Release tool string for monitoring temperature and pressure of geothermal / hot dry rock well

Abstract

The utility model discloses a putting tool string for monitoring temperature and pressure of a geothermal / hot dry rock well. The throwing tool string comprises a steel wire rope cap, a weighting rod, a jar, a throwing-fishing device and a seating tool which are connected up and down, and the seating tool is connected with a pressure and temperature sensor through a connecting steel wire rope. The seating tool is composed of a fishing head, a seating device and an adapter which are connected up and down, the fishing head is used for being connected with a throwing-fishing device, the adapter is used for being connected with a pressure and temperature sensor through a connecting steel wire rope, and the seating device is used for being clamped in a seating pup joint arranged in a drilling well in the well entering throwing process; and the pressure and temperature sensor hung below the adapter through the connecting steel wire rope is located in an underground target reservoir. According to the utility model, 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 utility model relates to a delivery tool string 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 a wide distribution of geothermal resources. Compared with other energy sources, geothermal resources are clean and efficient. They are currently widely used in heating, industrial and agricultural heat utilization, etc.

[0003] Geothermal / hot dry rock well monitoring is 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 fundamental work and requires long-term monitoring. By monitoring the temperature and pressure changes of the reservoir, a refined understanding and scientific management of the reservoir can be achieved, so that the reservoir can achieve the purpose of long-term heat extraction. In addition, by conducting 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] Currently, geothermal resource exploration, drawing on the proven experience of the oil and gas industry, often uses tubing-supported technology to lower sensors into the well. Specifically, multiple casing pipes, connected vertically, are lowered to the bottom of the well. Sensors are attached to the end of a wire rope, which is then lowered via a surface winch. This method is proven, highly reliable, and offers excellent real-time performance. However, in practice, this approach has the following drawbacks: First, long-term monitoring of reservoir temperature and pressure changes typically requires six months to a year. If a winch-controlled wire rope is used to lower the sensors, the winch and other equipment must be stationed near the well for extended periods, unavailable for other operations. This represents a significant waste of equipment. If, after the sensors are lowered into the well, a support structure is installed at the wellhead to secure the wire rope, this increases the workload and compromises the stability of the wire rope. Second, if the sensor is lowered by a wire rope, 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 its end, thereby affecting the monitoring accuracy. Utility Model Content

[0005] The purpose of the utility model is to provide a set of tools for monitoring the temperature and pressure of geothermal / dry-hot rock wells, which can realize long-term pressure and temperature monitoring of the target reservoir in the well, 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 purpose, the utility model adopts the following technical solutions:

[0007] A delivery tool string for monitoring temperature and pressure in geothermal / dry-hot rock wells, comprising a wire rope cap, a weighting rod, a jar, a bailing device and a seating tool connected in upper and lower directions, wherein the seating tool is connected to a pressure and temperature sensor via a connecting wire rope, wherein: the seating tool is composed of a salvage head, a bailing device and an adapter connected in upper and lower directions, the salvage head is used to be connected to the bailing device, the adapter is used to be connected to the pressure and temperature sensor via the connecting wire rope, and the bailing device is used to be stuck in a seating short circuit arranged in the well during the delivery process into the well, so that the pressure and temperature sensor suspended below the adapter via the connecting wire rope is located in the target reservoir downhole.

[0008] The advantages of the utility model are:

[0009] The utility model can place the pressure and temperature sensor in the target reservoir underground for long-term monitoring (half a year to one year) without the need for equipment such as winches on the ground to be detained, thus 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, making cross-operation possible and greatly improving work efficiency. The utility model is suitable for promotion in the field of geothermal resource exploration.

[0010] The utility model is simple, effective and fast in placing the pressure and temperature sensor, has low implementation cost, and can provide stable support for the pressure and temperature sensor, ensuring the accuracy of monitoring and meeting the needs of in-situ temperature and pressure monitoring of underground reservoirs in geothermal wells and hot dry rock wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the composition of the delivery tool string of the utility model.

[0012] Figure 2 It is a structural diagram of the positioning tool.

[0013] Figure 3 yes Figure 2 AA sectional view schematic diagram.

[0014] Figure 4 It is a schematic diagram of the structure of the short circuit.

[0015] Figure 5It is a structural schematic diagram of the utility model in which a delivery tool string is located on a short circuit.

[0016] Figure 6 This is a schematic diagram of the composition of the drift tool string.

[0017] Figure 7 This is a schematic diagram of the composition of the fishing tool string.

[0018] Figure 8 This is a diagram illustrating the use of the delivery tool string of the utility model. DETAILED DESCRIPTION

[0019] like Figures 1 to 8 As shown, the utility model proposes a delivery tool string for geothermal / dry hot rock well temperature and pressure monitoring, including a wire rope cap 60, a weight rod 70, a jar 80, a bailer 100 and a landing tool 10 connected in upper and lower directions, wherein the landing tool 10 is connected to a pressure and temperature sensor 50 through a connecting wire rope 40 (wire rope), wherein: the landing tool 10 is composed of a salvage head 11, a sitter 12 and an adapter 13 connected in upper and lower directions, the salvage head 11 is used to connect with the bailer 100, and the adapter 13 is used to connect the pressure and temperature sensor 50 via the connecting wire rope 40. Generally, the top of the sitter 12 is screwed to the bottom of the salvage head 11, and the top of the adapter 13 is screwed to the bottom of the sitter 12. The sitter 12 is used to be stuck or seated in a landing short circuit 20 arranged in the well 300 during the delivery process into the well, so that the pressure and temperature sensor 50 suspended below the adapter 13 via the connecting wire rope 40 is in the target reservoir 400 downhole.

