Hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device

Abstract

The present invention discloses a hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device, which includes a barrel, a dual-path sealing mechanism, a horizontal rotation mechanism, a base platform and a base platform height adjustment structure; the present invention device can realize the lifting and lowering of the base platform through the synchronous lifting of the front and rear adjustable hinges at the bottom of the base platform, realize the front and rear tilting of the seat platform through the differential lifting of the front and rear adjustable hinge mechanisms, realize the plane rotation of the barrel through the rotation of the horizontal rotation mechanism, realize the front and rear movement of the barrel through the relative movement of the base platform base and the base platform movable platform, and realize the three-degree-of-freedom adjustment of the orifice device. The device of the present invention is convenient for the loading and unloading of the oil pipe and the re-sealing after loading and unloading, and the device can also well adapt to the special working environment underground.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic fracturing in coal mines, and in particular relates to a three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device for a hydraulic fracturing horizontal casing hole. Background Art

[0002] The hydraulic fracturing drilling holes in coal mines are horizontal holes, and the orifice device cannot be directly installed horizontally. The high-pressure resistant orifice device has a large weight, and it is difficult to adjust the angle for installation. In addition, the ordinary orifice is not conducive to achieving dual-path high-pressure sealing, which makes it difficult to implement the process technology methods related to casing fracturing. The horizontal hole orifice first requires a special support mechanism, which not only supports and stabilizes the orifice device, but also needs to be able to easily adjust the hole. At the same time, it is necessary to consider the realization of large-displacement dual-channel high-pressure sealing functions, and facilitate the loading and unloading of the oil pipe and the re-sealing after loading and unloading. At the same time, the orifice device also needs to be able to adapt to the special working environment underground (limited space and site, etc.). Summary of the invention

[0003] In response to the above technical requirements, the present invention proposes a three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device for a fixed hydraulic fracturing horizontal casing hole, which realizes the fast and flexible support and dual-path high-pressure sealing of the hydraulic fracturing drilling orifice device in coal mines.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The invention discloses a hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device, the device comprising a barrel, a dual-path sealing mechanism, a horizontal rotating mechanism, a base platform and a base platform height adjustment structure;

[0006] One end of the cylinder is sealed by a double-channel sealing mechanism, and the other end is open. When the oil pipe is inserted into the cylinder, the double-channel sealing mechanism isolates and seals the annular passages inside and outside the oil pipe from each other.

[0007] The base platform comprises a base platform pedestal and a base platform movable platform, the base platform movable platform is connected to the base platform pedestal via a slide rail, and the base platform movable platform can move forward and backward on the base platform pedestal;

[0008] The cylinder is connected to the horizontal rotating mechanism, and the cylinder is driven to rotate in a plane through the horizontal rotating mechanism; the horizontal rotating mechanism is connected to the base platform moving platform;

[0009] The base platform height adjustment mechanism comprises a base and a plurality of adjustable hinges arranged on the base; each adjustable hinge comprises four hinge arms and a bidirectional tensioning chain rod, wherein every two hinge arms are hinged to form a group of connecting rods, and the two ends of the bidirectional tensioning chain rod are respectively connected to the hinges of the two hinge arms in the two groups of connecting rods, and the bidirectional tensioning chain rod is tightened or stretched to bring the hinges of the hinge arms of the two groups of connecting rods closer or farther away;

[0010] The multiple adjustable hinge pairs are distributed on both sides of the base platform pedestal, the connection between the base and the hinge arm is hinged, one side of the base platform pedestal and the hinge arm are hinged, and the other side of the base platform pedestal is connected to the hinge arm through a T-frame, wherein the flange portion of the T-frame is hinged to the hinge arm, and the web portion of the T-frame is hinged to the base platform pedestal.

[0011] Preferably, the dual-channel sealing mechanism includes a sealing seat, a sealing nipple and a pressure cover, the sealing seat is provided with a through hole, one end of the sealing seat is connected to the cylinder, the through hole is communicated with the inner cavity of the cylinder, and the other end of the sealing seat is connected to the pressure cover; the sealing nipple is clamped between the openings of the pressure cover and the sealing seat, and the sealing nipple can block the through hole, and the sealing nipple is provided with a liquid passage communicated with the through hole; the pressure cover is provided with a hollow opening for the external oil pipe to pass through.

[0012] Preferably, the open end of the cylinder is connected to the orifice casing through a four-way connection, and the other two ends of the four-way connection are arranged as a high-pressure and extraction passage and a high-pressure and slag discharge passage.

