A sealer for oil well testing cables

Abstract

The utility model discloses a kind of sealers of oil well test cable, the sealer includes the test cable conveying section placed in oil well wellhead, its upper and lower end surface is connected inflatable seal section, upper is equipped with compressed gas pump, compressed gas pump is supplied with gas to inflatable seal section by gas pipe and branch pipe. Annular airbag of inflatable seal section expands and is closely contacted with wellhead side wall, sealing airbag expands and is closely contacted with the outer surface of test cable, realizes double seal. By electromagnetic valve control upper and lower sealing airbag alternately unsealing, test cable can be accumulated in annular frame when upper airbag contracts, lower airbag unsealing after upper airbag reseals, again with the rotation of servo motor driven rubber roller in test cable conveying section, test cable is straightened and lowered into oil well, guarantee the smooth progress of oil well test operation.

Description

Technical Field

[0001] This utility model relates to the field of cable seal technology, specifically to a seal for an oil well test cable. Background Technology

[0002] In oil well testing operations, accurately acquiring various parameters within the well is crucial for assessing its production status and formulating subsequent extraction strategies. The test cable, a key component for transmitting test signals and data, must extend deep into the well. During this process, gaps exist between the wellhead and the test cable. High-pressure oil, gas, and other liquids within the well can easily leak out through these gaps, leading not only to resource waste but also potential safety accidents such as fires and explosions, posing a serious threat to the lives of on-site personnel. Simultaneously, external impurities and moisture can also enter the well through these gaps, contaminating the well environment, affecting normal production, and reducing the well's operational lifespan.

[0003] Furthermore, during the lowering process, the test cable is prone to entanglement and jamming due to the complexity of the wellhead environment and the inherent characteristics of the cable itself. This can prevent the cable from being successfully lowered to the designated location, affecting the normal progress of testing and increasing operation time and costs. Existing oil well test cable sealing devices are mostly single-function devices, only providing simple sealing to the wellhead or the test cable. They cannot simultaneously solve the dual sealing problem of the wellhead and the test cable, nor can they address the difficulty of lowering the test cable, thus failing to meet the needs of actual production. Therefore, developing an oil well test cable sealer that can effectively solve the above problems is of significant practical importance. Utility Model Content

[0004] The purpose of this utility model is to provide a technical solution for a sealing device of an oil well test cable, so as to solve the shortcomings mentioned in the background art. To address the drawbacks and defects described in the background art, this technical solution includes the following:

[0005] The device includes a test cable delivery section positioned at the wellhead of an oil well. Inflatable sealing sections are fixedly connected to both the upper and lower ends of the test cable delivery section. A compressed air pump is installed above the test cable delivery section and the inflatable sealing sections. A gas delivery pipe is connected to the compressed gas release port of the compressed air pump, and a branch pipe is connected through the side wall of the gas delivery pipe.

[0006] The test cable delivery section includes an annular frame, three sets of servo motors fixedly connected in a ring array to the inner side wall of the annular frame, and rubber rollers connected to the output shaft of the servo motors via couplings.

[0007] Each of the inflatable sealing joints includes a support tube fixed to the upper and lower end faces of the annular frame, a sealing airbag fixed in the inner cavity of the support tube, and 10-16 annular airbags fixed in a linear array on the outer surface of the support tube.

[0008] The end of the gas supply pipe passes through all the annular airbags, and the end of the branch pipe passes into the interior of the upper sealing airbag.

[0009] As a preferred embodiment of this utility model: three fixing rods are fixed in a ring array on the inner cavity sidewall of the annular frame, and the ends of the fixing rods are respectively fixedly connected to the outer sidewall of the servo motor.

[0010] As a preferred embodiment of this utility model: a groove is provided on the outer surface of each rubber roller, and the side of the rubber rollers that are close to each other forms a space for the test cable to pass through, and the side of the rubber rollers that are close to each other is in contact with the outer surface of the test cable.

[0011] As a preferred embodiment of this utility model: an electromagnetic valve is fixed in the inner cavity of the annular frame, and the upper and lower ports of the electromagnetic valve are connected to connecting pipes through connectors, with the end of the connecting pipe away from the electromagnetic valve penetrating into the inner cavities of the upper and lower sealing airbags respectively.

[0012] As a preferred embodiment of this utility model: the outer surface of the annular airbag away from the support pipe is in close contact with the side wall of the oil wellhead, and the annular airbag is provided with a through hole for the gas delivery pipe to pass through, and the internal gap of the through hole is filled with sealant.

