Seating tool set and method for monitoring temperature and pressure of geothermal / hot dry rock well

Abstract

The invention discloses a seating tool set and method for monitoring the temperature and pressure of a geothermal / hot dry rock well. The seating tool set includes a seating tool. The seating tool is composed of a fishing head, a seating device and an adapter which are connected up and down, and the seating device is used for being clamped in a seating pup joint arranged in a drilling well in the well entering and putting process so that the pressure and temperature sensor hung below the adapter through a steel wire rope can be located in an underground target reservoir. The top and the bottom of the seating pup joint are in threaded connection with casing pipes, and the seating pup joint and the casing pipes form a supporting oil pipe arranged from a well mouth to a well bottom. While long-term pressure and temperature monitoring is carried out on the underground target reservoir, the problems that resources are wasted and other operations cannot be carried out due to the fact that equipment is retained on the ground are solved.

Description

Technical Field

[0001] The invention relates to a set of tools and a method for monitoring in-situ temperature and pressure changes of underground reservoirs in geothermal / hot dry rock wells, belonging to the field of geothermal / hot dry rock well reservoir parameter monitoring. Background Art

[0002] Geothermal resources are a renewable resource originating from the earth's interior. my country has abundant reserves and wide distribution. Compared with other energy sources, geothermal resources are clean and efficient. They have been widely used in heating, industrial and agricultural heat utilization, etc.

[0003] Geothermal / hot dry rock well monitoring is the key to the development and utilization of geothermal resources. There are two main monitoring methods: direct monitoring and indirect monitoring. The objects of direct monitoring generally include well production, fluid temperature, well water level, well temperature, pressure changes and well status. Among them, monitoring of reservoir temperature and pressure changes is basic work and requires long-term monitoring. By monitoring the temperature and pressure changes of the reservoir, the reservoir can be refined and scientifically managed, so that the reservoir can achieve the purpose of long-term heat extraction. In addition, by long-term monitoring of reservoir temperature and pressure parameters underground, it can also be used to study the sensing technology and transmission methods of temperature-resistant sensors (such as piezoelectric pressure sensors, platinum resistance thermometers, fiber optic sensing temperature and pressure sensors, etc.).

[0004] At present, geothermal resource exploration borrows the mature experience of the oil and gas industry and often uses the technology of oil pipe support to lower the sensor into the well, that is, lower the multiple casings connected up and down to the bottom of the well, and the sensor is tied to the end of the wire rope. The wire rope lowers the sensor through the winch on the ground. This method is mature, reliable and real-time, but it can be found from actual operation that this method has the following defects: First, the monitoring of reservoir temperature and pressure changes usually requires long-term monitoring for half a year to one year. If the winch is used to control the wire rope to lower the sensor, the winch and other equipment need to be placed beside the well for a long time and cannot be used for other operations. It can be seen that it causes a great waste of equipment. If the wire rope is fixed by setting a support structure at the wellhead after the sensor is lowered into the well, the workload is increased invisibly, and the stability of the wire rope cannot be guaranteed. Second, if the method of lowering the sensor by wire rope is used, it is impossible to perform operations such as fluid sampling in the well while monitoring the temperature and pressure changes downhole. The reason is that the wire rope in the well prevents equipment used for other operations from entering the well. Even if it enters the well, it will affect the wire rope and the sensor hanging at the end, thereby affecting the monitoring accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a set of tools and methods for monitoring the temperature and pressure of geothermal / hot dry rock wells, which can realize long-term pressure and temperature monitoring of the target reservoir underground, and solve the problem of equipment being stranded on the ground, causing waste of resources and inability to carry out other operations.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A seating tool set for monitoring temperature and pressure in geothermal / hot dry rock wells, comprising a seating tool, wherein: the seating tool is composed of a salvage head, a seater and an adapter connected up and down, the salvage head is used to connect to the salvage device, the adapter is used to connect a pressure and temperature sensor via a connecting wire rope, the seater is used to be stuck in a seating short circuit arranged in the well during the well placement process, so that the pressure and temperature sensor suspended below the adapter via the connecting wire rope is located in the target reservoir downhole, wherein the top and bottom of the seating short circuit are threaded with casing, and the seating short circuit and the casing form a supporting oil pipe arranged from the wellhead to the bottom of the well.

