Integrated drainage tool for coiled tubing

Abstract

The present invention belongs to the technical field of downhole operation of oil and gas wells, and in particular, relates to an integrated drainage tool for continuous oil pipes, which aims to reduce labor intensity and shorten the construction period. The present invention includes a hydraulic pump assembly and a rubber cylinder assembly connected to the bottom of the hydraulic pump assembly; the hydraulic pump assembly includes a pump barrel, and a longitudinally extending upper liquid channel, a longitudinally extending power liquid channel, and a transversely extending drainage channel connected to the power liquid channel are arranged in the pump barrel; a negative pressure zone is arranged in the middle section of the power liquid channel, and the outlet of the upper liquid channel is connected to the negative pressure zone; an inner channel is arranged in the rubber cylinder assembly, and the inner channel is connected to the upper liquid channel; the rubber cylinder assembly is configured to form a cross-section that cuts off the annulus between the pump barrel and the pipe wall. The present invention generates negative pressure in the negative pressure zone by injecting power liquid into the power liquid channel, and pumps the formation fluid into the power liquid channel through the inner channel and the upper liquid channel, and the formation fluid is carried by the power liquid and discharged from the drainage channel, and returns to the ground under the obstruction of the cross-section.

Description

Technical Field

[0001] The invention relates to the technical field of downhole operation of oil and gas wells, and in particular to an integrated liquid drainage tool for continuous oil pipes. Background Art

[0002] Hydraulic pump drainage is a common drainage method used in the process of well testing and completion. Conventional hydraulic pump drainage construction is to use tubing to lower the pump barrel and packer of the hydraulic pump to the predetermined position. After the packer is seated, the pump core of the hydraulic pump is put into the pump barrel by tubing, and the pump core is seated in the pump barrel to start the hydraulic pump drainage construction. This method has more construction procedures and needs to put in the pump core of the hydraulic pump separately. Therefore, this hydraulic pump can only be sent to the well by tubing. The lifting and lowering of tubing is not only labor-intensive and has a long construction period, but also has the risk that the pump core cannot be seated. Summary of the invention

[0003] The object of the present invention is to provide an integrated drainage tool for coiled tubing, so as to reduce the labor intensity and operation difficulty of drainage construction and shorten the construction period.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A fluid discharge integrated tool for a coiled tubing, comprising a hydraulic pump assembly and a rubber cartridge assembly connected to the lower portion of the hydraulic pump assembly; the hydraulic pump assembly comprises a pump cartridge, in which a longitudinally extending upper fluid channel, a longitudinally extending power fluid channel, and a transversely extending fluid discharge channel connected to the power fluid channel are arranged; a negative pressure zone is arranged in the middle section of the power fluid channel, and an outlet of the upper fluid channel is connected to the negative pressure zone;

[0006] An inner channel is arranged in the rubber cartridge assembly, and the inner channel is communicated with the upper liquid channel; the rubber cartridge assembly is configured to form a truncated surface that cuts off the annular space between the pump barrel and the pipe wall.

[0007] Furthermore, the power fluid channel includes an injection channel and a diffusion channel arranged below the injection channel; the outlet of the injection channel and the inlet of the diffusion channel are opposite to each other and are both connected to the negative pressure area; the outlet of the injection channel extends into the diffusion channel, and the inner diameter of the diffusion channel gradually increases from the inlet of the diffusion channel to the outlet of the diffusion channel.

[0008] Furthermore, the hydraulic pump assembly includes a guide head, a nozzle connected to the bottom of the guide head, and a nozzle sleeve sleeved outside the nozzle, and the inner hole of the guide head and the inner hole of the nozzle form a jet channel.

[0009] Furthermore, the hydraulic pump assembly also includes a throat, a diffuser A tube, and a diffuser B tube; the throat is arranged below the nozzle and is provided with an expansion hole facing the nozzle; the diffuser A tube is arranged below the throat, and the diffuser B tube is arranged below the diffuser A tube; the inner holes of the throat, the diffuser A tube, and the diffuser B tube are continuous to form a diffusion channel.

[0010] Furthermore, the hydraulic pump assembly also includes a fixing sleeve, which is sleeved on the throat pipe, and the area surrounded by the nozzle sleeve, the nozzle, the throat pipe and the fixing sleeve forms a negative pressure area.

[0011] Furthermore, the hydraulic pump assembly also includes a wall-attached cylinder, which is inserted into the pump barrel and sleeved on the fixed sleeve, diffusion tube A and diffusion tube B; an annular space is formed between the wall-attached cylinder and the fixed sleeve, diffusion tube A and diffusion tube B, and the annular space is the upper liquid channel.

[0012] Furthermore, the hydraulic pump assembly also includes a flow channel converter arranged below the diffuser B tube, and the flow channel converter is provided with a flow hole and an inner flow channel that are isolated from each other; the flow hole is connected to the upper liquid channel, and the inner flow channel is connected to the power liquid channel.

[0013] Furthermore, a first liquid discharge port is provided at the lower part of the pump barrel, a second liquid discharge port is provided at the lower part of the wall barrel, and a third liquid discharge port is provided at the flow channel converter, and the third liquid discharge port is connected to the internal flow channel; the first liquid discharge port, the second liquid discharge port and the third liquid discharge port have the same shape and are aligned with each other to form a liquid discharge channel.

[0014] Furthermore, the rubber cylinder assembly includes a rubber cylinder and a pressure balance channel arranged along the axial direction of the rubber cylinder; the rubber cylinder protrudes toward the tube wall to form a cross-section after being subjected to a vertical downward extrusion force; and two openings of the pressure balance channel are respectively located above and below the rubber cylinder.

