Gas expansion rock fracturing device

Abstract

The utility model discloses a gas expansion rock fracturing device which comprises at least two sections of fracturing pipes, and the sections of fracturing pipes are connected through connecting pieces. The connecting piece comprises an upper joint and a lower joint; the upper connector is fixed to the upper end of the lower fracturing pipe, a first external thread part is arranged on the upper portion of the upper connector, a first through hole penetrating up and down is formed in the upper connector, the lower end of the upper connector is connected with a heating device, and a first aviation plug is arranged at the upper end of the heating device. The lower connector is fixed to the lower end of the upper fracturing pipe, a connecting sleeve is rotationally installed at the lower end of the lower connector, internal threads are arranged in the connecting sleeve, a second through hole is formed in the lower connector, a fracturing piece is arranged at the upper end of the lower connector, a second aviation plug is arranged at the lower end of the lower connector, and the heating device is electrically connected with the second aviation plug through a wire penetrating through the fracturing piece. And an energy release hole communicated with the second through hole is formed in the side part of the lower joint. According to the utility model, the problems of inconvenient wiring and troublesome butt joint of the fracturing pipes during butt joint of the fracturing pipes are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas fracturing, in particular to a gas expansion rock fracturing device. Background Art

[0002] Gas fracturing is a technology that uses the expansion or compression of gas to generate destructive force. It is often used in fields such as rock mining. Gas fracturing usually involves heating or pressurizing a gas (such as carbon dioxide) to rapidly expand its volume, thereby generating powerful force.

[0003] For example, Chinese invention patent CN107237633A discloses a carbon dioxide fracturing device and a method for breaking rocks using the carbon dioxide fracturing device, including a filling valve, a main pipe, a first exhaust device and a second exhaust device. The main pipe is connected to the filling valve, the main pipe includes a cavity for containing liquid carbon dioxide, the first exhaust device is arranged at the upper part of the main pipe and communicated with the cavity, the second exhaust device is arranged at the lower part of the main pipe and communicated with the cavity, the energy release valve is connected to the main pipe and connected to the cavity through a constant pressure shear plate, a heating device is arranged in the cavity, the heating device heats the liquid carbon dioxide in the cavity, gasifies and expands the liquid carbon dioxide, and the mechanical energy generated when the liquid carbon dioxide gasifies and expands to a certain pressure causes the constant pressure shear plate to break.

[0004] When using the above-mentioned fracturing device to break rocks, it is often necessary to connect multiple fracturing pipes for use. When connecting, it is necessary to connect the various heating devices in series through wires. The existing technology has the problems of inconvenient wiring and troublesome fracturing pipe docking. Utility Model Content

[0005] In view of the defects in the prior art, the utility model provides a gas expansion rock fracturing device to solve the problems of inconvenient wiring and troublesome fracturing pipe docking when fracturing pipes are docked.

[0006] The utility model provides a gas expansion rock fracturing device, comprising at least two sections of fracturing pipes, each section of the fracturing pipes being connected via a connecting piece;

[0007] The connecting piece includes an upper joint and a lower joint;

[0008] The upper joint is fixed to the upper end of the lower side fracturing tube, the upper part of the upper joint is provided with a first external threaded part, the upper part of the upper joint is provided with a first through hole running through the upper and lower parts, the lower end of the upper joint is connected to a heating device which is blocked at the lower end of the first through hole and extends into the fracturing tube, and the upper end of the heating device is provided with a first aviation plug which extends into the first through hole;

[0009] The lower joint is fixed to the lower end of the upper side fracturing tube, and a connecting sleeve is rotatably installed at the lower end of the lower joint. The connecting sleeve is provided with an internal thread adapted to the first external threaded portion, and a second through hole is provided in the lower joint. A rupture piece for sealing the upper end of the second through hole is provided at the upper end of the lower joint, and a second aviation plug that is sealed at the lower end of the second through hole and adapted to the first aviation plug is provided at the lower end of the lower joint. The heating device is electrically connected to the second aviation plug through a wire passing through the rupture piece, and an energy discharge hole connected to the second through hole is provided on the side of the lower joint.