[0008] A method for monitoring temperature and pressure of a geothermal / dry hot rock well, comprising the steps of:

[0009] 1) In the open hole stage, determine the downhole depth of the target reservoir and make the support tubing accordingly;

[0010] 2) lowering the support tubing to the bottom of the well, so that the landing short circuit on the support tubing is above the target reservoir;

[0011] 3) making a diameter-adjusting tool string, wherein the diameter-adjusting tool string comprises a wire rope cap, a weight rod, a jar and a diameter gauge connected up and down;

[0012] 4) The wire rope is operated by a winch arranged on the ground to lower the string of tools to perform the operation, wherein: the wire rope is pulled up to test the tension and record it every 500m of lowering; when the distance to the target reservoir is 300m, the wire rope is pulled up to test the tension and record it every 100m; when the tool encounters resistance when the tool reaches the location short-circuit, the depth data of the location short-circuit obtained is compared with the location of the location short-circuit when the support oil pipe is made, so as to ensure the correctness of the pressure and temperature monitoring position;

[0013] 5) After the dredging operation is completed, the dredging tool string is lifted up and retracted;

[0014] 6) Converting the through-diameter tool string into a launching tool string, wherein the launching tool string includes the wire rope cap, the weighting rod, the jar, the bailer, and the landing tool connected in upper and lower parts, and the landing tool is connected to the pressure and temperature sensor through a connecting wire rope;

[0015] 7) The delivery tool string is lowered by operating the wire rope by the winch to perform the delivery operation, wherein: during the process of lowering the delivery tool string, the pressure and temperature data are measured every set depth; the wire rope is pulled up to test the tension and recorded every 500m of lowering; when the distance from the landing short circuit is 100m, the wire rope is pulled up every 50m to test the tension and record it; when the distance from the landing short circuit is 50m, it is lowered at a speed of 15m / min until the wire rope tension is reduced by 20kg, and the delivery tool string is lifted up to a position 20m away from the landing short circuit, thereby repeatedly shocking downward at a high speed of 80m / min, so that the landing tool and the pressure and temperature sensor suspended thereunder are separated from the bailer and fall and get stuck on the landing short circuit, wherein the shocking is stopped when it is confirmed that the landing tool has separated from the bailer by comparing the wire rope tension;

[0016] 8) After the delivery operation is completed, the delivery tool string is lifted up and retracted;

[0017] 9) The pressure and temperature sensor in the target reservoir downhole begins to perform long-term monitoring of pressure and temperature changes.

[0018] The advantages of the present invention are:

[0019] The present invention not only realizes placing the pressure and temperature sensor in the target reservoir underground for long-term monitoring (half a year to a year), but also eliminates the need for ground equipment such as winches to remain, thereby solving the problem of wasting equipment resources. In addition, in the process of monitoring temperature and pressure changes, other operations such as fluid sampling can be carried out in the well without affecting the monitoring, thus making cross-operation possible and greatly improving work efficiency. The present invention is suitable for promotion in the field of geothermal resource exploration.

[0020] The method for placing and retrieving the pressure and temperature sensor of the present invention is simple, effective, and quick, with low implementation cost, and can provide stable support for the pressure and temperature sensor, thereby ensuring the accuracy of monitoring and meeting the needs for in-situ temperature and pressure monitoring of underground reservoirs in geothermal wells and hot dry rock wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the seating tool set of the present invention.

[0022] Figure 2 It is a structural diagram of the positioning tool.

[0023] Figure 3 yes Figure 2 AA section diagram of .

[0024] Figure 4 It is a schematic diagram of the structure located in short circuit.

[0025] Figure 5This is a schematic diagram of the composition of the path tool string.

[0026] Figure 6 This is a schematic diagram of the composition of the delivery tool string.

[0027] Figure 7 It is a schematic diagram of the composition of the fishing tool string.

