CN220285737U - Geothermal underground pressure measurement nipple while drilling - Google Patents

Abstract

The utility model relates to a geothermal pressure measurement nipple under a well, which comprises a drill collar connected with a drill rod, wherein a drilling fluid channel is arranged in the drill collar, a sensor connector is arranged in the drill collar, a first through hole communicated with the drilling fluid channel is arranged on the sensor connector, a first pressure sensor and a second pressure sensor are arranged at one end of the sensor connector, a sensor protection cylinder covering the first pressure sensor and the second pressure sensor is arranged at the end part of the sensor connector, and an outer protection cylinder connected with the sensor connector is arranged at the outer side of the sensor protection cylinder; the sensor connector is respectively provided with an internal pressure introduction hole connected with the first pressure sensor and an external pressure introduction hole connected with the second pressure sensor. The utility model can accurately and reliably acquire underground pressure data in the drilling process, effectively solves the problem of inaccurate measurement caused by vibration and environmental interference of the traditional device, improves the efficiency and safety of drilling operation, and is suitable for wide popularization and use.

Description

A geothermal downhole pressure measurement nipple while drilling

Technical field

The utility model relates to a pressure measurement nipple, in particular to a geothermal downhole pressure measurement nipple while drilling, which belongs to the technical field of downhole measurement equipment.

Background technique

Accurate measurement of downhole pressure is one of the key tasks during geothermal exploration and drilling. However, traditional geothermal downhole measurement devices have some technical difficulties when faced with vibration and environmental interference, such as inaccurate measurements and device damage.

The vibration problem of the traditional device is mainly caused by the vibration between the drill collar and the formation during the drilling process. Due to the influence of the power of the drilling operation and the characteristics of the formation, the device is easily disturbed by vibration. On the one hand, the vibration can easily cause damage to the device, and on the other hand, the vibration can easily cause damage to the device. On the one hand, the vibration process can easily cause problems with the sealing of the device, leading to inaccurate measurement data. In addition, complex conditions such as high temperature and high pressure in the underground environment also pose challenges to the stability and reliability of the device.

In order to overcome these problems, a new type of geothermal downhole pressure measurement nipple while drilling needs to be introduced to provide stable, accurate and reliable downhole geothermal pressure measurement.

Utility model content

The utility model mainly aims at the above-mentioned problems existing in the existing technology and provides a geothermal downhole pressure measuring sub-joint while drilling. The pressure measuring sub-joint has good vibration resistance, good sealing and corrosion resistance, and can adapt to harsh conditions. underground environment, and achieve accurate measurement and collection of pressure.

The purpose of this utility model is mainly achieved through the following solutions:

A geothermal downhole pressure measurement sub-joint, which includes a drill collar connected to a drill pipe. A drilling fluid channel is provided inside the drill collar, and a sensor joint is installed in the drill collar. The sensor joint is provided with a drilling fluid channel. A first through hole that communicates with the liquid channel, a first pressure sensor and a second pressure sensor are installed at one end of the sensor joint, and the end of the sensor joint is provided with a sensor protection tube covering the first pressure sensor and the second pressure sensor, The outer side of the sensor protection cylinder is provided with an outer protection cylinder connected to the sensor joint; the sensor joint is provided with an internal pressure introduction hole connected to the first pressure sensor and an external pressure introduction hole connected to the second pressure sensor. hole.

Preferably, one end of each of the first pressure sensor and the second pressure sensor is provided with a sensor interface, and the two sensor interfaces are threadedly connected to the internal pressure introduction hole and the external pressure introduction hole respectively.

Preferably, the two ends of the internal pressure introduction hole penetrate through both end surfaces of the sensor joint respectively, and the two ends of the external pressure introduction hole penetrate through one end surface and side wall of the sensor joint respectively.

Preferably, the side wall of the drill collar is provided with a second through hole connected to the external pressure introduction hole, the inner wall of the drill collar is provided with a step that is in contact with one end surface of the sensor joint, and one side of the step is provided with a limiting boss. The outer side wall of the sensor joint is provided with a limiting groove that matches the limiting boss.

Preferably, the outer wall of the end of the sensor joint away from the outer protective cylinder is provided with a plurality of first annular sealing grooves, and a sealing ring is filled between the first annular sealing grooves and the inner wall of the drill collar.

Preferably, the outer wall of one end of the sensor joint connected to the outer protection cylinder is provided with an end face sealing groove and a plurality of second annular sealing grooves, the end face sealing groove is in contact with one end surface of the outer protection cylinder, and the second annular sealing groove A sealing ring is filled between it and the inner wall of the outer protective cylinder.

