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Fracturing acidification well and layer selection method based on grey correlation method and analytic hierarchy process

A technology of gray correlation method and analytic hierarchy process, which is applied in the field of fracturing and acidification, can solve the problems of well selection and layer selection, and achieve the effect of simple and practical calculation

Active Publication Date: 2021-05-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Although the current acidification process has been researched and accumulated, the acidification design often adopts the empirical analogy method, but there are still shortcomings in the selection of wells and layers that need to be resolved urgently

Method used

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  • Fracturing acidification well and layer selection method based on grey correlation method and analytic hierarchy process
  • Fracturing acidification well and layer selection method based on grey correlation method and analytic hierarchy process
  • Fracturing acidification well and layer selection method based on grey correlation method and analytic hierarchy process

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Experimental program
Comparison scheme
Effect test

Embodiment

[0073] Five wells in XXXX Oilfield were selected as sample wells, and the AHP analysis of fracturing and acidizing well selection was carried out. The characteristic data of each well are shown in Table 2 below:

[0074] Table 2 Characteristic data of five wells in XXXX oilfield

[0075]

[0076]

[0077] 1) Determine the weight of the characteristic index of the well to the target layer;

[0078] Taking production as the parent sequence, and other characteristic indexes as subsequences, the range transformation is used for data processing, and the calculated correlation coefficients of each well characteristic index are shown in Table 3 below:

[0079] Table 3 Correlation coefficient of well characteristic indexes

[0080]

[0081] The correlation degree of each well characteristic index is shown in Table 4 below:

[0082] Table 4 Correlation degree of well characteristic indexes

[0083]

[0084]

[0085] According to formula (7), the weight relationship c...

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Abstract

The invention relates to a fracturing acidification well and layer selection method based on a grey correlation method and an analytic hierarchy process, and belongs to the technical field of fracturing acidification. In order to overcome the defects in the prior art, the fracturing acidification well and layer selection method based on the grey correlation method and the analytic hierarchy process comprises the steps that the weight of a criterion layer to a target layer is determined according to the grey correlation method; a paired comparison matrix and a weight vector of the criterion layer to the target layer are determined according to the weight of the criterion layer to the target layer; the weight of a scheme layer to the criterion layer is calculated; a paired comparison matrix and a weight vector of the scheme layer to the criterion layer are determined according to the weight of the scheme layer to the criterion layer; a combined weight vector of the scheme layer to the target layer is calculated; and an optimal fracturing acidification well is determined according to the combined weight vector. The defect that the weight of well feature data must be known in a traditional well and layer selection method is overcome, calculation is simple and practical, and certain field practical value is achieved.

Description

technical field [0001] The invention relates to a well and layer selection method for fracturing and acidizing based on a gray correlation method and an analytic hierarchy process, and belongs to the technical field of fracturing and acidizing. Background technique [0002] At present, fracturing and acidizing is an important measure for oil and gas well stimulation in the petroleum industry. In the process of fracturing and acidizing, a certain acidic liquid is continuously injected into the wellbore by a fracturing vehicle. When the pressure in the wellbore is higher than the fracture pressure of the formation, the formation will crack and form fractures, or expand the natural fractures of the formation. Then, the acidic liquid enters the fractures, continues to fracturing, and chemically reacts with the rocks around the fractures, dissolves the soluble substances, removes the clogging substances in the fractures, improves and increases the seepage force of the formation, ...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B47/06E21B47/00
CPCE21B43/26E21B47/06E21B47/00
Inventor 任岚李高敏林然王振华肖静雯
Owner SOUTHWEST PETROLEUM UNIV
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