A scale-prevention type thickened oil downhole electric heating and temperature-pressure monitoring integrated cable

Abstract

The present application relates to the technical field of oil exploitation, and provides a scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable for thick oil, which comprises a cable main body, a joint arranged at the bottom of the cable main body, a fixing assembly arranged at the through slot of the joint, and a positioning assembly arranged at the jointing position of the cable main body and the joint; through the cooperative design of the limiting rod one and the rubber skin sleeve in the positioning assembly, the damage of the cable caused by excessive clamping force is avoided, and the friction force is enhanced through the rubber layer with a thickness of more than 5 mm to prevent sliding; the structure of the rotating rod driving the limiting ring in the positioning assembly realizes the dynamic clamping and releasing of the cable main body; when the cable is lowered, the slope two of the L rod one and the fixing block three are matched to automatically trigger the reverse rotation of the limiting ring, so that the limiting cylinder is slid to the middle of the jointing head of the joint and the downhole cable and is locked again, the problem that the traditional joint is prone to loosening under high temperature and high pressure is solved, and the continuity of the electric heating and monitoring is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, in particular to a scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable for thick oil. BACKGROUND

[0002] With the continuous growth of global energy demand, thick oil as an important unconventional oil and gas resource has been increasingly valued for its development and utilization. In this context, electric heating technology has gradually become a research hotspot in the field of thick oil exploitation due to its direct action on wellbore fluid and high heating efficiency. By reducing the viscosity of thick oil through electric heating, its flowability can be effectively improved, and the recovery rate can be increased.

[0003] In this context, electric heating technology has gradually become a research hotspot in the field of thick oil exploitation due to its direct action on wellbore fluid and high heating efficiency. By reducing the viscosity of thick oil through electric heating, its flowability can be effectively improved, and the recovery rate can be increased. However, the traditional electric heating cable faces the following challenges when applied in the complex downhole environment:

[0004] 1. Insufficient connection stability: the connection between the cable and the joint is prone to loosening due to high temperature, high pressure and vibration in the downhole, causing electric heating interruption or monitoring data distortion, and even causing equipment damage;

[0005] 2. Weak self-adaptability: uneven structures such as well wall protrusions and scale deposits can easily cause cable sliding or jamming, affecting the precision of lowering and operation efficiency;

[0006] 3. Conflict between scale prevention and integration: scale prevention coating or structural design may sacrifice the mechanical strength of the cable, while the integration of electric heating and monitoring functions requires higher space layout, which is difficult to achieve with traditional design;

[0007] 4. Lack of vibration cushioning: vibration caused by downhole pumping or formation activity can easily cause fatigue fracture at the connection site, shortening the service life of the equipment.

[0008] To solve the above problems, the present application proposes a scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable for thick oil. SUMMARY

[0009] The present application provides a scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable for thick oil, which allows the operator to adjust the length of the roller extension according to the distance between the well wall and the connection port through the linkage of the limiting rod two and the spring, ensuring the precision of the butt joint. When the roller is pushed by the protrusion of the well wall, the U-shaped block compresses the spring and slides along the limiting rod two, achieving non-destructive passage through complex structures and avoiding jamming. This design not only improves the efficiency of cable lowering, but also prolongs the service life of the equipment by absorbing operation vibration through the spring buffer, especially suitable for thick oil well environments with scale deposits or irregular well walls, to solve the problems raised in the background art.

[0010] The technical scheme of the present application is as follows:

[0011] A scale-prevention type thickened oil downhole electric heating and temperature-pressure monitoring integrated cable comprises a cable main body and a joint provided at the bottom of the cable main body, one side of the joint is provided with a clamping groove, an insulation layer of the joint is provided with a through groove, the joint is provided with a fixing assembly at the through groove, a connecting position between the cable main body and the joint is provided with a positioning assembly, and the outer side of the positioning assembly is provided with an adaptive assembly.

[0012] The fixing assembly comprises a push rod slidingly connected in the through groove, the push rod penetrates through the through groove, the outer side of the joint is fixedly connected with a first fixing block at the top of the through groove, the joint is fixedly connected with a second fixing block at the bottom of the first fixing block, and the joint is fixedly connected with a third fixing block at one side of the second fixing block.

