Volume fracturing temporary plugging process for multi-cluster horizontal wells in conglomerate oil reservoir section

Abstract

The invention provides a multi-cluster horizontal well volume fracturing temporary plugging process in a conglomerate oil reservoir section, and belongs to the technical field of petroleum and natural gas yield increase. According to the method, two times of temporary plugging are carried out in a front stage and a sand adding stage in intra-section multi-cluster temporary plugging fracturing; stepwise displacement reduction testing is carried out in the trial extrusion stage, displacement needs to be changed as quickly as possible, the displacement when the displacement is stable and hole friction resistance parameters are selected for calculation, and the number of opened holes is obtained; a temporary plugging agent is added according to the number of the opened eyelets; when the plugging agent is in place, whether temporary plugging is effective or not is judged through a pressure boosting method, and if temporary plugging is ineffective, the temporary plugging agent continues to be added; if the temporary plugging is effective, when the pressure fluctuates in a preset range, the pressure is considered to be stable, and then sand is added; and in the sand adding temporary plugging stage, the process which is the same as that in the front temporary plugging stage is adopted. According to the method, the plugging efficiency of multi-cluster temporary plugging fracturing in the section can be effectively improved, and the method has very important significance for solving the problems of difficult temporary plugging construction and poor temporary plugging effect of the conglomerate oil reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of increasing oil and natural gas production, and in particular to a volume fracturing temporary plugging process for multi-cluster horizontal wells in a conglomerate reservoir section. Background Art

[0002] With the promotion and application of horizontal well volume fracturing technology, the multi-cluster temporary plugging fracturing process in the horizontal well section has become an important means to improve the uniformity of fracturing transformation and reduce costs and improve efficiency. However, the gravel reservoir is highly heterogeneous. Due to the differences in gravel size, distribution and ground stress, the use of multi-cluster + limit flow + temporary plugging fracturing technology in the section is limited to the balanced fracturing effect. At the perforation hole, due to the sudden change in the structure of the sand-carrying fluid flowing through, its speed will increase sharply. When it passes through the perforation hole at high speed and enters the formation, it will cause severe scouring at the entrance of the hole, resulting in severe erosion at the entrance of the hole (see the downhole Hawkeye monitoring results in the attached Figure 1 ), which reduces the pressure difference between the inside and outside of the hole, making it difficult for temporary plugging materials to effectively seal the blasthole, resulting in poor effectiveness of temporary plugging, which affects the fracturing effect. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention constructs a temporary plugging process for volume fracturing of multi-cluster horizontal wells in a conglomerate reservoir. Temporary plugging is performed twice in the pre-stage and sand adding stage of the temporary plugging fracturing of multi-cluster in the segment; a step-down displacement test is performed in the test squeeze stage, and the displacement should be changed as quickly as possible between each displacement. The displacement with stable displacement and the friction parameters of the borehole are selected for calculation, and the displacement fluctuation is less than 0.05m 3 / min, the displacement is considered stable, and the number of open holes is obtained; temporary plugging agent is added according to the number of open holes; when the plugging agent is in place, that is, the pressure rises when the temporary plugging is sent at a constant displacement, and the effectiveness of temporary plugging is judged by the pressure increase method. If temporary plugging is ineffective, the temporary plugging agent is continued to be added; if temporary plugging is effective, when the pressure fluctuates within the preset range, the pressure is considered stable, and then sand is added; in the sand adding temporary plugging stage: the same process as the pre-temporary plugging stage is adopted. The present invention can effectively improve the efficiency of multi-cluster temporary plugging fracturing plugging in the segment, which is of great significance to solving the difficulties in temporary plugging construction and poor temporary plugging effect in conglomerate oil reservoirs.

[0004] The present invention provides a volume fracturing temporary plugging process for multi-cluster horizontal wells in a conglomerate reservoir section, which divides the temporary plugging stage into a pre-temporary plugging stage and a sand-adding temporary plugging stage; and comprises the following steps:

[0005] In the pre-blocking stage:

[0006] During the trial extrusion stage, a step-down displacement test is conducted. Changes must be made within a preset time between each displacement. The displacement and perforation friction parameters when the displacement is stable are selected for calculation to obtain the number of open perforations.