Preferably, a baffle is provided inside the outer protective cylinder, and a buffer block is provided between the baffle and the sensor protective cylinder.

Therefore, compared with the prior art, the present utility model has the following advantages:

(1) Through the sensor joint provided, the utility model is not only used to install the first pressure sensor and the second pressure sensor, but also realizes the radial support and circumferential and axial positioning of the entire measuring sub-section. The upper limit of the sensor joint is The cooperation between the position groove and the upper limit boss of the drill collar ensures that the external pressure introduction hole connected to the first pressure sensor is connected to the second through hole on the drill collar, and the positioning is accurate;

(2) This utility model uses an internal pressure introduction hole and an external pressure introduction hole provided on the sensor joint. The internal pressure introduction hole is connected with the drilling fluid channel in the drill collar to measure the pressure in the drill collar. The external pressure introduction hole is used to measure the pressure in the drill collar. The hole is connected to the second through hole on the drill collar and is used to measure the pressure in the annulus, so that the pressure measuring sub can measure pressure changes at different locations at the same time and provide more comprehensive pressure data;

(3) Through the first annular sealing groove, the second annular sealing groove and the end sealing groove provided on the sensor joint, and the use of sealing rings, the utility model can ensure effective sealing inside the pressure measuring sub-joint to prevent underground leakage. Liquid or gas leaks into the measuring nipple and affects the measurement results;

(4) The utility model is provided with an outer protection cylinder and a sensor tube protection cylinder. The outer protection cylinder can prevent the first sensor and the second sensor from being damaged by the underground environment. The sensor tube protection cylinder is installed in the outer protection cylinder for further protection. The first sensor and the second sensor have good protection effect, and the outer protective cylinder is also equipped with a buffer block, which plays a good buffering and vibration reduction role, effectively protects the measuring device from the influence of the underground environment and vibration, and improves measurement Accuracy and reliability.

Description of drawings

Figure 1 is a structural schematic diagram of the utility model;

Figure 2 is a cross-sectional view of the utility model;

Figure 3 is an enlarged view of point A in Figure 2;

Figure 4 is an enlarged view of B in Figure 2;

Figure 5 is a schematic structural diagram of the sensor joint in the utility model;

Figure 6 is a schematic diagram of the connection between the sensor connector and the first sensor and the second sensor in the present invention.

Illustration: 1-drill collar, 2-drilling fluid channel, 3-sensor connector, 4-first through hole, 5-first pressure sensor, 6-second pressure sensor, 7-sensor protection tube, 8-outer Protective cylinder, 9-internal pressure introduction hole, 10-external pressure introduction hole, 11-sensor interface, 12-second through hole, 13-step, 14-limiting boss, 15-limiting groove, 16-first Annular sealing groove, 17-end sealing groove, 18-second annular sealing groove, 19-baffle, 20-cushion block.

Detailed ways

The technical solution of the present utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present utility model is not limited to the following embodiments, and any formal modifications and/or changes made to the present utility model will fall within the protection scope of the present utility model.

In the present invention, unless otherwise specified, all parts and percentages are units of weight, and the equipment and raw materials used can be purchased from the market or are commonly used in this field. The methods in the following examples are all conventional methods in the art unless otherwise specified. Unless otherwise specified, the components or equipment in the following embodiments are all universal standard parts or components known to those skilled in the art. Their structures and principles can be known by those skilled in the art through technical manuals or through routine experimental methods. .

Example 1:

As shown in Figures 1 and 2, the present utility model provides a technical solution, a geothermal downhole pressure measurement nipple while drilling, including a drill collar 1 connected to a drill pipe, and a drilling fluid channel 2 is provided inside the drill collar 1. And a sensor joint 3 is installed in the drill collar 1. The sensor joint 3 is provided with a first through hole 4 communicating with the drilling fluid channel. A first pressure sensor 5 and a second pressure sensor 6 are installed at one end of the sensor joint 3, and the sensor The end of the joint 3 is provided with a sensor protection tube 7 covering the first pressure sensor 5 and the second pressure sensor 6. The outside of the sensor protection tube 7 is provided with an outer protection tube 8 connected to the sensor joint 3; the sensor joint 3 is provided with There is an internal pressure introduction hole 9 connected to the first pressure sensor 5 and an external pressure introduction hole 10 connected to the second pressure sensor 6 .

