Using method and application of spherical shell type rope knot temporary plugging agent for fracturing

Abstract

The invention relates to the technical field of oil and gas field development, in particular to a use method and application of a spherical shell type rope knot temporary plugging agent for fracturing, and discloses the use method of the spherical shell type rope knot temporary plugging agent for fracturing, the use method of the spherical shell type rope knot temporary plugging agent for fracturing is simple and easy to implement, the number of temporary plugging agents is easy to calculate, and the number of the temporary plugging agents is small. Temporary plugging agent products of different sizes are matched with different plugging perforation apertures, the temporary plugging diversion fracturing construction effect is good, and the temporary plugging diversion construction requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development, and in particular to a use method and application of a spherical shell type knot temporary plugging agent for fracturing. Background Art

[0002] In the fracturing of heterogeneous reservoirs, in order to effectively improve the degree of reservoir transformation and realize uniform transformation, it is generally necessary to add temporary plugging agents to carry out temporary plugging and diversion fracturing construction, temporarily plugging the blastholes of the already fractured layer, forcing the wellbore pressure to rise to the fracture pressure value of the untransformed fracturing layer, realizing the expansion of cracks in the untransformed layer and opening up new oil and gas seepage channels.

[0003] Spherical shell knot temporary plugging agent has been increasingly widely used because it has a good temporary plugging effect on irregular perforation holes caused by abrasion. At present, there is a lack of methods for using spherical shell knot temporary plugging agent in on-site fracturing, resulting in poor matching between the number of spherical shell knot temporary plugging agent and the number of temporarily plugged perforation holes or the size of spherical shell knot temporary plugging agent and the size of perforation holes, which affects the temporary plugging effect. Summary of the invention

[0004] The purpose of the present invention is to provide a method for using a spherical shell type knot temporary plugging agent for fracturing and its application.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] In a first aspect, the present invention provides a method for using a spherical shell type knot temporary plugging agent for fracturing, comprising the following steps:

[0007] S1. Selecting a spherical shell knot temporary plugging agent that matches the hole size according to the perforation hole parameters;

[0008] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0009] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0010] S4, perform pre-temporary plugging fracturing construction according to the construction pumping procedure, after completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid, reduce the displacement, open the plug of the lower plug valve, release the spherical shell type rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid and the spherical shell type rope knot temporary plugging agent to the blasthole;

[0011] S5. Measure the amount of liquid delivered by the displacement pump, observe and record the pressure increase of the spherical shell type knot temporary plugging agent.

[0012] Furthermore,

[0013] The following steps are also included:

[0014] S6. After the spherical shell type knot temporary plugging agent is in place, the displacement is increased to the construction displacement before temporary plugging, and the next step of normal construction procedure is entered.

[0015] Furthermore,

[0016] The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 73 gun-73 bullet perforation, using a temporary plugging with a diameter of 16-18mm.

[0017] Furthermore,

[0018] The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 89 guns-89 bullets perforation, using a temporary plugging with a diameter of 18-20mm.

[0019] Furthermore,

[0020] The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 102 gun-127 bullet perforation, using a temporary plugging with a diameter of 20-22mm.

[0021] Furthermore,

[0022] Calculation of the number of spherical shell type knot temporary plugging agents: N = (1.1-1.3) × n, where N represents the number of spherical shell type knot temporary plugging agents; n represents the number of perforation holes to be temporarily plugged.

[0023] Furthermore,

[0024] In step S4, the displacement is reduced to 3m 3 / min.

[0025] Furthermore,

[0026] In step S5, the displacement pumping liquid volume is measured to reach one wellbore volume, and the pressure increase of the spherical shell type knot temporary plugging agent is observed and recorded.

[0027] Furthermore,

[0028] In step S1, a spherical shell knot temporary plugging agent matching the hole size is selected according to the perforating gun type, bullet type and other perforating hole parameters.

[0029] In a second aspect, the present invention provides an application method of the spherical shell type knot temporary plugging agent for fracturing in temporary plugging and diverting fracturing construction.