[0007] Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement;

[0008] When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, it is considered that the pressure is stable, and then sand is added;

[0009] During the sand adding temporary plugging stage:

[0010] After the pre-temporary plugging and sanding is completed, a step-down displacement test is carried out. The displacement should be changed within the preset time between each displacement. The displacement and hole friction parameters when the displacement is stable are selected for calculation to obtain the number of open holes.

[0011] Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement;

[0012] When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, the pressure is considered stable, and then sand is added.

[0013] Preferably, in the pre-temporary plugging stage and the sand-adding temporary plugging stage, at least three injection stages with different displacements are required when performing the step-down displacement test.

[0014] Preferably, the displacement and hole friction parameters when the displacement is stable are selected to calculate the number of open holes by the following formula:

[0015]

[0016] in,

[0017] Q is displacement, m 3 / min;

[0018] ρ is the liquid density, kg / m 3 ;

[0019] ΔP per is the hole friction, MPa;

[0020] d is the hole diameter, m;

[0021] C is the release coefficient, C = 0.6 to 0.9;

[0022] n 开启 The number of holes to be opened;

[0023] Preferably, the release coefficient C is 0.85;

[0024] Preferably, the relationship between the borehole friction and the displacement and bottom hole pressure corresponding to different stages is:

[0025] ΔP per =P 井底 -ΔP nwb

[0026] ΔP per =K 1 ×Q 2

[0027]

[0028]

[0029] in,

[0030] ΔP per is the hole friction, MPa;

[0031] ΔP nwb is the near-wellbore friction, MPa;

[0032] P 井底 is the bottom hole pressure, MPa;

[0033] Q is displacement, m 3 / min;

[0034] K 1 is the friction coefficient of the hole;

[0035] K 2 is the near-wellbore friction coefficient.

[0036] Preferably, the temporary plugging agent comprises any one type of a knot temporary plugging agent, a spherical temporary plugging agent and a powder temporary plugging agent.

[0037] Preferably, in the pre-temporary plugging stage, temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0038] Preferably, during the sand adding temporary plugging stage, temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0039] Preferably, in the pre-blocking stage, the whole process is 4-6m 3 Temporary plugging agent is added through a pump with a displacement of / min.

[0040] Preferably, during the sand adding temporary plugging stage, the whole process is 4-6m 3 Temporary plugging agent is added through a pump with a displacement of / min.

[0041] Preferably, when the temporary plugging pressure increases at a preset constant displacement, it is considered that the plugging agent is in place.

[0042] Preferably, when the temporary plugging agent blocks more than 80% of the holes required for temporary plugging, the temporary plugging is considered effective, otherwise, the temporary plugging is considered ineffective.

[0043] Preferably, the preset time is less than 15 minutes;

[0044] Preferably, the step-down test has at least three steps, with each step decreasing the displacement by 0.2 to 0.5 m. 3 / min.

[0045] Preferably, when temporary blocking is effective, the boost value satisfies the following relationship:

[0046]

[0047] in,

[0048] Q is displacement, m 3 / min;

[0049] ρ is the liquid density, kg / m 3 ;

[0050] ΔP per1 Friction resistance of the hole before temporary plugging, MPa;

[0051] ΔP per2 is the friction resistance of the hole after temporary plugging, MPa;

[0052] d is the hole diameter, unit, m;

[0053] C is the release coefficient;

[0054] M is the amount of liquid sand added, kg;

[0055] n 开启 is the number of holes opened;

[0056] n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

[0057] Preferably, when temporary blocking is invalid, the boost value satisfies the following relationship:

[0058]

[0059] in,

[0060] Q is displacement, m 3 / min;

[0061] ρ is the liquid density, kg / m 3 ;

[0062] ΔP per1 To temporarily block the friction of the front hole;

[0063] ΔP per2 To temporarily block the friction of the rear hole;

[0064] d is the hole diameter, in m;

[0065] C is the release coefficient;

[0066] M is the amount of liquid sand added, kg;

[0067] n 开启 is the number of holes opened;

[0068] n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

[0069] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0070] (1) Compared with the existing temporary plugging technology, the present invention greatly improves the temporary plugging efficiency of conglomerate reservoirs by accurately adding the amount of temporary plugging agent and accurately judging whether the temporary plugging is effective, greatly improves the problem of multi-cluster non-balanced fracturing in the segment, and improves the reservoir transformation effect.

