High-temperature and high-pressure magnetic positioning instrument with safety protection

Abstract

The utility model belongs to the technical field of oil-gas exploration and development perforation operation, and particularly relates to a high-temperature and high-pressure magnetic positioning instrument with safety protection, which is characterized in that a safety isolation core is arranged between a front electrode and a rear electrode in a lower joint component and comprises a pressure sensing cap, a pin body, a spring, an insulating ring and a conducting ring, the head end of the pin body is connected with a pressure sensing cap, a spring is arranged between the tail of the pin body and the mounting hole, an insulating ring and a conducting ring are arranged on the pin body side by side, the insulating ring is in contact with the electrode before the pressure spring is compressed, and the conducting ring is in contact with the electrode after the pressure spring is compressed. Compared with the prior art, the utility model has the beneficial effects that the safety protection function is realized, the core body assembly and the perforating gun string are physically isolated and the circuit is not conducted when the magnetic positioning instrument is in the range of more than 50 meters from the ground to the underground, and the problems that the magnetic positioning instrument does not reach the working surface and the accident potential is caused by misoperation are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas exploration and development perforating operation technical field especially relates to a high temperature and high pressure magnetic locator with safety protection. BACKGROUND

[0002] In the oil and gas exploration and development, more and more deep reservoirs and complex geological conditions of shale gas or reservoirs are proved and exploited, and the construction well has the characteristics of high temperature and high pressure. In this kind of high temperature and high pressure environment, the perforating operation requires that the logging instrument or the perforating tool string is resistant to high temperature and high pressure, and the normal requirement is resistant to 250 DEG C temperature and 200MPa pressure. The magnetic locator is indispensable depth positioning instrument in the perforating operation, and its structure includes an upper joint assembly, an outer cylinder, a core assembly, a shock absorbing block and a lower joint assembly. The lower joint assembly is used for being connected with the perforating gun string and transmitting the ground ignition initiation electric signal to the perforating gun string.

[0003] In actual application, when the magnetic locator is connected with the perforating gun string, if the current collecting ring in the lower joint assembly is forgotten to be pulled out, the perforating gun string may cause an accident due to the misconnection of the electric current signal before reaching the working depth, and safety hazards are brought. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a high temperature and high pressure magnetic locator with safety protection, overcoming the defects of the prior art, having the safety protection function, making the magnetic locator not transmit the electric signal to the connected perforating tool string in the range from the ground to the depth of 50 meters underground due to the misoperation, and only when the magnetic locator reaches the depth of 50 meters underground, the internal safety isolation core is in the conduction state to supply power to the perforating tool string, so that the problem of the accident hidden danger caused by the misoperation of the magnetic locator before reaching the working surface is solved.

[0005] To achieve the above object, the utility model realizes the following technical scheme:

[0006] A high temperature and high pressure magnetic locator with safety protection, comprising an upper joint assembly, an outer cylinder, a core assembly, a shock absorbing block and a lower joint assembly, the lower joint assembly is used for being connected with the perforating gun string, characterized in that a safety isolation core is arranged between the front and rear electrodes in the lower joint assembly, the safety isolation core comprises a pressure sensing cap, a pin body, a spring, an insulating ring and a conductive ring, the head end of the pin body is connected with the pressure sensing cap, the spring is arranged between the tail of the pin body and the mounting hole, the insulating ring and the conductive ring are arranged side by side on the pin body, the insulating ring is in contact with the electrode before the compression of the compression spring, and the conductive ring is in contact with the electrode after the compression of the compression spring.

[0007] Further, the section where the sealing ring is arranged is provided with a plurality of sealing grooves, and the sealing grooves are provided with sealing rings.

[0008] Further, the sealing ring is an O-shaped silica gel sealing ring.

[0009] Further, the shell of the lower joint assembly is made of PCrNi3MoV alloy steel.

[0010] Further, the length ratio of the insulating ring and the conductive ring is 1:1.

[0011] Further, the electrode comprises an electrode one and an electrode two, the electrode one is connected with an elastic seat one in the lower joint assembly, and the elastic seat one is internally provided with a spring one.

[0012] Further, the electrode two is connected at the front end of the perforating gun string, and the electrode two is connected with an elastic seat two in the lower joint assembly, and the elastic seat two is internally provided with a spring two.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1) have the safety protection function, make the magnetic positioner in the range of ground to underground 50m depth above, the core body assembly and the perforating gun string adopt the physical isolation, the circuit does not conduct, thereby will not cause the electric signal transmission to the connected perforating tool string because of the misoperation, solves the problem that the magnetic positioner does not reach the working face, causes the accident hidden danger because of the misoperation.

[0015] 2) when the magnetic positioner only enters the well to underground 50m, the safety isolation core automatically triggers to open, and the internal safety isolation core is in the conduction state only, can supply power to the perforating tool string, and the perforating tool string can work normally, thereby improves the safety protection performance, ensures the construction safety, and the structure is simple, easy to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the internal structure schematic diagram of the magnetic positioner of the utility model embodiment;

[0017] Figure 2 is the structure schematic diagram of the lower joint assembly in the utility model embodiment;

[0018] Figure 3 is the schematic comparison diagram that the safety isolation core moves under the external pressure in the utility model embodiment;

[0019] Figure 4 is the electrode installation structure schematic diagram in the lower joint assembly in the utility model embodiment.

