Totally enclosed cable connector

Abstract

The utility model relates to oil well logging technical field, especially relate to a full -enclosed cable connector. The device includes main part shell, cable armoring locking mechanism, cable multistage sealing structure, cable core signal line multistage sealing structure, the main part shell includes primary fishing head mechanism, secondary fishing head, lower joint, cable armoring locking mechanism is connected and is fixed in primary fishing head mechanism inner wall, the cable lower part that crosses into cable armoring locking mechanism is stripped off the armoring layer and forms cable core signal line, the armoring layer of cable end is locked up and is locked up and is limited in cable armoring locking mechanism in the limiting knot body that forms by locking coil winding. The utility model discloses multistage sealing structure, and the sealing effect is good, through locking coil winding, increase friction resistance, realize the size control of pulling force through the number of turns, do not have any damage to cable inner and outer armoring, when the well logging instrument is stuck in the well, when pulling cable reaches threshold, cut off screw, so as not to pull off cable, reduce the loss.

Description

Technical fields:

[0001] This utility model relates to the field of oil well logging technology, and in particular to a fully enclosed cable connector. Background technology:

[0002] When oilfield production plants test wells producing oil, gas, and water, cables are quickly connected to the testing instruments via logging cable heads to transmit downhole signals to surface equipment, while also serving to lower and raise the instruments.

[0003] The sealing effect of the existing logging cable head is not ideal, which can easily cause liquid ingress short circuit between the cable core signal line and the logging instrument interface, leading to test failure.

[0004] Because different operators use different connection and assembly methods when connecting cables and logging instruments through the logging cable head, and because different logging instruments have different weights, the upper limit of the tensile force that the cable can withstand after being connected to the logging instrument varies. When the logging instrument gets stuck or obstructed, it is necessary to pull the logging cable head to pull out the stuck logging instrument. Since it is impossible to determine the upper limit of the tensile force that the cable can withstand after being connected to the logging instrument, when pulling the logging cable head, too much force is often applied, exceeding the upper limit of the tensile force that the cable can withstand after being connected to the logging instrument, causing the logging instrument to fall into the well or the cable to break. Utility Model Content:

[0005] The technical problem to be solved by this utility model is to provide a fully enclosed cable connector. The device adopts a multi-stage sealing structure, which has a good sealing effect, meets the insulation requirements, and ensures smooth signal transmission. By locking the coil winding, the frictional resistance is increased, and the tensile force is controlled by the number of turns, without any damage to the inner and outer armor of the cable. The upper and lower parts are connected by shear screws. When the logging instrument gets stuck in the well, the screws are sheared when the cable is pulled up to the threshold, so as not to break the cable and reduce losses.

[0006] The technical solution adopted by this utility model is: a fully enclosed cable connector, including a main body shell, a cable armor locking mechanism, a multi-level sealing structure for the cable, and a multi-level sealing structure for the cable core signal line;

[0007] The main body shell includes a primary retrieval head mechanism, a secondary retrieval head, and a lower connector. The lower end of the primary retrieval head mechanism is connected to the secondary retrieval head via a shear pin. The lower connector is sealed to the inner wall of the lower end of the secondary retrieval head. The male connector is connected to the inner wall of the lower end of the lower connector.

[0008] The cable armor locking mechanism is connected and fixed to the inner wall of the primary retrieval head mechanism. The lower part of the cable that passes through the cable armor locking mechanism has its armor layer stripped to form a cable core signal line. The armor layer at the end of the cable is locked by a locking coil to form a limiting structure that is limited within the cable armor locking mechanism.

[0009] The multi-stage sealing structure of the cable includes a primary sealing structure and a secondary sealing structure. The primary sealing structure seals the gap between the cable and the primary retrieval head mechanism, and the secondary sealing structure seals the gap between the upper end of the cable armor locking mechanism and the cable.

[0010] The multi-stage sealing structure of the cable core signal line includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure. The primary sealing structure seals the gap between the lower end of the cable armor locking mechanism and the cable core signal line. The secondary sealing structure seals the gap between the secondary retrieval head and the cable core signal line. The tertiary sealing structure seals the gap between the upper end of the lower connector and the cable core signal line.

