CN114562245B

CN114562245B - Fine seam control temporary plugging steering fracturing method

Info

Publication number: CN114562245B
Application number: CN202210212364.0A
Authority: CN
Inventors: 张佩波; 宋博
Original assignee: Bofeng Petroleum Technology Development Liaoning Co ltd
Current assignee: Bofeng Petroleum Technology Development Liaoning Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2023-10-13
Anticipated expiration: 2042-03-04
Also published as: CN114562245A

Abstract

The invention discloses a fine seam control temporary plugging steering fracturing method. The method comprises the following steps: when the target well is subjected to temporary plugging steering fracturing, dynamic real-time monitoring of crack extension is carried out by adopting microseism monitoring in the fracturing process of each stage of each fracturing section of the target well; when the crack extension which is unfavorable for the fracturing is monitored in the certain stage of fracturing process of a certain fracturing segment, determining a temporary plugging adjustment scheme in real time, and completing subsequent fracturing after the temporary plugging adjustment is carried out on the fracturing segment according to the temporary plugging adjustment scheme; the temporary plugging adjustment scheme comprises the delivery times of temporary plugging agents, wherein the delivery times of the temporary plugging agents are determined based on the monitored crack extension characteristics which are unfavorable for crack extension of fracturing.

Description

Fine seam control temporary plugging steering fracturing method

Technical Field

The invention belongs to the technical field of fracturing yield increase, and particularly relates to a fine seam control temporary plugging steering fracturing method.

Background

In recent years, the fracturing scale is developed towards the directions of large sand amount, large liquid amount and large displacement (factory), old wells in old oil fields are repeatedly fractured, new layers are increased in yield and improved, and the development, the utilization, the economic construction and the like of compact oil gas and shale oil gas resources become the basis and the key point for supporting the strategic safety of oil gas. The idea of volumetric fracturing and fracture network fracturing is used for guiding the development direction of the fracturing process.

However, the problems that the expansion of fracturing cracks cannot meet the design expectations of the fracturing process often occur in the volumetric fracturing and the fracture network fracturing processes, and the problems are mainly caused by unbalanced expansion of the fracturing cracks, poor complexity of the fracturing cracks, large difference in layer/cluster transformation and the like, so that the volumetric fracturing and the fracture network fracturing effects cannot meet the expectations, and the fracturing transformation and the production effects are greatly influenced.

At present, a large number of temporary plugging fracturing technological measures are developed for old wells, old layers, compact oil gas and shale oil gas at home and abroad, and the temporary plugging technology implemented at present has a plurality of problems, wherein the problems of insufficient pertinence of design quantitative calculation, poor diagnosis and adjustment of construction process and insufficient analysis and evaluation after pressing are common problems.

How to better determine the dosage of the temporary plugging agent, how to diagnose according to the construction process even if the dosage of the temporary plugging agent and the injection mode of the temporary plugging agent are adjusted, thereby realizing finer control of crack extension, achieving the purposes of improving the fracturing effect and improving the implementation level of the temporary plugging steering process, and being a core problem puzzling the person skilled in the art.

Disclosure of Invention

The invention aims to provide a fine fracture control temporary plugging steering fracturing method, which can finely control the fracture extension, thereby improving the fracturing effect and improving the implementation level of the temporary plugging steering process.

In order to achieve the above purpose, the invention provides a fine seam control temporary plugging steering fracturing method, wherein the method comprises the following steps:

when the target well is subjected to temporary plugging steering fracturing, dynamic real-time monitoring of crack extension is carried out by adopting microseism monitoring in the fracturing process of each stage of each fracturing section of the target well; when the crack extension which is unfavorable for the fracturing is monitored in the certain stage of fracturing process of a certain fracturing segment, determining a temporary plugging adjustment scheme in real time, and completing subsequent fracturing after the temporary plugging adjustment is carried out on the fracturing segment according to the temporary plugging adjustment scheme;

wherein the crack propagation characteristics of the crack propagation that are detrimental to the fracturing process are exhibited: the two wings of the crack in the middle stage of the fracturing are unbalanced, the crack in the early stage or the crack in the middle stage of the fracturing is unbalanced in transverse expansion, the crack in the early stage of the fracturing is transversely overstretched, the natural crack is cracked in the fracturing process and is disadvantageously extended, the natural crack is cracked in the early stage of the fracturing, and the adjacent section of the crack is cracked in the natural crack zone, the crack in the early stage or the crack in the middle stage of the fracturing is insufficient in extension net width, the crack in the middle stage of the fracturing is concentrated in response points, or the crack in the middle stage of the fracturing is seldom dispersed in response points;

the temporary plugging adjustment scheme comprises the delivery times (namely temporary plugging times) of temporary plugging agents, wherein the delivery times of the temporary plugging agents are determined based on the monitored crack extension characteristics of crack extension which are unfavorable for fracturing;

(1) When the crack expansion characteristics show that two wings of crack expansion in the middle stage of fracturing are unbalanced, the temporary plugging agent is delivered in a concentrated mode once;

the uneven appearance of two wings of crack extension is usually caused by the heterogeneity of a reservoir, perforation factors, in-situ stress factors and the like, and the characteristics that the crack is excessively extended on one side and is not sufficiently extended on the other side are often presented, when the uneven appearance of the two wings of the crack extension is monitored through microseism in the middle fracturing stage of a fracturing section, temporary plugging adjustment is carried out in a mode of 1-time concentrated delivery of temporary plugging agent, so that the extension of one dominant side can be effectively limited, and meanwhile, the crack extension energy is distributed to a disadvantaged end;

(2) When the crack expansion characteristics show unbalanced transverse expansion of the crack in the early stage or the middle stage of the fracturing, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

the occurrence of the transverse expansion imbalance of the cracks is usually caused by the factors of the heterogeneity, the three-dimensional stress difference, the weak surface seam difference, the inter-cluster fracture pressure difference and the like of a reservoir, the characteristics of unbalanced perforation cluster fracturing or partial perforation clusters not fracturing are often presented, when the occurrence of the transverse expansion imbalance of the cracks is monitored through microseism in the early stage and the middle stage of fracturing of a fracturing section, temporary plugging adjustment is carried out by adopting a mode of multi-time staged delivery of temporary plugging agents, the expansion of the perforation clusters which are preferentially fracturing can be effectively limited, and the distribution of fracturing fluid is adjusted and balanced, other perforation clusters are effectively pressed, so that each perforation cluster is relatively balanced and expanded;