[0015] Furthermore, the pressure balance channel has an open state and a closed state. During the drainage process, the pressure balance channel is in a closed state; during the removal of the integrated drainage tool, the pressure balance channel is in an open state.

[0016] Furthermore, the integrated drainage tool for the continuous oil pipe also includes a slip righting assembly arranged below the rubber sleeve assembly, the slip righting assembly includes a slip and a righting block arranged below the slip, and the slip righting assembly is provided with a connecting channel, which is connected to the inner channel.

[0017] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0018] The integrated fluid discharge tool for a continuous oil pipe provided by the present invention comprises a hydraulic pump assembly and a rubber cartridge assembly connected to the lower part of the hydraulic pump assembly; the hydraulic pump assembly comprises a pump cartridge, in which a longitudinally extending upper liquid channel, a longitudinally extending power liquid channel and a transversely extending fluid discharge channel connected to the power liquid channel are arranged; a negative pressure zone is arranged in the middle section of the power liquid channel, and an outlet of the upper liquid channel is connected to the negative pressure zone; an inner channel is arranged in the rubber cartridge assembly, and the inner channel is connected to the upper liquid channel; the rubber cartridge assembly is configured to form a cross-sectional surface that cuts off the annulus between the pump cartridge and the pipe wall.

[0019] Since the integrated drainage tool for the continuous tubing provided by the present invention is put into the well as a whole through the continuous tubing, negative pressure is generated in the negative pressure area after the power fluid is injected into the power fluid channel, and the formation fluid is sucked into the power fluid channel through the inner channel and the upper liquid channel by the suction effect of the negative pressure, so that the power fluid and the formation fluid are mixed, and the power fluid and the formation fluid are discharged through the drainage channel. At the same time, the cross-section formed by the rubber cylinder assembly and the pipe wall prevents the discharged power fluid and formation fluid from flowing back downward, ensuring that the discharged power fluid and formation fluid are discharged from the drainage channel and return to the ground through the annulus between the continuous tubing and the pipe wall, completing the drainage process. Thereby avoiding the operation processes such as assembling the tubing, assembling the packer, and inserting the pump core, reducing the labor intensity and operation difficulty of the drainage construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the integrated drainage tool for coiled tubing provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the setting state of the integrated drainage tool for the coiled tubing provided by the present invention;

[0023] Figure 3 It is a structural schematic diagram of a hydraulic pump assembly 1 of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the rubber cartridge assembly 2 of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the slip righting assembly 3 of the present invention;

[0026] Figure 6 It is a schematic structural diagram of a pump barrel 1-1 of the present invention;

[0027] Figure 7 It is a schematic structural diagram of the wall-attached tube 1-2 of the present invention;

[0028] Figure 8 It is a schematic structural diagram of the guide head 1-3 of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of the nozzle sleeve 1-4 of the present invention;

[0030] Fig.10 is a cross-sectional view of a nozzle 1-5 of the present invention;

[0031] Fig.11 is a schematic diagram of a nozzle 1-5 of the present invention;

[0032] Fig.12 is a cross-sectional view of the fixing sleeve 1-6 of the present invention;

[0033] Fig.13 is a schematic diagram of a fixing sleeve 1-6 of the present invention;

[0034] Fig.14 is a cross-sectional view of the throat 1-7 of the present invention;

[0035] Fig.15 is a cross-sectional view of the flow channel converter 1-10 of the present invention;

[0036] Fig.16 is a schematic structural diagram of a flow channel converter 1-10 of the present invention;

[0037] Fig.17 It is a schematic structural diagram of the inner cylinder 2-1 of the present invention;

[0038] Fig.18 is a cross-sectional view of the top tube 2-2 of the present invention;

[0039] Fig.19 It is a schematic structural diagram of the top tube 2-2 of the present invention;

[0040] Fig. 20 It is a schematic diagram of the structure of the slide 2-3 of the present invention;

[0041] Fig.21 It is a schematic diagram of the structure of the fixed cylinder 2-6 of the present invention;

[0042] Fig. 22 It is a schematic structural diagram of the bottom cone slide 2-10 of the present invention;

[0043] Fig.23 It is a schematic structural diagram of the central tube 3-1 of the present invention;

[0044] Fig.24 It is a schematic diagram of the structure of the slip 3-2 of the present invention;

[0045] Fig.25 It is a structural schematic diagram of the righting block 3-4 of the present invention;

[0046] Fig.26 It is a schematic diagram of the structure of the sliding cylinder 3-6 of the present invention;

[0047] Fig. 27 It is a schematic structural diagram of the guide tube 3-10 of the present invention.

[0048] Icons: a, upper liquid channel; b, power liquid channel; b-1, injection channel; b-2, diffusion channel; c, drainage channel; d, negative pressure area; e, inner channel; f, pressure balance channel; g, connecting channel; 1, hydraulic pump assembly; 1-1, pump barrel; 1-1-1, first drainage port; 1-1-2, first step; 1-2, wall-attached barrel; 1-2-1, second drainage port; 1-2-2, second step; 1-3, guide head; 1-3-1, third step; 1 -3-2, fourth step; 1-4, nozzle sleeve; 1-4-1, fifth step; 1-4-2, sixth step; 1-4-3, seventh step; 1-5, nozzle; 1-5-1, extension; 1-5-2, eighth step; 1-6, fixed sleeve; 1-6-1, ninth step; 1-6-2, inclined hole; 1-7, throat; 1-7-1, tenth step; 1-8, diffuser A tube; 1-9, diffuser B tube; 1-10, flow channel converter; 1-10-1 , flow hole; 1-10-2, third drain port; 1-10-3, inner flow channel; 1-11, support plug; 2, rubber cylinder assembly; 2-1, inner cylinder; 2-2, top cylinder; 2-2-1, annular boss; 2-2-2, eleventh step; 2-2-3, twelfth step; 2-3, sliding cylinder; 2-4, sealing gasket; 2-5, sleeve; 2-6, fixed cylinder; 2-6-1 thirteenth step; 2-6-2 annular groove; 2-6-3, fourteenth step; 2-6 -4, the fifteenth step; 2-6-5, the annular step groove; 2-7, the rubber cylinder; 2-8, the support cylinder; 2-9, the fixed plug; 2-10, the bottom cone slide cylinder; 3, the slip straightening assembly; 3-1, the center tube; 3-1-1, the short track; 3-1-2, the long track; 3-2, the slip; 3-3, the pressure block; 3-4, the straightening block; 3-5, the spring; 3-6, the sliding cylinder; 3-7, the slider; 3-8, the limit pin; 3-9, the pin; 3-10, the guide cylinder. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0053] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only 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.