[0013] As a preferred embodiment of this utility model: the inner sidewall of the sealing airbag is in close contact with the outer surface of the oil well test cable, and the sealing airbags are provided with circular holes for connecting pipes to pass through on the sides that are close to each other. The top surface of the upper sealing airbag is provided with circular holes for branch pipes to pass through. The gaps inside the circular holes are sealed with sealant.

[0014] As a preferred embodiment of this utility model: multiple air delivery holes are provided on the outer surface of the air delivery pipe, and the air delivery holes are respectively connected to the inner cavity space of the annular airbag.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] The sealing device of this oil well test cable uses two inflatable sealing sections to effectively seal both the wellhead gaps and the test cable, preventing leakage of materials from the well and the entry of external impurities, thus ensuring operational safety and testing accuracy. An electromagnetic valve controls the alternating operation of the upper and lower sealing airbags. When the upper airbag contracts, the cable can accumulate within the annular frame. After the upper airbag re-seals, the lower airbag releases its seal. In conjunction with the servo motor of the test cable delivery section, which drives the rubber rollers, the cable is smoothly guided down into the oil well, avoiding problems such as tangling and jamming during the lowering process, improving lowering efficiency and stability. Furthermore, the tight contact between the annular airbag and the sealing airbag and their corresponding parts, as well as the sealing of the through-hole gaps, further enhances the sealing effect, ensuring reliable operation of the entire device in complex oil well environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the test cable sealer;

[0019] Figure 2 This is an exploded view of the test cable seal.

[0020] Figure 3 This is a schematic diagram of an inflatable sealing joint;

[0021] Figure 4 This is a schematic diagram of a test cable transport section;

[0022] Figure 5 This is a schematic diagram of a compressed air pump and air delivery pipes.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Test cable conveyor section; 101. Annular frame; 102. Fixing rod; 103. Rubber roller; 104. Connecting pipe; 105. Solenoid valve; 106. Servo motor; 2. Inflatable sealing section; 201. Support pipe; 202. Annular airbag; 203. Sealing airbag; 3. Compressed air pump; 4. Air supply pipe; 5. Branch pipe. Detailed Implementation

[0025] To provide a clearer explanation and illustration of the technical solution and implementation of this utility model, several preferred specific embodiments for implementing the technical solution of this utility model are described below. The following description is merely exemplary and not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these drawings, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically illustrate the concept and principle of the embodiments of this disclosure and do not necessarily show the specific dimensions and proportions of the various embodiments of this disclosure. The technical solution of this utility model will be clearly and completely described below in conjunction with embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model.

[0026] Example 1: A seal for an oil well test cable includes a test cable delivery section 1 placed at the wellhead of the oil well. Inflatable sealing sections 2 are fixedly connected to both the upper and lower ends of the test cable delivery section 1. A compressed air pump 3 is installed above it, and the compressed gas release port of the compressed air pump 3 is connected to a gas delivery pipe 4. A branch pipe 5 is connected through the side wall of the gas delivery pipe 4. Three fixing rods 102 are fixed in a ring array on the inner wall of the annular frame 101 of the test cable delivery section 1. The ends of the fixing rods 102 are fixedly connected to the outer walls of three sets of servo motors 106, which are also fixed in a ring array on the inner wall of the annular frame 101. A rubber roller 103 is connected to the output shaft of the servo motor 106 via a coupling. The outer surface of the rubber roller 103 has a groove, which forms a space for the test cable to pass through and contacts the outer surface of the test cable. The inner cavity of the annular frame 101 is fixed with an electromagnetic valve 105. Its upper and lower ports are connected to a connecting pipe 104 through a connector. The end of the connecting pipe 104 away from the electromagnetic valve 105 passes through the inner cavities of the upper and lower sealing airbags 203 respectively.

