Coiled tubing plug removal sampling device for oil jacket annulus

Abstract

The invention belongs to the technical field of oil extraction pipe plug removal equipment, and particularly relates to a coiled tubing plug removal sampling device for an oil sleeve annulus, which comprises a hydraulic winch and a coiled tubing, and further comprises a speed control assembly, and the speed control assembly is used for adjusting the lifting rate of the coiled tubing; by arranging the speed control assembly and utilizing the influence of the thickness of a wax layer in an oil jacket annulus on the positions of the fins, the frictional resistance during descending of the continuous oil pipe is changed, when the thickness of the wax layer is increased, the descending speed of the continuous oil pipe is gradually reduced, and continuously-erupted hot crude oil continuously exchanges heat with the wax layer; when the thickness of the wax layer is small, the speed of constant-speed descending of the continuous oil pipe is not affected, the plug removal efficiency of the oil sleeve annulus can be improved, and due to the fact that the eruption amount of the hot crude oil is small, in the whole plug removal process, the use amount of the hot crude oil is reduced, and the cost is reduced. Therefore, the heat for heating the crude oil is saved, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production pipe unblocking equipment, in particular to a continuous pipe unblocking sampling device for annulus of oil casing. Background Art

[0002] In the process of oilfield development and production, due to the potential damage factors of the oil and water wells themselves and the impact of the drilling, completion, cementing, well repair and production process, the oil and water wells are prone to blockage, resulting in a decrease in production or water injection, affecting the normal production plan of the oilfield.

[0003] The annulus of the oil casing of the oil tree is one of the locations that is more prone to blockage in the oil production equipment. It is often blocked due to wax deposition, structure and other reasons. Therefore, during the oil production process, the annulus of the oil casing needs to be deblocked frequently to avoid the influence of annular blockage on oil production, water injection, sampling and other operations. Among the conventional deblocking processes, the continuous tubing hot washing process is widely used in the construction of oil casing annulus deblocking and operating well deblocking due to its advantages of high deblocking efficiency, good cleaning effect and convenient operation. When the continuous tubing hot washing process is carried out, the continuous tubing is usually moved at a uniform speed to achieve uniform hot washing of the deblocking area. However, in actual application, it is found that due to the different degrees of blockage in each depth interval of the oil casing annulus, when the continuous tubing moves at a slow uniform speed, the deblocking efficiency will be low, and when the continuous tubing moves at a fast uniform speed, the deblocking effect will be poor, so that the advantages of the continuous tubing deblocking process cannot be brought into play.

[0004] Related technology discloses a continuous tubing abrasive particle jet unblocking and production-increasing device, application number CN2018111719454, which utilizes a continuous tubing to transport abrasive particles and completion fluid to a downhole rotating nozzle, and the high-speed abrasive particle jet ejected from the abrasive nozzle can quickly impact and crush blockages in sand control tools such as sand control pipe columns and sand and gravel layers, thereby accelerating the cleaning rate of the annulus. However, since it is impossible to accurately judge the degree of blockage in the tubing annulus, it is still impossible to judge the continuous tubing lifting rate and the degree of blockage in the tubing annulus, and thus it is necessary to sacrifice part of the cleaning rate or cleaning effect to achieve continuous unblocking of the tubing annulus.

[0005] In view of this, the present invention proposes a continuous tubing unblocking and sampling device for the oil casing annulus, which is used to solve the above technical problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a continuous tubing unblocking and sampling device for the oil casing annulus.