[0054] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0056] Hydraulic pump drainage is a common drainage method used in the process of well testing and completion. Conventional hydraulic pump drainage construction is to use tubing to lower the pump barrel and packer of the hydraulic pump to the predetermined position. After the packer is seated, the pump core of the hydraulic pump is put into the pump barrel by tubing, and the pump core is seated in the pump barrel to start the hydraulic pump drainage construction. This method has more construction procedures and needs to put in the pump core of the hydraulic pump separately. Therefore, this hydraulic pump can only be sent to the well by tubing. The lifting and lowering of tubing is not only labor-intensive and has a long construction period, but also has the risk that the pump core cannot be seated.

[0057] In view of this, the present invention provides an integrated drainage tool for a continuous oil pipe, comprising a hydraulic pump assembly 1 and a rubber cartridge assembly 2 connected to the bottom of the hydraulic pump assembly 1; the hydraulic pump assembly 1 comprises a pump barrel 1-1, and the pump barrel 1-1 is provided with a longitudinally extending upper liquid channel a, a longitudinally extending power liquid channel b and a transversely extending drainage channel c connected to the power liquid channel b; a negative pressure zone d is provided in the middle section of the power liquid channel b, and the outlet of the upper liquid channel a is connected to the negative pressure zone d; an inner channel e is provided in the rubber cartridge assembly 2, and the inner channel e is connected to the upper liquid channel a; the rubber cartridge assembly 2 is configured to form a cross-sectional surface that cuts off the annulus between the pump barrel 1-1 and the pipe wall.

[0058] Since the integrated drainage tool for the continuous tubing provided by the present invention is put into the well as a whole through the continuous tubing, after the power fluid is injected into the power fluid channel b, negative pressure is generated in the negative pressure area d, and the formation fluid is sucked into the power fluid channel b through the inner channel e and the upper liquid channel a by the suction effect of the negative pressure, so that the power fluid and the formation fluid are mixed, and the power fluid and the formation fluid are discharged through the drainage channel c. At the same time, the cross-section formed by the rubber cylinder assembly 2 and the pipe wall prevents the discharged power fluid and formation fluid from flowing back downward, ensuring that the discharged power fluid and formation fluid are discharged from the drainage channel c and return to the ground through the annulus between the continuous tubing and the pipe wall, completing the drainage process. Thereby avoiding the operation processes such as assembling the tubing, assembling the packer, and inserting the pump core, reducing the labor intensity and operation difficulty of the drainage construction.

[0059] The structure and shape of the hydraulic pump assembly 1 are described in detail below:

[0060] The hydraulic pump assembly 1 includes a pump barrel 1-1, such as Figure 3 , 6 As shown, the pump barrel 1-1 is a hollow cylinder with an internal thread on the upper portion, which is connected to the continuous oil pipe.

[0061] Furthermore, the hydraulic pump assembly 1 also includes a wall-attached cylinder 1-2, such as Figure 3 , 7 As shown, the wall-attached cylinder 1-2 is inserted into the pump cylinder 1-1. A first step 1-1-2 is provided below the internal thread of the upper part of the pump cylinder 1-1, and the upper end of the wall-attached cylinder 1-2 abuts against the first step 1-1-2.

[0062] Furthermore, sealing grooves are opened on the outer circles of both sides of the wall-attached cylinder 1-2, and sealing rings are arranged in the sealing grooves to improve the sealing performance between the wall-attached cylinder 1-2 and the pump cylinder 1-1.

[0063] Furthermore, the hydraulic pump assembly 1 also includes a guide head 1-3, such as Figure 3 , 7As shown in Figures 8 and 9, the guide head 1-3 is inserted into the wall-coated tube 1-2 and is located at the upper part of the wall-coated tube 1-2. A second step 1-2-2 is provided at the upper part of the wall-coated tube 1-2, and a third step 1-3-1 is provided at the upper part of the guide head 1-3. The second step 1-2-2 abuts against the third step 1-3-1 to limit the position of the guide head 1-3.

[0064] Furthermore, the hydraulic pump assembly 1 also includes a nozzle sleeve 1-4 sleeved on the lower part of the guide head 1-3 and a nozzle 1-5 connected to the lower end surface of the guide head 1-3. As shown in Figures 3, 8, 9, 10, and 11, a fourth step 1-3-2 is provided at the lower part of the guide head 1-3, and a fifth step 1-4-1 is provided in the inner hole of the nozzle sleeve 1-4, and the fifth step 1-4-1 abuts against the fourth step 1-3-2. A sixth step 1-4-2 is provided below the fifth step 1-4-1 of the nozzle sleeve 1-4, and an eighth step 1-5-2 is provided on the nozzle 1-5, and the eighth step 1-5-2 abuts against the sixth step 1-4-2, so that the nozzle sleeve 1-4 and the guide head 1-3 fix the nozzle 1-5.

