A space anti-freezing pressure detection device and method

Abstract

The present application relates to the field of oil and gas pipeline testing, in particular to a kind of annular space anti-freezing pressure detection device and detection method, the present application is provided with oil pipe, casing, guide elbow, probe cable, detection probe, connecting base, anti-collision ring, connecting frame and anti-collision air bag, the buffering effect of anti-collision soft pad reduces the vibration generated when anti-collision ring and oil pipe and casing collide, the elastic buffer effect of elastic connecting piece is generated, the damping effect of elastic support is improved, when using, anti-collision ring is fixed by connecting base, detection probe is protected by the anti-collision structure formed by anti-collision ring, connecting frame and anti-collision air bag, to prevent detection probe from colliding and contacting with oil pipe and casing during moving in annular space, prevent detection probe from being damaged during moving, avoid detection abnormal caused by detection probe and oil pipe and casing contact, improve the accuracy of detection data.

Description

Technical Field

[0001] This invention relates to the field of oil and gas pipeline testing, specifically to a ring-shaped space antifreeze pressure testing device and testing method. Background Technology

[0002] The annular space in an oil well refers to the annular area between the casing and the tubing or other tubing strings. It is formed by the inner diameter of the casing and the outer diameter of the tubing and is usually used to maintain the pressure difference between the inside and outside of the tubing. The annular space is filled with a pressure-stabilizing medium. To ensure stable operation of oil wells, it is necessary to regularly check the casing pressure within the annulus space. In northern regions, especially during cold winters, the surface medium is prone to morphological changes due to low temperatures, which can affect the accuracy of the testing device and prevent it from accurately measuring the pressure within the annulus space. Traditional antifreeze methods typically involve lowering the testing probe of the device into the lower layer of the annulus space. Since the probe is connected to the testing instrument via a cable, it is prone to contact and collision with the casing or tubing when moving within the pipeline. This contact can lead to inaccurate measurement data. Therefore, a device and method for detecting the antifreeze pressure of the annulus space are proposed. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a ring-shaped space antifreeze pressure detection device and detection method.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a ring-shaped space antifreeze pressure detection device and detection method, comprising a fixed tube, a guide bend, a probe cable, a detection probe, a connecting base, an anti-collision ring, a connecting frame, and an anti-collision airbag; The fixing tube is located on the outside of the sleeve, and passes through the sleeve and communicates with the annular space; The guide bend is inserted into the inside of the fixed tube; One end of the probe cable passes through both the fixed tube and the guide bend tube and enters the annular space. The detection probe is installed at the end of the probe cable; The connecting base is located at the junction of the probe cable and the detection probe; Several sets of anti-collision rings are distributed around the outside of the connecting base; The connecting frame is disposed at the bottom of the connecting base; Several sets of the aforementioned anti-collision airbags are distributed around the bottom of the connecting frame.

[0005] Preferably, one end of the probe cable is connected to an external testing instrument, and the other end of the probe cable is connected to a testing probe.

[0006] Preferably, the connecting base includes a base body and a base connecting ring. The base body is fitted onto the outside of the probe cable. Two sets of base bodies are spliced ​​together to form an arc shape, and two sets of base connecting rings are respectively located on both sides of the base body.

[0007] Preferably, the anti-collision ring includes an elastic bracket and an anti-collision pad. The elastic bracket is connected to the outside of the base body, and the anti-collision pad is wrapped around the outside of the elastic bracket. The elastic bracket includes a bracket ring and an elastic connecting piece. The bracket ring is disposed inside the anti-collision pad, and two sets of elastic connecting pieces are symmetrically disposed between the bracket ring and the base body.

[0008] Preferably, the connecting frame includes a vertical rod, an anti-tilt rod, a fixing ring, and a support beam. The top end of the vertical rod is connected to the bottom of the bracket ring, the top end of the anti-tilt rod is connected to the bottom of the base body, and the bottom end of the anti-tilt rod is connected to the inner side of the vertical rod. Several sets of fixing rings are arranged on the inner side of the vertical rod, and the fixing rings connect several sets of vertical rods in series. The support beam is arranged on the inner side of the bottom of the vertical rod, and the support beam is arranged in a cross-shaped staggered structure.