[0011] Furthermore, the cable armor locking mechanism includes an upper sealing screw, a cable sealing cylinder, and a lower sealing screw. The upper sealing screw has a cable passage channel at its center, and the lower sealing screw has a cable core signal line passage channel at its center. The upper end of the upper sealing screw is connected and fixed to the inner wall of the primary retrieval head mechanism, and the lower end of the upper sealing screw is connected to the cable sealing cylinder. The lower end of the cable sealing cylinder is connected to the lower sealing screw.

[0012] Furthermore, the primary sealing structure of the cable includes a multi-stage sealing element disposed on the upper inner wall step of the primary retrieval head mechanism. The multi-stage sealing element includes multiple sealing rubber pads, with a copper pad disposed between two adjacent sealing rubber pads. A clamping screw I with a central through hole is disposed at the upper end of the multi-stage sealing element. The clamping screw I is connected to the upper inner wall of the primary retrieval head mechanism and can compress the multi-stage sealing element, thereby sealing the gap between the cable and the primary retrieval head mechanism.

[0013] Furthermore, the cable secondary sealing structure includes a sealing end gasket disposed on the inner wall step of the lower end of the primary retrieval head mechanism. The upper end of the cable armor locking mechanism is connected to the inner wall of the primary retrieval head mechanism and can squeeze the sealing end gasket, thereby sealing the gap between the upper end of the cable armor locking mechanism and the cable.

[0014] Furthermore, the primary sealing structure of the signal line includes a sealing rubber pad and a clamping screw II. A copper pad and a sealing rubber pad are provided on the step of the lower inner wall of the cable armor locking mechanism. The clamping screw II is connected to the lower inner wall of the cable armor locking mechanism and can squeeze the sealing rubber pad, thereby sealing the gap between the lower end of the cable armor locking mechanism and the cable core signal line.

[0015] Furthermore, the signal line secondary sealing structure includes a multi-stage sealing element disposed on the inner wall step at the upper end of the secondary retrieval head. The multi-stage sealing element includes multiple sealing rubber pads, with a copper pad disposed between two adjacent sealing rubber pads. A clamping screw III with a central through hole is disposed at the upper end of the multi-stage sealing element. The clamping screw III is connected to the inner wall at the upper end of the secondary retrieval head and can compress the multi-stage sealing element, thereby sealing the gap between the secondary retrieval head and the cable core signal line.

[0016] Furthermore, the three-stage sealing structure of the signal line includes a multi-stage sealing element disposed on the inner wall step of the upper end of the lower connector. The multi-stage sealing element includes multiple sealing rubber pads, with a copper pad disposed between two adjacent sealing rubber pads. A clamping screw IV with a central through hole is disposed at the upper end of the multi-stage sealing element. The clamping screw IV is connected to the inner wall of the upper end of the lower connector and can compress the multi-stage sealing element, thereby sealing the gap between the upper end of the lower connector and the signal line of the cable core.

[0017] Furthermore, the winding structure of the limiting structure is as follows: the cable armor layer includes an inner cable armor and an outer cable armor. The locking coil is wound once on the outside of the inner cable armor. The end of the inner cable armor is folded back and covers the locking coil wound once on the outside of the inner cable armor. The locking coil is wound a second time on the folded-back outer of the inner cable armor. The locking coil is wound a third time on the outside of the outer cable armor. The end of the outer cable armor is folded back and covers the locking coil wound a third time on the outside of the outer cable armor. The locking coil is wound a fourth time on the folded-back outer of the outer cable armor.

[0018] Furthermore, the locking coil is made of copper wire.

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

[0020] 1. It adopts a multi-stage sealing structure, which has a good sealing effect, meets the insulation requirements, avoids liquid ingress short circuit between the signal line and the logging instrument interface, and ensures smooth signal transmission.

[0021] 2. By winding the locking coil, the upper limit of the tension that the cable armor locking mechanism can withstand can be estimated by the number of windings. Therefore, when the logging instrument gets stuck, the tension can be controlled to avoid excessive force that exceeds the upper limit of the tension that the cable armor locking mechanism can withstand, causing the logging instrument to fall into the well or the cable to break.