[0020] In actual implementation, the top and bottom of the short-circuit 20 are threaded with casing 30. The short-circuit 20 and the casing form a supporting oil pipe arranged from the wellhead of the drilling 300 to the bottom of the well. The supporting oil pipe is close to but does not touch the well wall. The number of casing 30 threaded at the top and bottom of the short-circuit 20 is not limited, as long as the pressure and temperature sensor 50 can eventually be located in the target reservoir.

[0021] 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 sleeves without the landing short-circuit 20.

[0022] like Figure 2 The top of the salvage head 11 is provided with a cone head 111, wherein: when performing the dropping operation, the cone head 111 of the salvage head 11 is used to clamp in the salvage tube of the salvage device 100 and is fixed with a copper or aluminum pin, so that during the dropping process, the pin can fall off under the downward high-speed (such as 80m / min) shock, and the landing tool 10 and the pressure and temperature sensor 50 thereunder can be separated from the salvage device 100 and fall down on their own.

[0023] In addition, when performing the salvage operation, the cone head 111 of the salvage head 11 can be inserted into the salvage tube of the salvage device 100 lowered at a low speed (such as 5-15m / min) and then clamped by the salvage tube to salvage the landing tool 10 and the pressure and temperature sensor 50 thereunder and retrieve them out of the well.

[0024] like Figure 2 and Figure 3 The seat 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 uniformly distributed with a plurality of seat wings 121 ( Figure 3 Shows the situation of evenly distributing four landing wings 121); 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 screwing with the sleeve 30.

[0025] During the placement process, the adapter 13 and the pressure and temperature sensor 50 below the seat 12 can pass through the hole 23 formed by the boss 22, but the seating wing 121 is blocked by the boss 22, making it impossible for the seat 12 to pass through the hole 23, so that the seat 12 is stuck in the seating short circuit 20. Figure 5 .

[0026] 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.

[0027] 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 support oil pipe, thereby reducing workload and the chance of rework due to installation errors.

[0028] 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 .

[0029] The utility model performs the process reference of geothermal / dry hot rock well temperature and pressure monitoring Figure 8 To understand, including steps:

[0030] 1) In the open hole stage, the downhole depth of the target reservoir 400 is determined, and the support tubing is fabricated accordingly;

[0031] 2) Lowering the support tubing to the bottom of the well 300 so that the landing short circuit 20 on the support tubing is above the target reservoir 400, so that the pressure and temperature sensor 50 can be located in the target reservoir 400;

[0032] 3) Make 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 6 , the wire rope cap 60 is used to connect with the wire rope operated by the winch;

[0033] 4) Using a winch (with a shock function) deployed on the surface 200, the wire rope is operated to lower the drift tool string (the wire rope is lowered into the well through the wellhead pulley), thereby performing the drift operation. The wire rope is pulled up (10-15 meters) every 500 meters of lowering to test the tension and record it. When the distance from the target reservoir is 400-300 meters, the wire rope is pulled up every 100 meters to test the tension and record it. When the drift reaches the landing short circuit 20 and encounters resistance, the depth data of the landing short circuit 20 is compared with the location of the landing short circuit 20 during the fabrication of the support tubing to ensure the accuracy of the pressure and temperature monitoring position.

[0034] 5) After the dredging operation is completed, lift up and retract the dredging tool string;

[0035] 6) The diameter tool string is converted into the utility model launching tool string, wherein the utility model launching tool string includes a wire rope cap 60 connected up and down, a weight rod 70, a jar 80, a bailer 100, and a landing tool 10, 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 1 ;

[0036] 7) The present invention's launching tool string is lowered by operating the wire rope by a winch, thereby performing the launching operation, wherein: during the process of lowering the present invention's launching tool string, the pressure and temperature data are measured every set depth; the wire rope is pulled up to test the tension and record it every 500m of lowering; when the distance from the landing short circuit 20 to 100m is reached, the wire rope is pulled up to test the tension and record it every 50m; when the distance from the landing short circuit 20 to 50m is reached, the launching tool string 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 separated), then the present invention's launching tool string is lifted up to a position 20m away from the landing short circuit 20, and then repeatedly jarred 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 landing device 100 and fall and sit on the landing short circuit 20, wherein the jarring is stopped when it is confirmed by comparing the wire rope tension that the landing tool 10 has been separated from the landing device 100;

[0037] 8) After the delivery operation is completed, the delivery tool string of the present invention is lifted up and retracted (at this time, the landing tool 10 and the pressure and temperature sensor 50 thereunder are not located);

[0038] 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).

[0039] 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. 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.

