CN113622866B - Controllable full-degradable bridge plug - Google Patents
Controllable full-degradable bridge plug Download PDFInfo
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- CN113622866B CN113622866B CN202010371931.8A CN202010371931A CN113622866B CN 113622866 B CN113622866 B CN 113622866B CN 202010371931 A CN202010371931 A CN 202010371931A CN 113622866 B CN113622866 B CN 113622866B
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- bridge plug
- seat
- slip
- setting
- plug body
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 57
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000003129 oil well Substances 0.000 claims abstract description 16
- 238000004090 dissolution Methods 0.000 claims description 71
- 230000006978 adaptation Effects 0.000 claims description 16
- 238000012856 packing Methods 0.000 claims description 10
- 210000000707 wrist Anatomy 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 230000008093 supporting effect Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 claims 1
- 238000006731 degradation reaction Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- -1 chlorine ions Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- 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)
- Pipe Accessories (AREA)
Abstract
The invention provides a controllable full-degradable bridge plug, which comprises a bridge plug body and a seat sleeve arranged on the bridge plug body, wherein a sealing rubber cylinder, an upper slip and a lower slip are arranged on the seat sleeve, the sealing rubber cylinder is arranged between the upper slip and the lower slip, the seat sleeve is used for extruding the sealing rubber cylinder before setting so that the upper slip and the lower slip are fixed on the inner wall of an oil well casing, a reaction dissolving cavity is arranged in the bridge plug body, a chemical substance is arranged in the reaction dissolving cavity, an overflow hole with one end communicated with the reaction dissolving cavity is formed in the bridge plug body, the other end of the overflow hole is arranged between two sealing rings arranged on the bridge plug body before setting, and the other end of the overflow hole is communicated with a drain groove formed in the inner end of the seat sleeve after setting, so that liquid in a shaft enters the reaction dissolving cavity through the drain groove and the overflow hole to react with the chemical substance and generate heat.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a controllable full-degradable bridge plug.
Background
The fracturing technology is an important way for modifying low-permeability hydrocarbon reservoirs and realizing benefit development, and the multi-layer staged fracturing technology can realize longitudinal layered modification of vertical wells and qualitative wells so as to improve the oil well yield, wherein the bridge-plug multi-stage fracturing technology is widely applied to the layered fracturing of hydrocarbon wells due to few construction procedures, short period and accurate blocking positions, and is particularly used for the purposes of: setting the bridge plug to a preset position through a cable and pumping process, and then carrying out fracturing construction on a target layer after setting is completed by a setting tool, wherein after the fracturing construction of the target layer is completed, the bridge plug is required to be drilled and ground or dissolved to ensure smoothness of an oil and gas well shaft, so that a subsequent process pipe column can be conveniently put into the oil and gas well to continue production, and therefore, the bridge plug is dissolved to ensure that no post treatment is required after fracturing is completed, the method has the advantages of safe operation and low cost, and good economic and social benefits are obtained for the layering fracturing technology of unconventional oil and gas fields, shale gas, compact oil and the like.
At present, after the fracturing of the target layer is finished, fracturing flowback fluid is generated, and at this time, the bridge plug is dissolved from outside to inside under the action of the fracturing flowback fluid and the formation temperature.
However, when the existing bridge plug is adopted for dissolution, the dissolution speed of the existing bridge plug can be obviously influenced by the concentration of chloride ions in the fracturing flowback fluid and the formation temperature, meanwhile, the concentration of chloride ions in the fracturing flowback fluid and the formation temperature are different for different areas and different wellbores, and when the existing bridge plug is dissolved, operators need to select the bridge plug with corresponding materials according to the concentration of liquid in different wellbores and the formation temperature for dissolution, so that the adaptability, the popularization scale and the dissolution effect of an oil well site can be influenced to a certain extent.
Disclosure of Invention
The invention provides a controllable full-degradable bridge plug, which aims to solve the problems that the bridge plug in the prior art is influenced by the stratum temperature of a well bore and the nature of fracturing flowback fluid and has limited adaptability.
