While-drilling pressure detection probe

Abstract

The utility model discloses a while-drilling pressure detection probe tube, which is characterized by comprising a probe tube body, and the probe tube body comprises an upper joint, a PCB (printed circuit board) shell, an extension cylinder and a lower joint which are connected with one another; a PCB assembly is axially arranged in the middle of the PCB shell; an outer pressure inlet channel and an inner pressure inlet channel are respectively arranged in the PCB shell; a first balance piston assembly and a first pressure sensor are arranged at the tail end of the outer pressure inlet channel; an anti-scouring filter screen is arranged at an inlet of the inner pressure inlet channel, and a second balance piston assembly and a second pressure sensor are arranged at the tail end of the inner pressure inlet channel; a sealing structure is arranged outside the PCB shell, and pressure inlets of the outer pressure inlet channel and the inner pressure inlet channel are separated through the sealing structure. The device is simple in structure and convenient to manufacture and assemble. The balance piston body is used for isolating external rock debris, so that pressure detection is realized; in addition, an anti-scouring filter screen is additionally arranged at the pressure detection port to prevent the pressure detection port from being damaged by scouring. In conclusion, through the improvement, the device is safe and reliable in work and has practicability and economical efficiency.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling measurement and control, specifically to a drilling pressure detection probe. Background Technology

[0002] In oil drilling operations, bottom hole pressure is one of the most important downhole parameters, especially real-time bottom hole pressure parameters during drilling. Based on these parameters, it is possible to promptly identify complex downhole conditions such as lost circulation, blowouts, and kicks. Furthermore, it is possible to calculate the equivalent circulating density of drilling mud based on the real-time pressure parameters, thereby monitoring changes in mud properties and optimizing drilling parameters. In summary, timely, accurate, and high-precision acquisition of bottom hole pressure parameters can help improve drilling speed and promptly identify the presence of lost circulation, blowouts, and kick risks, ensuring well control safety. This utility model, a drilling pressure detection probe, can meet these requirements.

[0003] For example, Chinese patent CN201710706425.8 describes placing the pressure sensor on the mud pipe at the wellhead. However, the downhole working environment is characterized by high temperatures, high vibrations, high erosion, and a large amount of cuttings. Conventional drilling pressure monitoring probes suffer from problems in practical applications, such as the pressure sensor easily getting clogged by cuttings and the internal pressure inlet being easily eroded by high-speed mud. Utility Model Content

[0004] To overcome the aforementioned shortcomings of the prior art, the purpose of this utility model is to provide a drilling pressure detection probe. This utility model addresses the problems of conventional drilling pressure detection probes in practical applications, such as the pressure sensor being easily clogged by rock cuttings and the internal pressure inlet being easily eroded by high-speed drilling mud.

[0005] This invention achieves pressure detection by adding a balance piston body inside the pressure inlet to isolate external rock debris from the pressure sensor; in addition, an anti-erosion filter is added to the pressure detection port to prevent the pressure detection port from being damaged by erosion.

[0006] To achieve the objective of this utility model, the technical solution adopted is as follows:

[0007] A drilling pressure testing probe includes a probe body, the probe body including a connected upper connector, a PCB housing, an extension tube and a lower connector;

[0008] A PCB assembly is axially arranged in the middle of the PCB housing;

[0009] An external pressure channel and an internal pressure channel are respectively provided inside the PCB housing;

[0010] A first balance piston assembly and a first pressure sensor are provided at the end of the external pressure channel;

[0011] An anti-erosion filter screen is provided at the inlet of the internal pressure channel, and a second balance piston assembly and a second pressure sensor are provided at the end of the internal pressure channel.

[0012] A sealing structure is provided on the outside of the PCB housing to separate the pressure inlets of the external pressure inlet channel and the internal pressure inlet channel.

[0013] In a preferred embodiment of this utility model, the first balance piston assembly is a first balance piston body provided with a first sealing ring. The first balance piston body is installed at the end of the external pressure channel. The balance piston body has a groove structure in the middle, and the first sealing ring is disposed in the middle groove. Silicone grease is filled between the front end of the first balance piston body and the external pressure channel.

[0014] Hydraulic oil is filled between the rear end of the first balance piston and the first pressure sensor.

[0015] In a preferred embodiment of this invention, the second balance piston assembly is a second balance piston body equipped with a second sealing ring. The second balance piston body is installed at the end of the inner pressure inlet channel. The second balance piston body has a groove structure in the middle, and the second sealing ring is disposed within the groove. Silicone grease is filled between the front end of the second balance piston body and the inner pressure inlet channel, and hydraulic oil is filled between the rear end of the second balance piston body and the second pressure sensor.

[0016] In a preferred embodiment of this utility model, the sealing structure is a sealing ring disposed in the sealing groove of the PCB housing.

[0017] In a preferred embodiment of this utility model, the upper connector, PCB housing, extension tube and lower connector are sequentially threaded together.

[0018] In a preferred embodiment of this utility model, the middle part of the extension tube has a variable diameter structure.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention achieves pressure detection by adding a balance piston body inside the pressure inlet to isolate external rock debris from the pressure sensor; in addition, an anti-erosion filter is added to the pressure detection port to prevent the pressure detection port from being damaged by erosion. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0023] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0024] Figure 4 This is a partial structural diagram of the present invention. Figure 2 .