[0013] The top of the push rod is provided with an inclined surface one, one side of the first fixing block is provided with a large L-shaped groove, the bottom of the large L-shaped groove is provided with a small L-shaped groove with the same size as the push rod, the second fixing block is in an L shape, and the third fixing block is provided with an inclined surface two close to one side of the second fixing block.

[0014] The positioning assembly comprises an L-shaped rod one connected with the large L-shaped groove at one end, the short end of the L-shaped rod one is slidingly connected with the large L-shaped groove, the long end of the L-shaped rod one is fixedly connected with a rotating rod, both ends of the rotating rod are rotatably connected with limiting rings, the rotating rod can only rotate by 30° on the limiting rings, a limiting cylinder is rotatably connected between the two limiting rings, both ends of the limiting cylinder are respectively provided with two groups of limiting blocks one, two groups of limiting blocks two are fixedly connected with the two limiting rings respectively and opposite to each other, and the two groups of limiting blocks one and the two groups of limiting blocks two are symmetrically distributed.

[0015] The adaptive assembly comprises a limiting rod two slidingly connected on the limiting cylinder, a plurality of limiting grooves are formed in the limiting rod two, the limiting rod two penetrates through the side wall of the limiting cylinder, a L-shaped block is slidingly connected to one end of the limiting rod two away from the limiting cylinder, a spring is fixedly connected between the limiting cylinder and the L-shaped block, and a roller is rotatably connected in the L-shaped block.

[0016] Further, a square groove is formed in the side wall of the limiting cylinder, the rotating rod penetrates through the square groove, a clamping block is fixedly connected to the inner wall of the limiting cylinder, and the clamping block is slidingly connected with the clamping groove, so as to limit the position of the limiting cylinder.

[0017] Further, the limiting block one group includes two limiting block ones, one of which is fixedly connected to the limiting cylinder, and the other is fixedly connected to the limiting ring, and the two limiting block ones are axisymmetric.

[0018] The limiting block two group includes two limiting block twos, one of which is fixedly connected to the limiting cylinder, and the other is fixedly connected to the limiting ring, and the two limiting block twos are axisymmetric.

[0019] Further, the middle part of the limiting rod one is fixedly connected with a rubber sheath, the thickness of the rubber sheath should not be less than 5mm, which prevents the clamping force from being too large to cause damage to the cable body and joint, and increases the friction to prevent the cable body and joint from sliding up and down, further increases the clamping force, and the connecting part of the limiting rod one and the limiting block one and the limiting block two on the limiting ring is reserved with a rotating space, and the limiting rod one connected with the joint can determine whether the limiting rod one adopts a middle curved rod material according to the joint diameter.

[0020] Further, the limiting cylinder is provided with an L-shaped groove at the limiting rod two, the short side of the L-shaped groove is at the top of the limiting cylinder, and an L-shaped rod two is slidably connected in the L-shaped groove, the diameter of the L-shaped rod two is the same as that of the limiting groove, one end of the limiting rod two fixedly connected with the L-shaped block is fixedly connected with a cylindrical block, both ends of the L-shaped block are provided with a circular groove one with the same diameter as that of the cylindrical block, and the L-shaped block is provided with a circular groove two with the same diameter as that of the limiting rod two on one side of the circular groove one.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1、The present application cooperates the limiting rod one and the rubber sheath in the positioning assembly, which not only avoids damage to the cable caused by excessive clamping force, but also enhances the friction by the rubber layer with a thickness of more than 5mm to prevent sliding; the structure of the rotating rod driving the limiting ring in the positioning assembly realizes dynamic clamping and releasing of the cable body, when the cable is lowered, the L-shaped rod one cooperates with the inclined surface two of the fixed block three, which can automatically trigger the reverse rotation of the limiting ring, so that the limiting cylinder slides to the middle of the joint and the connecting head and is locked again, solving the problem of loose connection caused by high temperature and high pressure in the traditional connection, and ensuring the continuity of electric heating and monitoring.