The above drill collar 1 is used to connect to the drill pipe and transmit rotational power. The drill collar 1 is made of high-strength alloy steel and has excellent rigidity and pressure resistance to withstand the high pressure and vibration load in the downhole environment. The drill collar 1 It has the function of transmitting drilling fluid pressure, and transmits the pressure from the drilling fluid to the first pressure sensor 5 for measurement. At the same time, the end of the drill collar 1 usually adopts threaded connection or other mechanical connection methods to ensure safe and reliable connection with other downhole tools and equipment to ensure the stability of the sensor joint 3, the outer protection tube 8, and the sensor protection tube 7.

In this embodiment, the sensor joint 3 is integrally formed by a cylinder at the left end and a cylinder at the right end, and the diameter of the cylinder at the left end is larger than the diameter of the cylinder at the right end. The first through hole 4 is located on the cylinder at the left end and along the sensor There are four joints 3 evenly arranged in the axial direction. The outer wall of the left end of the sensor joint 3 is in contact with the inner wall of the drill collar 1, and they are connected to each other through threads or other mechanical connections. For example, the outer wall of the left end of the sensor joint 3 is provided with multiple Locking hole, the locking pin passes through the drill collar 1 and is threadedly connected to the locking hole to achieve the fixation of the sensor joint 3 and the drill collar 1.

The outer protection tube 8 is connected to one end of the sensor connector 3, and the other end of the outer protection tube 8 is partially connected to the circuit board. Its function is to isolate the contact between the internal components and the drilling fluid to protect the integrity of the internal components. The barrel 8 is made of corrosion-resistant materials, such as stainless steel or special alloys, to resist the erosion of chemicals and particles in the underground environment; the above-mentioned circuit board part is electrically connected to the first sensor and the second sensor, and the circuit board part is not included in this application. Within the scope of protection, no further details will be given here.

Example 2:

As shown in Figures 2, 5, and 6, the present utility model provides another technical solution, a geothermal downhole pressure measurement nipple while drilling. The difference from Embodiment 1 is that the first pressure sensor 5 and the second pressure sensor The left end of the sensor 6 is provided with a sensor interface 11, and the two sensor interfaces 11 are threadedly connected to the internal pressure introduction hole 9 and the external pressure introduction hole 10 respectively to achieve reliable mechanical connection and ensure the stability and tightness of the connection.

Specifically, the two ends of the internal pressure introduction hole 9 penetrate through both end surfaces of the sensor joint 3 respectively, and the two ends of the external pressure introduction hole 10 penetrate through one end surface and side wall of the sensor joint 3 respectively; the internal pressure introduction hole 9 passes through the pup joint. The drilling fluid channels are connected and used to measure the pressure in the drill collar; the side wall of the drill collar 1 is provided with a second through hole 12 that is connected to the external pressure introduction hole 10 and is used to measure the annular pressure.

Specifically, the inner wall of the drill collar 1 is provided with a step 13 that is in contact with the left end surface of the sensor joint 3, and one side of the step 13 is integrally provided with a limiting boss 14, and the outer wall of the sensor joint 3 is provided with a limiting boss 14. Adapted limit groove 15. When installing the sensor joint 3, rotate the sensor joint 3 so that the limit groove 15 on the sensor joint 3 matches the limit boss 14 on the drill collar 1 to ensure that the external pressure on the second pressure sensor is introduced. The hole is connected with the second through hole 12 on the drill collar.

The above-mentioned first pressure sensor 5 and second pressure sensor 6 both use titanium/silicon-sapphire pressure sensors, which have high precision and high sensitivity and can effectively measure changes in downhole pressure.

Example 3:

As shown in Figures 2, 3, and 4, the present utility model provides another technical solution, a geothermal downhole pressure measurement nipple while drilling. The difference from Embodiment 1 is that the left end outer wall of the sensor joint 3 is provided with multiple There is a first annular sealing groove 16, and an O-ring is filled between the first annular sealing groove 16 and the inner wall of the drill collar 1, which has good sealing performance.

Specifically, the right end outer wall of the sensor joint 3 is provided with an end face sealing groove 17 and a plurality of second annular sealing grooves 18. The end face sealing groove 17 is in contact with the left end face of the outer protection cylinder 8, and the second annular sealing groove 18 is in contact with the outer protection cylinder 8. The inner walls of the cylinder 8 are filled with O-rings. In this embodiment, the outer protection cylinder 8 and the right end of the sensor connector 3 are connected by threads.

Specifically, the outer protection cylinder 8 is provided with a baffle 19 inside, and a buffer block 20 is filled between the baffle 19 and the sensor protection cylinder 7. The sensor protection cylinder 7 and the buffer block 20 are both made of rubber and have good attenuation. vibration effect.