[0071] (2) The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir section of the present invention is convenient to calculate and simple to operate, and can guide the economical and efficient transformation of conglomerate reservoirs (not limited to conglomerate reservoirs). It provides a reference for improving the temporary plugging efficiency and balanced transformation of the volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir section. The formed method and operation process provide a new method for the volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir section.

[0072] (3) In combination with the results of on-site optical fiber monitoring, the present invention innovatively proposes a secondary temporary plugging process of "pre-stage + sanding stage" for conglomerate reservoirs. After pre-fracture creation, temporary plugging agent is added to ensure that unopened perforations are fully opened. At the same time, excessive erosion of the dominant perforation clusters is avoided, which leads to the problem of difficulty in temporary plugging in the later stage. Temporary plugging agent is added once more during the sanding stage to further overcome the influence of the heterogeneity of the conglomerate reservoir on the balanced fracturing of each cluster. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 (a) and different overpressure blasthole erosion diagrams of the first hole of the second cluster of 13 levels in a typical well Hawkeye test of an embodiment of the present invention, (b) different overpressure blasthole erosion diagrams of the fourth hole of the fifth cluster of 12 levels in a typical well Hawkeye test of an embodiment of the present invention, (c) different overpressure blasthole erosion diagrams of the second hole of the fourth cluster of 13 levels in a typical well Hawkeye test of an embodiment of the present invention, (d) different overpressure blasthole erosion diagrams of the second hole of the fifth cluster of 12 levels in a typical well Hawkeye test of an embodiment of the present invention; unclear texts in the figure do not affect the understanding of the technical solution, and are only used to prove through comparative display that the process transformation of multiple clusters in the current stage is unbalanced, and the present invention helps to solve this phenomenon;

[0074] Figure 2 A technical roadmap of volume fracturing and temporary plugging of multi-cluster horizontal wells in a conglomerate reservoir section according to an embodiment of the present invention;

[0075] Figure 3 (a) is a fiber optic monitoring diagram of temporary plugging by adding sand in the prior art, and (b) is a fiber optic monitoring diagram of the secondary temporary plugging process of "pre-stage + adding sand" in one embodiment of the present invention;

[0076] Figure 4 A schematic diagram of geological conditions of different temporary plugging process sections according to an embodiment of the present invention;

[0077] Figure 5 This is a schematic diagram of the production ratio of different temporary plugging process sections according to an embodiment of the present invention;

[0078] Figure 6 This is the electromagnetic monitoring result of a typical section of a well A-1 in a certain well area according to an embodiment of the present invention;

[0079] Figure 7 This is the electromagnetic monitoring result of a typical section of Well A-2 in a certain well area according to an embodiment of the present invention;

[0080] Figure 8 This is a comparison chart of the temporary plugging effectiveness of wells J-2, J-3, J-4, and J-5 according to an embodiment of the present invention. DETAILED DESCRIPTION

[0081] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0082] The present invention provides a volume fracturing temporary plugging process for multi-cluster horizontal wells in a conglomerate reservoir section, which divides the temporary plugging stage into a pre-temporary plugging stage and a sand-adding temporary plugging stage; and comprises the following steps:

[0083] In the pre-blocking stage:

[0084] During the trial extrusion stage, a step-down displacement test is conducted. Changes must be made within a preset time between each displacement. The displacement and perforation friction parameters when the displacement is stable are selected for calculation to obtain the number of open perforations.

[0085] Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement;

[0086] When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, it is considered that the pressure is stable, and then sand is added;

[0087] During the sand adding temporary plugging stage:

[0088] After the pre-temporary plugging and sanding is completed, a step-down displacement test is carried out. The displacement should be changed within the preset time between each displacement. The displacement and hole friction parameters when the displacement is stable are selected for calculation to obtain the number of open holes.

[0089] Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement;

[0090] When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, the pressure is considered stable, and then sand is added.

[0091] According to a specific embodiment of the present invention, in the pre-temporary plugging stage and the sand-adding temporary plugging stage, a step-down discharge test requires at least three injection stages with different discharge rates.

