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Numerical simulation method for heterogeneous oil combination flooding system

A composite flooding and numerical simulation technology, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as numerical simulation methods of discontinuous migration regulation and displacement mechanism that have not yet been found.

Active Publication Date: 2014-04-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

No numerical simulation method has been found to describe the discontinuous migration and displacement mechanism of pre-crosslinked gel particles

Method used

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  • Numerical simulation method for heterogeneous oil combination flooding system
  • Numerical simulation method for heterogeneous oil combination flooding system
  • Numerical simulation method for heterogeneous oil combination flooding system

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Embodiment Construction

[0020] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0021] Such as figure 2 as shown, figure 2 It is a schematic diagram of the migration and plugging mechanism of pre-crosslinked gel particles through pore throats. Among them, △P represents the pressure gradient of the seepage field, and Pmax represents the pressure gradient of particle deformation and migration, which can be measured by indoor seepage experiments. When △P≤Pmax, the pressure gradient of the seepage field is not enough to cause the particles to migrate. At this time, the particles stay in the pores in the form of blockage, deposition, adsorption, etc., and the displacement liquid turns to flow into other pores; when △ When P>Pmax, the pressure gradient of the seepage field reaches the critical value of particle migration, and ...

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Abstract

The invention provides a numerical simulation method for a heterogeneous oil combination flooding system. The method comprises the steps of solving a water phase pressure equation and an oil phase pressure equation; solving a phase saturability equation and a mass conservation equation of all components, and calculating the pre-crosslinked gel particle concentration under the current time step; calculating the pre-crosslinked gel particle residual resistance factor under the current time step in an interpolation mode according to a pre-crosslinked gel particle residual resistance factor curve; calculating the viscosity of pre-crosslinked gel particle suspension liquid; correcting the fluidity coefficient of the Darcy law, calculating water phase flowing speed according to the Darcy law, and carrying out phase pressure equation calculation of the next time step until the heterogeneous combination flooding simulation time is over. By means of the numerical simulation method for the heterogeneous oil combination flooding system, a mathematic model describing heterogeneous combination flooding blocking profile control and migration profile controlling and flooding, and the numerical simulation method effectively representing the pre-crosslinked gel particle displacement mechanism is provided.

Description

technical field [0001] The invention relates to the field of reservoir numerical simulation theory research, technical application and oil and gas field development to enhance oil recovery, in particular to a numerical simulation method for a heterogeneous composite flooding system. Background technique [0002] With the deepening of research on chemical flooding technology, the new flooding system represented by heterogeneous (pre-crosslinked gel particles + polymer + surfactant) composite flooding has developed rapidly, and has been used in mechanism research, field tests significant progress has been made. Heterogeneous composite flooding is a new control and flooding system developed in oilfields in recent years. Its main displacement agent is branched semi-crosslinked viscoelastic pre-crosslinked gel particles (B-PPG). When flowing in porous media, solid particles are suspended in the solution. With the flow of displacement fluid, the pore throat will be blocked due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李振泉曹绪龙宋新旺戴涛于金彪曹伟东段敏史敬华陈苏谭保国汪勇陈燕虎孙红霞孟薇宋勇胡慧芳
Owner CHINA PETROLEUM & CHEM CORP
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