Anti-freezing oil-water well casing pressure detection device

Abstract

The invention discloses an anti-freezing oil-water well casing pressure detection device, and the device comprises a pipeline joint which is disposed at one side of a wellhead large four-way joint of an oil-water well; the pressure detection instrument is arranged on the pipeline joint; the probe is arranged in a loop space formed by a casing pipe and an oil pipe of the oil-water well and is positioned below the anti-freezing layer; the probe is in communication connection with the pressure detection instrument through an armored cable; the guide pipe is of an L-shaped structure arranged outside the armored cable in a sleeving mode, an opening with the two ends communicated is formed in one side of the guide pipe, the horizontal portion of the guide pipe is horizontally located in the pipeline connector, and the vertical portion of the guide pipe is vertically located in an annular space formed by a sleeve of the oil-water well and an oil pipe. According to the invention, the pressure detection probe is located 2 meters below the ground, so that the technical defect that the actual sleeve pressure value cannot be accurately obtained due to freezing of the sleeve space in cold weather is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield production wellhead devices, and more specifically, to an antifreeze type oil and water well casing pressure detection device. Background Art

[0002] Pressure detection in the annular space between the tubing and casing is an important technology in the oil exploration and production process. This technology usually relies on a pressure gauge installed at the casing gate of the oil tree. The pressure gauge is connected to the annular space between the tubing and casing. Its reading can reflect the pressure of the annular space and the amount of natural gas separated from the oil. In the normal production process of the oil well, the casing pressure is usually basically stable, so this pressure detection is crucial for monitoring the status of the oil well and ensuring production safety.

[0003] However, in the northeast region (such as Daqing), the extremely low temperature in winter makes it easy to freeze, which brings great challenges to the pressure detection of the annular space between the tubing and the casing. The probe is in the annular space before freezing, and as the ice layer thickens, the probe is frozen, making it impossible to accurately measure the pressure of the annular space.

[0004] Therefore, how to ensure real-time and accurate collection of the actual casing pressure value of the annulus space when the pressure detection probe is frozen in cold weather is a technical problem that needs to be urgently solved in oil fields in high-altitude and cold regions. Summary of the invention

[0005] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0006] Another object of the present invention is to provide an antifreeze type oil and water well casing pressure detection device, which, by locating the pressure detection probe 2 meters below the ground, avoids the technical defect that the solid-liquid mixture in the annulus space blocks the pressure port, or the annulus space freezes due to cold weather, resulting in the inability to accurately obtain the actual casing pressure value.

[0007] In order to achieve these purposes and other advantages according to the present invention, there is provided an antifreeze type oil and water well casing pressure detection device, which comprises: A pipe joint, which is arranged on one side of the wellhead big four-way of the oil and water well; A pressure detection instrument, which is arranged on the pipeline joint; A probe is arranged in the annular space formed by the casing and the oil pipe of the oil and water well and is located below the antifreeze layer; the probe is communicatively connected with the pressure detection instrument through an armored cable; The guide tube is an L-shaped structure sleeved on the outside of the armored cable. One side of the guide tube is provided with openings with two ends passing through. The horizontal part of the guide tube is horizontally located in the pipe joint, and the vertical part is vertically located in the annular space formed by the casing and the oil pipe of the oil and water well.

[0008] Preferably, the antifreeze type oil and water well casing pressure detection device further includes a flow diversion mechanism, which includes: A sleeve, which is located above the probe and is coaxially rotatably sleeved on the armored cable; The guide ball is sleeved on the sleeve, and the axis of the sleeve passes through the center of the guide ball; the diameter of the guide ball is larger than the radial dimension of the probe along the sleeve; the circumferential outer surface of the guide ball is provided with a spiral groove extending along the axial direction of the sleeve.

[0009] Preferably, in the antifreeze type oil-water well casing pressure detection device, a water inlet is provided on the top of the guide ball, a spiral guide groove is provided inside the guide ball, the top of the guide groove is connected to the water inlet, and a water outlet is provided on the side.

[0010] Preferably, in the antifreeze type oil-water well casing pressure detection device, a filter screen is provided on the top of the water inlet.