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: the coiled tubing unblocking sampling device for the casing annulus of the present invention comprises a hydraulic winch and a coiled tubing, the hydraulic winch is used to lift or lower the coiled tubing, and the coiled tubing is externally connected to a crude oil heating and pumping device;

[0008] Also included is a speed control assembly, the speed control assembly is used to adjust the lifting and lowering speed of the coiled tubing;

[0009] The speed control assembly includes a mounting ring, a fin, a support spring and a friction plate;

[0010] The mounting ring is fixedly mounted at the end of the coiled tubing, the inner diameter of the mounting ring is larger than the minimum diameter of the casing annulus, and the outer diameter of the mounting ring is smaller than the maximum diameter of the casing annulus;

[0011] The fins are designed in multiple numbers, and the fins are all rotatably mounted on the mounting ring, and a support spring is installed between the fins and the mounting ring;

[0012] A friction plate is hingedly mounted on one end of the fin away from the mounting ring, and the friction plate is frictionally connected to the inner wall of the oil sleeve annulus.

[0013] Preferably, a rotating groove is provided on the mounting ring, a swivel is rotatably installed in the rotating groove, an adjustment groove is provided on the mounting ring, the adjustment groove corresponds to the fin one by one, an adjustment block is slidably installed in the adjustment groove, the support spring is fixedly installed on the adjustment block, the adjustment block is designed with an inclined surface toward one end of the swivel, and the swivel extends into the adjustment groove to limit the adjustment block.

[0014] Preferably, dispersion pipes are installed on the mounting ring, and the dispersion pipes are evenly arranged along the circumferential direction of the mounting ring. A guide groove is opened on the mounting ring, and the dispersion pipes are conductively connected to the continuous oil pipe through the guide groove.

[0015] Preferably, the dispersion tube corresponds to the fin one by one, extends to the fin, deflects along with the fin, and opens vertically downward in the initial state. As the angle between the fin and the mounting ring decreases, the dispersion tube tilts toward the inner wall of the casing annulus.

[0016] Preferably, the coiled tubing comprises a continuous main pipe and a telescopic pipe, the telescopic pipe is made of a corrugated pipe, the telescopic pipe is fixedly mounted on the end of the continuous main pipe, and the mounting ring is fixedly mounted on the end of the telescopic pipe;

[0017] A triangular bracket is installed between the hydraulic winch and the oil casing annulus, a tensioner is installed on the triangular bracket, a fixed pulley is installed on the tensioner, and the middle part of the continuous oil pipe is slidably installed on the fixed pulley.

[0018] Preferably, a flow limiting ring is fixedly installed between the continuous main pipe and the telescopic pipe, and a flow limiting hole is provided on the flow limiting ring, and the flow limiting hole controls the oil pressure in the telescopic pipe.

[0019] Preferably, a telescopic groove is provided on the flow limiting ring, and the telescopic groove is conductively connected to the flow limiting hole. A baffle is elastically installed in the telescopic groove through a spring, and a transmission rope is fixedly installed on one end of the baffle away from the flow limiting hole. The transmission rope extends into the telescopic tube, and the end of the telescopic tube away from the continuous main pipe is fixedly connected to the transmission rope.

[0020] Preferably, elastic nets are fixedly installed between the plurality of fins, and a scraper is fixedly installed on the top of the friction plate.

[0021] Preferably, the mounting ring and the dispersion pipe are both made of heat-conducting material, a rotating shaft is rotatably mounted on the mounting ring, a paddle is fixedly mounted on the rotating shaft at the top of the mounting ring, a driven groove is opened on the mounting ring, the driven groove is conductively connected to the guide groove, the rotating shaft extends into the driven groove, a driven wheel is fixedly mounted on the rotating shaft in the driven groove, and the driven wheel extends into the guide groove.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The coiled tubing unblocking sampling device for the casing annulus of the present invention, by setting a speed control component, utilizes the influence of the wax layer thickness in the casing annulus on the fin position, thereby changing the friction resistance of the coiled tubing when it descends. When the wax layer thickness increases, the descent rate of the coiled tubing gradually decreases, and the continuously erupted hot crude oil continuously exchanges heat with the wax layer, thereby enhancing the heating and dissolving effect of the wax layer. When the wax layer thickness is small, the uniform descent rate of the coiled tubing is not affected, which not only improves the unblocking efficiency of the casing annulus, but also reduces the use of hot crude oil in the entire unblocking process due to the small amount of hot crude oil erupted, thereby saving the heat used for heating the crude oil, playing a role in energy conservation and emission reduction.

