CN108331551B - Selective plugging tool and method for plugging tubular column by using same - Google Patents
Selective plugging tool and method for plugging tubular column by using same Download PDFInfo
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- CN108331551B CN108331551B CN201810141149.XA CN201810141149A CN108331551B CN 108331551 B CN108331551 B CN 108331551B CN 201810141149 A CN201810141149 A CN 201810141149A CN 108331551 B CN108331551 B CN 108331551B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000000903 blocking effect Effects 0.000 claims abstract description 54
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 230000009466 transformation Effects 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 230000007704 transition Effects 0.000 claims description 23
- 210000004907 gland Anatomy 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000010408 sweeping Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012360 testing method Methods 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
- E21B33/12—Packers; 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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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 utility model provides a selective plugging tool and a method for plugging a pipe column thereof, wherein the selective plugging tool consists of a plugging body and a receiving body, after the plugging body is put into the pipe column, a groove at the lower end of the plugging body is matched with a spherical bulge on the inner wall of the receiving body, after the plugging body is manufactured by the receiving body, the plugging body is matched with the receiving body into a whole, the upper pipe fitting cavity and the lower pipe fitting cavity of the assembly are isolated, a sealing element of the plugging body is pressed due to the pressure generated by upper fluid, an upper port is expanded, the outer diameter is increased to further seal an annular space, the fluid is prevented from passing through, and a pressure difference is formed between the upper part and the lower part of the plugging body, so that the plugging of a transformation section where the receiving body is completed. The utility model adopts liquid pumping, has simple running and self-setting, does not need other tools carried by a cable to assist the running and setting, has high construction efficiency, and is convenient for the oil-gas well to realize quick multi-section fracturing of the optical sleeve. And the outer diameter of the steel body of the blocking body is always smaller than the inner diameter of the sleeve, and the later-stage pit shaft plug sweeping treatment is simple.
Description
Technical Field
The utility model belongs to the technical field of fracturing reformation of oil and gas fields, and particularly relates to a selective plugging tool and a plugging method thereof.
Background
At present, multi-layer multi-section fracturing layers (sections) of an oil and gas well optical sleeve are sealed and isolated mainly by bridge plugs, the bridge plugs need to carry perforating gun strings, setting tools are put down by cables, straight well sections (well deviation is less than or equal to 30 degrees) are put down by means of self gravity of the tools, highly inclined sections (well deviation is more than 30 degrees) are pushed to a design position by adopting a hydraulic pumping mode, and the gunpowder seat bridge plugs are started. The outer diameter of the bridge plug after setting is larger than the inner diameter of the sleeve. The field test shows that the process pipe column is complex, and relates to high-risk links such as cable running-in, gunpowder setting and the like, and the probability of bridge plug setting failure is high. And after setting, the bridge plug is anchored on the wall of the tubular column by means of slips, and drilling, grinding or other modes are needed in the later stage, so that the difficulty in treating the shaft is high.
Disclosure of Invention
The utility model aims to solve the problems of complex plugging process and high failure probability of a bridge plug adopted in the existing oil-gas well packing.
The utility model provides a selective plugging tool, which comprises a plugging body and a receiving body, wherein a plurality of strip-shaped grooves are uniformly arranged at intervals along the circumferential direction at the lower end of the plugging body, the length direction of each strip-shaped groove is axially arranged along the plugging body, the receiving body is a cylindrical body with two ends open, a plurality of spherical protrusions are uniformly arranged at intervals along the circumferential direction on the inner wall of the receiving body, the distance between two adjacent spherical protrusions is equal to the distance between two adjacent strip-shaped grooves, after the plugging body is put into an oil-gas well tubular column, the plugging body is clamped into the receiving body, and the strip-shaped grooves are lowered along the spherical protrusions until the plugging body and the receiving body are clamped into a whole to isolate the upper cavity and the lower cavity of the tubular column.
The strip-shaped groove comprises a vertical channel section, a transition clamping groove section, a righting groove section and a seating guide rail section from top to bottom, wherein the transition clamping groove section is splayed and connected to the lower end of the vertical channel section, the righting groove section is II-shaped and connected to the lower end of the transition clamping groove section, and the seating guide rail section is I-shaped and connected to the lower end of the righting groove section.
The blocking body is composed of a gland, a sealing element and a limiting seat from top to bottom, the gland is tightly sleeved at the top end of the limiting seat, the sealing element is sleeved on the limiting seat in a penetrating mode, and the limiting seat is clamped and sealed with the receiving body.