[0011] Preferably, the antifreeze type oil and water well casing pressure detection device further includes an anti-slip mechanism, which includes: A fixing ring, which is an annular structure fixedly sleeved on the armored cable, and the fixing ring is located between the probe and the guide ball; the top of the probe is connected to the fixing ring through a connecting rod; A plurality of anti-slip sheets are arranged at a circumferential interval ring on the periphery of the fixing ring, each anti-slip sheet is connected by a first elastic telescopic member extending radially along the fixing ring, and each first elastic telescopic member is telescopic along the radial direction of the fixing ring; The movable plug is an annular structure sleeved on the outside of the armored cable. The movable plug is connected to the fixed ring through a second elastic telescopic part extending in the vertical direction. Under the impact of the downward flowing fluid, the movable plug moves downward and squeezes into between the multiple anti-slip sheets and the fixed ring, stretching the second elastic telescopic part so that the multiple anti-slip sheets move radially outward, and the anti-slip sheets can be tightly attached to the outer wall of the oil pipe or the inner wall of the casing.

[0012] Preferably, in the antifreeze type oil and water well casing pressure detection device, the bottom of the cross section of the movable plug at any position along the vertical direction is a conical structure with the top angle facing downward.

[0013] Preferably, in the antifreeze type oil and water well casing pressure detection device, each anti-slip sheet and movable plug is made of elastic silicone material.

[0014] Preferably, the antifreeze type oil and water well casing pressure detection device further comprises: A shell, which is arranged on the pipe joint and is used to encapsulate the pressure detection instrument. A through hole is provided on the top of the shell for the instrument panel of the pressure detection instrument to pass through. A transparent cover is provided on the top of the through hole. One end of the cover is hinged to the side wall of the through hole, and the other end is detachably connected to the side wall of the through hole through a buckle; A code disk is arranged on the housing and is used to control the opening of the buckle.

[0015] The present invention has at least the following beneficial effects: 1. The antifreeze type oil and water well casing pressure detection device provided by the present invention sets the pressure detection probe below the antifreeze layer to avoid the technical defect that the actual casing pressure value cannot be accurately obtained due to freezing of the casing space in cold weather; 2. In order to improve the installation efficiency of the detection device, the present invention further provides a guide tube for lowering the probe and the armored cable, so as to prevent the probe and the armored cable from touching the casing or the oil pipe wall during the lowering process, thereby preventing the probe and the armored cable from being stuck and being unable to be lowered into place; 3. Furthermore, the present invention is provided with a flow guide mechanism, which can disperse the liquid flowing downward above the probe in advance, thereby avoiding the problem that the downward flowing liquid has too much impact force on the probe, causing the probe to fall off; 4. The present invention provides an anti-skid mechanism, and when the impact force of the water flow is too large, the probe can be connected to the outer wall of the oil pipe and the inner wall of the casing through the anti-skid sheet to prevent the probe from falling off due to the excessive impact force of the downwardly flowing liquid. At the same time, the downward movement of the piston, the expansion and contraction of the first elastic telescopic member and the second elastic telescopic member, and the movement of multiple anti-skid sheets can consume part of the potential energy of the water flow to a certain extent, weaken the impact force of the water flow on the probe, and further improve the anti-slip performance.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an antifreeze type oil and water well casing pressure detection device described in one technical solution of the present invention; Figure 2 It is a schematic structural diagram of the anti-skid sheet of the anti-skid mechanism in another technical solution of the present invention in a retracted state; Figure 3 For the present invention Figure 2 A partial enlarged view of middle A; Figure 4 It is a structural schematic diagram of the anti-skid sheet of the anti-skid mechanism in another technical solution of the present invention in an open state; Figure 5 For the present invention Figure 4A partial enlarged view of middle A; Figure 6 A top view of the anti-skid sheet of the anti-skid mechanism in another technical solution of the present invention in a retracted state; Figure 7 A top view of an anti-skid sheet of an anti-skid mechanism in another technical solution of the present invention in an open state; Figure 8 It is a structural schematic diagram of a guide ball of an antifreeze type oil and water well casing pressure detection device described in another technical solution of the present invention.

