CN210714500U - Assembly type recovery joint containing crude oil of fracturing fluid - Google Patents

Abstract

The utility model relates to an assembled recovery joint containing fracturing liquid crude oil, which at least comprises a first casing body and a second casing body, wherein the first casing body is provided with a first air passage, a first oil passage and the The first oil pipe communicated with the first oil passage, the second casing is provided with a second air passage, a second oil passage and a second oil pipe communicated with the second oil passage, and the second oil pipe can extend into In the first oil passage, the first sleeve body is provided with a first stepped hole communicating with the first oil passage, and the first stepped hole and the first stepped shaft on the second oil pipe cooperate with each other , so that when the first air passage and the second air passage are connected to each other through the air passage connecting body provided with the third air passage, the first oil passage can pass through the second oil pipe and The second oil passage is sealed and conducted.

Description

An assembled recovery joint for crude oil containing fracturing fluid

technical field

The utility model relates to the technical field of environmental protection devices, in particular to an assembled recovery joint containing fracturing fluid crude oil.

Background technique

Fracturing technology is the core technical means to enhance oil recovery in current oil and gas wells. Fracturing fluid is the fluid used in the fracturing process of fluid minerals (gas, steam, oil, fresh water, salt water, hot water, etc.) in order to obtain high production by borrowing liquid conductivity (such as hydraulic power, etc.). The recovery technology of crude oil containing fracturing fluid is an important environmental protection technology, which needs to pressurize the waste crude oil of fracturing fluid to improve the recovery efficiency of crude oil of fracturing fluid.

For example, a mobile fracturing fluid crude oil recovery device is disclosed in Chinese Patent Publication No. CN206280055U. It includes a plurality of sleeves, the upper side of the sleeve is provided with a clamping groove, the inside of the sleeve is symmetrically provided with trachea on both sides, the middle of the sleeve is provided with a recovery hole, the top of the sleeve is fixed with a limit tube, and the inside of the limit tube is A through hole is opened, the through hole and the recovery hole pass through, a number of elastic hinges are fixed on the side wall of the casing, the lower end of the elastic hinge is connected with an upper connecting rod, the lower part of the upper connecting rod is fixed with a rigid spring, and the lower end of the rigid spring is fixed There is a lower link.

The working principle of the utility model is as follows: when working, the casing pipe sections are connected together, the special-shaped block is placed above the trachea, and then another casing is sleeved on, and the card joint can be well stuck in the card groove. , place the device at the source of the waste fracturing fluid, and then pressurize the inside through the gas pipe. The air flow passes through the gas pipe and the gas hole in turn, and the pressure is applied to the source of the waste fracturing fluid. The waste fracturing fluid can be recovered through the recovery pipe and through hole. Since the special-shaped block is in the shape of a circular cone, it will be automatically centered and connected between the trachea, and it will be more quickly and quickly folded.

However, this new type of use has at least the following shortcomings: during the recovery process, the flow state of the fracturing fluid crude oil is an unstable flow state, which is prone to dynamic loads, and there is no sealing structure between the limit hole and the recovery hole, which is easy to cause pressure. Cracked crude oil is easy to leak. Fracturing fluids often contain complex components such as tackifiers, cross-linking agents, gel breakers and fungicides. If they leak, they will directly lead to serious pollution problems and ecological damage problems, such as soil compaction, salinization and sterilization. Surface water pollution.

Utility model content

In view of the deficiencies of the prior art, the utility model provides an assembled recovery joint containing fracturing fluid crude oil, which at least includes a first casing body and a second casing body, wherein the first casing body is provided with a first air passage, A first oil passage and a first oil pipe communicating with the first oil passage, a second air passage, a second oil passage and a second oil pipe communicating with the second oil passage are arranged in the second casing, so The second oil pipe can extend into the first oil passage, the first sleeve body is provided with a first stepped hole that communicates with the first oil passage, and the first stepped hole is connected to the second oil pipe. The first step shafts on the upper part are matched with each other, so that when the first air passage and the second air passage are connected to each other through the air passage connecting body provided with the third air passage, the first oil passage The second oil pipe and the second oil passage can be sealed and conducted through the second oil pipe.

According to a preferred embodiment, at least two radial sealing surfaces and one axial sealing surface are formed between the first stepped hole and the stepped shaft.

According to a preferred embodiment, the first stepped hole and the stepped shaft are in interference fit.

According to a preferred embodiment, both ends of the airway connecting body extend into the first airway and the second airway respectively in a sealed form.

