阅读说明：本技术 单向流动工具和油管 (One-way flow tool and tubing ) 是由 陈家晓 叶长青 孙风景 彭杨 段蕴琦 王威林 朱鹏 熊杰 林生茂 王庆蓉 蒋密 于 2018-05-28 设计创作，主要内容包括：本发明公开了一种单向流动工具和油管,属于油气田设备领域。所述工具包括：阀座、阀芯和剪切环。阀座内设置有连接在一起的第一腔室和第二腔室,第一腔室与油管连通,第二腔室与油套环空连通,且第二腔室的内径小于第一腔室的内径。剪切环固定在第一腔室内；阀芯包括：连接在一起的剪切段和封堵段,剪切段的自由端剪切环连接,封堵段位于第二腔室内,且封堵段的外径与第二腔室的内径相适配。剪切环剪断后,阀芯轴向移动,封堵段移动至第一腔室内,用于使气体或者泡排剂从油套环空中顺次经过第二腔室、第一腔室进入油管内。本发明通过注入气体或泡排剂憋压即可使剪切环剪断进而使油套环空与油管连通,操作较简单,提高生产效率。(the invention discloses a unidirectional flow tool and an oil pipe, and belongs to the field of oil and gas field equipment. The tool comprises: valve seat, case and shear ring. Be provided with the first cavity and the second cavity that link together in the disk seat, first cavity and oil pipe intercommunication, second cavity and the annular intercommunication of oil jacket, and the internal diameter of second cavity is less than the internal diameter of first cavity. The shearing ring is fixed in the first cavity; the spool includes: the shearing section and the plugging section are connected together, the free end shearing ring of the shearing section is connected, the plugging section is located in the second cavity, and the outer diameter of the plugging section is matched with the inner diameter of the second cavity. After the shearing ring is sheared off, the valve core moves axially, and the plugging section moves into the first cavity and is used for enabling gas or foam discharging agent to enter the oil pipe through the second cavity and the first cavity in sequence from the air of the oil sleeve ring. The invention can cut the shearing ring by injecting gas or foam discharging agent to suppress pressure, so that the oil sleeve annulus is communicated with the oil pipe, the operation is simpler, and the production efficiency is improved.)

1. A unidirectional flow tool, the tool comprising: the valve comprises a valve seat (1), a valve core (2) and a shearing ring (3);

a first cavity (4) and a second cavity (5) which are connected together are arranged in the valve seat (1), the first cavity (4) is communicated with an oil pipe, the second cavity (5) is communicated with an oil sleeve annulus, and the inner diameter of the second cavity (5) is smaller than that of the first cavity (4);

The shear ring (3) is fixed in the first chamber (4);

the spool (2) includes: the shearing section (21) and the blocking section (22) are connected together, the free end of the shearing section (21) is connected with the shearing ring (3), the blocking section (22) is positioned in the second chamber (5), and the outer diameter of the blocking section (22) is matched with the inner diameter of the second chamber (5);

after the shearing ring (3) is sheared, the valve core (2) moves axially, and the plugging section (22) moves into the first cavity (4) and is used for enabling gas or foam discharging agent to sequentially pass through the second cavity (5) and the first cavity (4) in the air of the oil sleeve ring and enter the oil pipe.

2. tool according to claim 1, characterized in that the shear segment (21) comprises: a hollow section (211) and a reducer section (212), the reducer section (212) being arranged between the hollow section (211) and the plugging section (22);

The reducing section (212) is provided with a through hole (2121) communicated with the hollow section (211).

3. The tool according to claim 2, wherein the hollow section (211) comprises a first hollow section (2111) and a second hollow section (2112), the first hollow section (2111) having an outer diameter smaller than the outer diameter of the second hollow section (2112), the free end of the first hollow section (2111) being connected to the shear ring (3);

An annular space is formed between the first hollow section (2111) and the first chamber (4), and an elastic part (6) is arranged between the second hollow section (2112) and the shear ring (3) in the annular space.

