Drainage gas recovery suction tool

Abstract

The utility model discloses a drainage gas production suction tool. One end of an upper suspender is fixedly connected with one end of a lower suspender; the annular pipe of a tubular structure is arranged on the periphery of the upper hanging rod and connected with the peripheral face of the upper hanging rod in a sliding mode. A plurality of through holes for water flow are formed in the contact position of the annular pipe and the upper hanging rod in the axial length direction of the annular pipe. In the process that a worker lowers the drainage gas production suction tool in a cable laying pipe cavity, liquid at the bottom of the cable laying pipe can flow through the inner wall of the annular pipe, and the flowing liquid can effectively reduce friction loss of the annular pipe and the outer wall of the cable laying pipe; in the process that the drainage and gas production suction tool is lifted and sucked in a cable laying pipe pipe cavity, the annular pipe generates negative pressure under the resistance effect of lifting water flow, the bottom end face of the annular pipe is attached to the end face of the end, close to the upper suspender, of the lower suspender, so that a water flow channel of the annular pipe and the upper suspender is closed, the loss amount of liquid is reduced, and the good drainage effect is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas field development and production equipment, and particularly relates to a drainage gas production suction tool. Background Art

[0002] The main challenge currently faced in the trial production of natural gas wells lies in how to effectively remove the liquid in the wellbore to resume normal production. The traditional method is to use high-pressure-resistant metal oil pipes in combination with nitrogen gas lift for drainage gas production, but the emerging cable-laid pipe drainage gas production process faces challenges due to its specific performance limitations.

[0003] The summary of key points is as follows:

[0004] Traditional method: The metal oil pipe and nitrogen gas lift method are adopted. Since the metal oil pipe has high internal and external pressure resistance capabilities, it is suitable for nitrogen gas lift operations.

[0005] Challenges of emerging processes:

[0006] Characteristics of cable-laid pipes: High internal pressure resistance (>90 MPa), meeting the requirements of gas lift; but limited external pressure resistance (about 20 MPa);

[0007] Well depth and pressure problems: At a well depth of 2000 - 3000 meters, the bottom hole pressure difference generated by nitrogen gas lift may exceed the external pressure bearing capacity of the cable-laid pipe, resulting in crushing.

[0008] Problems with the suction process: There is a lack of a supporting suction tool suitable for cable-laid pipes, and existing tools are prone to wear the inner wall of the cable-laid pipe, affecting its performance and service life.

[0009] In summary, how to effectively remove the liquid in the wellbore while maintaining the integrity of the cable-laid pipe has become an urgent problem to be solved in the current trial production of natural gas wells. Utility Model Content

[0010] Embodiments of this application provide a drainage gas production suction tool, aiming to ensure good drainage operations in gas wells or oil wells while ensuring the structural integrity of the device.

[0011] To achieve the above object, this application provides the following technical solutions:

[0012] A drainage gas production suction tool includes an upper suspension rod, a lower suspension rod, and an annular pipe;

[0013] One end of the upper suspension rod is fixedly connected to one end of the lower suspension rod;

[0014] The annular pipe with a tubular structure is arranged on the circumference of the upper suspension rod and is slidably connected to the circumferential surface of the upper suspension rod;

[0015] Multiple through holes for water flow are uniformly arranged along the axial length of the circumferential surface at the contact position between the annular pipe and the upper suspension rod.

[0016] Further, the head end of the upper suspension rod is flat, and a connection hole for connecting with an external lowering mechanism is vertically penetrated through the middle thereof.

[0017] Further, a protrusion extends along the radial direction in the middle of the upper suspension rod, and the top of the protrusion is higher than or flush with the top of the through hole.

[0018] Further, a light hole for the upper suspension rod to pass through is circumferentially formed in the middle of the ring pipe, the inside of the light hole is slidably connected with the peripheral surface of the tail of the upper suspension rod, and the edge of the light hole communicates with the cavity of the through hole.

[0019] Further, a plurality of diversion grooves are uniformly arranged on the circumference of the lower suspension rod along the axial length direction from its end face, and the bottoms of the plurality of diversion grooves and the tops of the corresponding through holes are arranged at different heights in the vertical plane.

[0020] Further, a counterweight hole for installing a counterweight is formed at the bottom of the lower suspension rod.

[0021] Further, a plurality of annular grooves are concavely formed on the peripheral surface of the ring pipe, and the plurality of annular grooves are uniformly arranged along the pipe length direction of the ring pipe.