According to a preferred embodiment, the utility model also discloses an assembled recovery joint for crude oil containing fracturing fluid, which at least includes a first casing body, a second casing body and an air passage connection provided with a third air passage The first casing is provided with a first air passage, a first oil passage and a first oil pipe communicating with the first oil passage, and the second casing is provided with a second air passage and a second oil passage and a second oil pipe communicating with the second oil passage, the first sleeve body is provided with a second stepped hole communicating with the first air passage, and the second stepped hole is connected to the air passage connecting body The second stepped shafts on the upper part are matched with each other, so that when the first oil passage is communicated with the second oil passage through the second oil pipe, the first air passage can communicate with the second air passage. The channel seal is turned on.

According to a preferred embodiment, the air passage connecting body further includes a third stepped shaft, and the third stepped shaft is connected to a third stepped hole on the second sleeve body that communicates with the second air passage. cooperate with each other.

According to a preferred embodiment, a first sealing ring is provided between the third stepped shaft and the third stepped hole; and/or a first sealing ring is provided between the second stepped hole and the second stepped shaft Two sealing rings.

According to a preferred embodiment, the present invention also discloses an assembled recovery joint for crude oil containing fracturing fluid, wherein the outer wall of the first casing is connected with a first clamp, and the second casing is A second clamp is connected to the outer wall of the casing, and under the condition that an axial force is applied between the first clamp and the second clamp through the connecting member, the second oil pipe in the second sleeve and the first The first oil passage in the casing can be sealed and conducted; and/or the first air passage in the first casing is sealed and guided through the air passage connecting body and the second air passage in the second casing. Pass.

According to a preferred embodiment, the first clamp includes a first clamp A and a first clamp B, and one end of the first clamp A has a first clamp for connecting with the first clamp B. The first boss is matched with the two concave holes, and the other end of the first clamp A has a first concave hole for matching with the second boss on the first clamp B.

According to a preferred embodiment, the first clamp and the second clamp are respectively provided with threaded holes, and the threaded holes are connected with the connecting member.

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

The elastic hinge and spring fixation in the prior art will cause large elastic deformation when subjected to the dynamic load of the system, which may cause the fixation failure, thereby leading to the leakage of fracturing fluid and crude oil. However, the utility model adopts rigid fixation, which will only deform slightly when it is subjected to system dynamic load, and will not cause its fixation failure, thereby not causing the leakage of fracturing fluid and crude oil, and the sealing ring takes into account both sealing and shock absorption. Effect. After the first clamp and the second clamp exert an axial force through the stud locking, the sealing ring will be deformed to a certain extent, so as to realize the tight fit between the third stepped shaft and the third stepped hole, and realize the second stepped hole and the third stepped hole. A tight fit between the shafts of the second step.

Description of drawings

Fig. 1 is the assembly schematic diagram of the recovery joint provided by the utility model;

Fig. 2 is a kind of preferred second cover body provided by the present utility model;

Fig. 3 is a kind of preferred first cover body provided by the present utility model;

Figure 4 is a preferred airway connector provided by the present invention; and

5 is a schematic diagram of the assembly of a preferred recovery joint provided by the present utility model;

6 is a schematic structural diagram of a preferred first clamp provided by the present invention;

FIG. 7 is a schematic structural diagram of a preferred first clamp A provided by the present invention.

List of reference signs

100: First body 200c: Second tubing

200: Second body 200d: Third step hole

300: Airway connector 200c-1: First step shaft

400: First clamp 300a: Third airway

500: Second clamp 300b: Second step shaft

100a: first airway 300c: third stepped shaft

100b: The first oil passage 400a: The first clamp A

100c: The first oil pipe 400b: The first clamp B

100d: The first step hole 400a-1: The first boss

100e: Second stepped hole 400a-2: First recessed hole

200a: Second air passage As: Axial sealing surface

200b: Second oil passage Rs: Radial sealing surface

Detailed ways

A detailed description will be given below in conjunction with the accompanying drawings 1-7.

Example 1

This embodiment discloses an assembled recovery joint for crude oil containing fracturing fluid, which at least includes a first casing body 100 and a second casing body 200 . Preferably, the recovery joint includes a first sleeve body 100 and a second sleeve body 200 . As shown in FIG. 1 , the first casing 100 is provided with a first air passage 100a and a first oil passage 100b. Preferably, the first sleeve body 100 is further integrally connected with a first oil pipe 100c communicating with the first oil passage 100b. The first oil pipe 100c communicates with the external pipeline. The second casing 200 is provided with a second air passage 200a, a second oil passage 200b, and a second oil pipe 200c communicating with the second oil passage 200b. The second oil pipe 200c can extend into the first oil passage 100b.

