A temporary plugging technology for volume fracturing of multi-cluster horizontal wells in a conglomerate reservoir section

Abstract

The present application provides a kind of conglomerate reservoir segment within multi-cluster horizontal well volume fracturing temporary plugging process, belong to oil and gas stimulation technical field.The present application carries out two temporary plugging in preposition stage and sanding stage in segment within multi-cluster temporary plugging fracturing;Carry out ladder drop displacement test in test squeezing stage, change as quickly as possible between each displacement, select displacement and hole eye friction parameter when displacement is stable to calculate, obtain open hole eye quantity;According to open hole eye quantity, add temporary plugging agent;When plugging agent is in place, judge whether temporary plugging is effective by pressure increasing method, if temporary plugging is invalid, then continue to add temporary plugging agent;If temporary plugging is effective, when pressure fluctuates in preset range, consider that pressure is stable, then sand is added;In sanding temporary plugging stage: use the same process as preposition temporary plugging stage.The present application can effectively improve the plugging efficiency of segment within multi-cluster temporary plugging fracturing, and has very important significance for solving the difficulty of conglomerate reservoir temporary plugging construction and poor temporary plugging effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas stimulation, in particular to a temporary plugging process for volume fracturing of multi-cluster horizontal wells in conglomerate reservoirs. BACKGROUND

[0002] With the popularization and application of volume fracturing technology for horizontal wells, the multi-cluster temporary plugging fracturing process in the horizontal well section has become an important means to improve the uniformity of fracturing reconstruction and reduce costs and increase efficiency. However, due to the strong heterogeneity of conglomerate reservoirs, the balanced initiation effect is limited when the multi-cluster + limit flow + temporary plugging fracturing process is used in the section. At the perforation hole, the velocity of the sand-carrying liquid will increase sharply due to the structural mutation, and when it passes through the perforation hole into the formation at high speed, it will cause severe erosion at the entrance of the hole (the downhole eagle eye monitoring results are shown in the attached Figure 1 ), which further reduces the pressure difference inside and outside the hole, making it difficult for the temporary plugging material to effectively plug the perforation, and the temporary plugging effectiveness is poor, affecting the fracturing effect. SUMMARY

[0003] To solve the problems in the prior art, the present application provides a temporary plugging process for volume fracturing of multi-cluster horizontal wells in conglomerate reservoirs, which performs temporary plugging twice in the pre-positioning stage and the sand-adding stage in the multi-cluster temporary plugging fracturing in the section; performs stepwise descending displacement test in the trial squeezing stage, changes as quickly as possible between each displacement, selects the displacement and hole friction parameters when the displacement is stable to calculate, and considers that the displacement is stable when the displacement fluctuation is less than 0.05 m 3 / min, and obtains the number of open holes; adds temporary plugging agent according to the number of open holes; when the plugging agent is in place, the pressure rises when the constant displacement is sent, the temporary plugging is judged by pressure rising method, if the temporary plugging is invalid, the temporary plugging agent is continuously added; 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; in the sand-adding temporary plugging stage, the same process as the pre-positioning temporary plugging stage is adopted. The present application can effectively improve the plugging effectiveness of the multi-cluster temporary plugging fracturing in the section, and has great significance for solving the temporary plugging construction difficulty and poor temporary plugging effect in conglomerate reservoirs.

[0004] The present application provides a temporary plugging process for volume fracturing of multi-cluster horizontal wells in conglomerate reservoirs, which divides the temporary plugging stage into pre-positioning temporary plugging stage and sand-adding temporary plugging stage; comprising the following steps:

[0005] In the pre-positioning temporary plugging stage:

[0006] In the trial squeezing stage, stepwise descending displacement test is performed, and changes within the preset time between each displacement, the displacement and hole friction parameters when the displacement is stable are selected for calculation, and the number of open holes is obtained;

[0007] According to the number of open holes, the temporary plugging agent is added, and the pump is used to add the temporary plugging agent at a preset displacement;

[0008] When the plugging agent is in place, whether the temporary plugging is effective is determined by the pressure boosting method. If the temporary plugging is not effective, the temporary plugging agent is continuously added. If the temporary plugging is effective, when the pressure fluctuates within a preset range, it is considered that the pressure is stable, and then the sand is added.