[0092] According to a specific embodiment of the present invention, the displacement and the hole friction parameters when the displacement is stable are selected to calculate the number of open holes through the following formula:

[0093]

[0094] in,

[0095] Q is displacement, m 3 / min;

[0096] ρ is the liquid density, kg / m 3 ;

[0097] ΔP per1 To temporarily block the friction of the front hole;

[0098] d is the hole diameter;

[0099] C is the release coefficient, C = 0.6 to 0.9;

[0100] n 开启 The number of holes to be opened.

[0101] According to a specific embodiment of the present invention, the release coefficient C is 0.85.

[0102] According to a specific embodiment of the present invention, the relationship between the borehole friction and the displacement and bottom hole pressure corresponding to different stages is:

[0103] ΔP per =P 井底 -ΔP nwb

[0104] ΔP per =K 1 ×Q 2

[0105]

[0106]

[0107] in,

[0108] ΔP per is the hole friction, MPa;

[0109] ΔP nwb is the near-wellbore friction, MPa;

[0110] P 井底 is the bottom hole pressure, MPa;

[0111] Q is displacement, m 3 / min;

[0112] K 1 is the friction coefficient of the hole;

[0113] K 2 is the near-wellbore friction coefficient.

[0114] According to a specific embodiment of the present invention, the temporary plugging agent includes any one type of a knot temporary plugging agent, a spherical temporary plugging agent and a powder temporary plugging agent.

[0115] According to a specific embodiment of the present invention, in the pre-temporary plugging stage, a temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0116] According to a specific embodiment of the present invention, during the sand adding temporary plugging stage, temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0117] According to a specific embodiment of the present invention, in the pre-temporary blocking stage, the whole process is 4-6m 3 Temporary plugging agent is added through a pump with a displacement of / min.

[0118] According to a specific embodiment of the present invention, during the sand adding temporary plugging stage, the whole process is 4-6m 3 Temporary plugging agent is added through a pump with a displacement of / min.

[0119] According to a specific embodiment of the present invention, when the temporary plugging pressure increases at a preset constant displacement, it is considered that the plugging agent is in place.

[0120] According to a specific embodiment of the present invention, when the temporary plugging agent blocks more than 80% of the holes required for temporary plugging, the temporary plugging is considered effective, otherwise, the temporary plugging is considered ineffective.

[0121] According to a specific embodiment of the present invention, the preset time is less than 15 minutes;

[0122] According to a specific embodiment of the present invention, the step-down displacement test is set up with at least 3 steps, and the displacement decreases by 0.2 to 0.5 m at each step. 3 / min.

[0123] According to a specific embodiment of the present invention, when temporary blocking is effective, the boost value satisfies the following relationship:

[0124]

[0125] in,

[0126] Q is displacement, m 3 / min;

[0127] ρ is the liquid density, kg / m 3 ;

[0128] ΔP per1 To temporarily block the friction of the front hole;

[0129] ΔP per2 To temporarily block the friction of the rear hole;

[0130] d is the hole diameter, m;

[0131] C is the release coefficient;

[0132] n 开启 is the number of holes opened;

[0133] n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

[0134] According to a specific embodiment of the present invention, when temporary blocking is ineffective, the boost value satisfies the following relationship:

[0135]

[0136] in,

[0137] Q is displacement, m 3 / min;

[0138] ρ is the liquid density, kg / m 3 ;

[0139] ΔP per1 To temporarily block the friction of the front hole;

[0140] ΔP per2 To temporarily block the friction of the rear hole;

[0141] d is the hole diameter, m;

[0142] C is the release coefficient;

[0143] n 开启 is the number of holes opened;

[0144] n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

[0145] Example 1

[0146] According to a specific implementation scheme of the present invention, taking J-1 well as an example, the volume fracturing temporary plugging process of multi-cluster horizontal wells in the conglomerate reservoir section of the present invention is described in detail.

[0147] Well J-1 is located in a typical deep conglomerate reservoir. The multi-cluster horizontal well volume fracturing temporary plugging process in the conglomerate reservoir section of the present invention is used to perform multi-cluster temporary plugging fracturing in the well. The application steps are as follows:

[0148] (1) Pre-temporary blocking stage:

[0149] ① During the trial extrusion stage, a step-by-step reduction test was conducted. The stable displacement value was selected by formula (1) for calculation, and the number of open holes was 30.

