Expanding type wear-resistant packer for underground drilling water pressure test

Abstract

The utility model relates to the technical field of hydrogeological exploration, and discloses an expansion type wear-resistant packer for an underground drilling water pressing test. The fixing cylinder and the rubber cylinder are sequentially, coaxially and fixedly arranged on the peripheral side of the center rod in a sleeving mode from inside to outside, the peripheral sides of the two ends of the rubber cylinder are each sleeved with a pressing ring and abut against an end iron head, and the end iron heads are fixedly connected with the fixing cylinder and provided with filling holes. And a filling channel for communicating the filling hole with the inner bottom surface of the rubber cylinder is distributed in the fixed cylinder. Through the arrangement of the filling hole and the filling channel, the effect that water is in rapid contact with the inner wall of the rubber cylinder can be achieved, and therefore the problem that water is difficult to fill and pump out is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogeological exploration, in particular to an expansion type wear-resistant packer for underground drilling water pressure test. Background Art

[0002] The water pressure test is an in-situ test that uses high pressure to pressurize water into the borehole and calculate the development of rock mass cracks and water permeability based on the amount of water absorbed by the rock mass. It is a basic test method used to determine the permeability of fractured rock mass in my country's water conservancy and hydropower projects. Conventional water pressure tests usually use the expansion and contraction of packers to achieve isolation and sealing of the formation in order to accurately conduct permeability tests.

[0003] The patent with announcement number CN202628024U discloses an ultra-high pressure packer device, which has a hollow center rod, a rubber tube coaxially sleeved outside the center rod, and the two ends of the rubber tube connected to the center rod through a rubber tube connector. The two ends of the rubber tube are sleeved with iron rings, and the end iron heads are sealed and connected respectively. The end iron heads are provided with a packer water inlet hole connected to the rubber tube. The patent uses the gap between the rubber tube connector and the center rod to pass water to achieve the expansion and contraction process of the rubber tube. Since the rubber tube connector and the center rod are coaxially fixedly connected, the contact area is large, which is not conducive to the passage of water, and there are problems of difficulty in filling and extraction; in addition, the material of the existing rubber tube is mostly single-layer rubber material, which is frequently used in work and is prone to aging and failure, which restricts the service life of the packer.

[0004] In view of this, how to change the current situation that the rubber cylinder is difficult to fill and extract water during use and has a short service life has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The utility model aims to provide an expandable wear-resistant packer for underground drilling water pressure test to overcome the shortcomings of the above situation.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0007] An expandable wear-resistant packer for downhole drilling water pressure test, comprising:

[0008] center pole; and

[0009] A fixed cylinder and a rubber cylinder are coaxially fixedly sleeved on the circumference of the center rod from the inside to the outside, and clamping rings are respectively sleeved on the circumferences of both ends of the rubber cylinder, and are respectively abutted against end iron heads, and the end iron heads are fixedly connected to the fixed cylinder and are provided with a filling hole, and a filling channel is provided in the fixed cylinder for connecting the filling hole with the inner bottom surface of the rubber cylinder.

[0010] Furthermore, the outer wall of the fixing tube is provided with a plurality of annular positioning grooves, the annular positioning grooves are arranged opposite to the clamping ring, and the two ends of the rubber tube are clamped between the annular positioning grooves and the clamping ring.

[0011] Furthermore, guide rings arranged opposite to the annular positioning grooves are respectively sleeved on both ends of the rubber tube, the two guide rings are respectively arranged on the inner sides of the two clamping rings, and the guide rings are fixedly connected to the clamping rings.

[0012] Further, the filling hole comprises a first filling hole and a second filling hole respectively arranged along the axial direction and radial direction of the end iron head, the first filling hole and the second filling hole are connected, and the second filling hole is connected to the filling channel.

[0013] Furthermore, a first sealing ring is provided between the end iron head and the fixing tube, and the first sealing ring is located between the second filling hole and the rubber tube.

[0014] Furthermore, a second sealing ring is provided between the fixing tube and the center rod, and the second sealing ring is located on both sides of the filling channel along the length direction of the center rod.

[0015] Furthermore, the rubber tube comprises a first rubber layer, a reinforcing interlayer and a second rubber layer which are sequentially arranged from the inside to the outside, and the reinforcing interlayer is made of polyester dipped cord fabric.

[0016] Furthermore, the outer surface of the second rubber layer is a rough surface.

[0017] Compared with the prior art, the utility model has at least the following advantages:

[0018] (1) When isolating and sealing the underground borehole formation, a high-pressure water pump is used to connect the filling hole through a high-pressure pipe, and water is continuously added to the filling hole. After the water passes through the filling channel, it acts on the rubber tube, causing the rubber tube to expand continuously and come into close contact with the rock mass of the borehole wall. When the water pressure in the packer device reaches the predetermined packing pressure, then stop injecting water into the filling hole, and the water pressure test can be carried out. After the test, the water can be pumped out through the filling hole. The utility model can achieve the effect of quickly contacting the water with the inner wall of the rubber tube by setting the filling hole and the filling channel, thereby solving the problem of difficulty in filling and pumping out water.