[0024] 2. The continuous tubing unblocking and sampling device for the casing annulus described in the present invention adopts a continuous main pipe and a telescopic pipe to form a continuous oil pipe. During the unblocking process of the casing annulus, the telescopic pipe is extended and shortened to reduce the influence of the change in the movement rate of the installation ring on the lowering rate of the continuous main pipe, thereby facilitating the staff to operate the hydraulic winch. At the same time, the telescopic pipe compensates for the difference in the movement rate of the continuous main pipe and the installation ring by shortening and extending. In actual application, the rate change of the installation ring in the blocked and unblocked areas is more obvious, further enhancing the targeted hot washing effect on the casing annulus. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is an overall schematic diagram of the present invention;

[0027] Figure 2 It is a stereogram of the assembly of the present invention and the oil casing annulus;

[0028] Figure 3 It is a partial structural stereogram of the present invention;

[0029] Figure 4 It is the assembly drawing of coiled tubing and speed control assembly;

[0030] Figure 5 is a stereogram of the mounting ring;

[0031] Figure 6 It is a partial structural cross-sectional view of the present invention;

[0032] Figure 7 yes Figure 6 A partial enlarged view of the middle A;

[0033] Figure 8 is a cross-sectional view of the driven groove and the guide groove;

[0034] Fig. 9 This is a three-dimensional diagram of the assembly of the driven wheel, the rotating shaft and the paddle;

[0035] Fig.10 is a cross-sectional view of the adjusting groove and the rotating groove;

[0036] Fig.11 yes Fig.10 A partial enlarged view of point B in the middle;

[0037] Fig.12 is a cross-sectional view of the current limiting ring;

[0038] In the figure: 1. continuous oil pipe; 11. continuous main pipe; 12. telescopic pipe; 2. mounting ring; 21. fin; 22. support spring; 23. friction plate; 24. rotating groove; 25. swivel; 26. adjustment groove; 27. adjustment block; 3. dispersion pipe; 31. guide groove; 4. flow limiting ring; 41. flow limiting hole; 42. telescopic groove; 43. baffle; 44. transmission rope; 5. elastic net; 51. scraper; 52. rotating shaft; 53. paddle; 54. driven groove; 55. driven wheel; 6. hydraulic winch; 61. triangular bracket; 62. tensioner; 63. fixed pulley. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] like Figures 1 to 12As shown, a coiled tubing unblocking sampling device for annular space of oil casing according to the present invention comprises a hydraulic winch 6 and a coiled tubing 1, wherein the hydraulic winch 6 is used to lift or lower the coiled tubing 1, and the coiled tubing 1 is externally connected to a crude oil heating and pumping device;

[0041] It also includes a speed control component, which is used to adjust the lifting and lowering speed of the coiled tubing 1;

[0042] The speed control assembly includes a mounting ring 2, a fin 21, a support spring 22 and a friction plate 23;

[0043] The mounting ring 2 is fixedly mounted at the end of the coiled tubing 1, the inner diameter of the mounting ring 2 is larger than the minimum diameter of the casing annulus, and the outer diameter of the mounting ring 2 is smaller than the maximum diameter of the casing annulus;

[0044] The fins 21 are designed in plural, and the fins 21 are all rotatably mounted on the mounting ring 2, and a support spring 22 is installed between the fins 21 and the mounting ring 2;

[0045] A friction plate 23 is hingedly mounted on one end of the fin 21 away from the mounting ring 2 , and the friction plate 23 is frictionally connected to the inner wall of the oil sleeve annulus.