The limiting seat is of a columnar structure with gradually stepped diameter reduction from top to bottom, the diameter reduction part of the limiting seat is provided with an upper part and a middle part, the gland is sleeved at the diameter reduction part of the upper part in a pressing mode, the sealing element is sleeved at the diameter reduction part of the middle part in a penetrating mode, the top of the sealing element is contacted with the bottom end of the gland, the bottom end of the sealing element is arranged on a step at the diameter reduction part of the middle part in a sitting mode, and the strip-shaped groove is formed in the limiting seat.
Sealing rings are respectively arranged among the gland, the sealing piece and the limiting seat.
The sealing element is made of bowl-shaped rubber, the bowl base is arranged on a step at the middle diameter reduction part of the limiting seat, a gap is reserved between the inner wall of the bowl opening and the outer wall of the limiting seat, and the size of the gap is suitable for enabling the sealing element to shrink until the outer diameter of the sealing element is smaller than the drift diameter of the receiving body when the blocking body moves downwards.
The groove depth of the strip-shaped groove is larger than the radius of the spherical bulge of the receiving body, and the bottom of the sitting guide rail section is provided with a round angle.
A method for selectively plugging a tubular string with a plugging tool, comprising the steps of: step one, assembling a fracturing reconstruction tubular column, wherein a plurality of receivers are uniformly connected in series at intervals from top to bottom among the tubular column, each receiver corresponds to a fracturing reconstruction section, and the diameters of spherical protrusions in the receivers are sequentially increased from top to bottom;
step two, a fracturing modification tubular column is put down into an oil-gas well shaft to be fractured;
sequentially inputting the blocking bodies into the fracturing transformation tubular column by adopting hydraulic pumping, wherein the diameters of the vertical channel sections of the sequentially input blocking bodies are sequentially increased corresponding to the diameters of spherical protrusions, and the minimum width of the transition clamping groove sections of the blocking bodies corresponding to the receiving bodies is smaller than the diameter of the spherical protrusions inside the receiving bodies at the same level;
step four, the input blocking body moves downwards to reach the corresponding level of receiving body, the blocking body is guided by the seating guide rail section, the spherical surface bulge in the receiving body moves downwards to the transition clamping groove section, the pressure generated by the fluid at the upper part of the blocking body presses the sealing element, the bowl mouth end of the sealing element expands, the outer diameter is increased, thereby sealing the oil jacket annulus, preventing the fluid from passing through and forming pressure difference on the upper side and the lower side of the blocking body, isolating the upper cavity and the lower cavity of the fracturing transformation pipe column, and completing the packing of the fracturing transformation section at the corresponding position of the receiving body;
and fifthly, repeating the fourth step, and completing multi-section packing from bottom to top.
The utility model has the beneficial effects that: the selective plugging tool and the method for plugging the pipe column thereof provided by the utility model adopt liquid pumping, are simple to lower, are self-setting, do not need to carry other tools with cables to assist to lower and set, have high construction efficiency, and are convenient for an oil gas well to realize quick multistage fracturing of the optical casing. And the outer diameter of the steel body of the blocking body is always smaller than the inner diameter of the sleeve, and the later-stage pit shaft plug sweeping treatment is simple.
The present utility model will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a plug structure.
Fig. 2 is a cross-sectional view of a occluding body.
Fig. 3 is a schematic cross-sectional view of a receiver.
Fig. 4 is a top view of a receiver.
Fig. 5 is a schematic view of the trajectory of the spherical protrusion of the receiver body into the occluding body and preventing the occluding body from passing.
Fig. 6 is a schematic view of the trajectory of a receiver sphere protrusion into and through a occluding body.
Reference numerals illustrate: 1. a gland; 2. a seal; 3. a limiting seat; 4. a receiving body; 5. a blocking body; 301 a vertical channel section; 302. a transition clamping groove section; 303. centralizing the groove section; 304. a seating guide rail section; 401. spherical surface bulge.
Detailed Description
Example 1:
as shown in fig. 1 and fig. 3, this embodiment provides a selective plugging tool, including a plugging body 5 and a receiving body 4, a plurality of bar grooves are uniformly spaced along the circumferential direction at the lower end of the plugging body 5, the length direction of the bar grooves is axially arranged along the plugging body 5, as shown in fig. 3 and fig. 4, the receiving body 4 is a cylindrical body with two open ends, a plurality of spherical protrusions 401 are uniformly spaced along the circumferential direction at the inner wall of the receiving body, the distance between two adjacent spherical protrusions 401 is equal to the distance between two adjacent bar grooves, after the plugging body 5 is put into an oil-gas well pipe column, the plugging body 5 is clamped into the receiving body 4, the bar grooves descend along the spherical protrusions 401 until the plugging body 5 and the receiving body 4 are clamped into a whole to isolate the upper cavity and the lower cavity of the pipe column.
