CN205618151U - Downhole pressure detection device - Google Patents

Abstract

The utility model relates to the technical field of pressure detection, in particular to a downhole pressure detection device for permanent coalbed gas detection in a deep well environment. The fluid channel of the downhole pressure detection device of the utility model is arranged longitudinally, which is beneficial to the miniaturization of the whole device. The chamber communicates with the fluid channel through the first through hole, and the second chamber communicates with the first chamber through the second through hole. One end of the cable passes through the second through hole and is electrically connected to the pressure sensor body, and the other end is connected to the pressure sensor body through the second through hole. The chamber protrudes from the outside of the shaft-shaped main body, which is beneficial to the better airtightness of the whole device and solves the problem of cable arrangement required for long-distance signal transmission.

Description

Downhole pressure detection device

technical field

The utility model relates to the technical field of pressure detection, in particular to a downhole pressure detection device used for permanent coalbed gas detection in a deep well environment.

Background technique

The exploration and development process of coalbed methane mainly includes the stages of drilling, well completion and drainage, and drainage is an important link in the development of coalbed methane. Relevant theoretical research and practical experience at home and abroad show that the downhole pressure data in the process of coalbed methane removal is very important, and it is an important parameter for judging drainage accidents and formulating a reasonable drainage process. Based on this, relevant scholars and companies at home and abroad have developed some relevant downhole pressure gauges to detect downhole pressure data in real time. The detection effect of the downhole pressure detection method for coalbed methane extraction wells is not ideal, especially in terms of sealing performance and long-distance transmission of signals.

In view of this, to overcome the above defects in the prior art and to provide a downhole pressure detection device for permanent coalbed methane detection in deep well environment has become a technical problem to be solved urgently in this field.

Contents of the invention

The purpose of this utility model is to provide a downhole pressure detection device for the above-mentioned defects of the prior art.

The purpose of this utility model can be realized by following technical measures:

A downhole pressure detection device. Compared with the prior art, the difference lies in that the device includes an upper connecting body, a shaft-shaped main body and a lower connecting body connected in sequence; wherein, the pressure detecting device has An extended fluid channel, the fluid channel passes through the upper connecting body, the shaft-shaped body and the lower connecting body in turn; the shaft-shaped body is provided with a first chamber and a second chamber extending from the fluid channel to the The first through hole of the first chamber, and the second through hole extending from the first chamber to the second chamber; a pressure sensor is arranged in the first chamber, and the measuring end of the pressure sensor is at the The end of the first chamber on the side of the first through hole exposes the measuring end to the fluid, and a first seal is provided between the body of the pressure sensor and the inner wall of the first chamber; the second chamber A cable is arranged in the chamber, and a sealing body is provided between the cable and the inner wall of the second chamber. One end of the cable is electrically connected to the pressure sensor body through the second through hole, and the other end is connected to the pressure sensor body from the second chamber. protrudes outside the shaft-like body.

Preferably, the sealing body includes a sealing body body, a gland disposed on the upper end of the sealing body body, and a sealing ring disposed in the sealing body body, the sealing body body and the gland are both provided with wire holes, and the sealing body The inner wall of the wire hole of the main body is provided with an annular groove for accommodating the sealing ring. The gland is inserted into the sealing body body from the top of the sealing body until it contacts the sealing ring. The holes are connected to form a wire passage.

Preferably, the sealing body is further provided with at least one compression bolt extending longitudinally.

Preferably, the first chamber extends from one end on the side of the first through hole to the outer surface of the shaft body in the radial direction of the shaft body. One end to the end away from the first through hole is divided into the first section, the second section and the third section in turn, the measuring end of the pressure sensor is accommodated in the first section, the body of the pressure sensor is accommodated in the second section, and the third section With sealing plug.

Preferably, a second sealing member is provided between the sealing plug and the junction of the second section and the third section.

Preferably, the detection device further includes at least one fastener sheathed on the upper connection part for fixing the outer part of the cable protruding from the second chamber.

Preferably, the outer surface of the upper connector is provided with a groove for accommodating the fastener.

Preferably, the upper end of the shaft-shaped main body is connected to the upper connecting body through thread fitting, and the lower end of the shaft-shaped main body is connected to the lower connecting body through thread fitting.

Preferably, the upper end of the shaft-shaped body forms a recess, and the lower end of the upper connecting body forms a protrusion that fits into the recess of the shaft-shaped body.

Preferably, the lower end of the shaft-shaped main body forms a protrusion, and the upper end of the lower connecting body forms a recess that cooperates with the protrusion of the shaft-shaped main body.

The fluid channel of the downhole pressure detection device of the utility model is arranged longitudinally, which is beneficial to the miniaturization of the whole device. The chamber communicates with the fluid channel through the first through hole, and the second chamber communicates with the first chamber through the second through hole. One end of the cable passes through the second through hole and is electrically connected to the pressure sensor body, and the other end is connected to the pressure sensor body through the second through hole. The chamber protrudes from the outside of the shaft-shaped main body, which is beneficial to the better airtightness of the whole device and solves the problem of cable arrangement required for long-distance signal transmission.

