Oil well mouth associated gas treatment mechanism

Abstract

The utility model provides an oil well mouth associated gas treatment mechanism. The oil well mouth associated gas treatment mechanism comprises a chemical feeding pipe, an inner cylinder and an outer cylinder which are sequentially connected from inside to outside in a sleeving mode. The top and bottom of the dosing pipe are communicated and arranged in the inner cylinder, the upper part of the dosing pipe extends out of the top of the inner cylinder and the outer cylinder to be connected to the air outlet pipe, and the dosing pipe is used for adding medicaments into the inner cylinder; the inner cylinder is arranged in the outer cylinder and is connected with the inner wall of the top of the outer cylinder, a plurality of separation holes communicated with the outer cylinder are formed in the upper part of the inner cylinder, and a medicament for preventing condensed liquid from freezing is arranged in the bottom of the inner cylinder; a siphon elbow for communicating the inner cylinder with the outer cylinder is arranged on the outer side of the lower part of the inner cylinder; the bottom of the dosing pipe is higher than the top of the siphon elbow; the bottom end of the outer cylinder is connected with an air inlet pipe. According to the structure, the problems that an existing gas separation bag is prone to being frozen and blocked in extremely cold weather, the separation efficiency is low, and manual discharging is needed are solved, the cost of manual maintenance is reduced, and the gas separation bag has the advantages of being simple in structure, high in separation efficiency, reliable in work and easy to achieve.

Description

Technical Field

[0001] This application relates to the field of oilfield production equipment, and in particular to an associated gas treatment mechanism for oil wellheads. Background Technology

[0002] Currently, the handling of associated gas during crude oil extraction remains a major headache for oilfield companies. In extremely cold weather, ordinary gas separators are prone to freezing and clogging the light oil discharge channels due to condensed liquid accumulating at the bottom, requiring manual thawing before discharge. Furthermore, in certain extreme situations, the gas separators become inefficient, allowing moisture to enter the main pipeline and freeze, blocking the lines and impacting production; this is particularly prevalent on unattended platforms. Utility Model Content

[0003] One of the purposes of this application is to provide an associated gas treatment device for oil wellheads, which aims to solve the problems of low separation efficiency of existing gas separators and the need for manual discharge of condensate.

[0004] The technical solution of this application is:

[0005] An associated gas treatment mechanism for an oil wellhead includes a dosing pipe, an inner cylinder, and an outer cylinder, which are sequentially nested from the inside out. The dosing pipe is disposed inside the inner cylinder, with its top and bottom connected, and its upper part extends out of the top of the inner cylinder and the outer cylinder and connects to an outlet pipe. The dosing pipe is used to add chemicals to the inner cylinder. The inner cylinder is disposed inside the outer cylinder and connected to the inner wall of the top of the outer cylinder. The upper part of the inner cylinder has multiple separation holes that communicate with the outer cylinder, and the bottom of the inner cylinder contains chemicals to prevent the condensed liquid from freezing. A siphon bend is provided on the lower outer side of the inner cylinder, connecting the inner cylinder and the outer cylinder. The bottom height of the dosing pipe is higher than the top height of the siphon bend. An inlet pipe is connected to the bottom end of the outer cylinder.

[0006] As one technical solution of this application, the dosing tube, the inner cylinder, and the outer cylinder are coaxially arranged.

[0007] As one technical solution of this application, the outer cylinder and the inner cylinder together form a first gas-liquid separation chamber, and the air inlet pipe is connected to the first gas-liquid separation chamber; the inner cylinder and the dosing pipe together form a second gas-liquid separation chamber, and the air outlet pipe is connected to the second gas-liquid separation chamber through the dosing pipe.

[0008] As one technical solution of this application, a plurality of separation holes are respectively distributed on the peripheral sidewall of the upper part of the inner cylinder, so that the gas entering through the air inlet pipe enters the second gas-liquid separation chamber from the first gas-liquid separation chamber.

[0009] As one technical solution of this application, the siphon bend has an L-shaped bend structure, with its top end connected to the lower part of the inner cylinder and its bottom end connected to the outer cylinder, so that the liquid separated from the inner cylinder is discharged to the bottom of the outer cylinder.

