CN113565483B - Expansion body and conglomerate reservoir reconstruction method - Google Patents
Expansion body and conglomerate reservoir reconstruction method Download PDFInfo
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- CN113565483B CN113565483B CN202010358234.9A CN202010358234A CN113565483B CN 113565483 B CN113565483 B CN 113565483B CN 202010358234 A CN202010358234 A CN 202010358234A CN 113565483 B CN113565483 B CN 113565483B
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- inner layer
- expansion body
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 32
- 239000012530 fluid Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000008961 swelling Effects 0.000 claims description 8
- 229920006267 polyester film Polymers 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002407 reforming Methods 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000006703 hydration reaction Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 238000009420 retrofitting Methods 0.000 claims description 3
- 230000004308 accommodation Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The application provides an expansion body and a conglomerate reservoir reconstruction method. Wherein, the inflation body includes: a deformable outer layer; the deformable inner layer is arranged in the deformable outer layer, and the deformable inner layer is internally provided with a containing cavity; and the expanding agent is arranged in the accommodating cavity. The technical scheme of the application effectively solves the problem of poor hydraulic fracturing effect in the related technology.
Description
Technical Field
The application relates to the field of petroleum engineering, in particular to an expansion body and conglomerate reservoir reconstruction method.
Background
With the progress of technology and the development of age, the demand for energy resources represented by petroleum at home and abroad is increasing. The conglomerate reservoir is used as one of important storage media of the oil and gas reservoir, and has important development value and research significance.
Hydraulic fracturing has found wide application as an efficient means of reservoir exploitation. In the related art, hydraulic fracturing is applied to the exploitation of a conglomerate reservoir, and the form and the behavior of the hydraulic fracturing greatly influence the fracturing effect and the oil and gas yield. In addition to the behavior of detritus and gravel penetration in a conglomerate reservoir, hydraulic fractures can also be prevented when larger gravels are encountered, resulting in an undesirable hydraulic fracturing effect.
Disclosure of Invention
The application mainly aims to provide an expansion body and conglomerate reservoir transformation method for solving the problem of poor hydraulic fracturing effect in the related art.
In order to achieve the above object, according to one aspect of the present application, there is provided an expansion body comprising: a deformable outer layer; the deformable inner layer is arranged in the deformable outer layer, and the deformable inner layer is internally provided with a containing cavity; and the expanding agent is arranged in the accommodating cavity.
Further, the deformable outer layer is made of rubber, and the deformable inner layer is made of polyester film.
Further, the main components of the expanding agent are calcium oxide and a catalyst.
Further, the expansion body further comprises water arranged in the accommodating cavity, and the mass ratio of the expansion agent to the water is 11:2.
further, the expansion body is a deformable sphere.
According to another aspect of the present application, there is provided a method of reforming a conglomerate reservoir, using the expansion body described above, the method comprising the steps of: step S10: forming an initial fracture in the formation and injecting a proppant; step S20: manufacturing an expansion body; step S30: mixing a plurality of expansion bodies into a first fracturing fluid and injecting the first fracturing fluid into an initial fracture; step S40: the hydration reaction takes place for a predetermined time inside the swelling body, swells and proppes up the initial fracture, forming a new fracture.
Further, in step S20, the manufacturing of the expansion body includes the steps of: a deformable inner layer is made of a polyester film and forms a containing cavity, and an injection port is arranged on the deformable inner layer; mixing the expanding agent and water, and injecting the mixture into the accommodating body through the injection port; the deformable inner layer is placed in the heated liquid rubber and the liquid rubber is formed into a deformable outer layer surrounding the deformable inner layer.
Further, in step S10, an initial fracture is formed by fracturing with a second fracturing fluid, a proppant is mixed into the second fracturing fluid, and in step S30, the volume ratio of the expansion body to the first fracturing fluid is 1:9.
Further, the predetermined time is between 6 hours and 15 hours.
Further, portions of the plurality of expansion bodies abut a fracture wall of the initial fracture.
By applying the technical scheme of the application, the expansion body comprises the deformable inner layer and the deformable outer layer, a containing cavity is formed in the deformable inner layer, and the expansion agent is filled in the containing cavity, so that the volume of the expansion body can be increased when the expansion agent begins to expand. When an expansion body is placed in the fracture, the volume increase of the expansion body can prop up the fracture, causing the fracture to further increase. Therefore, the technical scheme of the application effectively solves the problem of poor hydraulic fracturing effect in the related technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 shows a schematic cross-sectional view of an embodiment of an expansion body according to the application;
FIG. 2 shows a schematic cross-sectional view of the expansion body of FIG. 1 in a compressed state;
FIG. 3 shows a schematic cross-sectional view of the expansion body of FIG. 1 in a fracture; and
fig. 4 shows a schematic flow diagram of an embodiment of a conglomerate reservoir retrofitting method according to the present application.
