CN101691837B - Detonation energization explosion-propagating device for perforating gun string - Google Patents
Detonation energization explosion-propagating device for perforating gun string Download PDFInfo
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- CN101691837B CN101691837B CN200910170879.3A CN200910170879A CN101691837B CN 101691837 B CN101691837 B CN 101691837B CN 200910170879 A CN200910170879 A CN 200910170879A CN 101691837 B CN101691837 B CN 101691837B
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Abstract
The invention discloses a detonation energization explosion-propagating device for a perforating gun string, which comprises a body, an energizer, two detonating cords, two explosion-propagating tubes and a centralizing ring, wherein the energizer is an ignition explosion-expanding tube consisting of a tube body, an ignition charge and explosion-expanding tube. The energizer is positioned in the middle part of the body and is centralized by the centralizing ring, and two sides of the energizer are successively provided with the explosion-propagating tubes and the detonating cords which are centralized by two centralizing sleeves. When the perforating gun string is formed, two ends of the body are connected with an upper perforating gun and a lower perforating gun respectively, and the other ends of the two detonating cords are connected with perforating bullets in the corresponding perforating guns respectively. The detonation energization explosion-propagating device is assembled between each two sections of the perforating guns and interlayer guns of the perforating gun string for oil-gas wells, solves the problems of reliable perforations and reliable explosion propagations of the interlayer guns of the prior perforating gun string, can well avoid rework accidents such as incomplete perforations, gun blockages and the like caused by insufficient self-energies of explosion-propagating materials and the losses and the attenuation of detonation wave energies in the transmission process, increases the reliability of the perforations, and improves the safety of perforation completion.
Description
Technical field
The present invention relates to a kind of explosive, relate in particular to a kind of detonation energization explosion-propagating device that oil, gas well perforation propagation of explosion sequence are used that is applicable to.
Background technology
Along with the development of perforating technology, well depth is in continuous extension, and oil tube transmission perforation well section and perforating gun string are more and more longer, and perforating gun string reaches hundreds of rice and even goes up km, and the reliability of its propagation of explosion sequence is very important.Perforating gun string is the series connection of branched perforating gun, and the length of perforating gun string is identical with the length of perforated interval, is a kind of propagation of explosion sequence the longest in all propagation of explosion sequences.All adopt at present the mode of original rifle (single, double) joint serial connection more piece perforating gun for the perforating gun string of perforation.Detonation wave is ignited after first segment perforating gun from rifle head initiator, successively each joint perforating gun is ignited by connection rifle (single, double) joint.Every joint perforating gun is to lean on a detonating fuse propagation of explosion and ignite perforating bullet to reach perforation object.Therefore the output energy size of detonating fuse plays vital effect to detonating of perforating bullet with perforation effect.Between perforating gun and perforating gun, be by the upper and lower detonating primer in connection rifle (single, double) joint, the detonation wave of the detonating fuse in two rifles to be coupled together, the detonation wave stable delivery of hundreds of perforating guns is gone down.
Conventionally, the propagation of explosion sequence of perforating gun string is: initiator → lower detonating primer → detonating fuse → upper detonating primer → lower detonating primer → detonating fuse → ... → coda bullet.But, as the detonating fuse of one of perforating gun string propagation of explosion sequence critical piece often because of explosive payload, the inhomogeneous even cutoff fault of detonation that occurs of degree of packing; In addition, affect because the diametric(al) of detonating fuse is subject to rarefaction wave, cause detonation energy constantly to be decayed, this is for being arranged in the detonating fuse of interlayer gun, and this detonation wave decay is even more serious, even detonation energy can be changed into detonation and causes cutoff.And as two detonating primer of perforating gun string propagation of explosion sequence critical piece owing to there being certain interval between its upper and lower detonating primer in assembling process, after detonating fuse is gone into the well, meeting high temperature produces while contraction, can make distance between upper and lower detonating primer strengthen and exceed the propagation of explosion distance of permission, causing detonation propagation reliability of nonel tube to decline; In addition, for ease of easy to use, upper and lower detonating primer generally all adopts identical structure, thereby causes the detonation energy making in upper and lower detonating primer not mate; The more important thing is, in use between upper and lower detonating primer, inevitably have eccentric phenomena, when bias is serious, be difficult to the detonation energy of detonating fuse decay to increase again.
