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Perforation parameter optimization method for maintaining balanced expansion of staged fracturing cracks of horizontal well

A technology of staged fracturing and optimization method, applied in design optimization/simulation, earthwork drilling, wellbore/well components, etc. Problems such as unstable field application effect

Active Publication Date: 2019-09-10
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Incorrect design of perforation parameters may exacerbate the unbalanced behavior of fracture propagation, and due to the existence of perforation abrasion, the effect of poorly designed perforation flow restriction method will gradually lose its effect during the fracturing process
At present, due to the lack of scientific and reasonable perforation parameter optimization design methods, most engineers can only design based on engineering experience, resulting in unstable field application of perforation flow-limiting method

Method used

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  • Perforation parameter optimization method for maintaining balanced expansion of staged fracturing cracks of horizontal well
  • Perforation parameter optimization method for maintaining balanced expansion of staged fracturing cracks of horizontal well
  • Perforation parameter optimization method for maintaining balanced expansion of staged fracturing cracks of horizontal well

Examples

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Effect test

Embodiment 1

[0110] Such as Figure 1-4 As shown, taking the 7th member of the XS shale gas well in the southern Sichuan area as an example, there are 3 clusters of perforations in the 7th member. A perforation parameter optimization method for maintaining the balanced expansion of staged fractures in horizontal wells, comprising the following steps:

[0111] S1: Collect and organize the geological and engineering conditions of the 7th section of shale gas well XS as shown in Table 1:

[0112] Table 1 Geological and engineering parameters of the 7th section of XS shale gas well

[0113]

[0114] Based on formula (1), the net inlet pressure value of the fracture in the fracturing section of the horizontal well is calculated as p i = 2.25MPa.

[0115] S2: Calculate the minimum horizontal principal stress difference σ in the fracturing section based on the well logging data based on formula (2) d is 1.1MPa, and the distance attenuation factor G calculated based on formula (4) is 0.5466...

Embodiment 2

[0123] Such as Figure 5 As shown, taking tight oil well CP 1 in Northeast China as an example, there are 3 clusters of perforations in the first section. A perforation parameter optimization method for maintaining the balanced expansion of staged fractures in horizontal wells, comprising the following steps:

[0124] S1: Collect and sort out the geological and engineering conditions of the first section of CP in tight oil wells, as shown in Table 3:

[0125]Table 3. Geological and engineering parameters of the first section of CP in an example tight oil well

[0126]

[0127] According to formula (1), the net inlet pressure value of the fracture in the fracturing section of the horizontal well is calculated as p i = 6.04MPa.

[0128] S2: Well logging data show that the stress homogeneity of the first section of the well is good, and the minimum horizontal principal stress difference σ in the fracturing section is calculated based on formula (2) d =0MPa, according to th...

Embodiment 3

[0134] Such as Image 6 As shown, taking the CP 3rd member of the tight oil well in Northeast China as an example, there are 3 clusters of perforations in the 3rd member. A perforation parameter optimization method for maintaining the balanced expansion of staged fractures in horizontal wells, comprising the following steps:

[0135] S1: Collect and sort out the geological and engineering conditions of the third section of CP in tight oil wells, as shown in Table 4:

[0136] Table 4 Geological and engineering parameters of the 3rd section of CP in an example tight oil well

[0137]

[0138] According to formula (1), the net inlet pressure value of the fracture in the fracturing section of the horizontal well is calculated as p i = 6.04MPa.

[0139] S2: Well logging data show that the stress homogeneity of the third section of the well is good, and the minimum horizontal principal stress difference σ in the fracturing section is calculated based on formula (2) d =0MPa, a...

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Abstract

The invention discloses a perforation parameter optimization method for maintaining balanced expansion of staged fracturing cracks of a horizontal well. The perforation parameter optimization method comprises the following steps: S1, estimating an inlet net pressure value of the fracturing cracks of the horizontal well; s2, calculating a perforation hole friction coefficient required for maintaining balanced expansion of the horizontal well fracturing cracks; s3, calculating perforation characteristic parameters; s4, determining optimal perforation parameters; s5, establishing a complete fluid-solid coupling hydraulic fracture expansion calculation model; and S6, predicting and evaluating the fracturing effect of the target block after the optimized perforation parameters are adopted. According to the method, the stress field heterogeneity, fluid-solid coupling in the dynamic hydraulic fracture expansion process and the multi-fracture stress shadow effect are considered, the influencecaused by the perforation hole abrasion phenomenon is also considered, the method can be effectively used for maintaining fracture balance expansion of horizontal well staged fracturing, operation iseasy, and practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a perforation parameter optimization method for maintaining the balanced expansion of staged fracturing fractures in horizontal wells. Background technique [0002] At present, staged fracturing of horizontal wells is one of the most effective technical means for developing unconventional low-permeability oil and gas reservoirs. By densely laying perforation clusters in the fracturing section, engineers hope that the technology can form densely distributed hydraulic fracture groups in the target area to greatly increase the fracture area and oil and gas production. However, in recent years, based on monitoring data, engineers have realized that in the process of staged fracturing of horizontal wells, relatively serious fracture propagation imbalance behaviors often occur. In the process of hydraulic fracturing, most of the fracturing fluid only flows into i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21B43/26
CPCE21B43/26G06F2119/06G06F30/20G01V2210/646G01V2210/66G06F2111/10E21B43/11E21B43/119E21B2200/20G01V20/00E21B49/00
Inventor 陈曦宇赵金洲李勇明江有适许文俊符东宇
Owner SOUTHWEST PETROLEUM UNIV
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