[0018] Explanation of the reference numerals: 1-oil pipe; 2-casing; 3-wellhead large four-way; 4-pipe joint; 41-shell; 42-cover; 5-pressure detection instrument; 51-instrument panel; 6-probe; 7-armored cable; 71-guide tube; 81-sleeve; 82-guide ball; 821-spiral groove; 822-water inlet; 823-guide groove; 824-water outlet; 91-fixing ring; 92-fixing rod; 93-connecting rod; 94-anti-slip sheet; 95-first elastic telescopic member; 96-movable plug; 97-second elastic telescopic member. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0020] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0021] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0022] In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] like Figures 1 to 8 As shown, the present invention provides an antifreeze type oil and water well casing pressure detection device, which includes: A pipe joint 4, which is arranged on one side of the wellhead big four-way 3 of the oil and water well; A pressure detection instrument 5, which is arranged on the pipeline joint 4; The probe 6 is arranged in the annular space formed by the casing 2 and the oil pipe 1 of the oil and water well and is located below the antifreeze layer; the probe 6 is connected to the pressure detection instrument 5 through the armored cable 7; the armored cable is also called armored cable, which is made of conductors of different materials installed in a metal casing with insulating material and is processed into a bendable solid assembly; The guide tube 71 is an L-shaped structure sleeved on the outside of the armored cable 7. One side of the guide tube 71 is provided with openings with two ends passing through. The horizontal portion of the guide tube 71 is horizontally located in the pipe joint 4, and the vertical portion is vertically located in the annular space formed by the casing 2 and the oil pipe 1 of the oil and water well.

[0024] In the above technical scheme, the present invention provides an antifreeze type oil and water well casing pressure detection device, which can be used for annular space pressure detection of oil fields in high-cold areas. The antifreeze type oil and water well casing pressure detection device includes a pipe joint 4 connected to one side of a large four-way 3 at the wellhead of the oil and water well, a pressure detection instrument 5 is arranged on the pipe joint 4, and a pressure detection probe 6 is arranged in the annular space formed by the oil pipe 1 and the casing 2 of the oil well, and is located below the antifreeze layer. The depth of the antifreeze layer in different oil field environments is different. For example, the antifreeze layer in some areas is 2 meters below the ground, and some are deeper. The probe 6 is connected to the pressure detection instrument 5 through an armored cable 7. The armored cable 7 is used to convert the pressure signal detected by the probe 6 into a pressure value, and transmit it to the pressure detection instrument 5, and display it through the instrument panel 51 of the pressure detection instrument 5 for staff to view; the armored cable 7 is made of pressure-resistant and corrosion-resistant materials to prevent the high-pressure environment or corrosive substances in the annular space from damaging the detection element; when the antifreeze type oil and water well casing pressure detection device provided by the present invention is installed, the probe 6 It passes horizontally through the pipe joint 4 and one side of the wellhead big four-way 3 of the oil and water well, enters the annular space, and then extends vertically downward to two meters below the ground of the annular space. In order to meet the lowering distance of the probe 6, the length of the armored cable 7 is relatively long. In order to ensure the smooth and rapid lowering and installation of the probe 6 and the armored cable 7, the technical solution further provides a guide tube 71, which is an L-shaped structure. Preferably, the angle between the vertical part and the horizontal part of the guide tube is greater than ninety degrees (that is, it is not limited to a right-angled L-shaped structure); the guide tube 7 The inner diameter of the guide tube 1 is larger than the outer diameter of the armored cable 7, so that the armored cable 7 can move relative to the guide tube 71. One side of the guide tube 71 is provided with an L-shaped opening consistent with the shape thereof, which runs through both ends of the guide tube 71, and the armored cable 7 is passed through the opening, and then the guide tube 71 is sleeved on the outside of the armored cable 7, so that the probe 6 and the armored cable 7 can be inserted horizontally from the beginning and guided to vertically downward, so as to avoid the probe 6 being stuck by the wall of the oil pipe 1 and the casing 2, and being unable to be lowered normally, thereby improving the working efficiency of lowering the probe 6 and the armored cable 7.

[0025] When installing the antifreeze type oil and water well casing pressure detection device, the guide tube 71 is sleeved on the end of the armored cable 7 close to the probe 6. The specific sleeve method is to insert the armored cable 7 into the guide tube 71 through the opening (the opening width is slightly approximately the outer diameter of the armored cable 7), and then the probe 6 and the guide tube 71 are horizontally passed through one side of the wellhead large four-way 3, and the probe 6 is inserted into the annular space. The free end of the horizontal part of the guide tube 71 is connected to the pipe joint 4, and then the armored cable 7 is pushed inward relative to the guide tube 71, and then the probe 6 is moved downward in the annular space. After the probe 6 is lowered into place, the pressure detection instrument 5 is connected to the wellhead large four-way 3 through the pipe joint 4.

[0026] The present invention arranges the pressure detection probe 6 2 meters below the ground to avoid the technical defect that the solid-liquid mixture in the annulus space blocks the pressure port, or the annulus space freezes due to cold weather, resulting in the inability to accurately obtain the actual sleeve pressure value.

