Anti-freezing joint
By designing anti-freeze joints, the drilling fluid is separated by valves and discharged through through holes, the problem of freezing and blocking of drilling fluid during cementing is solved, and the effect of avoiding freezing and blocking, ensuring construction quality and reducing safety risks is achieved.
Patent Information
- Application Number
- CN202421624443.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-10
AI Technical Summary
In cold winter areas, the drilling fluid in the casing left on the ground during cementing is prone to freeze, resulting in the casing being frozen and blocked, damage to the casing, affecting the construction quality and posing safety hazards.
An anti-freeze joint is designed, including a hollow columnar joint body, two upper and lower connecting parts and two valves. The drilling fluid on the ground and underground are separated by the valve, and a through hole is set up in the joint body to discharge drilling fluid on the ground to avoid freezing and blockage.
Through the design of this antifreeze joint, the drilling fluid above the antifreeze joint can be easily emptied, avoid casing freezing, ensure construction quality and reduce safety risks.
Smart Images
Figure CN222746041U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pipeline connectors and relates to an antifreeze joint. Background Art
[0002] In oilfield well construction, cementing is a common drilling project. Cementing is an indispensable part of the drilling and completion process. In the cementing process, firstly, the casing is lowered into the wellbore based on the working platform on the ground, and then cement is injected into the annular space between the wellbore and the casing. In order to prevent the casing from being squeezed due to excessive cement pressure, liquid needs to be injected into the casing.
[0003] During the cementing process, casing is lowered with the working platform on the ground as the zero point. At the same time, in order to prevent the casing in the wellbore from falling, a section of casing will be left on the ground, with a length of about 1 to 5 meters. In cold areas in winter, the drilling fluid in the casing left on the ground is easy to freeze, causing the casing to freeze and block, which in turn damages the casing, affects the quality of cementing construction, and leaves safety hazards. Summary of the invention
[0004] The purpose of the utility model is to provide an antifreeze joint to facilitate the draining of drilling fluid in the casing above the antifreeze joint, so as to avoid the freezing and blocking problem of the casing on the ground.
[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:
[0006] An antifreeze joint comprises a hollow cylindrical joint body with two openings, a first connecting piece arranged at the upper end of the joint body and a second connecting piece arranged at the lower end of the joint body, a first valve and a second valve for controlling the connectivity of the joint body are arranged in sequence from top to bottom on the joint body, and at least one through hole is opened on the side wall of the joint body between the first valve and the second valve; a plug adapted thereto is detachably installed in each through hole;
[0007] The joint body is connected to the casing on the cementing ground at the construction site through a first connecting piece, and is connected to the casing in the cementing at the construction site through a second connecting piece.
[0008] As a limitation, the first connecting member is a first internal thread arranged at the upper end of the joint body, and the first internal thread is adapted to the external thread at the lower end of the casing on the cementing ground at the construction site; the second connecting member is a first external thread arranged at the lower end of the joint body, and the first external thread is adapted to the internal thread at the upper end of the casing in the cementing at the construction site.
[0009] As a second limitation, both the first connecting member and the second connecting member are flanges.
[0010] As a third limitation, the first valve is a plug valve or a check valve that is open downward; the second valve is a plug valve or a check valve that is open downward.
[0011] As a fourth limitation, the plug is a threaded plug or a water valve; a second internal thread that matches the external thread of the threaded plug or the external thread of the water valve is provided in the through hole.
[0012] As the utility model adopts the above technical solution, compared with the prior art, the technical progress achieved is:
[0013] (1) The utility model is provided with two valves for separating the drilling fluid above the ground and underground, and a through hole is provided between the two valves for discharging the drilling fluid in the casing on the ground. The utility model can conveniently drain the drilling fluid above the antifreeze joint, thus avoiding the freezing and blocking of the casing on the ground;
[0014] (2) The utility model can connect the aboveground and underground parts of the cementing casing by means of the threaded structure or flange, which is easy to operate;
[0015] (3) The two valves in the utility model adopt plug valves or downward-conducting check valves, which can not only meet the initial injection requirements of cementing, but also prevent the backflow of drilling fluid, effectively separate the drilling fluid above the ground and underground, and provide protection for subsequent drainage; further, a thread plug or a water valve is used as a plug to seal the through hole for drainage, which has a simple structure and is easy to operate for subsequent drainage.
[0016] The utility model belongs to the technical field of pipeline connectors and can conveniently drain drilling fluid in a casing above an antifreeze joint to avoid freezing and blocking of the casing on the ground. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.
[0018] In the attached picture:
[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.