[0019] (2) The combination of rubber and cord fabric can significantly increase the pressure-bearing capacity of rubber products. In addition, the cord fabric, as a skeleton material, can enable rubber products to withstand greater impact loads and strong vibrations, thereby improving the durability and safety of the product and further improving the wear resistance of the packer of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model of an expandable wear-resistant packer for downhole drilling water pressure test;

[0022] Figure 2 It is a cross-sectional view of the rubber tube of the utility model.

[0023] Figure numerals: 1, center rod; 2, fixing tube; 3, rubber tube; 4, clamping ring; 5, end iron head; 6, filling hole; 7, filling channel; 8, annular positioning groove; 9, guide ring; 10, first sealing ring; 11, second sealing ring; 301, first rubber layer; 302, reinforcing interlayer; 303, second rubber layer; 601, first filling hole; 602, second filling hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1The utility model provides an expandable wear-resistant packer for a downhole borehole water pressure test, which is used to isolate and seal the downhole borehole formation during the water pressure test. The specific structure includes a center rod 1, a fixed tube 2, a rubber tube 3, a clamping ring 4 and an end iron head 5. The center rod 1 is a hollow structure, which is used for water injection in the test section. The fixed tube 2 and the rubber tube 3 are coaxially sleeved on the circumference of the center rod 1. The center rod 1, the fixed tube 2 and the rubber tube 3 are arranged in sequence from the inside to the outside. The circumference of both ends of the rubber tube 3 is respectively sleeved with a clamping ring 4. The clamping ring 4 and the fixed tube 2 are used to fix the two sides of the rubber tube 3. The two ends of the rubber tube 3 are respectively abutted with an end iron head 5, and the end iron head 5 is fixedly connected to the fixed tube 2. The end iron head 5 is used to stop the two ends of the rubber tube 3, thereby realizing the limit of the two ends of the rubber tube 3. The end iron head 5 is provided with a filling hole 6, and the fixed tube 2 is provided with a filling channel 7 for realizing the connection between the filling hole 6 and the inner bottom surface of the rubber tube 3.

[0027] It should be noted that the utility model Figure 1 The packer in the figure is a packer style at the upper end of the center rod 1. The lower end iron head 5 of the packer at the lower end of the center rod 1 should not be provided with a filling hole 6, and the lower filling hole 6 of the packer at the upper end of the center rod 1 is connected with the filling hole 6 above the packer at the lower end of the center rod 1 by a connecting pipe. A high-pressure hose can be used for the connecting pipe, so that the two rubber tubes 3 at the upper and lower ends can expand and contract synchronously.

[0028] When isolating and sealing the underground borehole formation, a high-pressure water pump is used to connect the filling hole 6 through a high-pressure pipe, and water is continuously added to the filling hole 6. After the water passes through the filling channel 7, it acts on the rubber tube 3, so that the rubber tube 3 continues to expand and is in close contact with the rock mass of the borehole wall. When the water pressure in the packer device reaches the predetermined packing pressure, the water injection into the filling hole 6 can be stopped, and a water pressure test can be performed at this time. After the test is completed, the water can be pumped out through the filling hole 6. The utility model can achieve the effect of quickly contacting the water with the inner wall of the rubber tube 3 by setting the filling hole 6 and the filling channel 7, thereby solving the problem of difficulty in filling and pumping out water.

[0029] In order to improve the fixing effect of the two ends of the rubber tube 3, the outer wall of the fixing tube 2 of the utility model is provided with a plurality of annular positioning grooves 8, and the annular positioning grooves 8 are arranged opposite to the clamping ring 4. Annular protrusions are provided at both ends of the rubber tube 3, and the annular protrusions can be embedded in the annular positioning grooves 8. The two ends of the rubber tube 3 are clamped between the annular positioning grooves 8 and the clamping ring 4, thereby realizing the fixing process of the rubber tube 3.

[0030] Guide rings 9 are respectively sleeved on both ends of the rubber tube 3 and are arranged opposite to the annular positioning groove 8. The two guide rings 9 are respectively arranged on the inner sides of the two clamping rings 4. The sides of the two clamping rings 4 that are close to each other are arranged in a stepped shape. One end of the guide ring 9 is overlapped on the clamping ring 4, and the guide ring 9 is fixedly connected to the clamping ring 4. The guide ring 9 is fixed to both ends of the rubber tube 3 to realize the positioning of the rubber tube 3.