[0023] 2、The application allows workers to adjust the length of the roller extension according to the distance between the well wall and the connecting port through the linkage of the limiting rod two and the spring, ensuring the docking accuracy; when the roller is pushed by the protrusion of the well wall, the U-shaped block compresses the spring and slides along the limiting rod two, realizing non-destructive passing through complex structures and avoiding jamming, which not only improves the cable lowering efficiency, but also prolongs the service life of the equipment by absorbing the operation vibration through the spring buffer, and is especially suitable for thick oil well environments with scale deposition or irregular well walls. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the device structure diagram of the application;

[0025] Figure 2 is the device cross-sectional view of the application;

[0026] Figure 3 is the device positioning assembly structure diagram of the application;

[0027] Figure 4 is the device limiting cylinder cross-sectional view of the application;

[0028] Figure 5 is the device fixed block one structure diagram of the application;

[0029] Figure 6 is the device U-shaped block cross-sectional view of the application;

[0030] Figure 7 is the device Figure 2 A enlarged view of the application.

[0031] In the figure:

[0032] 1, cable main body; 2, joint; 21, clamping groove; 3, through groove; 4, fixed assembly; 41, push rod; 411, inclined surface one; 42, fixed block one; 421, large U-shaped groove; 422, small U-shaped groove; 43, fixed block two; 44, fixed block three; 441, inclined surface two; 5, positioning assembly; 51, L rod one; 52, rotating rod; 53, limiting ring; 54, limiting cylinder; 541, square groove; 542, clamping block; 55, limiting block one group; 551, limiting block one; 56, limiting block two group; 561, limiting block two; 57, limiting rod one; 571, rubber sleeve; 6, self-adapting assembly; 61, limiting rod two; 611, L groove; 612, L rod two; 613, cylindrical block; 614, circular groove one; 615, circular groove two; 62, limiting groove; 63, U-shaped block; 64, spring; 65, roller. DETAILED DESCRIPTION

[0033] The embodiments of the application will be further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the application, but cannot be used to limit the scope of the application.

[0034] AsFigures 1-7 As shown, the present application provides a scale prevention type thick oil downhole electric heating and temperature and pressure monitoring integrated cable, which comprises a cable main body 1, a connector 2 arranged at the bottom of the cable main body 1, a clamping groove 21 formed on one side of the connector 2, a through groove 3 formed at the insulating layer of the connector 2, a fixing assembly 4 arranged at the through groove 3 of the connector 2, a positioning assembly 5 arranged at the connection between the cable main body 1 and the connector 2, and a self-adapting assembly 6 arranged at the outer side of the positioning assembly 5.

[0035] The fixing assembly 4 comprises a push rod 41 slidably connected in the through groove 3, the push rod 41 penetrates through the through groove 3, a fixed block one 42 is fixedly connected at the top of the through groove 3 at the outer side of the connector 2, a fixed block two 43 is fixedly connected at the bottom of the fixed block one 42 on the connector 2, and a fixed block three 44 is fixedly connected at one side of the fixed block two 43 on the connector 2.

[0036] The top of the push rod 41 is provided with an inclined surface one 411, a large L-shaped groove 421 is formed at one side of the fixed block one 42, a small L-shaped groove 422 with the same size as the push rod 41 is formed at the bottom of the large L-shaped groove 421, the fixed block two 43 is L-shaped, and an inclined surface two 441 is arranged at the side close to the fixed block two 43 of the fixed block three 44.

[0037] The positioning assembly 5 comprises an L-shaped rod one 51 connected at one end with the large L-shaped groove 421, the short end of the L-shaped rod one 51 is slidably connected with the large L-shaped groove 421, a rotating rod 52 is fixedly connected at the long end of the L-shaped rod one 51, limit rings 53 are rotationally connected at both ends of the rotating rod 52, the rotating rod 52 can only rotate 30° on the limit ring 53, a limit cylinder 54 is rotationally connected between the two limit rings 53, two groups of limit block one groups 55 are arranged at both ends of the limit cylinder 54, two groups of limit block two groups 56 are fixedly connected at the sides away from each other of the two limit rings 53, the two groups of limit block one groups 55 and the two groups of limit block two groups 56 are symmetrically distributed, and a limit rod one 57 is arranged between each group of the limit block one groups 55 and each group of the limit block two groups 56.

