CN-122014192-A - Volcanic horizontal well fracturing dessert selection method and fracturing method

CN122014192ACN 122014192 ACN122014192 ACN 122014192ACN-122014192-A

Abstract

The invention relates to the field of oil and gas field development, and discloses a volcanic horizontal well fracturing dessert selecting method and a fracturing method, wherein the method comprises the steps of obtaining a directional drilling well inlet section and a composite drilling well inlet section of a target horizontal well; correcting the mechanical specific energy of the directional drilling well section according to the mechanical specific energy of the composite drilling well section to obtain the mechanical specific energy of the directional drilling well section after correction, obtaining the first mechanical specific energy of the target horizontal well after correction based on the mechanical specific energy of the directional drilling well section after correction and the mechanical specific energy of the composite drilling well section, and selecting fracturing desserts based on the first mechanical specific energy. Since the mechanical specific energy of the directional drilling section can be modified, the influence of the drilling mode on the mechanical specific energy can be eliminated. Furthermore, the first mechanical specific energy of the target horizontal well obtained after correction can truly reflect the reservoir compressibility, so that the accuracy of the selection of the fracturing dessert can be improved.

Inventors

YANG JING
ZHANG CHONG
ZHOU JIAJIA
SHI LEI
QIN XU
MIAO MINGMING

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司东北油气分公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The method for selecting the fracturing dessert of the volcanic horizontal well is characterized by comprising the following steps of: acquiring a directional drilling section and a composite drilling section of a target horizontal well; Correcting the mechanical specific energy of the directional drilling well section according to the mechanical specific energy of the composite drilling well section to obtain the corrected mechanical specific energy of the directional drilling well section; obtaining a first mechanical specific energy of the target horizontal well after correction based on the mechanical specific energy of the directional drilling interval after correction and the mechanical specific energy of the composite drilling interval; a fracturing dessert is selected based on the first mechanical specific energy.
2. The method of claim 1, wherein the modifying the mechanical specific energy of the directional drilling interval according to the mechanical specific energy of the composite drilling interval to obtain the modified mechanical specific energy of the directional drilling interval comprises: drawing a scatter diagram by taking the mechanical specific energy of each point in the directional drilling section as an abscissa and the mechanical specific energy of each point in the composite drilling section as an ordinate; Fitting the scatter diagram to obtain a relation between the mechanical specific energy of the directional drilling section and the mechanical specific energy of the composite drilling section; and obtaining the mechanical specific energy of the corrected directional drilling well section based on the relation.
3. The method of claim 2, wherein the fitting comprises a linear fitting, and wherein the relationship between the mechanical specific energy of the directional drilling interval and the mechanical specific energy of the composite drilling interval is: E c ＝aE d +b; wherein E d is the mechanical specific energy of the directional drilling section, E c is the mechanical specific energy of the composite drilling section, and a and b are obtained by linear fitting.
4. The method of selecting a fractured dessert of a horizontal well of volcanic of claim 1, wherein after said obtaining the modified first mechanical specific energy of the target horizontal well, the method further comprises: determining target drilling stages corresponding to each drill bit in the drilling route of the target horizontal well, and determining the initial drilling stage, the middle drilling stage and the final drilling stage of each target drilling stage; Correcting the first mechanical specific energy of the initial stage of drilling according to the first mechanical specific energy of the middle stage of drilling aiming at any target drilling stage to obtain the mechanical specific energy after the initial stage of drilling is corrected; correcting the first mechanical specific energy of the final drilling stage according to the first mechanical specific energy of the middle drilling stage to obtain the corrected mechanical specific energy of the final drilling stage; Obtaining a second mechanical specific energy after the target drilling stage correction based on the mechanical specific energy after the initial drilling stage correction, the first mechanical specific energy at the mid drilling stage, and the mechanical specific energy after the final drilling stage correction; Obtaining a corrected second mechanical specific energy of the target horizontal well based on the corrected second mechanical specific energy of each target drilling stage; and selecting a fracturing dessert based on the modified second mechanical specific energy of the target horizontal well.