[0027] In another technical solution, the antifreeze type oil and water well casing pressure detection device further includes a flow diversion mechanism, which includes: A sleeve 81, which is located above the probe 6 and is coaxially rotatably sleeved on the armored cable 7; The guide ball 82 is sleeved on the sleeve 81, and the axis of the sleeve 81 passes through the center of the guide ball 82; the diameter of the guide ball 82 is larger than the radial dimension of the probe 6 along the sleeve 81; the circumferential outer surface of the guide ball 82 is provided with a spiral groove 821 extending along the axial direction of the sleeve 81.

[0028] In the above technical scheme, the present invention can pre-disperse the downward-flowing liquid by arranging a sleeve 81 and a guide ball 82 on the armored cable 7, thereby reducing the downward impact force of the downward-flowing liquid on the probe 6, and avoiding the probe 6 from falling off due to excessive impact force of the downward-flowing liquid on the probe 6; specifically, a sleeve 81 is coaxially rotatably sleeved on the armored cable 7, which is located near the probe 6 and above the probe 6, and the guide ball 82 is sleeved on the sleeve 81, and the axis of the sleeve 81 passes through the center of the guide ball 82. The diameter of the guide ball 82 is smaller than the radial width of the annular space and larger than the radial size of the probe 6. A spiral groove 821 is arranged on the outer surface of the guide ball 82, and the downward-flowing liquid passes through the guide ball 82 and flows downward along the spiral groove 821, which can drive the guide ball 82 to rotate relative to the armored cable 7, and then consumes the impact force of the liquid flow through power work, thereby further reducing the downward impact force of the downward-flowing liquid on the probe 6.

[0029] In another technical solution, in the antifreeze type oil-water well casing pressure detection device, the top of the guide ball 82 is provided with a water inlet 822, the interior of the guide ball 82 is provided with a spiral guide groove 823, the top of the guide groove 823 is connected to the water inlet 822, and the side is provided with a water outlet 824. Further, a spiral guide groove 823 is provided inside the guide ball 82, and a water inlet 822 connected to the guide groove 823 is provided on the top of the guide ball 82, and a water outlet 824 connected to the guide groove 823 is provided on the side, and the liquid flowing downward enters the guide groove 823 through the water inlet 822, flows downward along the spiral path, and the guide ball 82 rotates around the high-voltage line axis, and the liquid is discharged through the water outlet 824 under the centrifugal effect, and the liquid is dispersed to the surroundings, further weakening the downward impact of the downward flowing liquid on the probe 6.

[0030] In another technical solution, the antifreeze type oil and water well casing pressure detection device is provided with a filter screen at the top of the water inlet 822. The filter screen provided at the water inlet 822 can filter the liquid entering the guide groove 823 to prevent impurities in the liquid from clogging the water outlet 824.

[0031] In another technical solution, the antifreeze type oil and water well casing pressure detection device further includes an anti-slip mechanism, which includes: A fixing ring 91 is an annular structure fixedly sleeved on the armored cable 7, and the fixing ring 91 is located between the probe 6 and the guide ball 82; the fixing ring 91 is connected to the outer wall of the armored cable 7 through a plurality of fixing rods 92 arranged at intervals along the circumferential direction; the top of the probe 6 is connected to the fixing ring 91 through a connecting rod 93; A plurality of anti-slip sheets 94 are arranged at intervals along the circumferential direction on the periphery of the fixing ring 91, each anti-slip sheet 94 is connected by a first elastic telescopic member 95 extending radially along the fixing ring 91, and each first elastic telescopic member 95 is telescopic along the radial direction of the fixing ring 91; The movable plug 96 is an annular structure sleeved on the outside of the armored cable 7. The movable plug 96 is connected to the fixed ring 91 through a second elastic telescopic member 97 extending in the vertical direction. Under the impact of the downward flowing fluid, the movable plug 96 moves downward and squeezes into between the multiple anti-slip sheets 94 and the fixed ring 91, stretching the second elastic telescopic member 97 so that the multiple anti-slip sheets 94 move radially outward, and at least one anti-slip sheet 94 is in close contact with the outer wall of the oil pipe or the inner wall of the casing.

