CN109488251B - Mechanism for presetting dissolution medium and use method - Google Patents
Mechanism for presetting dissolution medium and use method Download PDFInfo
- Publication number
- CN109488251B CN109488251B CN201811382247.9A CN201811382247A CN109488251B CN 109488251 B CN109488251 B CN 109488251B CN 201811382247 A CN201811382247 A CN 201811382247A CN 109488251 B CN109488251 B CN 109488251B
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- central tube
- dissolution medium
- sealing
- preset
- side wall
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- 230000007246 mechanism Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000012738 dissolution medium Substances 0.000 title claims description 26
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 4
- 239000002609 medium Substances 0.000 claims description 24
- 238000012856 packing Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 4
- 239000002195 soluble material Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 8
- 238000005553 drilling Methods 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention provides a mechanism for presetting a dissolving medium and a use method thereof. The central tube is a reducer tube with a small upper part and a large lower part, and a ball seat is arranged in the central tube. The body is two sections of annular pipes with equal outer diameters and unequal inner diameters, sealing screws are arranged at the top of the body, shear nails are symmetrically arranged at the upper end of the body and connected with the central pipe, sealing rings are respectively arranged at the upper part and the lower part of the body, and the positions of the shear nails are higher than the ball seats of the central pipe. The preset dissolving medium mechanism provided by the invention is provided with the opening device aiming at the dissolvable sealing tool (such as a dissolvable bridge plug), so that the working time of the sealing tool can be prolonged while the normal work of a ball seat is not influenced, and after the body is opened, the built-in dissolving medium is released, so that the quick automatic dissolution of the dissolvable sealing tool is realized, and the control of the dissolving time of the dissolvable sealing tool is realized.
Description
Technical Field
The invention belongs to the technical field of multi-layer section transformation of oil and gas field reservoirs, and particularly relates to a mechanism for presetting a dissolution medium and a use method thereof.
Background
The multi-layer multi-section reservoir reconstruction multipurpose quick drilling bridge plug staged fracturing process for the tight oil and gas reservoir horizontal well has the advantages of reliable bridge plug packing, accurate seam distribution, accurate single-section evaluation, unrestricted staged fracturing stage number, capacity of realizing large-displacement fracturing and the like. But later stage still needs to drill out the bridge plug in the well to realize the full diameter of the sleeve and keep the integrity of the well shaft.
In recent years, on the basis of a staged fracturing process of the quick drilling bridge plug, a soluble bridge plug is derived, the quick drilling bridge plug is removed after the reservoir of the quick drilling bridge plug is transformed, the drilling risk in fracturing is reduced, the well construction period is shortened, and the operation cost is reduced.
The soluble bridge plug not only meets the pressure bearing requirement in the reservoir reconstruction process, but also meets the requirement of quickly dissolving after pressing and recovering a shaft. At present, a magnesium-aluminum alloy capable of being dissolved in chloride (sodium chloride and potassium chloride) is mainly adopted as the soluble bridge plug, and because of special dissolution conditions, the chloride solution is usually pumped from a wellhead or the dissolution conditions are established by utilizing the chloride solution in a reservoir so as to dissolve the soluble bridge plug. Pumping the chloride solution from the wellhead requires a change in process flow, which may affect fracturing fluid performance, while the soluble bridge plug is in contact with the chloride solution in the well for a longer period of time, which presents a risk to reservoir reformation operations. If the chloride solution in the reservoir is utilized, on one hand, uncertainty exists in the content of the chloride in the reservoir, and on the other hand, the dissolution time is longer, so that the construction operation efficiency is influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a preset dissolution medium mechanism and a use method thereof, which aim to open a dissolution object release channel after throwing balls to realize fixed-point and timing dissolution when a reservoir is reformed.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a preset dissolving medium mechanism, includes the center tube at least, the center tube inner wall has the block, and port pipe wall department is the ball seat on the center tube, cup joints through the shear pin in the center tube with the coaxial body of center tube, forms annular cavity between body and the center tube, body upper end lateral wall matches and sliding connection with the center tube inner wall internal diameter of block top, body lower extreme lateral wall matches and sliding connection with the block internal diameter, and the body upper surface is opened has the through-hole that runs through to annular cavity, and the through-hole upper end is provided with the sealing member.
The central tube is a reducer tube with a small inner diameter and a large inner diameter at the top, the body is of a tubular structure with a hollow cavity body, the tubular structure consists of three sections with different wall thicknesses, the outer diameter of the upper section of the body is matched with the inner diameter of the upper end of the central tube, the outer diameter of the lower section of the body is matched with the inner diameter of the side wall of the clamping table, and the length of the lower section of the body is the same as the thickness of the clamping table; annular grooves are respectively formed on the outer side walls of the upper section and the lower section of the body; the upper end face of the body is higher than the central pipe end.
