CN115492550A

CN115492550A - Slip casting hole sealing device of hydraulic fracturing drilling in pit

Info

Publication number: CN115492550A
Application number: CN202211138017.4A
Authority: CN
Inventors: 辛利伟; 冀文韬
Original assignee: Luliang University
Current assignee: Luliang University
Priority date: 2022-09-19
Filing date: 2022-09-19
Publication date: 2022-12-20
Anticipated expiration: 2042-09-19
Also published as: CN115492550B

Abstract

The invention discloses a grouting and hole sealing device for underground hydraulic fracturing drilling, which comprises a fixed pipe, wherein the outer wall of the fixed pipe is provided with a plurality of arc-shaped partition plates, the outer wall of the fixed pipe between every two adjacent partition plates is respectively provided with a grout outlet, a rotating pipe is rotatably arranged in the fixed pipe, the upper end surface and the lower end surface of the fixed pipe are respectively provided with a plurality of petal-shaped supporting plates, the two adjacent supporting plates at the same end are vertically overlapped and attached, and the upper surface and the lower surface of each partition plate are respectively attached to the supporting plates. Compared with the prior art, the invention can enclose the drill holes with different sizes into a plurality of mutually closed spaces, and can carry out zonal grouting on the drill holes, thereby improving the permeability of mortar.

Description

Slip casting hole sealing device of hydraulic fracturing drilling in pit

Technical Field

The invention relates to the technical field of gas drilling and sealing, in particular to a grouting and sealing device for an underground hydraulic fracturing drill hole.

Background

The hydraulic fracturing technology is utilized in a mine to improve the gas extraction efficiency of a coal seam, a drill hole needs to be sealed before hydraulic fracturing, cement mortar is used for sealing the hole in the prior art, but due to the fact that cracks exist around the drill hole, in the drill hole with the larger diameter, due to the fact that the pumping pressure of the mortar is limited, the mortar cannot well penetrate into the cracks to form sealing within a certain range, and the sealing effect is poor.

Therefore, it is necessary to provide a grouting sealing device for a downhole hydraulic fracture borehole to solve the problems in the background art.

Disclosure of Invention

In order to achieve the purpose, the invention provides the following technical scheme: the grouting and hole sealing device comprises a fixed pipe, wherein the outer wall of the fixed pipe is provided with a plurality of arc-shaped partition plates, the outer wall of the fixed pipe between every two adjacent partition plates is respectively provided with a grout outlet, a rotating pipe is rotatably arranged in the fixed pipe, the upper end surface and the lower end surface of the fixed pipe are respectively provided with a plurality of petal-shaped supporting plates, two adjacent supporting plates at the same end are laminated in an up-and-down overlapping manner, and the upper surface and the lower surface of each partition plate are laminated with the supporting plates.

Further, it is preferable that a guide bar is fixed in the support plate, and the guide bar is rotatably coupled to the fixed pipe by a rotation pin.

Furthermore, as a preferred option, each rotating pin is sleeved with a supporting plate gear fixed to the corresponding guide strip, the supporting plate gear penetrates through the inner wall of the fixed pipe, the outer wall of the rotating pipe is provided with a gear ring, and the gear ring is meshed with the supporting plate gear.

Further, preferably, two adjacent guide bars are slidably connected together by a connecting bar.

Further, preferably, one side of the partition plate is rotatably connected to a side wall of the fixed pipe, a partition plate gear is fixed in a rotating shaft of the fixed pipe, the partition plate gear penetrates through an inner wall of the fixed pipe, and the gear ring is engaged with the partition plate gear.

Furthermore, preferably, the rotating pipe is provided with meshes which can be communicated with any grout outlet at the position corresponding to the grout outlet.

Further, as preferred, the intraductal slip casting pipe that can pull out to be equipped with of rotation, the lateral wall of slip casting pipe below has seted up interior grout outlet, slip casting pipe top can extend to subaerially.

Preferably, the inner wall of the rotating pipe is provided with an inclined ratchet groove, the outer wall of the grouting pipe is rotatably provided with a barrier strip, and the barrier strip provides torque for enabling the barrier strip to be far away from the outer wall of the grouting pipe through a torsion spring.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, when the radius of the supporting surface formed by the supporting plate is changed when the rotating pipe is rotated, the division plates synchronously rotate to open and close, and the opening radii of the division plates and the supporting plate are always kept the same, that is, when the supporting plate is attached to the drill holes with different sizes, the division plates are also synchronously attached to the drill holes, so that the supporting plate at the upper end and the lower end of the fixed pipe and two adjacent division plates can jointly enclose the drill holes with different sizes into a plurality of mutually closed spaces.