[0032] In the above technical scheme, the present invention is provided with an anti-skid mechanism, which, through the cooperation of the fixing ring, the anti-skid sheet and the piston, can associate the probe with the outer wall of the oil pipe and the inner wall of the casing when the impact force of the water flow flowing downward in the annular space is too large, so as to prevent the probe from falling off. The specific anti-skid mechanism includes a fixing ring 91 of an annular structure fixedly sleeved on the armored cable 7 between the probe 6 and the guide ball 82. The fixing ring 91 is specifically connected to the armored cable 7 by a plurality of fixing rods 92 connected to the outer wall of the armored cable 7. Each fixing rod 92 extends along the radial direction of the fixing ring. Preferably, the fixing ring 91 is symmetrically arranged. A pair of fixing rods are arranged, the fixing rod 92 is welded to the outer wall of the armored cable 7, the top of the probe 6 is connected to the fixing ring 91 through an L-shaped connecting rod 93, and a plurality of anti-skid sheets arranged at intervals in the circumferential direction are further arranged on the periphery of the fixing ring 91. The circular structure formed by the plurality of anti-skid sheets is concentric with the fixing ring 91, and each anti-skid sheet is connected to the bottom of the fixing ring 91 through a first elastic retractable member extending radially along the fixing ring 91. When the external force is released, it retracts radially along the fixing ring 91 under the elastic restoring force, and each anti-skid sheet 94 is preferably set to an arc structure concentric with the fixing ring 91 The outer side of the anti-skid sheet 94 is provided with an anti-skid protrusion, which can increase the friction between the anti-skid sheet 94 and the outer wall of the oil pipe 1 or the inner wall of the casing 2; a movable plug that can move along the axial direction of the armored cable is provided. In the absence of external force (the downward impact force generated by the downward flowing water flow), the movable plug is located directly above the annular spacing area formed by the fixed ring 91 and the multiple anti-skid sheets 94. The movable plug 96 does not interfere with the anti-skid sheet 94 and the fixed ring 91. When the water flow in the annular space flows downward, a downward impact force is applied to the movable plug, driving the movable plug to move downward, and the movable plug is inserted into the fixed ring 91 and the multiple anti-skid sheets 94. In the formed annular interval, the movable plug pushes the multiple anti-slip sheets radially outward, and the first elastic telescopic member stretches radially. When the movable plug moves downward (the second elastic telescopic member is compressed) to the limit position, at least one anti-slip sheet is in close contact with the outer wall of the oil pipe, and at least one anti-slip sheet is in close contact with the inner wall of the casing, so that the probe is hung on the pipe wall to prevent the probe from being washed away by excessive water flow impact. When there is no water flow in the annular space or the water flow impact force is small, under the elastic restoring force of the first elastic telescopic rod and the second elastic telescopic member, the movable plug moves upward to reset, and the multiple anti-slip sheets move radially inward to reset. The specific structures of the first elastic telescopic part and the second elastic telescopic part can be designed as: including an inner rod and an outer rod that are coaxially slidably sleeved inside and outside, one end of the outer rod is connected to a fixed ring, one end of the inner rod passes through the other end of the outer rod and slides into the interior of the outer rod, and is connected to the inner wall of the outer rod through a spring, the other end of the inner rod is connected to an anti-slip sheet / movable plug, and the spring extends along the telescopic direction of the telescopic part.

[0033] The present invention provides an anti-skid mechanism, and when the impact force of the water flow is too large, the probe can be connected to the outer wall of the oil pipe and the inner wall of the casing through the anti-skid sheet, so as to prevent the impact force of the downward-flowing liquid from being too large, causing the probe to fall off and fall downward. At the same time, the downward movement of the piston, the expansion and contraction of the first elastic telescopic member and the second elastic telescopic member, and the movement of multiple anti-skid sheets can consume part of the potential energy of the water flow to a certain extent, weaken the impact force of the water flow on the probe, and further improve the anti-slip performance. In another technical solution, in the antifreeze type oil and water well casing pressure detection device, the bottom of the cross section of the movable plug 96 at any position along the vertical direction is a conical structure with the top angle downward. The bottom of the movable plug is set to a conical structure, which can be inserted more smoothly between the fixing ring and the multiple anti-skid sheets.

[0034] In another technical solution, in the antifreeze type oil and water well casing pressure detection device, each anti-slip sheet 94 and the movable plug 96 are made of elastic silicone material, so that the anti-slip sheet and the movable plug have a certain deformation performance, and the adhesion between the anti-slip sheet and the pipe wall is improved, thereby achieving the purpose of improving the anti-slip performance.