[0022] 3. The upper and lower parts are connected by shear screws. When the logging instrument gets stuck in the well, the screws are sheared when the cable is pulled up to the threshold, so as not to break the cable and reduce losses. Attached image description:

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the limiting structure. Detailed implementation method:

[0026] like Figure 1 As shown, a fully enclosed cable connector includes a main body shell, a cable armor locking mechanism, a multi-level cable sealing structure, and a multi-level sealing structure for the cable core signal wire;

[0027] The main body shell includes a primary retrieval head mechanism, a secondary retrieval head 14, and a lower connector 16. The primary retrieval head mechanism includes a primary retrieval head 3 and an outer sealing cylinder 11. The lower outer wall of the primary retrieval head 3 is sealed to the outer sealing cylinder 11. The lower end of the outer sealing cylinder 11 is connected to the secondary retrieval head 14 through a shear pin 13. The lower inner wall of the secondary retrieval head 14 is sealed to the lower connector 16. The lower inner wall of the lower connector 16 is connected to a male connector 18. The lower outer wall of the lower connector 16 is connected to a protective cap 17. The lower connector 16 and the protective cap 17 are sealed by a sealing ring.

[0028] The cable armor locking mechanism is connected and fixed to the inner wall of the primary retrieval head mechanism. The lower part of the cable 5 that passes through the cable armor locking mechanism has its armor layer stripped to form a cable core signal line 2. The cable core signal line 2 passes through the first-level sealing structure, the second-level sealing structure, and the third-level sealing structure in sequence. The core wire of the cable core signal line 2 is connected to the male connector 18. The armor layer at the end of the cable 5 is wound and locked by the locking coil 8 to form a limiting structure that is limited within the cable armor locking mechanism.

[0029] The cable armor locking mechanism includes an upper sealing screw 6, a cable sealing cylinder 7, and a lower sealing screw 9. The upper sealing screw 6 has a cable passage channel in the center, and the lower sealing screw 9 has a cable core signal line passage channel in the center. The upper end of the upper sealing screw 6 is connected and fixed to the lower inner wall of the primary retrieval head 3. The lower end of the upper sealing screw 6 is connected to the cable sealing cylinder 7, and the lower end of the cable sealing cylinder 7 is connected to the lower sealing screw 9.

[0030] The multi-stage sealing structure of the cable includes a primary sealing structure and a secondary sealing structure. The primary sealing structure seals the gap between the cable 5 and the primary retrieval head mechanism, and the secondary sealing structure seals the gap between the upper end of the cable armor locking mechanism and the cable 5.

[0031] The multi-stage sealing structure of the cable core signal line includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure. The primary sealing structure seals the gap between the lower end of the cable armor locking mechanism and the cable core signal line 2. The secondary sealing structure seals the gap between the secondary retrieval head 14 and the cable core signal line 2. The tertiary sealing structure seals the gap between the upper end of the lower connector 16 and the cable core signal line 2.

[0032] The primary sealing structure of the cable includes a multi-stage sealing element set on the inner wall step of the upper end of the primary retrieval head 3. The multi-stage sealing element includes multiple sealing rubber pads, and a copper pad is set between two adjacent sealing rubber pads. A clamping screw I1 with a central through hole is set at the upper end of the multi-stage sealing element. The clamping screw I1 is connected to the inner wall of the upper end of the primary retrieval head 3 and can squeeze the multi-stage sealing element, thereby sealing the gap between the cable 5 and the primary retrieval head 3.

[0033] The cable secondary sealing structure includes a sealing end gasket 4 set on the step of the lower inner wall of the primary retrieval head 3. The upper end of the upper sealing screw 6 is connected to the lower inner wall of the primary retrieval head 3 and can squeeze the sealing end gasket 4, thereby sealing the gap between the upper sealing screw 6 and the cable 5.

[0034] The primary sealing structure of the signal line includes a sealing rubber pad and a clamping screw II10. A copper pad and a sealing rubber pad are provided on the step of the lower inner wall of the lower sealing screw 9. The clamping screw II10 is connected to the lower inner wall of the lower sealing screw 9 and can squeeze the sealing rubber pad, thereby sealing the gap between the lower end of the lower sealing screw 9 and the signal line 2 of the cable core.

[0035] The signal line secondary sealing structure includes a multi-stage sealing element disposed on the inner wall step of the upper end of the secondary retrieval head 14. The multi-stage sealing element includes multiple sealing rubber pads, with a copper pad disposed between two adjacent sealing rubber pads. A clamping screw III12 with a central through hole is disposed at the upper end of the multi-stage sealing element. The clamping screw III12 is connected to the inner wall of the upper end of the secondary retrieval head 14 and can compress the multi-stage sealing element, thereby sealing the gap between the secondary retrieval head 14 and the cable core signal line 2.