[0027] The support tube 201 of the inflatable sealing joint 2 is fixed to the upper and lower end faces of the annular frame 101. The sealing airbag 203 is fixed in the inner cavity of the support tube 201. Ten annular airbags 202 are fixed in a linear array on the outer surface of the support tube 201. The outer surface of the annular airbag 202 away from the support tube 201 is in close contact with the sidewall of the wellhead. It has a through hole for the gas delivery pipe 4 to pass through, and the internal gap is filled with sealant. The inner sidewall of the sealing airbag 203 is in close contact with the outer surface of the well test cable. A circular hole for the connecting pipe 104 to pass through is opened on the side close to each other. A circular hole for the branch pipe 5 to pass through is set on the top surface of the upper sealing airbag 203. The internal gap of the circular hole is sealed with sealant. The end of the gas delivery pipe 4 passes through all the annular airbags 202. Multiple gas delivery holes are opened on the outer surface and communicate with the inner cavity of the annular airbag 202. The end of the branch pipe 5 passes into the interior of the upper sealing airbag 203. During operation, the compressed air pump 3 inflates the annular airbag 202 and the upper sealing airbag 203 through the air supply pipe 4 and the branch pipe 5 to seal the gaps at the wellhead and the test cable. When it is necessary to straighten the cable, the solenoid valve 105 controls the upper sealing airbag 203 to contract, releasing the seal on the cable. The cable accumulates below inside the annular frame 101. After the upper sealing airbag 203 re-expands and seals, the lower sealing airbag 203 releases the compression seal on the test cable. The servo motor 106 drives the rubber roller 103 to rotate, straightening the cable downwards into the well.

[0028] Example 2: A sealer for an oil well test cable, with a structure basically the same as in Example 1, except that the number of annular airbags 202 fixed to the outer surface of the support pipe 201 in the inflatable sealing section 2 is 13. In use, the compressed air pump 3 is started, and gas enters the annular airbag 202 and the upper sealing airbag 203 through the gas supply pipe 4 and branch pipe 5 respectively. The annular airbag 202 expands and makes tight contact with the sidewall of the oil wellhead, and the sealing airbag 203 expands and makes tight contact with the outer surface of the test cable, completing the seal. When the cable is straightened, the solenoid valve 105 is activated, causing the upper sealing airbag 203 to contract first, and the cable accumulates inside the annular frame 101. Then, the upper sealing airbag 203 expands again to seal, the lower sealing airbag 203 contracts, and the servo motor 106 drives the rubber roller 103 to rotate, smoothly lowering the cable into the oil well.

[0029] Example 3: A sealer for an oil well test cable, also comprising a test cable delivery section 1 and an inflatable sealing section 2, wherein 16 annular airbags 202 are fixed to the outer surface of the support pipe 201 of the inflatable sealing section 2. During the sealing process, a compressed air pump 3 delivers compressed gas through an air supply pipe 4 and a branch pipe 5 to the annular airbags 202 and the upper sealing airbag 203 to achieve the sealing function. When the cable position needs to be adjusted, the solenoid valve 105 controls the upper and lower sealing airbags 203 to work alternately. First, the upper sealing airbag 203 contracts, and the cable forms a certain accumulation within the annular frame 101. After the upper sealing airbag 203 re-seals, the lower sealing airbag 203 contracts, and the servo motor 106 drives the rubber roller 103 to rotate, straightening the cable and lowering it into the oil well.

[0030] Based on the above-described preferred technical solution, the workflow of this technical solution is explained as follows: First, the compressed air pump 3 starts to generate compressed gas. The compressed gas enters the gas delivery pipe 4 through the compressed gas release port of the compressed air pump 3. A portion of the gas is delivered to the upper sealing airbag 203 through the branch pipe 5 connected to the side wall of the gas delivery pipe 4. At the same time, another portion of the gas is delivered to each annular airbag 202 through the gas delivery pipe 4. Since the outer surface of the gas delivery pipe 4 has multiple gas delivery holes that are connected to the inner cavity of the annular airbag 202, the gas expands after entering the annular airbag 202, causing the annular airbag 202 to move away from the support pipe 201. The outer surface is in close contact with the sidewall of the oil wellhead, achieving a seal on the gaps in the oil wellhead. The gas entering the upper sealing airbag 203 causes it to expand, and the inner sidewall of the upper sealing airbag 203 is in close contact with the outer surface of the oil well test cable, achieving a seal on the top of the test cable. At the same time, the electromagnetic valve 105 is in its initial state, and its upper and lower ports are connected to the upper and lower sealing airbags 203 and the electromagnetic valve 105 through the connecting pipe 104 connected by the connector. At this time, the lower sealing airbag 203 is also in an expanded state, and its inner sidewall is in close contact with the outer surface of the oil well test cable, further strengthening the seal on the test cable.