The outer side wall of the upper section of the body is provided with 2-5 annular grooves, and the outer side wall of the lower section of the body is provided with 1-3 annular grooves; and 2-6 through holes are symmetrically formed.
The outer side wall of the upper section of the body is provided with 3 annular grooves, and the outer side wall of the lower section of the body is provided with 2 annular grooves; and 4 through holes are symmetrically formed.
The shear pins are symmetrically arranged.
The space between the central tube and the body is sealed by a sealing ring.
The upper end face of the body is higher than the upper end face of the ball seat by at least 10mm.
The sealing element is a sealing screw.
The body is made of a soluble material.
The use method of the preset dissolving medium mechanism comprises the steps of throwing dissolving medium into the preset dissolving medium mechanism through the through hole, and tightly covering a sealing piece at the upper end of the through hole; putting a fracturing ball into a preset dissolution medium mechanism, wherein the top end of the body is higher than a ball seat at the upper end of the central tube, so that the fracturing ball is firstly contacted with the body, and in the fracturing process, the body and the central tube relatively move under the pressure action of the fracturing ball, so that a fixing piece is sheared, and the body moves downwards along the central tube until the upper section of the body is clamped at a clamping table; the fracturing ball continues to move downwards until the fracturing ball is located on the central tube ball seat, and a fluid channel in the dissolution medium mechanism is sealed; meanwhile, an annular sealing space between the central tube and the body is opened, and a dissolving medium in the annular sealing space is released to be contacted with a soluble packing tool.
The invention has the beneficial effects that:
1. the preset dissolving medium mechanism provided by the invention is provided with a space for presetting the dissolving medium inside, so that the preset dissolving medium in the dissolvable packing tool is realized, the timing and fixed-point accurate throwing of the dissolving medium is realized, and the uncertainty of the dissolving time of the dissolvable packing tool is eliminated;
2. the preset dissolving medium mechanism provided by the invention can adopt a soluble material, can realize automatic degradation under the specific underground condition, and reduces the retention in the well.
3. The preset dissolving medium mechanism provided by the invention can be used for carrying out acid and alkali resistance treatment on the contact surface of the dissolving medium, so that the dissolving efficiency of the dissolvable sealing tool is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of the initial state of the structure of the present invention;
FIG. 2 is a schematic cross-sectional view of the structure of the present invention in operation;
FIG. 3 is a top plan view of the structure of the present invention;
fig. 4 is a schematic cross-sectional view of fig. 3.
In the figure: 1-a central tube; 2-a body; 3-seals; 4-fixing pieces; 5-clamping table; 6-ball seat; 7-through holes; 8-annular cavity.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
a mechanism for presetting a dissolution medium as shown in fig. 1-4, at least comprising a central tube 1, is characterized in that: the inner wall of the central tube 1 is provided with a clamping table 5, the pipe wall of the upper port of the central tube 1 is provided with a ball seat 6, a body 2 coaxial with the central tube 1 is sleeved in the central tube 1 through a shear pin 4, an annular cavity 8 is formed between the body 2 and the central tube 1, the side wall of the upper end of the body 2 is matched with the inner diameter of the inner wall of the central tube 1 above the clamping table 5 in a sliding manner, the side wall of the lower end of the body 2 is matched with the inner diameter of the clamping table 5 in a sliding manner, the upper surface of the body 2 is provided with a through hole 7 penetrating through the annular cavity 8, and the upper end of the through hole 7 is provided with a sealing piece 3.
In actual use, the dissolving medium is put into the preset dissolving medium mechanism through the through hole 7, and the sealing member 3 at the upper end of the through hole 7 is closed. The fracturing ball is thrown into a preset dissolution medium mechanism, and as the top end of the body 2 is higher than the ball seat 6 at the upper end of the central tube, the fracturing ball is firstly contacted with the body 2, and in the fracturing process, under the pressure action of the fracturing ball, the body 2 and the central tube 1 relatively move, so that the fixing piece 4 is sheared off, and the body moves downwards along the central tube until the upper section of the body 2 is clamped at the clamping table 5. The fracturing ball continues to move down until it seats on the base 6 of the base pipe, sealing the fluid passage in the dissolution medium mechanism. Meanwhile, an annular sealing space between the central tube and the body is opened, and a dissolving medium in the annular sealing space is released to be contacted with a soluble packing tool.