[0038] The self-adapting assembly 6 comprises a limit rod two 61 slidably connected on the limit cylinder 54, a plurality of limit grooves 62 are formed on the limit rod two 61, the limit rod two 61 penetrates through the side wall of the limit cylinder 54, a L-shaped block 63 is slidably connected at the end away from the limit cylinder 54 of the limit rod two 61, a spring 64 is fixedly connected between the limit cylinder 54 and the L-shaped block 63, and a roller 65 is rotationally connected in the L-shaped block 63.

[0039] As a technical scheme of the present application, the side wall of the limiting cylinder 54 is provided with a square groove 541, the rotating rod 52 penetrates through the square groove 541, the inner wall of the limiting cylinder 54 is fixedly connected with a clamping block 542, and the clamping block 542 is in sliding connection with the clamping groove 21, for limiting the position of the limiting cylinder 54.

[0040] As a technical scheme of the present application, the limiting block group one 55 includes two limiting blocks one 551, one of which is fixedly connected to the limiting cylinder 54, and the other is fixedly connected to the limiting ring 53, and the two limiting blocks one 551 are axisymmetric.

[0041] The limiting block group two 56 includes two limiting blocks two 561, one of which is fixedly connected to the limiting cylinder 54, and the other is fixedly connected to the limiting ring 53, and the two limiting blocks two 561 are axisymmetric.

[0042] As a technical scheme of the present application, the middle part of the limiting rod one 57 is fixedly connected with a rubber sheath 571, the thickness of the rubber sheath 571 should not be less than 5mm, which prevents the clamping force from being too large to cause damage to the cable main body 1 and the joint 2, and increases the friction to prevent the cable main body 1 and the joint 2 from sliding up and down, further increasing the clamping force, and the connecting part of the limiting rod one 57 and the limiting block one 551 and the limiting block two 561 on the limiting ring 53 is reserved with a rotating space, which facilitates the rotation of the limiting ring 53 to drive the limiting rod one 57, and the limiting rod one 57 connected with the joint 2 can determine whether the limiting rod one 57 adopts a middle curved rod material according to the diameter of the joint 2.

[0043] As a technical scheme of the present application, the limiting cylinder 54 is provided with an L-shaped groove 611 at the limiting rod two 61, the short side of the L-shaped groove 611 is at the top of the limiting cylinder 54, an L-shaped rod two 612 is in sliding connection in the L-shaped groove 611, the diameter of the L-shaped rod two 612 is the same as that of the limiting groove 62, one end of the limiting rod two 61 fixedly connected with the L-shaped block 63 is fixedly connected with a cylindrical block 613, both ends of the L-shaped block 63 are provided with a circular groove one 614 with the same diameter as that of the cylindrical block 613, and the L-shaped block 63 is provided with a circular groove two 615 with the same diameter as that of the limiting rod two 611 on one side of the circular groove one 614, when the staff clamps the L-shaped rod one 51 into the limiting groove 62 to limit the position of the limiting rod two 61, the cylindrical block 613 cannot slide into the circular groove two 615 due to the larger diameter, thereby controlling the extendable distance of the L-shaped block 63.

[0044] Working principle:

[0045] As Figures 1-4And Figure 7 As shown, first, the staff will pass through the cable body 1 in the limiting cylinder 54, and the block 542 and the card slot 21 are mutually clamped, and the limiting cylinder 54 is located between the cable body 1 and the joint 2, it should be noted that: the square slot 541 on the limiting cylinder 54 is opposite to the fixed block one 42, so that the L rod one 51 is located on one side of the fixed block one 42; Then, the staff rotates the rotating rod 52, so that the L rod one 51 is separated from the large L-shaped slot 421, then, the staff pulls the rotating rod 52, so that the rotating rod 52 drives the limiting ring 53 to rotate on the limiting cylinder 54, when the limiting ring 53 rotates, the limiting block one 551 and the limiting block two 561 connected with the limiting ring 53 rotate, and drive one end of the limiting rod one 57 to rotate, the limiting rod one 57 reduces the gap between each limiting rod one 57 in the process of rotating, clamps the cable body 1 and the joint 2, when the fixing is completed, the staff reverses the rotating rod 52, the rotating rod 52 drives the L rod one 51 to rotate synchronously, so that the short end of the L rod one 51 is clamped into the large L-shaped slot 421; Because the limiting rod one 57 is fixedly connected with the rubber sleeve 571 with a thickness of not less than 5mm in the middle, it prevents the clamping force from being too large to damage the cable body 1 and the joint 2 during the fixing process, and increases the friction to prevent the cable body 1 and the joint 2 from sliding up and down, further increases the clamping force;

[0046] As Figures 1-2 And Figures 5-7 As shown, then, the staff adjusts the length of the roller 65 in the three groups of self-adapting components 6 according to the position of the connecting port in the well, so that the joint 2 can be connected with the connecting port accurately after being placed down; The staff pulls one end of the L rod two 612, so that the L rod two 612 slides in the L slot 611, and the other end of the L rod two 612 is separated from the limiting slot 62, the staff pulls the limiting rod two 61, and adjusts the length of each limiting rod two 61, so that the distance between the connecting port and the inner wall of the well is the same, then the staff lowers the L rod two 612, so that the L rod two 612 is inserted into the limiting slot 62 again, the limiting rod two 61 is limited, and the L rod two 612 is clamped into the L slot 611, to prevent displacement of the limiting structure in the self-adapting component 6 due to collision when placing the cable;

[0047] When the cable body 1 and the joint 2 are placed down in the well, the roller 65 slides on the inner wall of the well, when encountering the protruding structure in the well, the roller 65 moves to the limiting cylinder 54 direction under the thrust of the protruding structure, and drives the L-shaped block 63 to move synchronously, at this time, the L-shaped block 63 slides on the limiting rod two 61 through the round slot one 614 and the round slot two 615, and compresses the spring 64, so that the roller 65 can slide down without resistance, and will not damage other protruding structures in the well, and when the joint 2 is connected with the connecting head 2 in the well, if the cable shakes in the working process, the self-adapting component 6 can absorb the vibration energy;

[0048] As Figures 1-4 and Figure 7 shown, finally, when the joint 2 is connected with the downhole joint 2, the joint 2 pushes one end of the push rod 41, the push rod 41 slides in the through groove 3, and slides into the large U-shaped groove 421 through the small U-shaped groove 422, and then pushes the end of the L rod one 51 out of the large U-shaped groove 421 through the slope one 411 on the top of the push rod 41, so that the fixed block one 42 loses the restriction on the rotating rod 52, at this time, the rubber sleeve 571 loses the clamping force and appears to rebound to push the limiting rod one 57 to drive the limiting block one 551 and the limiting block two 561 and the limiting ring 53 to rotate, so that the limiting rod one 57 loosens the clamping of the cable main body 1, at this time, the limiting cylinder 54 slides downward to the middle of the joint 2 and the joint 2 through gravity, the L rod one 51 contacts the slope two 441 on the fixed block three 44, the slope two 441 pushes the L rod one 51 to move in the direction of the fixed block two 43, and contacts the fixed block two 43, in the process, the rotating rod 52 and the limiting ring 53 are driven to rotate in the opposite direction by the L rod one 51, and then the two ends of the joint 2 and the joint 2 are restricted again, so that the connection of the two is more stable.

