Anti-corrosion fastener for underground deep shaft

Abstract

The utility model discloses an underground deep shaft anti-corrosion fastener, which belongs to the technical field of deep stratum shaft corrosion prevention and comprises an upper shaft, a shaft fastener ring is fixedly arranged at the bottom of the upper shaft, a lower shaft is in threaded connection with the bottom of the shaft fastener ring, and four upper drainage pipes are arranged on the periphery of the outer side of the upper shaft in a surrounding manner. The tops of the four upper drainage pipes are connected with ground hydraulic equipment, anti-corrosion semi-fluid materials circulate in the upper drainage pipes, the interiors of the four upper drainage pipes communicate with the interior of the shaft fastener ring, and the interiors of the four upper drainage pipes communicate with the lower drainage pipes correspondingly arranged at the bottoms of the upper drainage pipes correspondingly. Corrosion-resistant semi-fluid materials are injected into the first threads and the second threads at the position of the shaft connector through the upper drainage pipes on the four sides of the upper shaft, micro gaps at the position of the shaft connector are blocked by expelling or isolating underground deep stratum corrosive inorganic chemical substances or fluid and the like, and finally the effects of isolating air or fluid and protecting the shaft are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wellbore anti-corrosion, and more specifically, to an anti-corrosion fastener for an underground deep wellbore. Background Art

[0002] Deep underground wellbores are wellbores and their ancillary facilities that are buried up to 1000m below the ground and are used to transport or output liquids, gases or loose solids. They are an important part of the infrastructure of deep underground injection and production projects. Deep underground wellbore corrosion protection refers to the process of taking a series of technologies and measures to prevent or slow down the corrosion of various wellbores buried up to 1000m below the surface.

[0003] Successful development of wellbore anti-corrosion materials is now commonplace. However, when deep underground wellbores are exposed to highly corrosive environments, corrosion often occurs not in the wellbore itself but at its joints. While there are many different types of wellbore joints, bolted fasteners are the most common due to their short construction times, ease of operation, and low cost. Therefore, the development and innovation of anti-corrosion fasteners for deep underground wellbores is urgent. Utility Model Content

[0004] The main technical problem solved by the present invention is to provide an anti-corrosion fastener for deep underground wells, which can solve the problems raised by the above-mentioned background technology.

[0005] In order to solve the above technical problems, according to one aspect of the utility model, more specifically, an anti-corrosion fastener for an underground deep wellbore, comprising an upper wellbore, a wellbore fastener ring is fixedly arranged at the bottom of the upper wellbore, the bottom of the wellbore fastener ring is threadedly connected to the lower wellbore, four upper drainage pipes are arranged around the outer circumference of the upper wellbore, the tops of the four upper drainage pipes are all connected to ground hydraulic equipment and anti-corrosion semi-fluid material flows inside, four lower drainage pipes are arranged around the outer circumference of the lower wellbore, the interiors of the four upper drainage pipes are all connected to the interior of the wellbore fastener ring and are respectively connected to the lower drainage pipes arranged correspondingly at the bottom.

[0006] Furthermore, a first thread is fixedly provided on the inner side of the wellbore fastener ring, a connecting bolt is fixedly provided on the top of the lower wellbore, a second thread is fixedly provided on the outer side of the connecting bolt, and the first thread is tightly connected to the second thread.

[0007] Furthermore, a hydraulic hole is opened inside the upper drainage pipe, and four liquid inlet holes are spirally arranged inside the wellbore fastener ring. The positions of the four liquid inlet holes respectively correspond to the four hydraulic holes and are respectively connected to the four hydraulic holes.

[0008] Furthermore, four liquid flow grooves are spirally arranged on the outer side of the connecting bolt, and the four liquid flow grooves respectively correspond to the four liquid inlet holes and are interconnected and are inserted into the first thread and the second thread protrusion.

[0009] The beneficial effects of the anti-corrosion fastener for deep underground wells of the utility model are:

[0010] By utilizing the high-pressure injection effect of ground hydraulic equipment, anti-corrosion semi-fluid material is injected into the first and second threads at the wellbore interface through the upper drainage pipes on the four sides of the upper wellbore. By driving away or isolating underground corrosive inorganic chemicals or fluids, the micro-gaps at the wellbore interface are sealed, ultimately achieving the effect of isolating air or fluid and protecting the wellbore. Compared with wellbores connected by welding or other methods, this method is more corrosion-resistant and more flexible in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of a deep underground wellbore anti-corrosion fastener of the utility model;

[0013] Figure 2 This is a schematic diagram of the outer structure of a shaft fastener ring of an anti-corrosion fastener for a deep underground shaft according to the present invention;

[0014] Figure 3 This is a schematic structural diagram of a cross-sectional view of a deep underground wellbore anti-corrosion fastener according to the present invention;

[0015] Figure 4 This is a schematic diagram of the internal structure of a shaft fastener ring of an anti-corrosion fastener for a deep underground shaft according to the present invention;

[0016] Figure 5 This is a schematic diagram of the connecting bolt structure of an anti-corrosion fastener for a deep underground wellbore according to the utility model.

