Coaxial reversal jet well washing device

Abstract

The invention provides a coaxial reverse jet well washing device which comprises a well washing end, a plurality of connecting joints and a plurality of rotating components, the well washing end is connected with the connecting joints, the connecting joints and the rotating components are arranged at intervals, and one connecting joint located at the tail end is connected with a drill rod; a hollow liquid inlet cavity is formed in the well washing end and the connecting joint which are connected, a plurality of spraying holes are formed in the well washing end and the connecting joint in the circumferential direction, and the spraying holes are communicated with the liquid inlet cavity. A flexible steel wire brush is arranged in the circumferential direction of the connecting joint and used for brushing mud cakes on the well wall. According to the coaxial reverse jetting well washing device, well washing fluid can be jetted in multiple directions, well wall cleaning operation is comprehensive and free of dead corners, and the interior of a well is clean and thorough; the device has the characteristics of convenience, quickness, flexibility and variability in one-time well washing, is suitable for well washing work of hydrological wells in different occasions, and can be widely popularized.

Description

Technical Field

[0001] The present invention relates to the field of geological exploration technology, and in particular to a coaxial reverse jet well-washing device. Background Art

[0002] In the process of conducting geological exploration or hydrological exploration and other related types of work in the field, hydrological exploration type water wells are often drilled. After the drilling of the hydrological exploration wells is completed, the well washing process must be carried out first, and then a water pumping test must be carried out.

[0003] Commonly used well flushing methods include: carbon dioxide well flushing, piston well flushing, and clean water well flushing. However, the cost of carbon dioxide well flushing is relatively high, and the well flushing effects of piston well flushing and clean water well flushing are not thorough enough, resulting in inaccurate subsequent pumping test data, which seriously affects the hydrological exploration results of the survey area. Summary of the invention

[0004] In view of this, the present application aims to propose a coaxial reverse jet well washing device to solve the problem that the well washing effect is poor, resulting in inaccurate subsequent pumping test data, which seriously affects the hydrological exploration results of the survey area.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0006] The present application provides a coaxial reverse jet well washing device, comprising a well washing end head, a connection joint and a rotating member, wherein the well washing end head is connected to the connection joint, a plurality of the connection joints and the rotating member are provided, and the connection joints and the rotating member are arranged at intervals, and a connection joint at the end is connected to a drill pipe;

[0007] After the well-washing end and the connection joint are connected, a hollow liquid inlet cavity is formed inside, and a plurality of injection holes are arranged circumferentially on the well-washing end and the connection joint, respectively, and the injection holes are communicated with the liquid inlet cavity;

[0008] A flexible wire brush is circumferentially arranged on the connection joint, and the flexible wire brush is used for brushing the mud skin on the well wall.

[0009] Further, the end of the well washing end head is a conical structure, the middle part of the well washing end head is a polygonal structure, the injection holes are correspondingly arranged on each end face of the polygonal structure, and the middle part is provided with a first connecting part with a cylindrical structure for connecting with the connecting joint;

[0010] A first inner cavity communicating with the injection hole is provided inside the middle portion of the well washing end head and the first connecting portion.

[0011] Furthermore, the connecting joint body is in a polygonal structure and is arranged corresponding to the middle part of the well washing end head, and the injection hole and the flexible wire brush are arranged correspondingly on each end face of the polygonal structure;

[0012] The connecting section body is provided with a second connecting portion in a cylindrical structure, and the second connecting portion is used to connect with the connecting section body or drill rod of the next section;

[0013] A second inner cavity communicating with the injection hole is provided inside the connecting joint body and the second connecting portion, and the first inner cavity and the second inner cavity form the liquid inlet cavity.

[0014] Furthermore, the first connection portion is provided with an external thread, the connection joint body is provided with an internal thread, and the first connection portion is threadedly connected to the connection joint;

[0015] The second connecting portion is also provided with an external thread and is threadedly connected to the connecting joint or the drill rod.

[0016] Furthermore, a placement space for installing the rotating component is reserved on the first connecting portion and the second connecting portion;

[0017] The rotating component includes a sleeve and a plurality of spiral wings arranged on the sleeve, and the sleeve is assembled to the first connecting part and the second connecting part through a bearing.

[0018] Furthermore, the directions of the spiral wings arranged on two adjacent sheaths are opposite to each other.

[0019] Furthermore, the bearing is a cylindrical roller bearing.