As shown in FIG. 3 , the first casing 100 is provided with a first stepped hole 100d that communicates with the first oil passage 100b. The diameter of the first stepped hole 100d is larger than the diameter of the first oil passage 100b. The second oil pipe 200c and the first stepped shaft 200c-1 are fitted with each other. Preferably, the second oil pipe 200c and the first stepped shaft 200c-1 are in an interference fit with each other. During the assembly process, firstly, one end of the airway connecting body 300 is extended and installed in the first airway 100a, and then the other end of the airway connecting body 300 is extended and installed in the second airway 200a, so as to realize the first airway The channel 100a and the second air channel 200a are connected through the air channel connecting body 300 provided with the third air channel 300a. As shown in FIG. 1 , after the other end of the air passage connecting body 300 is extended and installed to the third air passage 300 a, the second oil pipe 200 c can also extend into the first oil passage 100 b. Since the second oil pipe 200c and the first stepped shaft 200c-1 cooperate with each other to form a sealing surface, the first oil passage 100b can be sealed and conducted through the second oil pipe 200c and the second oil passage 200b. According to the arrangement of the present invention, when the second oil pipe 200c extends into the second oil passage 200b, since the second oil pipe 200c and the first stepped shaft 200c-1 cooperate with each other to form a sealing surface, the first oil passage 100b can be connected to the The second oil passage 200b is sealed and connected, and when the crude oil containing the fracturing fluid enters the recovery joint, it will not leak to the outside, thereby reducing its pollution to the environment. In addition, in the case where the second oil pipe 200c and the first stepped shaft 200c-1 cooperate with each other to form a sealing surface, the diameters of the first oil passage 100b, the second oil pipe 200c and the second oil passage 200b can be almost the same, thereby reducing the The oil pressure mutation rate of the crude oil containing fracturing fluid during transportation, thereby reducing the dynamic load on the entire recovery joint.

Preferably, at least two radial sealing surfaces Rs and one axial sealing surface As are formed between the first stepped hole 100d and the stepped shaft 200c-1. Preferably, as shown in FIG. 3 , the first stepped hole 100d is in a “convex” shape. As shown in FIG. 2 , the first stepped shaft 200c-1 is also in a “convex” shape. In this way, the first stepped hole 100d and the stepped shaft 200c-1 will form two radial sealing surfaces Rs and two axial sealing surfaces As shown in FIG. 1 . In addition, according to actual requirements, the first stepped hole 100d and the stepped shaft 200c-1 may have radial surfaces and axial surfaces thereof, respectively, so as to form multiple radial sealing surfaces Rs and multiple axial sealing surfaces As. When the flow rate, pressure or flow rate of the crude oil containing fracturing fluid is uneven, the multiple sealing surfaces formed between the first step hole 100d and the step shaft 200c-1 are difficult to seal due to the large molecular weight of the crude oil containing fracturing fluid. Leaks from seal faces, which help prevent leakage of oil containing fracturing fluids under dynamic loads.

Example 2

This embodiment is a further supplement or replacement of Embodiment 1. The technical features that are the same or equivalent to those in Embodiment 1 will not be repeated here.

Preferably, both ends of the airway connecting body 300 extend into the first airway 100a and the second airway 200a in a sealed manner, respectively. Preferably, the first sleeve body 100 is provided with a second stepped hole 100e communicating with the first air passage 100a, and the second stepped hole 100e and the second stepped shaft 300b on the air passage connecting body 300 are matched with each other, so that in the first When the first oil passage 100b is connected to the second oil passage 200b through the second oil pipe 200c, the first air passage 100a can be sealed and conducted with the second air passage 200a. The matching manner of the second stepped hole 100e and the second stepped shaft 300b may be in accordance with the matching manner between the first stepped hole 100d and the stepped shaft 200c-1 to form the axial direction between the second stepped hole 100e and the second stepped shaft 300b. sealing face and radial sealing face. This helps prevent gas leaks when injecting gas into oil containing fracturing fluids. In addition, in this way, the sizes of the third airway 300a, the second airway 200a, and the first airway 100a can be almost the same. For example, the outer walls of the third air passage 300a are respectively attached to the inner walls of the second air passage 200a and the first air passage 100a. This helps the gas flow through the airway connecting body 300 without generating axial pressure on the airway connecting body 300 or generating a vortex at the connection between the airways.