(3) When the crack expansion characteristic shows the transverse overexpansion of the crack at the initial stage of the fracturing, the temporary plugging agent is delivered in a concentrated way or in a grading way for a plurality of times (more than or equal to 2 times);

the occurrence of the transverse overexpansion of the crack is usually caused by the existence of natural cracks near the well bore or the factors of induced cracks, well cementation quality and the like, the characteristics of overexpansion along the well bore or the parallel well bore are often presented, when the transverse overexpansion of the crack is monitored through microseism in the early stage of fracturing of a fracturing section, temporary plugging adjustment is carried out in a mode of once concentrated or repeated (more than or equal to 2 times) graded delivery of temporary plugging agent, a transverse expansion dominant channel can be effectively temporarily plugged, and the crack is further enabled to extend to the depth;

(4) When the crack expansion characteristic shows that the natural crack is pressed in the fracturing process and is not beneficial to extend, the temporary plugging agent is delivered in a concentrated mode once;

the occurrence of the fracturing natural cracks is usually caused by local micro-faults or crack development, and when the occurrence of the fracturing natural cracks and unfavorable extension are monitored through micro-earthquakes in the fracturing process of a fracturing section, temporary plugging adjustment is carried out by adopting a mode of 1-time centralized delivery of temporary plugging agents;

(5) When the crack expansion characteristics show that the natural cracks are cracked in the initial stage of fracturing and the adjacent section of cracks are already cracked in the natural crack zone, the temporary plugging agent is delivered in a concentrated mode once or in a grading mode for a plurality of times (more than or equal to 2 times);

The occurrence of the natural fracture which is pressed open and the adjacent segment fracture is also pressed open is usually caused by fracture extension communication, and when the occurrence of the natural fracture which is pressed open and the adjacent segment fracture is pressed open by microseism in the early fracturing stage of the fracturing segment, temporary plugging adjustment is carried out by adopting a mode of once concentrated or repeated (more than or equal to 2 times) graded delivery of temporary plugging agent;

(6) When the crack extension characteristics show that the crack extension network width is insufficient in the early stage or the middle stage of the fracturing, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

the occurrence of insufficient extension network width of the fracture is usually caused by factors such as poor brittleness of a reservoir, non-development of weak surface seams and the like, the characteristics of single fracture morphology are often presented, when the occurrence of insufficient extension network width of the fracture is monitored through microseism in the early stage and the middle stage of fracturing of a fracturing section, temporary plugging adjustment is carried out by adopting a mode of multi-time graded delivery of temporary plugging agents, temporary plugging steering in the fracture can be realized, branch cracks are generated, and transverse control is enhanced;

(7) When the crack expansion characteristics show that the crack response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

the occurrence of the concentration of the fracture response points is usually caused by factors such as limited extension and expansion, insufficient net pressure and incapability of maintaining the further effective extension of the fracture, and when the occurrence of the concentration of the fracture response points is monitored through microseism in the middle fracturing stage of the fracturing stage, temporary plugging adjustment is carried out by adopting a mode of multi-time graded delivery of temporary plugging agents, so that the net pressure in the fracture can be effectively promoted and adjusted, and the extension of the fracture of a far well is promoted;

(8) When the crack expansion characteristics show rare dispersion of crack response points in the middle stage of fracturing, the temporary plugging agent is delivered in a concentrated way or in a grading way for more than or equal to 2 times;

the sparse dispersion of the fracture response points causes the insufficient complexity of the fracture, when the sparse dispersion of the fracture response points is monitored through microseism in the fracturing stage, temporary plugging adjustment is carried out by adopting a mode of centralized delivery once or graded delivery of temporary plugging agents for more than or equal to 2 times, so that the advantageous fracture channel in the fracture can be effectively plugged, and the blank area can be opened.

In the fine-slit-control temporary plugging steering fracturing method, each fracturing section of the target well refers to a fracturing section divided by adopting a staged fracturing transformation process in the temporary plugging steering fracturing process of the target well, and the fracturing section is usually determined by setting a staged packer in the fracturing process; the number of fracturing times carried out during fracturing of each fracturing segment is the fracturing series of the fracturing segment, each fracturing carried out by one fracturing segment is the fracturing of each stage of the fracturing segment, and temporary plugging construction is usually carried out between two stages of fracturing of one fracturing segment.

In the fine crack control temporary plugging steering fracturing method, in the process of monitoring crack extension dynamics in real time by microseism monitoring, whether the crack extension dynamics shows uneven crack lateral extension, whether the crack lateral overextension is shown, whether the natural crack is pressed and the extension is unfavorable, whether the natural crack is pressed and the adjacent section crack is pressed, and whether the crack extension net width is insufficient are monitored at the initial stage of fracturing; monitoring whether the crack expansion dynamics in the middle stage of fracturing shows imbalance of two wings of crack expansion, shows imbalance of crack transverse expansion, shows natural crack fracture and unfavorable extension, shows insufficient crack extension network width, shows concentrated crack response points, and shows rare dispersion of crack response points in the middle stage of fracturing; the fracture propagation dynamics are monitored at the later stages of fracturing to see if the fracture propagates open the natural fracture and does not extend as well.

In the fine fracture control temporary plugging diversion fracturing method, the early stage of fracturing refers to the stage from the beginning of fracturing to the stage of fracturing until the fracturing injection liquid reaches the total fracturing design liquid amount (sum of the design amount of the pre-fluid and the design amount of the sand-carrying fluid) of the stage of fracturing, the middle stage of fracturing refers to the stage from the fact that the fracturing injection liquid amount exceeds the total fracturing design liquid amount (sum of the design amount of the pre-fluid and the design amount of the sand-carrying fluid) of the stage of fracturing by 1/3 to the stage of fracturing total design liquid amount (sum of the design amount of the pre-fluid and the design amount of the sand-carrying fluid) of the stage of fracturing to the stage of fracturing by 3/2, and the later stage of fracturing refers to the stage from the stage of fracturing injection exceeds the total fracturing design liquid amount (sum of the design amount of the pre-fluid and the design amount of the sand-carrying fluid) of the stage of fracturing by 2/3 to the stage of fracturing total fracturing design liquid amount (sum of the design amount of the pre-fluid and the design amount of the sand-carrying fluid) of the stage of fracturing in the stage of fracturing.