[0009] In the sanding temporary plugging stage:

[0010] After the pre-plugging sanding is completed, the stepwise displacement reduction test is performed. The displacement and the hole friction parameter at the time when the displacement is stable are selected to calculate the number of open holes.

[0011] According to the number of open holes, the temporary plugging agent is added, and the pump is used to add the temporary plugging agent at a preset displacement;

[0012] When the plugging agent is in place, whether the temporary plugging is effective is determined by the pressure boosting method. If the temporary plugging is not effective, the temporary plugging agent is continuously added. If the temporary plugging is effective, when the pressure fluctuates within a preset range, it is considered that the pressure is stable, and then the sand is added.

[0013] Preferably, in the pre-plugging stage and the sanding temporary plugging stage, the stepwise displacement reduction test requires at least three different injection stages of displacement.

[0014] Preferably, the number of open holes is calculated by the following formula by selecting the displacement and the hole friction parameter at the time when the displacement is stable:

[0015]

[0016] wherein,

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

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

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

[0020] d is the hole diameter, m;

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

[0022] n 开启 is the number of open holes;

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

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

[0025] ΔP per = P 井底 - ΔP nwb

[0026] ΔP per = K1 x Q 2

[0027]

[0028]

[0029] wherein,

[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 the flow rate, m 3 / min;

[0034] K1 is the hole friction coefficient;

[0035] K2 is the near wellbore friction coefficient.

[0036] Preferably, the bridging agent comprises any one type of the following: a knotted bridging agent, a spherical bridging agent and a powder bridging agent.

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

[0038] Preferably, in the sand-bridging stage, the bridging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0039] Preferably, in the pre-bridging stage, the bridging agent is added by the pump at a flow rate of 4-6 m 3 / min throughout the whole process.

[0040] Preferably, in the sand-bridging stage, the bridging agent is added by the pump at a flow rate of 4-6 m 3 / min throughout the whole process.

[0041] Preferably, when the bridging pressure rises at a preset constant flow rate, it is considered that the bridging agent is in place.

[0042] Preferably, when the bridging agent blocks more than 80% of the number of holes required for bridging, it is considered that the bridging is effective, otherwise, it is considered that the bridging is ineffective.

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

[0044] Preferably, the stepwise displacement test sets at least 3 steps, each step decreasing the displacement by 0.2-0.5 m 3 / min.

[0045] Preferably, when the temporary plugging is effective, the pressure increase value satisfies the following relationship:

[0046]

[0047] wherein,

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

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

[0050] AP per1 is the pre-plugging hole friction, MPa;

[0051] AP per2 is the post-plugging hole friction, MPa;

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

[0053] C is the release coefficient;

[0054] M is the liquid sanding amount, kg;

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

[0056] n 暂堵 is the number of holes to be plugged by the temporary plugging agent.

[0057] Preferably, when the temporary plugging is ineffective, the pressure increase value satisfies the following relationship:

[0058]

[0059] wherein,

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

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

[0062] AP per1 is the pre-plugging hole friction;

[0063] AP per2 is the post-plugging hole friction;

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

[0065] C is the release coefficient;

[0066] M is the liquid sanding amount, kg;

[0067] n 开启 is the number of open perforations;

[0068] n 暂堵 is the number of perforations that need to be plugged by the temporary plugging agent.

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

[0070] (1) Compared with the existing temporary plugging process, the present application greatly improves the efficiency of temporary plugging in conglomerate reservoirs, greatly improves the problem of uneven fracturing in multiple clusters in the section, and improves the reservoir reconstruction effect by accurately adding the amount of temporary plugging agent and accurately judging whether the temporary plugging is effective.