[0030] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0031] Compared with the existing technology, the spherical shell knot temporary plugging agent for fracturing is simple and easy to use, the amount of temporary plugging agent is simple to calculate, temporary plugging agent products of different sizes match different plugging perforation apertures, the temporary plugging and diverting fracturing construction effect is good, and the temporary plugging and diverting construction requirements are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a fracturing construction curve diagram involved in Example 1;

[0034] Figure 2 It is a fracturing construction curve diagram involved in Example 2;

[0035] Figure 3 is a fracturing construction curve diagram involved in Example 3;

[0036] Figure 4 is a fracturing construction curve diagram involved in Example 4;

[0037] Figure 5 This is a fracturing construction curve diagram involved in Example 5. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0040] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods; the reagents, materials, etc. used in the following examples, unless otherwise specified, can be obtained from commercial channels.

[0041] Example 1

[0042] The application of the ball shell knot temporary plugging agent was used to carry out temporary plugging and fracturing in a tight sandstone reservoir well 34-35#. The target reservoir of the well was perforated with 73 guns and 73 bullets for a total of 4m, with a hole density of 16 holes / meter, and a total of 64 perforated holes, of which 48 perforated holes were to be plugged. 1 / 2 casing-φ48.26mm tubing annulus injection fracturing, construction displacement is 5m 3 / min, the specific steps are as follows:

[0043] S1. Select a spherical shell knot temporary plugging agent that matches the hole size according to the perforating gun type, bullet type and other perforating hole parameters;

[0044] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0045] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0046] S4. Perform pre-temporary plugging fracturing according to the construction pumping procedure. After completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid to reduce the displacement to 3m 3 / min, open the stopcock of the lower stopcock valve, release the spherical shell rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid to deliver the spherical shell rope knot temporary plugging agent to the blasthole;

[0047] S5. Measure the displacement pumping liquid volume to reach 1 wellbore volume. After the ball shell knot temporarily blocks the ball in place, the pressure rises by 12.4MPa (refer to Figure 1 );

[0048] S6, after the ball shell type knot temporary plugging agent is in place, the discharge volume is increased to 5m before temporary plugging 3 / min construction displacement, enter the next step of normal construction procedure.

[0049] Preferably, in step S1, the size of the spherical shell type knot temporary plugging agent is matched with the size of the perforation hole and is selected to be plugged with a spherical shell type knot temporary plugging agent with a diameter of 16-18 mm.

[0050] Preferably, the amount of spherical shell knot temporary plugging agent in step S2 is calculated as: N = 1.2 × 48 ≈ 58.

[0051] Example 2

[0052] The application of the ball shell knot temporary plugging agent was used to carry out temporary plugging and fracturing in a tight sandstone reservoir well 32-33#. The target reservoir of the well was perforated with 89 guns and 89 bullets, with a total perforation of 3m, a hole density of 16 holes / meter, and a total of 48 perforated holes, of which 16 perforated holes were to be plugged.1 / 2 casing fracturing, operation displacement is 7m 3 / min, the specific steps are as follows:

[0053] S1. Select a spherical shell knot temporary plugging agent that matches the hole size according to the perforating gun type, bullet type and other perforating hole parameters;

[0054] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0055] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0056] S4. Perform pre-temporary plugging fracturing according to the construction pumping procedure. After completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid to reduce the displacement to 3m 3 / min, open the stopcock of the lower stopcock valve, release the spherical shell rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid to deliver the spherical shell rope knot temporary plugging agent to the blasthole;

[0057] S5, measure the displacement pumping liquid volume, reach 1 wellbore volume, the ball shell knot temporarily plugs the ball into place, and the pressure rises by 5.2MPa (refer to Figure 2 );

[0058] S6, after the ball shell type knot temporary plugging agent is in place, the discharge volume is increased to 7m before temporary plugging 3 / min construction displacement, enter the next step of normal construction procedure.