[0046] When unblocking and sampling in the casing annulus, in order to maintain the cleaning effect and cleaning efficiency of the scale and wax in the casing annulus, a speed control component is provided in the present invention to control the movement rate of the continuous tubing 1 in the casing annulus. At the location where the wax and scale thickness is large, the movement rate of the continuous tubing 1 is reduced, thereby extending the hot washing time at the location, thereby enhancing the dissolution effect of the wax layer. At the location where there is no wax and scale, the lifting and lowering rate of the continuous tubing 1 is increased, thereby reducing the hot washing time at the location, thereby improving the cleaning efficiency of the casing annulus.

[0047] Specifically, when pyrolyzing the casing annulus, the staff first moves the continuous tubing 1 connected to the hydraulic winch 6 to the designated position, and then installs the injection head, wellhead blowout preventer and other supporting equipment. When the preparation work is completed, the staff pumps the crude oil heated to above 80°C into the continuous tubing 1 through the crude oil heating device and the crude oil pumping device, and opens the main valve of the oil tree to start lowering the continuous tubing 1. During the descending process of the continuous tubing 1 in the casing annulus, the heated crude oil is continuously sprayed, and the crude oil heats the casing annulus, thereby dissolving the wax layer attached to the inner wall of the casing annulus. In this process, the speed control component installed at the end of the continuous tubing 1 controls the descending rate of the continuous tubing 1, wherein the multiple fins 21 on the mounting ring 2 extend toward the two side walls of the casing annulus under the support effect of the support spring 22, and finally the friction plate 23 hinged at the end of the fin 21 contacts the inner wall of the casing annulus. As the thickness of the wax layer on the side wall of the oil casing annulus gradually increases, the fin 21 will be deflected, thereby increasing the compression of the support spring 22. Under the action of the reaction force, the pressure on the friction plate 23 increases, thereby increasing the friction resistance of the friction plate 23 when it moves. When the continuous oil pipe 1 descends, it relies on the gravity of the continuous oil pipe 1 to overcome the friction force. Therefore, when the dynamic friction of the friction plate 23 increases, the descending rate of the continuous oil pipe 1 will be reduced. When the thickness of the wax layer in the oil casing annulus is thin, the compression of the support spring 22 is small, so the dynamic friction resistance of the friction plate 23 is small, and the influence on the descending rate of the continuous oil pipe 1 is small, so the movement rate of the continuous oil pipe 1 is controlled. Since hot crude oil is continuously sprayed in the continuous oil pipe 1, within a certain distance, when the movement rate of the continuous oil pipe 1 is small, the crude oil spraying time is long, and the crude oil has a better thermal washing effect on the wax layer in this section of the path.

[0048] The present invention provides a speed control component and utilizes the influence of the wax layer thickness in the casing annulus on the position of the fin 21, thereby changing the friction resistance of the coiled tubing 1 when it descends. When the wax layer thickness increases, the descending rate of the coiled tubing 1 gradually decreases, and the continuously erupted hot crude oil continuously exchanges heat with the wax layer, thereby enhancing the heating and dissolving effect of the wax layer. When the wax layer thickness is small, the uniform descending rate of the coiled tubing 1 is not affected, which not only improves the efficiency of unblocking the casing annulus, but also reduces the amount of hot crude oil used in the entire unblocking process due to the small amount of hot crude oil erupted, thereby saving the heat used for heating the crude oil, and playing a role in energy saving and emission reduction.

[0049] As a preferred embodiment of the present invention, a rotating groove 24 is provided on the mounting ring 2, a rotating ring 25 is rotatably installed in the rotating groove 24, an adjusting groove 26 is provided on the mounting ring 2, the adjusting groove 26 corresponds to the fin 21 one by one, an adjusting block 27 is slidably installed in the adjusting groove 26, the support spring 22 is fixedly installed on the adjusting block 27, the adjusting block 27 is designed with an inclined surface toward one end of the rotating ring 25, and the rotating ring 25 extends into the adjusting groove 26 for limiting the adjusting block 27.

