Sequential optimization method and system for multi-stage fracturing of shale gas horizontal wells

Abstract

The present invention provides a method, system, electronic device and storage medium for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells. The method includes performing segmented fracturing on the wellbore of the horizontal well to form multiple fracturing sections perpendicular to the wellbore of the horizontal well; collecting information on multiple horizontal wells that penetrate the same fault in the target shale layer, and dividing the wellbore of the horizontal well penetrated by the fault into a pre-sequence fracturing section, a through-sequence fracturing section and a post-sequence fracturing section; obtaining the section information of the through-sequence fracturing section of each horizontal well; judging whether the through-sequence fracturing section of each horizontal well is located at the same section; selecting the corresponding fracturing method according to the judgment result to sequentially complete the fracturing of the pre-sequence fracturing section, the through-sequence fracturing section and the post-sequence fracturing section of each horizontal well, and performing synchronous fracturing on the through-sequence fracturing section of each horizontal well. The fracturing sequence optimization method of the present invention can effectively reduce the fracturing section loss caused by fault slip in the shale gas horizontal well, and effectively ensure the smooth progress of the multi-stage fracturing construction of the shale gas horizontal well.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and natural gas development, and in particular relates to a method, system, electronic equipment and storage medium for sequential optimization of multi-stage fracturing of shale gas horizontal wells. Background Art

[0002] Shale gas has large reserves in my country, a wide burial area, and huge potential for exploitation. The safe and efficient exploitation of shale gas can make a huge contribution to my country's natural gas self-sufficiency. Shale gas reservoirs are typical self-generating and self-storing gas reservoirs, and shale has the characteristics of low porosity and low permeability. Natural gas is stored in shale matrix and natural fractures, and basically has no self-flowing ability. In order to exploit shale gas, the production increase technology of multi-stage fracturing of horizontal wells is generally used for exploitation.

[0003] Most of my country's shale gas reservoirs are located in mountainous areas, and their underground geological conditions are very complex. Microcracks and microfaults are developed in shale reservoirs. During the multi-stage fracturing process, a large amount of fracturing fluid is injected into the shale reservoir to "break" the reservoir rock, artificially create cracks to form a complex fracture network, and increase the recoverable yield of the reservoir. However, the fracturing fluid will also enter the underground fault. Due to the impermeability of the fault, the pore pressure of the fault increases at this time, and the positive stress is mostly reduced. Secondly, due to the entry of the fracturing fluid, the friction coefficient in the fault core decreases, which causes the fault to be activated by fracturing and the occurrence of fault slip. Fault slip will cause shear deformation of the casing near the fault. Casing deformation causes engineering problems such as difficulty in lowering bridge plugs in shale gas horizontal wells and loss of fracturing sections. These phenomena greatly increase the duration of fracturing construction and reduce fracturing efficiency. At the same time, due to the occurrence of phenomena such as lost sections, the production of shale gas horizontal wells is reduced and the cost of well construction is increased, which seriously affects the safe and efficient development of shale gas horizontal wells.

[0004] At present, shale gas horizontal wells are mostly carried out in a "well factory" mode, with 3-4 wells being operated simultaneously on the same platform and side, and underground faults generally passing through 2-3 wells. Therefore, when a well is fracturing, the fracturing fluid enters the fault and causes slippage, and casing shear deformation occurs in adjacent wells, affecting the construction efficiency of adjacent wells. Summary of the invention

[0005] In view of the above-mentioned defects or shortcomings of the prior art, the present invention provides a method, system, electronic equipment and storage medium for sequential optimization of multi-stage fracturing of shale gas horizontal wells, so as to solve the technical problems of shear deformation of casing of adjacent wells and the accompanying loss of sections caused by fault slip when multiple wells are simultaneously fractured.

[0006] In order to achieve the above object, the present invention provides a method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells, comprising:

[0007] Performing staged fracturing on the horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore;

[0008] Collecting information of multiple horizontal wells penetrating the same fault in the target shale layer, and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section, and a post-sequence fracturing section;

[0009] Obtaining the segment position information of the through-fracturing segment of each of the horizontal wells;

[0010] Determining whether the through-fracture sections of each of the horizontal wells are located at the same section;

[0011] According to the judgment result, a corresponding fracturing method is selected to sequentially complete the fracturing of the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and the through fracturing section of each horizontal well is fractured synchronously.