[0065] Furthermore, a conical hole is opened on the upper part of the guide head 1-3, and the lower part of the conical hole is connected to the straight hole; a conical hole is opened on the upper part of the nozzle 1-5, and the lower end is connected to the straight hole; the inner holes of the guide head 1-3 and the nozzle 1-5 are connected to form an injection channel b-1.

[0066] Furthermore, the nozzle 1-5 and the nozzle sleeve 1-4 are bonded with glue.

[0067] Furthermore, the nozzles 1-5 are made of cemented carbide.

[0068] Furthermore, a sealing ring is provided at the connection between the lower end surface of the guide head 1-3 and the upper end surface of the nozzle 1-5, and a sealing ring is provided at the nozzle sleeve 1-4 which is sleeved on the guide head 1-3 to improve the sealing ability of the connection.

[0069] Further, the nozzle sleeve 1-4 is inserted into the wall-attached tube 1-2, and a sealing ring is arranged between the nozzle sleeve 1-4 and the wall-attached tube 1-2 to ensure the sealing between the wall-attached tube 1-2 and the nozzle sleeve 1-4.

[0070] Furthermore, the hydraulic pump assembly 1 also includes a fixing sleeve 1-6 disposed below the nozzle sleeve 1-4, such as Figure 3 , 9 As shown in FIGS. 12 and 13, a seventh step 1-4-3 is provided at the lower portion of the nozzle sleeve 1-4, and the upper end surface of the fixed sleeve 1-6 abuts against the seventh step 1-4-3.

[0071] Furthermore, the hydraulic pump assembly 1 also includes a throat 1-7 inserted into the fixing sleeve 1-6, such as Figure 3 , 12As shown in FIGS. 13 and 14, a ninth step 1-6-1 is provided on the upper part of the fixed sleeve 1-6, and a tenth step 1-7-1 is provided on the throat 1-7. The ninth step 1-6-1 abuts against the tenth step 1-7-1 to limit the position where the throat 1-7 is inserted into the fixed sleeve 1-6, so that the throat 1-7 maintains a certain distance from the nozzle 1-5.

[0072] Further, the throat 1-7 is made of cemented carbide.

[0073] Furthermore, the nozzle 1-5 is provided with an extension portion 1-5-1, and the extension portion 1-5-1 passes through the nozzle sleeve 1-4 and is inserted into the throat 1-7.

[0074] Furthermore, the extension portion 1-5-1 is conical, and the generatrix of the cone is concave to form a concave surface; the upper portion of the throat 1-7 is an arc surface; the lower end surface of the nozzle sleeve 1-4 that is not in contact with the fixed sleeve 1-6 is a concave surface; the concave surface of the extension portion 1-5-1, the arc surface of the upper portion of the throat 1-7, the concave surface of the lower end of the nozzle sleeve 1-4 and the inner hole of the fixed sleeve 1-6 constitute a negative pressure zone d.

[0075] Further, the outlet of the injection channel b-1 is communicated with the negative pressure area d.

[0076] Furthermore, the hydraulic pump assembly 1 also includes a diffuser A tube 1-8 disposed below the throat pipe 1-7 and a diffuser B tube 1-9 connected to the diffuser A tube 1-8 below. Figure 3 As shown, the diffuser A tube 1-8 is inserted into the fixed sleeve 1-6, and a step is provided on the upper part of the diffuser A tube 1-8. The step on the upper part of the diffuser A tube 1-8 abuts against the lower end surface of the fixed sleeve 1-6 to limit the depth of the diffuser A tube 1-8 inserted into the fixed sleeve 1-6. The upper end surface of the diffuser A tube 1-8 abuts against the lower end surface of the throat 1-7, so that the diffuser A tube 1-8 and the fixed sleeve 1-6 fix the throat 1-7. The diffuser B tube 1-9 is inserted into the diffuser A tube 1-8, and the lower end of the diffuser A tube 1-8 and the upper end of the diffuser B tube 1-9 are both provided with steps, and the two steps cooperate with each other to limit the distance of the diffuser B tube 1-9 inserted into the diffuser A tube 1-8 and fix the diffuser A tube 1-8.

[0077] Furthermore, a sealing ring is provided at the connection between the diffuser A tube 1-8 and the diffuser B tube 1-9 to ensure the sealing between the diffuser A tube 1-8 and the diffuser B tube 1-9.

[0078] Furthermore, the throat 1-7, the diffuser A tube 1-8 and the diffuser B tube 1-9 are all provided with inner holes, and the inner holes of the throat 1-7, the diffuser A tube 1-8 and the diffuser B tube 1-9 are connected in sequence to form a diffusion channel b-2, and the diameter of the diffusion channel b-2 gradually increases from top to bottom.

[0079] Furthermore, the inlet of the diffusion channel b-2 is connected to the negative pressure area d.

[0080] Furthermore, the injection channel b-1 and the diffusion channel b-2 constitute the power fluid channel b.

[0081] Furthermore, the hydraulic pump assembly 1 also includes a flow channel converter 1-10 disposed at the lower end of the diffuser B tube 1-9, such as Figure 3 , 15 As shown in FIG. 16 , the flow channel converter 1-10 is inserted into the diffuser B tube 1-9, and a step is provided at the lower portion of the diffuser B tube 1-9. The upper end surface of the flow channel converter 1-10 cooperates with the step at the lower portion of the diffuser B tube 1-9 to fix the diffuser B tube 1-9.

[0082] Furthermore, a sealing ring is provided at the connection between the diffuser B tube 1-9 and the flow channel converter 1-10 to ensure sealing.

