Rapid profile control and water injection integrated tubular column suitable for medium-high permeability fractured reservoir and profile control method of rapid profile control and water injection integrated tubular column

Abstract

The invention belongs to the technical field of oil-gas field development and recovery efficiency improvement, and discloses a rapid profile control and water injection integrated tubular column suitable for medium-high permeability fractured reservoirs and a profile control method thereof. The profile control and water injection integrated tubular column is adopted, and water injection is directly conducted without replacing the tubular column after profile control; a large-aperture profile control device is adopted, and the shearing effect is reduced when the high-concentration plugging agent is injected in a large-displacement mode; and the fracturing truck group and the conventional profile control liquid preparation equipment are matched for use, so that the rapid injection capacity of the high-concentration plugging agent is improved. Two wells are implemented on site, the composite particle slug construction displacement is increased to 1.0 m < 3 > / min from conventional profile control 0.1 m < 3 > / min, the conventional profile control particle concentration is 0.3-0.5 wt%, the rapid profile control particle concentration is 8-17 wt%, the profile control construction period is shortened to 3-5 days from 15-25 days of conventional profile control, cracks can be effectively plugged through high-concentration, large-dosage and plugging agent multi-slug combination and rapid injection optimized profile control, and the profile control efficiency is improved. After the profile control, the water injection pressure is averagely increased by 1.8 MPa, the water absorption profile of the profile control layer is obviously improved, the average daily oil increase of a well group within the period of validity is 0.64 t, and the period of validity exceeds 8 months.

Description

Technical Field

[0001] The invention belongs to the technical field of improving oil and gas field recovery, and relates to a rapid profile control method for crack-type crossflow problems in medium- and high-permeability old areas, and specifically relates to a rapid profile control and water injection integrated pipe string suitable for medium- and high-permeability fractured oil reservoirs and a profile control method thereof. Background Art

[0002] After the water drive development of the old high permeability area entered the double high / three high development stage, artificial fractures, natural fractures, and water injection induced fractures further developed and fracture-type crossflow occurred. The identification characteristics are fracture-type water flooding in the connected wells, tracers and injection-production relationships show that the fracture development direction is advancing, and the plane contradiction is prominent; the pressure drop test well interpretation shows the presence of diversion fractures, and the test data of water absorption / liquid production profiles and self-absorption water show that the fracture development layer has strong absorption, and the contradictions within and between the upper layers in the vertical direction are obvious.

[0003] The general profile control design is restricted by the process, mainly low concentration of plugging agent (granules + gel), low displacement (1-6m 3 / h) injection; first, the plugging agent cannot form effective accumulation in the fracture, and second, the deep migration ability of the plugging agent is weak. Therefore, it is necessary to improve the process level and optimize the engineering design parameters to achieve the improvement of the deep migration ability of the plugging agent and the fracture plugging ability. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the present invention aims to provide a rapid profile control design method suitable for medium- and high-permeability fractured oil reservoirs.

[0005] The technical solution of the present invention is as follows:

[0006] The invention discloses a rapid profile control and water injection integrated pipe string suitable for medium-high permeability fractured oil reservoirs. An eccentric water distributor and a Y-type packer are alternately connected to the constant pressure oil pipe in sequence, and a profile control device is connected to the pipe between the eccentric water distributor and the Y-type packer.

[0007] Furthermore, the profile controller has a large aperture, with an aperture size of 1-2 cm.

[0008] Furthermore, the model of the Y-type packer is Y341-110KXJ.

[0009] Furthermore, the model of the eccentric water distributor is PX-110.

[0010] A rapid profile control and water injection system suitable for medium- and high-permeability fractured oil reservoirs, wherein an ejector is sequentially connected to a liquid distribution tank B and a liquid distribution tank A through pipelines, a profile control pump is connected to the pipeline between the liquid distribution tank and the water injection well, and a fracturing vehicle group and a sand adding vehicle are also connected to the pipeline between the liquid distribution tank and the water injection well.