[0012] In an embodiment of the present invention, the steps of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and synchronously fracturing the through fracturing section of each horizontal well include:

[0013] When the through-fracture sections of the horizontal wells are located at the same position, the preceding fracturing section of the horizontal wells is fractured individually, the through-fracture sections of the horizontal wells are fractured synchronously, and the subsequent fracturing section is fractured individually.

[0014] In an embodiment of the present invention, the step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and synchronously fracturing the through fracturing section of each horizontal well further includes:

[0015] When the through-fracturing sections of each horizontal well are located at the same position, the preceding fracturing section of each horizontal well is subjected to zipper fracturing, the through-fracturing section of each horizontal well is subjected to synchronous fracturing, and the subsequent fracturing section is subjected to zipper fracturing in sequence.

[0016] In an embodiment of the present invention, the step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and synchronously fracturing the through fracturing section of each horizontal well further includes:

[0017] When the through-fracture sections of the horizontal wells are located at the same position, the preceding fracturing section, the through-fracture section and the subsequent fracturing section of the horizontal wells are synchronously fractured in sequence.

[0018] In an embodiment of the present invention, the step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and synchronously fracturing the through fracturing section of each horizontal well further includes:

[0019] When the through-fracture sections of each horizontal well are located at different sections, the preceding fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the subsequent fracturing section is fractured individually.

[0020] In an embodiment of the present invention, the step of collecting information of multiple horizontal wells penetrating the same fault in the target shale layer and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section and a post-sequence fracturing section includes:

[0021] Obtain image information of faults in the target shale layer through seismic monitoring technology;

[0022] Acquiring image information of multiple horizontal wells located on the same platform of the target shale layer;

[0023] The penetration relationship between the multiple horizontal wells and the faults at the same platform is obtained according to the image information of the fault and the image information of the horizontal well.

[0024] In an embodiment of the present invention, a sequential optimization system for multi-stage fracturing of shale gas horizontal wells is also proposed, comprising:

[0025] An execution module, configured to perform staged fracturing on a horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore;

[0026] A collection module, used to collect information of multiple horizontal wells penetrating the same fault in the target shale layer, and divide the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section and a post-sequence fracturing section;

[0027] An acquisition module, used for acquiring the segment position information of the through-fracturing segment of each horizontal well;

[0028] A judgment module, used for judging whether the through-fracturing sections of the horizontal wells are located at the same section;

[0029] The selection module is used to select a corresponding fracturing method according to the judgment result to sequentially complete the fracturing of the preceding fracturing part, the through fracturing section and the subsequent fracturing part of each horizontal well, and the through fracturing section of each horizontal well is synchronously fractured.

[0030] In an embodiment of the present invention, the sequential optimization system for multi-stage fracturing of shale gas horizontal wells further comprises:

[0031] The first sub-acquisition module is used to obtain image information of the fault layer of the target shale layer through seismic monitoring technology;

[0032] The second sub-acquisition module is used to acquire image information of multiple horizontal wells located on the same platform of the target shale layer;

[0033] The third sub-acquisition module is used to obtain the penetration relationship between the multiple horizontal wells and the fault at the same platform according to the image information of the fault and the image information of the horizontal well.

[0034] In an embodiment of the present invention, an electronic device is also proposed, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that when the processor executes the program, the steps of the sequential optimization method for multi-stage fracturing of shale gas horizontal wells as described above are implemented.

[0035] In an embodiment of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the sequential optimization method for multi-stage fracturing of shale gas horizontal wells as described above are implemented.

[0036] Through the above technical solution, the method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells provided by the embodiment of the present invention has the following beneficial effects:

[0037] First, the horizontal wellbore is segmented and fractured to form multiple fracture sections perpendicular to the horizontal wellbore; information of multiple horizontal wells that penetrate the same fault in the target shale layer is collected, and the horizontal wellbore that the fault penetrates is divided into a pre-fracture section, a through-fracture section, and a post-fracture section; the section information of the through-fracture section of each horizontal well is obtained; it is determined whether the through-fracture section of each horizontal well is located in the same section; finally, according to the judgment result, the corresponding fracturing method is selected to sequentially complete the fracturing of the pre-fracture section, the through-fracture section, and the post-fracture section of each horizontal well, and the fracturing of the pre-fracture section needs to be completed before the synchronous fracturing of the through-fracture section of each horizontal well. The present invention can effectively reduce the loss of fracturing sections caused by fault slip in shale gas horizontal wells by synchronously fracturing the through-fracture sections of each horizontal well and optimizing the fracturing sequence of the fracturing sections.