[0010] As one technical solution of this application, the inner cylinder has a hollow cylindrical structure.

[0011] As one technical solution of this application, the dosing tube is a cylindrical structure with an open top and bottom and a hollow interior, and a valve is threadedly connected to the top end.

[0012] As one technical solution of this application, a connecting flange is installed at the end of both the air inlet pipe and the air outlet pipe.

[0013] As one technical solution of this application, the outer cylinder has an internally hollow cylindrical structure.

[0014] The beneficial effects of this application are:

[0015] This device solves the problems of existing gas separators requiring manual discharge and having low separation efficiency and easy freezing blockage in extremely cold weather. It automatically separates and discharges associated gas at the wellhead through a first gas-liquid separation chamber and a second gas-liquid separation chamber formed by a chemical dosing pipe, an inner cylinder, and an outer cylinder connected sequentially from the inside out. This reduces the cost of manual maintenance, meets the needs of unattended operation of the platform, and features simple structure, high separation efficiency, reliable operation, and ease of implementation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of an associated gas treatment mechanism at the wellhead provided in this application embodiment;

[0018] Figure 2 This is a schematic diagram of the outer cylinder provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the first angle of the outer cylinder provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the inner cylinder provided in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the first angle of the inner cylinder provided in an embodiment of this application;

[0022] Figure 6 This is a schematic diagram of the dosing tube provided in an embodiment of this application;

[0023] Figure 7 This is a schematic diagram of the first angle of the dosing tube provided in an embodiment of this application.

[0024] Icons: 1-Dosing pipe; 2-Inner cylinder; 3-Outer cylinder; 4-Outlet pipe; 5-Separation hole; 6-Siphon bend; 7-Inlet pipe; 8-First gas-liquid separation chamber; 9-Second gas-liquid separation chamber; 10-Connecting flange. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Example:

[0033] Please refer to Figure 1 (Refer to) Figures 2 to 7 This application provides an associated gas treatment mechanism for oil wellheads, which mainly includes a dosing pipe 1, an inner cylinder 2, and an outer cylinder 3, which are sequentially connected from the inside to the outside. The dosing pipe 1, the inner cylinder 2, and the outer cylinder 3 are coaxially arranged. The dosing pipe 1 is connected from top to bottom and is located inside the inner cylinder 2. Its upper part extends out of the top of the inner cylinder 2 and the outer cylinder 3 and is connected to the gas outlet pipe 4. The dosing pipe 1 is used to add chemicals to the inner cylinder 2. At the same time, the inner cylinder 2 is located inside the outer cylinder 3 and is connected to the top inner wall of the outer cylinder 3. The upper part of the inner cylinder 2 has multiple separation holes 5 that communicate with the outer cylinder 3, and the bottom is provided with chemicals to prevent the condensed liquid from freezing. In addition, a siphon bend 6 is provided on the lower outer side of the inner cylinder 2 to connect the inner cylinder 2 and the outer cylinder 3. The bottom height of the dosing pipe 1 is higher than the top height of the siphon bend 6. The bottom end of the outer cylinder 3 is connected to the gas inlet pipe 7. Meanwhile, the outer cylinder 3 and the inner cylinder 2 together form the first gas-liquid separation chamber 8, and the air inlet pipe 7 is connected to the first gas-liquid separation chamber 8; the inner cylinder 2 and the dosing pipe 1 together form the second gas-liquid separation chamber 9, and the air outlet pipe 4 is connected to the second gas-liquid separation chamber 9 through the dosing pipe 1.

[0034] It should be noted that in this embodiment, the inner cylinder 2 has a hollow cylindrical structure; multiple separation holes 5 are distributed on the upper peripheral wall of the inner cylinder 2, so that the gas entering through the air inlet pipe 7 enters the second gas-liquid separation chamber 9 from the first gas-liquid separation chamber 8. This mechanism solves the problems of existing gas separators requiring manual discharge and being prone to freezing and blockage in extremely cold weather. It automatically separates and discharges associated gas at the wellhead through the first gas-liquid separation chamber 8 and the second gas-liquid separation chamber 9, which are formed by the dosing pipe 1, the inner cylinder 2, and the outer cylinder 3 connected sequentially from the inside to the outside. This reduces the cost of manual maintenance, meets the needs of unattended operation of the platform, and has the characteristics of simple structure, high separation efficiency, reliable operation, and easy implementation.