The invention provides a controllable full-degradable bridge plug, which comprises:
the bridge plug comprises a bridge plug body and a seat sleeve arranged on the bridge plug body, wherein a sealing rubber cylinder, an upper slip and a lower slip are arranged on the seat sleeve, and the sealing rubber cylinder is positioned between the upper slip and the lower slip;
the seat envelope is used for extruding the sealing rubber cylinder, the upper slip and the lower slip before setting so that the upper slip and the lower slip are fixed on the inner wall of the oil well casing;
a reaction dissolution cavity is arranged in the bridge plug body, chemical substances are arranged in the reaction dissolution cavity, and an overflow hole with one end communicated with the reaction dissolution cavity is formed in the bridge plug body;
the other end of the overflow hole is positioned between two sealing rings arranged on the bridge plug body before setting and is communicated with a drainage groove arranged at the inner end of the seat sleeve after setting, so that liquid in a shaft enters the reaction dissolution cavity through the drainage groove and the overflow hole to react with chemical substances in the reaction dissolution cavity and generate heat.
In a specific embodiment of the present invention, further comprising: an upper cone and a lower cone;
the upper cone and the lower cone are both fixed on the seat envelope, the upper cone is fixed between the upper slip and the sealing rubber cylinder, the lower cone is fixed between the lower slip and the sealing rubber cylinder, and the upper cone and the lower cone are respectively used for supporting the upper slip and the lower slip.
In the specific embodiment of the invention, two seal rubber cylinder wrists are fixed on the seat envelope, and the seal rubber cylinder wrists are respectively arranged at two sides of the seal rubber cylinder.
In a specific embodiment of the invention, slip compression rings are arranged on the upper slips and the lower slips, and the slip compression rings are used for fixing the upper slips and the lower slips on the seat envelope.
In a specific embodiment of the invention, one end of the reaction dissolution cavity is provided with a sealing plug, and the sealing plug is used for sealing the reaction dissolution cavity before setting.
In the specific embodiment of the invention, a lock ring and a sealing gasket are arranged on the bridge plug body;
the sealing gasket is used for forming a seal with the seat sleeve after being sealed, and locking the sealing gasket and the seat sleeve through the locking ring.
In a specific embodiment of the present invention, further comprising: setting adaptation is carried out;
the setting adaptation is used for connecting the seat cover before setting and pushing the seat cover to move.
In a specific embodiment of the invention, the seat cover is provided with a seat shearing prevention pin, and the seat shearing prevention pin is sheared when being extruded by the seat adaptation, so that the seat adaptation is connected with the seat cover.
In a specific embodiment of the invention, the lower slip is provided with a cone pin for connecting the lower slip and the seat envelope and shearing off when the seat envelope is pressed so as to move the seat envelope towards the upper slip.
In a specific embodiment of the present invention, further comprising: the setting pin connecting buckle is used for connecting the setting adaptation set with the bridge plug body.
The invention provides a controllable full-degradable bridge plug, which comprises a bridge plug body and a seat sleeve arranged on the bridge plug body, wherein a sealing rubber cylinder, an upper slip and a lower slip are arranged on the seat sleeve, the sealing rubber cylinder is positioned between the upper slip and the lower slip, the seat sleeve is used for extruding the sealing rubber cylinder, the upper slip and the lower slip before setting so that the upper slip and the lower slip are fixed on the inner wall of an oil well casing, a reaction dissolution cavity is arranged in the bridge plug body, chemical substances are arranged in the reaction dissolution cavity, an overflow hole with one end communicated with the reaction dissolution cavity is formed in the bridge plug body, the other end of the overflow hole is positioned between two sealing rings arranged on the bridge plug body before setting, and after setting, the other end of the overflow hole is communicated with a drainage groove formed in the inner end of the seat sleeve, so that liquid in a shaft enters the reaction dissolution cavity through the drainage groove and the overflow hole to react with the chemical substances in the reaction dissolution cavity and generate heat.