[0028] Figure 8 It is an implementation diagram of the geothermal / dry hot rock well temperature and pressure monitoring method of the present invention. DETAILED DESCRIPTION

[0029] like Figures 1 to 8 As shown, the present invention proposes a seating tool set for monitoring temperature and pressure of geothermal / dry hot rock wells, including a seating tool 10, wherein: the seating tool 10 is composed of a fishing head 11, a seater 12 and an adapter 13 connected up and down, the fishing head 11 is used to connect with the fishing device 100, the adapter 13 is used to connect the pressure and temperature sensor 50 via a connecting wire rope 40, generally, the top of the seater 12 is screwed to the bottom of the fishing head 11, the top of the adapter 13 is screwed to the bottom of the seater 12, and the seater 12 is used to get stuck or sit in the process of being put into the well The seated short circuit 20 arranged in the well 300 is placed in the wellbore 300, so that the pressure and temperature sensor 50 suspended below the adapter 13 via the connecting wire rope 40 is located in the target reservoir 400 downhole, wherein the top and bottom of the seated short circuit 20 are threaded with casing 30, and the seated short circuit 20 and the casing form a supporting oil pipe arranged from the wellhead of the well 300 to the bottom of the well, and the supporting oil pipe is close to but not in contact with the well wall. The number of casings 30 threaded at the top and bottom of the seated short circuit 20 is not limited, as long as the pressure and temperature sensor 50 can eventually be located in the target reservoir.

[0030] Here, the supporting oil pipe adopts the conventional practice of the oil and gas industry, but the supporting oil pipe of the oil and gas industry is only composed of upper and lower threaded casings without the seating short-circuit 20.

[0031] like Figure 1 and Figure 2 A cone head 111 is provided at the top of the salvage head 11, wherein: when performing the dropping operation, the cone head 111 of the salvage head 11 is clamped in the salvage tube of the salvage device 100 and fixed with a copper or aluminum pin. During the dropping process, the pin can fall off under the impact of a downward high speed (such as 80m / min), and the landing tool 10 and the pressure and temperature sensor 50 thereunder can be separated from the salvage device 100 and fall down by themselves; when performing the retrieval operation, the cone head 111 of the salvage head 11 can be inserted into the salvage tube of the salvage device 100 that is lowered at a low speed (such as 5-15m / min) and then clamped by the salvage tube, so as to retrieve the landing tool 10 and the pressure and temperature sensor 50 thereunder and recover them out of the well.

[0032] like Figure 2and Figure 3 The seater 12 includes a column 120, the top of the column 120 is provided with an external thread for screwing with the fishing head 11, the hollow bottom of the column 120 is provided with an internal thread for screwing with the adapter 13, and the outer wall of the column 120 is evenly distributed with a plurality of seat wings 121 ( Figure 3 1 shows a situation where four landing wings 121 are evenly distributed); Figure 4 The short-circuit 20 includes a cylinder 21 , the inner wall of the cylinder 21 is provided with a circle of bosses 22 to form a funnel-shaped cavity in the cylinder 21 , and the top and bottom of the outer wall of the cylinder 21 are provided with external threads 210 for threading with the sleeve 30 .

[0033] During the placement process, the adapter 13 and the pressure temperature sensor 50 under the seater 12 can pass through the hole 23 formed by the boss 22, but the seater 121 is blocked by the boss 22, so that the seater 12 cannot pass through the hole 23, so that the seater 12 is stuck in the seater short circuit 20. Figure 1 .

[0034] In actual design, Figure 2 and Figure 4 The upward portion of the boss 22 is set as a slope 220, and the downward portion of the seating wing 121 is set as a slope 1210, and the upward slope 220 of the boss 22 is adapted to the downward slope 1210 of the seating wing 121, so that the seating wing 121 of the seater 12 can be firmly stuck on the boss 22 of the seating short circuit 20, reducing the wear on the seating wing 121.

[0035] Further preferably, the longitudinal section of the boss 22 is in the shape of an inverted isosceles trapezoid. This structural design eliminates the need for workers to check the front and back of the short-circuit 20 when installing the supporting oil pipe, thereby reducing the workload and the chance of rework due to installation errors.

[0036] In the present invention, the structure of the adapter 13 is not limited, as long as its top end can be screwed to the seat 12 and its bottom end can hang the pressure and temperature sensor 50 .