The preset dissolving medium mechanism provided by the invention is provided with a space for presetting the dissolving medium inside, so that the preset dissolving medium in the dissolvable packing tool is realized, the timing and fixed-point accurate throwing of the dissolving medium is realized, and the uncertainty of the dissolving time of the dissolvable packing tool is eliminated; the preset dissolving medium mechanism provided by the invention can be used for carrying out acid and alkali resistance treatment on the contact surface of the dissolving medium, so that the dissolving efficiency of the dissolvable sealing tool is improved. The dissolution medium is a prior art and is common knowledge in the art, and will not be described in detail here.
Embodiment two:
a preset dissolution medium mechanism as shown in fig. 1-4 differs from the first embodiment in that: the central tube 1 is a reducer tube with a small inner diameter and a large inner diameter at the top, the body 2 is of a tubular structure which is composed of three sections with different wall thicknesses and is provided with a hollow cavity, the outer diameter of the upper section of the body 2 is matched with the inner diameter of the upper end of the central tube 1, the outer diameter of the lower section of the body 2 is matched with the inner diameter of the side wall of the clamping table 5, and the length of the lower section of the body 2 is the same as the thickness of the clamping table 5; annular grooves are respectively formed on the outer side walls of the upper section and the lower section of the body 2; the upper end surface of the body 2 is higher than the port of the central tube 1.
Preferably, 2-5 annular grooves are formed in the outer side wall of the upper section of the body 2, and 1-3 annular grooves are formed in the outer side wall of the lower section; and 2-6 through holes 7 are symmetrically formed.
Preferably, the outer side wall of the upper section of the body 2 is provided with 3 annular grooves, and the outer side wall of the lower section is provided with 2 annular grooves; and 4 through holes 7 are symmetrically formed.
When in actual use, the annular grooves are formed in the upper outer side wall of the upper section and the lower outer side wall of the body 2, and the sealing ring can be installed in the groove, so that the installation of the sealing ring is more stable, and the sealing effect of the body 2 and the central tube 1 is better; the through holes 7 are symmetrically formed, so that the dissolution medium is put more uniformly, and the dissolution effect is enhanced.
Embodiment III:
a preset dissolution medium mechanism as shown in fig. 1-4 differs from the first embodiment in that: the shear pins 4 are symmetrically arranged.
The upper end face of the body 2 is at least 10mm higher than the upper end face of the ball seat 6.
Preferably, the sealing element 3 is a sealing screw.
Preferably, the body 2 is made of a dissolvable material.
Preferably, the body 2 is made of magnesium-based alloy.
During actual use, the shear pins 4 are symmetrically arranged, so that the fixing requirements are met, and when the fixing piece is required to be sheared, the fixing piece can be sheared rapidly and stably, and the body 2 can be stably dropped on the clamping table 5. When in actual use, the shear nails adopt a certain number of metal shear nails according to actual demands, so that the fixation stability is ensured, and the smooth and steady shearing can be ensured when necessary.
The upper end surface of the body 2 is at least 10mm higher than the upper end surface of the ball seat 6, so that the fracturing ball can be ensured to realize the fracturing function smoothly; the sealing element 3 is a sealing screw, so that the opening and sealing functions can be conveniently finished. The body 2 is made of a soluble material, so that the requirement of degradability is ensured under the condition of meeting the strength, automatic degradation is realized under the specific condition of the underground, and the retention of tools in the well is reduced. Preferably, the body 2 is made of magnesium-based alloy; the magnesium-based alloy has high bearing capacity, reliably completes the plugging of the channels in the tool, and is reliable in sealing, and in a chloride solution, the soluble plugging tool (soluble bridge plug) can be completely dissolved in a short time, and can be dissolved with acid media such as hydrochloric acid and the like in an accelerating way.
In summary, the preset dissolution medium mechanism provided by the invention is designed with the sealed annular space mechanism for presetting the dissolution medium, so that the timed and fixed release of the dissolution medium can be ensured. The main component adopts a degradable material, and can be degraded with time when a certain shaft condition is reached, so that the retention time of the tool in the well is reduced. The preset dissolution medium mechanism has the characteristics of high bearing capacity, reliably completing the plugging of the channels in the tool, being reliable in sealing and capable of automatically releasing the dissolution medium after throwing the fracturing balls, and can be used for multilayer multistage transformation of a reservoir layer based on a dissolvable packing tool (such as a dissolvable bridge plug), thereby meeting the requirement of quick dissolution of the tool after fracturing.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.
The technical solutions between the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art that when the combination of technical solutions contradicts or cannot be implemented, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.