[0150] ② Add temporary plugging agent according to the number of 10-15 holes, the whole process is 5m 3 / min displacement pumping.

[0151] ③ After the plugging agent is in place, the pressure is increased by 5 MPa. The temporary plugging is judged to be effective by formula (3). After the pressure stabilizes, add sand for 45 m 3 .

[0152] (2) Temporary plugging stage with sand addition

[0153] ① After the pre-temporary plugging and sand addition is completed, a step-by-step displacement reduction test is carried out. The stable displacement value is selected through formula (1) for calculation, and the number of open holes is 40.

[0154] ② Add temporary plugging agent according to the number of 15-20 holes, the whole process is 5m 3 / min displacement pumping.

[0155] ③ After the plugging agent is in place, the pressure is increased by 8 MPa. The temporary plugging is judged to be effective by formula (3). After the pressure stabilizes, add 45 m of sand. 3 .

[0156] By means of optical fiber monitoring, the liquid inflow of each cluster in the conventional sand-adding 1 / 2 temporary plugging and the "pre-stage + sand-adding stage" secondary temporary plugging well section formed by the present invention were compared (see Appendix Figure 3 ): In the conventional temporary plugging process, clusters 2 and 6 are opened before temporary plugging, and clusters 2 and 6 are still dominant clusters after temporary plugging. Clusters 4 and 5 have weak fluid inflow, and clusters 1 and 3 have no fluid inflow; in the secondary temporary plugging well section, only clusters 2 and 4 are opened before temporary plugging, and all clusters are opened after temporary plugging. Clusters 2, 3, and 4 are opened during the sand-adding temporary plugging stage, and clusters 2, 3, 4, and 5 are opened after temporary plugging. The secondary temporary plugging effectively improves the uneven fluid inflow of each cluster. The temporary plugging efficiency of the secondary temporary plugging process of the whole well "pre-stage + sand-adding stage" is increased from 68% of the conventional process to 81.3%.

[0157] The production profile of different temporary plugging process construction sections was monitored by using external optical fiber. Under similar geological conditions, the secondary temporary plugging process section of "pre-stage + sand adding section" has a more obvious production increase effect than the conventional "sand adding 1 / 2 temporary plugging" (10th section). The geological conditions of different temporary plugging process sections are shown in the attached Figure 4 The production proportion of different temporary plugging process sections is shown in the attached Figure 5 ,Under similar geological conditions, the "pre-placement + 1 / 2 sand addition" temporary plugging process can effectively improve the multi-cluster temporary plugging fracturing effect within the section, further verifying the reliability of the process.

[0158] Example 2

[0159] According to a specific embodiment of the present invention, taking the two wells A-1 and A-2 in the A block as an example, the effect of the volume fracturing temporary plugging process of multi-cluster horizontal wells in the conglomerate reservoir section of the present invention is described in detail.

[0160] The temporary plugging technology of "pre-placement + 1 / 2 sand addition" of the present invention was applied to 2 wells in Block A, and the temporary plugging effect was further evaluated through electromagnetic monitoring. The electromagnetic monitoring results of the typical sections of Wells A-1 and A-2 are shown in the attached figure. Figure 6 , Attachment Figure 7 As shown, monitoring shows that the fracturing fluid advance point has changed significantly after pre-temporary plugging and temporary plugging with sand. The "pre-temporary plugging + 1 / 2 sand adding" temporary plugging process can effectively improve the unbalanced fluid inflow of each cluster, with a temporary plugging efficiency of 76.7%, which is 8.7 percentage points higher than that of the conventional temporary plugging process.

[0161] Example 3

[0162] According to a specific embodiment of the present invention, the effect of the volume fracturing temporary plugging process for multi-cluster horizontal wells in the conglomerate reservoir section of the present invention is described in detail by taking J-2, J-3, J-4 and J-5 wells as examples.

[0163] The "pre-placement + 1 / 2 sanding" temporary plugging technology was applied to 4 wells in the 4000m deep conglomerate reservoir. Temporary plugging was performed twice in the pre-placement stage and the sanding stage. Temporary plugging agent was added according to the number of perforations opened by the step-down discharge test. The comprehensive temporary plugging efficiency was 77% (see Appendix). Figure 8 ), which is 9 percentage points higher than that of conventional process wells.

