Volume fracturing horizontal well segmented clustering method and device

A volumetric fracturing and horizontal well technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as inability to initiate fractures, failure of fractures at fracturing points to meet target requirements, etc.

Active Publication Date: 2019-07-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Application Information

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Problems solved by technology

When the heterogeneity of the reservoir is weak, the uniform segmentation and clustering have little effect on the fracturing effect; but when the heterogeneity

Method used

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  • Volume fracturing horizontal well segmented clustering method and device
  • Volume fracturing horizontal well segmented clustering method and device
  • Volume fracturing horizontal well segmented clustering method and device

Examples

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Example Embodiment

[0029] Example one

[0030] The first embodiment of the present invention provides a volumetric fracturing horizontal well segmented clustering method, that is, a method for determining the fracturing position based on the segmented clustering of the horizontal well to be subjected to volume fracturing, refer to figure 1 As shown, including the following steps:

[0031] Step S11: Determine each preselected segmentation point of the section to be fractured according to the number of sections of the section to be fractured in the horizontal well.

[0032] The section to be fractured of a horizontal well refers to a certain section of the horizontal well that will undergo volume fracturing. Specifically, it is determined that each preselected segmentation point of the section to be fractured meets the following conditions:

[0033] The segment length between each two adjacent segment points is greater than or equal to the product of the minimum number of clusters in a segment and the aver...

Example Embodiment

[0075] Example two

[0076] The second embodiment of the present invention provides a method for determining the fracturing potential value of a horizontal well. The process is as follows: Figure 4 As shown, including the following steps:

[0077] Step S41: Obtain valid data for calculating the fracturing potential value of the horizontal well.

[0078] In one embodiment, the numerical value of each index of at least two depth points of the horizontal well may be obtained; wherein the index includes at least one index of rock mechanics characteristic index and petrophysical parameter index; rock mechanics characteristic The indicators include at least: Lame constant, strain energy release rate, brittleness index, and fracture toughness; the petrophysical parameter indicators include at least: oil saturation, permeability, and porosity.

[0079] Because the fracturing potential of the reservoir is affected by many factors such as rock mechanical characteristics and petrophysical param...

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Abstract

The invention discloses a volume fracturing horizontal well segmented clustering method and device. The method comprises the following steps of determining each pre-selected segmentation point according to the segmentation number of a to-be-fractured section of a horizontal well; judging whether the variance of the fracturing potential value of each well logging point between every two adjacent pre-selected subsection points is smaller than or equal to a preset variance threshold value or not; if not, re-determining each pre-selected segmentation point; for each screened fracturing subsection,determining each pre-selected clustering point of the fracturing subsection according to the minimum cluster spacing and the maximum cluster spacing corresponding to the reservoir type of the fracturing subsection, and judging whether the average value of the fracturing potential values corresponding to the pre-selected clustering points is greater than or equal to a preset first average value threshold; if yes, determining each pre-selected clustering point as a clustering point of the fracturing subsection; and if not, re-determining each pre-selected clustering point of the fracturing subsection. According to the method, the sections to be fractured of the horizontal well to be subjected to volume fracturing can be reasonably clustered in a segmented mode, and the fracturing design canbe better guided.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing design, in particular to a segmented clustering method and device for volume fracturing horizontal wells. Background technique [0002] At present, in the process of oil and gas production, volume fracturing of horizontal wells is an important means to improve the effective production of reservoirs and enhance the recovery rate, and the design of fracturing positions before fracturing, that is, the segmented and clustered design of horizontal wells Whether it is reasonable or not directly affects oil and gas production and ultimate recovery. [0003] At present, the existing segmentation and clustering design methods for horizontal wells have many limitations, and are usually uniform segmentation and clustering. When the heterogeneity of the reservoir is weak, the uniform segmentation and clustering have little effect on the fracturing effect; but when the heterogeneity of the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B43/26
CPCE21B43/26G06F30/20
Inventor 王文东苏玉亮张凯杰彭斐黄朝琴曾青冬
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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