In the fine-seam-control temporary plugging steering fracturing method, unbalance of two wings of the crack extension is judged according to a conventional mode in the field, and the unbalance of the two wings of the crack extension is judged usually by the fact that the extension length difference of the two wings is more than 20%; judging the transverse expansion imbalance of the crack according to a conventional mode in the field, wherein the transverse coverage area of a crack monitoring event point is generally smaller than 60% of the fracturing layer section to judge the transverse expansion imbalance of the crack; judging the transverse overextension of the fracture according to a conventional mode in the field, wherein the transverse coverage of a fracture event point along a shaft is more than 20% of the length of the section; the crack transversely excessively expands; the natural cracks are pressed and the unfavorable extension is judged according to the conventional mode in the field, usually the crack event points are mainly concentrated on the pressed natural cracks, and the transformation area event points are less, so that the pressed natural cracks are judged to be unfavorable to extend; judging that the crack extension network width is insufficient according to a conventional mode in the field, wherein the coverage area of a crack event point is generally smaller than 60% of the length of a fracturing section, and judging that the crack extension network width is insufficient; judging the crack response point set according to a conventional mode in the field, wherein the crack event point set is generally distributed in a 50% area of the designed crack length to judge the crack response point set; the sparse distribution of the fracture response points is judged according to a conventional mode in the field, and the sparse distribution of the fracture response points is judged by generally setting the number of fracture event points to be less than 50% of the number of synchronous fracture event points of adjacent fracture sections.

In the fine fracture control temporary plugging diversion fracturing method, when fracture extension which is unfavorable for fracturing is monitored, meanwhile, two unbalanced wings of fracture expansion in the middle stage of fracturing occur, the fracture is unbalanced in the initial stage or the middle stage of fracturing is laterally expanded, the fracture is laterally overstretched in the initial stage of fracturing, natural fractures are compressed in the fracturing process and are unfavorable to extend, the natural fractures are compressed in the initial stage of fracturing, and two or more than two characteristics of a natural fracture band, insufficient net width of fracture initial stage or middle stage of fracture extension, concentrated fracture middle stage fracture response points and rare dispersion of fracture middle stage fracture response points are generated, and the most important characteristics are fracture extension characteristics which are unfavorable for fracture extension; and determining the delivery times of the temporary plugging agent in the temporary plugging adjustment scheme based on the most main characteristics.

In the fine fracture control temporary plugging steering fracturing method, preferably, when the fracture expansion characteristic shows unbalanced transverse expansion of the fracture in the early or middle stage of fracturing, the temporary plugging agent is delivered in stages for 3-4 times.

In the fine fracture control temporary plugging steering fracturing method, preferably, when the fracture expansion characteristic shows the transverse overexpansion of the fracture at the initial stage of fracturing, the temporary plugging agent is delivered for 1-2 times.

In the fine fracture control temporary plugging diversion fracturing method, preferably, when the fracture expansion feature shows that the natural fracture is fractured in the initial stage of fracturing and the adjacent segment of fracture has fractured the natural fracture zone, the temporary plugging agent is delivered for 1-2 times.

In the fine fracture control temporary plugging steering fracturing method, preferably, when the fracture expansion characteristic shows insufficient fracture expansion network width in the early or middle stage of fracturing, the temporary plugging agent is delivered in 2-4 stages.

In the fine fracture control temporary plugging steering fracturing method, preferably, when the fracture expansion characteristics show that the fracture response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in stages for 2-3 times.

In the fine fracture control temporary plugging steering fracturing method, preferably, when fracture expansion characteristics show rare dispersion of fracture response points in the middle of fracturing, the temporary plugging agent is delivered in 1-2 stages.

In the fine seam control temporary plugging steering fracturing method, preferably, the method further comprises the steps of:

when the target well is subjected to temporary plugging steering fracturing, carrying out fracturing construction dynamic data monitoring in the fracturing process of each stage of each fracturing section of the target well; real-time fitting is carried out by combining the fracturing construction dynamic data and the microseism monitoring data, so that inversion of the fracture morphology is realized;

More preferably, when determining the temporary plugging adjustment scheme, determining the design dosage of the temporary plugging agent for each delivery according to the fracture morphology obtained by inversion; in the preferred technical scheme, fitting and microseism monitoring means are combined, and the on-site real-time adjustment is stronger in pertinence;

more preferably, in the process of carrying out real-time fitting by combining the fracturing construction dynamic data and the microseismic monitoring data to realize inversion of the fracture morphology,

the method not only describes the crack shape, pressure distribution, fluid distribution and stress distribution in the model, but also automatically updates the variation of solid deformation and the variation of physical parameters of the model space based on the evolution of the crack shape, and automatically divides the numerical simulation grid.

In the fine seam control temporary plugging steering fracturing method, preferably, the temporary plugging adjustment scheme comprises the design usage amount of each delivery of the temporary plugging agent, and the design usage amount of each delivery of the temporary plugging agent is determined based on the following formula:

when the target temporary plugging crack is a horizontal crack,

M _D ＝K·π·W _f ·[(R+Δd) ² -R ² ]·ρ _D

M _D the design dosage of each delivery of the temporary plugging agent is kg; k is a radial expansion coefficient, and the unit is dimensionless; w (W) _f The seam width of the temporary plugging seam is the unit m; Δd is the target thickness of the temporary plugging agent filter cake in m; ρ _D To temporarily block the density of the filter cake, the unit kg/m ³ The method comprises the steps of carrying out a first treatment on the surface of the R is the radial expansion radius of the target steering position (namely the distance between the target temporary plugging position and the central axis of the shaft), and the unit is m;

when the target temporarily plugs the vertical joint of the crack,

M _D ＝π·H·(d·Δd+Δd ² )·ρ _D ·α·β+π·H·(d·Δd+Δd ² )·ρ _D ·α

M _D the design dosage of each delivery of the temporary plugging agent is kg; h is the seam height of the target temporary plugging seam, and the unit is m; d is the seam width of the target temporary plugging seam, and the unit is m; Δd is the target thickness of the temporary plugging agent filter cake in m; ρ _D To temporarily block the density of the filter cake, the unit kg/m ³ The method comprises the steps of carrying out a first treatment on the surface of the Beta is a permeability variation coefficient, and the unit is dimensionless; alpha is a crack factor, and the unit is dimensionless.