Claims (6)
1. A preset dissolution medium mechanism at least comprising a central tube (1), characterized in that: the inner wall of the central tube (1) is provided with a clamping table (5), the tube wall of the upper port of the central tube (1) is provided with a ball seat (6), a body (2) coaxial with the central tube (1) is sleeved in the central tube (1) through a shear pin (4), an annular cavity (8) is formed between the body (2) and the central tube (1), the side wall of the upper end of the body (2) is matched with the inner diameter of the inner wall of the central tube (1) above the clamping table (5) in a sliding manner, the side wall of the lower end of the body (2) is matched with the inner diameter of the clamping table (5) in a sliding manner, the upper surface of the body (2) is provided with a through hole (7) penetrating through the annular cavity (8), and the upper end of the through hole (7) is provided with a sealing piece (3);
the shear pins (4) are symmetrically arranged, so that the fixing requirements are met, and when the fixing piece is required to be sheared, the fixing piece can be sheared rapidly and surely, and the body (2) can be stably dropped on the clamping table (5);
the body (2) is made of a soluble material;
the central tube (1) is a reducer tube with a small inner diameter and a large inner diameter at the top, the body (2) is of a tubular structure which is composed of three sections with different wall thicknesses and is provided with a hollow cavity, the outer diameter of the upper section of the body (2) is matched with the inner diameter of the upper end of the central tube (1), the outer diameter of the lower section of the body (2) is matched with the inner diameter of the side wall of the clamping table (5), and the length of the lower section of the body (2) is the same as the thickness of the clamping table (5); annular grooves are respectively formed on the outer side walls of the upper section and the lower section of the body (2); the end face of the upper end of the body (2) is higher than the port of the central tube (1);
pouring a dissolving medium into the preset dissolving medium mechanism through the through hole, and tightly covering a sealing piece at the upper end of the through hole; putting a fracturing ball into a preset dissolution medium mechanism, wherein the top end of the body is higher than a ball seat at the upper end of the central tube, so that the fracturing ball is firstly contacted with the body, and in the fracturing process, the body and the central tube relatively move under the pressure action of the fracturing ball, so that a fixing piece is sheared, and the body moves downwards along the central tube until the upper section of the body is clamped at a clamping table; the fracturing ball continues to move downwards until the fracturing ball is located on the central tube ball seat, and a fluid channel in the dissolution medium mechanism is sealed; meanwhile, an annular sealing space between the central tube and the body is opened, and a dissolving medium in the annular sealing space is released to be contacted with a soluble packing tool.
2. A preset dissolution medium mechanism as set forth in claim 1, wherein: 2-5 annular grooves are formed in the outer side wall of the upper section of the body (2), and 1-3 annular grooves are formed in the outer side wall of the lower section of the body; and 2-6 through holes (7) are symmetrically formed.
3. A preset dissolution medium mechanism as claimed in claim 2, wherein: the outer side wall of the upper section of the body (2) is provided with 3 annular grooves, and the outer side wall of the lower section is provided with 2 annular grooves; and 4 through holes (7) are symmetrically formed.
4. A preset dissolution medium mechanism according to claim 1, wherein: the space between the central tube (1) and the body (2) is sealed by a sealing ring.
5. A preset dissolution medium mechanism according to claim 1, wherein: the upper end face of the body (2) is higher than the upper end face of the ball seat (6) by at least 10mm.
6. A preset dissolution medium mechanism according to claim 1, wherein: the sealing piece (3) is a sealing screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811382247.9A CN109488251B (en) | 2018-11-20 | 2018-11-20 | Mechanism for presetting dissolution medium and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811382247.9A CN109488251B (en) | 2018-11-20 | 2018-11-20 | Mechanism for presetting dissolution medium and use method |
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| Publication Number | Publication Date |
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| CN109488251A CN109488251A (en) | 2019-03-19 |
| CN109488251B true CN109488251B (en) | 2024-03-26 |
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| CN201811382247.9A Active CN109488251B (en) | 2018-11-20 | 2018-11-20 | Mechanism for presetting dissolution medium and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109899028A (en) * | 2019-04-26 | 2019-06-18 | 天津市玛特瑞科技有限公司 | A kind of solvable bridge plug |
| CN110513075B (en) * | 2019-08-16 | 2022-05-06 | 中国石油天然气集团有限公司 | Soluble bridge plug and soluble device for accelerating dissolution of bridge plug |
| CN110439522B (en) * | 2019-08-16 | 2022-03-18 | 中国石油化工集团有限公司 | Controllable corrosion opening device for first-section fracturing channel and fracturing sectional operation construction process |
| CN111236879B (en) * | 2020-01-19 | 2022-06-03 | 中国石油天然气股份有限公司 | Soluble tool packing and unpacking method |
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