[0009] Preferably, the anti-collision airbag includes an airbag base, an airbag body, and connecting screws. The airbag base is connected to the bottom end of the vertical rod by the connecting screws, and the airbag body is wrapped around the outside of the airbag base.

[0010] Preferably, the counterweight device includes a plumb block, a connecting screw, and a connecting nut. The plumb block is located at the center of the bottom of the support beam, and the connecting screw is located at the center of the top of the plumb block. The connecting screw passes through the support beam and is fixed to the connecting nut.

[0011] A method for detecting the antifreeze pressure of a ring-shaped space includes the following steps: Acquire sensing information, wherein the sensing information includes pressure sensing information; The pressure sensing information is sorted and calculated based on the time series to determine the rate of change and extreme values ​​of the pressure sensing information. Construct a change matrix based on the extreme values ​​of change and the rate of change; The correlation of the change matrix is ​​calculated, and if the correlation value is within a preset range, the pressure sensing information is determined to be normal; otherwise, it is determined to be abnormal.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention comprises an oil pipe, casing, guide bend, probe cable, detection probe, connecting base, anti-collision rings, connecting frame, and anti-collision airbags. The connecting base is located at the junction of the probe cable and the detection probe, and is fitted over the probe cable. Several sets of anti-collision rings are distributed around the outside of the connecting base. The connecting frame is located at the bottom of the connecting base, and several sets of anti-collision airbags are distributed around the bottom of the connecting frame. The anti-collision pads reduce the vibration generated when the anti-collision rings collide with the oil pipe and casing. The elasticity of the elastic connecting piece provides a buffering effect, improving the shock absorption effect of the elastic support. The anti-tilt bar provides cushioning for the vertical rod. Side support reinforcement prevents the vertical rod from colliding with the detection probe. The vertical rod is supported by a fixing ring to prevent deformation caused by impact. The bottom of the vertical rod is supported and fixed by a support beam to improve the seismic resistance of the vertical rod. During use, the anti-collision ring is fixed by the connecting base. The anti-collision structure composed of the anti-collision ring, connecting frame and anti-collision airbag protects the detection probe and prevents it from colliding with the oil pipe and casing during the movement of the detection probe in the ring space. This prevents damage to the detection probe during movement and avoids detection abnormalities caused by contact between the detection probe and the oil pipe and casing, thus improving the accuracy of the detection data. 2. This invention also includes a guide bend, which is inserted into the fixed tube. The guide bend is designed with a curved shape. When releasing the probe cable, the guide bend guides and limits the travel path of the probe cable, causing the probe cable to move vertically downward. The counterweight device includes a plumb block, a connecting screw, and a connecting nut. The plumb block is located at the center of the bottom of the support beam, and the connecting screw is located at the center of the top of the plumb block. The connecting screw passes through the support beam and is fixed to the connecting nut. The gravity of the plumb block keeps the connecting frame vertical during movement, reducing the shaking of the detection probe enclosed inside the connecting frame during movement. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the overall structure of the anti-collision mechanism of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the anti-collision mechanism of the present invention; Figure 5 This is a schematic diagram of the top structure of the anti-collision ring of the present invention; Figure 6 This is a schematic diagram of the unfolded structure of the anti-collision ring of the present invention; Figure 7This is a schematic diagram of the bottom structure of the connecting frame of the present invention; Figure 8 This is a schematic diagram of the anti-collision airbag deployment structure of the present invention; Figure 9 This is a schematic diagram of the unfolded structure of the counterweight device of the present invention.