[0035] Meanwhile, the siphon bend 6 has an L-shaped bend structure, with its top end connected to the lower part of the inner cylinder 2 and its bottom end connected to the outer cylinder 3, so that the liquid separated from the inner cylinder 2 can be discharged to the bottom of the outer cylinder 3. When gas enters the outer cylinder 3 through the inlet pipe 7 at the bottom of the outer cylinder 3, it initially enters the inner cylinder 2 through the siphon bend 6 and the separation hole 5 respectively. However, at the same time, the gas liquefies into liquid upon encountering the inner walls of the outer cylinder 3 and the inner cylinder 2. As a result, the liquid level in the inner cylinder 2 gradually increases until it is higher than the top of the siphon bend 6. This seals the top of the siphon bend 6, preventing the gas entering through the inlet pipe 7 at the bottom of the outer cylinder 3 from entering the inner cylinder 2 through the siphon bend 6. Therefore, the first function of the siphon bend 6 is to prevent the gas entering the outer cylinder 3 through the inlet pipe 7 from entering the inner cylinder 2 through the siphon bend 6. Its second function is to discharge the condensate deposited in the inner cylinder 2 into the outer cylinder 3.

[0036] It should be noted that in this embodiment, the dosing pipe 1 is a cylindrical structure with an open top and bottom and a hollow interior, and a valve, such as a ball valve, is threaded onto the top end. The dosing pipe 1 is inserted into the interior of the second gas-liquid separation chamber 9, and the liquid in the second gas-liquid separation chamber 9 is collected by the inner cylinder 2 or the cylindrical dosing pipe 1 and enters the lower part of the inner cylinder 2. Furthermore, connecting flanges 10 are installed at the ends of both the inlet pipe 7 and the outlet pipe 4.

[0037] It should be noted that in this embodiment, the outer cylinder 3 has an internally hollow cylindrical structure to facilitate the collection of liquid.

[0038] Therefore, a first gas-liquid separation chamber 8 is formed between the outer cylinder 3 and the inner cylinder 2, a second gas-liquid separation chamber 9 is formed between the inner cylinder 2 and the dosing pipe 1, and the inner cavity of the dosing pipe 1 forms a third gas-liquid separation chamber, thereby effectively improving the efficiency of gas-liquid separation. Furthermore, the air inlet pipe 7 is installed at the bottom of the outer cylinder 3 and communicates with the first gas-liquid separation chamber 8, and the air outlet pipe 4 is installed at the top of the outer cylinder 3 and communicates with the second gas-liquid separation chamber 9. The inner cylinder 2 is installed inside the outer cylinder 3, and the separation hole 5 is located at the top of the inner cylinder 2. Therefore, the gas separated by the first gas-liquid separation chamber 8 can enter the second gas-liquid separation chamber 9 from the first gas-liquid separation chamber 8 for secondary gas-liquid separation, further improving the efficiency of gas-liquid separation. At the same time, the siphon bend pipe 6 is located at the lower part of the inner cylinder 2 to discharge the separated liquid inside to the bottom of the outer cylinder 3, and can also block the channel for the air inlet to directly enter the second gas-liquid separation chamber 9 along the siphon bend pipe 6. Finally, all the separated liquid can be discharged downwards along the air inlet pipe 7 to the wellhead.

[0039] Furthermore, in this embodiment, a first gas-liquid separation chamber 8, a second gas-liquid separation chamber 9, and a third gas-liquid separation chamber are designed to improve the gas-liquid separation effect. In other embodiments, to achieve better drying and separation effects, more gas-liquid separation chambers with different shapes and structures can be provided, and the axes of all separation chambers can be coaxially arranged with the axis of the outer cylinder 3.

[0040] In addition, the agent at the bottom of the inner cylinder 2 can prevent the liquid condensed in the inner cylinder 2 from freezing; in this embodiment, the agent can be calcium chloride, but is not limited to this one agent.