[0037] The present invention also proposes a method for monitoring the temperature and pressure of a geothermal / dry hot rock well, which is implemented based on the tool set of the present invention, referring to Figure 8 To understand, including steps:

[0038] 1) In the open hole stage, the downhole depth of the target reservoir 400 is determined, and the support tubing is manufactured accordingly;

[0039] 2) lowering the supporting oil pipe to the bottom of the well 300, so that the landing short circuit 20 on the supporting oil pipe is above the target reservoir 400, so as to finally enable the pressure and temperature sensor 50 to be located in the target reservoir 400;

[0040] 3) Making a diameter tool string, wherein the diameter tool string includes a wire rope cap 60, a weight rod 70, a jar 80 and a diameter gauge 90 connected up and down, such as Figure 5 , the wire rope cap 60 is used to connect with the wire rope operated by the winch;

[0041] 4) The winch (with shock function) arranged on the ground 200 is used to operate the wire rope to lower the diameter tool string (the wire rope is lowered to the bottom of the well through the wellhead pulley), so as to perform the diameter operation, wherein: the wire rope is pulled up (10m-15m) every 500m to test the tension and record it; when the distance from the target reservoir is 400-300m, the wire rope is pulled up every 100m to test the tension and record it; when the diameter is blocked when reaching the landing short circuit 20, the depth data of the landing short circuit 20 is compared with the position of the landing short circuit 20 when making the support oil pipe, so as to ensure the correctness of the pressure and temperature monitoring position;

[0042] 5) After the dredging operation is completed, lift up and retract the dredging tool string;

[0043] 6) Convert the full-diameter tool string into a delivery tool string, wherein the delivery tool string includes a wire rope cap 60, a weight rod 70, a jar 80, a scoop 100, and a landing tool 10 connected up and down, and the landing tool 10 is connected to a pressure and temperature sensor 50 through a connecting wire rope 40 (wire rope), such as Figure 6 ;

[0044] 7) The wire rope is operated by a winch to lower the delivery tool string, thereby performing the delivery operation, wherein: during the process of lowering the delivery tool string, the pressure and temperature data are measured every set depth; the wire rope is pulled up to test the tension and recorded every 500m of lowering; when the distance from the landing short circuit 20 to 100m is 100m, the wire rope is pulled up to test the tension and recorded every 50m; when the distance from the landing short circuit 20 to 50m is 200m, it is lowered at a speed of 15m / min until the wire rope tension is reduced by 20kg (indicating that the landing tool 10 is already on the landing short circuit 20 but has not yet been detached), and the delivery tool string is lifted up to a position 200m away from the landing short circuit 20, thereby repeatedly shocking downward at a high speed of 80m / min, so that the landing tool 10 and the pressure and temperature sensor 50 suspended thereunder are separated from the bailer 100 (the pin falls off) and fall and get stuck or sit on the landing short circuit 20, wherein the shocking is stopped when it is confirmed by comparing the wire rope tension that the landing tool 10 has been separated from the bailer 100;

[0045] 8) After the delivery operation is completed, the delivery tool string is lifted up and retracted (at this time, there is no landing tool 10 and the pressure and temperature sensor 50 thereunder);

[0046] 9) The pressure and temperature sensor 50 in the downhole target reservoir 400 begins to monitor the pressure and temperature changes for a long period of time (generally half a year to a year).

[0047] During the actual monitoring process, equipment such as winches on the ground do not need to stay in place, which solves the problem of wasting equipment resources, and there is no need to set up a support structure for fixing the wire rope on the well or at the wellhead. In addition, other operations such as fluid sampling in the drilling 300 can be carried out without affecting the monitoring, greatly improving work efficiency.

[0048] When the pressure and temperature monitoring is finished, the following steps are also performed:

[0049] 9) The casting tool string is converted into a catching tool string, wherein the catching tool string includes a wire rope cap 60, a weighting rod 70, a jar 80, a straightener 110 and a casting and catching device 100 connected up and down, such as Figure 6 ;

[0050] 10) The fishing tool string is lowered by operating the wire rope by a winch, thereby performing the fishing operation, wherein: during the process of lowering the fishing tool string, the wire rope is pulled up to test the tension and record it every 500m; when the distance from the landing short circuit is 20-100m, the wire rope is pulled up to test the tension and record it every 50m; when the distance from the landing short circuit is 20-50m, it is lowered at a speed of 5m / min-15m / min until the wire rope tension is reduced by 20kg (indicating that the bailer 100 is already on the landing short circuit 20), and the fishing tool string is lifted up to a position 20-20m away from the landing short circuit, wherein the landing tool 10 is confirmed to be clamped on the salvage tube of the bailer 100 by comparing the wire rope tension. If the wire rope tension does not decrease by 20kg, it is repeatedly lifted up to a position 20-50m away from the landing short circuit and lowered at a speed of 5m / min-15m / min;

[0051] 11) After the scooping operation is completed, the scooping tool string and the seating tool 10 and the pressure and temperature sensor 50 held therein are pulled up and retrieved. During the process of pulling up the scooping tool string, the pressure and temperature data are measured once at each set depth.