[0013] Preferably, the horizontal rotation mechanism includes a horizontal rotation bearing, a horizontal rotation support and a horizontal rotation limiting track, the fixed end of the horizontal rotation bearing is connected to the base platform moving platform, and the rotating end of the horizontal rotation bearing is connected to the cylinder; the horizontal rotation support is arranged on the cylinder, and the horizontal rotation limiting track is arranged on the base platform moving platform.

[0014] Preferably, the horizontal rotation mechanism also includes a limit stopper for limiting the rotation of the cylinder.

[0015] Preferably, a pitch-adjusting gear is arranged on the base platform, and a pitch-adjusting rack matching with the pitch-adjusting gear is arranged on the movable platform of the base platform.

[0016] Preferably, a tension chain rod box is provided on the bidirectional tension chain rod, and an adjusting knob is provided on the tension chain rod box, and the bidirectional tension chain rod can be tightened or stretched by rotating the adjusting knob.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The device of the present invention can realize the lifting and lowering of the base platform by synchronously lifting and lowering the front and rear adjustable hinges at the bottom of the base platform, realize the front and rear tilting of the seat platform by differential lifting and lowering of the front and rear adjustable hinge mechanisms, realize the plane rotation of the cylinder by rotating the horizontal rotating mechanism, realize the front and rear movement of the cylinder by relative movement of the base platform base and the base platform movable platform, and realize the three-degree-of-freedom adjustment of the orifice device. By combining the dual-path sealing mechanism with the four-way external path of the cylinder orifice, a dual path is realized in which the inner and outer annuli of the oil pipe are isolated and sealed from each other. The device of the present invention is convenient for loading and unloading of the oil pipe and resealing after loading and unloading, and the device can also well adapt to the special working environment underground.

[0019] Other advantages of the present invention will be supplemented below in conjunction with specific implementations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the device recorded in the embodiment of the present invention.

[0021] Figure 2 It is a schematic cross-sectional connection diagram of the front adjustable hinge pair, the base platform and the base recorded in the embodiment of the present invention.

[0022] Figure 3 It is a schematic cross-sectional connection diagram of the rear adjustable hinge pair, the base platform and the base recorded in the embodiment of the present invention.

[0023] The meaning of the symbols in the figure:

[0024] 1- cylinder, 2- double-channel sealing mechanism, 3- horizontal rotation mechanism, 4- base platform, 5- base platform height adjustment structure, 6- four-way, 7- oil pipe;

[0025] 201-seal seat, 202-seal nipple, 203-pressure cover, 204-through hole, 205-liquid passage, 206-hollow port;

[0026] 301-horizontal rotation bearing, 302-horizontal rotation support, 303-horizontal rotation limit track, 304-limit stopper;

[0027] 401-base platform base, 402-base platform moving platform, 403-limiting track, 404-limiting slide, 405-pitch adjustment gear, 406-pitch adjustment rack, 407-axle frame;

[0028] 501-base, 502-adjustable hinge pair, 503-hinge arm, 504-bidirectional tension chain rod, 505-T-frame, 506-connecting shaft, 507-tension chain rod box, 508-adjusting torsion plate, 509-auxiliary adjustment crank handle;

[0029] 601-high pressure and extraction passage, 602-high pressure and slag discharge passage. DETAILED DESCRIPTION

[0030] The "annulus outside the oil pipe" mentioned in the present invention refers to the annular space formed between the oil pipe and the pipeline (such as the cylinder 1, the sealing seat 201, the casing, etc.) sleeved outside the oil pipe.

[0031] The preferred embodiments of the present invention are described in detail below. However, the present invention is not limited to the following specific embodiments. Those skilled in the art may make modifications or equivalent changes within the scope of the claims, which should all be included in the protection scope of the present invention.

[0032] In the description of the invention, unless otherwise clearly specified and limited, the terms such as "set" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a direct connection or an indirect connection, etc. For ordinary technicians in this field, the specific meanings of the above terms in this technical solution can be understood according to the specific circumstances. In the absence of any contrary instructions, the directional words used, such as "upper, lower, bottom, top", are usually defined based on the drawings of the corresponding drawings, and "inside and outside" are defined based on the outline of the corresponding drawings.

[0033] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "include" and "have" and any variation thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] The specific embodiment of the present invention discloses a hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device, such as Figure 1 As shown, the device includes a cylinder 1, a double-channel sealing mechanism 2, a horizontal rotation mechanism 3, a base platform 4 and a base platform height adjustment structure 5.