When the bridge plug is dissolved, the reaction dissolution cavity is formed in the bridge plug body, so that when setting is completed and a small amount of liquid in the shaft after fracturing is finished enters the reaction dissolution cavity and reacts with chemical substances in the reaction dissolution cavity to generate a large amount of heat, the bridge plug body can be promoted to dissolve from the inside to the outside of the bridge plug body, the temperature in the reaction dissolution cavity can be controlled by controlling the amount of the chemical substances in the reaction dissolution cavity, and the dissolution speed of the bridge plug can be controlled, the problem that the conventional bridge plug can be influenced by the temperature of a stratum in the shaft and the concentration of chlorine ions in a fracturing flowback fluid from the outside to the inside when dissolving is solved, meanwhile, the concentration of chlorine ions in the fracturing flowback fluid and the stratum temperature are different for different areas and different shafts, and an operator needs to select the bridge plug body of a corresponding material according to the concentration and the temperature of the liquid in different shafts when the conventional bridge plug is dissolved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a controllable fully degradable bridge plug provided by an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1;
FIG. 3 is a schematic diagram of the connection of a controllable fully degradable bridge plug and a setting tool according to an embodiment of the present invention;
FIG. 4A is a schematic illustration of the structure of a controllable fully degradable bridge plug and well casing prior to setting provided by an embodiment of the present invention;
FIG. 4B is an enlarged schematic view of the encircled portion of FIG. 4A;
FIG. 5A is a schematic illustration of the configuration of a controllable fully degradable bridge plug and well casing after setting provided by an embodiment of the present invention;
fig. 5B is an enlarged schematic view of the circled portion in fig. 5A.
Reference numerals illustrate:
10-a bridge plug body;
11-a reaction dissolution chamber;
111-sealing plugs;
12-overflow aperture;
13-a sealing ring;
14-locking ring;
15-a gasket;
16-setting pin connector link;
20-seat envelope;
21-a drainage groove;
22-setting shear pins;
30-sealing rubber cylinder;
40-upper slips;
50-lower slips;
51-slip compression rings;
52-cone pins;
60-upper cone;
70-lower cone;
80-a sealing rubber sleeve wrist guard;
90-setting adaptation kit;
91-releasing a setting pin;
92-weak release point;
100-well casing.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
Fig. 1 is a schematic structural view of a controllable full-degradable bridge plug provided by an embodiment of the present invention, fig. 2 is a schematic sectional view along A-A direction in fig. 1, fig. 3 is a schematic structural view of a controllable full-degradable bridge plug provided by an embodiment of the present invention connected with a setting tool, fig. 4A is a schematic structural view of a controllable full-degradable bridge plug and an oil well casing provided by an embodiment of the present invention before setting, fig. 4B is an enlarged structural view of a circle portion in fig. 4A, fig. 5A is a schematic structural view of a controllable full-degradable bridge plug and an oil well casing provided by an embodiment of the present invention after setting, and fig. 5B is an enlarged structural view of a circle portion in fig. 5A.
The embodiment provides a controllable full-degradable bridge plug which can be applied to an oil-gas well layered fracturing technology to realize layered fracturing of a vertical well and a qualitative well.
Referring to fig. 1, the present embodiment provides a controllable fully degradable bridge plug, which may include a bridge plug body 10 and a seat envelope 20 provided on the bridge plug body 10, wherein a packing element 30, an upper slip 40 and a lower slip 50 may be provided on the seat envelope 20, the packing element 30 is located between the upper slip 40 and the lower slip 50, and the seat envelope 20 is used to press the packing element 30, the upper slip 40 and the lower slip 50 before setting, so that the upper slip 40 and the lower slip 50 are fixed on an inner wall of an oil well casing 100.
In this embodiment, the bridge plug body 10 may be made of a fully degradable polymer resin material, which is an environment-friendly material with a tensile strength of 110Mpa and a bending strength of 198Mpa.
In this embodiment, referring to fig. 1 and 2, a reaction dissolution chamber 11 is provided in a bridge plug body 10, and a chemical substance is provided in the reaction dissolution chamber 11, and in this embodiment, the chemical substance in the reaction dissolution chamber 11 is described as calcium oxide.
In this embodiment, one end of the bridge plug body 10 is provided with an overflow hole 12 communicated with the reaction dissolution cavity 11, the other end of the overflow hole 12 can be located between two sealing rings 13 arranged on the bridge plug body 10 before setting, and the other end of the overflow hole 12 is communicated with a drainage groove 21 formed in the inner end of the seat cover 20 after setting, so that after setting is completed, liquid in a shaft can enter the reaction dissolution cavity 11 through the drainage groove 21 and the overflow hole 12, wherein water in the shaft encounters calcium oxide in the reaction dissolution cavity 11 to react and generate a large amount of heat, and the heat generated in the reaction dissolution cavity 11 can promote the bridge plug to dissolve from the inside of the bridge plug body 10 to the outside during dissolution.