[0022] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects:

[0023] In the present application, when the staff lowers the drainage gas production suction tool in the inner cavity of the cable laying pipe, the liquid at the bottom of the cable laying pipe can flow through the inner wall of the ring pipe, and the flowing liquid can effectively reduce the frictional loss between the ring pipe and the outer wall of the cable laying pipe; when the drainage gas production suction tool is lifted and sucked in the inner cavity of the cable laying pipe, a negative pressure is generated on the ring pipe under the action of the resistance of the upward flowing water, so that the bottom end face of the ring pipe fits with the end face of the lower suspension rod close to the upper suspension rod to close the water flow channel between the ring pipe and the upper suspension rod, thereby reducing the liquid loss amount to ensure a good drainage effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for describing the embodiments of the present utility model or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the drainage gas production suction tool provided in the embodiments of the present application;

[0026] Figure 2It is a schematic structural diagram of the drainage gas production suction tool provided by the embodiment of the present application in a sectional view state;

[0027] Figure 3 It is a schematic structural diagram of the annular pipe provided by the embodiment of the present application in a sectional view state;

[0028] Figure 4 It is a schematic structural diagram of the end face of the annular pipe provided by the embodiment of the present application;

[0029] Figure 5 It is a schematic structural diagram of the lower suspension rod provided by the embodiment of the present application.

[0030] Icon: 10 - upper suspension rod; 101 - connection hole; 11 - protrusion; 20 - annular pipe; 21 - through hole; 22 - light hole; 23 - annular groove; 30 - lower suspension rod; 31 - diversion groove; 32 - counterweight hole. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. The terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific situations.

[0033] Such as Figures 1 - 5As shown in the figure, a drainage and gas production suction tool includes an upper suspension rod 10, a lower suspension rod 30, and an annular pipe 20. One end of the upper suspension rod 10 is fixedly connected to one end of the lower suspension rod 30. The annular pipe 20 with a tubular structure is arranged on the periphery of the upper suspension rod 10 and is slidably connected to the peripheral surface of the upper suspension rod 10. Multiple through holes 21 for water flow are evenly arranged on the peripheral surface of the contact part between the annular pipe 20 and the upper suspension rod 10 along the axial length direction thereof.

[0034] The drainage and gas production suction tool in this application is mainly applied to the drainage and gas production operation in the lumen of the cable-laying pipe in gas wells and oil wells. The drainage and gas production suction tool in this application is composed of an upper suspension rod 10, a lower suspension rod 30, and an annular pipe 20. Among them, the upper suspension rod 10 and the lower suspension rod 30 are fixed by means of threaded connection, and they can also be fixed by means of pin connection. When the staff lowers the drainage and gas production suction tool in the lumen of the cable-laying pipe, the liquid at the bottom of the cable-laying pipe can flow through the inner wall of the annular pipe 20, and the flowing liquid can effectively reduce the frictional loss between the annular pipe 20 and the outer wall of the cable-laying pipe. When the drainage and gas production suction tool is lifted and sucked in the lumen of the cable-laying pipe, a negative pressure is generated under the action of the resistance of the upward flowing water on the annular pipe 20, so that the bottom end surface of the annular pipe 20 fits with the end surface of the lower suspension rod 30 close to the upper suspension rod 10 to close the water flow channel between the annular pipe 20 and the upper suspension rod 10, thereby reducing the liquid loss and ensuring a good drainage effect.

[0035] As Figure 4 shown in the figure, to facilitate the lowering and lifting actions of the drainage and gas production suction tool in this application, the head end of the upper suspension rod 10 is flat, and a connection hole 101 for connecting with an external driving mechanism is vertically penetrated through the middle thereof. The connection hole 101 is arranged at the flat surface of the upper suspension rod 10, which is convenient for the staff to fixedly connect the external driving mechanism to the upper suspension rod 10, and at the same time avoids the head end of the upper suspension rod 10 from knocking against the pipe wall of the cable-laying pipe. Preferably, those skilled in the art can use a high-strength nylon rope or cable to pass through the connection hole 101 to bind the upper suspension rod 10.

[0036] A protrusion 11 extends along the radial direction in the middle of the upper suspension rod 10, and the top of the protrusion 11 is higher than or flush with the top of the through hole 21. The purpose of such a setting is that during the lowering or lifting of the upper suspension rod 10, the end surface of the annular pipe 20 contacts or separates from the end surface of the protrusion 11 close to the lower suspension rod 30 to realize the passage or blockage of the liquid in the annular pipe 20.

[0037] As Figure 3 shown in the figure, a light hole 22 for the upper suspension rod 10 to pass through is circumferentially opened in the middle of the annular pipe 20. The inside of the light hole 22 is slidably connected to the peripheral surface of the tail of the upper suspension rod 10, and the hole edge of the light hole 22 is communicated with the hole cavity of the through hole 21.