The spherical protrusion 401 is used to determine whether the blocking body 5 flowing through is to continue to pass or stop at the receiving body 4. The protrusions of the spherical protrusions 401 are spherical and the number of the protrusions is variable, and the protrusions are determined according to the diameter of the spherical surface of the protrusions and the maximum pressure difference between the upper cavity and the lower cavity of the plugging position to be born. The number and the size of the strip-shaped grooves of the blocking body and the spherical protrusions of the receiving body can be changed according to the size of the connecting pipe fitting and the pressure difference between the upper cavity and the lower cavity of the blocking body during application.
The application method of the selective plugging tool provided by the embodiment is as follows:
assembling a fracturing reconstruction tubular column, uniformly and alternately connecting a plurality of receiving bodies 4 in series between the tubular column from top to bottom, wherein each receiving body 4 corresponds to a fracturing reconstruction section, and the diameters of spherical protrusions 401 in the receiving bodies 4 are sequentially increased from top to bottom; lowering a fracturing modification tubular column into an oil and gas well shaft to be fractured; and the hydraulic pump is adopted to sequentially throw the blocking bodies 5 into the fracturing transformation pipe column, the thrown blocking bodies 5 move downwards to reach the corresponding-stage receiving bodies 4, the receiving bodies 4 brake the blocking bodies 5, the blocking bodies 5 are matched with the receiving bodies 4 after stopping, the upper cavity and the lower cavity of the fracturing transformation pipe column are isolated, and the fluid is prevented from passing through and forming pressure difference on the upper side and the lower side of the blocking bodies 5. In this way, a series of blocking bodies 5 are thrown down, so that multi-stage sealing can be completed from bottom to top.
Example 2:
on the basis of embodiment 1, as shown in fig. 1 and 2, the strip-shaped groove is composed of a vertical channel section 301, a transition clamping groove section 302, a righting groove section 303 and a seating guide rail section 304 from top to bottom, wherein the transition clamping groove section 302 is connected to the lower end of the vertical channel section 301 in a splayed shape, the righting groove section 303 is connected to the lower end of the transition clamping groove section 302 in a splayed shape, and the seating guide rail section 304 is connected to the lower end of the righting groove section 303 in a/-shape.
The number of the strip-shaped grooves is the same as that of the spherical protrusions 401 regularly distributed on the inner wall of the receiving body 4, and the strip-shaped grooves comprise a vertical channel section 301, a transition clamping groove section 302, a centralizing groove section 303 and a seating guide rail section 304 and are used for determining whether a blocking body can be communicated. The groove depth of the strip-shaped groove is larger than the spherical protrusion radius of the receiving component. The diameter of the transition clamping groove section 302 is larger than the diameter of the vertical channel section 301. The diameter of the righting groove section 303 is larger than that of the transition clamping groove section 302, so that the spherical protrusion 401 of the receiving body 4 can conveniently enter the blocking body groove quickly. The arc-shaped groove of the lower seating guide rail section 304 is positioned in the same side direction of the groove, is circumferentially unfolded around the blocking body 5, is connected with the side of the same side centralizing groove, is rounded at the bottom and is used for receiving the spherical protrusion of the assembly to quickly enter the groove of the blocking body. As shown in fig. 5, when the diameter at the transition clamping groove section 302 is smaller than or equal to the diameter of the spherical projection 401 of the inner wall of the receiving assembly, the blocking body 5 cannot pass; as shown in fig. 6, when the diameter at the transition clamping groove section 302 is larger than the diameter of the spherical projection 401 of the inner wall of the receiving member, the blocking body 5 passes through the receiving member.
Example 3:
on the basis of the embodiment 1 or 2, as shown in fig. 1 or 2, the blocking body 5 is composed of a gland 1, a sealing element 2 and a limiting seat 3 from top to bottom, the gland 1 is tightly sleeved at the top end of the limiting seat 3, the sealing element 2 is sleeved on the limiting seat 3 in a penetrating way, and the limiting seat 3 is clamped and sealed with the receiving body 4. The sealing element 2 is used for blocking the gap between the blocking body 5 and the receiving element 4 when the blocking body 5 stops at the receiving element 4, preventing the liquid flow from up to down of the pipe cavity, and the wall thickness is designed according to the material property so as to be easy to select in a numerical range that the outer diameter can be further enlarged when the upper part of the sealing element 2 is stressed.