[0041] The mechanism works as follows:

[0042] Gas enters the first gas-liquid separation chamber 8 of the outer cylinder 3 through the inlet pipe 7. Upon encountering the inner wall of the outer cylinder 3, it undergoes the first gas-liquid separation. The condensed liquid drips to the return port (i.e., the inlet) of the outer cylinder 3. The gas then enters the second gas-liquid separation chamber 9 through the separation hole 5 for secondary gas-liquid separation. The condensed liquid drips to the lower part of the inner cylinder 2. The gas then flows upwards along the bottom of the dosing pipe 1 to the outlet pipe 4 for the third stage of separation. The separated liquid flows downwards back to the bottom of the inner cylinder 2. The natural gas then flows through the upper dosing pipe 1 to the outlet pipe 4 and converges. The gas is fed into the natural gas pipeline for recycling. The reagent (calcium chloride) at the bottom of the inner cylinder 2 is dissolved in water, which can prevent the water from freezing at the bottom of the container in extremely cold weather. It also facilitates the condensation of the liquid, which is then discharged into the first gas-liquid separation chamber 8 through the siphon bend 6 and returned to the return port (i.e., the gas inlet). At the same time, calcium chloride reagent can be added to the inner cylinder 2 periodically through the chemical addition valve to complete the treatment and recovery of associated gas at the wellhead. Therefore, this mechanism greatly improves the separation efficiency, saves labor maintenance costs, and is very suitable for use on unattended platforms.

[0043] It should be noted that the antifreeze principle of this device is as follows: by adding agents such as calcium chloride to the inner cylinder 2, the melting point of water is lowered, so that the separated water is not easy to freeze. This solves the problem that the existing gas separator is prone to freezing and blockage in extremely cold weather, reduces the cost of manual maintenance, and meets the needs of unattended operation of the platform. It has the characteristics of simple structure, high separation efficiency, reliable operation and easy implementation.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wellhead associated gas treatment mechanism, characterized in that, The device includes a dosing tube, an inner cylinder, and an outer cylinder, which are sequentially nested from the inside out. The dosing tube is connected to the inner cylinder at both the top and bottom, and extends beyond the top of both the inner and outer cylinders to connect to an air outlet pipe. The dosing tube is used to add a chemical agent to the inner cylinder. The inner cylinder is located inside the outer cylinder and is connected to the inner wall of the top of the outer cylinder. The upper part of the inner cylinder has multiple separation holes that communicate with the outer cylinder, and the bottom of the inner cylinder contains a chemical agent to prevent the condensed liquid from freezing. A siphon bend connecting the inner and outer cylinders is provided on the lower outer side of the inner cylinder, and the bottom of the dosing tube is higher than the top of the siphon bend. An air inlet pipe is connected to the bottom of the outer cylinder.

2. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The dosing tube, the inner cylinder, and the outer cylinder are arranged coaxially.

3. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The outer cylinder and the inner cylinder together form a first gas-liquid separation chamber, and the air inlet pipe is connected to the first gas-liquid separation chamber; the inner cylinder and the dosing pipe together form a second gas-liquid separation chamber, and the air outlet pipe is connected to the second gas-liquid separation chamber through the dosing pipe.

4. The associated gas treatment mechanism at the wellhead of an oil well according to claim 3, characterized in that, Multiple separation holes are distributed on the peripheral sidewall of the upper part of the inner cylinder, so that the gas entering through the air inlet pipe enters the second gas-liquid separation chamber from the first gas-liquid separation chamber.

5. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The siphon bend has an L-shaped bend structure, with its top end connected to the lower part of the inner cylinder and its bottom end connected to the outer cylinder, so that the liquid separated from the inner cylinder can be discharged to the bottom of the outer cylinder.

6. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The inner cylinder has a hollow cylindrical structure.

7. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The dosing tube is a cylindrical structure with an open top and bottom and a hollow interior, and a valve is threadedly connected to the top.

8. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, Both the inlet pipe and the outlet pipe are equipped with connecting flanges at their ends.

9. The associated gas treatment mechanism at the wellhead of an oil well according to claim 1, characterized in that, The outer cylinder has an internally hollow cylindrical structure.

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