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Well fracture modelling

A fracture and wellbore technology, applied in geographic modeling, wellbore/well components, measurement, etc., can solve problems that cannot be practically used in oil fields

Active Publication Date: 2020-05-01
ROXAR SOFTWARE SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Both the gridding method and the well pattern method mentioned in the background art are too slow to be practical for fields with many wells

Method used

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Embodiment Construction

[0021] According to the invention, the fluid flow in the reservoir is solved iteratively. In general, details of the numerical method can be found in D. Peaceman's book Fundamentals of Numerical Reservoir Simulation [4] and the innovation presented here lies in the calculation of fracture flow and its coupling with formation and well flow. To evolve the entire system of equations from time t to time t+Δt, iterations are performed on the following instructions until a solution within the selected total error tolerance is found or the maximum number of iterations has been reached. In case the maximum number of iterations has been reached, the time step size Δt is considered unsolvable and the process is repeated with a new time step size Δt′<Δt. The iteration instructions are:

[0022] 1. Calculate the net composition and associated fluid volume change for each reservoir unit. Both inflows and outflows are from and to other reservoir units or well connections, and their calcul...

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Abstract

The present disclosure relates to numerical simulation of hydrocarbon reservoirs, in particular to a method for modelling the fluid flowing in fractures close to a well bore. The present invention describes a fast solver for multi-component multi-phase flow and its embodiment on a programmable electronic automaton.

Description

Background technique [0001] Inducing fractures around wells to enhance fluid flow is a common technique used in the operation of oil and gas reservoirs. It predates so-called "fracking" by decades, which refers to the recovery of hydrocarbons from unconventional oil reservoirs such as shale. Typically, a mixture of fracture fluid and proppant is injected into the well under high pressure. This creates a set of vertical fractures that (usually) propagate from the wellbore into the surrounding rock, which—due to the action of the proppant—remain open even after injection has ceased. Thus, the well's reach is effectively expanded to allow increased hydrocarbon production without the need to drill new wells. [0002] Multiphase and multicomponent reservoir simulators are all based on numerically solving a set of partial differential equations derived from Darcy's law. At each time step, an iterative method, usually Newton's method, is employed to minimize the multidimensional r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/00G01V99/00
CPCE21B41/00G01V2210/646G06F30/28G01V20/00E21B2200/20E21B43/26E21B47/06E21B47/10E21B49/08
Inventor 丹尼尔·克里斯托夫·林斯米凯莱·塔罗尼
Owner ROXAR SOFTWARE SOLUTIONS
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