Novel high-temperature and high-pressure measurement-while-drilling system

Abstract

The invention discloses a novel high-temperature and high-pressure measurement-while-drilling system. Comprising a directional bolt, a suspension drill collar, a rotary valve pulser, a double-male centralizer, a centralizing ring, a battery tail wire, a battery cylinder short section, a battery cylinder, a high-temperature-resistant battery pack, an exploring tube short section, a lower plug, a protective cap, a wire pressing plate, a connecting seat, a circuit board buffer, a battery connecting end, a pressure-bearing outer cylinder, a main control short section, a directional sensor and a centralizer short section. The battery cylinder and the pressure-bearing outer cylinder are made of Inconel 718 materials, so that high temperature resistance of 200 DEG C and high pressure resistance of 172 MPa are ensured, and detonation can be prevented; the high-temperature-resistant battery pack provides power for the system; the rotary valve pulser generates pulse signals through drilling fluid, and parameters such as underground temperature and pressure are measured in real time. The directional sensor detects well track and stratum information; and the lower plug has an anti-blocking function. The device is suitable for a deep well high-temperature and high-pressure environment, and has the characteristics of simple structure, automatic measurement, safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling, specifically a novel high-temperature and high-pressure measurement while drilling system. Background Technology

[0002] Accurately describing the wellbore trajectory is crucial for drilling operations. MWD (Measurement While Drilling) systems measure well inclination, tool face, and azimuth parameters to obtain the instrument's current drilling attitude, which is then transmitted wirelessly to the surface. This information is used to describe the wellbore trajectory, making MWD equipment and systems indispensable instruments for oil and gas exploration drilling.

[0003] The geothermal gradient is the rate of temperature increase per unit depth associated with increasing depth within the Earth. In most regions of the world far from plate tectonics, the geothermal gradient near the surface is 25–30°C / km (or 2.5–3°C / 100m). During deep well drilling, the maximum temperature and pressure are calculated based on the geothermal gradient, well depth, and drilling fluid density. The bottom hole circulating temperature typically exceeds 175°C, and the bottom hole pressure exceeds 150 MPa. However, the temperature resistance range of measurement-while-drilling (MWD) instruments is between 125–175°C, and the pressure resistance range is between 120 MPa and 140 MPa, which cannot meet the temperature and pressure resistance requirements of drilling and measurement instruments in high-temperature formations and geothermal wells. Summary of the Invention

[0004] The purpose of this invention is to provide a novel high-temperature and high-pressure measurement while drilling system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this device adopts the following technical solution: a novel high-temperature and high-pressure measurement while drilling system, including but not limited to directional bolts, suspended drill collars, rotary valve pulse generators, double male centralizers, centralizing rings, battery tail wires, battery sleeve subs, battery sleeves, high-temperature resistant battery packs, probe subs, lower plugs, protective caps, pressure plates, connecting seats, circuit board buffers, battery connection terminals, pressure-bearing outer cylinders, main control subs, directional sensors, and centralizer subs.

[0006] The suspended drill collar is controlled by directional bolts to maintain its suspension direction and position. The rotary valve pulser generates pulses by acting on the drilling fluid, and the changes in these pulse signals are analyzed to obtain the changes in downhole drilling parameters such as temperature and pressure. The dual-axis centralizer is a connecting device used to connect the centralizer ring and the rotary valve pulser, as well as the battery and centralizer ring.

[0007] The battery cylinder and pressure-bearing outer cylinder are made of, but are not limited to, Inconel 718 material, ensuring resistance to high temperatures of 200°C and high pressures of 172MPa while completely preventing deflagration. The high-temperature resistant battery pack adopts a high-temperature resistant design, ensuring it can withstand temperatures of 200°C. The series-connected high-temperature resistant battery packs are connected by a battery cylinder short section and a battery tail wire, ensuring unobstructed circuitry and providing power support for the entire drilling measurement system. The battery tail wire is made of explosion-proof material to prevent high-temperature deflagration.