The utility model provides a geothermal downhole pressure measurement sub-joint while drilling. Through the sensor joint provided, it is not only used to install the first pressure sensor and the second pressure sensor, but also realizes the radial support and circumferential support of the entire measuring sub-joint. Positioning in the direction and axial direction, through the cooperation of the upper limit groove of the sensor joint and the upper limit boss of the drill collar, ensures that the external pressure introduction hole connected to the first pressure sensor is connected to the second through hole on the drill collar, and the positioning is accurate; by setting There are an internal pressure introduction hole and an external pressure introduction hole on the sensor joint. The internal pressure introduction hole is connected to the drilling fluid channel in the drill collar and is used to measure the pressure in the drill collar. The external pressure introduction hole is connected to the second hole on the drill collar. The through-hole connection is used to measure the pressure in the annulus, so that the pressure measuring nipple can measure pressure changes at different locations at the same time and provide more comprehensive pressure data; through the first annular sealing groove and the second annular seal provided on the sensor joint Groove and end face sealing groove, combined with the use of sealing rings, can ensure effective sealing inside the pressure measuring sub-joint to prevent downhole liquid or gas from leaking into the inside of the measuring sub-joint and affecting the measurement results; through the set outer protective cylinder and sensor tube Protective cylinder. The outer protective cylinder can prevent the first sensor and the second sensor from being damaged by the underground environment. The sensor tube protective cylinder is installed in the outer protective cylinder to further protect the first sensor and the second sensor. It has a good protective effect, and A buffer block is also installed in the outer protective cylinder, which plays a good buffering and vibration-absorbing role, effectively protects the measuring device from the influence of the underground environment and vibration, and improves measurement accuracy and reliability.

It should be understood that this embodiment is only used to illustrate the present invention and is not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teaching content of the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims (7)

1. A geothermal downhole pressure measurement nipple while drilling, characterized by: including a drill collar (1) connected to a drill pipe, a drilling fluid channel is provided inside the drill collar (1), and the drill collar (1) A sensor joint (3) is installed inside. The sensor joint (3) is provided with a first through hole (4) that communicates with the drilling fluid channel. A first pressure sensor (5) and a first pressure sensor (5) are installed at one end of the sensor joint (3). The second pressure sensor (6), and the end of the sensor joint (3) is provided with a sensor protection tube (7) covering the first pressure sensor (5) and the second pressure sensor (6). The sensor protection tube (7) is provided with an outer protective tube (8) connected to the sensor joint (3) on the outside; the sensor joints (3) are respectively provided with internal pressure introduction holes (9) connected to the first pressure sensor (5). ) and an external pressure introduction hole (10) connected to the second pressure sensor (6). 2. A geothermal downhole pressure measurement nipple while drilling according to claim 1, characterized in that: one end of the first pressure sensor (5) and the second pressure sensor (6) is provided with a sensor interface (11 ), the two sensor interfaces (11) are threadedly connected to the internal pressure introduction hole (9) and the external pressure introduction hole (10) respectively. 3. A geothermal downhole pressure measurement nipple while drilling according to claim 2, characterized in that: the two ends of the internal pressure introduction hole (9) respectively penetrate the two end surfaces of the sensor joint (3), and the outer The two ends of the pressure introduction hole (10) penetrate one end surface and side wall of the sensor connector (3) respectively. 4. A geothermal downhole pressure measurement nipple while drilling according to claim 3, characterized in that: the side wall of the drill collar (1) is provided with a second through hole connected to the external pressure introduction hole (10) (12), the inner wall of the drill collar (1) is provided with a step (13) in contact with one end surface of the sensor joint (3), and a limiting boss (14) is provided on one side of the step (13), and the sensor joint (3) 3) The outer wall is provided with a limiting groove (15) that matches the limiting boss (14). 5. A geothermal downhole pressure measurement nipple while drilling according to claim 1, characterized in that: the outer wall of one end of the sensor joint (3) away from the outer protection cylinder (8) is provided with a plurality of first annular seals groove (16), and a sealing ring is filled between the first annular sealing groove (16) and the inner wall of the drill collar (1). 6. A geothermal downhole pressure measurement nipple while drilling according to claim 2, characterized in that: the outer wall of one end of the sensor joint (3) connected to the outer protection cylinder (8) is provided with an end seal groove (17) ) and a plurality of second annular sealing grooves (18), the end sealing groove (17) is in contact with one end surface of the outer protection cylinder (8), and the second annular sealing groove (18) is in contact with an end surface of the outer protection cylinder (8) There are sealing rings filled between the inner walls. 7. A geothermal downhole pressure measurement sub-joint according to claim 6, characterized in that: a baffle (19) is provided inside the outer protection cylinder (8), and the baffle (19) and the There are buffer blocks (20) between the sensor protection tubes (7).