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The Jet Characteristics Theory Analysis and Numerical Simulation of Oil Well High Pressure Water Rock Breaking Nozzles

Author: ShaoMingHua
Tutor: XuHongGuang
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: High-pressure jet Rock breaking Bottomhole flow field Numerical Simulation Nozzle
CLC: TE21
Type: Master's thesis
Year: 2009
Downloads: 134
Quote: 1
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Abstract


Radial horizontal well drilling high pressure water jet technology is the use of high-pressure water jet rock breaking , in a well in the same reservoir or different reservoirs along the radial horizontal wells drilled more than one eye , to increase oil and gas channels , improve the flow direction to improve the degree of utilization of oil and gas reservoirs purpose . The technology can be developed as a special economic reservoirs provide the means for the oil and gas fields in the late EOR , stable production , energy saving is important. In this thesis, using theoretical analysis and numerical simulation , comprehensive and systematic study of the oil -pressure water jets jets given nozzle structure more reasonable . For horizontal drilling techniques , analysis of high-pressure water jet rock breaking mechanism of the effect of water jet rock breaking depends on the rock surface stagnation pressure . Submerged jet initial fragmentation occurs when the rock on the rock surface required minimum peak stagnation pressure water jet is submerged rock breaking threshold pressure . Fluid dynamics analysis using the existing methods , from the theoretical analysis submerged circular layers of single nozzle flow , the structural characteristics of turbulent jet and further deduction multi-nozzle jet flow velocity and pressure fields . By using ADINA software , the use of high Reynolds number k? Ε two equation model and SIMPLE algorithm submerged under single nozzle and multi-nozzle non- free jet bottomhole flow field numerical simulation and solution . Simulation showed that: bottomhole pressure jet flow field by the free jet region , the jet impact zone , overflow area, regurgitation area, whirlpool area composition ; single nozzle jet without isokinetic core, asymmetric flow field structure , the cross section velocity distribution does not have a self- persistence ; two high-pressure jet nozzle flow structure symmetry and no negative pressure zone ; without a backward multi-nozzle jet nozzle flow structure symmetry , the maximum speed value, high bottomhole pressure value node , with good rock breaking effect ; backward jet nozzle will reduce the maximum speed value and the bottomhole pressure nodes , asymmetrical flow field structure , rock breaking ineffective . Paper given at the end of the nozzle inlet pressure is calculated.

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CLC: > Industrial Technology > Oil and gas industry > Drilling engineering > Drilling theory
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