[0017] In the figure: 1, upper wellbore; 2, wellbore fastener ring; 20, upper drainage pipe; 21, hydraulic hole; 22, first thread; 23, liquid inlet hole; 3, lower wellbore; 30, lower drainage pipe; 31, connecting bolt; 32, second thread; 33, liquid flow trough. DETAILED DESCRIPTION

[0018] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0019] like Figure 1-Figure 5As shown, according to one aspect of the present invention, an underground deep wellbore anti-corrosion fastener is provided, comprising an upper wellbore (1), a wellbore fastener ring (2) is fixedly provided at the bottom of the upper wellbore (1), the bottom of the wellbore fastener ring (2) is threadedly connected to a lower wellbore (3), four upper drainage pipes (20) are arranged around the outer circumference of the upper wellbore (1), the tops of the four upper drainage pipes (20) are all connected to ground hydraulic equipment and anti-corrosion semi-fluid material flows inside, four lower drainage pipes (30) are arranged around the outer circumference of the lower wellbore (3), and the four The interior of each upper drainage pipe (20) is connected to the interior of the wellbore fastener ring (2) and is respectively connected to the lower drainage pipe (30) correspondingly arranged at the bottom. By utilizing the high-pressure injection effect of the ground hydraulic equipment, the anti-corrosion semi-fluid material is injected into the first thread (22) and the second thread (32) at the wellbore interface through the upper drainage pipes (20) on the four sides of the upper wellbore (1). By driving away or isolating underground corrosive inorganic chemicals or fluids, the micro gaps at the wellbore interface are blocked, and the effect of isolating air or fluid and protecting the wellbore is finally achieved.

[0020] In this embodiment, a first thread (22) is fixedly provided on the inner side of the wellbore fastener ring (2), a connecting bolt (31) is fixedly provided on the top of the lower wellbore (3), and a second thread (32) is fixedly provided on the outer side of the connecting bolt (31), and the first thread (22) and the second thread (32) are tightly connected.

[0021] In this embodiment, a hydraulic hole (21) is provided inside the upper drainage pipe (20), and four liquid inlet holes (23) are spirally arranged inside the wellbore fastener ring (2). The positions of the four liquid inlet holes (23) respectively correspond to the four hydraulic holes (21) and are respectively connected to the four hydraulic holes (21).

[0022] In this embodiment, four liquid flow grooves (33) are spirally arranged around the outer side of the connecting bolt (31), and the four liquid flow grooves (33) respectively correspond to the four liquid inlet holes (23) and are interconnected and are inserted into the protrusions of the first thread (22) and the second thread (32).

[0023] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An anti-corrosion fastener for a deep underground wellbore, comprising an upper wellbore (1), characterized in that: A wellbore fastener ring (2) is fixedly provided at the bottom of the upper wellbore (1), and the bottom of the wellbore fastener ring (2) is threadedly connected to the lower wellbore (3). Four upper drainage pipes (20) are arranged around the outer circumference of the upper wellbore (1), and the tops of the four upper drainage pipes (20) are connected to the ground hydraulic equipment and anti-corrosion semi-fluid material flows inside. Four lower drainage pipes (30) are arranged around the outer circumference of the lower wellbore (3), and the insides of the four upper drainage pipes (20) are connected to the inside of the wellbore fastener ring (2) and are respectively connected to the lower drainage pipes (30) arranged correspondingly at the bottom.

2. The anti-corrosion fastener for deep underground wellbore according to claim 1, characterized in that: A first thread (22) is fixedly provided on the inner side of the wellbore fastener ring (2), a connecting bolt (31) is fixedly provided on the top of the lower wellbore (3), and a second thread (32) is fixedly provided on the outer side of the connecting bolt (31), and the first thread (22) and the second thread (32) are tightly connected.

3. The anti-corrosion fastener for deep underground wellbore according to claim 2, characterized in that: A hydraulic hole (21) is provided inside the upper drainage pipe (20), and four liquid inlet holes (23) are spirally arranged inside the wellbore fastener ring (2). The positions of the four liquid inlet holes (23) respectively correspond to the four hydraulic holes (21) and are respectively connected to the four hydraulic holes (21).

4. The anti-corrosion fastener for deep underground wellbore according to claim 3, characterized in that: Four liquid flow grooves (33) are spirally arranged around the outer side of the connecting bolt (31), and the four liquid flow grooves (33) respectively correspond to the four liquid inlet holes (23) and are interconnected and are inserted into the protruding parts of the first thread (22) and the second thread (32).

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