[0038] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0040] Figure 1It is a schematic flow chart of a method for sequential optimization of multi-stage fracturing of shale gas horizontal wells according to an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of a fracturing operation in which a fault runs through two horizontal wells and the fracturing sections are located at the same section according to an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of a fracturing operation in which a fault penetrates two horizontal wells and penetrates fracturing sections located at different sections according to another embodiment of the present invention;

[0043] Figure 4 is a fracturing schematic diagram in which a fault runs through three horizontal wells and the fracturing sections are located at different sections according to another embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of the structural module connection of the sequential optimization system for multi-stage fracturing of shale gas horizontal wells of the present invention.

[0045] Description of Reference Numerals

[0046]

[0047] DETAILED DESCRIPTION

[0048] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] The following describes the sequential optimization method for multi-stage fracturing of shale gas horizontal wells according to the present invention with reference to the accompanying drawings.

[0050] See also Figure 1 In an embodiment of the present invention, a method for optimizing the sequence of multi-stage fracturing of a shale gas horizontal well is provided, which comprises:

[0051] Step S10: performing staged fracturing on the horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore;

[0052] Step S20: collecting information of multiple horizontal wells penetrating the same fault in the target shale layer, and dividing the wellbore of the horizontal well penetrating the fault into a pre-fracturing section, a penetrating fracturing section, and a post-fracturing section;

[0053] Step S30: obtaining the segment information of the through-fracture segment of each horizontal well;

[0054] Step S40: determining whether the through-fracture sections of each horizontal well are located at the same section;

[0055] Step S50: Select a corresponding fracturing method according to the judgment result to sequentially perform fracturing on the pre-sequence fracturing section, the through-sequence fracturing section and the post-sequence fracturing section of each horizontal well, and perform synchronous fracturing on the through-sequence fracturing section of each horizontal well.

[0056] A casing is provided on the outer periphery of the wellbore of the horizontal well, and a section of perforations is opened on the casing at a certain interval to form a fracturing section. The liquid in the horizontal well is injected into the shale layer through the fracturing of the fracturing section with high pressure, thereby forming cracks in the shale layer. Shale gas can continuously seep out from these generated micro-cracks, thereby realizing the exploitation of shale gas.

[0057] The present invention collects information about multiple horizontal wells that are penetrated by the same fault in the target shale layer, such as how many horizontal wells a fault penetrates at the same time, and which section of each horizontal well the fault penetrates. At present, shale gas horizontal wells are mostly carried out in a "well factory" mode, with 3-4 wells on the same platform and side being carried out simultaneously. Underground faults generally penetrate two wells, and sometimes penetrate three wells.

[0058] like Figure 2 This is the case when the angle between the fault and the horizontal well is large. At this time, the fault passes through the same fracturing section of the two horizontal wells. If the two-well sequential fracturing method or alternating fracturing sequence is used, after the fracturing of sections 1-4 of well 1# is completed, the fault will slip, causing casing deformation in sections 2-4 of well 2#, affecting the lowering of the fracturing string and causing the loss of sections. At the same time, due to frequent lifting and lowering of the string, the fracturing time will be increased. Similarly, Figure 3 When sequential fracturing, synchronous fracturing and zipper fracturing are used, the phenomenon of lost stages will occur. Figure 2 In this case, if sequential fracturing or zipper fracturing is used, no matter which section is fractured first, 1-4 or 2-4, it will cause a lost section, and if the 1# well is fractured first, the 1 to 4 sections of the 2# well will be affected by the fault slip and cause a lost section. At this time, when the 1# well is fractured to complete the 1 to 3 sections, it is necessary to first complete the fracturing of the 1 to 3 sections of the 2# well, and then, fractur the 1-4 and 2-4 sections at the same time. In this way, the problem of lost sections in the 2# well 2-4 sections is avoided.

[0059] Similarly, in Figure 3 In the case of a large fault dip that affects different fracturing sections of two wells, it is necessary to perform fracturing on sections 1-3 and 2-4 simultaneously, instead of using the common sequential fracturing, synchronous fracturing or zipper fracturing methods.