[0050] When the end of the coiled tubing 1 with the mounting ring 2 installed is lowered into the annulus of the casing, the staff manually rotates the swivel 25, causing the swivel 25 to rotate in the rotating groove 24. Since the swivel 25 extends to the adjusting groove 26, the swivel 25 pushes the adjusting block 27 to move in the adjusting groove 26 as the angle of the swivel 25 is adjusted. The fins 21 are connected to the adjusting block 27 through the supporting springs 22. Therefore, the rotation of the swivel 25 causes the diameter of the circular structure composed of the plurality of fins 21 to be adjusted, so as to facilitate the matching with the casing annulus of different diameters. When adjusting, the outer side of the mounting ring 2 is preferably adjusted as much as possible. The maximum diameter of the circular structure formed by the fins 21 is the same as the maximum diameter of the casing annulus, and the minimum diameter of the circular structure formed by the fins 21 on the inner side of the mounting ring 2 is the same as the minimum diameter of the casing annulus. It should be noted that there is friction resistance between the swivel 25 and the rotating groove 24. Therefore, when the swivel 25 is not manually adjusted, it can provide support force to the adjustment block 27. However, when the pressure applied by the adjustment block 27 to the swivel 25 is greater than the friction resistance when the swivel 25 rotates, the swivel 25 will rotate under the push of the adjustment block 27, thereby reducing the probability of the device getting stuck in the casing annulus.

[0051] As a preferred embodiment of the present invention, a dispersion pipe 3 is installed on the mounting ring 2, and the dispersion pipe 3 is evenly arranged along the circumferential direction of the mounting ring 2. A guide groove 31 is opened on the mounting ring 2, and the dispersion pipe 3 is conductively connected to the coiled tubing 1 through the guide groove 31.

[0052] The dispersion pipe 3 corresponds to the fin 21 one by one, and extends to the fin 21. The dispersion pipe 3 deflects along with the fin 21. In the initial state, the dispersion pipe 3 opens vertically downward. As the angle between the fin 21 and the mounting ring 2 decreases, the dispersion pipe 3 tilts toward the inner wall of the oil casing annulus.

[0053] In order to enhance the unblocking effect on the casing annulus, a plurality of dispersion pipes 3 are provided in the present invention, and the plurality of dispersion pipes 3 are connected to the continuous oil pipe 1 through the guide groove 31. Therefore, when the hot crude oil flows, the continuous oil pipe 1 flows into the guide groove 31 and the dispersion pipe 3 in sequence, and finally sprays out from the opening of the dispersion pipe 3. Since the dispersion pipes 3 are evenly distributed along the circumferential direction of the mounting ring 2, the hot crude oil can be evenly sprayed in the casing annulus. When the dispersion pipes 3 are mounted on the fins 21, the dispersion pipes 3 rotate together with the fins 21. When the wax layer is thin, the angle between the fins 21 and the mounting ring 2 is large, and the deviation angle of the dispersion pipes 3 from the vertical direction is small, so that the hot crude oil is sprayed downward to impact the wax layer that may exist below. When the wax layer is thick, the angle between the fins 21 and the mounting ring 2 is reduced, so that the deviation of the dispersion pipes 3 from the vertical direction is greatly increased, so that the hot crude oil sprayed by the dispersion pipes 3 heat washes the wax layer on the side wall of the casing annulus, thereby enhancing the unblocking effect on the casing annulus.

[0054] As a preferred embodiment of the present invention, the coiled tubing 1 comprises a continuous main pipe 11 and a telescopic pipe 12, wherein the telescopic pipe 12 is made of a corrugated pipe, the telescopic pipe 12 is fixedly mounted at the end of the continuous main pipe 11, and the mounting ring 2 is fixedly mounted at the end of the telescopic pipe 12;

[0055] A triangular bracket 61 is installed between the hydraulic winch 6 and the oil casing annulus, a tensioner 62 is installed on the triangular bracket 61, a fixed pulley 63 is installed on the tensioner 62, and the middle part of the coiled tubing 1 is slidably installed on the fixed pulley 63.