Example 4:
on the basis of embodiment 3, as shown in fig. 2, preferably, the limiting seat 3 has a columnar structure with gradually stepped diameter reduction from top to bottom, the diameter reduction part of the limiting seat has two parts, namely an upper part and a middle part, the gland 1 is sleeved at the upper diameter reduction part, the sealing element 2 is sleeved at the middle diameter reduction part in a penetrating way, the top of the sealing element 2 is contacted with the bottom end of the gland 1, the bottom end of the sealing element 2 is seated on the step at the middle diameter reduction part, and the strip-shaped groove is arranged on the limiting seat 3.
Example 5:
on the basis of embodiment 3, in order to achieve the best sealing effect, sealing rings are respectively arranged among the gland 1, the sealing element 2 and the limiting seat 3.
Example 6:
on the basis of embodiment 4, the sealing member 2 is made of bowl-shaped rubber, the bowl is seated on a step at the reduced diameter position in the middle of the limiting seat 3, a gap is reserved between the inner wall of the bowl and the outer wall of the limiting seat 3, and the gap is sized so that when the blocking body 5 moves downwards, the sealing member 2 can shrink to an outer diameter smaller than the drift diameter of the receiving body 4. For example, the sealing member 2 is made of hydrogenated nitrile, the outer diameter of the upper portion is 128mm, the wall thickness is 8mm, the gap between the sealing member 2 and the rod of the inner limiting seat 3 is 3.4mm, and the outer diameter of the lower portion is 115mm.
Example 7:
on the basis of embodiment 2, in order to facilitate the spherical protrusion 401 of the receiving body 4 to quickly enter the bar-shaped groove of the blocking body 5, the groove depth of the bar-shaped groove is larger than the radius of the spherical protrusion 401 of the receiving body 4, and the bottom of the seating guide rail section 304 is rounded.
Example 8:
a method for selectively plugging a tubular string with a plugging tool, comprising the steps of: step one, assembling a fracturing transformation tubular column, uniformly connecting a plurality of receiving bodies 4 in series at intervals from top to bottom among the tubular column, wherein each receiving body 4 corresponds to a fracturing transformation section, and the diameters of spherical protrusions 401 in the receiving bodies 4 are sequentially increased from top to bottom; step two, a fracturing modification tubular column is put down into an oil-gas well shaft to be fractured; sequentially inputting the blocking bodies 5 into the fracturing transformation tubular column by adopting hydraulic pumping, wherein the diameters of the vertical channel sections 301 of the sequentially-input blocking bodies 5 are sequentially increased corresponding to the diameters of the spherical protrusions 401, and the minimum width of the transition clamping groove sections 302 of the blocking bodies 5 corresponding to the receiving bodies 4 is smaller than the diameter of the spherical protrusions 401 in the same-level receiving bodies 4; step four, the input blocking body 5 moves downwards to reach the corresponding-stage receiving body 4, the blocking body 5 is led in through the seating guide rail section 304 and moves downwards continuously, the spherical protrusion 401 in the receiving body 4 moves to the transition clamping groove section 302, the pressure generated by fluid at the upper part of the blocking body 5 causes the sealing element 2 to be pressed, the bowl mouth end of the sealing element 2 expands, the outer diameter is increased, thereby sealing an oil sleeve annulus, preventing the fluid from passing through and forming pressure difference on the upper side and the lower side of the blocking body 5, isolating the upper cavity and the lower cavity of the fracturing transformation pipe column, and completing the sealing of the fracturing transformation section at the corresponding part of the receiving body 4; and fifthly, repeating the fourth step, and completing multi-section packing from bottom to top.
In the embodiment, multi-section packing is performed in a fracturing reconstruction tubular column with the path of 121.36mm according to the method of the steps, and specific parameters are as follows: the receiving body 4 is connected between the pipe fittings and comprises spherical protrusions 401 with the diameter phi 6mm and the diameter 116mm, wherein the spherical protrusions are uniformly distributed on the inner wall 4.