[0060] In this method, it is necessary to uniformly plan the fracturing sequence of different well sections of wells that are simultaneously crossed by faults before fracturing, so as to ensure that the fracturing sections crossed by faults are fractured at the same time. The fracturing sequence of multiple wells that are crossed by faults on the same platform and the same side is planned in a coordinated manner, so as to avoid the phenomenon of lost sections in adjacent wells caused by activating faults during fracturing. The fracturing sequence optimization method shown in the invention can effectively reduce the loss of fracturing sections caused by fault slip in shale gas horizontal wells, and effectively ensure the smooth progress of multi-stage fracturing construction in shale gas horizontal wells. The invention effectively saves the time of frequent tubing lifting and lowering due to casing deformation caused by fault slip, and increases the number of fracturing sections, thereby improving the single well production and transformation degree of shale gas horizontal wells. The fracturing sequence optimization method provided by the present invention has strong operability, and can reduce the phenomenon of lost sections caused by fault slip without the need to lower special tools or reduce the parameters during fracturing, improve construction efficiency, and increase the production of single wells, which has a strong guiding significance for on-site construction.

[0061] In the first embodiment, when the through-fracture sections of each horizontal well are located at the same position, the leading fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the trailing fracturing section is fractured individually.

[0062] The specific fracturing process is: first, each fracturing section in the preceding fracturing section of each horizontal well is fractured in sequence. After the fracturing of the preceding fracturing sections of all horizontal wells is completed, the through-fracturing sections of each horizontal well are then synchronously fractured. After the synchronous fracturing of the through-fracturing sections is completed, finally, each fracturing section in the subsequent fracturing section of each horizontal well is sequentially fractured in the direction of the wellbore of the horizontal well, thereby completing the fracturing of multiple horizontal wells at this fault.

[0063] For Figure 2 For the embodiment shown, the fault simultaneously penetrates the 1-4 fracturing section of the 1# well and the 2-4 fracturing section of the 2# well. Since the 1-4 fracturing section and the 2-4 fracturing section are located at the same section, it can be known that the penetrating fracturing sections of the two horizontal wells penetrated by the fault are located at the same section.

[0064] When fracturing is performed, the preceding fracturing section is firstly fractured, and each fracturing section in the preceding fracturing section of well 1# is firstly fractured in sequence, in the order of 1-1 section, 1-2 section, and 1-3 section; then each fracturing section in the preceding fracturing section of well 2# is fractured in sequence, in the order of 2-1 section, 2-2 section, and 2-3 section; in the process of separate fracturing, fracturing can also be started from section 2-1 of well 2#, and this fracturing sequence is also within the protection scope of the present invention.

[0065] After the fracturing of the pre-fracturing section of well 1# and well 2# is completed, the synchronous fracturing of the through-fracturing sections is started, that is, the synchronous fracturing of sections 1-4 and 2-4 is completed;

[0066] Finally, for the individual fracturing of the subsequent fracturing sections of Well 1# and Well 2#, first, the individual fracturing sections in the subsequent fracturing section of Well 1# are fractured in sequence, in the order of 1-5 sections, 1-6 sections, and 1-7 sections; then, the individual fracturing sections in the subsequent fracturing section of Well 2# are fractured in sequence, in the order of 2-5 sections, 2-6 sections, and 2-7 sections; in the process of individual fracturing, fracturing can also be started from Section 2-5 of Well 2#, and this fracturing sequence is also within the protection scope of the present invention.

[0067] In the second embodiment, when the through-fracture sections of each horizontal well are located at the same position, the leading fracturing part of each horizontal well is subjected to zipper fracturing, the through-fracture sections of each horizontal well are subjected to synchronous fracturing, and the subsequent fracturing part is subjected to zipper fracturing in sequence.

[0068] The specific fracturing process is: first, the fracturing sections located at the same section in the preceding fracturing section of each horizontal well are alternately fractured, and when the fracturing of all the preceding fracturing sections is completed, the through-fracturing sections of each horizontal well are then synchronously fractured; when the synchronous fracturing of the through-fracturing sections is completed, finally, the fracturing sections located at the same section in the subsequent fracturing section of each horizontal well are alternately fractured in sequence, thereby completing the fracturing of multiple horizontal wells at this fault.

[0069] For Figure 2 For the embodiment shown, the fault simultaneously penetrates the 1-4 fracturing section of well 1 and the 2-4 fracturing section of well 2. Since the 1-4 fracturing section and the 2-4 fracturing section are located at the same section, it can be known that the fracturing sections of the two horizontal wells penetrated by the fault are located at the same section.