[0020] Compared with the prior art, the coaxial reverse jet well washing device described in this application has the following beneficial effects:

[0021] The coaxial reverse jet well washing device described in the present application adopts a modularly assembled well washing end, as well as a plurality of connecting joints and rotating components. Each group of modules sprays well washing fluid in multiple directions. The well wall cleaning operation is comprehensive without dead angles, and the well is thoroughly clean. The device has the characteristics of convenient, fast, flexible and changeable one-time well washing, is suitable for hydrological well washing work in different occasions, and can be widely promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 This is a schematic structural diagram of a coaxial reverse jet well-washing device according to an embodiment of the present application;

[0024] Figure 2 This is an exploded view of a coaxial reverse jet well-washing device described in an embodiment of the present application;

[0025] Figure 3 This is a cross-sectional view of the well washing end head described in the embodiment of the present application;

[0026] Figure 4 A cross-sectional view of a connection joint according to an embodiment of the present application;

[0027] Figure 5 A top view of the connection joint and the flexible wire brush described in an embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the structure of the rotating component described in an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1-well washing end; 11-first connecting part; 12-first inner cavity; 2-connecting section; 21-second connecting part; 22-second inner cavity; 3-rotating member; 31-sheath; 32-spiral wing; 4-flexible wire brush; 5-cylindrical roller bearing; 6-injection hole. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The words "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprises" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but can be

[0033] Including electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0034] See also Figure 1 and Figure 2As shown, this embodiment provides a coaxial reverse jet well washing device, comprising a well washing end 1, a connection section 2 and a rotating member 3, wherein the well washing end 1 is connected to the connection section 2, a plurality of connection sections 2 and a plurality of rotating members 3 are provided, and the connection sections 2 and the rotating members 3 are arranged at intervals, and a connection section 2 at the end is connected to the drill pipe;

[0035] After the well-washing end head 1 and the connection joint 2 are connected, a hollow liquid inlet cavity is formed inside. A plurality of injection holes 6 are arranged circumferentially on the well-washing end head 1 and the connection joint 2, respectively. The injection holes 6 are connected to the liquid inlet cavity.

[0036] A flexible wire brush 4 is also circumferentially arranged on the connection joint 2, and the flexible wire brush 4 is used to brush the mud skin on the well wall.

[0037] Specifically, in this embodiment, the device is a modular well washing device assembled based on actual site conditions and according to realistic conditions such as the pump head and the thickness of the drill pipe. The device adopts a casing design with a modular assembly structure, and the number of connecting sections 2 and rotating components 3 can be set depending on site conditions, so that it is flexible and convenient to use, convenient for use in a variety of different occasions, easy to assemble, and highly adaptable.

[0038] The well washing fluid enters the liquid inlet chamber and is sprayed out from the injection hole 6 to clean the well wall in all directions without dead angles. At the same time, the turbulence generated by the rotating component 3 makes it more convenient and efficient to flush the mud and dirt on the well wall. The flexible wire brush 4 can brush the mud on the well wall and make it easier to peel off the mud on the well wall. The whole well washing operation process is convenient and fast, and the well washing operation is clean and thorough, which can adapt to the well washing work of hydrological wells in different occasions.

[0039] In some embodiments, Figure 3 As shown, the end of the well washing terminal 1 is a conical structure, the middle part of the well washing terminal 1 is a polygonal structure, the injection holes 6 are correspondingly arranged on each end face of the polygonal structure, and the middle part is provided with a first connecting part 11 in a cylindrical structure for connecting with the connecting section 2;

[0040] A first inner cavity 12 communicating with the injection hole 6 is provided in the middle portion of the well washing end head 1 and inside the first connecting portion 11 .

[0041] Specifically, in the present embodiment, the end of the well washing terminal 1 is a conical structure, which makes it convenient for the casing as a whole to shuttle through the well without causing jamming. The middle part of the well washing terminal 1 is a regular hexagonal structure, which makes it convenient for the operator to tighten the structure so that the casing will not leak and the inner cavity of the casing maintains a positive pressure to keep the structure able to continuously spray flushing fluid. Spray holes 6 are distributed on each face of the regular hexagonal structure, and the spray holes 6 are connected to the first inner cavity 12. The well washing fluid is poured into the first inner cavity 12 and sprayed out from the spray holes 6, so as to achieve the purpose of flushing the well wall.

[0042] In some embodiments, Figure 4 and Figure 5 As shown, the connecting section body is a polygonal structure and is arranged corresponding to the middle part of the well washing end head 1, and the injection hole 6 and the flexible wire brush 4 are arranged correspondingly on each end face of the polygonal structure;

[0043] The connecting section body is provided with a second connecting portion 21 in a cylindrical structure, and the second connecting portion 21 is used to connect with the connecting section body or drill rod of the next section;

[0044] A second inner cavity 22 communicating with the injection hole 6 is provided inside the connecting joint body and the second connecting portion 21, and the first inner cavity 12 and the second inner cavity 22 form a liquid inlet cavity;

[0045] The first connection part 11 is provided with an external thread, and the connection joint body is provided with an internal thread, and the first connection part 11 is threadedly connected with the connection joint 2;

[0046] The second connecting portion 21 is also provided with an external thread and is threadedly connected to the connecting section 2 or the drill rod.

[0047] Specifically, in this embodiment, the number of connecting joints 2 to be installed can be determined based on actual conditions. The first connecting portion 11 is in rolling contact with the cylindrical roller bearing 5, and a rotating component 3 is mounted on the cylindrical roller bearing 5. The male thread of the joint provided on the first connecting portion 11 and the female thread of the joint provided in the connecting joint body are repeatedly threadedly connected in sequence.