4. a tool according to claim 3, characterized in that the first chamber (4) comprises a first section (41), a second section (42) and a third section (43) of successively increasing internal diameter, formed in sequence, the first section (41) communicating with the oil pipe, the second chamber (5) having an internal diameter smaller than the third section (43);

The outer diameter of the first hollow section (2111) is matched with the inner diameter of the second section (42), and the outer diameter of the second hollow section (2112) is matched with the inner diameter of the third section (43);

the shear ring (3) is arranged between the second section (42) and the third section (43).

5. The tool according to claim 1, further comprising a bonnet (7);

Valve cap (7) set up the one end of valve seat (1), just be provided with through-hole (71) on valve cap (7), make second cavity (5) with oil jacket annular intercommunication.

6. Tool according to claim 1, characterized in that the valve seat (1) comprises: a shear valve seat (11) and a seal valve seat (12) connected together;

the first chamber (4) is arranged in the shear valve seat (11) and the second chamber (5) is arranged in the sealing valve seat (12).

7. a tool according to claim 1, wherein one end of the valve seat (1) is a threaded end for connecting the one-way flow tool to a tubing.

8. an oil pipe comprising the unidirectional flow tool of any of claims 1-7.

9. the oil pipe of claim 8, wherein the oil pipe comprises a gas lift mandrel, and the unidirectional flow tool is disposed on a sidewall of the gas lift mandrel.

Technical Field

the invention relates to the field of oil and gas field equipment, in particular to a unidirectional flow tool and an oil pipe.

background

During the production of gas wells, tubing with permanent packers is typically run into the casing of the gas well for production. In being fixed in the sleeve pipe with oil pipe through the packer, and the packer is located the top on producing the layer, plays fixed and sealed effect, makes the natural gas in the producing layer flow to the well head through oil pipe and carries out natural gas exploitation.

In the initial stage of gas well development, the formation pressure is high, and the underground natural gas spontaneously enters the oil pipe under the action of the formation pressure and is produced through the oil pipe. In the process of natural gas exploitation, water in the natural gas is gradually accumulated in the oil pipe to form accumulated water. In the later stage of gas well development, due to the influence of the formation pressure reduction and the water accumulation pressure, natural gas in a production layer cannot enter an oil pipe spontaneously to be discharged, and the pressure of the water accumulation in the oil pipe needs to be eliminated. When the pressure of accumulated water is eliminated, a perforation tool is put into the oil pipe, perforation is carried out on the oil pipe at a position close to the upper part of the packer to enable the oil pipe to be communicated with an oil sleeve annulus (an annular space between the oil pipe and a sleeve), then gas is injected into the oil sleeve annulus, the gas enters the oil pipe from a hole in the oil pipe, and under the pressure action of the gas, the accumulated water in the oil pipe is lifted to the earth surface, so that the pressure of the accumulated water on a production layer is eliminated. Or injecting a foam discharging agent into the hollow part of the oil sleeve, wherein the foam discharging agent enters the oil pipe from a hole on the oil pipe, and discharging accumulated water in the oil pipe to the ground surface through the foam discharging agent to perform foam discharging, water discharging and gas recovery.

The prior art of the inventor has at least the following problems:

communicating the tubing with the casing through the perforations can destroy the integrity of the tubing and running a perforation tool to drill the holes affects production efficiency.

disclosure of Invention

the embodiment of the invention provides a unidirectional flow tool and an oil pipe, which can solve the technical problem. The specific technical scheme is as follows:

In a first aspect, there is provided a unidirectional flow tool, the tool comprising: a valve seat, a valve core and a shearing ring;

A first cavity and a second cavity which are connected together are arranged in the valve seat, the first cavity is communicated with the oil pipe, the second cavity is communicated with the oil sleeve annulus, and the inner diameter of the second cavity is smaller than that of the first cavity;

The shear ring is fixed in the first cavity;

The valve core includes: the free ends of the shearing sections are connected with the shearing ring, the plugging section is positioned in the second cavity, and the outer diameter of the plugging section is matched with the inner diameter of the second cavity;

After the shearing ring is sheared, the valve core moves axially, the plugging section moves into the first cavity, and gas or foam discharging agent is used for sequentially passing through the second cavity and the first cavity from the oil sleeve ring in the air and entering the oil pipe.

