CN112412342B - Breakable blind plate type floating coupling device, using method and preparation method of blind plate - Google Patents
Breakable blind plate type floating coupling device, using method and preparation method of blind plate Download PDFInfo
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- CN112412342B CN112412342B CN202011482660.XA CN202011482660A CN112412342B CN 112412342 B CN112412342 B CN 112412342B CN 202011482660 A CN202011482660 A CN 202011482660A CN 112412342 B CN112412342 B CN 112412342B
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- 238000007667 floating Methods 0.000 title claims abstract description 49
- 230000008878 coupling Effects 0.000 title claims abstract description 23
- 238000010168 coupling process Methods 0.000 title claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000010304 firing Methods 0.000 claims abstract description 42
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 15
- 239000000843 powder Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 239000005388 borosilicate glass Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 229910021538 borax Inorganic materials 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000004328 sodium tetraborate Substances 0.000 description 3
- 235000010339 sodium tetraborate Nutrition 0.000 description 3
- 239000002195 soluble material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Classifications
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Emergency Lowering Means (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a breakable blind plate type floating coupling device, a using method and a blind plate preparation method. The breakable blind plate is broken into powder under the impact of the firing pin, the breaking effect is good, the circulating channel is reestablished in the sleeve string after the breakable blind plate is broken, and the subsequent well cementation construction operation can be carried out.
Description
Technical Field
The invention belongs to the field of floating casing running of petroleum well completion, and particularly relates to a breakable blind plate type floating coupling device, a using method and a preparation method of a blind plate.
Background
With the development and development of long-section horizontal wells, the problem of increasing the running friction resistance of horizontal-section casing pipes is getting worse.
The existing floating casing running technology is a main solving means, a floating coupling is required to be used for a well with a compact oil horizontal section length exceeding 1800 m, and the existing floating coupling mainly adopts the following modes:
(1) The imported blind plate type floating coupling has relatively good safety, but is expensive, and the economic benefit is greatly reduced.
(2) The sliding sleeve type floating coupling is limited by a tool structure, the use safety is poor, and the horizontal section sleeve cannot be deformed.
(3) The double-stage sliding sleeve type or soluble material structure has the conditions that the sliding sleeve is blocked or the soluble material fails and the like when the double-stage sliding sleeve type or soluble material structure is used on site, so that the sleeve cannot be ensured to be smoothly put into a well bottom, even the subsequent well cementation construction cannot be carried out, certain risks are brought to the site use, and the use requirements of the well cementation construction cannot be met.
Disclosure of Invention
The invention aims to provide a breakable blind plate type floating coupling device, a using method and a preparation method of a blind plate, so as to overcome the technical defects.
In order to solve the technical problem, the invention provides a breakable blind plate type floating coupling device which comprises an upper joint and a lower joint which are arranged up and down and are screwed, wherein an annular groove is formed in the inner wall of the upper joint, a breakable blind plate, a limiting ring and a firing pin ring are sequentially embedded in the annular groove from top to bottom, the lower end surface of the breakable blind plate is tightly attached to the upper end surface of the limiting ring, and a gap is reserved between the lower end surface of the limiting ring and the upper end surface of the firing pin ring;
the ring surface of the firing pin ring is inserted with a plurality of firing pins which can penetrate through the limiting ring to smash the breakable blind plate.
Furthermore, the breakable blind plate is of a hemispherical hollow structure, a ball of the hollow hemisphere horizontally extends along the radial direction away from the center of the ball to form a bottom edge, the bottom edge is inserted and embedded in the annular groove in a sealing manner, and the lower surface of the bottom edge is tightly attached to the upper end face of the limiting ring;
wherein the opening of the hollow hemisphere faces the lower joint.
Preferably, the limiting ring is a solid circular ring-shaped structure with thickness, the inner ring wall of the solid circular ring is provided with a plurality of needle passing channels for the firing pin to penetrate through, each needle passing channel is the same in structure and is formed by inwards recessing the inner ring wall, the radial section of each needle passing channel is semicircular, and the central axis of each needle passing channel is parallel to the central axis of the limiting ring.
