CN-121998151-A - Crack leakage risk prediction method and device

CN121998151ACN 121998151 ACN121998151 ACN 121998151ACN-121998151-A

Abstract

The application discloses a method and a device for predicting a crack leakage risk, wherein the method comprises the steps of determining a stratum profile to be drilled based on stratum profile data to be drilled, determining historical leakage positions of corresponding layers in the stratum profile to be drilled according to well leakage data of a comparison well, identifying cracks of the comparison well through crack identification parameters and the historical leakage positions, determining leakage weak layer positions of different layers, determining risk quantification values of leakage risk layers to be drilled based on the leakage weak layer positions of the different layers of the comparison well through preset quantification value calculation rules, and determining leakage risk layers to be drilled and corresponding risk grades based on the risk quantification values of the leakage risk layers to be drilled through preset discrimination rules. The method can be used for predicting the potential lost circulation risk at the continuous depth to be drilled.

Inventors

ZHANG KUNZHEN
GUO YUNFENG
WANG YUFU
Wang shu
ZHENG YUCHAO
GAO WEIPENG

Assignees

中石化石油工程技术服务股份有限公司
中石化经纬有限公司
中石化经纬有限公司中原测控公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. A method of predicting risk of leakage of a fracture, the method comprising: determining a stratum profile diagram to be drilled based on stratum profile data to be drilled; determining the historical leakage position of the corresponding layer of the to-be-drilled well in the stratum profile according to the lost circulation data of the comparison well; Identifying the cracks of the comparison well through the crack identification parameters and the historical leakage positions, and determining the leakage weak layer positions of different layers; determining a risk quantization value of the leakage risk layer to be drilled based on the leakage weak layer positions of different layers of the comparison well through a preset quantization value calculation rule; And determining the leakage risk level and the corresponding risk level of the to-be-drilled well based on the risk quantification value of the leakage risk layer of the to-be-drilled well through a preset judging rule.
2. The method of claim 1, wherein determining the historical leak-off location of the corresponding horizon in the cross-sectional view of the formation to be drilled based on lost circulation data for the comparison well comprises: Acquiring lost circulation data of a comparison well, wherein the lost circulation data comprises lost circulation positions; and according to different horizons, carrying out well connection comparison on the comparison well and the to-be-drilled well, mapping the leak-off position of the comparison well to the corresponding horizon to be drilled, and determining the historical leak-off position of the corresponding horizon in the stratum profile to be drilled.
3. The method of claim 1, wherein identifying the fracture of the comparison well by the fracture identification parameter and the historical leak-off location, determining a leak-off weak layer location for a different horizon, comprises: Identifying the cracks of the comparison wells according to the calculation mode of the crack identification parameters, and determining crack layers corresponding to different crack identification parameters in each comparison well; And determining the positions of the leakage weak layers on different layers of the fracture layers corresponding to the different fracture identification parameters in each comparison well based on the fracture layers corresponding to the different fracture identification parameters in each comparison well and the historical leakage positions.
4. The method of claim 3, wherein the determining the risk quantification value of the leakage risk layer to be drilled based on the leakage weak layer positions of the different horizons of the comparison well by a preset quantification value calculation rule comprises: According to different horizons, carrying out well connection comparison on each comparison well and the to-be-drilled well respectively, mapping the positions of the leakage weak layers of each comparison well on the different horizons to the corresponding horizon to be drilled well, and determining the positions of the leakage weak layers of each comparison well on the to-be-drilled well, which are determined based on the same crack identification parameters; And determining the leakage risk layer to be drilled and the risk quantized value of the leakage risk layer based on the positions of the leakage weak layers, which are determined by the comparison wells based on the same crack identification parameters, on the positions on the to-be-drilled well through a preset quantized value calculation rule.
5. The method according to claim 1, wherein the determining the leakage risk level and the corresponding risk level of the to-be-drilled well based on the risk quantification value of the leakage risk level of the to-be-drilled well by the preset discrimination rule includes: Determining the risk relative quantized values of the leakage risk layers of different crack identification parameters in the well to be drilled based on the risk quantized values of the leakage risk layers of the well to be drilled in a preset risk relative quantized value calculation mode; and determining the leakage risk level and the corresponding risk level of the to-be-drilled well based on the risk relative quantification values of the leakage risk layers of different crack identification parameters in the to-be-drilled well through a preset judging rule.
6. The method according to claim 5, wherein the determining the leakage risk level and the corresponding risk level of the to-be-drilled well based on the risk relative quantization values of the leakage risk levels of the different fracture identification parameters in the to-be-drilled well by the preset discrimination rules includes: adding the risk relative quantized values of the leakage risk layers of different crack identification parameters in the to-be-drilled well, and determining the sum of the risk relative quantized values of the leakage risk layers of the to-be-drilled well; determining the comprehensive leakage risk index to be drilled based on the sum of the risk relative quantized values of the leakage risk layers to be drilled through a preset comprehensive leakage risk index calculation mode; And determining the leakage risk level and the corresponding risk level of the well to be drilled based on the comprehensive leakage risk index of the well to be drilled through a preset judging rule.
7. The method of claim 1, wherein determining a profile of the formation to be drilled based on profile data of the formation to be drilled comprises: determining stratum data and borehole track data of a comparison well according to geological and engineering design information; Determining the predicted section to be drilled according to stratum data of the comparison well and the well track data; And determining the stratum profile diagram to be drilled based on the predicted profile to be drilled and the stratum profile data to be drilled.
8. A crack leakage risk prediction device, the device comprising: The stratum profile determining module is used for determining stratum profile to be drilled based on stratum profile data to be drilled; The historical leakage position determining module is used for determining the historical leakage position of the corresponding layer of the stratum profile to be drilled according to the lost circulation data of the comparison well; the leakage weak layer position determining module is used for identifying the cracks of the comparison well through the crack identification parameters and the historical leakage positions, and determining the positions of the leakage weak layers of different layers; The risk quantification value determining module is used for determining the risk quantification value of the leakage risk layer to be drilled based on the leakage weak layer positions of different layers of the comparison well through a preset quantification value calculation rule; The risk level determining module is used for determining the leakage risk level to be drilled and the corresponding risk level based on the risk quantification value of the leakage risk level to be drilled through a preset judging rule.
9. A crack leakage risk prediction apparatus, the apparatus comprising: A memory for storing a computer program; A processor for executing the computer program to cause the apparatus to perform the crack leakage risk prediction method according to any one of claims 1 to 7.
10. A computer storage medium, wherein a computer program is stored in the computer storage medium, which when executed by a processor, implements the crack leakage risk prediction method according to any one of claims 1 to 7.