[0010] Furthermore, a second external threaded portion is provided at the lower portion of the upper joint, a first inner convex ring is provided on the inner wall of the fracturing tube near its upper end, an outer convex ring is provided outside the heating device, and the upper joint is threadedly connected to the upper end of the fracturing tube and the outer convex ring is pressed against the first inner convex ring.

[0011] Furthermore, a first twisting portion is provided outside the upper joint between the first external threaded portion and the second external threaded portion.

[0012] Furthermore, a third external threaded portion is provided at the upper portion of the lower joint, a second inner convex ring is provided on the inner wall of the fracturing tube near its lower end, and the third external threaded portion of the lower joint is connected to the lower end of the fracturing tube and presses the rupture disc under the second inner convex ring.

[0013] Furthermore, a second twisting portion is provided outside the lower joint between the connecting sleeve and the third external threaded portion.

[0014] Furthermore, a fourth external threaded portion is provided on the upper portion of the second aviation plug, and the fourth external threaded portion of the second aviation plug is threadedly connected to the lower end of the fracturing tube.

[0015] Furthermore, the first aviation plug is a male plug, the upper end of which does not exceed the upper end of the upper joint, and the second aviation plug is a female plug, the lower end of which does not exceed the lower end of the connecting sleeve, and the female plug can be plugged and matched with the upper end of the second through hole.

[0016] Furthermore, it also includes an external aviation plug, and the upper end of the top fracture tube is provided with an upper joint, and the external aviation plug is used for the first aviation plug-in cooperation of the upper joint.

[0017] Furthermore, a guide head is provided at the lower end of the bottom fracturing tube, the structure of the upper part of the guide head is the same as that of the lower joint, and the lower end of the guide head is a closed cone.

[0018] The beneficial effects of the utility model are embodied in:

[0019] When docking the fracturing pipes, align the lower joint at the lower end of the upper fracturing pipe with the upper joint at the upper end of the lower fracturing pipe, and then tighten the connecting sleeve on the lower joint with the first external threaded portion on the upper part of the upper joint to achieve docking between the two fracturing pipes. When the two fracturing pipes are docked, the second aviation plug at the lower end of the lower joint and the first aviation plug at the upper end of the upper joint are automatically docked, thereby connecting the heating devices in each fracturing pipe in series. During blasting, the docked fracturing pipes are sent into the blasthole, and each heating device is powered on at the same time. The heating device heats the liquid carbon dioxide in the fracturing pipe, and the volume of the carbon dioxide expands rapidly, breaking through the rupture disc and ejecting from the energy release hole, thereby achieving gas expansion rock fracturing. Compared with the prior art, the present application solves the problems of inconvenient wiring and troublesome docking of fracturing pipes when docking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 This is a schematic diagram of the fracturing pipe docking of an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A magnified view of part A;

[0023] Figure 3 It is a schematic diagram of the structure of a single fracturing tube according to an embodiment of the utility model.

[0024] In the attached drawings, 100-fracture tube; 110-first inner convex ring; 120-second inner convex ring; 200-upper joint; 210-first external threaded portion; 220-first through hole; 230-heating device; 231-first aviation plug; 232-conducting wire; 233-external convex ring; 240-second external threaded portion; 250-first twisting portion; 300-lower joint; 310-connecting sleeve; 320-second through hole; 330-rupture disc; 340-second aviation plug; 341-fourth external threaded portion; 350-energy release hole; 360-third external threaded portion; 370-second twisting portion; 400-external aviation plug; 500-guide head. DETAILED DESCRIPTION

[0025] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0027] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides a gas expansion rock fracturing device, comprising at least two sections of fracturing tubes 100, and each section of the fracturing tubes 100 is connected by a connecting piece.

[0028] The connecting piece includes an upper joint 200 and a lower joint 300 .

[0029] The upper joint 200 is fixed to the upper end of the lower side fracturing tube 100, and a first external threaded portion 210 is provided at the upper portion of the upper joint 200. A first through hole 220 penetrating from top to bottom is provided in the upper joint 200. A heating device 230 is connected to the lower end of the upper joint 200, which is sealed at the lower end of the first through hole 220 and extends into the fracturing tube 100, and a first aviation plug 231 extending into the first through hole 220 is provided at the upper end of the heating device 230.