In this embodiment, the temperature in the reaction dissolution cavity 11 can be specifically controlled by controlling the amount of the chemical in the reaction dissolution cavity 11, so as to control the dissolution speed of the bridge plug, so that the problem that the existing bridge plug is affected by the formation temperature in the shaft and the concentration of the chloride ions in the fracturing flowback fluid when being dissolved from the outside to the inside of the bridge plug body 10 can be avoided, meanwhile, the concentration of the chloride ions in the fracturing flowback fluid and the formation temperature are also different for different areas and different shafts, operators need to select the bridge plug with corresponding materials according to the concentration of the liquid in different shafts and the formation temperature to dissolve the existing bridge plug, in this embodiment, the amount of the selected chemical is not limited, and can be specifically determined according to the actual situation of the oilfield site.
In this embodiment, two sealing rings 13 are provided on the bridge plug body 10, so that the reaction dissolution cavity 11 before setting can be ensured to be a closed body, and the liquid in the well bore can not enter the reaction dissolution cavity 11, so as to ensure that the bridge plug can be always in an environment condition that is not degraded before fracturing begins.
In this embodiment, the liquid in the well bore also contains sodium carbonate, iron powder, aluminum powder, coke powder, activated carbon, salt, etc., and also enters the reaction dissolution chamber 11 along with the moisture through the drainage groove 21 and the overflow hole 12, and when the calcium oxide in the reaction dissolution chamber 11 reacts with water, other substances in the well bore can be used for relieving the severe reaction of the calcium oxide and the water, so that the reaction rate is controllable.
The controllable full-degradable bridge plug provided by the embodiment specifically comprises the following operation: referring to fig. 3, after the bridge plug and setting tool, i.e., setting adapter sleeve 90, is first lowered into the target well zone by cable, the setting adapter sleeve 90 is connected to the seat envelope 20.
Next, referring to fig. 4A and 4B, the pre-setting drainage groove 21 is located inside the seat envelope 20 and is in no contact with the two sealing rings 13 formed on the bridge plug body 10, one end of the overflow hole 12 formed on the bridge plug body 10 is connected with the reaction dissolution cavity 11, and the other end is located between the two sealing rings 13, and in addition, the sealing rubber barrel 30, the upper slips 40, the lower slips 50 and the inner wall of the oil well casing 100 are in no contact, so that the sealing rings 13 are arranged on the bridge plug body 10 in a sealing manner, the reaction dissolution cavity 11 before setting is ensured to be a closed body, and liquid in a shaft cannot enter the reaction dissolution cavity 11, so that the bridge plug can be always in an environment condition that is not degraded before fracturing begins.
Then, as shown in fig. 5A and 5B, with the continuous extrusion of the setting adaptation set 90, the seat envelope 20 begins to extrude the packing element 30, the upper slips 40 and the lower slips 50 in the longitudinal direction under the action of the setting adaptation set 90, at this time, the drainage groove 21 slides in the seat envelope 20, when the drainage groove 21 slides over the two seal rings 13, the other end of the overflow hole 12 communicates with the drainage groove 21, and at the same time, the seated rear end of the seat envelope 20 is connected with the bridge plug body 10, thereby completing the setting, at this time, the upper slips 40 and the lower slips 50 will generate interaction force to seal with the inner wall of the well casing 100 after contacting with the inner wall of the well casing 100, and after the setting is completed, the release setting pin 91 will be released from the weak release point 92.
Then, after completion of setting, the fracturing construction is started on the target layer, after completion of the fracturing construction, liquid in the shaft enters the reaction dissolution cavity 11 through the drainage groove 21 and the overflow hole 12 and reacts with calcium oxide in the reaction dissolution cavity 11, a large amount of heat is generated simultaneously, the heat can promote the bridge plug to dissolve from the inside to the outside of the bridge plug body 10 during dissolution, the temperature in the reaction dissolution cavity 11 can be controlled by controlling the amount of chemical in the reaction dissolution cavity 11, and the dissolution speed of the bridge plug can be controlled, so that the problem that the conventional bridge plug is influenced by the formation temperature in the shaft and the concentration of chlorine ions in the fracturing flowback fluid when the bridge plug is dissolved from the outside to the inside of the bridge plug body can be avoided.