making a temporary plugging diversion fracturing scheme before temporary plugging diversion fracturing of the target well, and guiding the target well to perform temporary plugging diversion fracturing;

wherein, the formulation of the target well temporary plugging and turning fracturing scheme comprises the following steps:

performing geological modeling and fracturing modeling on the target well;

numerical simulation is carried out on crack initiation extension and perforation cluster expansion on the basis of geological modeling and fracturing modeling;

carrying out a physical model experiment to determine the type of the temporary plugging agent;

combining a numerical simulation result and a physical model experiment result, and formulating a temporary plugging steering fracturing scheme for guiding a target well to perform temporary plugging steering fracturing;

In one embodiment, formulating a target well temporary plugging diverting fracturing scheme includes:

collecting geological data, single well ground stress data and rock mechanics data of a target well, and carrying out geological modeling and fracturing modeling on the target well based on the collected data;

based on modeling, carrying out numerical simulation on crack initiation extension and perforation cluster expansion under different temporary plugging conditions;

carrying out a physical model experiment based on the reservoir temperature, pressure and formation fluid characteristics of the target well, and carrying out indoor evaluation and optimization on the temporary plugging agent so as to determine the type of the temporary plugging agent;

based on the numerical simulation result and the object model experimental result, a temporary plugging steering fracturing scheme is formulated and used for guiding a target well to perform temporary plugging steering fracturing;

the geological modeling and the fracturing modeling are performed in a conventional mode in the field, the physical model experiment is performed in a conventional mode in the field, and the temporary plugging diversion fracturing scheme is designated to be performed in a conventional mode in the field;

in the preferred technical scheme, the formulated temporary plugging and steering fracturing scheme of the target well generally comprises a plurality of fracturing sections of the target well, each fracturing section is subjected to a plurality of stages of fracturing respectively, each fracturing section is subjected to fracturing construction parameters (comprising the types of fracturing fluids, the use amounts of the fracturing fluids, the fracturing fluid pumping parameters and the like) of each stage of fracturing, temporary plugging agent injection construction parameters (comprising the types of temporary plugging agents, the use amounts of the temporary plugging agents, the temporary plugging agent pumping parameters and the like) among all stages of fracturing and the like.

In the fine seam control temporary plugging steering fracturing method, preferably, each time the temporary plugging agent is delivered, the temporary plugging agent is delivered according to the designed dosage, and then the following steps are further carried out:

when the temporary plugging agent is required to be injected and is turned on a plane, judging whether the pressure difference formed after the temporary plugging agent is larger than the difference value between the maximum principal stress and the minimum principal stress of the stratum and the difference value between the fracture pressure of the block and the opening pressure of the previous seam or not, if the pressure difference formed after the temporary plugging agent is larger than the difference value between the maximum principal stress and the minimum principal stress of the stratum and the difference value between the fracture pressure of the block and the opening pressure of the previous seam, completing the injection of the temporary plugging agent, otherwise, further injecting the temporary plugging agent until the pressure difference formed after the temporary plugging agent is larger than the difference value between the maximum principal stress and the minimum principal stress of the stratum and the difference value between the fracture pressure of the block and the opening pressure of the previous seam is satisfied;

when the temporary plugging agent is required to be longitudinally turned after being injected, judging whether the pressure difference formed after the temporary plugging agent is larger than the minimum main stress on the section and the difference value between the rupture pressure of the block and the opening pressure of the previous slit or not, if the pressure difference formed after the temporary plugging agent is larger than the minimum main stress on the section and the difference value between the rupture pressure of the block and the opening pressure of the previous slit, the temporary plugging agent delivery is finished, otherwise, the temporary plugging agent is required to be further injected until the pressure difference formed after the temporary plugging agent is met and is larger than the minimum main stress on the section and the difference value between the rupture pressure of the block and the opening pressure of the previous slit.

after each stage of fracturing of each fracturing section of the target well is completed, respectively performing post-fracturing analysis, summarizing the relevance and regularity of temporary plugging parameters and implementation effects,

in the preferred embodiment, the post-press analysis may be performed in a manner conventional in the art, for example, using a comprehensive approach of fracture construction data analysis and test data analysis, including fracture construction data dynamic fitting, pump down pressure drop test analysis, long term production data flow field evolution analysis.

after temporary plugging, steering and fracturing of the target well are completed, carrying out productivity fitting;

in the preferred embodiment, capacity fitting can be performed in a conventional manner in the art, for example, a comprehensive method of a fracturing well test dynamic interpretation method and a numerical simulation dynamic fitting is adopted, a key model parameter numerical range of a fracturing well is qualitatively determined by the fracturing well test dynamic interpretation method, an upper limit and a lower limit of a model parameter are determined according to flow field evolution to serve as parameter value ranges of a quantitative capacity fitting model, and then parameter inversion is performed in the parameter ranges by using a constraint optimization method through the numerical simulation dynamic fitting method and future yield is predicted.

In the fine seam control temporary plugging steering fracturing method, the temporary plugging agent is selected from temporary plugging agents commonly used in the field, and preferably, the temporary plugging agent satisfies at least one of the following conditions:

(1) Comprises a plurality of temporary plugging materials;

(2) High temperature resistance;

(3) The pressure bearing performance is good;

(4) The degradation time is controllable;

(5) No damage to the reservoir;

meeting the conditions is more beneficial to reservoir fracturing modification application of the high-temperature deep well.

The inventor optimizes the temporary plugging steering fracturing process, and realizes finer control of crack extension by adding a temporary plugging adjustment scheme according to microseism monitoring in the temporary plugging steering fracturing process, thereby achieving the aims of improving fracturing effect and improving implementation level of the temporary plugging steering process. The fine seam control temporary plugging steering fracturing method provided by the invention is suitable for old well fracturing, contributes to the development of residual oil gas of the old well, has excellent fracturing effect, and aims at maximizing the fracturing transformation volume and maximizing the complexity of the fracture, and the transformation volume realized by the fine seam control temporary plugging steering fracturing method is more than 1.5 times of that of conventional fracturing.

Drawings

FIG. 1 is a schematic diagram of a temporary plugging fracturing in a multistage joint.

Fig. 2A is a schematic diagram of a high water content old well repeated fracturing.

Fig. 2B is a schematic diagram of a medium and high water-bearing well repeat fracturing.

Fig. 3 is a schematic flow chart of the fine fracture control temporary plugging diverting fracturing method provided in embodiment 1.

Fig. 4 is a layout of the in-situ fracturing apparatus in example 1.

Fig. 5A is a graph comparing the effects of example 1 before and after temporary plugging adjustment construction, in which natural cracks are pressed during fracturing and unfavorable extension occurs.