The occluding body 5 comprises an upper gland 1, a middle seal 2 and a lower restriction seat 3. Wherein two sealing rings are respectively arranged among the upper gland 1, the middle sealing element 2 and the lower limiting seat 3 to seal the inside of the plug body. The outer diameter of the limiting seat 3 is 120mm,4 strip-shaped grooves are circumferentially and uniformly distributed, the groove depth is 6mm, the diameter of the vertical channel section 301 is 4mm, the transitional clamping groove section 302 phi is 6mm, the diameter of the centralizing groove section 303 is 8mm, and the circular arc diameter of the seat guide rail section 304 is 20mm. When the blocking body 5 flows through the receiving body 4, the blocking body 5 is guided to turn through the seating guide rail section 304, so that the four spherical protrusions 401 all pass through the centralizing groove section 303 and reach the transitional clamping groove section 302 to be clamped, and the blocking body 5 stops moving downwards. The sealing element 2 adopts the hydrogenated nitrile, the outer diameter of the upper part is 128mm, the wall thickness is 8mm, the gap between the sealing element and the inner limiting seat rod is 3.4mm, and the outer diameter of the lower part is 115mm.
In the above steps, referring specifically to fig. 5, during use, a plurality of receiving bodies 4 are arranged between the pipe fittings to form a system, the diameters of the inner spherical protrusions 401 of the receiving bodies 4 downward from the upper ends of the pipe fittings are sequentially increased, the diameters of the vertical channel sections 301 of the limiting seats 3 corresponding to the blocking bodies 5 sequentially thrown from the upper ends of the pipe fittings are sequentially correspondingly increased, and the diameters of the transition clamping groove sections 302 corresponding to the receiving bodies 4 are the same as the diameters of the inner spherical protrusions 401 of the receiving bodies 4 at the same level. The plug 5 is thrown into the well from the upper end of the pipe, the plug 5 moves downwards, reaches the corresponding level of the receivers 4 through a series of receivers 4 with smaller diameters than the vertical channel section 301 as shown in fig. 6, is guided in through the seating guide rail section 304, the plug 5 moves downwards continuously, the characteristic structure (spherical protrusion 401) of the receivers 4 moves to the transition clamping groove section 302, and the plug 5 stops moving downwards continuously due to the fact that the diameter is larger than the diameter of the upper vertical channel section 301, as shown in fig. 5, the sealing element is pressed due to the pressure generated by the upper fluid, the upper end expands, the outer diameter increases, the annular space is sealed, and the fluid is prevented from passing through and forming a pressure difference on the upper side and the lower side of the plug. In this way, a series of blocking bodies are thrown down in the same action, so that multi-section packing can be completed from bottom to top.
It should be noted that, in fig. 5 and fig. 6, the spherical protrusions 401,1 to 9 of the receiving body 4 are marked 1, 2, 3, 4, 5, 6, 7, 8, and 9 in the circles in the bar-shaped grooves, and the track of the spherical protrusion 401 passing through the bar-shaped grooves.
The foregoing examples are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model, and all designs that are the same or similar to the present utility model are within the scope of the present utility model. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.
Claims (5)
1. A selective plugging tool, characterized in that: the oil and gas well plugging device comprises a plugging body (5) and a receiving body (4), wherein a plurality of strip-shaped grooves are uniformly formed in the lower end of the plugging body (5) at intervals along the circumferential direction, the length direction of each strip-shaped groove is axially arranged along the plugging body (5), the receiving body (4) is a cylindrical body with two ends open, a plurality of spherical protrusions (401) are uniformly formed in the inner wall of the receiving body at intervals along the circumferential direction, the distance between two adjacent spherical protrusions (401) is equal to the distance between two adjacent strip-shaped grooves, after the plugging body (5) is put into an oil and gas well pipe column, the plugging body is clamped into the receiving body (4), the strip-shaped grooves descend along the spherical protrusions (401) until the plugging body (5) and the receiving body (4) are clamped into a whole, and then upper cavity and lower cavity of the pipe column are isolated;
the blocking body (5) consists of a gland (1), a sealing piece (2) and a limiting seat (3) from top to bottom, the gland (1) is tightly sleeved at the top end of the limiting seat (3), the sealing piece (2) is sleeved on the limiting seat (3) in a penetrating way, and the limiting seat (3) is clamped and sealed with the receiving body (4);
sealing rings are respectively arranged among the gland (1), the sealing piece (2) and the limiting seat (3);
the limiting seat (3) is of a columnar structure with gradually stepped diameter reduction from top to bottom, the diameter reduction part of the limiting seat is provided with an upper part and a middle part, the gland (1) is sleeved at the diameter reduction part of the upper part, the sealing element (2) is sleeved at the diameter reduction part of the middle part in a penetrating way, the top of the sealing element (2) is contacted with the bottom end of the gland (1), the bottom end of the sealing element (2) is seated on a step at the diameter reduction part of the middle part, and the strip-shaped groove is formed in the limiting seat (3).