[0083] Furthermore, the flow channel converter 1-10 includes a flow hole 1-10-1, a third liquid discharge port 1-10-2 and an inner flow channel 1-10-3, such as Figure 3 , 15 As shown in Figures 16, the inner flow channel 1-10-3 is connected to the third liquid discharge port 1-10-2, and the flow hole 1-10-1 is not connected to the third liquid discharge port 1-10-2 and the inner flow channel 1-10-3.

[0084] Further, such as Figure 3 , 6 As shown in , 7 and 15, the lower part of the pump barrel 1-1 is provided with a first liquid discharge port 1-1-1, and the lower part of the wall-attached barrel 1-2 is provided with a second liquid discharge port 1-2-1. The first liquid discharge port 1-1-1, the second liquid discharge port 1-2-1 and the third liquid discharge port 1-10-2 are of the same shape and aligned with each other to form a liquid discharge channel c. The liquid discharge channel c is connected to the power liquid channel b through the inner flow channel 1-10-3.

[0085] Further, the number of the first liquid discharge port 1-1-1, the second liquid discharge port 1-2-1 and the third liquid discharge port 1-10-2 is four.

[0086] Furthermore, the annular space between the wall-attached tube 1-2 and the fixed sleeve 1-6, the diffuser A tube 1-8 and the diffuser B tube 1-9 and the flow hole 1-10-1 form an upper liquid channel a.

[0087] Further, such as Figure 3 , 12 As shown in Figures 1 and 13, an inclined hole 1-6-2 is opened on the fixed sleeve 1-6, and the upper liquid channel a is connected with the negative pressure area d through the inclined hole 1-6-2.

[0088] Furthermore, the flow channel converter 1-10 is inserted into the wall-attached tube 1-2, and sealing rings are provided between the upper and lower sides of the flow channel converter 1-10 and the wall-attached tube 1-2 to ensure the sealing between the channels.

[0089] Furthermore, the hydraulic pump assembly 1 also includes a support plug 1-11 disposed below the flow channel converter 1-10, such as Figure 3 As shown, the support plug 1-11 is inserted into the lower part of the wall-attached tube 1-2 and is screwed with the wall-attached tube 1-2. The upper end surface of the support plug 1-11 abuts against the lower end surface of the flow channel converter 1-10, which is used to fix the flow channel converter 1-10 and the upper parts in the wall-attached tube 1-2.

[0090] The shape and structure of the rubber cartridge assembly 2 are described in detail below:

[0091] The rubber cylinder assembly 2 includes a top cylinder 2-2 inserted into the pump cylinder 1-1, as shown in FIG. Figure 4 , 18 As shown in Figures 19, the upper end surface of the top tube 2-2 abuts against the lower end surface of the support plug 1-11, and the top tube 2-2 is screwed to the lower part of the pump barrel 1-1. The outer circle of the top tube 2-2 is provided with an eleventh step 2-2-2, which abuts against the lower end surface of the pump barrel 1-1 to limit the position of the top tube 2-2 inserted into the pump barrel 1-1.

[0092] Furthermore, the rubber cylinder assembly 2 also includes an inner cylinder 2-1, such as Figure 4 , 17 As shown in FIG. 18 , the upper portion of the inner tube 2-1 is inserted into the top tube 2-2 and screwed with the top tube 2-2. The inner circle of the top tube 2-2 is provided with a twelfth step 2-2-3, and the upper end surface of the inner tube 2-1 abuts against the twelfth step 2-2-3, limiting the position of the inner tube 2-1 inserted into the top tube 2-2.

[0093] Furthermore, the inner hole of the inner cylinder 2-1 is an inner channel e, and the inner channel e is connected to the flow hole 1-10-1.

[0094] Furthermore, the rubber cylinder assembly 2 also includes a slide cylinder 2-3, such as Figure 4 , 20 As shown, the slide 2-3 is sleeved on the pump barrel 1-1 and the top barrel 2-2, and the slide 2-3 is slidably connected with the pump barrel 1-1 and the top barrel 2-2. A step is arranged on the upper part of the slide 2-3, which cooperates with the eleventh step 2-2-2 to limit the position where the slide 2-3 slides downward.

[0095] Furthermore, the rubber cylinder assembly 2 also includes a fixed cylinder 2-6, such as Figure 4 , 21 The upper part of the fixed cylinder 2-6 is inserted into the lower part of the slide cylinder 2-3 and screwed with the lower part of the slide cylinder 2-3. The outer side of the upper part of the fixed cylinder 2-6 is provided with a thirteenth step 2-6-1, which abuts against the lower end surface of the slide cylinder 2-3 to limit the relative position of the slide cylinder 2-3 and the fixed cylinder 2-6.

[0096] Furthermore, the rubber cartridge assembly 2 also includes a sleeve 2-5, such as Figure 4 , 21 As shown, the sleeve 2-5 is sleeved on the upper part of the inner cylinder 2-1 and inserted into the upper part of the fixed cylinder 2-6. The inner side of the fixed cylinder 2-6 is provided with a fifteenth step 2-6-4, and the lower end of the sleeve 2-5 abuts against the fifteenth step 2-6-4. The outer circle of the sleeve 2-5 is provided with a thread and is screwed with the fixed cylinder 2-6.

[0097] Furthermore, the upper part of the sleeve 2-5 is provided with a step, and the inner side of the fixed cylinder 2-6 is provided with an annular groove 2-6-2 and a fourteenth step 2-6-3. The annular groove 2-6-2, the fourteenth step 2-6-3, the step on the upper part of the sleeve 2-5 and the outer circle of the sleeve form an annular space with an upper opening, and a sealing gasket 2-4 is provided in the annular space.