Wherein the above figures include the following reference numerals:
1. an expansion body; 10. a deformable outer layer; 20. a deformable inner layer; 30. an expanding agent; 40. initial cracking; 41. new cracks.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1 and 2, in the present embodiment, the expansion body includes: a deformable outer layer 10, a deformable inner layer 20, and an expanding agent 30. The deformable inner layer 20 is arranged inside the deformable outer layer 10, and the deformable inner layer 20 is internally provided with a containing cavity; an expanding agent 30 is disposed in the receiving chamber.
By applying the technical solution of the present embodiment, the expansion body 1 includes the deformable inner layer 20 and the deformable outer layer 10, a containing cavity is formed inside the deformable inner layer 20, and the expansion agent 30 is contained in the containing cavity, and when the expansion agent 30 begins to expand, the volume of the expansion body 1 can be increased. When the expansion body 1 is placed in the fracture, the volume increase of the expansion body 1 can prop up the fracture, so that the fracture further increases. Therefore, the technical scheme of the embodiment effectively solves the problem of poor hydraulic fracturing effect in the related technology.
As shown in fig. 1 and 2, in the present embodiment, the deformable outer layer 10 is made of rubber, and the deformable inner layer 20 is made of a polyester film. The polyester film has good heat shrinkage and heat resistance, can prevent the swelling agent 30 of the deformable inner layer 20 from contacting with rubber, has good tensile properties, and has a large friction coefficient and is not easy to slip. The material has good sealing performance, and can be isolated from the outside after the mixture of the expanding agent 30 and water is placed in the material, so that other liquid is prevented from entering the expanding body 1, and the expanding effect is prevented from being influenced.
In this embodiment, the main components of the expanding agent are calcium oxide and a catalyst. The calcium oxide can expand under the action of the catalyst, so that the volume is increased. And the reaction period of the expanding agent is controllable, so that a worker can predict the cracking condition of the crack.
In this embodiment, the expansion body 1 further comprises water disposed in the accommodation chamber, and the mass ratio of the expansion agent to the water is 11:2. the above ratio allows the expansion effect of the expansion body 1 to be optimized, but a ratio similar to the above ratio can also allow the expansion body 1 to be expanded, for example 4:1,5:1, etc.
As shown in fig. 1 and 2, in the present embodiment, the expansion body 1 is a deformable sphere. In general, when the expansion body 1 is used, a plurality of expansion bodies 1 are contacted with each other, and the deformable sphere can reduce the gaps between a plurality of expansion bodies 1, so that the expansion propping effect is better.
In an embodiment not shown in the drawings, the expansion body may be provided in other shapes, such as a cone, a cuboid, etc., according to the actual situation on site, so as to optimize the expansion propping effect.
According to another aspect of the present embodiment, there is provided a method for reforming a conglomerate reservoir, as shown in fig. 4, using the expansion body 1 described above, the method comprising the steps of:
step S10: forming an initial fracture 40 in the formation and injecting a proppant;
step S20: manufacturing an expansion body 1;
step S30: mixing a plurality of expansion bodies 1 into a first fracturing fluid and injecting the first fracturing fluid into an initial fracture 40;
step S40: the hydration reaction occurs for a predetermined time inside the swelling body 1, swells and props up the initial fracture 40, and forms a new fracture 41.
By injecting the expansion body 1 into the fracture with the first fracturing fluid through the above steps, the expansion body 1 can aggregate in the fracture, after a predetermined time, the expansion body begins to expand, the initial fracture 40 begins to prop up, and a new fracture 41 is formed. When the hydraulic fracturing effect is poor, the method can be used for expanding the fracture, so that the expansion body 1 is convenient to transmit in the initial fracture 40. At the same time, since the expansion body 1 is deformable, the expansion body 1 is more convenient to transport in the initial fracture 40.