[0071] (2) The conglomerate reservoir multi-cluster horizontal well volume fracturing temporary plugging process of the present application is convenient to calculate and easy to operate, can guide the economic and efficient reconstruction of conglomerate reservoirs (not limited to conglomerate reservoirs), and provides a reference for improving the temporary plugging efficiency and balanced reconstruction of the multi-cluster horizontal well volume fracturing temporary plugging process. The method and operation process formed provide a new method for the multi-cluster horizontal well volume fracturing temporary plugging process in the conglomerate reservoir section.

[0072] (3) The present application innovatively proposes a two-time temporary plugging process of "prepositioning section + sanding section" for conglomerate reservoirs. After prepositioning fracturing, the temporary plugging agent is added to ensure that the unopened perforations are fully opened, and at the same time, the problem of excessive erosion of the dominant perforation cluster, which leads to high difficulty in temporary plugging in the later stage, is avoided. A temporary plugging agent is added during the sanding stage to further overcome the influence of conglomerate reservoir heterogeneity on balanced fracturing of each cluster. BRIEF DESCRIPTION OF DRAWINGS

[0073] Figure 1 (a) Different overpressure perforation erosion diagrams of the first hole of the second cluster of the 13th level of the typical well of an embodiment of the present application, and (b) Different overpressure perforation erosion diagrams of the fourth hole of the fifth cluster of the 12th level of an embodiment of the present application, (c) Different overpressure perforation erosion diagrams of the second hole of the fourth cluster of the 13th level of an embodiment of the present application, (d) Different overpressure perforation erosion diagrams of the second hole of the fifth cluster of the 12th level of an embodiment of the present application; The unclear text in the figure does not affect the understanding of the technical solution, and is only used to prove that the current multi-cluster process reconstruction is uneven, and the present application helps to solve this phenomenon;

[0074] Figure 2 is a technical route map of the conglomerate reservoir multi-cluster horizontal well volume fracturing temporary plugging process of an embodiment of the present application;

[0075] Figure 3Fig. (a) is a prior art sand-plugging fiber monitoring chart, and Fig. (b) is a fiber monitoring chart of a “prepad section + sand-plugging section” secondary plugging process according to an embodiment of the present application;

[0076] Figure 4 Fig. 4 is a schematic diagram of geological conditions of different plugging process sections according to an embodiment of the present application;

[0077] Figure 5 Fig. 5 is a schematic diagram of production proportion of different plugging process sections according to an embodiment of the present application;

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

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

[0080] Figure 8 Fig. 8 is a comparison chart of plugging efficiency of Wells J-2, J-3, J-4 and J-5 according to an embodiment of the present application. DETAILED DESCRIPTION

[0081] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

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

[0083] In the prepad plugging stage:

[0084] In the stepwise reduced displacement test, the displacement and the hole friction parameters at the time when the displacement is stable are selected for calculation to obtain the number of open holes.

[0085] The plugging agent is added according to the number of open holes, and the plugging agent is added by the pump at a preset displacement.

[0086] When the plugging agent is in place, the pressure boosting method is used to determine whether the plugging is effective. If the plugging is not effective, the plugging agent is continuously added. If the plugging is effective, when the pressure fluctuates within a preset range, it is considered that the pressure is stable, and then sand-plugging is performed.

[0087] In the sand-plugging stage:

[0088] After the prepad plugging and sand-plugging are completed, the stepwise reduced displacement test is performed, the displacement and the hole friction parameters at the time when the displacement is stable are selected for calculation to obtain the number of open holes.

[0089] According to the open hole number, the temporary plugging agent is added, and the pump is used to add the agent with a preset displacement;

[0090] When the plugging agent is in place, the pressure boosting method is used to determine whether the temporary plugging is effective, if the temporary plugging is not effective, the temporary plugging agent is continuously added, if the temporary plugging is effective, when the pressure fluctuates in a preset range, it is considered that the pressure is stable, and then the sand is added.

[0091] According to one specific embodiment of the present application, when the stepwise displacement reduction test is performed in the pre-plugging stage and the sand plugging stage, at least three injection stages with different displacements are required.