[0035] One end of the cylinder 1 is sealed by a double-pass sealing mechanism, and the other end is open. The open end is used to connect the orifice casing. When the oil pipe 7 is inserted into the cylinder 1, the double-pass sealing mechanism 2 isolates and seals the annular passages inside and outside the oil pipe from each other, so that an isolated double passage is formed inside and outside the oil pipe.

[0036] like Figure 1As shown, the dual-channel sealing mechanism 2 of this embodiment includes a sealing seat 201, a sealing nipple 202 and a gland 203. The sealing seat 201 is provided with a through hole 204, and the diameter of the through hole 204 is larger than the diameter of the oil pipe 7 inserted into the sealing seat, so that an annular passage can be formed between the sealing seat 201 and the oil pipe. One end of the sealing seat 201 is connected to the cylinder 1, specifically through a flange sealing connection; the through hole 204 is connected to the inner cavity of the cylinder 1, and the other end of the sealing seat 201 is connected to the gland 203, specifically through a threaded connection.

[0037] The sealing nipple 202 is sandwiched between the gland 203 and the opening of the sealing seat 201. The sealing nipple 202 can block the through hole 204. Specifically, the sealing nipple 202 has a wedge-shaped cross section, and the through hole 204 is provided with a wedge-shaped surface with one end matching the sealing nipple 202. The sealing nipple 202 is connected to the oil pipe in front and back to form an inner passage. The sealing nipple 202 is pressed on the wedge-shaped section of the through hole 204 to form a seal of the outer passage. The gland 203 is connected to the sealing seat 201 to squeeze the sealing nipple 202 and the wedge-shaped section of the through hole 204 to seal. The sealing nipple 202 is provided with a liquid passage 205, which is connected to the through hole 204. Joints are provided at both ends of the sealing nipple 202 for connecting the oil pipe.

[0038] The gland 203 is provided with a hollow opening 206 , and the external oil pipe is connected to the sealing nipple 202 through the hollow opening 206 .

[0039] The sealing nipple 202 of the present embodiment is an integrally formed design that is internally connected. The sealing nipple 202 cooperates with the wedge-shaped surface of the sealing seat 201 to form a high-pressure sealing surface. The pressure cover 203 is used to achieve quick tightening to create a close contact between the sealing nipple 202 and the sealing surface of the sealing seat 201, thereby forming a high-pressure resistant seal, ensuring the dual-path isolation and independent sealing of the inner passage and the outer casing of the oil pipe.

[0040] The base platform 4 includes a base platform pedestal 401 and a base platform movable platform 402. The base platform movable platform 402 is connected to the base platform pedestal 401 through a slide rail, and the base platform movable platform 402 can move forward and backward on the base platform pedestal 401. Specifically: a limited position rail 403 is arranged on the base platform pedestal 401, and a limited position slide 404 is arranged at the bottom of the base platform movable platform 402. The limited position slide 404 is embedded in the limited position rail 403, and the limited position rail 403 is arranged as a dovetail groove structure, so as to realize the sliding connection between the base platform pedestal 401 and the base platform movable platform 402.

[0041] In order to realize the movement of the base platform movable platform 402, a pitch adjusting gear 405 is set on the base platform base 401, and a pitch adjusting rack 406 is set on the base platform movable platform 402. The pitch adjusting rack 406 cooperates with the pitch adjusting gear 405, and the base platform movable platform 402 is made to make a limited forward and backward movement relative to the base platform base 401 through the pitch adjusting gear 405.

[0042] The cylinder 1 is connected to the horizontal rotating mechanism 3, and the cylinder 1 is driven by the horizontal rotating mechanism 3 to perform planar rotation.

[0043] The horizontal rotation mechanism 3 of this embodiment includes a horizontal rotation bearing 301, a horizontal rotation support 302 and a horizontal rotation limiting track 303. The fixed end of the horizontal rotation bearing 301 is connected to the base platform movable table 402, and the rotating end of the horizontal rotation bearing 301 is connected to the cylinder 1; the horizontal rotation support 302 is arranged on the cylinder 1, and the horizontal rotation limiting track 303 is arranged on the base platform movable table 402. The horizontal rotation support 302 cooperates with the horizontal rotation limiting track 303. As the cylinder 1 rotates, the horizontal rotation support 302 can move on the horizontal rotation limiting track 303. The horizontal rotation support 302 of this embodiment is a hemispherical protrusion arranged on the surface of the cylinder 1, generally symmetrically arranged on both sides of the horizontal rotation bearing 301, and the horizontal rotation limiting track 303 is formed by two inner and outer annular protrusions coaxially arranged on the base platform movable table. The cylinder 1 is supported by the horizontal rotation support 302 to improve the stability of the rotation of the cylinder 1.