[0011] A rapid profile control method applicable to medium- and high-permeability fractured oil reservoirs comprises the following steps:

[0012] In the first step, 10 to 20 m of water is injected into the wellbore and oil layer. 3 , 0.15%wt thickening polymer solution, displacement 1m 3 / min;

[0013] In the second step, the target layer is injected with 15m 3 Isolation fluid and high-strength quick-setting gel 0.5 times the crack volume, displacement 0.6m 3 / min; after 2 hours of waiting for solidification, the target layer is injected with composite particles of one times the crack volume, with a particle concentration of 8-17%. The organic phenolic gel carries the composite particles at a rate of 1.0m 3 / min displacement injection; after the particle injection is completed, 5 to 10 cubic meters of displacement fluid are injected, with a displacement of 0.6m 3 / min, wait for 48h after injection;

[0014] The third step is to inject organic phenolic gel. The injection volume is designed to be 20-30m according to the thickness of the oil layer. 3 / m, displacement 0.13m 3 / min;

[0015] Step 4: Inject 10-20m 3 High-strength quick-setting gel, displacement 0.13m 3 / min;

[0016] Step 5: Inject 15m 3 Displacement fluid, displacement 0.13m 3 / min, wait for 72 hours after injection, and resume normal water injection after the waiting time is over.

[0017] Furthermore, the model of the thickening type surfactant is DQLHJBJ-1.

[0018] Furthermore, the isolation liquid is a 0.2wt% polyacrylamide solution with a molecular weight of 25 million.

[0019] Furthermore, the model of the high-strength quick-setting gel is YQY-SLLJ.

[0020] Furthermore, the composite particles are m 橡胶颗粒 :m 缓膨颗粒 =4:1.

[0021] Furthermore, the displacement fluid is a 0.2 wt % polyacrylamide solution with a molecular weight of 25 million.

[0022] The beneficial effects of the present invention compared with the prior art are:

[0023] First, large-volume, high-concentration injection is used to achieve the migration of plugging agents in the formation and effective accumulation in fractures; second, the pipe column and equipment are optimized to provide process and equipment support for large-volume, high-concentration injection. Compared with conventional profile control methods, the present invention can enable deep migration of plugging agents in the formation, more effectively alleviate intra-layer, inter-layer, and plane conflicts, achieve the purpose of stabilizing oil and controlling water, and realize the management of invalid water circulation in old oil fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the mechanism of rapid profile adjustment and crack plugging;

[0025] Figure 2 It is a schematic diagram of the structure of the integrated pipe string for rapid profile control and water injection;

[0026] Figure 3 This is a schematic diagram of the equipment layout at the construction site.

[0027] Among them, 1. Pressure regulator tubing, 2. Y-type packer, 3. Eccentric water distributor, 4. Bottom valve, 5. Profile control device, 6. Ejector, 7. Liquid distribution tank A, 8. Liquid distribution tank B, 9. Profile control pump, 10. Fracturing vehicle group, 11. Sand adding vehicle, 12. Pressure flow meter, 13. Water injection well. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with specific drawings and examples. The examples described below are only preferred embodiments of the present invention. It should be noted that the following description is only for the purpose of explaining the present invention and is not intended to limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the embodiments according to the technical essence of the present invention are within the scope of the technical solution of the present invention. In the following examples, the materials, reagents, etc. used are obtained from commercial sources unless otherwise specified.

[0029] The present invention is optimized in the following three aspects:

[0030] 1. Equipment combination optimization:

[0031] (1) Use an integrated profile control and water injection string, and inject water directly without changing the string after adjustment;

[0032] (2) Using a large-aperture profile control device, the shear effect is reduced when a high-concentration plugging agent is injected in large volumes;

[0033] (3) Use a fracturing vehicle group and conventional profile control and fluid preparation equipment in combination to improve the ability to quickly inject high-concentration plugging agents.

[0034] 2. Slug design optimization:

[0035] (1) Pre-fluid plug: Viscosity-enhancing polymer surface agent (model: DQLHJBJ-1) reduces particle wellbore deposition and acts as a spacer fluid to prevent formation water from diluting the plugging agent and reducing the concentration of the plugging agent;

[0036] (2) Crack plugging segment plug: High-strength quick-setting gel (model: YQY-SLLJ) and organic phenolic gel (model: YQY-FQDJ-Ⅲ) carry high-concentration composite particles. The fracturing vehicle group can realize rapid injection construction. Rapid injection of plugging agents can effectively plug cracks.