Fig. 5B is a graph comparing the effects before and after temporary plugging adjustment construction when imbalance occurs in the two wings of fracture expansion in the middle stage of fracturing in example 1.

Fig. 5C is a graph comparing the effects before and after temporary plugging adjustment construction, in example 1, in which the mid-fracture response points appear in a concentrated manner.

Fig. 5D is a graph showing the comparison of the effects before and after temporary plugging adjustment construction, in example 1, when the initial fracture lateral overexpansion occurs.

Fig. 6A is a three-dimensional porosity model diagram in example 1.

FIG. 6B is a three-dimensional permeability model graph of example 1.

Fig. 6C is a three-dimensional saturation model diagram in example 1.

FIG. 6D is a graph of the natural fracture model in example 1.

Fig. 6E is a graph of an artificial crack model in example 1.

Fig. 6F is a three-dimensional sand body model diagram in the north-south direction in example 1.

FIG. 6G is a diagram of a three-dimensional sand body model in the east-west direction of example 1.

FIG. 7 is a plot of throughput fit results.

Detailed Description

In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.

The temporary plugging and turning fracturing stages are usually implemented by temporary plugging fracturing or repeated fracturing in a multi-stage joint, a main fracture, a branch fracture, a secondary branch fracture and the like can be formed according to the temporary plugging and fracturing principle in the multi-stage joint as shown in fig. 1, repeated fracturing cracks, old fractures, turning fractures, secondary fractures and the like can be formed according to the repeated fracturing principle as shown in fig. 2A and fig. 2B, and the fracturing effect often cannot reach the expected phenomenon due to the complexity of temporary plugging and turning fracturing, so that the fracturing transformation and the production effect are greatly influenced.

In order to achieve fine fracture control in a temporary plugging steering fracturing process and achieve the purposes of improving fracturing effect and improving implementation level of temporary plugging steering technology, one embodiment of the invention provides a fine fracture control temporary plugging steering fracturing method, which comprises the following steps:

the temporary plugging adjustment scheme comprises the delivery times (namely temporary plugging times) of temporary plugging agents, wherein the delivery times of the temporary plugging agents are determined based on the monitored crack extension characteristics of the crack extension which are unfavorable for fracturing:

Further, when the crack extension characteristics show uneven crack lateral extension in the early or middle stage of fracturing, the temporary plugging agent is delivered in stages for 3-4 times.

Further, when the fracture propagation characteristics exhibit lateral overpropagation of the fracture at the initial stage of fracturing, the temporary plugging agent is delivered 1-2 times.

Further, when the fracture propagation characteristics are indicative of fracturing the natural fracture at an initial stage of fracturing and the adjacent segment of the fracture has fractured the natural fracture zone, the temporary plugging agent is delivered 1-2 times.

Further, when the crack extension characteristics show insufficient crack extension network width in the early or middle stage of the fracturing, the temporary plugging agent is delivered in 2-4 stages.

Further, when the crack extension feature shows that the crack response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in stages for 2-3 times.

Further, when the crack propagation characteristics show rare dispersion of the crack response points in the middle of the fracturing, the temporary plugging agent is delivered in stages for 1-2 times.

Further, the method further comprises:

Further, when determining the temporary plugging adjustment scheme, determining the design dosage of the temporary plugging agent for each delivery according to the fracture morphology obtained by inversion; in the preferred technical scheme, fitting and microseism monitoring means are combined, and the on-site real-time adjustment is stronger in pertinence;

furthermore, in the process of carrying out real-time fitting by combining the fracturing construction dynamic data and the microseism monitoring data to realize inversion of the fracture morphology,

Further, the temporary plugging adjustment scheme comprises the design amount of each delivery of the temporary plugging agent, and the design amount of each delivery of the temporary plugging agent is determined based on the following formula:

when the target temporary plugging crack is a horizontal crack,

M _D ＝K·π·W _f ·[(R+Δd) ² -R ² ]·ρ _D

when the target temporary plugging crack is a vertical crack,

Further, the method further comprises:

performing geological modeling and fracturing modeling on the target well;

Still further, formulating the target well temporary plugging diverting fracturing scheme includes:

Further, each time the temporary plugging agent is delivered, the temporary plugging agent is delivered according to the designed dosage, and then the following steps are further carried out:

Further, the method further comprises:

Further, the temporary plugging agent used satisfies at least one of the following conditions:

(1) Comprises a plurality of temporary plugging materials;

(2) High temperature resistance;

(3) The pressure bearing performance is good;

(4) The degradation time is controllable;

(5) No damage to the reservoir.

Further, the fracturing construction steps are described by taking a certain section of fracturing of the target well as an example:

(1) The perforation bridge plug combination of the fracturing section is completed according to the design;

(2) Casting a soluble plugging ball on the ground, and plugging the fractured sections when the ball is placed on a bridge plug;

(3) Performing first-stage sand fracturing construction;

(4) The temporary plugging agent is put into a special plugging device, after plugging is finished, the temporary plugging agent is pumped in a constant discharge capacity, after the temporary plugging agent is put in place, the pressure response is observed, and after the pressure response meets the requirement, the delivery of the temporary plugging agent is finished;

(5) Carrying out sand adding construction of the next stage;

(6) Repeating the steps (4) - (5) until the modification is finished;

the method comprises the steps of carrying out dynamic real-time monitoring of crack extension and dynamic data monitoring of fracturing construction by adopting microseism monitoring in the fracturing process, and carrying out real-time fitting by combining the monitored dynamic data of fracturing construction and microseism monitoring data to realize inversion of crack morphology in the temporary plugging steering fracturing process; when the crack extension which is unfavorable for the fracturing is monitored in the fracturing process of a certain level, analyzing the fracturing construction in real time, determining a temporary plugging adjustment scheme, carrying out temporary plugging adjustment construction on the fracturing section according to the temporary plugging adjustment scheme, and then carrying out subsequent temporary plugging turning fracturing construction;

Further, when the target well is a casing string, the fine-control temporary plugging steering fracturing construction of the target well comprises:

(1) The method comprises the steps of (1) injecting and opening a temporary plugging fracturing section perforation cluster at one time;

(2) Performing first-stage sand fracturing construction;

(3) The temporary plugging agent is put into a special plugging device, after plugging is finished, the temporary plugging agent is pumped in a constant discharge capacity, after the temporary plugging agent is put in place, the pressure response is observed, and after the pressure response meets the requirement, the delivery of the temporary plugging agent is finished;

(4) Carrying out sand adding construction of the next stage;

(5) Repeating the steps (3) - (4) until the modification is finished;

the method comprises the steps of carrying out dynamic real-time monitoring of crack extension and dynamic data monitoring of fracturing construction by adopting microseism monitoring in the fracturing process, and carrying out real-time fitting by combining the monitored dynamic data of fracturing construction and microseism monitoring data to realize inversion of crack morphology in the temporary plugging steering fracturing process; when crack extension which is unfavorable for fracturing is monitored in a certain stage of fracturing process, determining a temporary plugging adjustment scheme in real time, and carrying out subsequent temporary plugging steering fracturing construction after carrying out temporary plugging adjustment construction on the fracturing section according to the temporary plugging adjustment scheme.