The controllable full-degradable bridge plug provided by the embodiment comprises a bridge plug body 10 and a seat sleeve 20 arranged on the bridge plug body 10, wherein a sealing rubber cylinder 30, an upper slip 40 and a lower slip 50 are arranged on the seat sleeve 20, the sealing rubber cylinder 30 is positioned between the upper slip 40 and the lower slip 50, the seat sleeve 20 is used for extruding the sealing rubber cylinder 30, the upper slip 40 and the lower slip 50 before setting so that the upper slip 40 and the lower slip 50 are fixed on the inner wall of an oil well casing 100, a reaction dissolution cavity 11 is arranged in the bridge plug body 10, a chemical substance is arranged in the reaction dissolution cavity 11, an overflow hole 12 with one end communicated with the reaction dissolution cavity 11 is formed in the bridge plug body 10, the other end of the overflow hole 12 is positioned between two sealing rings 13 arranged on the bridge plug body 10 before setting, and after setting, the other end of the overflow hole 12 is communicated with a chute 21 formed in the inner end of the seat sleeve 20, so that liquid in a well shaft enters the reaction dissolution cavity 11 through the chute 21 and the overflow hole 12 to react with the chemical substance in the reaction dissolution cavity 11 and generate heat.
When the bridge plug is dissolved, the reaction dissolution cavity 11 is arranged in the bridge plug body 10, when setting is completed and a small amount of liquid in the shaft enters the reaction dissolution cavity 11 to react with calcium oxide in the reaction dissolution cavity 11 and generate a large amount of heat, the heat can promote the bridge plug to dissolve from the inside to the outside of the bridge plug body 10 during dissolution, the temperature in the reaction dissolution cavity 11 can be controlled by controlling the amount of chemical in the reaction dissolution cavity 11, and the dissolution speed of the bridge plug can be further controlled, so that the problem that the existing bridge plug can be influenced by the temperature of a stratum in the shaft and the concentration of chlorine ions in a fracturing flow-back fluid from the outside to the inside during dissolution can be avoided, meanwhile, the existing bridge plug is required to be dissolved according to the concentration of the liquid in different shafts and the stratum temperature, and the operating personnel need to select the bridge plug of corresponding materials during the existing bridge plug dissolution, and the bridge plug can be conveniently popularized in an oil well site in a large scale, has high adaptability and is easy to operate reliably and can be influenced by the concentration of the existing bridge plug in the well and the fracturing flow-back fluid chlorine concentration can be solved.
On the basis of the above embodiment, as shown in fig. 1, the present embodiment may further include an upper cone 60 and a lower cone 70, where the upper cone 60 and the lower cone 70 are fixed on the seat envelope 20, and the upper cone 60 is fixed between the upper slip 40 and the sealing rubber 30, the lower cone 70 is fixed between the lower slip 50 and the sealing rubber 30, and the upper cone 60 and the lower cone 70 are respectively used for supporting the upper slip 40 and the lower slip 50.
In this embodiment, by including the upper cone 60 and the lower cone 70, a certain supporting effect can be provided to the upper slip 40 and the lower slip 50, so that when setting, the specific operations are as follows: after the bridge plug and the setting adapter sleeve 90 are first lowered into the target well level by the cable, the setting adapter sleeve 90 is connected with the seat sleeve 20, and as the setting adapter sleeve 90 is continuously extruded, the seat sleeve 20 and the lower cone 70 start to move downwards to push the lower slips 50 to be fixed on the inner wall of the oil well casing 100 so as to realize setting of the lower slips 50, and the lower slips 50 finish setting, the seat sleeve 20 continues to squeeze the sealing rubber cylinder 30 and the upper cone 60 until the upper slips 40 are fixed on the inner wall of the oil well casing 100, and meanwhile, the seat sleeve 20 is connected with the bridge plug body 10 at the sitting end part, so that setting is completed.
Based on the above embodiment, in this embodiment, referring to fig. 1, two seal rubber sleeve wrists 80 may be fixed on the seat cover 20, and the seal rubber sleeve wrists 80 are respectively disposed at two sides of the seal rubber sleeve 30, so that when in setting, the seat cover 20 continuously extrudes the seal rubber sleeve 30 along with the seat cover 20 being continuously extruded by the seat cover fitting member 90, the outer diameter of the seal rubber sleeve 30 is continuously increased under the continuous extrusion action, and thus, by fixing the seal rubber sleeve wrists 80 at two sides of the seal rubber sleeve 30, the seal rubber sleeve 30 can be protected, and the problem of poor sealing property caused by cracking caused by excessively extruding the seal rubber sleeve 30 is avoided.