[0092] According to one specific embodiment of the present application, the open hole number is calculated according to the displacement and the hole friction parameters when the displacement is stable by the following formula:

[0093]

[0094] Wherein,

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

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

[0097] ΔP per1 is the hole friction before plugging;

[0098] d is the hole diameter;

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

[0100] n 开启 is the open hole number.

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

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

[0103] ΔP per =P 井底 -ΔP nwb

[0104] ΔP per =K1×Q 2

[0105]

[0106]

[0107] Wherein,

[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 the flow rate, m 3 / min;

[0112] K1 is the hole friction coefficient;

[0113] K2 is the near wellbore friction coefficient.

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

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

[0116] According to one specific embodiment of the present application, in the sanding plugging stage, the temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

[0117] According to one specific embodiment of the present application, in the pre-plugging stage, the temporary plugging agent is added by the pump with a flow rate of 4-6 m 3 / min throughout the whole process.

[0118] According to one specific embodiment of the present application, in the sanding plugging stage, the temporary plugging agent is added by the pump with a flow rate of 4-6 m 3 / min throughout the whole process.

[0119] According to one specific embodiment of the present application, when the plugging pressure rises with a preset constant flow rate, it is considered that the plugging agent is in place.

[0120] According to one specific embodiment of the present application, when the temporary plugging agent plugs more than 80% of the required number of holes, it is considered that the plugging is effective, otherwise, it is considered that the plugging is ineffective.

[0121] According to one specific embodiment of the present application, the preset time is less than 15 min;

[0122] According to one specific embodiment of the present application, the stepwise flow rate test is provided with at least 3 steps, and the flow rate of each step is decreased by 0.2-0.5 m 3 / min.

[0123] According to one specific embodiment of the present application, when the plugging is effective, the pressure rise value satisfies the following relationship:

[0124]

[0125] wherein,

[0126] Q is the flow rate, m 3 / min;

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

[0128] AP is the pre-plugging hole frictional resistance; per1 ;

[0129] AP is the post-plugging hole frictional resistance; per2 ;

[0130] d is the hole diameter, m;

[0131] C is the release coefficient;

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

[0133] n 暂堵 is the number of holes to be plugged by the temporary plugging agent.

[0134] According to one specific embodiment of the present application, when the temporary plugging is ineffective, the pressure boost value satisfies the following relationship:

[0135]

[0136] wherein,

[0137] Q is the flow rate, m 3 / min;

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

[0139] AP is the pre-plugging hole frictional resistance; per1 ;

[0140] AP is the post-plugging hole frictional resistance; per2 ;

[0141] d is the hole diameter, m;

[0142] C is the release coefficient;

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

[0144] n 暂堵 is the number of holes to be plugged by the temporary plugging agent.

[0145] Example 1

[0146] According to one specific embodiment of the present application, the volume fracturing temporary plugging technology of multi-cluster horizontal wells in conglomerate reservoir sections is described in detail taking well J-1 as an example.

[0147] Well J-1 is located in a typical deep sand-conglomerate reservoir, and the volume fracturing temporary plugging technology of multi-cluster horizontal wells in conglomerate reservoir sections is applied to the well to perform multi-cluster temporary plugging fracturing in the section, and the application steps are as follows:

[0148] (1) Pre-plugging stage:

[0149] ① Ladder-like displacement reduction test is performed in the trial squeezing stage, a stable displacement value is selected through formula (1) for calculation, and it is concluded that 30 holes are opened.

[0150] ② Temporary plugging agent is added according to the number of 10-15 holes, and pumping is performed at a displacement of 5 m 3 / min throughout the whole process.

[0151] ③ After the plugging agent is in place, the pressure is increased by 5 MPa, formula (3) is used to judge whether the temporary plugging is effective, and after the pressure is stable, 45 m 3 of sand is added.