[0036] The signal line three-stage sealing structure includes a multi-stage sealing element set on the upper inner wall step of the lower connector 16. The multi-stage sealing element includes multiple sealing rubber pads, and a copper pad is set between two adjacent sealing rubber pads. The upper end of the multi-stage sealing element is provided with a clamping screw IV15 with a central through hole. The clamping screw IV15 is connected to the upper inner wall of the lower connector 16 and can squeeze the multi-stage sealing element, thereby sealing the gap between the upper end of the lower connector 16 and the cable core signal line 2.

[0037] like Figure 2As shown, the winding structure of the limiting knot is as follows: the cable armor layer includes an inner cable armor 19 and an outer cable armor 20. The locking coil 8 is wound once around the outside of the inner cable armor 19. The end of the inner cable armor 19 is folded back and covers the locking coil 8 that is wound once around the outside of the inner cable armor 19. The locking coil 8 is wound a second time around the folded-back inner cable armor 19. The locking coil 8 is wound a third time around the outside of the outer cable armor 20. The end of the outer cable armor 20 is folded back and covers the locking coil 8 that is wound a third time around the outside of the outer cable armor 20. The locking coil 8 is wound a fourth time around the folded-back outer cable armor 20.

[0038] The primary retrieval head 3 is sealed with a sealing ring between itself and the outer sealing cylinder 11, between the outer sealing cylinder 11 and the secondary retrieval head 14, and between the secondary retrieval head 14 and the lower connector 16.

[0039] In use, unscrew the cap 17, and the male connector 18 of this utility model is connected to the female connector of the logging instrument.

[0040] The gap between the sealing gasket and cable 5 is controlled by adjusting the clamping screw I1 for initial sealing. The gap between the sealing gasket and the cable core signal line 2 is controlled by adjusting the clamping screw II10 for secondary sealing. The gap between the sealing gasket and the cable core signal line 2 is controlled by adjusting the clamping screw III12 for tertiary sealing. The gap between the sealing gasket and the cable core signal line 2 is controlled by adjusting the clamping screw IV15 for quaternary sealing. The sealing end gasket 4 intercepts any water remaining after the initial sealing from entering the cavity of this invention. The upper sealing screw 6 and lower sealing screw 9 have O-rings to keep any remaining water inside the cable sealing cylinder 7, minimizing the amount of liquid flowing into the secondary retrieval head 14. This multi-stage sealing structure provides a good sealing effect, meets insulation requirements, prevents short circuits between the male connector 18 and the logging instrument interface, and ensures smooth signal transmission.

[0041] The locking coil 8 is made of copper wire. The copper wire is wound and locked around the armor layer of the cable 5 to form a limiting structure. It is then fixed to the outer shell through a cable armor locking mechanism, thus bearing the cable tension. The locking force varies depending on the number of turns of the copper wire. The number of turns allows for an estimate of the approximate upper limit of the tension that the cable armor locking mechanism can withstand. Therefore, when the logging instrument gets stuck, this invention can be used to pull the logging instrument, controlling the pulling force and preventing excessive force that exceeds the upper limit of the cable 5's tensile strength, which could cause the logging instrument to fall into the well or the cable to break.

[0042] If the logging instrument still cannot be pulled after applying a force lower than the approximate upper limit that the cable armor locking mechanism can withstand, the retrieval head 3 is pulled up once to break the shear pin 13, separating the upper and lower parts, allowing the cable 5 to be pulled back, protecting the cable 5 and reducing losses. The lower part exposed above the upper part is the lower retrieval head 14, which facilitates retrieval.

[0043] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A fully enclosed cable connector, characterized in that: This includes the main body shell, cable armor locking mechanism, cable multi-level sealing structure, and cable core signal line multi-level sealing structure; The main body shell includes a primary retrieval head mechanism, a secondary retrieval head, and a lower connector. The lower end of the primary retrieval head mechanism is connected to the secondary retrieval head via a shear pin. The lower connector is sealed to the inner wall of the lower end of the secondary retrieval head. The male connector is connected to the inner wall of the lower end of the lower connector. The cable armor locking mechanism is connected and fixed to the inner wall of the primary retrieval head mechanism. The lower part of the cable that passes through the cable armor locking mechanism has its armor layer stripped to form a cable core signal line. The armor layer at the end of the cable is locked by a locking coil to form a limiting structure that is limited within the cable armor locking mechanism. The multi-stage sealing structure of the cable includes a primary sealing structure and a secondary sealing structure. The primary sealing structure seals the gap between the cable and the primary retrieval head mechanism, and the secondary sealing structure seals the gap between the upper end of the cable armor locking mechanism and the cable. The multi-stage sealing structure of the cable core signal line includes a primary sealing structure, a secondary sealing structure, and a tertiary sealing structure. The primary sealing structure seals the gap between the lower end of the cable armor locking mechanism and the cable core signal line. The secondary sealing structure seals the gap between the secondary retrieval head and the cable core signal line. The tertiary sealing structure seals the gap between the upper end of the lower connector and the cable core signal line.