As shown in fig. 3, in the present embodiment, mainly for the conglomerate reservoir fracture, hydraulic fracturing is first performed to mine the conglomerate reservoir; when the hydraulic fracture encounters larger gravel and the fracture stopping phenomenon or the fracturing effect is not ideal, the propping agent is injected, and then the expanding agent 30 is used for fracture end fracturing. Wherein the expansion agent 30 is formulated at the ground surface and further loaded into the receiving chamber to complete the manufacture of the expansion body 1. The expansion body 1 is injected into the stratum along with the first fracturing fluid and is accumulated at the tip of the initial fracture 40, the volume of the expansion body 1 is increased continuously along with the reaction of the expanding agent 30, and a large expansion force is generated by the interaction between the expansion bodies 1 to act on the fracture walls of the initial fracture 40, so that the fracture penetrates through the gravel to form a new fracture 41. Through alternate hydraulic fracturing and fracturing of the expansion body 1, a conglomerate reservoir is effectively transformed, and oil and gas recovery efficiency is improved. And the expanding agent 30 generates pressure by itself, no additional pressure is required to be continuously provided on site, and thus the production cost can be reduced.
In this embodiment (not shown in the drawings), in step S20, the production of the inflation body includes the steps of: the deformable inner layer 20 is made of polyester film and forms a containing cavity, and an injection port is arranged on the deformable inner layer; mixing the swelling agent 30 and water and injecting the mixture into the accommodating chamber through the injection port; the deformable inner layer 20 is placed in the heated liquid rubber and the liquid rubber is formed into the deformable outer layer 10 that surrounds the deformable inner layer 20. The deformable inner layer 20 can effectively contain the mixture of the expanding agent 30 and water, is not easy to spill, has good heat resistance, can prevent the expanding agent 30 from being in direct contact with the heated liquid rubber, and avoids the condition that the expanding agent 30 fails or the reaction speed is accelerated. The deformable inner layer 20 is directly placed in the liquid rubber, and the liquid rubber does not enter the deformable inner layer 20 to contact the swelling agent 30 because the opening of the deformable inner layer 20 is small.
Of course, in other embodiments, a structure such as a clip may be provided to seal the inlet of the mylar film, and the clip may be used to close the inlet.
In this embodiment, in step S10, an initial fracture 40 is formed in a fracturing manner by a second fracturing fluid into which a proppant is mixed. The propping agent can effectively prop the cracks and prevent the cracks from closing.
In this embodiment (not shown in the figure), in step S30, the volume ratio of the expansion body 1 to the first fracturing fluid is 1:9, and the injection is stopped after the plurality of expansion bodies 1 are gathered at the tip of the initial fracture 40. When the first fracturing fluid is injected, it is injected at a greater rate of injection, facilitating the flow of the expansion body 1 through the initiation fracture 40 to the tip of the initiation fracture 40. The judgment basis of stopping injection is that the volume of the second fracturing fluid is the same as that of the first fracturing fluid, and when the second fracturing fluid is injected for 500m 3 Then the first fracturing fluid is injected into the well for 500m 3 The volume of the expansion body 1 in the first fracturing fluid is 45m 3 . Of course, the volume ratio of the expansion body 1 to the first fracturing fluid is 1:7 to 1: all can be implemented between 12The expansion body 1 now propped up the crack.
In this embodiment, the predetermined time is between 6 hours and 15 hours. The predetermined time may set aside a preparation time for the worker, with which the expansion body 1 may be manufactured and the first fracturing fluid injected into the fracture. When the expanding agent and water undergo hydration reaction, the expansion bodies 1 undergo volume expansion, the expansion force between each expansion body 1 is continuously increased, and the expansion bodies 1 can be aggregated into a whole due to the fact that the friction force between the expansion bodies is large, so that expansion resultant force is conveniently generated, the expansion resultant force of the front end of the initial crack 40 acting on the crack wall is continuously increased, and the initial crack is further promoted to slowly expand forwards, so that the gravel passes through.
As shown in fig. 3, in the present embodiment, portions of the plurality of expansion bodies 1 abut against the fracture walls of the initial fracture 40. The abutment can make the contact of the expansion body 1 with the crack wall tighter, and then make the effect of the expansion body propping better, make the new crack 41 bigger to meet the demand.