[0014] The numbers in the image represent: 1. Fixed tube; 2. Guide bend; 3. Probe cable; 4. Detection probe; 5. Connecting base; 51. Base body; 52. Base connecting ring; 6. Anti-collision ring; 61. Elastic bracket; 611. Bracket ring; 612. Elastic connecting piece; 62. Anti-collision pad; 7. Connecting frame; 71. Vertical rod; 72. Anti-tilt rod; 73. Fixed ring; 74. Support beam; 8. Anti-collision airbag; 81. Airbag base; 82. Airbag body; 83. Connecting screw; 9. Counterweight device; 91. Plumb bob; 92. Connecting screw; 93. Connecting nut. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0016] Example 1 like Figure 1 - Figure 9 As shown, the present invention provides a ring-shaped space antifreeze pressure detection device and detection method, including a fixed tube 1, a guide bend 2, a probe cable 3, a detection probe 4, a connecting base 5, an anti-collision ring 6, a connecting frame 7, and an anti-collision airbag 8. The fixing tube 1 is located on the outside of the sleeve, and the fixing tube 1 passes through the sleeve and is connected to the annular space; The guide bend 2 is inserted into the fixed tube 1; One end of the probe cable 3 passes through both the fixed tube 1 and the guide bend 2 and enters the annular space. The detection probe 4 is installed at the end of the probe cable 3; The connecting base 5 is located at the junction of the probe cable 3 and the detection probe 4; Several sets of anti-collision rings 6 are distributed around the outside of the connecting base 5; The connecting bracket 7 is located at the bottom of the connecting base 5; Several sets of anti-collision airbags 8 are set around the bottom of the connecting frame 7.

[0017] During use, the anti-collision ring 6 is fixed by the connecting base 5. The anti-collision structure composed of the anti-collision ring 6, the connecting frame 7, and the anti-collision airbag 8 protects the detection probe 4, preventing the detection probe 4 from colliding and contacting the oil pipe and casing during its movement within the ring space, preventing damage to the detection probe 4 during movement, avoiding detection abnormalities caused by contact between the detection probe 4 and the oil pipe and casing, and improving the accuracy of the detection data.

[0018] One end of the probe cable 3 is connected to an external testing instrument, and the other end of the probe cable 3 is connected to the testing probe 4. When the probe cable 3 is released, the guide bend 2 guides and limits the travel path of the probe cable 3, so that the probe cable 3 moves in a vertically downward direction.

[0019] The connecting base 5 includes a base body 51 and a base connecting ring 52. The base body 51 is fitted onto the outside of the probe cable 3. The two sets of base bodies 51 are spliced ​​together to form an arc shape. The two sets of base connecting rings 52 are respectively located on both sides of the base body 51. The two sets of base connecting rings 52 are connected by bolts and screws to splice and fix the two sets of base bodies 51 onto the outside of the probe cable 3.

[0020] The anti-collision ring 6 includes an elastic bracket 61 and an anti-collision pad 62. The elastic bracket 61 is connected to the outside of the base body 51, and the anti-collision pad 62 is wrapped around the outside of the elastic bracket 61. During the descent of the detection probe 4 inside the ring space, the anti-collision pad 62 reduces the vibration generated when the anti-collision ring 6 collides with the oil pipe and casing. The elastic bracket 61 includes a bracket ring plate 611 and an elastic connecting plate 612. The bracket ring plate 611 is located inside the anti-collision pad 62, and two sets of elastic connecting plates 612 are symmetrically arranged between the bracket ring plate 611 and the base body 51. The elasticity of the elastic connecting plate 612 generates a buffering effect, improving the shock absorption effect of the elastic bracket 61.

[0021] The connecting frame 7 includes a vertical rod 71, an anti-tilt rod 72, a fixing ring 73, and a support beam 74. The top of the vertical rod 71 is connected to the bottom of the bracket ring 611, the top of the anti-tilt rod 72 is connected to the bottom of the base body 51, and the bottom of the anti-tilt rod 72 is connected to the inner side of the vertical rod 71. Several sets of fixing rings 73 are set on the inner side of the vertical rod 71, and the fixing rings 73 connect several sets of vertical rods 71 ​​in series. The support beam 74 is set on the inner side of the bottom of the vertical rod 71 and is set as a cross-shaped staggered structure. The anti-tilt rod 72 supports and reinforces the inner side of the vertical rod 71 to prevent the vertical rod 71 from contacting and colliding with the detection probe 4. The fixing ring 73 supports the vertical rod 71 to prevent the vertical rod 71 from deforming due to collision. The support beam 74 supports and fixes the bottom of the vertical rod 71 to improve the seismic resistance of the vertical rod 71.