[0030] The lower joint 300 is fixed to the lower end of the upper side fracturing tube 100, and a connecting sleeve 310 is rotatably installed on the lower end of the lower joint 300. The connecting sleeve 310 is provided with an internal thread adapted to the first external threaded portion 210, and a second through hole 320 is provided in the lower joint 300. A rupture piece 330 for sealing the upper end of the second through hole 320 is provided at the upper end of the lower joint 300, and a second aviation plug 340 is provided at the lower end of the lower joint 300, which is sealed at the lower end of the second through hole 320 and adapted to the first aviation plug 231. The heating device 230 is electrically connected to the second aviation plug 340 via a wire 232 passing through the rupture piece 330, and an energy discharge hole 350 connected to the second through hole 320 is provided on the side of the lower joint 300.

[0031] When docking the fracturing pipes 100, align the lower joint 300 at the lower end of the upper fracturing pipe 100 with the upper joint 200 at the upper end of the lower fracturing pipe 100, and then tighten the connecting sleeve 310 on the lower joint 300 with the first external threaded portion 210 on the upper part of the upper joint 200, so as to achieve docking between the two fracturing pipes 100. When the two fracturing pipes 100 are docked, the second aviation plug 340 at the lower end of the lower joint 300 and the first aviation plug 231 at the upper end of the upper joint 200 are automatically docked, so that each fracturing pipe 10 0 are connected in series. During blasting, the connected fracturing tubes 100 are sent into the blasthole and each heating device 230 is powered on. The heating device 230 heats the liquid carbon dioxide in the fracturing tube 100. The volume of the carbon dioxide expands rapidly, breaks through the rupture piece 330 and is ejected from the energy release hole 350, thereby achieving gas expansion rock fracturing. Compared with the prior art, the present application solves the problems of inconvenient wiring and troublesome docking of the fracturing tubes 100 when docking.

[0032] The fracturing tube 100 of this embodiment can be reused, and the heating device 230 and the fracturing piece are disposable items. After use, the heating device 230 and the fracturing piece are replaced, and the carbon dioxide in the fracturing tube 100 is refilled, and then it can be used again.

[0033] In this embodiment, refer to Figure 2 , a second external threaded portion 240 is provided at the lower part of the upper joint 200, a first inner convex ring 110 is provided near the upper end of the inner wall of the fracturing tube 100, and an outer convex ring 233 is provided on the outside of the heating device 230. The upper joint 200 is threadedly connected to the upper end of the fracturing tube 100 and the outer convex ring 233 is pressed against the first inner convex ring 110. When assembling the heating device 230, the heating device 230 is inserted into the upper end of the fracturing tube 100, and then the upper joint 200 is tightened to press the outer convex ring 233 on the heating device 230 against the upper side of the first inner convex ring 110, and the assembly of the heating device 230 is very convenient. In order to facilitate the screwing of the upper joint 200 during assembly, a first screwing portion 250 is provided on the outside of the upper joint 200 between the first external threaded portion 210 and the second external threaded portion 240.

[0034] In this embodiment, refer to Figure 2 The upper part of the lower joint 300 is provided with a third external threaded portion 360, and the inner wall of the fracturing tube 100 is provided with a second inner convex ring 120 near its lower end. The third external threaded portion 360 of the lower joint 300 is connected to the lower end of the fracturing tube 100 and presses the rupture disc 330 under the second inner convex ring 120. When assembling the rupture disc 330, first install the rupture disc 330 into the lower end of the fracturing tube 100, and then tighten the lower joint 300 to press the rupture disc 330 under the second inner convex ring 120. The assembly of the rupture disc 330 is very convenient. In order to facilitate the screwing of the lower joint 300 during assembly, the lower joint 300 is provided with a second screwing portion 370 between the connecting sleeve 310 and the third external threaded portion 360.

[0035] In order to facilitate replacement of the second aviation plug 340 , a fourth external threaded portion 341 is provided on the upper portion of the second aviation plug 340 , and the fourth external threaded portion 341 of the second aviation plug 340 is threadedly connected to the lower end of the fracturing tube 100 .