In the above embodiment, referring to fig. 1, the upper slip 40 and the lower slip 50 may be provided with slip compression rings 51, and in this embodiment, the upper slip 40 and the lower slip 50 may be fixed on the seat envelope 20 by providing slip compression rings 51 on the upper slip 40 and the lower slip 50.
Based on the above embodiment, in this embodiment, referring to fig. 1, one end of the reaction dissolution chamber 11 may be provided with a sealing plug 111, so that the reaction dissolution chamber 11 before setting may be ensured to be a sealed body, and the liquid in the wellbore may not enter the reaction dissolution chamber 11, so as to ensure that the bridge plug may be in an environment condition that is not degraded before fracturing begins.
In the present embodiment, as shown in fig. 1, a locking ring 14 and a gasket 15 may be provided on the bridge plug body 10, the gasket 15 being used to form a seal with the seat envelope 20 at the rear end after being seated, and the gasket 15 being locked with the seat envelope 20 at the rear end by the locking ring 14.
In this embodiment, by providing the locking ring 14 and the sealing gasket 15 on the bridge plug body 10, so that when the bridge plug body 10 is set, along with continuous extrusion of the setting adaptation set 90, the seat envelope 20 begins to longitudinally extrude the sealing rubber sleeve 30, the upper slips 40 and the lower slips 50 under the action of the setting adaptation set 90, at this time, the drainage groove 21 slides in the seat envelope 20, when the drainage groove 21 slides over the two sealing rings 13, the other end of the drainage hole 12 is communicated with the drainage groove 21, and at the same time, the seated rear end of the seat envelope 20 is connected with the sealing gasket 15 on the bridge plug body 10, and the sealing gasket 15 is locked with the seated rear end of the seat envelope 20 through the locking ring 14 on the bridge plug body 10, at this time, the upper slips 40 and the lower slips 50 generate interaction force after contacting with the inner wall of the oil well casing 100, so as to be fixed on the inner wall of the oil well casing 100.
On the basis of the above embodiment, referring to fig. 1, the seat cover 20 may be provided with the anti-setting shear pin 22, so that when the seat cover 20 is pressed by the setting adaptation kit 90 during setting, the anti-setting shear pin 22 on the seat cover 20 is sheared, so that the setting adaptation kit 90 is connected to the seat cover 20 and performs setting.
On the basis of the above embodiment, in this embodiment, referring to fig. 1, a cone pin 52 may be provided on the lower slip 50, and the cone pin 52 is used to connect the lower slip 50 and the seat envelope 20, and to shear when the seat envelope 20 is pressed, so as to move the seat envelope 20 toward the upper slip 40.
In this embodiment, by providing the cone pins 52 on the lower slips 50, such that when setting, the bridge plug and setting adapter sleeve 90 are first lowered into the target well zone by the cable, the setting adapter sleeve 90 is connected to the seat envelope 20, with continued compression of the setting adapter sleeve 90, the anti-setting shear pins 22 on the seat envelope 20 shear and squeeze the seat envelope 20, then the seat envelope 20 and lower cone 70 begin to move downward to push the lower slips 50 to secure against the inner wall of the well casing 100 to effect setting of the lower slips 50, while the cone pins 52 on the lower slips 50 shear when squeezed, then the seat envelope 20 continues to squeeze the packing element 30, upper cone 60 and upper slips 40 until the upper slips 40 are secured against the inner wall of the well casing 100, while the seat envelope 20 is connected at its seated rear end to the packing 15 on the bridge plug body 10, and the packing 15 is locked against the seat envelope 20 by the locking ring 14 on the bridge plug body 10, thereby completing the setting.