Example 1

The embodiment provides a fine seam control temporary plugging steering fracturing method, which comprises the following steps of:

Step 1: collecting data of a target well;

and collecting geological data, single well ground stress data and rock mechanics data of the target well, and collecting adjacent well fracturing construction parameters and microseism detection data.

Step 2: geological modeling and fracturing modeling;

and (3) carrying out geological modeling and fracturing modeling on the target well based on the data collected in the step (1).

Step 3: based on modeling, carrying out numerical simulation on crack initiation extension and perforation cluster expansion under different temporary plugging conditions;

and determining proper temporary plugging conditions including the dosage of temporary plugging agent by carrying out numerical simulation on crack initiation extension and perforation cluster expansion under different temporary plugging conditions.

Step 4: and carrying out a physical model experiment based on the reservoir temperature, the pressure and the formation fluid characteristics of the target well, and carrying out indoor evaluation and optimization on the temporary plugging agent so as to determine the type of the temporary plugging agent.

Step 5: based on the numerical simulation result and the object model experiment result, a temporary plugging and steering fracturing scheme of the target well is formulated;

step 6: performing temporary plugging diverting fracturing construction of the target well according to a temporary plugging diverting fracturing scheme, performing dynamic real-time monitoring of crack extension and dynamic data monitoring of fracturing construction by adopting microseism monitoring in the construction process, and performing real-time fitting by combining the monitored dynamic data of fracturing construction and microseism monitoring data to realize inversion of crack morphology in the temporary plugging diverting fracturing process; in the temporary plugging diversion fracturing construction process, when the crack extension which is unfavorable for fracturing is monitored in a certain stage of fracturing process of a certain fracturing section, determining a temporary plugging adjustment scheme in real time, and carrying out subsequent temporary plugging diversion fracturing construction after carrying out temporary plugging adjustment construction on the fracturing section according to the temporary plugging adjustment scheme;

Among them, the crack propagation characteristics of crack propagation unfavorable for the progress of fracturing are presented: the two wings of the crack in the middle stage of the fracturing are unbalanced, the crack in the early stage or the crack in the middle stage of the fracturing is unbalanced in transverse expansion, the crack in the early stage of the fracturing is transversely overstretched, the natural crack is cracked in the fracturing process and is disadvantageously extended, the natural crack is cracked in the early stage of the fracturing, and the adjacent section of the crack is cracked in the natural crack zone, the crack in the early stage or the crack in the middle stage of the fracturing is insufficient in extension net width, the crack in the middle stage of the fracturing is concentrated in response points, or the crack in the middle stage of the fracturing is seldom dispersed in response points;

the temporary plugging adjustment scheme comprises the delivery times of temporary plugging agents and the design dosage of the temporary plugging agents delivered each time;

the number of temporary plugging agent deliveries is determined based on the monitored crack propagation characteristics that are detrimental to the fracture propagation:

when the crack expansion characteristics show that two wings of crack expansion in the middle stage of fracturing are unbalanced, the temporary plugging agent is delivered in a concentrated mode once;

when the crack expansion characteristics show unbalanced transverse expansion of the crack in the early stage or the middle stage of the fracturing, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

when the crack expansion characteristic shows the transverse overexpansion of the crack at the initial stage of the fracturing, the temporary plugging agent is delivered in a concentrated way or in a grading way for a plurality of times (more than or equal to 2 times);

When the crack expansion characteristic shows that the natural crack is pressed in the fracturing process and is not beneficial to extend, the temporary plugging agent is delivered in a concentrated mode once;

when the crack expansion characteristics show that the natural cracks are cracked in the initial stage of fracturing and the adjacent section of cracks are already cracked in the natural crack zone, the temporary plugging agent is delivered in a concentrated mode once or in a grading mode for a plurality of times (more than or equal to 2 times);

when the crack extension characteristics show that the crack extension network width is insufficient in the early stage or the middle stage of the fracturing, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

when the crack expansion characteristics show that the crack response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in a grading way for a plurality of times (more than or equal to 2 times);

when the crack expansion characteristics show rare dispersion of crack response points in the middle stage of fracturing, the temporary plugging agent is delivered in a concentrated way or in a grading way for more than or equal to 2 times;

the design amount of temporary plugging agent per delivery is determined based on the following formula:

when the target temporary plugging crack is a horizontal crack,

M _D ＝K·π·W _f ·[(R+Δd) ² -R ² ]·ρ _D

when the target temporary plugging crack is a vertical crack,

M _D the design dosage of each delivery of the temporary plugging agent is kg; h is the seam height of the target temporary plugging seam, and the unit is m; d is the seam width of the target temporary plugging seam, and the unit is m; Δd is the target thickness of the temporary plugging agent filter cake in m; ρ _D To temporarily block the density of the filter cake, the unit kg/m ³ The method comprises the steps of carrying out a first treatment on the surface of the Beta is a permeability variation coefficient, and the unit is dimensionless; alpha is a crack factor, and the unit is dimensionless;

in the temporary plugging turning fracturing construction process and the temporary plugging adjustment construction process, when the temporary plugging agent is delivered each time, the temporary plugging agent is delivered according to the design dosage, and then the following steps are further carried out:

Specifically, in this embodiment, the method for performing temporary plugging and turning fracturing of the target well includes:

A. preparation before construction:

the oil testing and production testing teams are responsible for fracturing a wellhead and preparing pipe column connection:

(1) Arranging roads and well sites to meet construction requirements;

(2) Tripping the tubular column; the well mouth is provided with a well control device to prevent down-hole objects and blowout, and the boiler vehicle is used for thoroughly flushing the oil pipe before the pipe column is put down;

(3) Installing a fracturing manifold by matching with a fracturing team; the fracturing manifold adopts 8 branch manifolds, so that the requirement of large-displacement construction is met;

