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Method for determining optimal fracture length of vertical well fracturing

A determination method and optimal technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as poor development effect of injection-production area, poor water flooding development effect, and inability to achieve effective and balanced displacement in plane

Pending Publication Date: 2019-07-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology

Under the condition of a certain water injection capacity of the water injection well, the injected water volume in the injection-production area with good physical properties is reduced, and the water flooding development effect is poor; conversely, the development effect of the injection-production area with poor physical properties is poor; this cannot achieve effective and balanced displacement in the plane

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  • Method for determining optimal fracture length of vertical well fracturing
  • Method for determining optimal fracture length of vertical well fracturing
  • Method for determining optimal fracture length of vertical well fracturing

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Embodiment Construction

[0020] In order to further illustrate the present invention, a detailed description is given below.

[0021] Now take the five-point well pattern as an example, such as image 3 shown. image 3 Among them, P1, P2, P3, and P4 are production wells, and I is a water injection well; the physical properties of the reservoir in injection-production area IV are poor, and the physical properties of injection-production areas I, II, and III are the same and better. The permeability of injection-production area IV is 3×10 -3 μm 2 , the starting pressure gradient is 0.0367MPa / m; the permeability of injection-production area I, II and III is 9×10 -3 μm 2 , the starting pressure gradient is 0.0356MPa / m. The physical and fluid properties of other reservoirs in each injection-production area are the same: the porosity is 0.15; the viscosities of oil and water under formation conditions are 2 and 0.4 mPa·s respectively; The radius of the water well is 0.1m; the injection-production pres...

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Abstract

The invention relates to the technical field of vertical well fracturing development of water drive reservoirs, and especially relates to a method for determining the optimal fracture length of a fracturing well for realizing plane balanced displacement of a plane heterogeneous reservoir. The method comprises the following steps: (1) making a relation curve of water content and water saturation according to given relative permeability curves, fluid viscosity and other parameters, and solving a water content derivative fw'(swf) at an oil-water front edge position by using a graphical method; (2) calculating the water breakthrough time of the unfractured well according to the front edge position water content derivative calculated in the step (1) and a calculation formula of the water breakthrough time of the unfractured vertical well; and (3) based on the equivalent well diameter, the fractured well is regarded as a vertical well with the equivalent well diameter, and the equivalent well diameter meeting the condition that the water breakthrough time is equal to the water breakthrough time of the non-fractured well is obtained by utilizing the equivalent well water breakthrough timeand the water breakthrough time of the non-fractured well; and (4) solving the optimal crack length of the fractured well by using a trial algorithm.

Description

technical field [0001] The invention relates to the technical field of vertical well fracturing development of water drive reservoirs, in particular to a method for determining the optimal fracture length of vertical well fracturing that can realize plane effective and balanced displacement in plane heterogeneous oil reservoirs. Background technique [0002] The oilfields in eastern my country are dominated by continental deposits, and the plane distribution of sand bodies in continental sedimentary reservoirs is uneven and the physical properties vary greatly. Production wells in injection-production areas have faster water breakthrough than production wells in injection-production areas with poorer physical properties; in the end, the recovery degree of injection-production areas with poorer physical properties is low, and the development effect is poor. Fracturing technology can change the seepage state of the fluid in the reservoir, reduce the seepage resistance, and impr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 崔传智吴忠维杨勇孙业恒吕广忠任永鹏张传宝李超王振
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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