5. The method of claim 4, wherein the correcting the first mechanical specific energy at the initial stage of drilling according to the first mechanical specific energy at the mid-drilling stage to obtain the corrected mechanical specific energy at the initial stage of drilling comprises: Drawing a scatter diagram corresponding to the middle drilling period in the initial drilling period by taking the first mechanical specific energy of each point in the initial drilling period as an abscissa and taking the first mechanical specific energy of each point in the middle drilling period as an ordinate; fitting a scatter diagram corresponding to the drilling initial stage and the drilling middle stage to obtain a first relation between a first mechanical specific energy of the drilling initial stage and a first mechanical specific energy of the drilling middle stage; Obtaining the mechanical specific energy after the initial drilling correction based on the first relation; and correcting the first mechanical specific energy of the drilling end according to the first mechanical specific energy of the drilling middle stage to obtain the mechanical specific energy after the drilling end correction, wherein the method comprises the following steps of: Drawing a scatter diagram corresponding to the middle drilling stage at the end drilling stage by taking the first mechanical specific energy of each point in the end drilling stage as an abscissa and the first mechanical specific energy of each point in the middle drilling stage as an ordinate; Fitting the scatter diagram corresponding to the drilling end stage and the drilling middle stage to obtain a second relation between the first mechanical specific energy of the drilling end stage and the first mechanical specific energy of the drilling middle stage; And obtaining the mechanical specific energy after the end-of-drilling correction based on the second relation.
6. The method of selecting a fractured dessert of a horizontal well of volcanic of claim 5, wherein the fitting comprises a linear fitting; The first relation between the first mechanical specific energy at the initial stage of drilling and the first mechanical specific energy at the middle stage of drilling is: E m2 ＝λ 1 E m1 +β 1 ; Wherein E m1 is the first mechanical specific energy at the initial stage of drilling, E m2 is the first mechanical specific energy at the middle stage of drilling, and lambda 1 and beta 1 are obtained by linear fitting; The second relation between the first mechanical specific energy at the end of drilling and the first mechanical specific energy at the middle of drilling is: E m2 ＝λ 2 E m3 +β 2 ; where E m3 is the first mechanical specific energy at the end of the drilling, lambda 2 and beta 2 are obtained from a linear fit.
7. The method of selecting a fractured dessert of a horizontal well of volcanic of claim 4, wherein after said obtaining the modified second mechanical specific energy of the target horizontal well, the method further comprises: drawing a second mechanical specific energy curve of the target horizontal well and an air measurement curve of the target horizontal well; and selecting a fracturing dessert based on the second mechanical specific energy curve and the gas detection curve.
8. A method of fracturing a horizontal well of volcanic rock, wherein the fracturing method is used to fracture a target horizontal well based on the fracturing dessert selected in claim 4, the target horizontal well comprising a first fracturing stage, the method comprising: Determining an average second mechanical specific energy of the first fracture segment; determining a reservoir type corresponding to the first fracturing segment according to the average second mechanical specific energy; and fracturing the first fracturing segment according to the reservoir type.
9. The method of volcanic horizontal-well fracturing according to claim 8, wherein before said determining the reservoir type to which said first fractured segment corresponds according to said average second mechanical specific energy, said method further comprises: determining a second mechanical specific energy and a brittleness index of the measured horizontal well; Establishing a correspondence of the second mechanical specific energy to the brittleness index; the determining the reservoir type corresponding to the first fracturing segment according to the average second mechanical specific energy comprises the following steps: and determining a brittleness index corresponding to the average second mechanical specific energy according to the average second mechanical specific energy and the corresponding relation, and determining the reservoir type corresponding to the first fracturing segment according to the brittleness index.
10. The method of fracturing a horizontal well of volcanic rock of claim 9, wherein prior to determining the reservoir type corresponding to the first fractured zone based on the average second mechanical specific energy, the method further comprises obtaining lithology of the well being logged and lithology of the target horizontal well; said establishing a correspondence of said second mechanical specific energy to said brittleness index comprises: Respectively aiming at each lithology, establishing a corresponding relation between the second mechanical specific energy and the brittleness index; Said determining a brittleness index corresponding to said average second mechanical specific energy from said average second mechanical specific energy and said correspondence comprises: and determining a target corresponding relation corresponding to lithology of the target horizontal well from the corresponding relations, and determining a brittleness index corresponding to the average second mechanical specific energy according to the average second mechanical specific energy and the target corresponding relation.

