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Redsearch on Variable Mass Flowing Law and Direction Optimization of the Borizantal Wells

Author: ZhangXu
Tutor: SunKeMing
School: Liaoning Technical University
Course: Engineering Mechanics
Keywords: horizontal well variable mass flowing fluid-solid coupling permeability horizontal well direction optimization
CLC: TE355.6
Type: Master's thesis
Year: 2012
Downloads: 89
Quote: 0
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Abstract


As the reservoir near the well’s fluid seepage effects, continuous fluid flow into the wellbore from shaft lining along the horizontal well during the process of drilling oil and gas inhorizontal well production,which make the flowing in horizontal well shaft lining a kind ofvariable mass flowing whose mass flow increases gradually.The process of reservoir fluidseepage,reservoir deformation,and the interaction and intercoupling of pipe flow exist in theprocess of drilling oil and gas in horizontal well production.The research on the variable massflowing law of horizontal wells under the action of fluid-solid coupling reveals laws of thereservoir near the well’s fluid seepage,reservoir deformation,and the intercoupling of the flowingin the well bore.Establish the model of the reservoir deformation near the well and the variablemass flowing of the fluid in the well bore and make an analytical analysis of the radial flow ofthe horizontal well and the interaction of pressure drop and the variable mass flowing.Establishthe unsteady model of the well bore and oil reservoir considering the unsteady oil reservoircondition of different perforating completion methods and gives solution of themodel.Horizontal well productivity is related to the reservoir closely. In direction optimizationaspect of the horizontal wells,the paper put forward the idea that optimize the azimuth angle ofthe horizontal well according to the differences of the rock permeability direction and themethod to determine rock directional permeability so that the computation model of directionalpermeability has been established. The analysis of anisotropic reservoir seepage flow field andproductivity of horizontal well shows that isobar is mainly controlled by the anisotropy ofpermeability and similar to concentric ellipse in the area far away from horizontal well;That ismainly controlled by well bore shape and the anisotropy of permeability and presents irregularshape in the middle area; That is mainly controlled by well bore shape and presents confocalellipse near the horizontal well area.The oil reserves controlled reserve will be reduced under thesame production differential pressure if the horizontal well parallels with the maximumpermeability direction.The controlled reserve of horizontal well increases as the anisotropicdegree increases if the horizontal well is perpendicular to the maximum permeabilitydirection.under the same anisotropic degree the larger between the direction of the horizontalwell and maximum permeability direction the larger the horizontal well controlled reserve willbe.

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Production Engineering > Oil recovery technology > Horizontal oil wells
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