[0098] Furthermore, Fig.18 As shown, the lower end surface of the top cylinder 2-2 is provided with an annular boss 2-2-1, which is aligned with the opening of the annular space, and the wall thickness of the annular boss 2-2-1 is equal to the width of the annular opening. The annular boss 2-2-1 moves downward during operation and is inserted into the annular opening to form a seal.

[0099] Furthermore, the rubber cylinder assembly 2 also includes a rubber cylinder 2-7, and the rubber cylinder 2-7 is sleeved on the fixed cylinder 2-6. Figure 4 , 21 As shown, an annular step groove 2-6-5 is provided on the upper part of the fixing cylinder 2-6, and the upper end of the rubber cylinder 2-7 is inserted into the annular step groove 2-6-5, so that the rubber cylinder 2-7 can be reliably positioned.

[0100] Furthermore, the rubber cylinder assembly 2 also includes a support cylinder 2-8, such as Figure 4 As shown, the support tube 2-8 is sleeved on the fixed tube 2-6, and the upper end surface of the support tube 2-8 abuts against the lower end surface of the rubber tube 2-7. The upper end surface of the support tube 2-8 is provided with an annular groove, and the lower end surface of the rubber tube 2-7 is inserted into the annular groove.

[0101] Furthermore, the rubber cartridge assembly 2 also includes a fixed plug 2-9, such as Figure 4 As shown, the fixed plug 2-9 is sleeved on the lower part of the fixed tube 2-6 and screwed with the fixed tube 2-6. The lower end of the fixed plug 2-9 is provided with a step, which abuts against the lower end of the fixed tube 2-6 to limit the distance that the fixed plug 2-9 is inserted into the fixed tube 2-6.

[0102] Furthermore, the fixed plug 2-9 is inserted into the lower part of the support tube 2-8 and screwed to the lower part of the support tube 2-8, so that the support tube 2-8 is fixedly connected with the fixed tube 2-6 and the sliding tube 2-3.

[0103] Furthermore, the rubber cylinder assembly 2 also includes a bottom cone slide cylinder 2-10, such as Figure 4 , 22 As shown, the bottom cone slide cylinder 2-10 is sleeved on the support cylinder 2-8 and screwed to the support cylinder 2-8.

[0104] Further, such as Figure 4 , 20 As shown in Figures 22, a circular hole is opened in the middle of the slide cylinder 2-3, and a circular hole is opened in the middle of the bottom cone slide cylinder 2-10. An annular space is formed between the inner cylinder 2-1 and the top cylinder 2-2, the sleeve 2-5, the fixed cylinder 2-6, the fixed plug 2-9 and the bottom cone slide cylinder 2-10. This annular space is connected with the circular holes of the slide cylinder 2-3 and the bottom cone slide cylinder 2-10 to form a pressure balance channel f.

[0105] Further, such as Figure 4 , 18 As shown, the up and down movement of the annular boss 2-2-1 can control the on and off of the pressure balance channel f.

[0106] The integrated fluid discharge tool for coiled tubing provided in this embodiment also includes a slip straightening assembly 3, such as Figure 1 , 2 As shown, the slip straightening assembly 3 is arranged below the rubber cylinder assembly 2.

[0107] Further, the slip straightening assembly 3 includes a central tube 3-1, such as Figure 5 , 23 As shown, the center tube 3-1 is sleeved on the lower part of the inner tube 2-1 and is threadedly connected to the inner tube 2-1. At the same time, the center tube 3-1 is inserted into the bottom cone slide tube 2-10 and is slidably connected to the bottom cone slide tube 2-10.

[0108] Furthermore, the inner hole of the central tube 3 - 1 is a connecting channel g, and the connecting channel g is connected to the inner channel e.

[0109] Further, the slip straightening assembly 3 also includes slips 3-2, such as Figure 5 , 24 As shown, the slip 3-2 is sleeved on the central tube 3-1 and is slidably connected to the central tube 3-1.

[0110] Furthermore, the slip straightening assembly 3 also includes a sliding cylinder 3-6, such as Figure 5 , 26 As shown, the sliding cylinder 3-6 is sleeved on the central cylinder and inserted into the lower part of the slip 3-2. The upper part of the sliding cylinder 3-6 is screwed to the lower part of the slip 3-2.

[0111] Furthermore, the slip straightening assembly 3 also includes straightening blocks 3-4, such as Figure 5 , 25As shown, the straightening block 3-4 is mounted on the sliding cylinder 3-6, and the upper end surface of the straightening block 3-4 abuts against the lower end surface of the slip 3-2. A step is provided at the lower part of the sliding cylinder 3-6, and the lower end surface of the straightening block 3-4 abuts against the step, so that the straightening block 3-4 is limited by the sliding cylinder 3-6 and the slip 3-2.

[0112] Furthermore, the slip straightening assembly 3 also includes a pressing block 3-3, such as Figure 5 As shown, the upper part of the pressing block 3-3 is sleeved on the lower part of the slip 3-2, and the pressing block 3-3 is provided with an internal thread and is screwed to the slip 3-2. The upper part of the straightening block 3-4 is inserted into the lower part of the pressing block 3-3, so that the position of the straightening block 3-4 is limited.

[0113] Furthermore, the slip straightening assembly 3 also includes a guide cylinder 3-10, such as Figure 5 , 27 As shown, the upper part of the guide cylinder 3-10 is sleeved on the lower part of the straightening block 3-4 and the sliding cylinder 3-6. The middle part of the guide cylinder 3-10 is provided with an internal thread and is screwed with the sliding cylinder 3-6, thereby completely limiting the position of the straightening block 3-4, and a space is left between the straightening block 3-4 and the sliding cylinder 3-6, so that the straightening block 3-4 can move along the radial direction of the sliding cylinder 3-6.