[0049] Embodiments of the present application are given for example and description, although embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A scale-preventing downhole electric heating and temperature-pressure monitoring integrated cable for thick oil, comprising: The cable body (1) and the connector (2) disposed at the bottom of the cable body (1) are characterized in that: a slot (21) is provided on one side of the connector (2), a through groove (3) is provided at the insulation layer of the connector (2), a fixing component (4) is provided at the through groove (3) of the connector (2), a positioning component (5) is provided at the connection between the cable body (1) and the connector (2), and an adaptive component (6) is provided on the outside of the positioning component (5); The fixing component (4) includes a push rod (41) slidably connected in the through groove (3), the push rod (41) passing through the through groove (3), a fixing block one (42) is fixedly connected to the outside of the connector (2) at the top of the through groove (3), a fixing block two (43) is fixedly connected to the bottom of the fixing block one (42) on the connector (2), and a fixing block three (44) is fixedly connected to one side of the fixing block two (43) on the connector (2). The push rod (41) has a slope (411) at the top, a large groove (421) is provided on one side of the fixing block (42), a small groove (422) with the same size as the push rod (41) is provided at the bottom of the large groove (421), the fixing block (43) is L-shaped, and the fixing block (44) has a slope (441) on the side near the fixing block (43). The positioning component (5) includes an L-shaped rod (51) with one end connected to the large U-shaped groove (421). The short end of the L-shaped rod (51) is slidably connected to the large U-shaped groove (421). The long end of the L-shaped rod (51) is fixedly connected to a rotating rod (52). Both ends of the rotating rod (52) are rotatably connected to limit rings (53). The rotating rod (52) can only rotate 30° on the limit rings (53). Between the two limit rings (53) A rotatable connection is provided with a limiting cylinder (54). Two sets of limiting blocks (55) are respectively provided at both ends of the limiting cylinder (54). Two sets of limiting blocks (56) are respectively fixedly connected to the opposite sides of the two limiting rings (53). The two sets of limiting blocks (55) and the two sets of limiting blocks (56) are symmetrically distributed. A limiting rod (57) is provided through each set of limiting blocks (55) and each set of limiting blocks (56). The adaptive component (6) includes a second limiting rod (61) slidably connected to the limiting cylinder (54). The second limiting rod (61) has multiple limiting grooves (62). The second limiting rod (61) passes through the side wall of the limiting cylinder (54). A U-shaped block (63) is slidably connected to one end of the second limiting rod (61) away from the limiting cylinder (54). A spring (64) is fixedly connected between the limiting cylinder (54) and the U-shaped block (63). A roller (65) is rotatably connected in the U-shaped block (63).

2. The scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable for thickened oil wells according to claim 1, characterized in that: The side wall of the limiting cylinder (54) is provided with a square groove (541), the rotating rod (52) passes through the square groove (541), and the inner wall of the limiting cylinder (54) is fixedly connected with a locking block (542), which is slidably connected to the locking groove (21).

3. The scale-prevention type downhole electric heating and temperature-pressure monitoring integrated cable of claim 1, characterized in that: The set of limiting blocks (55) includes two limiting blocks (551), one of which is fixedly connected to the limiting cylinder (54), and the other is fixedly connected to the limiting ring (53). The two limiting blocks (551) are symmetrical about the axis. The second set of limiting blocks (56) includes two limiting blocks (561), one of which is fixedly connected to the limiting cylinder (54), and the other is fixedly connected to the limiting ring (53). The two limiting blocks (561) are symmetrical about the axis.

4. The integrated cable for anti-scaling heavy oil well electric heating and temperature and pressure monitoring as described in claim 3, characterized in that: A rubber sleeve (571) is fixedly connected to the middle of the limiting rod (57), and the connection between the limiting rod (57) and the limiting block (551) and the limiting block (561) on the limiting ring (53) retains rotation space.

5. The integrated cable for anti-scaling heavy oil well electric heating and temperature and pressure monitoring as described in claim 1, characterized in that: The limiting cylinder (54) has an L-groove (611) at the limiting rod two (61). The short side of the L-groove (611) is at the top of the limiting cylinder (54). An L-rod two (612) is slidably connected in the L-groove (611). Its diameter is the same as that of the limiting groove (62). A cylindrical block (613) is fixedly connected to one end of the limiting rod two (61) and the U-shaped block (63). Both ends of the U-shaped block (63) have a circular groove one (614) with the same diameter as the cylindrical block (613). The U-shaped block (63) has a circular groove two (615) with the same diameter as the limiting rod two (61) on one side of the circular groove one (614).

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