CN-121997787-A - Method, system, computer equipment and medium for calculating opening quantity of holes

CN121997787ACN 121997787 ACN121997787 ACN 121997787ACN-121997787-A

Abstract

The invention provides a method, a system, computer equipment and a medium for calculating the opening quantity of holes, wherein the method comprises the steps of obtaining a seam pressure calculation equation through coupling, carrying out adjacent twice displacement, obtaining the opening quantity calculation equation through coupling, adopting the obtained opening quantity calculation equation, calculating the opening quantity N1 of a temporary plugging material in a pump stopping stage before adding the temporary plugging material, the remaining opening quantity N2 of the pump stopping stage after adding the temporary plugging material and the newly opening quantity N3 of the pump stopping stage after adding the temporary plugging material in each stage of fracturing construction process, obtaining the plugging material plugging hole quantity N4 according to the hole quantity N1 and the hole quantity N2, and obtaining the total hole opening quantity N5 after finishing construction according to the hole quantity N3 and the hole quantity N4. The system comprises a data collection module, a data processing module and a digital display module which are sequentially connected. The invention has the advantage of being capable of being popularized and applied in a large scale.

Inventors

ZHAN LI
YOU WEI
HE LE
QIAN BIN
GUAN BIN
REN YONG
QI TIANJUN
YUAN CANMING
WANG RONG
WANG SUBING

Assignees

中国石油天然气集团有限公司
中国石油集团川庆钻探工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A method for calculating the number of shale gas fracture openings, the method comprising the steps of: S1, coupling a calculation equation of wellhead pressure, aperture friction, aperture diameter, aperture flow coefficient, shaft friction and shaft hydrostatic column pressure to obtain a seam pressure calculation equation; S2, adopting a certain step displacement to perform adjacent two-step stop displacement or step rise displacement, wherein the two-time seam pressure is equal, and coupling seam pressure calculation equations under the adjacent two-time displacement to obtain an aperture opening quantity calculation equation; s3, calculating the number N1 of open holes in the stage of stopping the pump before adding temporary plugging materials, the number N2 of remaining open holes in the stage of starting the pump after adding and the number N3 of newly open holes in the stage of stopping the pump after adding in the fracturing construction process by adopting the hole opening number calculation equation in the step S2; s4, obtaining the number N4 of the holes plugged by the temporary plugging material according to the number N1 of the holes and the number N2 of the holes; S5, obtaining the total opening quantity N5 of the holes after construction according to the quantity N3 of the holes and the quantity N4 of the holes.
2. The method of calculating the number of open holes in shale gas fracturing according to claim 1, wherein the equation of calculation of the number of open holes is shown in formula (1): Wherein N is the number of open holes, P is the density of fracturing fluid, kg/M 3 ;q 1 is the first displacement of fracturing fluid injection displacement, M 3 /min;q 2 is the second displacement of fracturing fluid injection displacement, M 3 /min, D is the diameter of the sleeve, M, D i is the initial equivalent diameter of the holes, M is the sand feeding quantity of the holes, kg, P k1 is the wellhead pressure of the first displacement, MPa, and P k2 is the wellhead pressure of the second displacement, MPa.
3. The method of calculating the number of shale gas fracture openings according to claim 1, wherein the seam pressure calculation equation is shown in formula (2): Wherein P w is the seam pressure, MPa, P k is the wellhead pressure, P is the fracturing fluid density, kg/M 3 , q is the fracturing fluid injection displacement, M 3 /min, f is the fracturing fluid friction coefficient, dimensionless, L is the sleeve length, M, D is the sleeve diameter, M, g is the gravitational acceleration, 9.8N/kg, h is the vertical depth of a shaft, M, N is the number of open holes, dimensionless, D i is the initial equivalent diameter of the holes, M is the sand inlet quantity of the holes, and kg.
4. The method for calculating the opening quantity of shale gas fracturing holes according to claim 1, wherein in the fracturing construction process of each section, a pump stopping step is performed in a mode of stopping displacement twice adjacent before temporary plugging material is added to obtain wellhead pressure values under different displacement twice adjacent, a pump starting step is performed in a mode of lifting displacement twice adjacent step after temporary plugging material is added to obtain wellhead pressure values under different displacement twice adjacent, and a pump stopping step is performed in a mode of reducing displacement twice adjacent step after temporary plugging material is added to obtain wellhead pressure values under different displacement twice adjacent.
5. The method of calculating the number of shale gas fracture openings according to claim 3, wherein the seam pressures at the two adjacent displacements are equal as shown in formula (3): P W1 ＝P W2 (3) Wherein, P w1 is the seam pressure of the first displacement and P w2 is the seam pressure of the first displacement and MPa.
6. The method for calculating the opening quantity of shale gas fracturing holes according to claim 1, wherein the certain step displacement in the step S2 comprises 1-2 m 3 /min.
7. A system for calculating the number of open shale gas fracturing holes is characterized by comprising a data collection module, a data processing module and a digital display module which are connected in sequence, The data collection module is configured to collect construction data and transmit the collected construction data to the data processing module; The data processing module adopts an eyelet opening quantity calculation equation, and calculates and obtains the number N1 of open eyelets in a pump stopping stage before temporary plugging material is added, the number N2 of remaining open eyelets in a pump starting stage after temporary plugging material is added, the number N3 of newly open eyelets in a pump stopping stage after temporary plugging material is added, the number N4 of closed eyelets of temporary plugging material and the total eyelet opening number N5 after construction is finished in each stage of fracturing construction process according to construction data transmitted by the data collecting module; The digital display module is configured to receive and display the calculated data result of the data processing module.
8. The system for calculating the open number of shale gas fracturing apertures of claim 7, wherein the construction data collected by the data collection module comprises fracturing fluid injection displacement, fracturing fluid density, open aperture number, aperture equivalent diameter, aperture flow coefficient, aperture initial equivalent diameter, aperture sand intake, fracturing fluid friction coefficient, casing length, casing diameter and wellbore sag.
9. A computer device, the device comprising: processor, and A memory storing a computer program which, when executed by a processor, implements the method of calculating shale gas fracture opening count as claimed in any one of claims 1 to 6.
10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method of calculating the shale gas fracture opening count of any of claims 1-6.