[0037] (3) High permeability strip plugging: organic phenolic gel (model: YQY-FQDJ-Ⅲ), injected at a conventional displacement using conventional profile control equipment;

[0038] (4) Near-wellbore large pore plugging segment: high-strength quick-setting gel (model: YQY-SLLJ), conventional profile control equipment and displacement injection to strongly plug the near-wellbore area;

[0039] (5) Displacement plug: polymer (molecular weight 25 million HPAM), conventional profile control equipment and displacement injection, plays the role of displacing and isolating formation water.

[0040] 3. Construction process optimization:

[0041] In the first step, 10 to 20 m of water is injected into the wellbore and oil layer. 3 , 0.15%wt thickening polymer solution, displacement 1m 3 / min;

[0042] In the second step, the target layer is injected with 15m 3 Spacer fluid (0.2wt% polyacrylamide solution, molecular weight 25 million) and high-strength quick-setting gel of 0.5 times the crack volume, displacement 0.6m 3 / min; after 2 hours of solidification, the target layer is injected with composite particles (m 橡胶颗粒 :m 缓膨颗粒 =4:1), the particle concentration is 8-17%, the organic phenolic gel carries the composite particles at 1.0m 3 / min displacement injection; after the particle injection is completed, 5 to 10 cubic meters of displacement fluid (0.2% polyacrylamide solution, molecular weight 25 million) is injected, with a displacement of 0.6m 3 / min, wait for 48h after injection;

[0043] The third step is to inject organic phenolic gel. The injection volume is designed to be 20-30m according to the thickness of the oil layer. 3 / m, displacement 0.13m 3 / min;

[0044] Step 4: Inject 10-20m 3High-strength quick-setting gel, displacement 0.13m 3 / min;

[0045] Step 5: Inject 15m 3 Displacement fluid (0.2% polyacrylamide solution, molecular weight 25 million), displacement 0.13m 3 / min, wait for 72 hours after injection, and resume normal water injection after the waiting time is over.

[0046] Example 1

[0047] The implementation process of single-layer rapid profile control of a water injection well in an oil field is as follows:

[0048] (1) Use a fracturing vehicle group to inject, cycle pressure test, fill the wellbore, test squeeze, and inject 15m 3 , 0.15%wt thickening polymer solution, displacement 1m 3 / min.

[0049] (2) Use a fracturing vehicle to inject 15m into the target layer. 3 Spacer (0.2% polyacrylamide solution, molecular weight 25 million) and 8m 3 Quick-setting gel, displacement 0.6m 3 / min; after 2h of waiting for solidification, the target layer is injected with 16m 3 Composite particles (m 橡胶颗粒 :m 缓膨颗粒 =4:1), the particle concentration is low at first and then high, ranging from 8 to 17%, and the organic phenolic gel carries particles at a concentration of 1.0 m 3 / min displacement injection; after the particle injection is completed, inject 10m 3 Displacement fluid (0.2% polyacrylamide solution, molecular weight 25 million), displacement 0.6m 3 / min, wait for 48h after injection.

[0050] (3) Use profile control pump injection to inject organic phenolic gel. The injection volume is designed to be 20-30m according to the thickness of the oil layer. 3 / m, the layer thickness is 12m, and 280m of organic phenolic gel is injected 3 , displacement 0.13m 3 / min.

[0051] (4) Use profile control pump injection to inject 15m 3 High-strength quick-setting gel, displacement 0.13m 3 / min.

[0052] (5) Use profile control pump injection to inject 15m 3 Displacement fluid (0.2% polyacrylamide solution, molecular weight 25 million), displacement 0.13m3 / min, wait for 72 hours after injection, and resume normal water injection after the waiting time is over.