[0059] Preferably, in step S1, the size of the spherical shell type knot temporary plugging agent is matched with the size of the perforation hole and selected to be plugged by using a spherical shell type knot temporary plugging agent of 18-20 mm.

[0060] Preferably, the amount of spherical shell knot temporary plugging agent in step S2 is calculated as: N=1.1×16≈19.

[0061] Example 3

[0062] The application of the ball shell knot temporary plugging agent was used to carry out temporary plugging and fracturing in a tight sandstone reservoir well 17-19#. The target reservoir of the well was perforated with 89 guns and 89 bullets, with a total perforation of 4m, a hole density of 16 holes / meter, and a total of 64 perforation holes, of which 48 perforation holes were to be plugged. 1 / 2 casing fracturing, operation displacement is 5m 3 / min, the specific steps are as follows:

[0063] S1. Select a spherical shell knot temporary plugging agent that matches the hole size according to the perforating gun type, bullet type and other perforating hole parameters;

[0064] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0065] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0066] S4. Perform pre-temporary plugging fracturing according to the construction pumping procedure. After completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid to reduce the displacement to 3m 3 / min, open the stopcock of the lower stopcock valve, release the spherical shell rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid to deliver the spherical shell rope knot temporary plugging agent to the blasthole;

[0067] S5. Measure the displacement pumping liquid volume to reach 1 wellbore volume. After the ball shell knot temporarily blocks the ball in place, the pressure rises by 1.5MPa (refer to Figure 3 );

[0068] S6, after the ball shell type knot temporary plugging agent is in place, the discharge volume is increased to 8m before temporary plugging 3 / min construction displacement, enter the next step of normal construction procedure.

[0069] Preferably, in step S1, the size of the spherical shell type knot temporary plugging agent is matched with the size of the perforation hole and selected to be plugged by using a spherical shell type knot temporary plugging agent of 18-20 mm.

[0070] Preferably, the amount of spherical shell knot temporary plugging agent in step S2 is calculated as: N = 1.1 × 48 ≈ 53.

[0071] Example 4

[0072] The application of the ball shell knot temporary plugging agent was used to carry out temporary plugging and fracturing in a tight sandstone reservoir well 17-19#. The target reservoir of the well was perforated with 102 guns and 127 bullets, with a total perforation of 3m, a hole density of 16 holes / meter, and a total of 48 perforated holes, of which 16 perforated holes were to be plugged, and 4 1 / 2 casing fracturing, operation displacement is 6m 3 / min, the specific steps are as follows:

[0073] S1. Select a spherical shell knot temporary plugging agent that matches the hole size according to the perforating gun type, bullet type and other perforating hole parameters;

[0074] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0075] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0076] S4. Perform pre-temporary plugging fracturing according to the construction pumping procedure. After completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid to reduce the displacement to 3m 3 / min, open the stopcock of the lower stopcock valve, release the spherical shell rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid to deliver the spherical shell rope knot temporary plugging agent to the blasthole;

[0077] S5. Measure the displacement pumping liquid volume to reach 1 wellbore volume. After the ball shell knot temporarily blocks the ball in place, the pressure rises by 2.8MPa (refer to Figure 4 );

[0078] S6, after the ball shell type knot temporary plugging agent is in place, the discharge volume is increased to 6m before temporary plugging 3 / min construction displacement, enter the next step of normal construction procedure.

[0079] Preferably, in step S1, the size of the spherical shell type knot temporary plugging agent is matched with the size of the perforation hole and is selected to be plugged by using a 20-22 mm spherical shell type knot temporary plugging agent.

[0080] Preferably, the amount of spherical shell knot temporary plugging agent in step S2 is calculated as: N = 1.3 × 16 ≈ 26.