[0048] The second connecting portion 21 is also in rolling contact with the cylindrical roller bearing 5. The male thread of the joint provided on the second connecting portion 21 is repeatedly threadedly connected with the female thread of the joint provided in the main body of the next connecting section in sequence. The male thread of the joint on the second connecting portion 21 at the end is connected with the drill pipe. The well washing fluid is sent from the drill pipe to reach the inner cavity of the structural component. The injection hole 6 is connected with the second inner cavity 22. The well washing fluid is poured into the second inner cavity 22 and sprayed out from the injection hole 6 to achieve the purpose of cleaning the well wall.

[0049] When the drill rod rotates, the flexible wire brush 4 can brush the mud skin on the well wall, making it easier to peel off the mud skin on the well wall, which is convenient for cleaning the deep dirt on the well wall. The wire brush is welded to the connecting section body.

[0050] In some embodiments, Figure 3 , Figure 4 and Figure 6 As shown, a placement space for installing the rotating member 3 is reserved on the first connecting portion 11 and the second connecting portion 21;

[0051] The rotating member 3 includes a sleeve 31 and a plurality of spiral wings 32 arranged on the sleeve 31. The spiral wings 32 are evenly distributed on the sleeve 31 at 360 degrees. The directions of the spiral wings 32 arranged on two adjacent sleeves 31 are opposite to each other. The sleeve 31 is assembled to the first connecting part 11 and the second connecting part 21 through a cylindrical roller bearing 5.

[0052] Specifically, in this embodiment, the spiral wings 32 provided on two adjacent rotating components 3 form a coaxial mutually reversing structure, and the counterclockwise spiral wings 32 and the clockwise spiral wings 32 rotate in opposite directions. Both the counterclockwise spiral wings 32 and the clockwise spiral wings 32 are in the form of circular tubes, which is convenient for generating turbulent flow of the well washing fluid and flushing the mud skin on the well wall more cleanly and thoroughly.

[0053] The cylindrical roller bearing 5 is a roller bearing structure composed of five groups of cylindrical structures. Each group of bearing bodies is a roller bearing composed of 38 cylindrical structures. The inner sides of the five groups of cylindrical roller bearings 5 ​​are respectively assembled and connected to the first connecting part 11 or the second connecting part 21, and the outer sides of the cylindrical roller bearings 5 ​​are assembled and connected to the sleeve 31.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0055] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A coaxial reverse jet well washing device, characterized in that: It comprises a well-washing end head, a connection joint and a rotating member, wherein the well-washing end head is connected to the connection joint, a plurality of the connection joints and the rotating member are provided, and the connection joints and the rotating member are arranged at intervals, and a connection joint at the end is connected to the drill pipe; After the well-washing end and the connection joint are connected, a hollow liquid inlet cavity is formed inside, and a plurality of injection holes are arranged circumferentially on the well-washing end and the connection joint, respectively, and the injection holes are communicated with the liquid inlet cavity; A flexible wire brush is circumferentially arranged on the connection joint, and the flexible wire brush is used for brushing the mud skin on the well wall.

2. A coaxial reverse jet well washing device according to claim 1, characterized in that: The end of the well-washing end head is a conical structure, the middle part of the well-washing end head is a polygonal structure, the injection holes are correspondingly arranged on each end face of the polygonal structure, and the middle part is provided with a first connecting part in a cylindrical structure for connecting with the connecting joint; A first inner cavity communicating with the injection hole is provided inside the middle portion of the well washing end head and the first connecting portion.

3. A coaxial reverse jet well washing device according to claim 2, characterized in that: The connecting joint body is in a polygonal structure and is arranged corresponding to the middle part of the well washing end head, and the injection hole and the flexible wire brush are arranged correspondingly on each end face of the polygonal structure; The connecting section body is provided with a second connecting portion in a cylindrical structure, and the second connecting portion is used to connect with the connecting section body or drill rod of the next section; A second inner cavity communicating with the injection hole is provided inside the connecting joint body and the second connecting portion, and the first inner cavity and the second inner cavity form the liquid inlet cavity.

4. A coaxial reverse jet well washing device according to claim 3, characterized in that: The first connection part is provided with an external thread, the connection joint body is provided with an internal thread, and the first connection part is threadedly connected to the connection joint; The second connecting portion is also provided with an external thread and is threadedly connected to the connecting joint or the drill rod.

5. The coaxial reverse jet well washing device according to claim 3 is characterized in that: The first connecting portion and the second connecting portion also reserve a placement space for installing the rotating component; The rotating component includes a sleeve and a plurality of spiral wings arranged on the sleeve, and the sleeve is assembled to the first connecting part and the second connecting part through a bearing.

6. A coaxial reverse jet well-washing device according to claim 5, characterized in that: The directions of the spiral wings arranged on two adjacent sheaths are opposite to each other.

7. The coaxial reverse jet well washing device according to claim 5 is characterized in that: The bearing is a cylindrical roller bearing.

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