In one possible design, the shear segment includes: the diameter-changing section is arranged between the hollow section and the plugging section;

The reducing section is provided with a through hole communicated with the hollow section.

in one possible design, the hollow section comprises a first hollow section and a second hollow section, the outer diameter of the first hollow section is smaller than that of the second hollow section, and the free end of the first hollow section is connected with the shearing ring;

An annular space is formed between the first hollow section and the first cavity, and an elastic piece is arranged between the second hollow section and the shearing ring in the annular space.

In one possible design, the first chamber comprises a first section, a second section and a third section which are sequentially formed, wherein the inner diameters of the first section, the second section and the third section are sequentially increased, the first section is communicated with the oil pipe, and the inner diameter of the second chamber is smaller than that of the third section;

The outer diameter of the first hollow section is matched with the inner diameter of the second section, and the outer diameter of the second hollow section is matched with the inner diameter of the third section;

The shear ring is disposed between the second segment and the third segment.

In one possible design, the tool further includes a bonnet;

the valve cap sets up the one end of disk seat, just be provided with the through-hole on the valve cap, make the second cavity with oil jacket annular space intercommunication.

in one possible design, the valve seat comprises: a shear valve seat and a seal valve seat connected together;

the first chamber is disposed within the shear valve seat and the second chamber is disposed within the seal valve seat.

In one possible design, one end of the valve seat is a threaded end for connecting the one-way flow tool to the tubing.

In a second aspect, there is provided a tubing comprising a unidirectional flow tool as described in any above.

in one possible design, the oil pipe includes a gas lift mandrel, and the unidirectional flow tool is disposed on a sidewall of the gas lift mandrel.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

according to the unidirectional flow tool provided by the embodiment of the invention, the valve core is connected with the shearing ring to enable the plugging section to be in sealing contact with the second chamber, so that the oil pipe is not communicated with the oil sleeve annulus at the initial stage of gas production. When gas lift or foam drainage water drainage gas production is required, gas or foam drainage agent is injected through the oil sleeve annulus, so that the shearing ring is sheared under the action of pressure, and the gas or the foam drainage agent can enter an oil pipe. The one-way flow tool provided by the embodiment of the invention realizes the communication between the oil sleeve annulus and the oil pipe, the integrity of the oil pipe cannot be damaged, and the shearing ring can be sheared by injecting gas or foam exhausting agent to suppress pressure, so that the oil sleeve annulus is communicated with the oil pipe, the operation is simple, and the production efficiency is improved.

drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a unidirectional flow tool provided in an embodiment of the present invention.

The reference numerals denote:

1-a valve seat, wherein the valve seat is provided with a valve seat,

11-cutting the valve seat, namely cutting the valve seat,

12-a sealing valve seat, which is provided with a sealing ring,

2-the valve core is arranged on the valve body,

21-cutting the mixture into sections,

211-a hollow section of the hollow section,

2111-a first hollow section, a second hollow section,

21112 second hollow section

212-a section of variable diameter-such as,

2121-a via hole(s),

22-a plugging section, wherein the plugging section is provided with a plug,

3-shearing the ring by a shearing force,

4-the first chamber is provided with a first chamber,

41-the first section of the process,

42-the second section of the first section,

43-a third stage of the process,

5-the second chamber, and the second chamber,

6-the elastic piece is arranged on the upper surface of the shell,

7-the valve cap is arranged on the valve body,

71-through holes.

Detailed Description

Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

in a first aspect, embodiments of the present invention provide a unidirectional flow tool, as shown in fig. 1, comprising: the valve seat 1, the valve core 2 and the shearing ring 3; be provided with the first cavity 4 and the second cavity 5 that link together in the disk seat 1, first cavity 4 and oil pipe intercommunication, second cavity 5 and the annular intercommunication of oil jacket, and the internal diameter of second cavity 5 is less than the internal diameter of first cavity 4, and shear ring 3 is fixed in first cavity 4. The spool 2 includes: the shearing section 21 and the plugging section 22 are connected together, the free end of the shearing section 21 is connected with the shearing ring 3, the plugging section 22 is positioned in the second cavity 5, and the outer diameter of the plugging section 22 is matched with the inner diameter of the second cavity 5. After the shearing ring 3 is sheared, the valve core 2 moves axially, and the plugging section 22 moves into the first cavity 4, so that gas or foam discharging agent sequentially passes through the second cavity 5 and the first cavity 4 from the air of the oil sleeve ring and enters the oil pipe.