(4) A liquid receiving platform and a sewage oil and sewage recovery (reinjection) device;

(5) Assembling a christmas tree at a wellhead;

(6) Preparing ground and well tools such as gates, pup joints, buckling joints and the like with the withstand voltage of 90 MPa;

(7) One cement truck and 24m clean water are prepared ³ ；

(8) Connecting a back flushing well pipeline before fracturing;

(9) In the liquid discharge production process, the returned liquid samples are collected in an encrypted mode, and two returned liquid samples with fixed time are provided for analysis every day;

the fracturing team was prepared as follows:

(1) The fracturing construction area and the liquid preparation area are paved with anti-seepage cloth to prevent various liquid and solid raw materials from falling to the ground;

(2) Determining the fracturing construction scale, the fracturing construction procedure and the liquid distribution scheme;

(3) Preparing fracturing fluid;

(4) Preparing a temporary plugging agent;

(5) Preparing a fracturing truck set; the fracturing truck set meets the design requirement of water horsepower, and pumps cannot be stopped during construction;

(6) Meter metering (pressure, sand ratio and displacement curve) preparation work is performed in fracturing construction;

(7) Measuring instantaneous pump stopping pressure before and after fracturing to prepare for working;

(8) Preparing fracturing fluid storage tanks (comprising a slickwater storage tank, an active water storage tank and a clear water storage tank), soft tanks (used for containing temporary plugging agents) and other fluid preparing devices; the fracturing fluid storage tank, the soft tank and other fluid preparing devices need to be washed cleanly in advance;

(9) Placing a train set according to a field fracturing equipment placement chart (see fig. 4); 6 fracturing pump trucks and 8m are needed ³ The liquid preparation device comprises 3 slickwater liquid storage tanks (30-40 m ³ 2 active water tanks (30 m) ³ 1 clear water liquid storage tank (30 m) ³ 1 soft can (400 m) ³ /v).

Production operation and coordination unit:

(1) Preparing two water source wells within 5km range and 100m of liquid supply flow ³ The time is more than/h;

(2) Responsible for contacting and designating the road;

(3) Is responsible for designating the solicitation of the fracturing land;

(4) And (5) coordinating safety communication and environment protection in the 1km range of the well site and connecting the safety communication and environment protection.

B. Technical mating of construction forward constructors

(1) Each post needs to carefully check own equipment to ensure that the equipment is intact;

(2) A cleaning solution tank is needed before liquid preparation and loading;

(3) When preparing the liquid on site, various additives can be added into the crosslinking liquid according to the formula proportion;

(4) Performing a crosslinking test before pressing, and recording the crosslinking condition;

(5) Before construction, carefully checking the fracturing wellhead and the ground pipeline, and checking and recording;

(6) According to the design construction, no puncture and no leakage are ensured;

(7) When in fracturing construction, the well bore is filled with liquid with small discharge capacity;

(8) If sand blockage occurs in the sand adding process, immediately starting a pump truck to wash the sand until clear water is obtained;

(9) If the designed sand amount cannot be achieved due to special conditions, the sand amount must be agreed with a target well management party;

(10) Illegal operation is forbidden, safe construction is paid attention to, environment-friendly work is enhanced, and personal injury is avoided;

(11) In the fracturing construction, the leakage is strictly forbidden, and the random release of fracturing sand and fracturing fluid is strictly forbidden;

(12) When in construction, strictly forbidden personnel enter a high-voltage area;

(13) The design is closed, and the signing procedure is performed.

C. The construction steps are as follows:

(1) Connecting a ground manifold;

(2) Ground circulation, detecting thorn leakage and connection conditions and checking acceptance;

(3) Wellhead and surface pipeline pressure test (low pressure and high pressure pipelines): the pressure test of the ground pipeline and the gate is 70MPa, the pressure test is stable for 10min, no thorns and no leaks are qualified, clear water is adopted for the pressure test, and the pollution of the ground caused by the thorns and the leaks of the pipeline is avoided;

(4) Preparing fracturing construction of a well irrigation shaft;

(5) Small-sized fracturing test;

(6) Carrying out fracturing construction according to the design;

the fracturing construction steps are described by taking a certain section of fracturing as an example:

(3) performing first-stage sand fracturing construction;

(5) Carrying out sand adding construction of the next stage;

(6) repeating the steps (4) - (5) until the modification is finished;

the method comprises the steps of carrying out dynamic real-time monitoring of crack extension and dynamic data monitoring of fracturing construction by adopting microseism monitoring in the fracturing process, and carrying out real-time fitting by combining the monitored dynamic data of fracturing construction and microseism monitoring data to realize inversion of crack morphology in the temporary plugging steering fracturing process; when the crack extension which is unfavorable for the fracturing is monitored in the fracturing process of a certain level, determining a temporary plugging adjustment scheme in real time (specifically referring to the description), performing temporary plugging adjustment construction on the fracturing segment according to the temporary plugging adjustment scheme, and then performing subsequent temporary plugging turning fracturing construction;

(7) After the fracturing is finished, the wellhead gate of the oil sleeve is closed timely, the well is closed for 120min, and the open-flow is controlled by a 10mm oil nozzle until the fracture is closed (the diffusion pressure time and the open-flow process are determined by field technicians);

(8) And (5) crossing the well.

In this embodiment, in the fracturing construction process, the target well is subjected to multiple temporary plugging adjustment construction, and the temporary plugging adjustment construction schemes are summarized in table 1:

TABLE 1

The effect pair before and after temporary plugging adjustment construction is shown in fig. 5A, wherein natural cracks are pressed in and disadvantageously extend in the fracturing process for a certain time;

Wherein, when imbalance of two wings of crack expansion occurs at the middle stage of fracturing at a certain time, the effect pair before and after temporary plugging adjustment construction is shown in fig. 5B;

wherein, the response points of the fracture in the middle of the fracturing appear in a centralized way for a certain time, and the effect pair before and after temporary plugging adjustment construction is shown in fig. 5C;

the effect of performing temporary plugging adjustment before and after the construction is shown in fig. 5D, for example.

Step 7: after each stage of fracturing of each fracturing section of the target well is completed, respectively performing post-fracturing analysis, and summarizing the relevance and regularity of temporary plugging parameters and implementation effects;

and performing post-fracturing analysis including dynamic fitting of the fracturing construction data, pressure drop test analysis of pump stopping and long-term production data flow field evolution analysis by adopting a comprehensive method of the fracturing construction data analysis and the test data analysis.