2. The selective occlusion tool of claim 1, wherein: the strip-shaped groove is formed by a vertical channel section (301), a transition clamping groove section (302), a righting groove section (303) and a seating guide rail section (304) from top to bottom, the transition clamping groove section (302) is connected to the lower end of the vertical channel section (301) in a splayed shape, the righting groove section (303) is connected to the lower end of the transition clamping groove section (302) in a splayed shape, and the seating guide rail section (304) is connected to the lower end of the righting groove section (303) in a splayed shape.
3. The selective occlusion tool of claim 1, wherein: the sealing element (2) is made of bowl-shaped rubber, a bowl base is arranged on a step at the middle diameter reduction part of the limiting seat (3), a gap is reserved between the inner wall of the bowl opening and the outer wall of the limiting seat (3), and the size of the gap is suitable for enabling the sealing element (2) to shrink until the outer diameter is smaller than the diameter of the receiving body (4) when the blocking body (5) moves downwards.
4. The selective occlusion tool of claim 2, wherein: the groove depth of the strip-shaped groove is larger than the radius of the spherical protrusion (401) of the receiving body (4), and the bottom of the sitting guide rail section (304) is rounded.
5. A method for plugging a pipe column by using a selective plugging tool, which is applied to the selective plugging tool as set forth in claim 2 or 4, and is characterized by comprising the following steps:
step one, assembling a fracturing transformation tubular column, uniformly connecting a plurality of receiving bodies (4) in series at intervals from top to bottom among the tubular column, wherein each receiving body (4) corresponds to a fracturing transformation section, and the diameters of spherical bulges (401) in the receiving bodies (4) are sequentially increased from top to bottom;
step two, a fracturing modification tubular column is put down into an oil-gas well shaft to be fractured;
sequentially inputting the blocking bodies (5) into the fracturing transformation tubular column by adopting hydraulic pumping, wherein the diameters of the vertical channel sections (301) of the sequentially-input blocking bodies (5) are sequentially increased corresponding to the diameters of the spherical protrusions (401), and the minimum width of the transition clamping groove sections (302) of the blocking bodies (5) corresponding to the receiving bodies (4) is smaller than the diameter of the spherical protrusions (401) inside the same-level receiving bodies (4);
step four, the input blocking body (5) moves downwards to reach the corresponding level of the receiving body (4), the blocking body (5) moves downwards continuously through the guide rail section (304), the spherical bulge (401) in the receiving body (4) moves to the transition clamping groove section (302), the pressure generated by the fluid at the upper part of the blocking body (5) enables the sealing element (2) to be pressed, the bowl mouth end of the sealing element (2) expands, the outer diameter increases, the annular space of the oil jacket is sealed, the fluid is prevented from passing through, the pressure difference is formed between the upper part and the lower part of the blocking body (5), the upper cavity and the lower cavity of the fracturing transformation pipe column are isolated, and the sealing of the fracturing transformation section at the corresponding position of the receiving body (4) is completed;
and fifthly, repeating the fourth step, and completing multi-section packing from bottom to top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141149.XA CN108331551B (en) | 2018-02-11 | 2018-02-11 | Selective plugging tool and method for plugging tubular column by using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141149.XA CN108331551B (en) | 2018-02-11 | 2018-02-11 | Selective plugging tool and method for plugging tubular column by using same |
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| Publication Number | Publication Date |
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| CN108331551A CN108331551A (en) | 2018-07-27 |
| CN108331551B true CN108331551B (en) | 2023-08-22 |
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| CN201810141149.XA Active CN108331551B (en) | 2018-02-11 | 2018-02-11 | Selective plugging tool and method for plugging tubular column by using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109681147A (en) * | 2019-01-15 | 2019-04-26 | 中国石油集团川庆钻探工程有限公司 | A kind of horizontal well reservoir selective shut-off method |
| CN110924903B (en) * | 2019-12-06 | 2021-09-28 | 中国石油集团渤海钻探工程有限公司 | Selective plugging process pipe column for screen pipe well completion |
| CN112325956A (en) * | 2020-10-12 | 2021-02-05 | 南京中宇自动化有限公司 | Induction type high-temperature gas-solid two-phase flow measuring instrument and measuring method thereof |
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| CN108331551A (en) | 2018-07-27 |
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