[0070] When fracturing is performed, the preceding fracturing part is firstly fractured, and the zipper fracturing of the preceding fracturing parts of the two wells is completed in the order of zipper fracturing: 1-1 section, 2-1 section, 1-2 section, 2-2 section, 1-3 section, 2-3 section; during the zipper fracturing process, fracturing can also be started from the 2-1 section of the 2# well, and this fracturing order is also within the protection scope of the present invention.

[0071] Then, synchronous fracturing throughout the fracturing sections is started, i.e., synchronous fracturing of sections 1-4 and 2-4 is completed;

[0072] Finally, the zipper fracturing of the subsequent fracturing sections of the two wells was completed in the order of zipper fracturing: 1-5 sections, 2-5 sections, 1-6 sections, 2-6 sections, 1-7 sections, and 2-7 sections.

[0073] In the third embodiment, when the through-fracture sections of each horizontal well are located at the same position, the preceding fracturing section, the through-fracture section and the subsequent fracturing section of each horizontal well are synchronously fractured in sequence.

[0074] The specific fracturing process is: first, the fracturing sections located at the same section in the preceding fracturing section of each horizontal well are subjected to synchronous fracturing. After the fracturing of all the preceding fracturing sections is completed, the through fracturing sections of each horizontal well are then subjected to synchronous fracturing. After the synchronous fracturing of the through fracturing sections is completed, the fracturing sections located at the same section in the subsequent fracturing section of each horizontal well are finally subjected to synchronous fracturing in sequence according to the direction of the wellbore of the horizontal well, thereby completing the fracturing of multiple horizontal wells at this fault.

[0075] For Figure 2 For the embodiment shown, the fault simultaneously penetrates the 1-4 fracturing section of the 1# well and the 2-4 fracturing section of the 2# well. Since the 1-4 fracturing section and the 2-4 fracturing section are located at the same section, it can be known that the penetrating fracturing sections of the two horizontal wells penetrated by the fault are located at the same section. When fracturing, when fracturing the preceding fracturing section, the synchronous fracturing of the preceding fracturing sections of the two wells is completed in the order of: synchronous fracturing of the 1-1 section and the 2-1 section, synchronous fracturing of the 1-2 section and the 2-2 section, and synchronous fracturing of the 1-3 section and the 2-3 section; then the fracturing of the penetrating fracturing section is started, that is, the synchronous fracturing of the 1-4 section and the 2-4 section is completed; finally, the fracturing of the subsequent fracturing sections is completed in the order of: synchronous fracturing of the 1-5 section and the 2-5 section, synchronous fracturing of the 1-6 section and the 2-6 section, and synchronous fracturing of the 1-7 section and the 2-7 section.

[0076] In the fourth embodiment, when the through-fracture sections of each horizontal well are located at different sections, the leading fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the trailing fracturing section is fractured individually.

[0077] The specific fracturing process of this embodiment is: first, each fracturing section in the preceding fracturing section of each horizontal well is fractured in sequence; after the fracturing of the preceding fracturing sections of all horizontal wells is completed, the through-fracturing sections of each horizontal well are then synchronously fractured; after the synchronous fracturing of the through-fracturing sections is completed, finally, each fracturing section in the subsequent fracturing section of each horizontal well is sequentially fractured in the direction of the wellbore of the horizontal well, thereby completing the fracturing of multiple horizontal wells at this fault.

[0078] For Figure 3 For the embodiment shown, the same fault simultaneously penetrates the 1-3 fracturing section of well 1# and the 2-4 fracturing section of well 2#. Since the 1-3 fracturing section and the 2-4 fracturing section are respectively located at different sections, it can be known that the fracturing sections of the two horizontal wells penetrated by the fault are at different sections.

[0079] When Figure 3 When fracturing is performed in the embodiment, when the preceding fracturing part is firstly fractured, each fracturing section in the preceding fracturing section of well 1# is firstly fractured in sequence, in the order of: 1-1 section, 1-2 section; then each fracturing section in the preceding fracturing section of well 2# is fractured in sequence, in the order of: 2-1 section, 2-2 section, 2-3 section; in the process of separate fracturing, fracturing can also be started from section 2-1 of well 2#, and this fracturing sequence is also within the protection scope of the present invention.

