Calculation method of productivity of water-producing gas wells in inclined water-bearing gas reservoirs

A calculation method and technology of well productivity, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of not considering the impact of productivity, etc.

Active Publication Date: 2018-08-31
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] However, most of the gas reservoirs are anticline gas reservoirs with a certain dip angle. The productivity equations of relevant water-producing gas wells established in previous studies have not considered the influence of the reservoir angle of inclined water-bearing gas reservoirs on productivity.

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  • Calculation method of productivity of water-producing gas wells in inclined water-bearing gas reservoirs
  • Calculation method of productivity of water-producing gas wells in inclined water-bearing gas reservoirs
  • Calculation method of productivity of water-producing gas wells in inclined water-bearing gas reservoirs

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Embodiment Construction

[0045] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] Such as figure 1 As shown, the inclined water-bearing gas reservoir has the following characteristics: a certain reservoir dip angle θ; gas and water are immiscible; all reservoirs participate in production, and the gas and water in the formation flow radially into the well; the gas and water in the formation Slightly compressible, and the compressibility coefficient is constant; the fluid viscosity is constant, and the gas-water two-phase high-speed non-Darcy seepage flow is considered without considering the starting pressure gradient; the influence of capillary force is ignored; the fluid is isothermal flow.

[0047] In the following formula, θ is the dip angle of the reservoir, 0°≤θ≤90°; K is the permeability of the gas reservoir, the unit is 10 -3 μm 2 ;K rw 、K rg are the relative permeability of water phase and gas phase respecti...

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Abstract

The invention discloses a method for calculating productivity of a water-producing gas well of a tilted water-bearing gas reservoir. According to the method, from a seepage theory, the influence of a tilt angle of a reservoir in the water-bearing gas reservoir on the productivity of the gas well is fully considered, and a productivity calculation equation of the water-producing gas well is established, so that a reasonable theoretic basis is provided for predicting the productivity of the tilted water-bearing gas reservoir and making a reasonable working system. The method has the superiorities that the reservoir tilt angle of the gas reservoir is fully considered; the situation that the gas reservoir has edge-bottom water is considered and a relation of influence of producing water of the gas well on the productivity of the gas well is established; gas-water two-phase high-velocity non-Darcy flow is considered; and a relation curve of a water production rate and a water saturation degree is drawn by applying a relative permeability curve and considering influence of removal of condensed water.

Description

technical field [0001] The invention relates to a method for calculating the productivity of a water-producing gas well, in particular to a method for calculating the productivity of a water-producing gas well in an inclined water-gas reservoir. Background technique [0002] With the increase of the recovery degree of the gas reservoir, the movable water in the formation will continue to accumulate at the bottom of the well, resulting in an increase in the production water-gas ratio of the gas well, seriously affecting the production and productivity of the gas well, and affecting the reserve evaluation and development plan of the entire gas field implement. Therefore, it is particularly important to determine the productivity of water-producing gas wells and the degree of liquid phase damage to formulate reasonable gas well production measures. [0003] Predecessors have done a lot of research on the influence of gas well water production on productivity, mainly in the fol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 黄小亮戚志林严文德雷登生袁迎中李继强向祖平肖前华
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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