[0035] In another technical solution, the antifreeze type oil and water well casing pressure detection device further includes: A shell 41 is provided on the pipe joint 4 and is used to encapsulate the pressure detection instrument 5. A through hole is provided on the top of the shell 41 for the instrument panel 51 of the pressure detection instrument 5 to pass through. A transparent cover 42 is provided on the top of the through hole. One end of the cover 42 is hinged to the side wall of the through hole, and the other end is detachably connected to the side wall of the through hole through a buckle. A code disk is disposed on the housing 41 and is used to control the opening of the buckle.

[0036] In the above technical scheme, the present invention further provides a shell 41 and an anti-theft code disk. In the present invention, the pipe joint 4 is preferably a clamp-type joint, which connects the shell 41 and one side of the wellhead large four-way 3 at the joint. A through hole is opened at one end of the principle oil pipe 1 of the shell 41 for the instrument panel 51 to pass through, and a cover body 42 is rotatably arranged on the through hole. The other end of the cover body 42 is opened by a buckle controlled by the code disk. The cover body 42 can be opened only by entering the correct password on the code disk, thereby improving the anti-theft performance of the pressure detection device.

[0037] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0038] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Antifreeze type oil and water well casing pressure detection device, characterized in that: include: A pipe joint, which is arranged on one side of the wellhead big four-way of the oil and water well; A pressure detection instrument, which is arranged on the pipeline joint; A probe is arranged in the annular space formed by the casing and the oil pipe of the oil and water well and is located below the antifreeze layer; the probe is communicatively connected with the pressure detection instrument through an armored cable; The guide tube is an L-shaped structure sleeved on the outside of the armored cable. One side of the guide tube is provided with openings with two ends passing through. The horizontal part of the guide tube is horizontally located in the pipe joint, and the vertical part is vertically located in the annular space formed by the casing and the oil pipe of the oil and water well.

2. The antifreeze type oil and water well casing pressure detection device according to claim 1, characterized in that: Also included is a flow guiding mechanism, which includes: A sleeve, which is located above the probe and is coaxially rotatably sleeved on the armored cable; The guide ball is sleeved on the sleeve, and the axis of the sleeve passes through the center of the guide ball; the diameter of the guide ball is larger than the radial dimension of the probe along the sleeve; the circumferential outer surface of the guide ball is provided with a spiral groove extending along the axial direction of the sleeve.

3. The antifreeze type oil and water well casing pressure detection device according to claim 2, characterized in that: A water inlet is arranged on the top of the guide ball, a spiral guide groove is arranged inside the guide ball, the top of the guide groove is communicated with the water inlet, and a water outlet is arranged on the side.

4. The antifreeze type oil and water well casing pressure detection device according to claim 3, characterized in that: A filter screen is arranged on the top of the water inlet.

5. The antifreeze type oil and water well casing pressure detection device according to claim 4, characterized in that: Also included is an anti-slip mechanism comprising: A fixing ring, which is an annular structure fixedly sleeved on the armored cable, and the fixing ring is located between the probe and the guide ball; the top of the probe is connected to the fixing ring through a connecting rod; A plurality of anti-slip sheets are arranged at a circumferential interval ring on the periphery of the fixing ring, each anti-slip sheet is connected by a first elastic telescopic member extending radially along the fixing ring, and each first elastic telescopic member is telescopic along the radial direction of the fixing ring; The movable plug is an annular structure sleeved on the outside of the armored cable. The movable plug is connected to the fixed ring through a second elastic telescopic part extending in the vertical direction. Under the impact of the downward flowing fluid, the movable plug moves downward and squeezes into between the multiple anti-slip sheets and the fixed ring, stretching the second elastic telescopic part so that the multiple anti-slip sheets move radially outward, and the anti-slip sheets can be tightly attached to the outer wall of the oil pipe or the inner wall of the casing.

6. The antifreeze type oil and water well casing pressure detection device according to claim 5, characterized in that: The bottom of the cross section of the movable plug at any position along the vertical direction is a conical structure with the top angle downward.

7. The antifreeze type oil and water well casing pressure detection device according to claim 6, characterized in that: Each anti-slip sheet and the movable plug are made of elastic silicone material.

8. The antifreeze type oil and water well casing pressure detection device according to claim 1, characterized in that: Also includes: A shell, which is arranged on the pipe joint and is used to encapsulate the pressure detection instrument. A through hole is provided on the top of the shell for the instrument panel of the pressure detection instrument to pass through. A transparent cover is provided on the top of the through hole. One end of the cover is hinged to the side wall of the through hole, and the other end is detachably connected to the side wall of the through hole through a buckle; A code disk is arranged on the housing and is used to control the opening of the buckle.

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