[0052] In the present invention, the plunger 100, the wire rope cap 60, the weighting rod 70, the jar 80, the drift gauge 90, the stabilizer 110, the casing 30, and the pressure and temperature sensor 50 are all existing devices or components in the art. Among them, the plunger 100 is generally provided with a salvage tube matching the cone head 111 of the salvage head 11 at the bottom. The structure of the salvage tube can be various, which is used to enable the salvage tube to firmly clamp the cone head 111 inserted therein when traveling at a low speed (such as 5-15m / min) and prevent it from falling off, so as to complete the upward salvage of the landing tool 10. The salvage tube can cause the cone head 111 to be disengaged under the action of high-speed (such as 80m / min) shock, and the high-speed shock can also cause the pins used to fix the salvage tube and the salvage head 11 to fall off. The pressure and temperature sensor 50 usually uses a mature pressure gauge on the market, which has a temperature measurement function while measuring pressure.

[0053] The advantages of the present invention are:

[0054] The present invention not only realizes placing the pressure and temperature sensor in the target reservoir underground for long-term monitoring (half a year to a year), but also eliminates the need for ground equipment such as winches to remain, thereby solving the problem of wasting equipment resources. In addition, in the process of monitoring temperature and pressure changes, other operations such as fluid sampling can be carried out in the well without affecting the monitoring, thus making cross-operation possible and greatly improving work efficiency. The present invention is suitable for promotion in the field of geothermal resource exploration.

[0055] The method for placing and retrieving the pressure and temperature sensor of the present invention is simple, effective, and quick, with low implementation cost, and can provide stable support for the pressure and temperature sensor, thereby ensuring the accuracy of monitoring and meeting the needs for in-situ temperature and pressure monitoring of underground reservoirs in geothermal wells and hot dry rock wells.

[0056] The above are preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, are within the scope of protection of the present invention.

Claims

1. A set of tools for monitoring temperature and pressure of geothermal / dry hot rock wells, characterized in that: It comprises a seating tool, wherein: the seating tool is composed of a salvage head, a seater and an adapter connected up and down, the salvage head is used to connect with the salvage device, the adapter is used to connect with a pressure and temperature sensor via a connecting wire rope, the seater is used to be stuck in a seating short circuit arranged in the well during the well placement process, so that the pressure and temperature sensor suspended below the adapter via the connecting wire rope is located in the target reservoir downhole, wherein the top and bottom of the seating short circuit are threaded with casing, and the seating short circuit and the casing form a supporting oil pipe arranged from the wellhead to the bottom of the well.

2. The geothermal / dry hot rock well temperature and pressure monitoring tool set as claimed in claim 1, characterized in that: A cone head is provided at the top of the salvage head, wherein: when performing the dropping operation, the cone head of the salvage head is clamped in the salvage device and fixed with a pin, and during the dropping process, the pin can fall off under the action of downward high-speed shock, and make the seating tool and the pressure and temperature sensor thereunder detach from the salvage device and fall down on their own; when performing the catching operation, the cone head of the salvage head can be clamped by the salvage device that is lowered at a low speed, so as to catch the seating tool and the pressure and temperature sensor thereunder and retrieve them out of the well.

3. The geothermal / dry hot rock well temperature and pressure monitoring tool set as claimed in claim 1, characterized in that: The seater comprises a column, the top of which is provided with an external thread for screwing with the fishing head, the hollow bottom of which is provided with an internal thread for screwing with the adapter, and the outer wall of the column is evenly distributed with a plurality of seat wings; the seated short-circuit comprises a cylinder, the inner wall of which is provided with a circle of bosses, and the top and bottom of the outer wall of the cylinder are provided with external threads for screwing with the casing; During the placement process, the adapter and the pressure and temperature sensor under the seater can pass through the hole formed by the boss, but the seating wing is blocked by the boss so that the seater cannot pass through, and the seater is stuck in the seating short circuit.