[0036] In this embodiment, the first aviation plug 231 is preferably a male plug, the upper end of the male plug does not exceed the upper end of the upper joint 200 to avoid the male plug being damaged during transportation, and the second aviation plug 340 is preferably a female plug, the lower end of the female plug does not exceed the lower end of the connecting sleeve 310 to avoid the female plug being damaged during transportation, and the female plug can be plugged in and matched with the upper end of the second through hole 320.

[0037] This embodiment also includes an external aviation plug 400, referring to Figure 1The upper end of the top fracturing tube 100 is provided with an upper joint 200, and the external aviation plug 400 is used for plugging and matching with the first aviation plug 231 of the upper joint 200, and the external aviation plug 400 is used for an external detonation controller.

[0038] In this embodiment, refer to Figure 1 A guide head 500 is provided at the lower end of the bottom fracturing tube 100. The structure of the upper part of the guide head 500 is the same as that of the lower joint 300. The lower end of the guide head 500 is a closed cone. The guide head 500 is mainly used to guide when the fracturing tube 100 is installed into the blasting hole.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A gas expansion rock fracturing device, comprising at least two fracturing tubes, each of which is connected by a connector, characterized in that: The connecting piece includes an upper joint and a lower joint; The upper joint is fixed to the upper end of the lower side fracturing tube, the upper part of the upper joint is provided with a first external threaded part, the upper part of the upper joint is provided with a first through hole running through the upper and lower parts, the lower end of the upper joint is connected to a heating device which is blocked at the lower end of the first through hole and extends into the fracturing tube, and the upper end of the heating device is provided with a first aviation plug which extends into the first through hole; The lower joint is fixed to the lower end of the upper side fracturing tube, and a connecting sleeve is rotatably installed at the lower end of the lower joint. The connecting sleeve is provided with an internal thread adapted to the first external threaded portion, and a second through hole is provided in the lower joint. A rupture piece for sealing the upper end of the second through hole is provided at the upper end of the lower joint, and a second aviation plug that is sealed at the lower end of the second through hole and adapted to the first aviation plug is provided at the lower end of the lower joint. The heating device is electrically connected to the second aviation plug through a wire passing through the rupture piece, and an energy discharge hole connected to the second through hole is provided on the side of the lower joint.

2. The gas expansion rock fracturing device according to claim 1, characterized in that: The lower part of the upper joint is provided with a second external threaded part, the inner wall of the fracturing tube is provided with a first inner convex ring near its upper end, the outer part of the heating device is provided with an outer convex ring, and the upper joint is threadedly connected to the upper end of the fracturing tube and the outer convex ring is pressed against the first inner convex ring.

3. The gas expansion rock fracturing device according to claim 2, characterized in that: A first twisting portion is disposed outside the upper joint and between the first external thread portion and the second external thread portion.

4. The gas expansion rock fracturing device according to claim 1, characterized in that: The upper part of the lower joint is provided with a third external threaded portion, the inner wall of the fracturing tube is provided with a second inner convex ring near its lower end, the third external threaded portion of the lower joint is connected to the lower end of the fracturing tube and presses the rupture disc under the second inner convex ring.

5. The gas expansion rock fracturing device according to claim 4, characterized in that: A second twisting portion is provided outside the lower joint and between the connecting sleeve and the third external threaded portion.

6. The gas expansion rock fracturing device according to claim 1, characterized in that: A fourth external threaded portion is provided on the upper portion of the second aviation plug, and the fourth external threaded portion of the second aviation plug is threadedly connected to the lower end of the fracturing tube.

7. The gas expansion rock fracturing device according to claim 1, characterized in that: The first aviation plug is a male plug, the upper end of which does not exceed the upper end of the upper joint, and the second aviation plug is a female plug, the lower end of which does not exceed the lower end of the connecting sleeve, and the female plug can be plugged and matched with the upper end of the second through hole.

8. The gas expansion rock fracturing device according to claim 1, characterized in that: It also includes an external aviation plug. The upper end of the top fracture tube is provided with an upper joint. The external aviation plug is used for the first aviation plug of the upper joint.

9. The gas expansion rock fracturing device according to claim 1, characterized in that: A guide head is arranged at the lower end of the bottom fracturing pipe, the structure of the upper part of the guide head is the same as that of the lower joint, and the lower end of the guide head is a closed cone.

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