Step 8: after temporary plugging, steering and fracturing of the target well are completed, carrying out productivity fitting;

the method comprises the steps of determining a key model parameter numerical range of a fracturing well qualitatively by using a fracturing well test dynamic interpretation method and a numerical simulation dynamic fitting comprehensive method, determining upper and lower model parameter limits as parameter value ranges of a quantitative productivity fitting model according to flow field evolution, performing parameter inversion in the parameter ranges by using a constraint optimization method by using the numerical simulation dynamic fitting method, and predicting future yield.

In this embodiment, in the model for numerical simulation at the time of capacity fitting, the three-dimensional porosity model is shown in fig. 6A, the three-dimensional permeability model is shown in fig. 6B, the three-dimensional saturation model is shown in fig. 6C, the natural fracture model is shown in fig. 6D, the artificial fracture model is shown in fig. 6E, and the three-dimensional sand body model is shown in fig. 6F and 6G.

In this example, the capacity fitting results are shown in FIG. 7.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the scope of the present invention, and the same or similar designs as the present invention fall within the scope of the present invention.

Claims

1. A fine seam control temporary plugging steering fracturing method comprises the following steps:

wherein the crack propagation characteristics of the crack propagation that are detrimental to the fracturing process are exhibited: the two wings of the crack in the middle stage of the fracturing are unbalanced, the crack in the early stage or the crack in the middle stage of the fracturing is unbalanced in transverse expansion, the crack in the early stage of the fracturing is transversely overstretched, the natural crack is cracked in the fracturing process and is disadvantageously extended, the natural crack is cracked in the early stage of the fracturing, the adjacent section of the crack is cracked in the natural crack zone, the expansion net width of the crack in the early stage or the crack in the middle stage of the fracturing is insufficient, the response points of the crack in the middle stage of the fracturing are concentrated, or the response points of the crack in the middle stage of the fracturing are scattered rarely;

The temporary plugging adjustment scheme comprises the delivery times of temporary plugging agents, wherein the delivery times of the temporary plugging agents are determined based on the monitored crack extension characteristics of the crack extension which are unfavorable for fracturing:

when two wings of crack expansion in the middle stage of fracturing are unbalanced, the temporary plugging agent is delivered in a concentrated mode once; when the initial or middle stage of fracturing is in unbalanced transverse expansion, the temporary plugging agent is delivered in multiple stages; when the fracture is transversely excessively expanded in the initial stage of fracturing, the temporary plugging agent is delivered in a concentrated way or in a plurality of stages; when the natural cracks are pressed in the fracturing process and do not extend easily, the temporary plugging agent is delivered in a concentrated mode once; when the natural fracture is fractured at the initial stage of fracturing and the adjacent segment of fracture is fractured at the natural fracture zone, the temporary plugging agent is delivered in a concentrated mode or in a grading mode for multiple times; when the expansion network width of the crack at the early stage or the middle stage of fracturing is insufficient, the temporary plugging agent is delivered in multiple stages; when the fracture response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in multiple stages; when the fracture response points in the middle stage of fracturing are sparsely dispersed, the temporary plugging agent is delivered in a concentrated way or in a grading way for many times;

The initial stage of fracturing refers to the stage from the beginning of fracturing to the stage of fracturing injection liquid reaching 1/3 of the total design liquid amount of fracturing of the stage of fracturing, and the middle stage of fracturing refers to the stage from the stage of fracturing injection liquid exceeding 1/3 of the total design liquid amount of fracturing of the stage of fracturing to the stage of fracturing reaching 3/2 of the total design liquid amount of fracturing of the stage of fracturing;

the temporary plugging adjustment scheme comprises the design consumption of each delivery of the temporary plugging agent, and the design consumption of each delivery of the temporary plugging agent is determined based on the following formula:

when the target temporary plugging crack is a horizontal crack,

M _D ＝K·π·W _f ·[(R+Δd) ² -R ² ]·ρ _D

M _D the design dosage of each delivery of the temporary plugging agent is kg; k is a radial expansion coefficient, and the unit is dimensionless; w (W) _f The seam width of the temporary plugging seam is the unit m; Δd is the target thickness of the temporary plugging agent filter cake in m; ρ _D To temporarily block the density of the filter cake, the unit kg/m ³ The method comprises the steps of carrying out a first treatment on the surface of the R is the radial expansion of the target steering positionRadius spreading, unit m;

when the target temporary plugging crack is a vertical crack,

2. The method of claim 1, wherein the temporary plugging agent is delivered in 3-4 stages when the fracture propagation characteristics exhibit an imbalance in fracture lateral propagation at the early or mid stages of the fracture.

3. The method of claim 1, wherein the temporary plugging agent is delivered 1-2 times when the fracture propagation characteristics exhibit fracture initiation fracture lateral overpropagation.

4. The method of claim 1, wherein the temporary plugging agent is delivered 1-2 times when the fracture propagation characteristics are indicative of fracturing the natural fracture at an initial stage of fracturing and the adjacent segment of the fracture has fractured the natural fracture zone.

5. The method of claim 1, wherein the temporary plugging agent is delivered in 2-4 stages when the fracture propagation characteristics exhibit insufficient fracture propagation network width at the early or mid-fracture stage.

6. The method of claim 1, wherein,

when the crack expansion characteristics show that the crack response points in the middle stage of fracturing are concentrated, the temporary plugging agent is delivered in stages for 2-3 times;

when the crack extension characteristic shows rare dispersion of the crack response points in the middle stage of fracturing, the temporary plugging agent is delivered in stages for 1-2 times.

7. The method of claim 1, wherein the method further comprises:

when the temporary plugging adjustment scheme is determined, the design dosage of the temporary plugging agent for each delivery is determined according to the fracture morphology obtained by inversion.

8. The method of claim 1, wherein each time the temporary plugging agent is delivered, the temporary plugging agent is delivered in a designed amount, and further comprising the steps of:

9. The method of claim 1, wherein,

the method further comprises the steps of:

performing geological modeling and fracturing modeling on the target well;

The method further comprises the steps of:

after each stage of fracturing of each fracturing section of the target well is completed, respectively performing post-fracturing analysis, and summarizing the relevance and regularity of temporary plugging parameters and implementation effects;

the method further comprises the steps of:

and after the temporary plugging, steering and fracturing of the target well are completed, carrying out productivity fitting.