According to the invention, the inner grout outlet is sequentially aligned with one of the outer grout outlets when the grouting pipes are rotated, so that mortar in the grouting pipes can be injected out from the corresponding space to perform partition grouting in the drill holes, higher pressure can be provided for stratum cracks in the drill holes under the condition of limited grouting pressure, and the permeability of the mortar is improved.

Drawings

Fig. 1 is a structural schematic diagram of a grouting and hole sealing device for a downhole hydraulic fracturing drill hole;

FIG. 2 is a schematic structural view of a support plate;

FIG. 3 is a schematic view of the structure of the partition plate;

in the figure: 1. fixing the tube; 2. a partition plate; 21. a partition plate gear; 3. a grout outlet; 4. rotating the tube; 41. a ring gear; 42. mesh openings; 43. a ratchet groove; 5. a support plate; 51. a guide strip; 52. a rotation pin; 53. a support plate gear; 54. a connecting strip; 6. a grouting pipe; 61. an inner slurry outlet; 62. and (6) blocking strips.

Detailed Description

Referring to fig. 1, in an embodiment of the present invention, a grouting and hole sealing device for a downhole hydraulic fracturing drill hole includes a fixed pipe 1, the outer wall of the fixed pipe 1 is provided with a plurality of arc-shaped partition plates 2, the outer wall of the fixed pipe 1 between two adjacent partition plates 2 is respectively provided with a grout outlet 3, a rotating pipe 4 is rotatably arranged in the fixed pipe 1, the upper and lower end surfaces of the fixed pipe 1 are respectively provided with a plurality of petal-shaped support plates 5, two adjacent support plates 5 at the same end are vertically overlapped and attached, and the upper and lower surfaces of the partition plates 2 are attached to the support plates 5. That is, the support plate 5 at the upper and lower ends of the fixed pipe 1 and the two adjacent partition plates 2 can jointly enclose the inside of the drill hole into a plurality of mutually closed spaces.

Referring to fig. 2, in the present embodiment, a guide bar 51 is fixed in the support plate 5, and the guide bar 51 is rotatably connected to the fixed pipe 1 by a rotating pin 52. The bearing surface formed by the support plate 5 can be changed in radius by rotating the support plate 5 to seal bores of different sizes.

In this embodiment, each of the rotating pins 52 is sleeved with a supporting plate gear 53 fixed to the corresponding guide bar 51, the supporting plate gear 53 penetrates through the inner wall of the fixed pipe 1, the outer wall of the rotating pipe 4 is provided with a gear ring 41, and the gear ring 41 is engaged with the supporting plate gear 53. Each support plate 5 can be rotated synchronously by rotating the rotary tube 4.

In this embodiment, two adjacent guide bars 51 are slidably connected together by a connecting bar 54. So as to increase the interaction force and the fitting degree between the two supporting plates 5.

In this embodiment, one side of partition plate 2 is rotatably connected to the side wall of fixed pipe 1, partition plate gear 21 is fixed in the rotating shaft of fixed pipe 1, partition plate gear 21 penetrates through the inner wall of fixed pipe 1, and gear ring 41 is engaged with partition plate gear 21. When the supporting surface radius that backup pad 5 formed when rotatory rotating tube 4 changed, division board 2 synchronous rotation opened and shut, and made division board 2 remain the same with the radius that opens of backup pad 5 throughout, that is to say, when backup pad 5 laminated the drilling of equidimension not, division board 2 also laminated in this drilling in step, can enclose into a plurality of mutual confined spaces in the drilling of equidimension not jointly between two adjacent division boards 2 with backup pad 5 of fixed pipe 1 upper and lower extreme.

In this embodiment, the rotating pipe 4 is provided with a mesh 42 which can be communicated with any one of the grout outlet holes 3 at a position corresponding to the grout outlet hole 3.

In this embodiment, slip casting pipe 6 is arranged in rotating pipe 4 in a pluggable manner, inner slip outlet 61 is opened on the side wall below slip casting pipe 6, and the upper portion of slip casting pipe 6 can extend to the ground. That is to say, through aligning in proper order one of them play grout hole 3 in interior grout outlet 61 when rotating slip casting pipe 6, can make the mortar in slip casting pipe 6 pour out from the space that corresponds to carry out subregion slip casting in the drilling, make can provide higher pressure to the stratum fracture in the drilling under the condition of limited slip casting pressure, improve the infiltration ability of mortar.