[0008] The protective cap is a connecting and sealing device that connects the upper centralizing ring and the lower battery cylinder, as well as the upper centralizing ring and the lower pressure-bearing outer cylinder, while preventing drilling fluid from entering the battery cylinder and the pressure-bearing outer cylinder. The connecting seat and battery connection end are made of a 200°C high-temperature resistant material, and the pressure plate completely seals the circuit while ensuring its normal operation in the high-temperature underground environment. The circuit board buffer is also made of a 200°C high-temperature resistant material, providing effective protection for the system circuit board during system operation and preventing circuit board failure caused by system vibration.

[0009] The directional sensor can detect the movement direction of the measurement-while-drilling system downhole and detect formation physical information in real time, determine the formation condition, and feed back the movement direction and formation information to the surface personnel in real time to achieve the purpose of measurement-while-drilling. The centralizer sub is a connecting device used to connect the centralizing ring and the pressure-bearing outer cylinder. The lower plug is an anti-clogging device with built-in sensors and plugging agent. After detecting a blockage ahead, it releases the plugging agent in time to clear the blockage.

[0010] The novel high-temperature and high-pressure measurement while drilling system of the present invention includes the following steps: 1. During normal operation, the entire system, consisting of a double centralizer, a centralizing ring, and a protective cap, is connected as a whole and lowered into the wellhead. 2. During the lowering process, the rotary valve pulse generator generates pulse signals by applying pulse signals to the drilling fluid. The changes in these pulse signals are then analyzed to obtain the changes in downhole drilling parameters such as temperature and pressure. The data is fed back to the surface personnel in real time for the purpose of measurement while drilling. 3. As the drilling measurement system (MWS) is deployed, its directional sensors can detect drilling information such as the direction of movement, inclination, rotation speed, and trajectory of the drilled section in real time. By analyzing the temperature and pressure changes of the drilling fluid, it can determine formation information such as formation temperature, porosity, and formation density, and feed this drilling and formation information back to the surface personnel in real time for the evaluation of formation properties and hydrocarbon content, thus achieving the purpose of MWS measurement and detection. 4. As the lowering process proceeds, the formation pressure and temperature gradually increase. The protective cap, battery cylinder, and pressure-bearing outer cylinder completely isolate the external high temperature and pressure, ensuring that the system can operate effectively under high temperature of 200°C and high pressure of 172MPa. 5. As the lowering process proceeds, if a blockage is detected ahead, the lowering head can promptly release the lowering agent to clear the blockage; 6. After the entire measurement while drilling operation is completed, the entire measurement while drilling system will be retrieved from the borehole, disassembled, and cleaned for future use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a novel high-temperature and high-pressure measurement while drilling system according to the present invention; Figure 2 This is a schematic diagram of a battery short section for a novel high-temperature and high-pressure measurement while drilling system according to the present invention; Figure 3 This is a schematic diagram of the probe section structure of a novel high-temperature and high-pressure measurement while drilling system according to the present invention; Figure 4 This is a schematic diagram of the probe section structure of a novel high-temperature and high-pressure measurement while drilling system according to the present invention; Reference numerals: 1. Orientation bolt, 2. Suspension drill collar, 3. Rotary valve pulser, 4. Double male centralizer, 5. Centralizer ring, 6. Battery tail wire, 7. Battery tube short section, 8. Battery tube, 9. High temperature resistant battery pack, 10. Probe short section, 11. Lower plug, 12. Protective cap, 13. Pressure plate, 14. Connecting seat, 15. Circuit board buffer, 16. Battery connection end, 17. Pressure-bearing outer cylinder, 18. Main control short section, 19. Orientation sensor, 20. Centralizer short section. Detailed Implementation

[0012] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0013] Specific embodiments of the present invention are described below with reference to the accompanying drawings. Example

[0014] This invention provides, for example Figure 1 The present invention discloses a novel high-temperature and high-pressure measurement while drilling system. The purpose of this invention is to provide a novel MWD system that can withstand high temperatures of 200°C and high pressures of 172MPa to solve the problems mentioned in the background art.