[0022] The anti-collision airbag 8 includes an airbag base 81, an airbag body 82, and a connecting screw 83. The airbag base 81 is connected to the bottom of the vertical rod 71 by the connecting screw 83. The airbag body 82 is wrapped around the outside of the airbag base 81. The airbag body 82 prevents the bottom of the vertical rod 71 from directly colliding with the oil pipe and casing, and reduces the impact force on the vertical rod 71 when it comes into contact with the oil pipe and casing.

[0023] The counterweight device 9 includes a plumb block 91, a connecting screw 92, and a connecting nut 93. The plumb block 91 is located at the bottom center of the support beam 74, and the connecting screw 92 is located at the top center of the plumb block 91. The connecting screw 92 passes through the support beam 74 and is fixed to the connecting nut 93. The gravity of the plumb block 91 keeps the connecting frame 7 vertical during movement, reducing the shaking of the detection probe 4 enclosed inside the connecting frame 7 during movement.

[0024] Instructions for using the ring-shaped space antifreeze pressure detection device: Install the fixing tube 1 on the side of the sleeve; install the guide bend 2 inside the fixing tube 1, making the end of the guide bend 2 vertically downward; connect one end of the probe cable 3 to the detection instrument; pass the other end of the probe cable 3 through the guide bend 2; fix the detection probe 4 to the end of the probe cable 3; after splicing the two sets of base bodies 51, fit them onto the outside of the probe cable 3, adjust the position of the base body 51 so that the base body 51 is set at the junction of the probe cable 3 and the detection probe 4; install bolts in the base connecting ring 52 to connect and fix the two sets of base bodies 51; fix one side of the elastic connecting piece 612 to the outside of the base body 51 with screws; fix the anti-collision soft pad 62 to the outside of the bracket ring piece 611, and fix the bracket with screws. The ring plate 611 is fixed to the outside of the elastic connecting plate 612; the top of the vertical rod 71 is connected to the bottom of the bracket ring plate 611, the top of the anti-tilt rod 72 is connected to the bottom of the base body 51, and the bottom of the anti-tilt rod 72 is fixed to the inside of the vertical rod 71; the airbag body 82 is fitted onto the outside of the airbag base 81, and the airbag base 81 is fixed to the bottom of the vertical rod 71 by the connecting screw 83; the plumb block 91 is fixed to the center position of the bottom of the support beam 74 by the connecting screw 92 and the connecting nut 93; the length of the probe cable 3 in the annular space formed between the casing and the oil pipe is adjusted so that the detection probe 4 is at the height position required for detection; the detection instrument connected to the probe cable 3 is started to detect the environment in the annular space.

[0025] Example 2 A method for detecting the antifreeze pressure of a ring-shaped space includes: Step S101: Obtain sensing information, wherein the sensing information includes pressure sensing information; Step S102: Sort and calculate the pressure sensing information based on the time series to determine the rate of change and extreme values ​​of the pressure sensing information; Step S103: Construct a change matrix based on the extreme values ​​of change and the rate of change; Step S104: Perform correlation calculation on the change matrix, and determine that the pressure sensing information is normal when the correlation value is within a preset range; otherwise, determine that it is abnormal.

[0026] In this embodiment, the pressure signal transmitted back by the detection probe 4 is received in real time, and the temperature of the medium in the ring space is monitored by the temperature sensor to determine whether the pressure is abnormal due to low temperature freezing. If a sudden pressure increase is detected (possibly due to ice expansion), the detection is stopped immediately and the pressure relief valve or heating device (such as electric heat tracing) is activated. If the pressure continues to drop (possibly due to leakage), the leakage location is marked and the seal is repaired.

[0027] Specifically, the system receives the pressure signal transmitted from the detection probe 4 in real time via probe cable 3, and simultaneously records temperature data (if the detection probe integrates a temperature sensor). High-frequency noise (such as collision and vibration interference) is then filtered out, retaining the valid pressure signal. Data is also marked according to timestamps to ensure alignment with the time series. The pressure data is then arranged chronologically, and the pressure difference between adjacent time points is calculated to generate a pressure change rate sequence. Pressure extreme values ​​are extracted and their occurrence times are recorded. The pressure change rate and extreme values ​​are then integrated into a matrix for multi-dimensional analysis. The correlation coefficient between the pressure change rate and temperature data is calculated. If the correlation coefficient is <0.3 and the difference between pressure extreme values ​​is less than a preset threshold, the pressure is considered normal. If the maximum pressure value rises sharply and is unrelated to temperature, it indicates a risk of icing expansion. If the pressure continues to decrease and the correlation value is approximately 0, a leak is identified.