[0114] Further, such as Figure 5 , 25 As shown, the pressing block 3-3 is also provided with a blind hole, and the axial direction of the blind hole is in the same radial direction as the sliding cylinder 3-6. The blind hole can be provided with a spring 3-5, which pushes the straightening block 3-4 outward from the axis of the sliding cylinder 3-6 in the radial direction, so that the straightening block 3-4 is in contact with the inner wall of the pipe column and maintains a certain friction force.

[0115] Furthermore, the slip straightening assembly 3 also includes a slider 3-7, such as Figure 5 As shown, the upper end surface of the slider 3-7 abuts against the lower end surface of the sliding cylinder 3-6, and the lower end surface of the slider 3-7 abuts against the step at the lower part of the guide cylinder 3-10. The slider 3-7 is sleeved on the central cylinder, and the slider 3-7 is inserted into the guide cylinder 3-10, so that the slider 3-7 is clamped in the annular space formed by the guide cylinder 3-10, the sliding cylinder 3-6, and the central cylinder.

[0116] Further, such as Fig.23 As shown, a short track 3-1-1 and a long track 3-1-2 are arranged outside the central tube, and the short track 3-1-1 and the long track 3-1-2 are connected.

[0117] Furthermore, the slip straightening assembly 3 also includes a limit pin 3-8 and a pin 3-9. The limit pin 3-8 passes through the slider 3-7 in the radial direction and is inserted into the long track 3-1-2 or the short track 3-1-1 on the center tube. The pin 3-9 passes through the bottom of the guide tube 3-10 in the axial direction of the guide tube 3-10 and is inserted into the limit pin 3-8, so that the limit pin 3-8 is fixedly connected to the slider 3-7. Thus, the slip 3-2 and the straightening block 3-4 can slide along the short guide rail and the long guide rail under the guidance of the limit pin 3-8.

[0118] The working process of the integrated fluid discharge tool for coiled tubing provided in this embodiment is as follows:

[0119] The main body is composed of a hydraulic pump assembly 1, a top tube 2-2, an inner tube 2-1 and a central tube 3-1. The upper end of the continuous tubing drainage integrated tool is connected to the continuous tubing, and the continuous tubing drainage integrated tool is lowered into the well through the continuous tubing to a predetermined position. First, the continuous tubing is raised, so that the slips 3-2 and the straightening blocks 3-4 are guided by the limit pins 3-8 to enter the long track 3-1-2 from the short track 3-1-1; then the continuous tubing is lowered, and the slips 3-2 and the straightening blocks 3-4 remain stationary under the friction between the straightening blocks 3-4 and the inner wall of the pipe string. At this time, the continuous tubing drives the hydraulic pump assembly 1, the rubber cylinder assembly 2 and the central tube 3-1 to move downward, and then the bottom cone slide 2-10 at the bottom of the rubber cylinder assembly 2 gradually moves downward. Insert the slip 3-2 between the center tube, so that the slip 3-2 gradually opens and anchors on the inner wall of the pipe string; then the continuous tubing continues to be lowered, at this time the bottom cone slide 2-10 cannot move, the main body continues to move downward, the annular boss 2-2-1 on the top tube 2-2 squeezes the sealing pad 2-4 to close the pressure balance channel f; then the continuous tubing continues to be lowered, the main body pushes the slide 2-3 downward, because at this time the bottom cone slide 2-10 can no longer move, so the slide 2-3 and the bottom cone slide 2-10 squeeze the rubber tube 2-7, so that the rubber tube 2-7 expands to form a cross-section, and the pipe string and the annulus of the continuous tubing drainage integrated tool are separated. At this time, it is necessary to continuously apply pressure to the integrated tool through the continuous tubing to ensure the annulus is sealed and the pressure balance channel f is closed.

[0120] At this time, the power fluid is transported to the guide head 1-3 through the coiled tubing by the surface power pump, and then accelerated by the nozzle 1-5 and sprayed into the throat 1-7, generating negative pressure at the negative pressure area d, sucking the formation fluid to the negative pressure area d through the connecting channel g, the inner channel e, and the upper liquid channel a, and mixed with the power fluid at the throat 1-7. Then the mixed liquid flows downward through the diffusion channel b-2 and enters the drainage channel c. Since the annulus is sealed by the rubber cylinder 2-7, the mixed liquid cannot return to the underground through the annulus, and finally flows back to the ground driven by the power fluid to complete the drainage.

[0121] After the long-term drainage operation is completed, the continuous oil pipe is lifted up to separate the annular boss 2-2-1 from the sealing gasket 2-4, and the pressure balance channel f is opened to connect the annuli above and below the rubber cylinder 2-7 to ensure pressure balance, prevent the rubber cylinder 2-7 from expanding for a long time and being unable to retract when lifted up, thereby generating suction pressure, and eliminate the well control risk caused by suction pressure; continue to lift the continuous oil pipe, so that the fixed cylinder 2-6 and the bottom cone slide cylinder 2-10 move up, at this time the fixed cylinder 2-6 no longer squeezes the rubber cylinder 2-7, so that the rubber cylinder 2-7 reduces the expansion amount and releases the seal, and at the same time the bottom cone slide cylinder 2-10 moves up to disengage the slip 3-2, so that the slip 3-2 is released from the anchor, and finally the continuous oil pipe is lifted out with the integrated drainage tool.

[0122] By using continuous tubing to lower the continuous tubing into the well with an integrated drainage tool, the steps of inserting the pump core separately are reduced, the risk of the pump core failing to seat is avoided, and the operation process is simplified, reducing labor intensity and construction difficulty.

[0123] At the same time, since the diameter of the integrated drainage tool for continuous oil pipes is small, compared with the drainage method of using the oil pipe to enter the pump body and then put into the pump core, the liquid in the oil pipe can be drained after the oil pipe is installed, and the liquid in the casing can be drained before the oil pipe is installed, which is more adaptable.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, 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 embodiments of the present invention.