[0053] Two wells were drilled on site, and the displacement of composite particle slug construction was increased from conventional profile control 0.1m 3 / min increased to 1.0m 3 / min, the conventional profile control particle concentration is 0.3-0.5wt%, the rapid profile control particle concentration is 8-17wt%, the profile control period is shortened from 15-25 days of conventional profile control to 3-5 days, and the high concentration, large dose, multi-stage plugging agent combination and rapid injection optimization profile control can achieve effective plugging of fractures. After the adjustment, the water injection pressure increases by an average of 1.8MPa, and the water absorption profile of the profile control layer is significantly improved. During the effective period, the average daily oil production of the well group is 0.64t, and the effective period exceeds 8 months.

[0054] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A rapid profile control and water injection integrated pipe string suitable for medium-high permeability fractured oil reservoirs, wherein an eccentric water distributor (3) and a Y-type packer (2) are alternately connected to a constant pressure oil pipe (1), characterized in that: A profile control device (5) is connected to the pipeline between the eccentric water distributor (3) and the Y-type packer (2).

2. The rapid profile control and water injection integrated pipe string suitable for medium- and high-permeability fractured oil reservoirs according to claim 1, characterized in that: The profile controller (5) has a large aperture, with an aperture size of 1-2 cm.

3. The rapid profile control and water injection integrated pipe string suitable for medium- and high-permeability fractured oil reservoirs according to claim 1, characterized in that: The model of the Y-type packer (2) is Y341-110KXJ.

4. The rapid profile control and water injection integrated pipe string suitable for medium- and high-permeability fractured oil reservoirs according to claim 1, characterized in that: The model of the eccentric water distributor (3) is PX-110.

5. A rapid profile control and water injection system suitable for medium-high permeability fractured oil reservoirs, wherein the ejector (6) is connected to the liquid preparation tank B (8) and the liquid preparation tank A (7) in sequence through pipelines, and the pipeline between the liquid preparation tank and the water injection well (13) is connected to a profile control pump (9), characterized in that: The pipeline between the liquid preparation tank and the water injection well (13) is also connected to a fracturing vehicle group (10) and a sand adding vehicle (11).

6. A rapid profile control method suitable for medium- and high-permeability fractured oil reservoirs, characterized in that: The following steps are involved: In the first step, 10 to 20 m of water is injected into the wellbore and oil layer. 3 , 0.15%wt thickening polymer solution, displacement 1m 3 / min; In the second step, the target layer is injected with 15m 3 Isolation fluid and high-strength quick-setting gel 0.5 times the crack volume, displacement 0.6m 3 / min; after 2 hours of waiting for solidification, the target layer is injected with composite particles of one times the crack volume, with a particle concentration of 8-17%. The organic phenolic gel carries the composite particles at a rate of 1.0m 3 / min displacement injection; after the particle injection is completed, 5 to 10 cubic meters of displacement fluid are injected, with a displacement of 0.6m 3 / min, wait for 48h after injection; The third step is to inject organic phenolic gel. The injection volume is designed to be 20-30m according to the thickness of the oil layer. 3 / m, displacement 0.13m 3 / min; Step 4: Inject 10-20m 3 High strength quick-setting gel, displacement 0.13m 3 / min; Step 5: Inject 15m 3 Displacement fluid, displacement 0.13m 3 / min, wait for 72 hours after injection, and resume normal water injection after the waiting time is over.

7. The rapid profile control method applicable to medium- and high-permeability fractured oil reservoirs according to claim 6, characterized in that: The model of the thickening type surface active agent is DQLHJBJ-1.

8. The rapid profile control method applicable to medium- and high-permeability fractured oil reservoirs according to claim 6, characterized in that: The isolation liquid and the displacement liquid are both 0.2wt% polyacrylamide solution with a molecular weight of 25 million.

9. The rapid profile control method applicable to medium- and high-permeability fractured oil reservoirs according to claim 6, characterized in that: The model of the high-strength quick-setting gel is YQY-SLLJ.

10. The rapid profile control method applicable to medium- and high-permeability fractured oil reservoirs according to claim 6, characterized in that: The composite particles are m 橡胶颗粒 :m 缓膨颗粒 =4:1.

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