[0015] To achieve the above objectives, this device adopts the following technical solution: a novel high-temperature and high-pressure MWD system, including but not limited to: 1. directional bolt, 2. suspended drill collar, 3. rotary valve pulser, 4. double male centralizer, 5. centralizer ring, 6. battery tail wire, 7. battery cylinder short section, 8. battery cylinder, 9. high-temperature resistant battery pack, 10. probe short section, 11. lower plug, 12. protective cap, 13. wire clamping plate, 14. connecting seat, 15. circuit board buffer, 16. battery connection end, 17. pressure-bearing outer cylinder, 18. main control short section, 19. directional sensor, and 20. centralizer short section.

[0016] The suspended drill collar 2 is controlled by the directional bolt 1 to maintain its suspension direction and position. The rotary valve pulser 3 generates pulses by acting on the drilling fluid, and the changes in these pulse signals are used for calculation and analysis to obtain the changes in downhole drilling parameters such as temperature and pressure. The double centralizer 4 is a connecting device that can be used to connect the centralizer ring 5 and the rotary valve pulser 3, the battery cylinder 8 and the centralizer ring 5.

[0017] The battery cylinder 8 and the pressure-bearing outer cylinder 17 are made of, but are not limited to, Inconel 718 material, ensuring high temperature resistance of 200°C and high pressure resistance of 172MPa while completely preventing deflagration. The high-temperature resistant battery pack 9 adopts a high-temperature resistant battery pack design, which can withstand a high temperature of 200°C. The series-connected high-temperature resistant battery pack is connected by the battery cylinder short section 6 and the battery tail wire 5 to ensure unobstructed circuitry and provide power support for the entire MWD system. The battery tail wire 6 is made of anti-deflagration material to prevent high-temperature deflagration.

[0018] The protective cap 12 is a connecting and sealing device that connects the upper centralizing ring 5 and the lower battery cylinder 8, as well as the upper centralizing ring 5 and the lower pressure-bearing outer cylinder 17, while preventing drilling fluid from entering the battery cylinder 8 and the pressure-bearing outer cylinder 17. The connecting seat 14 and the battery connection end 16 are made of materials resistant to high temperatures up to 200°C. The pressure plate 13 completely seals the circuit while ensuring normal operation of the circuit in the high-temperature underground environment. The circuit board buffer 15 is made of materials resistant to high temperatures up to 200°C, which can effectively protect the system circuit board during system operation and prevent circuit board failure caused by system vibration.

[0019] The orientation sensor 19 can detect the movement direction of the MWD system downhole and detect formation physical information in real time, determine the formation state, and feed back the movement direction and formation information to the surface personnel in real time for the purpose of measurement while drilling. The centralizer sub 20 is a connecting device that can be used to connect the centralizer ring 5 and the pressure-bearing outer cylinder 17. The lower plug 11 is an anti-blocking device with built-in sensors and plugging agent. After detecting a blockage ahead, it releases the plugging agent in time to clear the blockage.

[0020] The novel high-temperature and high-pressure MWD system of this invention includes the following steps: 1. During normal operation, the entire system, consisting of the double centralizer 4, centralizer ring 5, and protective cap 12, is connected as a whole and lowered into the wellhead as a single unit; 2. During the lowering process, the rotary valve pulser 3 generates a pulse signal by applying a pulse signal to the drilling fluid. The changes in the pulse signal are then calculated and analyzed to obtain the changes in downhole drilling parameters such as temperature and pressure. The data is then fed back to the surface personnel in real time for the purpose of measurement while drilling. 3. As the deployment process proceeds, the MWD system orientation sensor 19 can detect drilling information such as the direction of movement, inclination, rotation speed, and trajectory of the drilled section of the MWD system downhole in real time. By analyzing the temperature and pressure changes of the drilling fluid, it can determine formation information such as formation temperature, porosity, and formation density, and feed back this drilling and formation information to the surface personnel in real time for the evaluation of formation physical properties and oil and gas content, so as to achieve the purpose of measurement while drilling and detection. 4. As the lowering process proceeds, the formation pressure and temperature gradually increase. The protective cap 12, battery cylinder 8, and pressure-bearing outer cylinder 17 completely isolate the external high temperature and high pressure, ensuring that the system can operate effectively under high temperature of 200°C and high pressure of 172MPa. 5. As the lowering process proceeds, if a blockage is detected ahead, the lower plug 11 can promptly release the lower plugging agent to clear the blockage; 6. After the entire measurement while drilling (MWD) operation is completed, the entire MWD system will be removed from the borehole, disassembled, and cleaned for future use.

