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Hydrofracture design parameter optimization method based on fine classification of reservoir

A technology with design parameters and fine classification, which is applied to earth-moving drilling, production of fluids, wellbore/well components, etc. It can solve the problems of not taking into account the change of physical properties with location, lack of pertinence of fracturing parameters, etc., and achieve optimized results. reliable results

Active Publication Date: 2015-10-28
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology

The traditional hydraulic fracturing design usually adopts the average value of various physical parameters of the reservoir, and optimizes the fracturing parameters by treating the entire reservoir as a homogeneous geological model, without considering the change of its physical properties with the location, so the fracturing Parameter optimization lacks pertinence

Method used

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Embodiment Construction

[0024] A method for optimizing hydraulic fracturing design parameters based on fine reservoir classification, comprising the following steps in sequence:

[0025] (A) calculate formation factor Kh corresponding to all oil wells on the current reservoir;

[0026] (B) The minimum value of the formation coefficient corresponding to each oil well is a, and the maximum value is b. The reservoirs are divided into four subcategories:

[0027] Class I reservoir: Kh≥a+0.5(b-a);

[0028] Type II reservoir: a+0.25(b-a)≤Kh

[0029] Class III reservoir: a+0.125(b-a)≤Kh<a+0.25(b-a);

[0030] Class IV reservoir: Kh

[0031] (C) For each small type of reservoir, the average value of reservoir thickness and permeability is taken, and the fracture length ratio of fracturing fractures is 0.18-0.43, and the conductivity of fracturing fractures is 10D·cm, 20D·cm, Under the conditions of 30D·cm, 40D·cm and 50D·cm, the reservoir numerical simulation software Eclipse was...

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Abstract

The invention discloses a hydrofracture design parameter optimization method based on fine classification of a reservoir. The hydrofracture design parameter optimization method based on fine classification of the reservoir comprises the following steps of (A) calculating current stratum coefficients Kh corresponding to all oil wells on the reservoir; (B) dividing the reservoir into four small categories; (C) calculating a net present value after hydrofracture for 3 years under the conditions that the fracture length ratio of a hydrofracture crack is 0.18-0.43 and the flow guiding capability of the hydrofracture crack is 10D.cm, 20D.cm, 30D.cm, 40D.cm and 50D.cm, and drawing a curve graph by using the fracture length ratio of the crack as an abscissa and the net present value after hydrofracture for 3 years as an ordinate; (D) using the crack fracture length ratio and the crack flow guiding capability which correspond to an inflection point with the maximum net present value as the optimal hydrofracture design parameters of the small categories of the reservoir; and (E) designing hydrofracture schemes on the different small categories of the reservoir by using the different optimal hydrofracture parameters. The principle of the hydrofracture design parameter optimization method is reliable; and the hydrofracture design parameter optimization method is easy and convenient to implement and can provide a refined guidance for parameter optimization in the hydrofracture scheme design.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a parameter optimization method for hydraulic fracturing design in oil reservoir stimulation and transformation. Background technique [0002] Hydraulic fracturing is the main measure for reservoir stimulation and reconstruction. It is mainly to inject high-pressure liquid (pre-fluid) into the reservoir under the condition of higher than the fracture pressure of the oil-bearing reservoir or the closure pressure of the natural fracture to form a new fracture in the reservoir. Artificial fractures or natural fractures are opened, and then liquid (sand-carrying fluid) carrying proppant (sand grains) is injected into the fractures. After the flowback of the sand-carrying fluid, the proppant left in the fracture prevents the fracture from completely closing, and keeps the fracture open to a certain degree under the closing pressure, thereby forming a flow space for the fluid and having a certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
Inventor 卢聪郭建春白翔何颂根周玉龙蒋宝云
Owner SOUTHWEST PETROLEUM UNIV
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