Claims

1. An integrated drainage tool for coiled tubing, characterized in that: It comprises a hydraulic pump assembly (1) and a rubber cartridge assembly (2) connected below the hydraulic pump assembly (1); The hydraulic pump assembly (1) comprises a pump barrel (1-1), wherein a longitudinally extending upper liquid channel (a), a longitudinally extending power liquid channel (b), and a transversely extending discharge channel (c) connected to the power liquid channel (b) are arranged in the pump barrel (1-1); a negative pressure area (d) is arranged in the middle section of the power liquid channel (b), and an outlet of the upper liquid channel (a) is connected to the negative pressure area (d); The rubber cylinder assembly (2) is provided with an inner channel (e), and the inner channel (e) is communicated with the upper liquid channel (a); the rubber cylinder assembly (2) is configured to be able to form a cross-sectional surface that cuts off the annular space between the pump cylinder (1-1) and the pipe wall in a squeezed state; The rubber cylinder assembly (2) comprises a rubber cylinder (2-7) and a pressure balancing channel (f) arranged along the axial direction of the rubber cylinder (2-7); The rubber cylinder (2-7) is subjected to a vertical downward extrusion force and protrudes toward the tube wall to form the cross-section surface; the two openings of the pressure balance channel (f) are respectively located above and below the rubber cylinder (2-7); The pressure balance channel (f) has an open state and a closed state. During the drainage process, the pressure balance channel (f) is in the closed state; during the removal of the integrated drainage tool, the pressure balance channel (f) is in the open state; The hydraulic pump assembly (1) further comprises a throat pipe (1-7), a diffuser A pipe (1-8), and a diffuser B pipe (1-9); The hydraulic pump assembly (1) further comprises a flow channel converter (1-10) arranged below the diffuser B tube (1-9), the flow channel converter (1-10) being provided with flow holes (1-10-1) and inner flow channels (1-10-3) that are isolated from each other; The flow hole (1-10-1) is in communication with the upper liquid channel (a), and the inner flow channel (1-10-3) is in communication with the power liquid channel (b).

2. The integrated drainage tool for coiled tubing according to claim 1, characterized in that: The power fluid channel (b) comprises an injection channel (b-1) and a diffusion channel (b-2) arranged below the injection channel (b-1); the outlet of the injection channel (b-1) and the inlet of the diffusion channel (b-2) are opposite to each other and are both connected to the negative pressure area (d); the outlet of the injection channel (b-1) extends into the diffusion channel (b-2), and the inner diameter of the diffusion channel (b-2) gradually increases from the inlet of the diffusion channel (b-2) to the outlet of the diffusion channel (b-2).

3. The integrated drainage tool for coiled tubing according to claim 2, characterized in that: The hydraulic pump assembly (1) comprises a guide head (1-3), a nozzle (1-5) connected below the guide head (1-3), and a nozzle sleeve (1-4) sleeved outside the nozzle (1-5); the inner hole of the guide head (1-3) and the inner hole of the nozzle (1-5) form the injection channel (b-1).

4. The integrated drainage tool for coiled tubing according to claim 3, characterized in that: The throat pipe (1-7) is arranged below the nozzle (1-5) and the throat pipe (1-7) is provided with an expansion hole facing the nozzle (1-5); The diffuser A tube (1-8) is arranged below the throat tube (1-7), and the diffuser B tube (1-9) is arranged below the diffuser A tube (1-8); The inner holes of the throat (1-7), the diffuser A tube (1-8) and the diffuser B tube (1-9) are connected to form the diffuser channel (b-2).

5. The integrated drainage tool for coiled tubing according to claim 4, characterized in that: The hydraulic pump assembly (1) further comprises a fixing sleeve (1-6), wherein the fixing sleeve (1-6) is sleeved on the throat (1-7), and an area enclosed by the nozzle sleeve (1-4), the nozzle (1-5), the throat (1-7) and the fixing sleeve (1-6) forms the negative pressure area (d).

6. The integrated drainage tool for coiled tubing according to claim 5, characterized in that: The hydraulic pump assembly (1) further comprises a wall attachment cylinder (1-2), wherein the wall attachment cylinder (1-2) is inserted into the pump cylinder (1-1) and sleeved on the fixing sleeve (1-6), the diffuser A tube (1-8) and the diffuser B tube (1-9); An annular space is formed between the wall-attached cylinder (1-2), the fixed sleeve (1-6), the diffuser A tube (1-8) and the diffuser B tube (1-9), and the annular space is the upper liquid channel (a).

7. The integrated fluid discharge tool for coiled tubing according to claim 6, characterized in that: The lower part of the pump barrel (1-1) is provided with a first liquid discharge port (1-1-1), the lower part of the wall-attached barrel (1-2) is provided with a second liquid discharge port (1-2-1), and the flow channel converter (1-10) is provided with a third liquid discharge port (1-10-2), and the third liquid discharge port (1-10-2) is communicated with the inner flow channel (1-10-3); The first liquid discharge port (1-1-1), the second liquid discharge port (1-2-1) and the third liquid discharge port (1-10-2) have the same shape and are aligned with each other, forming the liquid discharge channel (c).

8. The integrated fluid discharge tool for coiled tubing according to claim 7, characterized in that: It also includes a slip righting assembly (3) arranged below the rubber cylinder assembly (2), the slip righting assembly (3) comprising a slip (3-2) and a righting block (3-4) arranged below the slip (3-2), the slip righting assembly (3) being provided with a connecting channel (g), the connecting channel (g) being in communication with the inner channel (e).

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