Preferably, as shown in FIG. 4 , the airway connecting body 300 further includes a third stepped shaft 300c. The third stepped shaft 300c and the third stepped hole 200d on the second sleeve body 200 which communicate with the second air passage 200a are matched with each other. Setting in this way is beneficial to reduce the processing difficulty of each sleeve, and the airway connecting body 300 can be independent as a component, which is convenient for easy disassembly of the recovery joint during field operation and easy to carry. At the same time, it can also ensure that gas leakage is prevented when gas is injected into the oil containing fracturing fluid.

Preferably, as shown in FIG. 1 , a first sealing ring is provided between the third stepped shaft 300c and the third stepped hole 200d. And/or a second sealing ring is provided between the second stepped hole 100e and the second stepped shaft 300b. The purpose of setting the first sealing ring and the second sealing ring is mainly: 1. The first sealing ring and the second sealing ring are elastic and can absorb the dynamic load caused by the unstable flow of the fluid in the sleeve; 2. Due to the airway connection The body 300 needs to be installed first, and it is a clearance fit or transition fit with the third step hole 200d and/or the second step shaft 300b. The installation of the sealing ring is mainly to achieve the third step shaft 300c and the third step hole 200d. The tight fit between the second stepped hole 100e and the second stepped shaft 300b is realized, and the gas leakage is further prevented.

Example 3

This embodiment is a further supplement or replacement of Embodiment 1 and/or 2. The technical features that are the same or equivalent to those in Embodiments 1 and/or 2 will not be repeated here.

Preferably, as shown in FIG. 5 , a first clamp 400 is connected to the outer wall of the first sleeve body 100 . The first clamp 400 includes a first clamp A400a and a first clamp B400b. One end of the first clamp A400a has a first boss 400a-1 for matching with the second concave hole on the first clamp B400b. The other end of the first clamp A400a has a first concave hole 400a-2 for matching with the second boss on the first clamp B400b.

The second clamp 500 and the first clamp 400 belong to the same component, and its structure is the same as that of the first clamp 400 . The only difference is that the first clamp 400 is installed on the first sleeve body 100 , and the second clamp 500 is installed in the second sleeve body 200 . As shown in FIG. 6 , an annular convex body is integrally formed on the inner side of the first clamp 400 . The annular convex body is matched with the annular concave groove on the first sleeve body 100 , so that the first clamp 400 is installed on the ground sleeve body. The second clamp 500 is mounted on the second sleeve body 200 according to the same structure.

The first clamp 400 and the second clamp 500 are respectively provided with threaded holes, and the threaded holes are connected with the connecting member 600. For example, the connecting member 600 may be a stud. As shown in FIG. 5 , the stud connects the first clamp 400 sleeved on the first sleeve body 100 with the second clamp 500 sleeved on the second sleeve body, and the two ends of the stud are connected to the first clamp through screws. The hoop 400 and the second clamp 500 exert an axial force, so that the second oil pipe 200c and the first oil passage 100b can be sealed and conducted. And/or the first airway 100a is sealed and connected to the second airway 200a through the airway connecting body 300 .

The elastic hinge and spring fixation in the prior art will cause large elastic deformation when subjected to the dynamic load of the system, which may cause the fixation failure, thereby leading to the leakage of fracturing fluid and crude oil. However, the utility model adopts rigid fixation, which will only deform slightly when it is subjected to system dynamic load, and will not cause its fixation failure, thereby not causing the leakage of fracturing fluid and crude oil, and the sealing ring takes into account both sealing and shock absorption. Effect. After the first clamp 400 and the second clamp 500 apply an axial force through the stud locking, the sealing ring will be deformed to a certain extent, so as to realize the tight fitting between the third stepped shaft 300c and the third stepped hole 200d. A tight fit between the second stepped hole 100e and the second stepped shaft 300b.

Working principle: The recovery joint provided by the utility model can be assembled as follows:

First, extend one end of the airway connector 300 (adhered with the second sealing ring) into the first airway 100a, and then extend the other end of the airway connector 300 (adhered with the first sealing ring). Installed in the second airway 200a, the first airway 100a and the second airway 200a are connected through the airway connecting body 300 provided with the third airway 300a. After the other end of the air passage connecting body 300 is extended and installed to the third air passage 300a, the second oil pipe 200c can also extend into the first oil passage 100b at the same time.

Next, the first clamp A400a is sleeved on the first sleeve body 100, the first clamp B400b is sleeved on another part of the first sleeve body 100, and the sleeve is sleeved on the first sleeve through the cooperation of the concave hole and the boss. The first clamp 400 of the body 100 . The second clamp 500 is mounted on the second sleeve body 200 in the same manner. Then screw the stud in the threaded hole and lock it with the bolt.

