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Method for simulating unsteady channeling between bedrock and fracture of compact oil reservoir

A tight oil reservoir, unsteady state technology, applied in earthwork drilling and production, wellbore/well components, etc., can solve problems such as deviation of simulation results

Active Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the differences between the sub-grids divided by the MINC model and the actual pressure field distribution in the tight bedrock, there is still a certain deviation in the simulation results.

Method used

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  • Method for simulating unsteady channeling between bedrock and fracture of compact oil reservoir
  • Method for simulating unsteady channeling between bedrock and fracture of compact oil reservoir
  • Method for simulating unsteady channeling between bedrock and fracture of compact oil reservoir

Examples

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Effect test

Embodiment 1

[0085] Such as Figure 9 As shown, in this example, a fractured reservoir unit conforming to the regular distribution of two-dimensional fractures is selected, the model size is 10m (meter)×10m, the initial pressure is 40MPa (MPa), and the fracture pressure is 20MPa. The MINC model (regular nested grid model) and the MSR model (isobaric nested grid model) are used to simulate the flow, and the cumulative oil production is calculated, and the fine grid solution is used as a reference solution.

[0086] The MINC6 and MSR6 models were used to solve the solution respectively, and compared with the reference solution, the comparison results of early and mid-term cumulative oil production (such as Figure 10 , Figure 11shown). It can be obtained that the early MINC6 model is basically consistent with the reference solution, while the results of the MSR6 model have certain deviations; the results of the mid-term MSR6 model are basically consistent with the reference solution, but ...

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Abstract

The invention discloses a method for simulating unsteady channeling between a bedrock and a fracture of a compact oil reservoir. The method is characterized by comprising the following steps of: (1) selecting a target compact oil reservoir and determining a fractured oil reservoir unit; (2) dividing the fractured reservoir unit to obtain a regular nested grid and an isobaric nested grid of the fractured reservoir unit; (3) determining a conductivity coefficient between nested grids in the fractured reservoir unit; and (4) obtaining the unsteady channeling rate between the bedrock and the fracture of the target compact oil reservoir. According to the method, the whole process of unsteady channeling between the compact bedrock and the fracture can be accurately described, the unsteady channeling rate between the bedrock and the fracture of the target compact oil reservoir is obtained, and the method is simple, efficient and high in precision.

Description

technical field [0001] The invention relates to a method for simulating unsteady channeling between tight oil reservoir bedrock and fractures, belonging to the field of oil and gas field development. Background technique [0002] Tight oil refers to oil that exists in source rocks in an adsorbed or free state, or exists in reservoir rocks such as interbedded with source rocks, close to tight sandstone, tight carbonate rocks, etc., and has not undergone large-scale long-distance migration. Oil gathers. Although the typical characteristics of tight oil reservoirs are poor reservoir physical properties, the source and reservoir are integrated or closely adjacent, the oil-bearing conditions are good, the reserves are large, and the oil and gas are continuously distributed, which is a continuous sedimentary deposit. The key to the formation of tight oil is the continuous distribution of tight reservoirs and good oil-generating layers with high maturity. With the improvement of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00Y02A10/40
Inventor 蒲军秦学杰苟斐斐方文超魏漪
Owner CHINA PETROLEUM & CHEM CORP
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