[0081] Example 5

[0082] The application of the ball shell knot temporary plugging agent was used to carry out temporary plugging and fracturing in a tight sandstone reservoir well 46-48#. The target reservoir of the well was perforated with 89 guns and 89 bullets, with a total perforation of 3m, a hole density of 16 holes / meter, and a total of 48 perforated holes, of which 32 perforated holes were to be plugged, and 5 1 / 2 casing fracturing, operation displacement is 8m 3 / min, the specific steps are as follows:

[0083] S1. Select a spherical shell knot temporary plugging agent that matches the hole size according to the perforating gun type, bullet type and other perforating hole parameters;

[0084] S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion;

[0085] S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction;

[0086] S4. Perform pre-temporary plugging fracturing according to the construction pumping procedure. After completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid to reduce the displacement to 3m 3 / min, open the stopcock of the lower stopcock valve, release the spherical shell rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid to deliver the spherical shell rope knot temporary plugging agent to the blasthole;

[0087] S5. Measure the displacement pumping liquid volume to reach 1 wellbore volume. After the ball shell knot temporarily blocks the ball in place, the pressure rises by 2.0MPa (refer to Figure 5 );

[0088] S6, after the ball shell type knot temporary plugging agent is in place, the discharge volume is increased to 8m before temporary plugging 3 / min construction displacement, enter the next step of normal construction procedure.

[0089] Preferably, in step S1, the size of the spherical shell type knot temporary plugging agent is matched with the size of the perforation hole and selected to be plugged by using a spherical shell type knot temporary plugging agent of 18-20 mm.

[0090] Preferably, the amount of spherical shell knot temporary plugging agent in step S2 is calculated as: N = 1.3 × 32 ≈ 42.

[0091] Comparative Example

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for using a spherical shell knot temporary plugging agent for fracturing, characterized in that: The following steps are involved: S1. Selecting a spherical shell knot temporary plugging agent that matches the hole size according to the perforation hole parameters; S2. According to the number of perforation holes to be plugged in the target reservoir section, prepare a number of spherical shell knot temporary plugging agents in step S1 in proportion; S3, pre-placing the spherical shell knot temporary plugging agent in step S2 into the plug valve of the fracturing wellhead pipeline, and the plug valve is in a closed state during the fracturing construction; S4, perform pre-temporary plugging fracturing construction according to the construction pumping procedure, after completing the pre-temporary plugging sanding construction, inject a wellbore volume displacement fluid, reduce the displacement, open the plug of the lower plug valve, release the spherical shell type rope knot temporary plugging agent preset in step S3, keep the displacement stable, and pump the displacement fluid and the spherical shell type rope knot temporary plugging agent to the blasthole; S5. Measure the amount of liquid delivered by the displacement pump, observe and record the pressure increase of the spherical shell type knot temporary plugging agent.

2. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: The following steps are also included: S6. After the spherical shell type knot temporary plugging agent is in place, the displacement is increased to the construction displacement before temporary plugging, and the next step of normal construction procedure is entered.

3. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 73 gun-73 bullet perforation, using a temporary plugging with a diameter of 16-18mm.

4. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 89 guns-89 bullets perforation, using a temporary plugging with a diameter of 18-20mm.

5. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: The size of the spherical shell knot temporary plugging agent is matched with the size of the perforating blasthole: 102 gun-127 bullet perforation, using a temporary plugging with a diameter of 20-22mm.

6. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: Calculation of the number of spherical shell type knot temporary plugging agents: N = (1.1-1.3) × n, where N represents the number of spherical shell type knot temporary plugging agents; n represents the number of perforation holes to be temporarily plugged.

7. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: In step S4, the displacement is reduced to 3m 3 / min.

8. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: In step S5, the displacement pumping liquid volume is measured to reach one wellbore volume, and the pressure increase of the spherical shell type knot temporary plugging agent is observed and recorded.

9. The method for using the spherical shell knot temporary plugging agent for fracturing according to claim 1, characterized in that: In step S1, a spherical shell knot temporary plugging agent matching the hole size is selected according to the perforating gun type, bullet type and other perforating hole parameters.

10. An application of the method for using the spherical shell knot temporary plugging agent for fracturing as claimed in any one of claims 1 to 9 in temporary plugging and diversion fracturing construction.

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