[0164] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir, characterized in that: The temporary plugging stage is divided into the pre-temporary plugging stage and the sand-adding temporary plugging stage, including the following steps: In the pre-blocking stage: During the trial extrusion stage, a step-down displacement test is conducted. Changes must be made within a preset time between each displacement. The displacement with a stable displacement and the friction parameters of the perforations are selected for calculation to obtain the number of perforations to be opened. Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement; When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, it is considered that the pressure is stable, and then sand is added; During the sand adding temporary plugging stage: After the pre-temporary plugging and sanding is completed, a step-down displacement test is carried out. The displacement should be changed within the preset time between each displacement. The displacement and hole friction parameters when the displacement is stable are selected for calculation to obtain the number of open holes. Add temporary plugging agent according to the number of open holes, and add it through the pump at a preset displacement; When the plugging agent is in place, the pressure increase method is used to determine whether the temporary plugging is effective. If the temporary plugging is ineffective, continue to add temporary plugging agent; if the temporary plugging is effective, when the pressure fluctuates within the preset range, the pressure is considered stable, and then sand is added.

2. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: During the pre-temporary plugging stage and the sand-adding temporary plugging stage, a step-down discharge test requires at least three injection stages with different discharge volumes.

3. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: Select the displacement and hole friction parameters when the displacement is stable and calculate the number of open holes by the following formula: in, Q is displacement, m 3 / min; ρ is the liquid density, kg / m 3 ; ΔP per is the hole friction, MPa; d is the hole diameter, m; C is the release coefficient, C = 0.6 to 0.9; n 开启 The number of holes to be opened.

4. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir section according to claim 3, characterized in that: The relationship between borehole friction and the displacement and bottom hole pressure corresponding to different stages is: ΔP per =P 井底 -ΔP nwb ΔP per =K1×Q 2 in, ΔP per is the hole friction, MPa; ΔP nwb is the near-wellbore friction, MPa; P 井底 is the bottom hole pressure, MPa; Q is displacement, m 3 / min; K1 is the friction coefficient of the hole; K2 is the friction coefficient near the wellbore.

5. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: The temporary plugging agent includes any type of knot temporary plugging agent, spherical temporary plugging agent and powder temporary plugging agent.

6. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: During the pre-temporary plugging stage and the sand-adding temporary plugging stage, temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

7. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: During the pre-blocking stage and the sand-adding temporary blocking stage, the whole process is 4-6m 3 Temporary plugging agent is added through a pump with a displacement of / min.

8. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: When the temporary plugging pressure increases at a preset constant displacement, it is considered that the plugging agent is in place.

9. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: When the temporary plugging agent blocks more than 80% of the holes required for temporary plugging, the temporary plugging is considered effective; otherwise, the temporary plugging is considered ineffective.

10. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to claim 1, characterized in that: The preset time is less than 15 minutes; the step-down test is set up with at least 3 steps, and the displacement decreases by 0.2 to 0.5 m at each step. 3 / min.

11. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to any one of claims 1 to 10, characterized in that: When temporary blocking is effective, the boost value satisfies the following relationship: in, Q is displacement, m 3 / min; ρ is the liquid density, kg / m 3 ; ΔP per1 Friction resistance of the hole before temporary plugging, MPa; ΔP per2 is the friction resistance of the hole after temporary plugging, MPa; d is the hole diameter, m; C is the release coefficient; n 开启 is the number of holes opened; n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

12. The volume fracturing temporary plugging process for multiple clusters of horizontal wells in a conglomerate reservoir according to any one of claims 1 to 10, characterized in that: When temporary blocking is invalid, the boost value satisfies the following relationship: in, Q is displacement, m 3 / min; ρ is the liquid density, kg / m 3 ; ΔP per1 Friction resistance of the hole before temporary plugging, MPa; ΔP per2 is the friction resistance of the hole after temporary plugging, MPa; d is the hole diameter, m; C is the release coefficient; n 开启 is the number of holes opened; n 暂堵 The number of holes that need to be blocked by temporary blocking agent.

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