Description

Crack leakage risk prediction method and device Technical Field The application relates to the technical field of drilling engineering, in particular to a method and a device for predicting crack leakage risk. Background Lost circulation refers to one of the common and intractable down-hole complications of various working fluids, such as drilling fluids, cement slurries, completion fluids, etc., entering the formation directly under differential pressure during down-hole operations such as drilling, cementing, testing or workover. The lost circulation is most common in terms of fractured loss, and if lost circulation occurs in the drilling process, the drilling cost is increased, and the engineering progress of safe and rapid drilling can be affected. At present, lost circulation risk prediction is an important research direction in petroleum drilling engineering, and the early prediction of the fractured loss is mostly based on the oil and gas reservoir, takes a buried hill and an unconventional reservoir as research objects, and lacks the fractured loss prediction taking a stratum as research objects. Whereas the advance predictions of the formation as a subject of investigation are mostly based on formation-related parameters. However, in the practical application process, partial parameters at the longitudinal continuous depth are difficult to obtain, the condition of incomplete parameters easily occurs, and the method is not suitable for pre-drilling prediction at the continuous depth to be drilled. As such, how to provide a way to enable prediction of potential lost circulation risk at continuous depths to be drilled prior to drilling is a current challenge. Disclosure of Invention In view of the above, the embodiment of the application provides a method and a device for predicting the risk of leakage of a fracture, which aim to realize the prediction of the risk of potential well leakage on the continuous depth to be drilled. In a first aspect, an embodiment of the present application provides a method for predicting risk of leakage of a crack, where the method includes: determining a stratum profile diagram to be drilled based on stratum profile data to be drilled; determining the historical leakage position of the corresponding layer of the to-be-drilled well in the stratum profile according to the lost circulation data of the comparison well; Identifying the cracks of the comparison well through the crack identification parameters and the historical leakage positions, and determining the leakage weak layer positions of different layers; determining a risk quantization value of the leakage risk layer to be drilled based on the leakage weak layer positions of different layers of the comparison well through a preset quantization value calculation rule; And determining the leakage risk level and the corresponding risk level of the to-be-drilled well based on the risk quantification value of the leakage risk layer of the to-be-drilled well through a preset judging rule. In a second aspect, an embodiment of the present application provides a device for predicting risk of leakage of a fracture, where the device includes: The stratum profile determining module is used for determining stratum profile to be drilled based on stratum profile data to be drilled; The historical leakage position determining module is used for determining the historical leakage position of the corresponding layer of the stratum profile to be drilled according to the lost circulation data of the comparison well; the leakage weak layer position determining module is used for identifying the cracks of the comparison well through the crack identification parameters and the historical leakage positions, and determining the positions of the leakage weak layers of different layers; The risk quantification value determining module is used for determining the risk quantification value of the leakage risk layer to be drilled based on the leakage weak layer positions of different layers of the comparison well through a preset quantification value calculation rule; The risk level determining module is used for determining the leakage risk level to be drilled and the corresponding risk level based on the risk quantification value of the leakage risk level to be drilled through a preset judging rule. In a third aspect, an embodiment of the present application provides a crack leakage risk prediction apparatus, including: A memory for storing a computer program; A processor, configured to execute the computer program, so that the apparatus performs the method for predicting risk of leakage of cracks according to the first aspect. In a fourth aspect, an embodiment of the present application provides a computer storage medium, where a computer program is stored, and when the computer program is executed, a device running the computer program implements the method for predicting risk of leakage of cracks according to the first aspect. Compared wi