Furthermore, a plurality of threaded holes are formed in the ring body of the limiting ring, the central axis of each threaded hole is perpendicular to the central axis of the limiting ring, a shear pin is screwed in each threaded hole, and the thread end face of the tail of each shear pin penetrates into the annular groove to be fixed and limited.
Preferably, a plurality of needle passageway evenly spaced distribution is crossed in the interior rampart of spacing ring, and a plurality of shear pin evenly spaced distribution is in the spacing ring body simultaneously, and crosses needle passageway and shear pin interval distribution.
Furthermore, the needle striking ring is a solid ring body, the solid ring body is provided with a plurality of blind holes for containing the firing pins, the central axis of each blind hole is parallel to the central axis of the firing pin ring, one end of each firing pin is inserted into the blind hole, the other end of each firing pin is a sharp end, and the sharp end is positioned in the needle passing channel or passes through the needle passing channel to impact the breakable blind plate.
Preferably, the inner wall of the lower end of the upper joint is provided with internal threads, the outer wall of the upper end of the lower joint is provided with external threads, the internal threads and the external threads are mutually screwed, the screwed part is provided with jackscrews distributed at 180 degrees, and the jackscrews penetrate through the upper joint and are screwed into the lower joint;
wherein the needle striking ring is seated on the upper end surface of the lower joint.
Preferably, the screwing part of the upper joint and the lower joint is also provided with a sealing ring sleeved on the lower joint, and the sealing ring is positioned between the needle striking ring and the jackscrew.
The invention also provides a use method of the breakable blind plate type floating coupling device, which comprises the following steps:
floating state
Connecting the breakable blind plate type floating coupling device in series with the casing string, wherein a closed space is formed between two adjacent breakable blind plates, the closed space forms an air bag filled with air, and the air bag drives the casing to float when the casing is in the completion fluid;
crushed state
If the well is blocked, drilling fluid is injected into the casing string;
the drilling fluid is continuously pressurized to cut off all shear pins, the breakable blind plate pushes the limiting ring to move downwards to force the firing pin to impact the breakable blind plate, and after the breakable blind plate is broken, the interior of the casing string is reestablished with a circulation channel, so that subsequent well cementation construction operation can be carried out.
The invention also discloses a preparation method of the breakable blind plate, the breakable blind plate is a three-layer structure made of high borosilicate glass, and the high borosilicate glass comprises the following components:
80% of quartz sand;
10 percent of borax;
5% of boric acid;
3% of aluminum hydroxide;
2% of sodium chloride;
the outermost layer and the innermost layer in the three-layer structure are prepared by a 15MPa pressure blowing method, and the middle layer is prepared by a normal pressure rotary blowing method;
the breakable blind plate is broken into powder by the impact of the firing pin.
The invention has the following beneficial effects:
(1) The breakable blind plate is made of high borosilicate glass with special components, has high pressure resistance and can bear pressure of 30-55 MPa, a closed space is formed between two adjacent floating coupling devices, the closed space forms an air bag filled with air, when the sleeve is in the well completion fluid, the air bag can generate upward buoyancy, the friction force between the pipe column and the lower surface is reduced, and the sleeve can be smoothly put into place.
(2) The breakable blind plate is broken into powder under the impact of the firing pin, the breaking effect is good, the circulating channel is reestablished in the sleeve string after the breakable blind plate is broken, and the subsequent well cementation construction operation can be carried out.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Figure 1 is a cross-sectional view of a breakable blind plate floating collar device.
Fig. 2 is a cross-sectional view of a breakable blind.
FIG. 3 is a front view of the stop collar.
Fig. 4 is a top view of the stop collar.
FIG. 5 is a cross-sectional view of the striker ring.
Fig. 6 is a cross-sectional view of the striker.
Fig. 7 is a schematic structural view of a breakable blind plate floating collar device in an initial state.
Fig. 8 is a schematic structural view of a breakable blind plate floating collar device in a broken state.
Description of reference numerals:
1. an upper joint; 2. the blind plate can be broken; 3. a limiting ring; 4. a needle striking ring; 5. a striker; 6. a lower joint; 7. shearing the nails; 8. carrying out top thread; 9. a seal ring; 10. a needle passage; 11. and (4) blind holes.