2. The fully enclosed cable connector according to claim 1, characterized in that: The cable armor locking mechanism includes an upper sealing screw, a cable sealing cylinder, and a lower sealing screw. The upper sealing screw has a cable passage channel at its center, and the lower sealing screw has a cable core signal line passage channel at its center. The upper end of the upper sealing screw is connected and fixed to the inner wall of the primary retrieval head mechanism, and the lower end of the upper sealing screw is connected to the cable sealing cylinder. The lower end of the cable sealing cylinder is connected to the lower sealing screw.

3. The fully enclosed cable connector according to claim 1, characterized in that: The primary sealing structure of the cable includes a multi-stage sealing element set on the inner wall step of the upper end of the primary retrieval head mechanism. The multi-stage sealing element includes multiple sealing rubber gaskets, and a copper gasket is set between two adjacent sealing rubber gaskets. A clamping screw I with a central through hole is set at the upper end of the multi-stage sealing element. The clamping screw I is connected to the inner wall of the upper end of the primary retrieval head mechanism and can squeeze the multi-stage sealing element, thereby sealing the gap between the cable and the primary retrieval head mechanism.

4. The fully enclosed cable connector according to claim 1, characterized in that: The cable secondary sealing structure includes a sealing end gasket disposed on the inner wall step of the lower end of the primary retrieval head mechanism. The upper end of the cable armor locking mechanism is connected to the inner wall of the primary retrieval head mechanism and can squeeze the sealing end gasket, thereby sealing the gap between the upper end of the cable armor locking mechanism and the cable.

5. The fully enclosed cable connector according to claim 1, characterized in that: The primary sealing structure of the signal line includes a sealing rubber pad and a clamping screw II. A copper pad and a sealing rubber pad are provided on the step of the lower inner wall of the cable armor locking mechanism. The clamping screw II is connected to the lower inner wall of the cable armor locking mechanism and can squeeze the sealing rubber pad, thereby sealing the gap between the lower end of the cable armor locking mechanism and the cable core signal line.

6. The fully enclosed cable connector according to claim 1, characterized in that: The signal line secondary sealing structure includes a multi-stage sealing element set on the inner wall step at the upper end of the secondary retrieval head. The multi-stage sealing element includes multiple sealing rubber gaskets, and a copper gasket is set between two adjacent sealing rubber gaskets. A clamping screw III with a central through hole is set at the upper end of the multi-stage sealing element. The clamping screw III is connected to the inner wall at the upper end of the secondary retrieval head and can squeeze the multi-stage sealing element, thereby sealing the gap between the secondary retrieval head and the cable core signal line.

7. The fully enclosed cable connector according to claim 1, characterized in that: The signal line three-stage sealing structure includes a multi-stage sealing element set on the inner wall step of the upper end of the lower connector. The multi-stage sealing element includes multiple sealing rubber pads, and a copper pad is set between two adjacent sealing rubber pads. The upper end of the multi-stage sealing element is provided with a clamping screw IV with a central through hole. The clamping screw IV is connected to the inner wall of the upper end of the lower connector and can compress the multi-stage sealing element, thereby sealing the gap between the upper end of the lower connector and the signal line of the cable core.

8. The fully enclosed cable connector according to claim 1, characterized in that: The winding structure of the limiting knot is as follows: The cable armor layer includes an inner cable armor and an outer cable armor. The locking coil is wound once on the outside of the inner cable armor. The end of the inner cable armor is folded back and covers the locking coil that is wound once on the outside of the inner cable armor. The locking coil is wound a second time on the folded-back outer of the inner cable armor. The locking coil is wound a third time on the outside of the outer cable armor. The end of the outer cable armor is folded back and covers the locking coil that is wound a third time on the outside of the outer cable armor. The locking coil is wound a fourth time on the folded-back outer of the outer cable armor.

9. The fully enclosed cable connector according to claim 1, characterized in that: The locking coil is made of copper wire.

Images