[0080] After the fracturing of the pre-fracturing section of well 1# and well 2# is completed, the synchronous fracturing of the through-fracturing sections is started, i.e., the synchronous fracturing of sections 1-3 and 2-4 is completed;

[0081] Finally, for the individual fracturing of the subsequent fracturing sections of Well 1# and Well 2#, first, the individual fracturing sections in the subsequent fracturing section of Well 1# are fractured in sequence, in the order of 1-4 sections, 1-5 sections, 1-6 sections, and 1-7 sections; then, the individual fracturing sections in the subsequent fracturing section of Well 2# are fractured in sequence, in the order of 2-5 sections, 2-6 sections, and 2-7 sections; in the process of individual fracturing, fracturing can also be started from Section 2-5 of Well 2#, and this fracturing sequence is also within the protection scope of the present invention.

[0082] For Figure 4 For the embodiment shown in the figure, the same fault simultaneously runs through the 1-3 fracturing section of well 1, the 2-4 fracturing section of well 2, and the 3-5 fracturing section of well 3. Since the 1-3 fracturing section, the 2-4 fracturing section, and the 3-5 fracturing section are located at different sections, it can be known that Figure 4 The three horizontal wells that penetrate the fault in the figure have fracture sections at different locations. Figure 4 As shown, the normal fracturing sequence is generally carried out by sequential fracturing, synchronous fracturing, or zipper fracturing according to the well number. However, whether the 1-3 section, 2-4 section, or 3-5 section is fractured first, it will cause the other two sections and their preceding fracturing parts to be lost. Therefore, when fracturing these three sections, the preceding fracturing parts of these three sections should be completed. Then, the 1-3 section, 2-4 section, and 3-5 section are fractured synchronously, so that these three sections and their preceding fracturing parts are not lost.

[0083] When Figure 4 When fracturing is performed in the embodiment in the embodiment, the specific fracturing sequence is as follows:

[0084] (1) When the pre-sequence fracturing section is firstly fractured, each fracturing section in the pre-sequence fracturing section of well 1# is firstly fractured in sequence, in the order of 1-1 section, 1-2 section; then each fracturing section in the pre-sequence fracturing section of well 2# is fractured in sequence, in the order of 2-1 section, 2-2 section, 2-3 section; again each fracturing section in the pre-sequence fracturing section of well 3# is fractured in sequence, in the order of 3-1 section, 3-2 section, 3-3 section, 3-4 section. In the process of single fracturing, fracturing can also be started from section 2-1 of well 2# or section 3-1 of well 3#, and the fracturing order of the pre-sequence fracturing sections of the three wells is not limited.

[0085] (2) After the fracturing of the pre-fracturing sections of Wells 1#, 2# and 3# is completed, the synchronous fracturing of the through-fracturing sections is started, i.e., the synchronous fracturing of Sections 1-3, 2-4 and 3-5 is completed;

[0086] (3) Finally, the subsequent fracturing sections of Wells 1#, 2# and 3# are individually fractured. First, the various fracturing sections in the subsequent fracturing section of Well 1# are sequentially fractured in the order of 1-4 sections, 1-5 sections, 1-6 sections and 1-7 sections; then, the various fracturing sections in the subsequent fracturing section of Well 2# are sequentially fractured in the order of 2-5 sections, 2-6 sections and 2-7 sections; again, the various fracturing sections in the subsequent fracturing section of Well 3# are sequentially fractured in the order of 3-6 sections and 3-7 sections; in the process of individual fracturing, the fracturing can also be started from the 2-5 section of Well 2# or the 3-6 section of Well 3#, and the fracturing order of the preceding fracturing sections of the three wells is not limited.

[0087] In summary, the above Figure 2 , Figure 3 and Figure 4 In the embodiments, the number of fracturing stages in each well is not limited to the scope exemplified in the present invention. In the actual shale gas production process, the number of fracturing stages in each well can be determined according to the actual number set.

[0088] In an embodiment of the present invention, the steps of collecting information of multiple horizontal wells penetrating the same fault in the target shale layer and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section and a post-sequence fracturing section include:

[0089] Obtain image information of faults in the target shale layer through seismic monitoring technology;

[0090] Obtain image information of multiple horizontal wells located on the same platform of the target shale layer;

[0091] The penetration relationship between multiple horizontal wells and faults at the same platform is obtained based on the image information of the fault and the image information of the horizontal well.