[0152] (2) Sand plugging stage

[0153] ① After the pre-plugging sand plugging is completed, ladder-like displacement reduction test is performed, a stable displacement value is selected through formula (1) for calculation, and it is concluded that 40 holes are opened.

[0154] ② Temporary plugging agent is added according to the number of 15-20 holes, and pumping is performed at a displacement of 5 m 3 / min throughout the whole process.

[0155] ③ After the plugging agent is in place, the pressure is increased by 8 MPa, formula (3) is used to judge whether the temporary plugging is effective, and after the pressure is stable, 45 m 3 of sand is added.

[0156] Through optical fiber monitoring means, the liquid inflow of each cluster of the well section formed by the conventional sand plugging 1 / 2 temporary plugging and the "pre-plugging section + sand plugging section" secondary temporary plugging of the present application is compared (see the attached Figure 3 ): Before temporary plugging, 2 and 6 clusters are opened in the conventional temporary plugging process, and after temporary plugging, 2 and 6 clusters are still dominant clusters, 4 and 5 clusters have weak liquid inflow, and 1 and 3 clusters cannot inflow; before temporary plugging, only 2 and 4 clusters are opened in the secondary temporary plugging well section, and after temporary plugging, each cluster is opened, 2, 3 and 4 clusters are opened in the sand plugging stage, and after temporary plugging, 2, 3, 4 and 5 clusters are opened, the secondary temporary plugging effectively improves the unbalanced liquid inflow of each cluster. The effective rate of the "pre-plugging section + sand plugging section" secondary temporary plugging technology of the whole well is increased from 68% of the conventional technology to 81.3%.

[0157] The optical fiber outside the pipe is used for monitoring the production profile of the construction sections with different temporary plugging processes. In the case of similar geological conditions, the production effect of the secondary temporary plugging process of the "preposition section + sand section" is obviously better than that of the conventional "sand 1 / 2 temporary plugging" (the 10th section). The geological conditions of different temporary plugging process sections are shown in the following Figure 4 The production proportion of different temporary plugging process sections is shown in the following Figure 5 In the case of similar geological conditions, the temporary plugging process of "preposition + 1 / 2 sand" can effectively improve the effect of multi-cluster temporary plugging and fracturing in the section, and further verifies the reliability of the process.

[0158] Example 2

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

[0160] The temporary plugging process of "preposition + 1 / 2 sand" is applied in the A block for 2 well times. The temporary plugging effect is further evaluated through electromagnetic monitoring. The electromagnetic monitoring results of typical sections of A-1 and A-2 wells are shown in the following Figure 6 and Figure 7 It is shown that the monitoring shows that the fracturing fluid breakthrough points are obviously changed after preposition temporary plugging and sand temporary plugging. The temporary plugging process of "preposition + 1 / 2 sand" can effectively improve the non-uniform liquid inlet of each cluster. The temporary plugging efficiency is 76.7%, which is 8.7 percentage points higher than that of the conventional temporary plugging process.

[0161] Example 3

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

[0163] The temporary plugging process of "preposition + 1 / 2 sand" is applied in the 4000m deep conglomerate reservoir for 4 well times. Temporary plugging is carried out twice in the preposition stage and the sand stage. The temporary plugging agent is added according to the number of perforations opened by the stepwise drawdown test. The comprehensive temporary plugging efficiency is 77% (see the following Figure 8 ), which is 9 percentage points higher than that of the conventional process well.