In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. A method of conglomerate reservoir modification, characterized in that it comprises the steps of:
step S10: forming an initial fracture (40) in the formation and injecting a proppant;
step S20: manufacturing an expansion body (1);
step S30: mixing a plurality of expansion bodies (1) into a first fracturing fluid and injecting the first fracturing fluid into an initial fracture (40), so that parts of the expansion bodies (1) are abutted against fracture walls of the initial fracture (40);
step S40: causing hydration reaction to occur for a predetermined time inside the swelling body (1), swelling and propping up the initial fracture (40) to form a new fracture (41);
wherein the expansion body (1) comprises: a deformable outer layer (10); a deformable inner layer (20), the deformable inner layer (20) being arranged inside the deformable outer layer (10), the deformable inner layer (20) having an accommodation cavity inside; an expanding agent (30) disposed in the accommodating chamber; the deformable outer layer (10) is made of rubber, and the deformable inner layer (20) is made of polyester film; the expansion body (1) further comprises water arranged in the accommodating cavity, and the mass ratio of the expansion agent (30) to the water is 11:2;
in the step S10, the initial fracture (40) is formed in a fracturing manner by a second fracturing fluid into which the proppants are mixed;
in the step S30, the injection is stopped after the plurality of expansion bodies (1) are gathered at the tip of the initial fracture (40), and when the first fracturing fluid is injected, the expansion bodies (1) flow to the tip of the initial fracture (40) through the initial fracture (40), and the judgment of stopping the injection is that the volume of the second fracturing fluid is the same as the volume of the first fracturing fluid.
2. The conglomerate reservoir reforming method according to claim 1, characterized in that in said step S20, the production of the expansion body (1) comprises the steps of:
a deformable inner layer (20) is made of a polyester film and forms the accommodating cavity, and an injection port is arranged on the deformable inner layer (20);
injecting an expanding agent (30) and water into the accommodating cavity through the injection port after mixing;
the deformable inner layer (20) is placed in a heated liquid rubber and the liquid rubber is formed into a deformable outer layer (10) surrounding the deformable inner layer (20).
3. The conglomerate reservoir reforming method according to claim 1, characterized in that in step S30, the volume ratio of the expansion body (1) to the first fracturing fluid is 1:9.
4. The conglomerate reservoir retrofitting method of claim 1, wherein said predetermined time is between 6 hours and 15 hours.
5. The conglomerate reservoir reforming method according to claim 1, characterized in that the composition of the swelling agent (30) comprises calcium oxide and a catalyst.
6. A conglomerate reservoir retrofitting method according to claim 1, characterized in that said expansion body (1) is a deformable sphere.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010358234.9A CN113565483B (en) | 2020-04-29 | 2020-04-29 | Expansion body and conglomerate reservoir reconstruction method |
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| CN202010358234.9A CN113565483B (en) | 2020-04-29 | 2020-04-29 | Expansion body and conglomerate reservoir reconstruction method |
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| CN113565483B true CN113565483B (en) | 2023-10-27 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120190597A1 (en) * | 2011-01-25 | 2012-07-26 | Oxane Materials, Inc. | Extrusion Process For Proppant Production |
| WO2014014633A1 (en) * | 2012-07-20 | 2014-01-23 | Halliburton Energy Services, Inc. | Use of expandable self-removing filler material in fracturing operations |
| US20140262295A1 (en) * | 2013-03-14 | 2014-09-18 | Lawrence Livermore National Security, Llc | Encapsulated proppants |
| US20160208161A1 (en) * | 2013-09-27 | 2016-07-21 | Halliburton Energy Services, Inc. | Expandable Particulates and Methods of Use and Preparation |
| CN107313762A (en) * | 2016-04-26 | 2017-11-03 | 中国石油化工股份有限公司 | A kind of shale hydraulic fracturing method |
-
2020
- 2020-04-29 CN CN202010358234.9A patent/CN113565483B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120190597A1 (en) * | 2011-01-25 | 2012-07-26 | Oxane Materials, Inc. | Extrusion Process For Proppant Production |
| WO2014014633A1 (en) * | 2012-07-20 | 2014-01-23 | Halliburton Energy Services, Inc. | Use of expandable self-removing filler material in fracturing operations |
| US20140262295A1 (en) * | 2013-03-14 | 2014-09-18 | Lawrence Livermore National Security, Llc | Encapsulated proppants |
| US20160208161A1 (en) * | 2013-09-27 | 2016-07-21 | Halliburton Energy Services, Inc. | Expandable Particulates and Methods of Use and Preparation |
| CN107313762A (en) * | 2016-04-26 | 2017-11-03 | 中国石油化工股份有限公司 | A kind of shale hydraulic fracturing method |
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