[0056] A flow limiting ring 4 is fixedly installed between the continuous main pipe 11 and the telescopic pipe 12 . A flow limiting hole 41 is provided on the flow limiting ring 4 . The flow limiting hole 41 controls the oil pressure in the telescopic pipe 12 .

[0057] In actual operation, the coiled tubing 1 is composed of a continuous main pipe 11 and a telescopic pipe 12, wherein the telescopic pipe 12 is fixedly installed at the end of the continuous main pipe 11, and the telescopic pipe 12 is composed of a corrugated pipe. Therefore, when the coiled tubing 1 is lowered into the annulus of the oil casing, the telescopic pipe 12 is in a fully extended state under the action of gravity. As the descent continues, when the friction resistance between the friction plate 23 and the annulus of the oil casing increases, the descent rate of the mounting ring 2 decreases, and the hydraulic winch 6 continues to operate at a uniform speed to continuously lower the coiled tubing 1 into the annulus of the oil casing, so that the telescopic pipe 12 is gradually shortened at this time. When the blockage is removed at the current stage, the telescopic pipe 12 is gradually shortened. When the friction plate 23 is moved downward, the friction resistance of the friction plate 23 is reduced, so that the mounting ring 2 can move downward quickly, and the telescopic tube 12 is extended again. Since the limiting flow ring 4 is installed between the telescopic tube 12 and the continuous main tube 11, the limiting hole 41 on the limiting flow ring 4 can control the flow rate of the crude oil into the telescopic tube 12. Therefore, the oil pressure in the telescopic tube 12 is relatively small, reducing the influence of the oil pressure on the length extension of the telescopic tube 12. At the same time, when lowering the continuous oil pipe 1, the staff continuously observes the tensioner 62 and the fixed pulley 63 to prevent the pipeline from jumping slots, carefully records the value of the tensioner 62, and lifts and lowers it when encountering resistance. It is strictly forbidden to lift and lower it under overload.

[0058] In the present invention, a continuous main pipe 11 and a telescopic pipe 12 are used to form a continuous oil pipe 1. In the process of unblocking the casing annulus, the telescopic pipe 12 is extended and shortened to reduce the influence of the movement rate change of the installation ring 2 on the lowering rate of the continuous main pipe 11, thereby facilitating the staff to operate the hydraulic winch 6. At the same time, the telescopic pipe 12 compensates for the difference in movement rate between the continuous main pipe 11 and the installation ring 2 by shortening and extending. In actual application, the speed change of the installation ring 2 in the blocked and unblocked areas is more obvious, further enhancing the targeted hot washing effect on the casing annulus.

[0059] As a preferred embodiment of the present invention, a telescopic groove 42 is provided on the flow limiting ring 4, and the telescopic groove 42 is conductively connected to the flow limiting hole 41. A baffle 43 is elastically installed in the telescopic groove 42 through a spring, and a transmission rope 44 is fixedly installed at one end of the baffle 43 away from the flow limiting hole 41. The transmission rope 44 extends into the telescopic tube 12, and the telescopic tube 12 is fixedly connected to the transmission rope 44 at one end away from the continuous main pipe 11.

