Method for determining opening sequence and opening efficiency of perforation clusters of fractured intervals

A technology for fracturing intervals and perforation clusters, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problem of effectively distinguishing whether the perforation clusters are effectively opened or not, and whether there are no fracturing perforation clusters. Whether to open or not and the order of opening and other issues, to achieve the effect of novel design concept, easy calculation method, and convenient method

Active Publication Date: 2020-10-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, relying on microseismic monitoring, it is difficult to effectively distinguish whether each perforation cluster is effectively opened and their opening sequence.
After searching, it is found that there is currently no relevant method or measure for judging whether the fracturing and perforation clusters are opened or not and the order of opening in the existing technology

Method used

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  • Method for determining opening sequence and opening efficiency of perforation clusters of fractured intervals
  • Method for determining opening sequence and opening efficiency of perforation clusters of fractured intervals
  • Method for determining opening sequence and opening efficiency of perforation clusters of fractured intervals

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Embodiment 1

[0049] The methods for determining the opening sequence and opening efficiency of the perforation clusters in the fracturing section include: the calculation method of the friction resistance of each perforation cluster in the fracturing section, the mathematical modeling of the hydrodynamic balance of the system, and the research and interpretation of the opening sequence and opening efficiency of the perforation clusters. The key methods and technical components are as follows:

[0050] The new method for calculating the friction of each perforation cluster in the fracturing interval mainly includes new methods for calculating the friction along the wellbore, perforation friction, and near-wellbore bending friction during fracturing. First, the formula for calculating friction along the wellbore during the construction process from cluster (i-1) to cluster (i) is:

[0051]

[0052] Among them, Re is the Reynolds number, and its calculation formula is:

[0053] Secondly...

Embodiment 2

[0081] Well A, a shale gas well in a block in the south, is 5012 m deep, with a horizontal section length of 2100 m and a vertical depth of 3106 m. It is divided into 24 stages of fracturing, of which 7 clusters are perforated in the 12th segment. The horizontal stress distribution and perforation parameters of each cluster are shown in Table 1. As shown, the fracturing fluid is slick water with a density of 1.03g / cm 3 , viscosity is 1.6mPas, flow coefficient C d =0.85, casing inner diameter 114.3mm, construction displacement 14m 3 / min, the wellhead pressure is 78MPa.

[0082] Table 1 Perforation parameters of each cluster

[0083]

[0084] According to the implementation method of the present invention, the in-situ stresses of the 7 clusters of perforation positions are first sorted in ascending order, and then through trial calculation and judgment, the final result is obtained at the displacement of 14m 3 The opening sequence and efficiency of each perforation cluste...

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Abstract

The invention discloses a method for determining the opening sequence and the opening efficiency of perforation clusters of fractured intervals. The method includes the following steps that friction drag of all the perforation clusters of the fractured intervals is calculated, wherein shaft along-way friction drag, hole friction drag and near-well bending friction drag in the fracturing construction process are calculated; system hydro-power balance mathematical modeling is carried out, wherein under actual scene displacement conditions, hydro-power pressure distribution along a shaft into a seam is acquired with a cluster friction drag calculation method, the mutual coupling effect of flow and pressure of all the clusters is considered according to construction total displacement conservation, and whether all the perforation clusters can be effectively opened or not and the opening sequence of the perforation clusters are judged according to the system friction drag and intra-seam pressure balance relationship; and the opening sequence and the opening efficiency of the perforation clusters are judged and explained, wherein a system hydro-power balance mathematical model is used for judging the opening sequence and the opening efficiency of the perforation clusters. The opening sequence and the opening efficiency of all cluster cracks under the reservoir stress heterogeneous condition can be effectively judged.

Description

technical field [0001] The invention relates to a method for determining the opening sequence and opening efficiency of perforation clusters in fracturing intervals, and belongs to the technical field of stimulation and reconstruction of unconventional oil and gas reservoirs. Background technique [0002] The effective development of shale oil and gas resources is inseparable from fracturing stimulation operations. The quality of fracturing effects directly affects the success or failure of production capacity construction. How to effectively judge whether the fracturing perforation clusters are successfully opened or not and the opening sequence is an urgent issue in current fracturing projects. The objective problem to be solved, taking appropriate optimization measures based on the research and judgment results to improve the stimulation effect is of great significance to improve the benefits of shale gas development. [0003] At present, the shale fracturing technology i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B49/00G06F30/20G06F119/14
CPCE21B43/26E21B49/00G06F30/20G06F2119/14
Inventor 何封张庆李彦超肖剑锋邓才
Owner BC P INC CHINA NAT PETROLEUM CORP
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