Description of drawings

Fig. 1 is a front view of the pressure detection device of the present invention.

Fig. 2 is a partially enlarged view of the pressure detection device of the present invention.

Fig. 3 is a side view of the pressure detection device of the present invention.

Fig. 4 is a front view of the sealing body in the pressure detection device of the present invention.

Fig. 5 is a top view of the sealing body in the pressure detection device of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In the following text, many aspects of the invention will be better understood with reference to the accompanying drawings. Components in the figures are not necessarily drawn to scale. Instead, the emphasis is on clearly illustrating the components of the invention. Furthermore, like reference numerals indicate corresponding parts throughout the several views of the drawings.

As used herein, the word "exemplary" or "illustrative" means serving as an example, instance, or illustration. Any implementation described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other implementations. All of the embodiments described below are exemplary embodiments provided to enable those skilled in the art to make and use examples of the disclosure and are not intended to limit the scope of the disclosure, which is defined by Claims limited. In other embodiments, well-known features and methods are described in detail so as not to obscure the present invention. For the purposes of this description, the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal" and their derivatives will be oriented as shown in Figure 1 related to the utility model. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes shown in the drawings and described in the following description are simple exemplary embodiments of the inventive concepts defined in the appended claims. Therefore, specific dimensions and other physical characteristics related to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.

Fig. 1 shows a downhole pressure detection device 100, the device 100 includes: an upper connecting body 20, a shaft-shaped main body 10 and a lower connecting body 30, the device 100 has a fluid channel 101 extending along its central axis, when the device 100 When placed in the lower part of a deep well, the gas flows through the fluid channel 101 , and the fluid channel 101 passes through the upper connecting body 20 , the shaft-shaped main body 10 and the lower connecting body 30 in sequence.

The shaft-shaped main body 10 has an upper end 11 and a lower end 12, and threads are engraved on the upper end 11 and the lower end 12, and the upper connecting body 20 and the lower connecting body 30 are connected to the shaft-shaped main body 10 through threads. In a preferred embodiment, the upper end 11 of the shaft-shaped main body 10 forms a recess, the lower end of the upper connecting body 20 forms a protrusion that matches the recess of the upper end 11, and the thread of the upper end 11 is engraved on the surface of the recess. The lower end 12 of the shaft-shaped main body 10 forms a raised portion, and the upper end of the lower connecting body 30 forms a concave portion matched with the raised portion of the lower end 12, and the thread of the lower end 12 is engraved on the surface of the raised portion.

Please refer to Fig. 1, Fig. 2 and shown in Fig. 3, be provided with the first chamber 13, the second chamber 14, the first through hole 15 and the second through hole 16 in the shaft-shaped main body 10, the first through hole 15 from The fluid channel 101 extends to the first chamber 13 , and the second through hole 16 extends from the first chamber 13 to the second chamber 14 . A pressure sensor 40 is arranged in the first chamber 13, and the measuring end 40a of the pressure sensor 40 is located at the end of the first through hole 15 side in the first chamber 13 so that the measuring end 40a is exposed to the fluid. A first seal 51 is provided between the body 40b and the inner wall of the first chamber 13 . A cable 60 is arranged in the second chamber 14, a sealing body 70 is arranged between the cable 60 and the inner wall of the second chamber 14, and one end of the cable 60 passes through the second through hole 16 and is electrically connected to the body 40b of the pressure sensor 40. The connection and the other end protrude from the second chamber 14 to the outside of the shaft-shaped main body 10 . The data measured by the downhole joint (including the measuring device 100) is transmitted to the upper computer on the surface in real time through the cable 60, and the longest transmission distance is 3000 meters. The upper computer is equipped with software that can short-circuit the data sent from the downhole Perform real-time display in the form of waveform diagrams. In a preferred embodiment, the first chamber 13 extends from one end on the side of the first through hole 15 along the radial direction of the shaft-shaped body 10 to the outer surface of the shaft-shaped body 10, and the first chamber 13 is in a stepped shape. The end close to the first through hole 15 and the end away from the first through hole 15 are sequentially divided into a first section 13a, a second section 13b and a third section 13c, and the measuring end 40a of the pressure sensor 40 is accommodated in the first section 13a, For example, the measuring end 40a forms a thread fit with the inner wall of the first section 13a, the body 40b of the pressure sensor 40 is accommodated in the second section 13b, and a sealing plug 80 is arranged in the third section 13c, and the sealing plug 80 is connected to the second section 13b and the second section 13b. A second seal 52 is provided between the joints of the three sections 13c. The sealing plug 80, the first sealing member 51 and the second sealing member 52 ensure that the first chamber 13 forms a sealed space, and only the measuring end 40a of the pressure sensor 40 is exposed to the fluid. The end face of the sealing plug 80 can be processed with a square groove, so that it can be easily unscrewed by using an Allen wrench.