[0038] In the above solution, the arrangement of the light holes 22 in the annular pipe 20 can effectively reduce the frictional loss between the inner wall of the annular pipe 20 and the peripheral surface of the upper suspension rod 10. The communication between the light holes 22 and the through holes 21 is arranged in this way. On the one hand, it can ensure that the liquid in the cable laying pipe can flow normally during the sliding process of the annular pipe 20 and the upper suspension rod 10. On the other hand, it can avoid the deformation and jamming of the annular pipe 20 caused by the gushing of bottom-hole gas flow during the upward lifting process of the drainage and gas production suction tool, so as to ensure the good safety and feasibility of the drainage and gas production suction tool in this application.

[0039] As Figure 2 shown, it should be noted that during the lowering process of the drainage and gas production suction tool, there is a gap between the peripheral surface of the drainage and gas production suction tool in this application and the pipe wall of the cable laying pipe. A plurality of guide grooves 31 are provided on the periphery of the lower suspension rod 30 along the axial length direction from its end face. The bottoms of the plurality of guide grooves 31 and the tops of the corresponding through holes 21 are arranged in a vertically staggered manner in the vertical plane. The arrangement of the guide grooves 31 can improve the flow rate of the liquid in the cable laying pipe in the drainage and gas production suction tool, so as to ensure stable and efficient flow-through during the lowering process of the drainage and gas production suction tool.

[0040] A counterweight hole 32 for installing a counterweight is provided at the bottom of the lower suspension rod 30. The setting of the counterweight hole facilitates the fixed installation of an external counterweight rod at the bottom of the lower suspension rod 30, thereby increasing the overall weight of the drainage and gas production suction tool in this application, accelerating the lowering speed of the drainage and gas production suction tool, and at the same time ensuring that the drainage and gas production suction tool will not rub against the pipe wall of the cable laying pipe due to the offset caused by the resistance of the liquid during lowering, thereby ensuring the structural stability of the cable laying pipe.

[0041] To facilitate the formation of turbulence when the liquid flows through the gap with the annular pipe 20, a plurality of annular grooves 23 are concavely provided on the peripheral surface of the annular pipe 20. The plurality of annular grooves 23 are uniformly arranged along the pipe length direction of the annular pipe 20. The turbulence formed by the plurality of annular grooves 23 can effectively reduce the leakage amount.

[0042] The annular pipe 20 in this application is made of nylon material. The purpose of this setting is that the density of the nylon material is 1.15 g / cm 3 , which is close to the density of water. During the lowering process, the liquid will have a certain thrust on the annular pipe 20, driving the annular pipe 20 to move upward on the periphery of the upper suspension rod 10. During this process, a through hole in the annular pipe 20 and the through hole 21 will form an inner channel, where the inner channel includes a gap channel between the annular pipe 20 and the upper suspension rod 10 and the hole channel of the through hole 21 for the liquid to flow through. The material of the annular pipe in this application can also be resin, high borosilicate and other materials.

[0043] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A drainage and gas extraction suction tool, characterized in that: It comprises an upper suspension rod (10), a lower suspension rod (30), and a ring tube (20); The tail end of the upper suspension rod (10) is fixedly connected to the head end of the lower suspension rod (30); The annular tube (20) of the tubular structure is arranged on the periphery of the upper suspension rod (10) and is slidably connected to the periphery of the upper suspension rod (10); The peripheral surface of the contact point between the annular tube (20) and the upper suspension rod (10) is evenly provided with a plurality of through holes (21) for water flow along the axial length direction.

2. The drainage and gas extraction suction tool according to claim 1, characterized in that: The head end of the upper suspension rod (10) is flat, and a connection hole (101) is passed through the middle thereof from top to bottom for connection with an external lowering mechanism.

3. The drainage and gas extraction suction tool according to claim 2, characterized in that: A protrusion (11) extends from the middle of the upper suspension rod (10) along its radial direction, and the top of the protrusion (11) is higher than or flush with the top of the through hole (21).

4. The drainage and gas extraction suction tool according to claim 1, characterized in that: A light hole (22) for the upper suspension rod (10) to pass through is opened in the middle of the ring tube (20) in the circumferential direction, the interior of the light hole (22) is slidably connected to the circumferential surface of the tail of the upper suspension rod (10), and the edge of the light hole (22) is connected to the cavity of the through hole (21).

5. The drainage and gas extraction suction tool according to claim 1, characterized in that: The circumference of the lower suspension rod (30) is provided with a plurality of guide grooves (31) from its end surface along its axial length direction, and the groove bottoms of the plurality of guide grooves (31) and the hole tops of the corresponding through holes (21) are arranged in a vertical plane with a height offset.

6. The drainage and gas extraction suction tool according to claim 5, characterized in that: A counterweight hole (32) for installing a counterweight is provided at the bottom of the lower suspension rod (30).

7. The drainage and gas extraction suction tool according to claim 4, characterized in that: The peripheral surface of the annular tube (20) is concavely provided with a plurality of annular grooves (23), and the plurality of annular grooves (23) are evenly arranged along the tube length direction of the annular tube (20).

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