Description

Method, system, computer equipment and medium for calculating opening quantity of holes Technical Field The invention relates to the field of petroleum engineering, in particular to a method, a system, computer equipment and a medium for calculating the opening quantity of holes. Background The temporary blocking steering fracturing technology among horizontal well clusters is a key means for realizing efficient exploitation of shale gas. The technology mainly aims at blocking the opened perforation holes through temporary plugging materials, so that the subsequent injection fluid is forced to turn to enter the unopened perforation holes, a new seam is opened, the complexity of the seam is increased, and the purpose of fully and uniformly reforming the horizontal well section is achieved. The method is an important mode for evaluating temporary plugging effect by calculating the opening quantity of the holes before and after temporary plugging. At present, the number of open holes after temporary plugging is mainly analyzed through an underground television imaging technology, the main principle of the technology is that after the temporary plugging fracturing construction is finished, an underground television is put into a shaft, the open hole condition is shot, and finally, the open hole result is presented on the ground in a picture mode. The method has the advantages of directly observing the opening shape, opening size and opening quantity of the holes at different positions, but has the defects of high cost, long time consumption and difficulty in large-scale popularization and use in the fracturing construction site. Meanwhile, the existing calculation model for the opening quantity of the holes based on the fracturing construction curve does not consider the influence of abrasion of the holes, and meanwhile, the quantity of the holes plugged after the temporary plugging material is added is difficult to calculate, so that the final calculation result is smaller. Aiming at the defects of the existing method, the invention provides a shale air pressure eyelet opening number calculation method considering an eyelet mode effect based on a fracturing construction curve obtained in real time in the fracturing construction process. The Chinese patent application with the application number of CN202211318196.X and the name of normal pressure shale gas multi-cluster fracturing ball throwing temporary plugging method, equipment and medium discloses a method capable of calculating total liquid amount to be injected before ball throwing according to the number of opened holes and the liquid amount of single-cluster cracks and determining ball throwing time. The method comprises the steps of carrying out a mechanical analysis experiment of a core in the pit, determining the number of perforation holes of each section, and calculating the number of the opened perforation holes after the front-end liquid is injected for making a seam. In the process of calculating the number of the opened holes, the influence of abrasion and other conditions of the holes is not considered, and the problem that the temporary plugging effect is deviated is possibly caused. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide a method for calculating the number of perforations opened with a higher reliability. As another example, another object of the present invention is to provide a system for calculating the number of shale gas fracturing perforations open with high operability. In order to achieve the aim, the invention provides a method for calculating the opening quantity of shale gas fracturing holes, which comprises the following steps of S1, obtaining a seam pressure calculation equation by coupling calculation equations of wellhead pressure, hole friction, hole diameter, hole flow coefficient, shaft friction and shaft hydrostatic column pressure, S2, adopting a certain step displacement, carrying out adjacent stepped displacement stopping or stepped displacement stopping by adopting a certain step displacement, obtaining a hole opening quantity calculation equation by coupling the seam pressure calculation equation under the adjacent two displacement stopping by adopting the equal step displacement of the two steps, S3, adopting the hole opening quantity calculation equation in the step S2, and calculating the number N1 of open holes in a pump stopping stage before temporary plugging material is added, the number N2 of remaining open holes in a pump starting stage after adding and the newly open holes N3 in a pump stopping stage after adding, S4, obtaining the number N4 of holes of temporary plugging material according to the number N3 of holes and the number N4 of holes, and obtaining the total number N5 of open holes after finishing the construction. According to one or more exempla