TAMU PETE 662 - Ch 5 (40 pages)

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Ch 5



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Ch 5

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Pages:
40
School:
Texas A&M University
Course:
Pete 662 - Production Engineering
Production Engineering Documents

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PETE 662 Production Engineering Chapter 5 Production from Horizontal Wells Vertical Well Flow Pattern re pwf pe Top View Cross Sectional View Radial drainage pattern Horizontal Well Flow Patterns Heel Toe Combination of radial linear and elliptical drainage patterns Horizontal Wells Advantages Over Vertical Wells Larger and more efficient drainage pattern leading to increased overall hydrocarbon recovery efficiency Increased production rate due to greater wellbore length exposed to the pay zone Reduced water and gas coning resulting from reduced drawdown in the reservoir for a given production rate Reduced pressure drop around the wellbore Lower fluid velocities around the wellbore A general reduction in sand production from reduced pressure drop around the wellbore and the resulting low fluid velocities around the wellbore Horizontal Wells Important Factors Affecting Well Productivity Vertical permeability low vertical permeability or discontinuities detrimental to productivity Permeability anisotropy in horizontal plane higher well productivity from horizontal wells drilled normal to the large horizontal permeability direction Direction of maximum horizontal stress direction of maximum horizontal permeability the same as that of maximum horizontal stress Horizontal Wells Steady State Inflow Performance Joshi Model z y z plane x y qv x y plane qh Horizontal Wells Steady State Inflow Performance Joshi Model Integrating flow long the x y plane over the thickness h yields qh 2 k p a a L 2 Bo ln L 2 2 2 5 1 Assumptions made in deriving Eq 5 1 elliptical drainage area with length of major axis 2a constant pressure at the drainage boundary Horizontal Wells Steady State Inflow Performance Joshi Model Integrating flow long the y z plane over the well length L yields qv 2 k p 5 2 h Bo ln 2rw Assumptions made in deriving Eq 5 2 Radial flow from the vertical boundary located 2 h from the well Pressure at the boundary pressure at the elliptical horizontal boundary Horizontal



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