[0025] Figure 5 This is a schematic diagram of the piston assembly structure of this utility model.

[0026] Figure 6 This is a schematic diagram of the sensor structure of this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] like Figure 1-4 The drill-while-drilling pressure testing probe shown includes a probe body, which comprises an upper connector 11, a PCB housing 13, an extension tube 19, and a lower connector 20 connected together. The upper connector 11, PCB housing 13, extension tube 19, and lower connector 20 are sequentially threaded together. The extension tube 19 has a variable diameter structure in the middle.

[0030] A PCB assembly 12 is axially arranged in the middle of the PCB housing 13. An external pressure inlet channel 14 and an internal pressure inlet channel 22 are respectively arranged inside the PCB housing 13. A sealing structure 21 is provided on the outside of the PCB housing to separate the pressure inlets of the external pressure inlet channel 14 and the internal pressure inlet channel 22. The sealing structure is a sealing ring provided in a sealing groove 131 on the outside of the PCB housing 13.

[0031] Key points combined Figure 1 and Figure 3 A first balance piston assembly 16 and a first pressure sensor 18 are provided at the end of the external pressure channel 14.

[0032] The first balance piston assembly 16 is used to isolate external rock cuttings while enabling the first pressure sensor 18 to detect the external pressure of the drilling mud outside the drill string.

[0033] by Figure 5 For example, the first balance piston assembly 16 is a first balance piston body 162 with a first sealing ring 161. The first balance piston body 162 is installed at the end of the external pressure channel 14. The balance piston body has a groove structure in the middle. The first sealing ring 161 is set in the middle groove. The front end of the first balance piston body 162 and the external pressure channel 14 are filled with silicone grease 15.

[0034] Hydraulic oil 25 is filled between the rear end of the first balance piston body 162 and the first pressure sensor 18.

[0035] An anti-erosion filter 23 is installed at the inlet of the internal pressure channel 22, and a second balance piston assembly 17 and a second pressure sensor 24 are installed at the end of the internal pressure channel 22. The second balance piston assembly 17 is used to isolate external rock cuttings while enabling the second pressure sensor 24 to detect the internal pressure of the mud flow channel inside the drill collar.

[0036] Figure 5 Taking the first balancing piston 162 as an example, the second balancing piston 17 has the same structure as the first balancing piston 162.

[0037] The second balance piston assembly 17 is a second balance piston body with a second sealing ring. The second balance piston body is installed at the end of the inner pressure channel 22. The second balance piston body has a groove structure in the middle. The second sealing ring is set in the middle groove. Silicon grease 15 is filled between the front end of the second balance piston body and the inner pressure channel 22.

[0038] Hydraulic oil 25 is filled between the rear end of the second balance piston and the second pressure sensor 24. Because of the above structure, the working principle of this utility model is as follows: Figure 4 After the drilling pressure detection probe shown is installed into the special drill collar, the mud channel inside the drill collar is filled with mud. The mud flows into the internal pressure channel 200 and then into the internal pressure channel 22, where the internal pressure is detected by the second pressure sensor 24.

[0039] like Figure 3 The drill string shown is filled with mud. The mud flows into the external pressure inlet 301 of the drill string and through the external pressure channel 300 to the external pressure channel 14. The external pressure is detected by the first pressure sensor 18.

Claims

1. A drilling pressure monitoring probe, characterized in that, It includes a probe body, which includes a connected upper connector, a PCB housing, an extension tube, and a lower connector. A PCB assembly is axially arranged in the middle of the PCB housing; An external pressure channel and an internal pressure channel are respectively provided inside the PCB housing; A first balance piston assembly and a first pressure sensor are provided at the end of the external pressure channel; An anti-erosion filter screen is provided at the inlet of the internal pressure channel, and a second balance piston assembly and a second pressure sensor are provided at the end of the internal pressure channel. A sealing structure is provided on the outside of the PCB housing to separate the pressure inlets of the external pressure inlet channel and the internal pressure inlet channel.

2. The drilling pressure monitoring probe as described in claim 1, characterized in that, The first balance piston assembly is a first balance piston body equipped with a first sealing ring. The first balance piston body is installed at the end of the external pressure channel. The balance piston body has a groove structure in the middle, and the first sealing ring is disposed in the middle groove. Silicone grease is filled between the front end of the first balance piston body and the external pressure channel. Hydraulic oil is filled between the rear end of the first balance piston and the first pressure sensor.

3. The drilling pressure monitoring probe as described in claim 1, characterized in that, The second balance piston assembly is a second balance piston body with a second sealing ring. The second balance piston body is installed at the end of the inner pressure channel. The second balance piston body has a groove structure in the middle. The second sealing ring is set in the middle groove. Silicon grease is filled between the front end of the second balance piston body and the inner pressure channel. Hydraulic oil is filled between the rear end of the second balance piston body and the second pressure sensor.

4. The drilling pressure monitoring probe as described in claim 1, characterized in that, The sealing structure is a sealing ring installed inside the sealing groove of the PCB housing.

5. The drilling pressure monitoring probe as described in claim 1, characterized in that, The upper connector, PCB housing, extension tube, and lower connector are sequentially threaded together.

6. The drilling pressure monitoring probe as described in claim 1, characterized in that, The extension tube has a variable diameter structure in the middle.

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