Seven-core sealing plug manufactured by secondary pouring process

Abstract

The utility model relates to a seven-core sealing plug manufactured by a secondary pouring process, which comprises a shell, conductive needles, a first filling body and a second filling body, the first filling body and the second filling body are adjacently fused and fixed in the shell, a plurality of conductive needles are uniformly arranged in the shell and are fixed in the first filling body and the second filling body, and the conductive needles are arranged in the shell and are fixed in the first filling body and the second filling body. A plurality of annular grooves are formed in the middle of each conductive needle, and the annular grooves in the conductive needles are different in position and staggered from one another. The high-temperature-resistant and high-pressure-resistant cable has excellent high-temperature-resistant and high-pressure-resistant performance, has a good insulation voltage-resistant value and a good insulation resistance value under the condition, and is simple in structure and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of oil and gas exploration and development, especially relates to a seven-core sealing plug manufactured by secondary pouring process, which can be used for sealing accessories of high-temperature and high-pressure logging instruments and perforating tools in oil and gas wells. BACKGROUND

[0002] In the exploration and development of oil and gas, with the development of drilling technology, more and more deep reservoirs and shale gas or oil reservoirs with complex geological conditions are proved and exploited, which have the characteristics of high temperature and high pressure or ultrahigh temperature and ultrahigh pressure.

[0003] In such high-temperature and high-pressure environment, logging and perforating operations require logging instruments or perforating tools to have the hard indicators of ultrahigh temperature and ultrahigh pressure, and the sealing pressure-bearing parts require high insulation resistance under the rated working voltage and working current. The traditional sealing plug is usually made of a single material in one time, which has the problems of insufficient high-temperature resistance and high-pressure resistance, and is prone to deformation or failure. Therefore, there is an urgent need for a sealing plug that can maintain good sealing performance and electrical performance under extreme conditions. SUMMARY

[0004] The utility model discloses a seven-core sealing plug manufactured by secondary pouring process, which has excellent high-temperature resistance and high-pressure resistance, and has good insulation withstand voltage and insulation resistance under such conditions, and has the advantages of simple structure and long service life.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A seven-core sealing plug manufactured by secondary pouring process, comprising a shell, a conductive needle, a first filler and a second filler, the first filler and the second filler are adjacent to each other and are solidified in the shell, a plurality of conductive needles are uniformly arranged in the shell and are fixed in the first filler and the second filler, a plurality of annular grooves are arranged in the middle of each conductive needle, and the annular grooves on the plurality of conductive needles are different in position and are staggered with each other.

[0007] The outer part of the shell is provided with threads and a circular arc at both ends, a plurality of annular sealing grooves and a hexagonal protrusion are arranged between the threads and the circular arc, a step is arranged in the inner hole of the shell at the thread end, the inner hole of the shell at the circular arc end is a tapered hole, and a step is also arranged between the tapered hole and the straight inner hole in the middle.

[0008] The first filler is thermoplastic polyimide, and the second filler is cross-linked polyether ether ketone (i.e., cross-linked PEEK).

[0009] Preferably, the conductive needle is seven.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] 1. The utility model discloses a secondary pouring process, solve the problem of the electrically conductive needle displacement when pouring, deviate from the set position, effectively control the electrically conductive needle position degree tolerance range, ensure the alignment rate of pin jack cooperation and guarantee the plugging force eligible.

[0012] 2. In the utility model, follow the technical development direction, adopt the different melting point material and fill twice, the inside step and the taper surface design of shell, the whole sealing plug can bear temperature 240-260 DEG, and the high pressure can reach 175MPa.

[0013] 3. In the utility model, since adopting secondary pouring process, solve the problem of the electrically conductive needle displacement when pouring, deviate from the set position, the gap between the electrically conductive needle, the electrically conductive needle and the shell is evenly distributed, so the whole electrical performance of sealing plug has improved greatly, namely the insulation resistance value and insulation withstand voltage value are very high. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure schematic diagram of seven core sealing plug of the utility model.

[0015] Figure 2 It is the side view of Figure 1 .

[0016] Figure 3 It is the shell schematic diagram.

[0017] Figure 4 It is the A-A view of Figure 3 .

[0018] Figure 5 It is the electrically conductive needle structure schematic diagram of upper and lower positioning ring.

[0019] Figure 6 It is the pouring process schematic diagram (first pouring).

[0020] Figure 7 It is the pouring process schematic diagram (second pouring).

[0021] In the drawing: 1, shell, 1-1 screw thread, 1-2 annular sealing groove, 1-3 hexagonal convex, 1-4 circular arc, 1-5 end step, 1-6 middle step, 1-7 conical hole, 2, electrically conductive needle, 2-1 annular groove, 3, first filling body, 4, second filling body. DETAILED DESCRIPTION

[0022] In order to make the purpose, advantage and feature of the utility model more clear, the following combining with the utility model discloses a secondary pouring process manufacturing seven core sealing plug further detailedly.