Claims

1. A novel high-temperature and high-pressure measurement while drilling system, comprising a directional bolt (1), a suspended drill collar (2), a rotary valve pulser (3), a double-male centralizer (4), a centralizer ring (5), a battery tail wire (6), a battery sleeve short section (7), a battery sleeve (8), a high-temperature resistant battery pack (9), a probe short section (10), a lower plug (11), a protective cap (12), a pressure plate (13), a connecting seat (14), a circuit board buffer (15), a battery connection end (16), a pressure-bearing outer cylinder (17), a main control short section (18), a directional sensor (19), and a centralizer short section (20), characterized in that: The battery cylinder (8) and the pressure-bearing outer cylinder (17) are made of Inconel 718 material, which is resistant to high temperature of 200°C and high pressure of 172MPa; the high temperature resistant battery pack (9) is installed inside the battery cylinder (8) to provide power to the system; the rotary valve pulser (3) generates pulse signals through drilling fluid to measure downhole temperature and pressure parameters; the orientation sensor (19) is used to detect the downhole movement direction, well inclination, rotation speed, drilled section trajectory and formation information in real time.

2. The novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The suspended drill collar (2) is controlled by a directional bolt (1) to control the suspension direction and position.

3. The novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The double-headed centralizer (4) is used to connect the centralizer ring (5) and the rotary valve pulse generator (3), the battery cylinder (8) and the centralizer ring (5).

4. The novel high-temperature and high-pressure measurement while drilling system according to claim 1, characterized in that: The cap (12) is a connecting sealing device used to connect the upper straightening ring (5) and the lower battery cylinder (8) as well as the upper straightening ring (5) and the lower pressure outer cylinder (17), and to prevent drilling fluid from entering the battery cylinder (8) and the pressure outer cylinder (17).

5. The novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The connector (14) and battery connector (16) are made of high-temperature resistant material (200°C) and the circuit is sealed by the pressure plate (13).

6. The novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The circuit board buffer (15) is made of a high-temperature material resistant to 200°C and is used to protect the system circuit board from vibration.

7. The novel high-temperature and high-pressure measurement while drilling system according to claim 1, characterized in that: The lower plug (11) has a built-in sensor and a lower plugging agent, which releases the lower plugging agent to clear blockages when a blockage is detected.

8. The novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The battery tail wire (6) is made of explosion-proof and flame-retardant material.

9. A novel high-temperature and high-pressure measurement-while-drilling system according to claim 1, characterized in that: The straightener section (20) is used to connect the straightening ring (5) and the pressure-bearing outer cylinder (17).

10. A method for using a novel high-temperature and high-pressure measurement-while-drilling system, characterized in that: Includes the following steps: Step 1: Connect the system as a whole through the double centralizer (4), centralizer ring (5), and protective cap (12), and lower it into the wellhead; Step 2: During the lowering process, the rotary valve pulse generator (3) generates pulse signals through the drilling fluid to measure downhole parameters and feed them back to the surface; Step 3: Real-time detection of movement direction, well inclination, rotation speed, drilled section trajectory and formation information using directional sensors (19); Step 4: Use the protective cap (12), battery tube (8), and pressure-bearing outer tube (17) to isolate the external high temperature and high pressure, and ensure that the system operates at 200°C and 172MPa; Step 5: When the lower plug (11) detects a blockage, release the lower plugging agent to clear it; Step Six: After the measurement is completed, remove the system from the well.

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