4. The geothermal / dry hot rock well temperature and pressure monitoring tool set as claimed in claim 3, characterized in that: The portion on the boss is set as an inclined surface, the portion of the seating wing facing downward is set as an inclined surface, and the upward inclined surface of the boss is matched with the downward inclined surface of the seating wing, so that the seating wing of the seater can be firmly stuck on the boss of the seating short circuit.

5. The geothermal / dry hot rock well temperature and pressure monitoring tool set as claimed in claim 4, characterized in that: The longitudinal section of the boss is in the shape of an inverted isosceles trapezoid.

6. A method for monitoring temperature and pressure of geothermal / dry hot rock wells, characterized in that: Includes steps: 1) In the open hole stage, determine the downhole depth of the target reservoir and make the support tubing accordingly; 2) lowering the support tubing to the bottom of the well, so that the landing short circuit on the support tubing is above the target reservoir; 3) making a diameter-adjusting tool string, wherein the diameter-adjusting tool string comprises a wire rope cap, a weight rod, a jar and a diameter gauge connected up and down; 4) The wire rope is operated by a winch arranged on the ground to lower the string of tools to perform the operation, wherein: the wire rope is pulled up to test the tension and record it every 500m of lowering; when the distance to the target reservoir is 300m, the wire rope is pulled up to test the tension and record it every 100m; when the tool encounters resistance when the tool reaches the location short-circuit, the depth data of the location short-circuit obtained is compared with the location of the location short-circuit when the support oil pipe is made, so as to ensure the correctness of the pressure and temperature monitoring position; 5) After the dredging operation is completed, the dredging tool string is lifted up and retracted; 6) Converting the through-diameter tool string into a launching tool string, wherein the launching tool string includes the wire rope cap, the weighting rod, the jar, the bailer, and the landing tool connected in upper and lower parts, and the landing tool is connected to the pressure and temperature sensor through a connecting wire rope; 7) The delivery tool string is lowered by operating the wire rope by the winch to perform the delivery operation, wherein: during the process of lowering the delivery tool string, the pressure and temperature data are measured every set depth; the wire rope is pulled up to test the tension and recorded every 500m of lowering; when the distance from the landing short circuit is 100m, the wire rope is pulled up every 50m to test the tension and record it; when the distance from the landing short circuit is 50m, it is lowered at a speed of 15m / min until the wire rope tension is reduced by 20kg, and the delivery tool string is lifted up to a position 20m away from the landing short circuit, thereby repeatedly shocking downward at a high speed of 80m / min, so that the landing tool and the pressure and temperature sensor suspended thereunder are separated from the bailer and fall and get stuck on the landing short circuit, wherein the shocking is stopped when it is confirmed that the landing tool has separated from the bailer by comparing the wire rope tension; 8) After the delivery operation is completed, the delivery tool string is lifted up and retracted; 9) The pressure and temperature sensor in the target reservoir downhole begins to perform long-term monitoring of pressure and temperature changes.

7. The method for monitoring temperature and pressure of geothermal / dry hot rock wells according to claim 6, characterized in that: When the pressure and temperature monitoring is finished, perform the following steps: 9) Converting the casting tool string into a catching tool string, wherein the catching tool string includes the wire rope cap, the weighting rod, the jar, the centralizer and the casting tool connected in an upper and lower manner; 10) The winch is used to operate the wire rope to lower the fishing tool string, thereby performing the fishing operation, wherein: in the process of lowering the fishing tool string, the wire rope is pulled up to test the tension and record it every 500m; when the distance from the landing short circuit is 100m, the wire rope is pulled up to test the tension and record it every 50m; when the distance from the landing short circuit is 50m, it is lowered at a speed of 5m / min-15m / min until the wire rope tension is reduced by 20kg, and the fishing tool string is lifted to a position 20m away from the landing short circuit, wherein the landing tool is confirmed to be clamped on the bailer by comparing the wire rope tension, and if the wire rope tension does not reduce by 20kg, it is repeatedly lifted up to a position 50m away from the landing short circuit and lowered at a speed of 5m / min-15m / min; 11) After the retrieval operation is completed, the retrieval tool string and the seating tool and the pressure and temperature sensor clamped therein are lifted up and retrieved, wherein during the process of lifting the retrieval tool string, the pressure and temperature data are measured once at each set depth.

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