There are also different embodiments of the present invention. For example, the present invention is not limited to the second cover body 200 and the first cover body 100 , but can also include a third cover body with the same structure as the second cover body 200 and the first cover body 100 . The assembly method of the second sleeve body 200 may refer to the assembly method of the second sleeve body 200 and the first sleeve body 100 .

It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the scope of the present invention. into the scope of protection of the present invention. It should be understood by those skilled in the art that the description of the present utility model and the accompanying drawings are illustrative rather than limiting to the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. An assembled recovery joint containing crude oil of fracturing fluid at least comprises a first sleeve body (100), a second sleeve body (200) and an air duct connecting body (300);

a first air channel (100a) and a first oil channel (100b) are arranged in the first sleeve body (100);

the second sleeve body (200) is provided with a second air passage (200a), a second oil duct (200b) and a second oil pipe (200c) communicated with the second oil duct (200b),

the second oil pipe (200c) is extendable into the first oil passage (100b),

it is characterized in that the preparation method is characterized in that,

the first sleeve (100) is provided with a first stepped hole (100d) communicating with the first oil passage (100b), and the first stepped hole (100d) and a first stepped shaft (200c-1) on the second oil pipe (200c) are fitted to each other, so that the first oil passage (100b) can be sealingly communicated through the second oil pipe (200c) and the second oil passage (200b) in a state where the first air passage (100a) and the second air passage (200a) are communicated with each other through the air passage connecting body (300) provided with a third air passage (300 a).

2. The recovery sub of claim 1, wherein at least two radial seal surfaces (Rs) and one axial seal surface (As) are formed between the first stepped bore (100d) and the first stepped shaft (200 c-1).

3. The recovery sub according to claim 1 or 2, wherein the first stepped bore (100d) and the first stepped shaft (200c-1) are interference fitted.

4. The recovery sub according to claim 3, wherein both ends of the air passage connecting body (300) extend into the first air passage (100a) and the second air passage (200a) in a sealed manner, respectively.

5. An assembled recovery joint containing crude oil of fracturing fluid at least comprises a first sleeve body (100), a second sleeve body (200) and an air passage connecting body (300) provided with a third air passage (300a),

a first air channel (100a) and a first oil channel (100b) are arranged in the first sleeve body (100);

the second sleeve body (200) is provided with a second air passage (200a), a second oil duct (200b) and a second oil pipe (200c) communicated with the second oil duct (200b),

it is characterized in that the preparation method is characterized in that,

the first sleeve body (100) is provided with a second stepped hole (100e) communicated with the first air passage (100a), and the second stepped hole (100e) is matched with a second stepped shaft (300b) on the air passage connecting body (300) so that the first air passage (100a) can be communicated with the second air passage (200a) in a sealing way under the condition that the first oil passage (100b) is communicated with the second oil passage (200b) through the second oil pipe (200 c).

6. The recycling joint according to claim 5, wherein said air passage connecting body (300) further comprises a third step shaft (300c), said third step shaft (300c) and a third step hole (200d) of said second housing (200) communicating with said second air passage (200a) are fitted to each other.

7. The recovery sub of claim 6, wherein a first seal ring is disposed between the third stepped shaft (300c) and the third stepped bore (200 d); and/or

And a second sealing ring is arranged between the second stepped hole (100e) and the second stepped shaft (300 b).

8. An assembled recovery joint containing crude oil of fracturing fluid at least comprises a first sleeve body (100), a second sleeve body (200) and an air passage connecting body (300) provided with a third air passage (300a),

it is characterized in that the preparation method is characterized in that,

the outer wall surface of the first sleeve body (100) is connected with a first clamp (400), the outer wall surface of the second sleeve body (200) is connected with a second clamp (500), and under the condition that axial force is applied between the first clamp (400) and the second clamp (500) through a connecting component (600), a second oil pipe (200c) in the second sleeve body (200) and a first oil duct (100b) in the first sleeve body (100) can be communicated in a sealing mode; and/or a first air channel (100a) in the first sleeve body (100) is in sealed communication with a second air channel (200a) in the second sleeve body (200) through the air channel connecting body (300).

9. The recovery joint according to claim 8, wherein the first clip (400) comprises a first clip A (400a) and a first clip B (400B), wherein one end of the first clip A (400a) has a first boss (400a-1) for mating with a second recess hole on the first clip B (400B),

the other end of the first clamp A (400a) is provided with a first concave hole (400a-2) used for being matched with a second boss on the first clamp B (400B).

10. The recovery connection according to claim 8 or 9, characterized in that the first clip (400) and the second clip (500) are provided with threaded holes, respectively,

the screw hole is connected with the connection member (600).

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