Detailed Description
The following description is given by way of example of the present invention and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
In the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the breakable blind plate type floating collar device described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
First embodiment
The embodiment relates to a breakable blind plate type floating collar device, which comprises an upper joint 1 and a lower joint 6 which are arranged up and down and are screwed, wherein as shown in figure 1, an annular groove is formed in the inner wall of the upper joint 1, a breakable blind plate 2, a limiting ring 3 and a firing pin ring 4 are sequentially embedded in the annular groove from top to bottom, the lower end surface of the breakable blind plate 2 is tightly attached to the upper end surface of the limiting ring 3, and a gap is reserved between the lower end surface of the limiting ring 3 and the upper end surface of the firing pin ring 4;
the ring surface of the striker ring 4 is inserted with a plurality of strikers 5 which can penetrate through the limit ring 3 to smash the breakable blind plate 2.
The breakable blind plate type floating coupling device has two states after being put into a well:
a floating state: as shown in fig. 7, the breakable blind plate type floating collar device is connected in series with the casing string, a closed space is formed between two adjacent breakable blind plates 2, the closed space forms an air bag filled with air, when the casing is in the completion fluid, the air bag drives the casing to float, and at the moment, the sharp end of the firing pin 5 is not in contact with the breakable blind plates 2;
a crushing state: as shown in figure 8, if the well is blocked, drilling fluid is poured into the casing string, the drilling fluid is continuously pressurized, the breakable blind plate 2 pushes the limiting ring 3 to move downwards to force the firing pin 5 to impact the breakable blind plate 2, and after the breakable blind plate 2 is broken, the circulation channel is reestablished in the casing string, so that subsequent well cementation construction operation can be carried out.
In a floating state, the cavity in the coupling device is divided into an upper cavity and a lower cavity by the breakable blind plate 2, and in order to ensure the floating of the sleeve, the breakable blind plate 2 is hermetically arranged in the annular groove, for example, a sealing ring can be sleeved at the joint of the two, or other sealing modes can be adopted, and no specific limitation is imposed.
The breakable blind plate 2 can be broken into powder after being broken by impact, and is easy to be taken away by drilling fluid, so that the smoothness in a well is ensured.
The striker ring 4 is used for accommodating the striker 5, and the limiting ring 3 is used for limiting the striker 5 to prevent the striker from shaking.
Second embodiment
The embodiment relates to a breakable blind plate type floating collar device, which comprises an upper joint 1 and a lower joint 6 which are arranged up and down and are screwed, wherein as shown in figure 1, an annular groove is formed in the inner wall of the upper joint 1, a breakable blind plate 2, a limiting ring 3 and a firing pin ring 4 are sequentially embedded in the annular groove from top to bottom, the lower end face of the breakable blind plate 2 is tightly attached to the upper end face of the limiting ring 3, and a gap is reserved between the lower end face of the limiting ring 3 and the upper end face of the firing pin ring 4;
the ring surface of the firing pin ring 4 is inserted with a plurality of firing pins 5 which can penetrate through the limiting ring 3 to crush the breakable blind plate 2.
Referring to fig. 2, the breakable blind plate 2 is a hemispherical hollow structure, a ball of the hollow hemisphere horizontally extends along a radial direction away from a ball center to form a bottom edge, the bottom edge is inserted and embedded in the annular groove in a sealing manner, and the lower surface of the bottom edge is tightly attached to the upper end surface of the limit ring 3;
with the opening of the hollow hemisphere facing the lower fitting 6.
The breakable blind plate 2 is in an arch shape, the bearing pressure is increased while the stress area is increased, according to the underground pressure, the bearing pressure of the breakable blind plate 2 is 30-55 MPa, namely when the drilling fluid is filled into the sleeve, the drilling fluid continuously pressurizes the semi-spherical hollow structure gradually, under the pressure of 30-55 MPa, the breakable blind plate 2 cannot be broken, when the pressure exceeds 30-55 MPa (the specific numerical value changes according to the underground actual pressure), the breakable blind plate 2 pushes the limit ring 3 to move downwards, the firing pin 5 is forced to strike the breakable blind plate 2, and the breakable blind plate 2 is broken into powder.