[0020] In the figure: 1 - upper joint assembly, 2 - outer cylinder, 3 - core assembly, 4 - shock absorbing block, 5 - safety lower joint, 6 - safety isolation core, 7 - perforating gun string, 8 - pressure sensing cap, 9 - pin body, 10 - compression spring, 11 - insulating ring, 12 - conductive ring, 13 - electrode one, 14 - electrode two, 15 - sealing ring, 16 - elastic sleeve one, 17 - spring one, 18 - elastic sleeve two, 19 - spring two. DETAILED DESCRIPTION

[0021] The technical solutions of the utility model will be described clearly and completely in combination with specific embodiments below. Obviously, the described embodiments are some of the embodiments of the utility model, rather than all the embodiments.

[0022] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art, the specific embodiments needed in the description of the specific embodiments or prior art will be briefly introduced below. Obviously, the specific embodiments described below are some of the embodiments of the utility model, and other specific embodiments can also be obtained by those skilled in the art without creative labor on the basis of these specific embodiments.

[0023] The components of the embodiments of the utility model described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the specific embodiments is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model.

[0024] See Figures 1-4 It is a structure schematic diagram of a high-temperature and high-pressure magnetic positioning instrument with safety protection, comprising an upper joint assembly 1, an outer cylinder 2, a core assembly 3, a shock absorbing block 4 and a lower joint assembly 5. The lower joint assembly 5 is used to be connected with the perforating gun string 7. A safety isolation core 6 is arranged between the front and rear electrodes in the lower joint assembly 5. The safety isolation core 6 comprises a pressure sensing cap 8, a pin body 9, a compression spring 10, an insulating ring 11 and a conductive ring 12. The head end of the pin body 9 is connected with the pressure sensing cap 8. The spring 10 is arranged between the tail of the pin body 9 and the mounting hole. The insulating ring 11 and the conductive ring 12 are arranged side by side on the pin body 9. Before the compression spring 10 is compressed, the insulating ring 11 is in contact with the electrodes on both sides. After the compression spring 10 is compressed, the conductive ring 12 is in contact with the electrodes on both sides. A sealing ring 15 is further arranged between the pin body 9 and the outside of the mounting hole. The section where the sealing ring 15 is arranged is provided with multiple sealing grooves, and the sealing grooves are provided with sealing rings. In the embodiment, there are two sealing grooves. The sealing ring 15 is an O-shaped silica gel sealing ring, which can withstand a high temperature of 350 DEG C.

[0025] The shell of the lower joint assembly 5 is made of PCrNi3MoV alloy steel and can withstand a pressure of 200 MPa.

[0026] The length ratio of the insulating ring 11 and the conductive ring 12 is 1:1, which can ensure reliable switching.

[0027] The electrodes include an electrode one 13 and an electrode two 14, the electrode one 13 is connected with an elastic seat one 16 in the lower joint assembly 5, and the elastic seat one 16 is provided with a spring one 17. The electrode two 14 is connected with the front end of the perforating gun string 7, and the electrode two 14 is connected with an elastic seat two 18 in the lower joint assembly 5, and the elastic seat two 18 is provided with a spring two 19. The electrode one 13 and the electrode two 14 can realize the communication of the circuit.

[0028] When the depth of the ground or the oil and gas well liquid surface is more than 50 m, the safety isolation core is in a disconnected state, i.e. cannot transmit the electric signal. When reaching below the liquid surface 50 m, the pressure sensing cap 8 is pushed by the liquid column pressure, the internal pin 9 moves, the conductive ring 12 moves forward and forms a conduction state with the left and right electrodes, and the electric signal can be transmitted.

[0029] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high-temperature, high-pressure magnetic positioning device with safety protection, comprising an upper connector assembly, an outer cylinder, a core assembly, a shock-absorbing block, and a lower connector assembly, wherein the lower connector assembly is used to connect to a perforating gun string, characterized in that, A safety isolation core is provided between the front and rear electrodes in the lower connector assembly. The safety isolation core includes a pressure sensing cap, a pin, a spring, an insulating ring, and a conductive ring. The head end of the pin is connected to the pressure sensing cap, and a spring is provided between the tail end of the pin and the mounting hole. An insulating ring and a conductive ring are arranged side by side on the pin. Before the spring is compressed, the insulating ring is in contact with the electrode. After the spring is compressed, the conductive ring is in contact with the electrode. A sealing ring is also provided between the pin and the outer side of the mounting hole.

2. The high-temperature and high-pressure magnetic positioning instrument with safety protection according to claim 1, characterized in that, The section containing the sealing ring has multiple sealing grooves, and the sealing ring is installed in the sealing groove.

3. A high-temperature, high-pressure magnetic positioning device with safety protection according to claim 2, characterized in that, The sealing ring is an O-ring silicone sealing ring.

4. A high-temperature, high-pressure magnetic positioning device with safety protection according to claim 1, characterized in that, The housing of the lower connector assembly is made of PCrNi3MoV alloy steel.

5. A high-temperature, high-pressure magnetic positioning instrument with safety protection according to claim 1, characterized in that, The length ratio of the insulating ring to the conductive ring is 1:

1.

6. A high-temperature, high-pressure magnetic positioning device with safety protection according to claim 1, characterized in that, The electrode includes electrode one and electrode two. Electrode one is connected to elastic sleeve one in the lower connector assembly. Elastic sleeve one is provided with spring one.

7. A high-temperature, high-pressure magnetic positioning device with safety protection according to claim 6, characterized in that, The second electrode is connected to the front end of the perforation gun string, and the second electrode is connected to the second elastic seat in the lower connector assembly. The second elastic seat is provided with a second spring.

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