[0031] When the test cable needs to be lowered into the oil well, the solenoid valve 105 activates, changing the gas flow path. This allows the gas in the upper sealing bladder 203 to be discharged through the connecting pipe 104 and the solenoid valve 105. The upper sealing bladder 203 contracts, releasing the seal on the top of the test cable. Under the influence of gravity, the test cable accumulates below inside the annular frame 101. At this time, the lower sealing bladder 203 remains inflated, sealing the test cable. After a certain amount of test cable has accumulated below, the solenoid valve 105 activates again, causing the upper sealing bladder 203 to re-inflate and re-seal the outer surface of the oil well test cable. Afterward, the gas in the lower sealing bladder 203 flows through the connecting pipe 104 and the solenoid valve 105. When the pipe 104 and the solenoid valve 105 discharge, the lower sealing airbag 203 contracts, releasing the compression seal on the test cable; at this time, the three sets of servo motors 106 in the test cable conveyor section 1 start, and the output shaft of the servo motor 106 drives the rubber roller 103 to rotate through the coupling. A groove on the outer surface of the rubber roller 103 and the adjacent sides form a space for the test cable to pass through, and the adjacent sides of the rubber roller 103 contact the outer surface of the test cable. During the rotation of the rubber roller 103, the test cable accumulated inside the annular frame 101 is straightened and lowered into the oil well. This cycle is repeated to achieve continuous lowering of the test cable and continuous sealing of the oil wellhead and the test cable.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A seal for an oil well test cable, comprising a test cable delivery section (1) positioned at the wellhead of the oil well, characterized in that: The upper and lower end faces of the test cable conveyor section (1) are fixedly connected to inflatable sealing sections (2). A compressed air pump (3) is installed above the test cable conveyor section (1) and the inflatable sealing section (2). The compressed gas release port of the compressed air pump (3) is connected to an air supply pipe (4). A branch pipe (5) is connected through the side wall of the air supply pipe (4). The test cable transport section (1) includes an annular frame (101), three sets of servo motors (106) fixedly connected in an annular array to the inner side wall of the annular frame (101), and rubber rollers (103) connected to the output shaft of the servo motors (106) via a coupling. Each of the inflatable sealing sections (2) includes a support tube (201) fixed to the upper and lower end faces of the annular frame (101), a sealing airbag (203) fixed in the inner cavity of the support tube (201), and 10-16 annular airbags (202) fixed in a linear array on the outer surface of the support tube (201). The end of the gas supply pipe (4) passes through all the annular airbags (202), and the end of the branch pipe (5) passes into the interior of the upper sealing airbag (203).

2. The seal for an oil well test cable according to claim 1, characterized in that: The inner cavity sidewall of the ring frame (101) is fixed with three fixing rods (102) in a ring array. The ends of the fixing rods (102) are fixedly connected to the outer sidewall of the servo motor (106).

3. The seal for an oil well test cable according to claim 1, characterized in that: Each of the rubber rollers (103) has a groove on its outer surface. The side of the rubber rollers (103) that are close to each other forms a space for the test cable to pass through, and the side of the rubber rollers (103) that are close to each other is in contact with the outer surface of the test cable.

4. The seal for an oil well test cable according to claim 1, characterized in that: An electromagnetic valve (105) is fixed in the inner cavity of the annular frame (101). Both the upper and lower ports of the electromagnetic valve (105) are connected to a connecting pipe (104) through a connector, and the end of the connecting pipe (104) away from the electromagnetic valve (105) passes through the inner cavities of the upper and lower sealing airbags (203).

5. The seal for an oil well test cable according to claim 1, characterized in that: The outer surface of the annular airbag (202) away from the support pipe (201) is in close contact with the side wall of the wellhead. The annular airbag (202) is provided with a through hole for the gas supply pipe (4) to pass through, and the internal gaps of the through hole are filled with sealant.

6. The seal for an oil well test cable according to claim 1, characterized in that: The inner sidewall of the sealing airbag (203) is in close contact with the outer surface of the oil well test cable. The sealing airbags (203) are provided with round holes for the connecting pipe (104) to pass through on the side that is close to each other. The top surface of the upper sealing airbag (203) is provided with round holes for the branch pipe (5) to pass through. The gaps inside the round holes are sealed with sealant.

7. The seal for an oil well test cable according to claim 1, characterized in that: The outer surface of the gas pipe (4) is provided with multiple gas delivery holes, and the gas delivery holes are respectively connected to the inner cavity space of the annular airbag (202).

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