On the basis of the above embodiment, referring to fig. 1, the present embodiment may further include a setting pin connector 16, so that the setting adaptation set 90 may be connected to the bridge plug body 10 by the setting pin connector 16 during setting, so as to complete the setting.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. A controllable fully degradable bridge plug comprising: the bridge plug comprises a bridge plug body and a seat sleeve arranged on the bridge plug body, wherein a sealing rubber cylinder, an upper slip and a lower slip are arranged on the seat sleeve, and the sealing rubber cylinder is positioned between the upper slip and the lower slip;
the seat envelope is used for extruding the sealing rubber cylinder, the upper slip and the lower slip before setting so that the upper slip and the lower slip are fixed on the inner wall of the oil well casing;
a reaction dissolution cavity is arranged in the bridge plug body, chemical substances are arranged in the reaction dissolution cavity, and an overflow hole with one end communicated with the reaction dissolution cavity is formed in the bridge plug body;
the other end of the overflow hole is positioned between two sealing rings arranged on the bridge plug body before setting and communicated with a drainage groove arranged at the inner end of the seat sleeve after setting, so that liquid in a shaft enters the reaction dissolution cavity through the drainage groove and the overflow hole to react with chemical substances in the reaction dissolution cavity and generate heat; the liquid in the shaft comprises sodium carbonate, iron powder, aluminum powder, coke powder, activated carbon and salt;
one end of the reaction dissolution cavity is provided with a sealing plug, and the sealing plug is used for sealing the reaction dissolution cavity before setting.
2. The controllable fully degradable bridge plug of claim 1, further comprising: an upper cone and a lower cone;
the upper cone and the lower cone are both fixed on the seat envelope, the upper cone is fixed between the upper slip and the sealing rubber cylinder, the lower cone is fixed between the lower slip and the sealing rubber cylinder, and the upper cone and the lower cone are respectively used for supporting the upper slip and the lower slip.
3. The controllable fully degradable bridge plug of claim 2, wherein two packing element wrists are fixed on the seat envelope, and the packing element wrists are respectively arranged at two sides of the packing element.
4. A controllable fully degradable bridge plug according to any one of claims 1-3, wherein slip pressure rings are provided on both the upper and lower slips, the slip pressure rings being used to secure the upper and lower slips to the seat envelope.
5. The controllable fully degradable bridge plug according to claim 1, wherein a lock ring and a sealing gasket are arranged on the bridge plug body;
the sealing gasket is used for forming a seal with the rear end part of the seat cover after being sealed, and the sealing gasket and the seat cover are locked through the locking ring.
6. The controllable fully degradable bridge plug of claim 5, further comprising: setting adaptation is carried out;
the setting adaptation is used for connecting the seat cover before setting and pushing the seat cover to move.
7. The controllable fully degradable bridge plug of claim 6, wherein said seat cover is provided with a seat shear pin which shears when squeezed by said seat adapter fitting to enable said seat adapter fitting to be attached to said seat cover.
8. The controlled full degradation bridge plug of claim 2, wherein the lower slips are provided with cone pins for connecting the lower slips and the seat envelope and shearing off when the seat envelope is squeezed to move the seat envelope toward the upper slips.
9. The controllable fully degradable bridge plug of claim 6, further comprising: the setting pin connecting buckle is used for connecting the setting adaptation set with the bridge plug body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371931.8A CN113622866B (en) | 2020-05-06 | 2020-05-06 | Controllable full-degradable bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010371931.8A CN113622866B (en) | 2020-05-06 | 2020-05-06 | Controllable full-degradable bridge plug |
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| Publication Number | Publication Date |
|---|---|
| CN113622866A CN113622866A (en) | 2021-11-09 |
| CN113622866B true CN113622866B (en) | 2023-06-30 |
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| CN202010371931.8A Active CN113622866B (en) | 2020-05-06 | 2020-05-06 | Controllable full-degradable bridge plug |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8267177B1 (en) * | 2008-08-15 | 2012-09-18 | Exelis Inc. | Means for creating field configurable bridge, fracture or soluble insert plugs |
| CN105064953B (en) * | 2015-07-20 | 2017-09-05 | 中国石油集团渤海钻探工程有限公司 | With the fast degradation bridging plug for promoting degraded central tube |
| CN106677738B (en) * | 2017-03-07 | 2023-03-31 | 牡丹江市新翔石油机械有限责任公司 | Soluble packer |
| CN108533214B (en) * | 2018-04-10 | 2020-02-21 | 重庆地质矿产研究院 | Degradable alloy and application thereof as single slip type soluble bridge plug |
| CN113047808A (en) * | 2018-12-07 | 2021-06-29 | 路博 | Self-disassembly type soluble bridge plug |
| 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 |
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| CN113622866A (en) | 2021-11-09 |
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