The working principle of the unidirectional flow tool provided by the embodiment of the invention is explained as follows:

During the application, the one-way flow instrument sets up on oil pipe, and first cavity 4 and oil pipe intercommunication, second cavity 5 and oil jacket annular intercommunication. Initially, the plugging section 22 is located in the second chamber 5, the outer diameter of the plugging section 22 is matched with the inner diameter of the second chamber 5, the plugging section 22 is in sealing contact with the second chamber 5 to enable the first chamber 4 and the second chamber 5 to be incapable of being communicated, so that the oil pipe is isolated from the oil sleeve annulus, and natural gas in a gas production process is prevented from leaking out of the sleeve in the process of being discharged to the ground surface through the oil pipe.

when gas lift or foam drainage water drainage gas production is needed, gas or foam drainage agent is injected into the oil sleeve ring, and the gas or foam drainage agent enters the second chamber 5 communicated with the oil sleeve ring. The pressure of the gas or foam displacement agent acts on the blocking section 22, tending to move the valve element 2 axially to the left (with reference to the direction shown in fig. 1). Valve core 2 is connected fixedly with shear ring 3, and along with the pressure of gas or bubble row agent constantly increases, when increasing to shear ring 3's shear stress, shear ring 3 is cut, and valve core 2 axial displacement, shutoff section 22 remove to first cavity 4 in, and gas or bubble row agent are in order through second cavity 5, first cavity 4 entering oil pipe in the air from the oil lantern ring, can carry out gas lift or bubble row drainage gas production.

Therefore, the unidirectional flow tool provided by the embodiment of the invention has the advantages that the valve core 2 is connected with the shearing ring 3 to enable the plugging section 22 to be in sealing contact with the second chamber 5, and the oil pipe is not communicated with the oil sleeve annulus at the initial stage of gas production. When gas lift or foam drainage water drainage gas production is needed, gas or foam drainage agent is injected through the oil sleeve annulus, so that the shearing ring 3 is sheared under the action of pressure, and the gas or the foam drainage agent can enter an oil pipe. The one-way flow tool provided by the embodiment of the invention realizes the communication between the oil sleeve annulus and the oil pipe, the integrity of the oil pipe cannot be damaged, and the shearing ring 3 can be sheared by injecting gas or foam exhausting agent to suppress pressure, so that the oil sleeve annulus is communicated with the oil pipe, the operation is simple, and the production efficiency is improved.

In an embodiment of the present invention, as shown in fig. 1, the cutting segment 21 may include: the variable-diameter section 212 is arranged between the hollow section 211 and the plugging section 22; the reducing section 212 is provided with a through hole 2121 communicated with the hollow section 211. With such an arrangement, after the axial movement of the valve core 2 moves the blocking section 22 into the first chamber 4, the gas or foam discharging agent can enter the first chamber 4 through the second chamber 5, and then enter the hollow section 211 through the through hole 2121 on the reducing section 212.

further, as shown in fig. 1, the hollow section 211 comprises a first hollow section 2111 and a second hollow section 2112, the outer diameter of the first hollow section 2111 is smaller than that of the second hollow section 2112, and the free end of the first hollow section 2111 is connected with the shear ring 3; an annular space is formed between the first hollow section 2111 and the first chamber 4, and an elastic member 6 is provided between the second hollow section 2112 and the shear ring 3 in the annular space.