In order to improve the sealing performance of the breakable blind plate 2, the contact part of the breakable blind plate 2 and the annular groove is in sealing contact.
Referring to fig. 3 and 4, the stop collar 3 is a solid ring-shaped structure with a thickness, an inner annular wall of the solid ring is provided with a plurality of needle passing channels 10 for the striker 5 to penetrate through, each needle passing channel 10 has the same structure and is formed by inwards recessing the inner annular wall, and a radial cross section of each needle passing channel is semicircular, as shown in fig. 4, a central axis of each needle passing channel 10 is parallel to a central axis of the stop collar 3.
The striker 5 has a length such that one end thereof is inserted into the striker ring 4 and the other end thereof is a sharp end, the sharp end and the middle section thereof penetrate through the needle passage 10, and the sharp end is in the needle passage 10 in a floating state; in the crushing state, the sharp end passes through the needle passage 10 and directly hits the crushable blind plate 2.
In order to ensure that the breakable blind 2 is broken, the firing pin 5 must be installed with its sharp end facing the inner spherical surface of the hemisphere.
Referring to fig. 3, a plurality of threaded holes are formed in the ring body of the limiting ring 3, the central axis of each threaded hole is perpendicular to the central axis of the limiting ring 3, a shear pin 7 is screwed in each threaded hole, and the tail thread end face of each shear pin 7 penetrates into the annular groove to be fixed and limited.
A crushing state: if the sleeve is blocked when entering the well, drilling fluid is poured into the sleeve string, the drilling fluid is continuously pressurized to cut off all the shear pins 7, the breakable blind plate 2 pushes the limiting ring 3 to move downwards to force the firing pin 5 to impact the breakable blind plate 2, and after the breakable blind plate 2 is broken, the circulation channel is reestablished in the sleeve string, so that subsequent well cementation construction operation can be carried out.
The shear pin 7 serves to fix the stop collar 3.
The plurality of needle passing channels 10 are uniformly distributed on the inner annular wall of the limit ring 3 at intervals, the plurality of shear pins 7 are uniformly distributed on the ring body of the limit ring 3 at intervals, and the needle passing channels 10 and the shear pins 7 are distributed at intervals, as shown in fig. 4, taking six needle passing channels 10 as an example, the six needle passing channels are uniformly distributed at intervals, and a threaded hole for screwing the shear pin 7 is formed between every two adjacent needle passing channels 10, so that the number of the shear pins 7 is six, which is only an example, and can be other numbers.
As shown in fig. 5, the striker ring 4 is a solid ring body, the solid ring body is provided with a plurality of blind holes 11 for accommodating the strikers 5, the central axis of the blind holes 11 is parallel to the central axis of the striker ring 4, one end of each striker 5 is inserted into the blind hole 11, the other end is a sharp end, and the sharp end is located in the needle passing channel 10 or passes through the needle passing channel 10 to impact the breakable blind plate 2.
The striker ring 4 mainly functions to accommodate the striker 5, and the structure of the striker 5 is shown in fig. 6.
The number of the firing pins 5, the blind holes 11 and the needle passing channels 10 is the same.
In a floating state: as shown in fig. 7, the sharp end is in the needle passage 10.
In a crushed state: the sharp end then passes through the needle passage 10, striking the breakable blind 2 straight, as shown in fig. 8.
Taking fig. 1 as an example, the inner wall of the lower end of the upper joint 1 is provided with an internal thread, the outer wall of the upper end of the lower joint 6 is provided with an external thread, the internal thread and the external thread are mutually screwed, the screwing part is provided with a jackscrew 8 distributed by 180 degrees, the jackscrew 8 penetrates through the upper joint 1 and is screwed into the lower joint 6, and the needle striking ring 4 is seated on the upper end face of the lower joint 6.
The top connection 1 and the lower connection 6 are connected through threads, in order to strengthen the stable connection between the top connection 1 and the lower connection 6, a jackscrew 8 is additionally arranged, thread through holes distributed 180 degrees are formed in the thread section of the top connection 1, a jackscrew 8 is screwed in each thread through hole, and the jackscrew 8 penetrates through the thread through holes and enables the end part of the jackscrew to abut against the outer thread of the lower connection 6.
