of casing material, MPa; m i is the jet liquid mass of the i-th nozzle, kg; α is the half-angle of the end shape of the jet stream on the bushing, in degrees; v ci is the jet velocity at the outlet of the i-th nozzle after reaching the casing, m / s;

[0070]

[0071] In formula (2), v oi is the initial flow velocity of the i-th nozzle, m / s, determined by ...

Embodiment 3

[0117] On the basis of Example 1, the hydraulic sandblasting fixed-point shot through the cement sheath mechanical parameters calculation model includes, (a) the flow velocity v when the jet liquid stream shoots through the casing to the inner wall of the cement sheath ri , m / s

[0118]

[0119] In formula (8), v ci is the jet velocity at the outlet of the i-th nozzle after reaching the casing, m / s; m i is the jet mass of the i-th nozzle; kg; ψ is the shape coefficient of the jet stream, determined according to the jet test; ξ is the contact coefficient between the jet stream and the casing, determined by the test; K t is the local extrusion cutting stress concentration factor; δ c is the casing wall thickness, mm; σ cs is the yield strength of the casing material, MPa; α is the half-angle of the shape of the end of the hole drilled by the jet stream on the casing, degrees; ψ′ is the flow shape coefficient of the jet stream in the cement sheath, determined according to t...

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Abstract

The invention relates to the field of hydraulic sandblasting fixed-point perforation, in particular to a hydraulic sandblasting fixed-point perforation mechanical parameter calculation model. The hydraulic sandblasting fixed-point perforation mechanical parameter calculation model includes a hydraulic sandblasting fixed-point perforation casing pipe mechanical parameter calculation model, a hydraulic sandblasting fixed-point perforation cement sheath mechanical parameter calculation model, a hydraulic sandblasting fixed-point perforation formation mechanical parameter calculation model, and hydraulic sandblasting fixed-point perforation casing pipe, cement sheath and formation system energy parameter calculation models. The hydraulic sandblasting fixed-point perforation mechanical parameter calculation model has an important reference value for improving construction design efficiency and accuracy and construction success rate of hydraulic sandblasting fixed-point perforation of low-permeability reservoirs. A theoretical reference is provided for construction designers of the hydraulic sandblasting fixed-point perforation of the low-permeability reservoirs; the field application effect is good; and the mechanical model is high in calculation precision and high in practicality.

Description

technical field [0001] The invention relates to the field of hydraulic sandblasting fixed-point perforation, in particular to a mechanical parameter calculation model and method of hydraulic sandblasting fixed-point perforation. Background technique [0002] The hydraulic sandblasting fixed-point perforating process is to convert the pressure energy into kinetic energy with the help of jet tools under the condition of high-pressure and high-speed sand-carrying liquid injection, and use high-speed fluid impact to form a perforation channel, which is shot through the casing, cement sheath and formation in sequence, thereby completing the process. Hydraulic perforation forms a clean fluid channel in the formation, reduces the skin factor of oil and gas wells, and improves the perfection of oil and gas wells and formation permeability. According to investigations, for the hydraulic sandblasting fixed-point perforation technology, predecessors have carried out some mechanism expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 仝少凯王祖文白明伟杨小平岳艳芳温亚魁张冕徐迎新
Owner BC P INC CHINA NAT PETROLEUM CORP
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