[0164] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A temporary plugging process for volume fracturing of multi-cluster horizontal wells in a conglomerate reservoir section, characterized in that, The temporary plugging stage is divided into a pre-plugging stage and a sanding temporary plugging stage, and includes the following steps: In the pre-plugging stage: In the trial squeezing stage, stepwise reduced displacement test is performed, and the displacement and the hole friction parameter are changed in a preset time between each displacement, the displacement and the hole friction parameter are selected when the displacement is stable, and the number of open holes is obtained; The temporary plugging agent is added according to the number of open holes, and is added by the pump at a preset displacement; When the plugging agent is in place, it is judged whether the temporary plugging is effective by the pressure boosting method, if the temporary plugging is not effective, the temporary plugging agent is continuously added, if the temporary plugging is effective, when the pressure fluctuates in a preset range, it is considered that the pressure is stable, and then sanding is performed. In the sanding temporary plugging stage: After the pre-plugging sanding is completed, stepwise reduced displacement test is performed, and the displacement and the hole friction parameter are changed in a preset time between each displacement, the displacement and the hole friction parameter are selected when the displacement is stable, and the number of open holes is obtained; The temporary plugging agent is added according to the number of open holes, and is added by the pump at a preset displacement; When the plugging agent is in place, it is judged whether the temporary plugging is effective by the pressure boosting method, if the temporary plugging is not effective, the temporary plugging agent is continuously added, if the temporary plugging is effective, when the pressure fluctuates in a preset range, it is considered that the pressure is stable, and then sanding is performed.

2. The temporary barrier fracturing process of multiple cluster horizontal wells in conglomerate reservoir section according to claim 1, characterized in that, In the pre-plugging stage and the sanding temporary plugging stage, stepwise reduced displacement test is required to have at least three different displacement injection stages.

3. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 2, wherein, The number of open holes is obtained by the following formula by selecting the displacement and the hole friction parameter when the displacement is stable: ； Wherein, Q is the displacement, m 3 / min; Density of liquid, kg / m 3 ; MPa for hole friction d for the hole diameter, m; C C = 0.6-0.9 for the release factor. To open the number of eyelets.

4. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 3, wherein, The relationship between the hole friction and the displacement and the bottom hole pressure corresponding to different stages is: Wherein, MPa for hole friction For near wellbore drag, MPa; BHP is the bottom hole pressure, MPa; Q is the displacement, m 3 / min; K 1 is the hole friction coefficient; K 2 is a near wellbore friction factor.

5. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, The temporary plugging agent includes any one type of rope knot temporary plugging agent, spherical temporary plugging agent and powder temporary plugging agent.

6. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, In the pre-plugging stage and the sanding temporary plugging stage, the temporary plugging agent is added according to 1 / 2-1 / 3 of the number of open holes.

7. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, In the pre-blocking stage and the sanding blocking stage, the displacement of the pump is 4-6 m 3 / min throughout the process.

8. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, When the temporary plugging pressure rises at a preset constant displacement, it is considered that the plugging agent is in place.

9. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, When the temporary plugging agent plugs more than 80% of the required temporary plugging hole number, it is considered that the temporary plugging is effective, otherwise, it is considered that the temporary plugging is not effective.

10. The temporary barrier process for volume fracturing of multi-cluster horizontal wells within a conglomerate reservoir interval of claim 1, wherein, The preset time is less than 15 min; the stepwise discharge capacity test is set with at least 3 steps, and the discharge capacity of each step is reduced by 0.2-0.5 m 3 / min.

11. The temporary barrier fracturing process of multiple cluster horizontal wells in conglomerate reservoir section according to any one of claims 1-10, characterized in that, When the temporary plugging is effective, the pressure boosting value satisfies the following relationship: boost value ≥ ; Wherein, Q for displacement, m 3 / min; Density of liquid, kg / m 3 ; To temporarily plug the front hole, MPa; To temporarily plug the hole, MPa; d for the hole diameter, m; C is the release factor; n 开启 Number of open holes; n 暂堵 The number of holes to be plugged by the temporary plugging agent.

12. The temporary barrier fracturing process of multiple cluster horizontal wells in conglomerate reservoir section according to any one of claims 1-10, characterized in that, When the temporary plugging is not effective, the pressure boosting value satisfies the following relationship: boost value < 0 Wherein, Q for displacement, m 3 / min; Density of liquid, kg / m 3 ; To temporarily plug the front hole, MPa; To temporarily plug the hole, MPa; d for the hole diameter, m; C is the release factor; n 开启 Number of open eyes; n 暂堵 The number of holes to be plugged by the temporary plugging agent.

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