Threaded connection and jackscrew connection have carried out dual assurance to upper and lower joint, avoid its slippage.
In order to enhance the sealing performance of the connecting part and ensure the floating effect, a sealing ring 9 sleeved on the lower joint 6 is further arranged at the screwing part of the upper joint 1 and the lower joint 6, and the sealing ring 9 is positioned between the needle striking ring 4 and the jackscrew 8.
Third embodiment
The embodiment provides a using method of a breakable blind plate type floating coupling device, which at least comprises the breakable blind plate type floating coupling device, and the using method specifically comprises the following steps:
floating state
Referring to fig. 7, the breakable blind plate type floating coupling device is connected in series with the casing string, a closed space is formed between two adjacent breakable blind plates 2, the closed space forms an air bag filled with air, and the air bag drives the casing to float when the casing is in the completion fluid;
crushed state
Referring to fig. 8, if the well is blocked, drilling fluid is injected into the casing string;
the drilling fluid is continuously pressurized to cut off all the shear pins 7, the breakable blind plate 2 pushes the limit ring 3 to move downwards to force the firing pin 5 to impact the breakable blind plate 2, and after the breakable blind plate 2 is broken, the circulation channel is reestablished in the casing string, so that subsequent well cementation construction operation can be carried out.
The concrete structure of the breakable blind plate type floating coupling device is as follows:
the breakable blind plate type floating coupling device comprises an upper joint 1 and a lower joint 6 which are arranged up and down and are screwed, and is characterized in that an annular groove is formed in the inner wall of the upper joint 1, a breakable blind plate 2, a limiting ring 3 and a firing pin ring 4 are sequentially embedded in the annular groove from top to bottom, wherein the lower end face of the breakable blind plate 2 is tightly attached to the upper end face of the limiting ring 3, and a gap is reserved between the lower end face of the limiting ring 3 and the upper end face of the firing pin ring 4;
the ring surface of the striker ring 4 is inserted with a plurality of strikers 5 which can penetrate through the limit ring 3 to smash the breakable blind plate 2.
The breakable blind plate 2 is of a hemispherical hollow structure, a ball of the hollow hemisphere horizontally extends along the radial direction to the direction far away from the center of the ball to form a bottom edge, the bottom edge is inserted and embedded in the annular groove in a sealing manner, and the lower surface of the bottom edge is tightly attached to the upper end surface of the limiting ring 3;
with the opening of the hollow hemisphere facing the lower fitting 6.
The limiting ring 3 is a solid circular structure with thickness, the inner annular wall of the solid circular structure is provided with a plurality of needle passing channels 10 for the firing pin 5 to penetrate through, each needle passing channel 10 is the same in structure and is formed by inwards recessing the inner annular wall, the radial section of each needle passing channel is semicircular, and the central axis of each needle passing channel 10 is parallel to the central axis of the limiting ring 3.
A plurality of threaded holes are formed in the ring body of the limiting ring 3, the central axis of each threaded hole is perpendicular to the central axis of the limiting ring 3, a shear pin 7 is screwed in each threaded hole, and the tail thread end face of each shear pin 7 penetrates into the annular groove to be fixed and limited.
The needle passing channels 10 are evenly distributed on the inner annular wall of the limiting ring 3 at intervals, meanwhile, the shear pins 7 are evenly distributed on the ring body of the limiting ring 3 at intervals, and the needle passing channels 10 and the shear pins 7 are distributed at intervals.
The needle striking ring 4 is a solid ring body, the solid ring body is provided with a plurality of blind holes 11 for containing the firing pins 5, the central axis of the blind holes 11 is parallel to the central axis of the firing pin ring 4, one end of each firing pin 5 is inserted into the blind hole 11, the other end of each firing pin 5 is a sharp end, and the sharp end is positioned in the needle passing channel 10 or passes through the needle passing channel 10 to impact the breakable blind plate 2.
The inner wall of the lower end of the upper joint 1 is provided with an internal thread, the outer wall of the upper end of the lower joint 6 is provided with an external thread, the internal thread and the external thread are mutually screwed, the screwed part is provided with jackscrews 8 distributed at 180 degrees, and the jackscrews 8 penetrate through the upper joint 1 and are screwed into the lower joint 6;
wherein the striker ring 4 is seated on the upper end surface of the lower joint 6.