[0031] In a specific embodiment of the present invention, the filling hole 6 includes a first filling hole 601 and a second filling hole 602 respectively arranged along the axial and radial directions of the end iron head 5, the first filling hole 601 and the second filling hole 602 are connected, and the second filling hole 602 is connected to the filling channel 7. Preferably, a first sealing ring 10 is arranged between the end iron head 5 and the fixed tube 2, and a high-pressure sealing ring can be selected for the first sealing ring 10. The first sealing ring 10 is located between the second filling hole 6 and the rubber tube 3. By setting the first sealing ring 10, the sealing between the end iron head 5 and the fixed tube 2 can be ensured. Since the lower end of the packer at the lower end of the center rod 1 is not provided with a filling hole 6, similarly, the filling channel 7 may not be provided here.

[0032] Optionally, a second sealing ring 11 is provided between the fixed cylinder 2 and the center rod 1. The second sealing ring 11 is located on both sides of the filling channel 7 along the length direction of the center rod 1. A high-pressure sealing ring can be used for the second sealing ring 11. By providing the second sealing ring 11, the sealing between the fixed cylinder 2 and the center rod 1 can be enhanced.

[0033] Reference Figure 2 The traditional rubber tube is a single-layered one, which is prone to cracks and wear when interacting with the rock on the hole wall. The rubber tube 3 of the utility model includes a first rubber layer 301, a reinforcing interlayer 302 and a second rubber layer 303 arranged from the inside to the outside. The reinforcing interlayer 302 is made of polyester dipped cord cloth. The rubber and cord cloth are used in combination. After being pressed into a finished product during the vulcanization process of high-temperature steam, the pressure-bearing capacity of the rubber product can be significantly increased. In addition, the cord cloth, as a skeleton material, can enable the rubber product to withstand greater impact loads and strong vibrations, thereby improving the durability and safety of the product, and further improving the wear resistance of the utility model packer.

[0034] In order to increase the friction between the packer and the hole wall rock, the outer surface of the second rubber layer 303 is a rough surface.

[0035] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A downhole drilling water pressure test expandable wear-resistant packer, characterized in that: include: a center rod (1); and A fixed cylinder (2) and a rubber cylinder (3) are coaxially fixedly sleeved on the circumference of the center rod (1) in sequence from the inside to the outside, and clamping rings (4) are sleeved on both ends of the circumference of the rubber cylinder (3) and are respectively abutted against end iron heads (5), and the end iron heads (5) are fixedly connected to the fixed cylinder (2) and are provided with a filling hole (6), and a filling channel (7) is provided in the fixed cylinder (2) for achieving communication between the filling hole (6) and the inner bottom surface of the rubber cylinder (3).

2. The downhole drilling water pressure test expandable wear-resistant packer according to claim 1, characterized in that: The outer wall of the fixing tube (2) is provided with a plurality of annular positioning grooves (8), the annular positioning grooves (8) are arranged opposite to the clamping ring (4), and the two ends of the rubber tube (3) are clamped between the annular positioning grooves (8) and the clamping ring (4).

3. The downhole drilling water pressure test expandable wear-resistant packer according to claim 2, characterized in that: The two ends of the rubber tube (3) are also respectively sleeved with guide rings (9) arranged opposite to the annular positioning groove (8); the two guide rings (9) are respectively arranged on the inner sides of the two clamping rings (4), and the guide rings (9) are fixedly connected to the clamping rings (4).

4. The downhole drilling water pressure test expandable wear-resistant packer according to claim 1, characterized in that: The filling hole (6) comprises a first filling hole (601) and a second filling hole (602) respectively arranged along the axial and radial directions of the end iron head (5); the first filling hole (601) and the second filling hole (602) are connected, and the second filling hole (602) is connected to the filling channel (7).

5. The downhole drilling water pressure test expandable wear-resistant packer according to claim 4, characterized in that: A first sealing ring (10) is provided between the end iron head (5) and the fixed tube (2), and the first sealing ring (10) is located between the second filling hole (602) and the rubber tube (3).

6. The downhole drilling water pressure test expandable wear-resistant packer according to claim 1, characterized in that: A second sealing ring (11) is provided between the fixing cylinder (2) and the center rod (1), and the second sealing ring (11) is located on both sides of the filling channel (7) along the length direction of the center rod (1).

7. The downhole drilling water pressure test expandable wear-resistant packer according to any one of claims 1 to 6, characterized in that: The rubber tube (3) comprises a first rubber layer (301), a reinforcing interlayer (302) and a second rubber layer (303) which are arranged in sequence from the inside to the outside, and the reinforcing interlayer (302) is made of polyester dipped cord fabric.

8. The downhole drilling water pressure test expandable wear-resistant packer according to claim 7, characterized in that: The outer surface of the second rubber layer (303) is a rough surface.

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