[0044] Further, in order to prevent the cylinder 1 from continuing to rotate after the position is adjusted, a limit stopper 304 is also provided to limit the rotation of the cylinder 1. After the position of the cylinder 1 is adjusted, the limit stopper 304 is placed on the horizontal rotation limit track 303 to prevent the cylinder 1 from continuing to rotate.

[0045] like Figure 2 and Figure 3 As shown, the base platform height adjustment mechanism 5 includes a base 501 and a plurality of adjustable hinges 502 arranged on the base 501. In this embodiment, there are two adjustable hinges. Each adjustable hinge 502 includes four hinge arms 503 and a bidirectional tensioning chain rod 504, wherein every two hinge arms 503 are hinged to form a group of connecting rods, and the two ends of the bidirectional tensioning chain rod 504 are respectively connected to the hinges of the two hinge arms 503 in the two groups of connecting rods. The bidirectional tensioning chain rod 504 is tightened or stretched to bring the hinges of the hinge arms 503 of the two groups of connecting rods closer or farther, thereby increasing or compressing the distance between the upper and lower ends of the hinge arms 503, thereby realizing the lifting and lowering of the base platform 4.

[0046] The two adjustable hinges 502 in this embodiment are respectively arranged on the two sides of the base platform 401. In this embodiment, the two adjustable hinges are respectively referred to as the front adjustable hinge and the rear adjustable hinge.

[0047] The connection between the base 501 and the hinge arm 503 of the front adjustable hinge and the rear adjustable hinge is hinged, and the connection between the base platform base 401 and the hinge arm 503 in the front adjustable hinge is hinged; the base platform base 401 and the hinge arm 503 in the rear adjustable hinge are connected by a T-frame 505.

[0048] Specifically, the flange of the T-frame 505 is hinged to the hinge arm 503 of the rear adjustable hinge pair, and the web of the T-frame 505 is hinged to the base platform 401. In order to match the T-frame 505, an axle frame 407 is provided at the bottom of the base platform 401. The axle frame 407 of this embodiment is three raised blocks, and gaps are provided between the raised blocks. The T-frame 505 is provided with a flange plate and two parallel webs. The two webs of the T-frame 505 are inserted into the two gaps of the axle frame 407 and connected through the connecting shaft 506. The base platform 401 can rotate around the connection between it and the T-frame 505, and the front and rear tilting of the seat platform is realized by differential lifting of the adjustable hinge pair 502.

[0049] In order to facilitate the telescopic adjustment of the bidirectional tension chain rod 504, a tension chain rod box 507 is provided on the bidirectional tension chain rod 504, and an adjustment knob 508 is provided on the tension chain rod box 507. The adjustment knob 508 is rotated to achieve the tension or extension of the bidirectional tension chain rod 504. In addition, an auxiliary adjustment crank 509 can be provided, and the adjustment knob 508 is rotated by the auxiliary adjustment crank 509 for convenient operation.

[0050] In this embodiment, the lifting and lowering of the base platform can be realized when the front and rear adjustable hinges are lifted synchronously, and the front and rear adjustable hinges are lifted differentially to realize the front and rear tilting of the seat platform.

[0051] In addition, as another optional scheme of the present embodiment, in order to realize the high-pressure sealed connection between the cylinder 1 and the orifice casing, the open end of the cylinder 1 is connected to the orifice casing through a four-way 6. Specifically, two ends of the four-way are sealedly connected to the cylinder 1 and the orifice casing through flanges, respectively, and the other two ends of the four-way are set as a high-pressure and extraction passage 601 and a high-pressure and slag discharge passage 602.

[0052] The present invention is mainly aimed at a three-degree-of-freedom adjustable mechanism for a dual-channel high-pressure sealing orifice device. The device of the present invention is convenient for loading and unloading of oil pipes and resealing after loading and unloading, and the device can also well adapt to the special working environment underground.

[0053] In addition, it should be noted that the three-degree-of-freedom adjustment mechanism (horizontal rotation mechanism 3, base platform 4 and base platform height adjustment structure 5) in the device of the present invention can also be used to adjust other forms of orifice pipes.