[0060] In the initial state, the telescopic tube 12 is fully extended under the influence of gravity. At this time, the telescopic tube 12 pulls the transmission rope 44, causing the baffle 43 to move from the telescopic groove 42 to the flow-limiting hole 41, thereby blocking the flow-limiting hole 41, so that the flow rate of crude oil into the telescopic tube 12 is reduced. In conjunction with the crude oil heating and pumping device, the oil pressure in the continuous main pipe 11 is maintained. At this time, the flow rate of hot crude oil into the oil casing annulus is reduced, and when the resistance of the friction plate 23 increases, causing the descending rate of the mounting ring 2 to decrease, the telescopic tube 12 is gradually shortened, and in the elastic Under the action of the spring, the baffle 43 is reset, so that the blocked area of ​​the flow limiting hole 41 continues to decrease, thereby increasing the flow rate of crude oil into the telescopic tube 12, and the crude oil is sprayed into the oil casing annulus through the telescopic tube 12, the guide groove, and the dispersion pipe 3, thereby heat washing the wax layer in the oil casing annulus. Therefore, during the entire hot washing and unblocking process of the oil casing annulus, the hot crude oil is concentratedly sprayed in the area with a thicker wax layer. On the premise of ensuring the unblocking effect, the use of hot crude oil can be effectively reduced, thereby reducing the energy consumption of the crude oil heating device, and contributing to energy conservation and emission reduction.

[0061] As a preferred embodiment of the present invention, elastic nets 5 are fixedly installed between the plurality of fins 21 , and a scraper 51 is fixedly installed on the top of the friction plate 23 .

[0062] The mounting ring 2 and the dispersion pipe 3 are both made of heat-conducting material. A rotating shaft 52 is rotatably mounted on the mounting ring 2. A paddle 53 is fixedly mounted on the rotating shaft 52 at the top of the mounting ring 2. A driven groove 54 is opened on the mounting ring 2. The driven groove 54 is conductively connected to the guide groove 31. The rotating shaft 52 extends into the driven groove 54. A driven wheel 55 is fixedly mounted on the rotating shaft 52 located in the driven groove 54. The driven wheel 55 extends into the guide groove 31.

[0063] When the mounting ring 2 is lowered to the maximum movement depth of the coiled tubing 1, the hydraulic winch 6 works in the reverse direction, causing the coiled tubing 1 to be wound, and the mounting ring 2 rises in the casing annulus. At this time, under the action of friction, the scraper scrapes the inner wall of the casing annulus to scrape off the wax layer and scale layer remaining on the inner wall of the casing annulus. The fallen wax layer and scale layer are intercepted by the elastic net 5 and concentrated around the mounting ring 2. When the hot crude oil flows in the guide groove 31 inside the mounting ring 2, it will exchange heat with the mounting ring 2, thereby dissolving the wax layer. When its volume is smaller than the mesh of the elastic net 5, it can fall into the casing annulus. When the hot crude oil flows in a directional manner in the guide groove 31, it scours the driven wheel 55, causing the driven wheel 55, the rotating shaft 52, and the paddle 53 to rotate. When the paddle 53 rotates, the wax layer is moved, thereby enhancing the effect of heating and breaking the wax layer.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A coiled tubing unblocking and sampling device for annular space of an oil casing, comprising a hydraulic winch (6) and a coiled tubing (1), wherein the hydraulic winch (6) is used to lift or lower the coiled tubing (1), and the coiled tubing (1) is externally connected to a crude oil heating and pumping device; Features: It also includes a speed control component, which is used to adjust the lifting and lowering speed of the coiled tubing (1); The speed control assembly comprises a mounting ring (2), a fin (21), a support spring (22) and a friction plate (23); The mounting ring (2) is fixedly mounted on the end of the coiled tubing (1), the inner diameter of the mounting ring (2) is larger than the minimum diameter of the casing annulus, and the outer diameter of the mounting ring (2) is smaller than the maximum diameter of the casing annulus; The fins (21) are designed in plurality, and the fins (21) are all rotatably mounted on the mounting ring (2), and a supporting spring (22) is installed between the fins (21) and the mounting ring (2); A friction plate (23) is hingedly mounted on one end of the fin (21) away from the mounting ring (2), and the friction plate (23) is frictionally connected to the inner wall of the oil sleeve annulus.