The screwing part of the upper joint 1 and the lower joint 6 is also provided with a sealing ring 9 sleeved on the lower joint 6, and the sealing ring 9 is positioned between the needle striking ring 4 and the jackscrew 8.
Fourth embodiment
The embodiment protects a preparation method of a breakable blind plate, wherein the breakable blind plate is a three-layer structure made of high borosilicate glass, and the high borosilicate glass comprises the following components:
80% of quartz sand;
10 percent of borax;
5% of boric acid;
3% of aluminum hydroxide;
2% of sodium chloride;
the outermost layer and the innermost layer in the three-layer structure are prepared by a 15MPa pressure blowing method, and the middle layer is prepared by a normal pressure rotary blowing method;
the breakable blind breaks into powder under the impact of the striker.
The three-layer structure is made of high borosilicate glass, and the difference is that the adopted process method is different, the outermost layer and the innermost layer are prepared by a 15MPa pressure blowing method, and the pressure-bearing strength is high, such as 33-55 MPa; the intermediate layer is prepared by a normal pressure blowing method, and has low pressure-bearing strength.
The outermost layer of glass is firstly contacted with the drilling fluid and is also firstly pressurized by the drilling fluid, so that high bearing pressure is required, when the highest bearing pressure is exceeded, the glass is cracked, and the bearing strength of the middle layer is lower than that of the outermost layer, so that the middle layer of glass is cracked almost simultaneously, and the next innermost layer of glass is cracked, namely the three layers of glass are crushed into powder layer by layer in the sequence of the outermost layer, the middle layer and the innermost layer in a short time, so that the safety is high.
Different from the traditional floating collar inner blind plate, the breakable blind plate of the embodiment adopts the high borosilicate glass with special components, the borax, the boric acid and the sodium chloride are added on the basis of the quartz sand and the aluminum hydroxide, the content of each component is determined through a plurality of tests, and the breakable blind plate is in a powder state instead of a particle state after being broken by combining different production processes with three-layer structures, so that the breakable blind plate can be completely discharged along with the liquid in the well.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. The breakable blind plate type floating coupling device comprises an upper joint (1) and a lower joint (6) which are arranged up and down and are connected in a screwed mode, and is characterized in that an annular groove is formed in the inner wall of the upper joint (1), a breakable blind plate (2), a limiting ring (3) and a needle striking ring (4) are sequentially embedded in the annular groove from top to bottom, wherein the lower end face of the breakable blind plate (2) is tightly attached to the upper end face of the limiting ring (3), a gap is reserved between the lower end face of the limiting ring (3) and the upper end face of the needle striking ring (4), and the limiting ring (3) is used for limiting the needle striking (5) and avoiding shaking;
the firing pin ring (4) is characterized in that a plurality of firing pins (5) which can penetrate through the limiting ring (3) to crush the breakable blind plate (2) are inserted into the ring surface of the firing pin ring (4), the firing pin ring (4) is a solid ring body, and a plurality of blind holes (11) used for accommodating the firing pins (5) are formed in the solid ring body.
2. The breakable blind plate type floating collar device according to claim 1, wherein the breakable blind plate (2) is a hemispherical hollow structure, the ball of the hollow hemisphere horizontally extends along the radial direction away from the center of the ball to form a bottom edge, the bottom edge is inserted and embedded in the annular groove in a sealing manner, and the lower surface of the bottom edge is tightly attached to the upper end surface of the limit ring (3);
wherein the opening of the hollow hemisphere faces the lower joint (6).
3. The breakable blind plate type floating collar device of claim 1, wherein the limiting ring (3) is a solid ring-shaped structure with thickness, the inner ring wall of the solid ring is provided with a plurality of needle passing channels (10) for the firing pin (5) to pass through, each needle passing channel (10) has the same structure, and is formed by inward recess of the inner ring wall, the radial section of each needle passing channel is semicircular, and the central axis of each needle passing channel (10) is parallel to the central axis of the limiting ring (3).