Claims

1. A three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device for hydraulic fracturing horizontal casing holes, characterized in that: It comprises a cylinder (1), a dual-channel sealing mechanism (2), a horizontal rotation mechanism (3), a base platform (4) and a base platform height adjustment mechanism (5); One end of the cylinder (1) is sealed by a double-channel sealing mechanism, and the other end is open. When the oil pipe (7) is inserted into the cylinder (1), the double-channel sealing mechanism (2) isolates and seals the annular passages inside and outside the oil pipe from each other. The base platform (4) comprises a base platform pedestal (401) and a base platform movable platform (402), wherein the base platform movable platform (402) is connected to the base platform pedestal (401) via a slide rail, and the base platform movable platform (402) can move forward and backward on the base platform pedestal (401); The cylinder (1) is connected to the horizontal rotation mechanism (3), and the cylinder (1) is driven by the horizontal rotation mechanism (3) to perform planar rotation; the horizontal rotation mechanism (3) is connected to the base platform movable table (402); The base platform height adjustment mechanism (5) comprises a base (501) and a plurality of adjustable hinge pairs (502) arranged on the base (501); each adjustable hinge pair (502) comprises four hinge arms (503) and a bidirectional tensioning chain rod (504), wherein every two hinge arms (503) are hinged to form a group of connecting rods, and the two ends of the bidirectional tensioning chain rod (504) are respectively connected to the hinges of two hinge arms (503) in the two groups of connecting rods, and the bidirectional tensioning chain rod (504) is tightened or stretched to bring the hinges of the hinge arms (503) of the two groups of connecting rods closer or farther away; The multiple adjustable hinge pairs (502) are distributed on both sides of the base platform pedestal (401); the connection between the base (501) and the hinge arm (503) is hinged; one side of the base platform pedestal (401) is hingedly connected to the hinge arm (503); the other side of the base platform pedestal (401) is connected to the hinge arm (503) via a T-shaped frame (505); the flange portion of the T-shaped frame (505) is hingedly connected to the hinge arm (503); and the web portion of the T-shaped frame (505) is hingedly connected to the base platform pedestal (401); The dual-path sealing mechanism (2) comprises a sealing seat (201), a sealing nipple (202) and a gland (203); the sealing seat (201) is provided with a through hole (204); one end of the sealing seat (201) is connected to the cylinder (1); the through hole (204) is communicated with the inner cavity of the cylinder (1); the other end of the sealing seat (201) is connected to the gland (203); the sealing nipple (202) is sandwiched between the gland (203) and the opening of the sealing seat (201); the sealing nipple (202) is capable of blocking the through hole (204); the sealing nipple (202) is provided with a liquid passage (205) communicated with the through hole (204); the gland (203) is provided with a hollow opening (206) for an external oil pipe to pass through; The open end of the cylinder (1) is connected to the orifice casing via a four-way (6), and the other two ends of the four-way are provided as a high-pressure and extraction passage (601) and a high-pressure and slag discharge passage (602).

2. The hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device according to claim 1, characterized in that: The horizontal rotation mechanism (3) comprises a horizontal rotation bearing (301), a horizontal rotation support (302) and a horizontal rotation limiting track (303); the fixed end of the horizontal rotation bearing (301) is connected to the base platform movable table (402), and the rotating end of the horizontal rotation bearing (301) is connected to the cylinder (1); the horizontal rotation support (302) is arranged on the cylinder (1), and the horizontal rotation limiting track (303) is arranged on the base platform movable table (402).

3. The hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device according to claim 2, characterized in that: The horizontal rotation mechanism (3) further comprises a limit stopper (304) for limiting the rotation of the cylinder (1).

4. The hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device according to claim 1, characterized in that: The base platform pedestal (401) is provided with a pitch-adjusting gear (405), and the base platform movable platform (402) is provided with a pitch-adjusting rack (406) that cooperates with the pitch-adjusting gear (405).

5. The hydraulic fracturing horizontal casing hole three-degree-of-freedom adjustable dual-path high-pressure sealing orifice device according to claim 1, characterized in that: The bidirectional tensioning chain rod (504) is provided with a tensioning chain rod box (507), and the tensioning chain rod box (507) is provided with an adjusting knob (508), and the bidirectional tensioning chain rod (504) is tightened or stretched by rotating the adjusting knob (508).

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