[0092] In order to obtain the penetration relationship between multiple horizontal wells and faults at the same platform of the target shale layer, the seismic monitoring technology in the existing technology is used to obtain the image information of the fault, and the image information of the fault and the horizontal well are processed to form an ant body detection image. It can be seen from the ant body detection image that several different faults simultaneously penetrate multiple horizontal wells on the same platform, as well as the number of horizontal wells penetrated by the same fault, which provides favorable assistance for the subsequent fracturing of the fracturing section of the horizontal well.

[0093] In an embodiment of the present invention, Figure 5 As shown, a sequential optimization system for multi-stage fracturing of shale gas horizontal wells is also proposed, including:

[0094] An execution module 100 is used to perform staged fracturing on a horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore;

[0095] The acquisition module 200 receives the information of the fracturing section of the execution module 100 and is used to acquire information of multiple horizontal wells penetrating the same fault in the target shale layer, and divides the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section, and a post-sequence fracturing section;

[0096] The acquisition module 300 receives the information of the horizontal wells and the through-fracture sections collected by the acquisition module 200, and obtains the section information of the through-fracture sections of each horizontal well according to the above information;

[0097] The judgment module 400 receives the segment information acquired by the acquisition module 300 and judges whether the through-fracture segments of each horizontal well are located in the same segment according to each segment information;

[0098] The selection module 500 receives the segment information of the through-fracturing section obtained by the judgment module 400 and the acquisition module 300, and selects the corresponding fracturing method according to the judgment result to sequentially complete the fracturing of the preceding fracturing part, the through-fracturing section and the subsequent fracturing part of each horizontal well, and the through-fracturing section of each horizontal well is synchronously fractured.

[0099] In an embodiment of the present invention, the sequential optimization system for multi-stage fracturing of shale gas horizontal wells further includes:

[0100] The first sub-acquisition module is used to obtain image information of the fault layer of the target shale layer through microseismic monitoring technology;

[0101] The second sub-acquisition module is used to obtain image information of multiple horizontal wells located on the same platform of the target shale layer;

[0102] The third sub-acquisition module is used to obtain the penetration relationship between multiple horizontal wells and faults at the same platform according to the image information of the fault and the image information of the horizontal well.

[0103] In an embodiment of the present invention, an electronic device is further provided, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the following steps when executing the program:

[0104] Performing staged fracturing on the horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore;

[0105] Collecting information of multiple horizontal wells penetrating the same fault in the target shale layer, and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section, and a post-sequence fracturing section;

[0106] Obtaining the segment position information of the through-fracturing segment of each of the horizontal wells;

[0107] Determining whether the through-fracture sections of each of the horizontal wells are located at the same section;

[0108] According to the judgment result, a corresponding fracturing method is selected to sequentially complete the fracturing of the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and the through fracturing section of each horizontal well is fractured synchronously.

[0109] In one embodiment, when the through-fracture sections of each horizontal well are located at the same position, the preceding fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the subsequent fracturing section is fractured individually.

[0110] In one embodiment, when the through-fracturing sections of each horizontal well are located at the same position, the preceding fracturing section of each horizontal well is subjected to zipper fracturing, the through-fracturing section of each horizontal well is subjected to synchronous fracturing, and the subsequent fracturing section is subjected to zipper fracturing in sequence.

[0111] In one embodiment, when the through-fracture sections of each of the horizontal wells are located at the same position, the preceding fracturing section, the through-fracture section and the subsequent fracturing section of each of the horizontal wells are synchronously fractured in sequence.

[0112] In one embodiment, when the through-fracture sections of each horizontal well are located at different sections, the preceding fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the subsequent fracturing section is fractured individually.

[0113] In one embodiment, image information of the fault layer of the target shale layer is obtained by seismic monitoring technology;

[0114] Acquiring image information of multiple horizontal wells located on the same platform of the target shale layer;

[0115] The penetration relationship between the multiple horizontal wells and the faults at the same platform is obtained according to the image information of the fault and the image information of the horizontal well.

[0116] In an embodiment of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the method for sequential optimization of multi-stage fracturing of shale gas horizontal wells as described above is implemented.