4. A breakable blind plate type floating coupling device according to claim 3, characterized in that the ring body of the limiting ring (3) is provided with a plurality of threaded holes, the central axis of the threaded holes is perpendicular to the central axis of the limiting ring (3), a shear pin (7) is screwed in each threaded hole, and the end face of the tail thread of the shear pin (7) extends into the annular groove to be fixed and limited.
5. A breakable blind plate type floating collar device according to claim 4, characterized in that several needle passing channels (10) are evenly distributed on the inner annular wall of the spacing ring (3) at intervals, several shear pins (7) are evenly distributed on the ring body of the spacing ring (3) at intervals, and the needle passing channels (10) and the shear pins (7) are distributed at intervals.
6. A breakable blind plate floating collar device according to claim 3 or 5, characterized in that the central axis of the blind hole (11) is parallel to the central axis of the firing pin ring (4), one end of each firing pin (5) is inserted into the blind hole (11) and the other end is a sharp end, which is located in the through-needle channel (10) or passes through the through-needle channel (10) to hit the breakable blind plate (2).
7. The breakable blind plate type floating collar device according to claim 1, wherein the inner wall of the lower end of the upper connector (1) is provided with internal threads, the outer wall of the upper end of the lower connector (6) is provided with external threads, the internal threads and the external threads are screwed together, the screwed part is provided with jackscrews (8) which are distributed at 180 degrees, and the jackscrews (8) penetrate through the upper connector (1) and are screwed into the lower connector (6);
wherein the needle striking ring (4) is seated on the upper end surface of the lower joint (6).
8. A breakable blind plate type floating collar device according to claim 7, characterized in that the screwed connection part of the upper joint (1) and the lower joint (6) is further provided with a sealing ring (9) sleeved on the lower joint (6), and the sealing ring (9) is positioned between the needle striking ring (4) and the jackscrew (8).
9. A method of using a breakable blind floating collar device, comprising at least the breakable blind floating collar device of any one of claims 1 to 8, the method comprising:
floating state
Connecting the breakable blind plate type floating coupling device in series to a sleeve string, wherein a closed space is formed between two adjacent breakable blind plates (2), the closed space forms an air bag filled with air, and the air bag drives the sleeve to float when the sleeve is in a well completion fluid;
crushed state
If the well is blocked, drilling fluid is injected into the casing string;
the drilling fluid is continuously pressurized to cut off all the shear pins (7), the breakable blind plate (2) pushes the limit ring (3) to move downwards to force the firing pin (5) to impact the breakable blind plate (2), and after the breakable blind plate (2) is broken, the circulating channel is reestablished in the casing string, so that subsequent well cementation construction operation can be carried out.
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| CN202011482660.XA CN112412342B (en) | 2020-12-15 | 2020-12-15 | Breakable blind plate type floating coupling device, using method and preparation method of blind plate |
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| CN202011482660.XA CN112412342B (en) | 2020-12-15 | 2020-12-15 | Breakable blind plate type floating coupling device, using method and preparation method of blind plate |
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| CN112412342B true CN112412342B (en) | 2023-03-07 |
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| CN115492552A (en) * | 2021-06-17 | 2022-12-20 | 中国石油化工股份有限公司 | Drilling-free oil removal casing temporary plugging nipple and application thereof |
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| CN201794527U (en) * | 2010-08-06 | 2011-04-13 | 安东石油技术（集团）有限公司 | Casing float collar |
| CN102373888A (en) * | 2010-08-06 | 2012-03-14 | 安东石油技术（集团）有限公司 | Sleeve floating coupling and well cementing method |
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| US20180202260A1 (en) * | 2013-02-05 | 2018-07-19 | Ncs Multistage Inc. | Casing float tool |
| CN109989725A (en) * | 2017-12-29 | 2019-07-09 | 中石化石油工程技术服务有限公司 | Exempt from brill formula blind plate and exempts to bore plug well shaft fixing technology |
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2020
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| US6397950B1 (en) * | 1997-11-21 | 2002-06-04 | Halliburton Energy Services, Inc. | Apparatus and method for removing a frangible rupture disc or other frangible device from a wellbore casing |
| CN201794527U (en) * | 2010-08-06 | 2011-04-13 | 安东石油技术（集团）有限公司 | Casing float collar |
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