2. A coiled tubing unblocking sampling device for oil casing annulus according to claim 1, characterized in that: The mounting ring (2) is provided with a rotation groove (24), a rotating ring (25) is rotatably mounted in the rotation groove (24), an adjusting groove (26) is provided on the mounting ring (2), the adjusting groove (26) corresponds to the fin (21) one by one, an adjusting block (27) is slidably mounted in the adjusting groove (26), the supporting spring (22) is fixedly mounted on the adjusting block (27), the adjusting block (27) is designed with an inclined surface at one end facing the rotating ring (25), and the rotating ring (25) extends into the adjusting groove (26) for limiting the adjusting block (27).

3. The coiled tubing unblocking sampling device for the oil casing annulus according to claim 1, characterized in that: The mounting ring (2) is provided with dispersion pipes (3), the dispersion pipes (3) are evenly arranged along the circumferential direction of the mounting ring (2), the mounting ring (2) is provided with guide grooves (31), and the dispersion pipes (3) are conductively connected to the coiled tubing (1) via the guide grooves (31).

4. The coiled tubing unblocking sampling device for the casing annulus according to claim 3 is characterized in that: The dispersion pipe (3) corresponds to the fin (21) one by one, and the dispersion pipe (3) extends to the fin (21). The dispersion pipe (3) deflects along with the fin (21). In an initial state, the dispersion pipe (3) opens vertically downward. As the angle between the fin (21) and the mounting ring (2) decreases, the dispersion pipe (3) tilts toward the inner wall of the oil casing annulus.

5. A coiled tubing unblocking sampling device for oil casing annulus according to claim 2 or 4, characterized in that: The coiled tubing (1) comprises a continuous main pipe (11) and a telescopic pipe (12), wherein the telescopic pipe (12) is made of a corrugated pipe, the telescopic pipe (12) is fixedly mounted on the end of the continuous main pipe (11), and the mounting ring (2) is fixedly mounted on the end of the telescopic pipe (12); A triangular bracket (61) is installed between the hydraulic winch (6) and the oil casing annulus, a tensioner (62) is installed on the triangular bracket (61), a fixed pulley (63) is installed on the tensioner (62), and the middle part of the coiled tubing (1) is slidably installed on the fixed pulley (63).

6. The coiled tubing unblocking sampling device for the casing annulus according to claim 5, characterized in that: A flow limiting ring (4) is fixedly installed between the continuous main pipe (11) and the telescopic pipe (12), and a flow limiting hole (41) is provided on the flow limiting ring (4), and the flow limiting hole (41) controls the oil pressure in the telescopic pipe (12).

7. A coiled tubing unblocking sampling device for oil casing annulus according to claim 6, characterized in that: The limiting ring (4) is provided with a telescopic groove (42), the telescopic groove (42) is in conductive connection with the limiting hole (41), a baffle (43) is elastically mounted in the telescopic groove (42) via a spring, a transmission rope (44) is fixedly mounted on one end of the baffle (43) away from the limiting hole (41), the transmission rope (44) extends into the telescopic tube (12), and the end of the telescopic tube (12) away from the continuous main tube (11) is fixedly connected to the transmission rope (44).

8. A coiled tubing unblocking sampling device for oil casing annulus according to claim 1 or 7, characterized in that: An elastic net (5) is fixedly installed between the plurality of fins (21), and a scraper (51) is fixedly installed on the top of the friction plate (23).

9. A coiled tubing unblocking sampling device for oil casing annulus according to claim 8, characterized in that: The mounting ring (2) and the dispersion pipe (3) are both made of heat-conducting material. A rotating shaft (52) is rotatably mounted on the mounting ring (2). A paddle (53) is fixedly mounted on the rotating shaft (52) at the top of the mounting ring (2). A driven groove (54) is provided on the mounting ring (2). The driven groove (54) is conductively connected to the guide groove (31). The rotating shaft (52) extends into the driven groove (54). A driven wheel (55) is fixedly mounted on the rotating shaft (52) in the driven groove (54). The driven wheel (55) extends into the guide groove (31).

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