In this embodiment, an inclined ratchet groove 43 is formed on the inner wall of the rotating tube 4, a barrier strip 62 is rotatably disposed on the outer wall of the grouting tube 6, and a torque for making the barrier strip 62 far away from the outer wall of the grouting tube 6 is provided in the barrier strip 62 through a torsion spring. That is, when the grouting pipe 6 rotates along the inclined direction of the ratchet groove 43, the grouting pipe 6 and the rotating pipe 4 can rotate with each other, and when the grouting pipe 6 rotates against the inclined direction of the ratchet groove 43, the blocking strip 62 is snapped into the ratchet groove 43 so that the torque of the grouting pipe 6 can be transmitted to the rotating pipe 4 to rotate the rotating pipe 4.

During specific implementation, the grouting pipe 6 is inserted into the rotating pipe 4, the fixed pipe 1 and the rotating pipe 4 are hung into a drill hole together for a preset depth, the grouting pipe 6 rotates against the inclination direction of the ratchet groove 43, the partition plate 2 and the support plate 5 are expanded into the embedded drill hole, mortar is injected into the grouting pipe 6, when the inner grout outlet hole 61 is aligned with one of the outer grout outlet holes 3, the mortar in the grouting pipe 6 can be injected out from a corresponding space and permeate into a stratum crack, the grouting pipe 6 is rotated along the inclination direction of the ratchet groove 43 to enable the inner grout outlet hole 61 to be sequentially aligned with each outer grout outlet hole 3 so as to perform grouting partition in the drill hole, and after grouting and hole sealing are completed, the grouting pipe 6 is drawn out and a hydraulic fracturing pipe is inserted into the rotating pipe 4 to perform fracturing on the stratum.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. The utility model provides a slip casting hole sealing device of hydraulic fracturing drilling in pit, includes fixed pipe (1), its characterized in that, fixed pipe (1) outer wall is equipped with multi-disc curved division board (2), adjacent two fixed pipe (1) outer wall between division board (2) has respectively seted up out thick liquid hole (3), rotationally be equipped with rotating tube (4) in fixed pipe (1), the terminal surface all is equipped with backup pad (5) of multi-disc petal shape about fixed pipe (1), laminates with overlapping from top to bottom with two backup pads (5) adjacent with the one end, just the upper and lower face of division board (2) all laminates with backup pad (5).

2. A downhole hydraulic fracture drilling grouting and sealing device according to claim 1, characterized in that a guide strip (51) is fixed in the support plate (5), and the guide strip (51) is rotatably connected to the fixed pipe (1) through a rotating pin (52).

3. The grouting and sealing device for the hydraulic fracturing borehole in the pit according to claim 2, characterized in that each rotating pin (52) is sleeved with a supporting plate gear (53) fixed in the corresponding guide strip (51), the supporting plate gear (53) penetrates through the inner wall of the fixed pipe (1), the outer wall of the rotating pipe (4) is provided with a gear ring (41), and the gear ring (41) is meshed with the supporting plate gear (53).

4. A downhole hydraulic fracture drilling grouting and sealing device according to claim 2, characterized in that two adjacent guide strips (51) are slidably connected together through a connecting strip (54).

5. A grouting and sealing device for a hydraulic fracturing borehole in a well according to claim 3, characterized in that one side of the divider (2) is rotatably connected to the side wall of the fixed pipe (1), a divider gear (21) is fixed in the rotating shaft of the fixed pipe (1), the divider gear (21) penetrates through the inner wall of the fixed pipe (1), and the gear ring (41) is meshed with the divider gear (21).

6. The grouting and sealing device for the hydraulic fracturing borehole in the pit according to claim 1, characterized in that the rotating pipe (4) is provided with meshes (42) which can be communicated with any one of the grout outlet holes (3) at the positions corresponding to the grout outlet holes (3).

7. The grouting hole sealing device for the underground hydraulic fracture drilling hole as claimed in claim 1, wherein a grouting pipe (6) is arranged in the rotating pipe (4) in a pluggable manner, an inner grout outlet (61) is formed in the side wall below the grouting pipe (6), and the upper part of the grouting pipe (6) can extend to the ground.

8. The grouting and sealing device for the hydraulic fracturing borehole of the underground according to claim 7, characterized in that the inner wall of the rotating pipe (4) is provided with an inclined ratchet groove (43), the outer wall of the grouting pipe (6) is rotatably provided with a baffle (62), and the baffle (62) provides torque for keeping the baffle (62) away from the outer wall of the grouting pipe (6) through a torsion spring.