[0040] When the pressure and temperature monitoring is completed, the following steps are also performed:

[0041] 9) The casting tool string of the present invention is converted into a scooping tool string, wherein the scooping tool string includes a wire rope cap 60, a weighting rod 70, a jar 80, a centralizer 110 and a casting and scooping device 100 connected in an upper and lower manner, as shown in FIG. Figure 1 ;

[0042] 10) The fishing tool string is lowered by a winch operating a wire rope to perform 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, the fishing tool string is lowered at a speed of 5m / min-15m / min until the wire rope tension decreases by 20kg (indicating that the fishing device 100 is on the landing short circuit 20), then the fishing tool string is lifted to a position 20-20m away from the landing short circuit, wherein the landing tool 10 is confirmed to be clamped in the overshot of the fishing device 100 by comparing the wire rope tension. If the wire rope tension has not decreased by 20kg, the lifting is repeated to a position 20-50m away from the landing short circuit and lowered at a speed of 5m / min-15m / min;

[0043] 11) After the retrieval operation is completed, the retrieval tool string and the seating tool 10 and pressure and temperature sensor 50 held therein are pulled up and retrieved. During the process of lifting the retrieval tool string, the pressure and temperature data are measured once at each set depth.

[0044] In the present invention, the plunger 100, wire rope cap 60, weighting rod 70, jar 80, drift gauge 90, stabilizer 110, casing 30, and pressure and temperature sensor 50 are all existing devices or components in the art. The plunger 100 generally has an overshot at its bottom that matches the cone 111 of the overshot head 11. The overshot can have various structures and is designed to securely hold the inserted cone 111 at low speeds (e.g., 5-15 m / min), thereby allowing the landing tool 10 to be lifted upward. High-speed jarring (e.g., 80 m / min) can disengage the cone 111, and high-speed jarring can also disengage the pins securing the overshot to the overshot head 11. The pressure and temperature sensor 50 typically uses a commercially available pressure gauge, which measures both pressure and temperature.

[0045] The advantages of the utility model are:

[0046] The utility model can place the pressure and temperature sensor in the target reservoir underground for long-term monitoring (half a year to one year) without the need for equipment such as winches on the ground to be detained, thus 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, making cross-operation possible and greatly improving work efficiency. The utility model is suitable for promotion in the field of geothermal resource exploration.

[0047] The utility model is simple, effective and fast in placing the pressure and temperature sensor, has low implementation cost, and can provide stable support for the pressure and temperature sensor, ensuring the accuracy of monitoring and meeting the needs of in-situ temperature and pressure monitoring of underground reservoirs in geothermal wells and hot dry rock wells.

[0048] The above is a preferred embodiment 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, shall fall within the scope of protection of the present invention.

Claims

1. A set of tools for monitoring temperature and pressure in geothermal / hot dry rock wells, characterized by: It includes a wire rope cap, a weighting rod, a jar, a salvage device and a seating tool connected in upper and lower parts, wherein the seating tool is connected to a pressure and temperature sensor through a connecting wire rope, wherein: the seating tool is composed of a salvage head, a seater and an adapter connected in upper and lower parts, the salvage head is used to be connected to the salvage device, the adapter is used to connect the pressure and temperature sensor via the connecting wire rope, the seater is used to be stuck in a seating short circuit arranged in the drilling 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; the seater includes a column, the top of the column is provided with an external thread for being screwed to the salvage head, the hollow bottom end of the column is provided with an internal thread for being screwed to the adapter, and the outer wall of the column is evenly distributed with a plurality of seating wings.

2. The tool string for monitoring temperature and pressure of geothermal / dry hot rock wells according to claim 1, characterized in that: The top of the salvage head is provided with a cone head, wherein: when performing the dropping operation, the cone head of the salvage head is used to clamp in the salvage device and is fixed with a pin, so that during the dropping process, the pin can fall off under the action of downward high-speed shock, and the seating tool and the pressure and temperature sensor thereunder can be separated from the salvage device, and the salvage head can drop automatically.

3. The geothermal / dry hot rock well temperature and pressure monitoring tool string according to claim 2, characterized in that: 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 which are provided with external threads for threaded connection with the sleeve; During the placement process, the adapter and the pressure and temperature sensor under the seat can pass through the hole formed by the boss, but the seating wing is blocked by the boss, making it impossible for the seat to pass through, so that the seat is stuck in the seating short circuit.

4. The tool string for monitoring temperature and pressure of geothermal / dry hot rock wells according to claim 3, characterized in that: The portion on the boss is set as a slope, the portion of the seating wing facing downward is set as a slope, and the upward slope of the boss is adapted to the downward slope 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 tool string for monitoring temperature and pressure of geothermal / dry hot rock wells according to claim 4, characterized in that: The longitudinal section of the boss is in the shape of an inverted isosceles trapezoid.

6. The geothermal / dry hot rock well temperature and pressure monitoring tool string according to claim 1, characterized in that: The top and bottom of the landing short circuit are threaded with casings, and the landing short circuit and the casing form a supporting oil pipe arranged from the drilling wellhead to the bottom of the well.

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