Description

Volcanic horizontal well fracturing dessert selection method and fracturing method Technical Field The invention relates to the field of oil and gas field development, in particular to a volcanic horizontal well fracturing dessert selecting method and a volcanic horizontal well fracturing method. Background In the process of volcanic gas reservoir development, the horizontal well is mostly improved by staged fracturing to realize yield increase. Because of strong transverse and longitudinal heterogeneity of the volcanic reservoir, the gas-containing property and the compressibility difference of the horizontal well plane are very large, and the selection of the positions of fracturing desserts is critical to the success rate of fracturing construction and the post-fracturing yield increasing effect when staged fracturing transformation is carried out. At present, the horizontal well generally utilizes logging interpretation data to calculate rock mechanical parameters and judge compressibility. For a horizontal well of a volcanic gas reservoir which is not well-logged, the compressibility cannot be evaluated by calculating the relevant horizontal stress. Meanwhile, due to lithology influence, the radioactive elements identified by the GR curve cannot effectively identify the lithology of the volcanic rock, so that the GR curve single-factor compressibility judgment method for sandstone and shale reservoirs cannot be applied to the volcanic rock reservoirs. Thus, a typical volcanic reservoir may utilize the mechanical specific energy to determine the reservoir's compressibility, and then select a fracturing dessert based on the reservoir's compressibility. The main consideration in calculating the mechanical specific energy is the weight on bit, the rotating speed of a rotating disc, the mechanical drilling speed and the sliding friction coefficient of a drill bit, but other influencing factors such as drilling modes are ignored, so that the calculation result of the mechanical specific energy is inaccurate, the reservoir compressibility cannot be accurately reflected, on one hand, the selection of fracturing desserts is inaccurate, on the other hand, the fracturing process cannot be selected pertinently, and finally the post-pressure productivity of a horizontal well is seriously influenced. Disclosure of Invention The invention aims to solve the problem that the selection of fracturing desserts is inaccurate due to the fact that the calculation result of mechanical specific energy in the prior art cannot accurately reflect the compressibility of a reservoir, and provides a volcanic horizontal well fracturing dessert selection method and a volcanic horizontal well fracturing method. In order to achieve the above object, an aspect of the present invention provides a method for selecting a fracturing dessert of a horizontal well of volcanic rock, including: acquiring a directional drilling section and a composite drilling section of a target horizontal well; Correcting the mechanical specific energy of the directional drilling well section according to the mechanical specific energy of the composite drilling well section to obtain the corrected mechanical specific energy of the directional drilling well section; obtaining a first mechanical specific energy of the target horizontal well after correction based on the mechanical specific energy of the directional drilling interval after correction and the mechanical specific energy of the composite drilling interval; a fracturing dessert is selected based on the first mechanical specific energy. In an embodiment of the present application, the correcting the mechanical specific energy of the directional drilling section according to the mechanical specific energy of the composite drilling section to obtain the corrected mechanical specific energy of the directional drilling section includes: drawing a scatter diagram by taking the mechanical specific energy of each point in the directional drilling section as an abscissa and the mechanical specific energy of each point in the composite drilling section as an ordinate; Fitting the scatter diagram to obtain a relation between the mechanical specific energy of the directional drilling section and the mechanical specific energy of the composite drilling section; and obtaining the mechanical specific energy of the corrected directional drilling well section based on the relation. In an embodiment of the application, the fitting comprises a linear fitting, and the relationship between the mechanical specific energy of the directional drilling interval and the mechanical specific energy of the composite drilling interval is: Ec＝aEd+b; wherein E d is the mechanical specific energy of the directional drilling section, E c is the mechanical specific energy of the composite drilling section, and a and b are obtained by linear fitting. In an embodiment of the present application, after the obtaining the first mechanical spe