[0028] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A ring-shaped space antifreeze pressure detection device, characterized in that, Includes a fixed tube (1), a guide bend (2), a probe cable (3), a detection probe (4), a connecting base (5), an anti-collision ring (6), a connecting frame (7), and an anti-collision airbag (8); The fixing tube (1) is located on the outside of the sleeve, and the fixing tube (1) passes through the sleeve and is connected to the annular space; The guide bend (2) is inserted into the fixed tube (1); The probe cable (3) is provided with one end passing through both the fixed tube (1) and the guide bend (2) to enter the ring space; The detection probe (4) is installed at the end of the probe cable (3); The connecting base (5) is located at the junction of the probe cable (3) and the detection probe (4); Several sets of anti-collision rings (6) are distributed around the outside of the connecting base (5); The connecting frame (7) is disposed at the bottom of the connecting base (5); Several sets of the aforementioned anti-collision airbags (8) are disposed around the bottom of the connecting frame (7).

2. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, One end of the probe cable (3) is connected to an external testing instrument, and the other end of the probe cable (3) is connected to the testing probe (4).

3. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, The connecting base (5) includes a base body (51) and a base connecting ring (52). The base body (51) is fitted onto the outside of the probe cable (3). The two sets of base bodies (51) are spliced ​​together to form an arc shape. The two sets of base connecting rings (52) are respectively located on both sides of the base body (51).

4. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, The anti-collision ring (6) includes an elastic bracket (61) and an anti-collision pad (62). The elastic bracket (61) is connected to the outside of the base body (51). The anti-collision pad (62) is wrapped around the outside of the elastic bracket (61). The elastic bracket (61) includes a bracket ring (611) and an elastic connecting piece (612). The bracket ring (611) is located inside the anti-collision pad (62). Two sets of elastic connecting pieces (612) are symmetrically arranged between the bracket ring (611) and the base body (51).

5. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, The connecting frame (7) includes a vertical rod (71), an anti-tilt rod (72), a fixing ring (73), and a support beam (74). The top end of the vertical rod (71) is connected to the bottom of the bracket ring (611). The top end of the anti-tilt rod (72) is connected to the bottom of the base body (51). The bottom end of the anti-tilt rod (72) is connected to the inner side of the vertical rod (71). Several sets of fixing rings (73) are arranged inside the vertical rod (71). The fixing rings (73) connect several sets of vertical rods (71) in series. The support beam (74) is arranged inside the bottom of the vertical rod (71). The support beam (74) is arranged in a cross-shaped staggered structure.

6. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, The anti-collision airbag (8) includes an airbag base (81), an airbag body (82) and a connecting screw (83). The airbag base (81) is connected to the bottom of the vertical rod (71) by the connecting screw (83), and the airbag body (82) is wrapped around the outside of the airbag base (81).

7. The ring-shaped space antifreeze pressure detection device as described in claim 1, characterized in that, The connecting frame (7) is provided with a counterweight device (9) at the bottom center position. The counterweight device (9) includes a plumb block (91), a connecting screw (92) and a connecting nut (93). The plumb block (91) is located at the bottom center position of the support beam (74). The connecting screw (92) is located at the top center position of the plumb block (91). The connecting screw (92) passes through the support beam (74) and is fixed with the connecting nut (93).

8. A method for detecting the antifreeze pressure of a ring-shaped space, applied to the antifreeze pressure detection device for a ring-shaped space as described in any one of claims 1-7, characterized in that: include: Acquire sensing information, wherein the sensing information includes pressure sensing information; The pressure sensing information is sorted and calculated based on the time series to determine the rate of change and extreme values ​​of the pressure sensing information. Construct a change matrix based on the extreme values ​​of change and the rate of change; The correlation of the change matrix is ​​calculated, and if the correlation value is within a preset range, the pressure sensing information is determined to be normal; otherwise, it is determined to be abnormal.

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