4 and 5, the sealing body 70 includes a sealing body body 71, a gland 72, and a sealing ring 73. The main body 71 and the gland 72 are respectively provided with a wire passing hole 71a and a wire passing hole 71b, and the inner wall of the wire passing hole 71a of the sealing body 71 is provided with an annular groove for accommodating the sealing ring 73, and the sealing ring 73 is clamped in the annular groove , the gland 72 is inserted into the seal body 71 from the top of the seal body 71 until it contacts the seal ring 73, the wire hole 71a of the seal body 71 communicates with the wire hole 72a of the gland 72 to form a wire passage, and the cable 60 cards are set in the cable passage. The sealing body 70 is also provided with compression bolts 74 extending longitudinally therein, for example, the number of compression bolts 74 is 4, and the number of compression bolts 74 is evenly distributed along the circumference. When pressing the gland 72 and the sealing body body 71 with four pressing bolts 74 , the sealing ring 73 will be squeezed and deformed, so as to realize the sealing of the cable 60 . There are square grooves on the tops of the four hold-down bolts 74, which are convenient to be unscrewed with an Allen wrench. See also shown in Fig. 4, there are altogether 8 holes on the sealing body 70, four of which are threaded holes used by four compression bolts 74, and the other four are through holes for fixing the sealing body 70 with fixing bolts on the shaft-shaped main body 10 . Two or more sealing bodies 70 can also be arranged along the vertical direction.

In a preferred embodiment, the upper connecting portion 20 is covered with a fastener 90 , and the fastener 90 is used to fix the outer part of the cable 60 protruding from the second chamber 14 . One or more fasteners 90 may be provided, for example, two. In order to avoid hitting the inner wall of the borehole due to the excessive size of the fastener 90 , the outer surface of the upper connecting body 20 is provided with a groove for accommodating the fastener 90 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A downhole pressure detection device, characterized in that the device comprises an upper connection body, a shaft-shaped main body and a lower connection body connected in sequence; wherein the pressure detection device has a fluid channel extending along its central axis, the The fluid channel passes through the upper connecting body, the shaft-shaped body and the lower connecting body in sequence; the shaft-shaped body is provided with a first chamber, a second chamber, and a first chamber extending from the fluid passage to the first chamber. A through hole, and a second through hole extending from the first chamber to the second chamber; a pressure sensor is arranged in the first chamber, and the measuring end of the pressure sensor is located in the first chamber The end on the side of the first through hole is used to expose the measuring end to the fluid, and a first sealing member is provided between the body of the pressure sensor and the inner wall of the first chamber; cables are arranged in the second chamber, A sealing body is provided between the cable and the inner wall of the second chamber, one end of the cable is electrically connected to the pressure sensor body through the second through hole, and the other end extends out of the shaft-shaped main body from the second chamber. 2. The downhole pressure detection device according to claim 1, wherein the sealing body comprises a sealing body body, a gland arranged at the upper end of the sealing body body, and a sealing ring arranged in the sealing body body, and the sealing body Both the body and the gland are provided with wire holes, and the inner wall of the wire hole of the sealing body body is provided with an annular groove for accommodating the sealing ring. The gland is inserted into the sealing body from the top of the sealing body until it meets the sealing ring. Contact, the wire hole of the sealing body body communicates with the wire hole of the gland to form a wire channel. 3. The downhole pressure detection device according to claim 2, wherein the sealing body is further provided with at least one compression bolt extending longitudinally. 4. The downhole pressure detection device according to claim 1, wherein the first chamber extends from one end on the side of the first through hole to the outer surface of the shaft-shaped body in the radial direction of the shaft-shaped body, and the first chamber A chamber is stepped, and it is divided into the first section, the second section and the third section in turn from the end close to the first through hole to the end far away from the first through hole, and the measuring end of the pressure sensor is accommodated in the first section , the body of the pressure sensor is accommodated in the second section, and a sealing plug is provided in the third section. 5. The downhole pressure detection device according to claim 4, characterized in that, a second sealing member is provided between the sealing plug and the junction of the second section and the third section. 6. The downhole pressure detection device according to claim 1, characterized in that, the detection device further comprises at least one fastener sleeved on the upper connection part for fixing the cable extending from the second chamber. out of the external part. 7. The downhole pressure detection device according to claim 6, wherein a groove for accommodating the fastener is formed on the outer surface of the upper connector. 8. The downhole pressure detection device according to claim 1, characterized in that, the upper end of the shaft-shaped main body is connected to the upper connecting body through screw fit, and the lower end of the shaft-shaped main body is connected to the lower connecting body through Thread fit connection. 9 . The downhole pressure detection device according to claim 8 , wherein the upper end of the shaft-shaped main body forms a concave portion, and the lower end of the upper connecting body forms a raised portion matching the concave portion of the shaft-shaped main body. 10 . 10 . The downhole pressure detection device according to claim 8 , wherein a protrusion is formed at the lower end of the shaft-shaped body, and a depression is formed at the upper end of the lower connecting body to cooperate with the protrusion of the shaft-shaped body. 11 .