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A method for determining the opening sequence and opening efficiency of perforation clusters in fracturing intervals

A technology for fracturing intervals and perforation clusters, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., which 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 opening sequence research and judgment, to achieve the effect of improving the effect of production increase and transformation, novel design concept, and good operability

Active Publication Date: 2022-07-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • A method for determining the opening sequence and opening efficiency of perforation clusters in fracturing intervals
  • A method for determining the opening sequence and opening efficiency of perforation clusters in fracturing intervals
  • A method for determining the opening sequence and opening efficiency of perforation clusters in fracturing intervals

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Embodiment 1

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

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

[0051]

[0052] Among them, Re is the Reynolds numb...

Embodiment 2

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

[0082] Table 1. The perforation parameters of each cluster

[0083]

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

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Abstract

The invention discloses a method for determining the opening sequence and opening efficiency of perforation clusters in a fracturing interval, including the following steps: calculating the friction resistance of each perforation cluster in a fracturing interval: including the friction along the wellbore during fracturing construction, Calculation of borehole friction and bending friction near wellbore; mathematical modeling of hydrodynamic balance of the system: under the condition of actual displacement on site, the calculation method of each cluster friction is applied to obtain the hydrodynamic pressure distribution along the wellbore to the fracture. Considering the coupling effect of flow and pressure of each cluster, whether each perforation cluster can be effectively opened and its opening sequence are judged by the balance relationship between system friction and fracture pressure; The dynamic balance mathematical model judges the opening sequence and opening efficiency of perforation clusters. The invention can effectively judge the opening sequence and opening efficiency of each cluster of fractures under the condition of heterogeneous stress of the reservoir.

Description

technical field [0001] The invention relates to a method for determining the opening sequence and opening efficiency of perforation clusters in a fracturing interval, and belongs to the technical field of stimulation and stimulation of unconventional oil and gas reservoirs. Background technique [0002] The effective development of shale oil and gas resources is inseparable from the fracturing and stimulation operation. The quality of the fracturing effect directly affects the success or failure of the production capacity construction. How to effectively determine whether the fracturing perforation cluster is successfully opened or not and the sequence of opening are urgent for the current fracturing project. It is of great significance to improve the efficiency of shale gas development by taking appropriate optimization measures according to the objective problems that need to be solved to improve the stimulation effect. [0003] At present, the shale fracturing process is ...

Claims

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Application Information

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Patent Type & Authority Patents(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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