Since the outer diameter of the first hollow section 2111 is smaller than the outer diameter of the second hollow section 2112, a step surface is formed between the first hollow section 2111 and the second hollow section 2112, and an annular space is formed between the first hollow section 2111 and the first chamber 4, which facilitates the arrangement of the elastic member 6. And through setting up elastic component 6, when injecting gas or bubble and arranging the agent, case 2 moves left under the pressure effect, and gas or bubble are arranged the agent and can get into in the oil pipe from the oil lantern ring sky. When gas or foam discharging agent is not injected, the valve core 2 can reset under the action of the elastic piece 6, so that the blocking section 22 blocks the second chamber 5, and the oil pipe is not communicated with the oil sleeve annulus.

the elastic member 6 may be a spring connected between the second hollow section 2112 and the shear ring 3.

The first chamber 4 comprises a first section 41, a second section 42 and a third section 43 which are formed in sequence and have sequentially increased inner diameters, the first section 41 is communicated with the oil pipe, and the inner diameter of the second chamber 5 is smaller than that of the third section 43; the outer diameter of the first hollow section 2111 is matched with the inner diameter of the second section 42, and the outer diameter of the second hollow section 2112 is matched with the inner diameter of the third section 43; the shear ring 3 is arranged between the second section 42 and the third section 43.

According to the arrangement, after the shearing ring 3 is sheared, the first hollow section 2111 enters the second section 42, the second hollow section 2112 moves in the third section 43, the outer diameter of the first hollow section 211 is matched with the inner diameter of the second section 42, the outer diameter of the second hollow section 211 is matched with the inner diameter of the third section 43, and the valve core 2 is prevented from shaking in the valve seat 1. At this time, the gas or the foam discharging agent flows from the oil jacket to the second chamber 5, the third section 43, the through hole 2121, the second hollow section 2112, the first hollow section 2111, the second section 42 and the first section 41 in sequence and enters the oil pipe.

As shown in FIG. 1, the one-way flow tool provided by the present embodiment further includes a bonnet 7; the bonnet 7 is provided at one end of the valve seat 1, and a through hole 71 is provided in the bonnet 7 to communicate the second chamber 5 with the outside. One end of the second cavity 5 on the valve seat 1 is provided with the valve cap 7, the through hole 71 is formed in the valve cap 7, under the premise that gas or foam discharging agent is not influenced to enter the second cavity 5, sundries are prevented from entering the second cavity 5 to block the second cavity 5, and the one-way flow tool is ensured to be in a normal working state in an underground environment.

as shown in fig. 1, in order to facilitate the installation of the valve element 2 in the valve seat 1, the valve seat 1 includes: a shear valve seat 11 and a seal valve seat 12 connected together; the first chamber 4 is arranged in the shear valve seat 11 and the second chamber 5 is arranged in the sealing valve seat 12. So set up, set up the case 2 in shearing disk seat 11 earlier, then suit sealing valve seat 12, can accomplish the assembly forming of unidirectional flow instrument.

Wherein the shear valve seat 11 and the sealing valve seat 12 can be connected together by means of a screw connection.

In order to connect the unidirectional flow tool on an oil pipe conveniently, one end of the valve seat 1 is a screw thread end, and the valve seat 1 is fixed on the side wall of the oil pipe through the screw thread end and the oil pipe in threaded connection.

in a second aspect, embodiments of the present invention provide a tubing comprising any of the above one-way flow tools.

The oil pipe is not communicated with the oil sleeve annulus at the initial stage of gas production by arranging the one-way flow tool on the oil pipe. When gas lift or foam drainage water drainage gas production needs to be carried out, gas or foam drainage agent is injected through the oil sleeve annulus, and the foam drainage agent can enter the oil pipe through a one-way flow tool, so that the oil sleeve annulus is communicated with the oil pipe, the operation is simple, and the production efficiency is improved.

in order to facilitate the unidirectional flow tool to be connected to the oil pipe, the oil pipe comprises a gas lift working barrel, and the unidirectional flow tool is arranged on the side wall of the gas lift working barrel. The unidirectional flow tool is connected with the gas lift working barrel, and when gas lift or bubble drainage water drainage gas production is carried out, gas or bubble drainage agent enters the gas lift working barrel through the unidirectional flow tool and then flows to other positions in the oil pipe.

the above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.