[0023] As Figures 1-7As shown, a seven-core sealing plug manufactured by a secondary pouring process comprises a shell 1, a conductive needle 2, a first filling body 3, and a second filling body 4, the first filling body 3 and the second filling body 4 are sequentially poured and fused in the shell 1, a plurality of conductive needles 2 are uniformly arranged in the shell 1 and fixed in the first filling body 3 and the second filling body 4, and a plurality of annular grooves 2-1 are arranged in the middle of each conductive needle 2.

[0024] The conductive needle 2 is seven, the seven conductive needles 2 are arranged in the shell 1, and the sealing plug is integrally formed by secondary pouring, the first filling body 3 is poured first, and the second filling body 4 is poured second.

[0025] The outer part of the shell 1 is respectively provided with a thread 1-1 and a circular arc 1-4, a plurality of annular sealing grooves 1-2 and a hexagonal protrusion 1-3 are arranged between the thread 1-1 and the circular arc 1-4, the inner hole of the shell 1 at one end of the thread 1-1 is provided with a step (end step 1-5), the inner hole at one end of the circular arc 1-4 is a tapered hole 1-7, and a step (middle step 1-6) is also arranged between the tapered hole 1-7 and the straight inner hole in the middle.

[0026] The first filling body 3 is thermoplastic polyimide, and the second filling body 4 is cross-linked polyether ether ketone (i.e., cross-linked PEEK).

[0027] The working temperature of the seven-core sealing plug of the utility model is within 300 DEG C, and the rated working pressure is within 175 MPa. The working voltage of the seven-core sealing plug is greater than 1000 VDC, and the insulation resistance value is not less than 3000 MΩ.

[0028] As shown in Figure 3 , Figure 4 , the outer part of the shell 1 is designed with annular sealing grooves 1-2 for installing sealing rings, further enhancing the sealing effect, and is also designed with a hexagonal protrusion 1-3 and a thread 1-1 for assembling and fastening. The end is designed with a circular arc 1-4 structure, which is convenient for installation and disassembly, and at the same time reduces stress concentration.

[0029] As shown in Figure 5 , the middle of the conductive needle 2 is provided with an annular groove 2-1, and the annular grooves 2-1 of the seven conductive needles 2 are different in position and staggered with each other.

[0030] As shown in Figure 6 , Figure 7As shown, seven conductive needles 2 are evenly arranged in the shell 1, the first filling body 3 (i.e. thermoplastic polyimide) is cast for the first time, the casting temperature is between 380-400℃, the shell 1 and the seven conductive needles 2 are solidified together, so that the seven conductive needles 2 will not run out of position, if cast all at once, the conductive needle 2 will be extruded and deformed or out of position, thereby affecting the insulation resistance value and the insulation withstand voltage value, so that the yield of the sealing plug is greatly reduced. The second filling body 4 (i.e. cross-linked PEEK) is cast for the second time, the casting temperature is 360°, and after solidification, the molding is completed.

[0031] In this way, the long-term working temperature of the seven-core sealing plug of the utility model can reach 240-260°, the short-term working temperature is 300℃, (the working temperature of high-quality thermoplastic polyimide is 250°-310°, and the working temperature of cross-linked PEEK is 260°), combined with the internal structure of the shell 1, the overall rated working pressure of the sealing plug can reach 175MPa. Under the condition of high temperature and high pressure, the working voltage is greater than 1000VDC, and the insulation resistance value is not less than 3000MΩ.

[0032] At the same time, since the two-step casting is adopted, the position tolerance range of the seven conductive needles 2 is small, the alignment rate of the 7-pin jack is improved, which is beneficial to improve the electrical performance during work and ensure that the plugging force is qualified.

[0033] The above is only an embodiment of the utility model, and is not a limitation on the protection scope of the utility model, any equivalent structural transformation or direct or indirect application in other related technical fields based on the content of the utility model specification and drawings is included in the patent protection scope of the utility model.

Claims

1. A seven core closure manufactured by a secondary pouring process, characterized in that, The application relates to a conductive needle, which comprises a shell, conductive needles, a first filling body and a second filling body, the first filling body and the second filling body are adjacent to each other and are fixed in the shell, the conductive needles are uniformly arranged in the shell and are fixed in the first filling body and the second filling body, a plurality of annular grooves are arranged in the middle of each conductive needle, the annular grooves on the conductive needles are different in position and are staggered with each other.

2. A seven-cored closure plug manufactured by a secondary molding process according to claim 1, characterized in that, The outer ends of the shell are respectively provided with threads and circular arcs, a plurality of annular sealing grooves and a hexagonal convex are arranged between the threads and the circular arcs, a step is arranged in the inner hole of the thread end of the shell, the inner hole of the circular arc end is a conical hole, and a step is also arranged between the conical hole and the straight inner hole in the middle.

3. A seven-cored closure plug manufactured by a secondary molding process according to claim 1, wherein The first filling body is thermoplastic polyimide, and the second filling body is cross-linked polyether ether ketone.

4. A seven-cored closure plug manufactured by a secondary molding process according to claim 1, wherein The conductive needles are seven in number.

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