[0020] In the figure: 1, connector body, 2, first valve, 3, second valve, 4, through hole. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0022] Embodiment A kind of antifreeze joint
[0023] like Figure 1 As shown, this embodiment includes a hollow cylindrical joint body 1 with two openings, a first connecting piece arranged at the upper end of the joint body 1, and a second connecting piece arranged at the lower end of the joint body 1. A first valve 2 and a second valve 3 for controlling the connectivity of the joint body 1 are arranged in sequence from top to bottom on the joint body 1. A through hole 4 is opened on the side wall of the joint body 1 between the first valve 2 and the second valve 3; a plug adapted thereto is detachably installed in the through hole 4. Adaptation here means that the plug can block the through hole 4.
[0024] When in use, the joint body 1 is connected to the casing on the cementing ground at the construction site through the first connecting piece, and is connected to the casing in the cementing at the construction site through the second connecting piece.
[0025] Specifically, in this embodiment, the first connector is a first internal thread disposed at the upper end of the connector body 1, and the first internal thread is adapted to the external thread at the lower end of the casing on the cementing ground at the construction site; the second connector is a first external thread disposed at the lower end of the connector body 1, and the first external thread is adapted to the internal thread at the upper end of the casing in the cementing at the construction site. Adaptation here means that the connector body 1 can be threadedly connected with the external thread at the lower end of the casing on the ground through the first internal thread, and can be threadedly connected with the internal thread at the upper end of the casing in the cementing through the first external thread, so as to achieve the above-ground and underground casings being fixed together and connected.
[0026] The first valve 2 and the second valve 3 are both plug valves. The plug is a threaded plug, and a second internal thread that matches the external thread of the threaded plug is provided in the through hole 4. The matching here means that the through hole 4 can be threadedly connected with the external thread of the threaded plug through the second internal thread, so that the two can be detachably fixedly connected, which can not only achieve the blocking of the through hole 4 but also facilitate the subsequent discharge of drilling fluid.
[0027] Method of use: During the cementing operation, first insert the casing into the wellbore section by section through the working platform on the ground, until the upper end of the casing in the wellbore is flush with the ground, then connect the lower end of this embodiment with the upper end of the casing in the wellbore, and then connect the casing on the ground with the upper end of this embodiment. At this time, the plug blocks the through hole 4, the first valve 2 and the second valve 3 are in the open state, and the drilling fluid is injected into the casing; after the injection is completed, close the first valve 2 and the second valve 3 to separate the drilling fluid in the aboveground and underground casings, and then open the plug to discharge the drilling fluid. After the cement in the cementing is solidified, the present embodiment and the casing on the ground can be removed.
[0028] In this embodiment, the first connecting member and the second connecting member may also be flanges. The first valve 2 and the second valve 3 may also be check valves that are open downward. The plug may also be a water valve, in which case the external thread of the water valve should be compatible with the second internal thread provided in the through hole 4. The water valve here refers to a faucet.
[0029] This embodiment is just an example in which the number of through holes 4 is one. In fact, the number of through holes 4 can be increased, and it is only necessary to configure a corresponding number of plugs.
Claims
1. An antifreeze joint, characterized in that: The invention comprises a hollow cylindrical joint body with two openings at both ends, a first connecting piece arranged at the upper end of the joint body and a second connecting piece arranged at the lower end of the joint body, a first valve and a second valve for controlling the connectivity of the joint body are arranged in sequence from top to bottom on the joint body, and at least one through hole is opened on the side wall of the joint body between the first valve and the second valve; a plug adapted thereto is detachably installed in each through hole; The joint body is connected to the casing on the cementing ground at the construction site through a first connecting piece, and is connected to the casing in the cementing at the construction site through a second connecting piece.
2. The antifreeze joint according to claim 1, characterized in that: The first connecting piece is a first internal thread arranged at the upper end of the joint body, and the first internal thread is adapted to the external thread at the lower end of the casing on the cementing ground at the construction site; the second connecting piece is a first external thread arranged at the lower end of the joint body, and the first external thread is adapted to the internal thread at the upper end of the casing in the cementing at the construction site.
3. The antifreeze joint according to claim 1, characterized in that: The first connecting member and the second connecting member are both flanges.
4. An antifreeze joint according to any one of claims 1 to 3, characterized in that: The first valve adopts a plug valve or a check valve that is conducted downward; the second valve adopts a plug valve or a check valve that is conducted downward.
5. An antifreeze joint according to any one of claims 1 to 3, characterized in that: The plug is a thread plug or a water valve; a second internal thread matching the external thread of the thread plug or the external thread of the water valve is arranged in the through hole.
6. The antifreeze joint according to claim 4, characterized in that: The plug is a thread plug or a water valve; a second internal thread matching the external thread of the thread plug or the external thread of the water valve is arranged in the through hole.