[0117] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0118] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0120] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells, characterized in that: include: Performing staged fracturing on the horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore; Collecting information of multiple horizontal wells penetrating the same fault in the target shale layer, and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section, and a post-sequence fracturing section; Obtaining the segment position information of the through-fracturing segment of each of the horizontal wells; Determining whether the through-fracture sections of each of the horizontal wells are located at the same section; According to the judgment result, a corresponding fracturing method is selected to sequentially complete the fracturing of the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and the through fracturing section of each horizontal well is fractured synchronously.

2. The method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells according to claim 1, characterized in that: The step of selecting a corresponding fracturing method according to the judgment result to sequentially perform fracturing on the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and performing synchronous fracturing on the through fracturing section of each horizontal well comprises: When the through-fracture sections of the horizontal wells are located at the same position, the preceding fracturing parts of the horizontal wells are fractured individually, the through-fracture sections of the horizontal wells are fractured synchronously, and the subsequent fracturing parts are fractured individually in sequence.

3. The method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells according to claim 1, characterized in that: The step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and performing synchronous fracturing on the through fracturing section of each horizontal well also includes: When the through-fracturing sections of each horizontal well are located at the same position, the preceding fracturing section of each horizontal well is subjected to zipper fracturing, the through-fracturing section of each horizontal well is subjected to synchronous fracturing, and the subsequent fracturing section is subjected to zipper fracturing in sequence.

4. The method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells according to claim 1, characterized in that: The step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and performing synchronous fracturing on the through fracturing section of each horizontal well also includes: When the through-fracture sections of the horizontal wells are located at the same position, the preceding fracturing section, the through-fracture section and the subsequent fracturing section of the horizontal wells are synchronously fractured in sequence.

5. The method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells according to claim 1, characterized in that: The step of selecting a corresponding fracturing method according to the judgment result to sequentially fractur the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and performing synchronous fracturing on the through fracturing section of each horizontal well also includes: When the through-fracture sections of each horizontal well are located at different sections, the preceding fracturing section of each horizontal well is fractured individually, the through-fracture sections of each horizontal well are fractured synchronously, and the subsequent fracturing section is fractured individually.

6. The method for optimizing the sequence of multi-stage fracturing of shale gas horizontal wells according to any one of claims 1 to 5, characterized in that: The step of collecting information of multiple horizontal wells penetrating the same fault in the target shale layer and dividing the wellbore of the horizontal well penetrating the fault into a pre-sequence fracturing section, a penetrating fracturing section and a post-sequence fracturing section comprises: Obtain image information of faults in the target shale layer through seismic monitoring technology; Acquiring image information of multiple horizontal wells located on the same platform of the target shale layer; The penetration relationship between the multiple horizontal wells and the faults at the same platform is obtained according to the image information of the fault and the image information of the horizontal well.

7. A sequential optimization system for multi-stage fracturing of shale gas horizontal wells, characterized in that: include: An execution module (100) performs staged fracturing on a horizontal wellbore to form a plurality of fracturing sections perpendicular to the horizontal wellbore; A collection module (200) is used to collect information of multiple horizontal wells that penetrate the same fault in the target shale layer, and divide the wellbore of the horizontal well that penetrates the fault into a pre-sequence fracturing section, a penetrating fracturing section, and a post-sequence fracturing section; An acquisition module (300) is used to acquire the segment position information of the through-fracturing segment of each horizontal well; A judgment module (400) is used to judge whether the through-fracturing sections of each of the horizontal wells are located at the same section; A selection module (500) is used to select a corresponding fracturing method according to the judgment result to sequentially perform fracturing on the preceding fracturing section, the through fracturing section and the subsequent fracturing section of each horizontal well, and to perform synchronous fracturing on the through fracturing section of each horizontal well.

8. The sequential optimization system for multi-stage fracturing of shale gas horizontal wells according to claim 7, characterized in that: The sequential optimization system for multi-stage fracturing of shale gas horizontal wells also includes: The first sub-acquisition module is used to obtain image information of the fault layer of the target shale layer through seismic monitoring technology; The second sub-acquisition module is used to acquire image information of multiple horizontal wells located on the same platform of the target shale layer; The third sub-acquisition module is used to obtain the penetration relationship between the multiple horizontal wells and the fault at the same platform according to the image information of the fault and the image information of the horizontal well.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the program, the steps of the sequential optimization method for multi-stage fracturing of shale gas horizontal wells described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for sequential optimization of multi-stage fracturing of shale gas horizontal wells as claimed in any one of claims 1 to 6 is implemented.

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