Above-mentioned these problems of mentioning, all will cause interrupting perforating job, and this not only can waste not perforation equipment, increase danger also can to these equipment of processing, the more important thing is dead chick hole again, and this tends to lose the best opportunity that perforation recovers the oil.Therefore, the propagation of explosion sequence of the long distance of development, multinode, high reliability, high security is very necessary.
summary of the invention
The technical problem to be solved in the present invention is, overcomes the quality problems that current existing oil, gas well perforating gun string propagation of explosion sequence easily produce, and provides a kind of simple in structure, and can constantly promote the detonation energization explosion-propagating device of perforation propagation of explosion sequence detonation energy.
For solving the problems of the technologies described above, detonation energization explosion-propagating device provided by the invention comprises body, energizer, two supporting positive covers, two detonating primers, two detonating fuses and righting circle, between described body two ends, be provided with successively the first to the 5th installing hole communicating, body outer wall two ends are provided with external screw thread; The igniting propagation squib that described energizer comprises housing and contains body, ignition charge and propagation squib, one end and ignition charge that propagation squib is positioned at body are pressed in body, housing outer wall is with cannelure and described righting circle is installed, igniting propagation squib be fixed in the endoporus of housing and one end of propagation squib and an end face of housing concordant; Described supporting positive cover joins with small end and the cylindrical hole of cylindrical hole and taper hole and taper hole; First, second detonating primer respectively and corresponding being contained in the cylindrical hole of first, second supporting positive cover, the first termination of first, second detonating fuse respectively and corresponding be connected with first, second detonating primer and the second termination by drawing in described taper hole; Described the first supporting positive cover, described energizer and described the second supporting positive cover are all placed in described body, wherein, the first supporting positive cover is arranged in the first and second installing holes, energizer is arranged in the 3rd installing hole by the righting of described righting circle, the second supporting positive cover be arranged in the 4th and the 5th installing hole and described the second detonating primer adjacent with described propagation squib; In the time of described detonation energization explosion-propagating device and perforating gun composition perforating gun string, two external screw threads of described body are connected with upper perforating gun and lower perforating gun respectively, the second detonating primer in the second detonation energization explosion-propagating device that install with this perforating gun top after via the perforating bullet of upper perforating gun the second termination of the first detonating fuse is connected, and the second termination of the 3rd detonating fuse is connected with the first detonating primer in the second detonation energization explosion-propagating device of this rifle below installation after via the perforating bullet of lower perforating gun.
According to the present invention, one end of described first, second supporting positive cover is all greater than the length of the second supporting positive cover with the length of external screw thread and the first supporting positive cover; When composition perforating gun string, the external screw thread of described the first supporting positive cover is connected with the boss of the solid diving board of upper perforating gun and this boss is positioned in the first installing hole of described body, and the external screw thread of described the second supporting positive cover is connected with the boss of the solid diving board of rifle of lower perforation and this boss is positioned in the 5th installing hole of described body.
The present invention also comprises a pressure cap, and pressure cap is convex cylindrical and with central through hole, bossing is with external screw thread; Described body is made up of the first split and the second split, first split one end is with external screw thread, between two ends, being provided with internal thread hole, the first supporting positive cover installing hole and first hole of reeving, hole and first of reeving is positioned at and is with externally threaded one end, the second split two ends are all with external screw thread and central through hole, and central through hole is made up of pressure cap installing hole, the second supporting positive cover installing hole and second hole of reeving; On the equal in length and outer wall of first, second supporting positive cover all with two annular nosings; The first supporting positive cover is placed in the first supporting positive cover installing hole and the second termination of the first detonating fuse is passed by first hole of reeving, described pressure cap, the second supporting positive cover are placed on respectively in described pressure cap installing hole and the second supporting positive cover installing hole and reeve in hole and pass by second in the second termination of described the second detonating fuse, the external screw thread of the first split is connected with upper perforating gun, and another male end of the second split is connected with lower perforating gun.
According to the present invention, described ignition charge is successively increased progressively by described body port to the drug-pressuring pressure between described propagation squib.
Beneficial effect of the present invention is embodied in the following aspects.
(1) the present invention by body by two detonating fuses, two detonating primers and energizer are organically connected as a single entity and have replaced the connection gun joint of existing perforating gun string, because energizer is made up of ignition charge and propagation squib and can be by detonation wave, combustion wave and flame gas reliable ignition, therefore, after the detonating fuse and detonating primer effect being connected with upper perforating gun, what no matter export is detonation or combustion flame, can ignite reliably the ignition charge of energizer, along with the continuous increase of the drug-pressuring pressure of ignition charge, detonation wave speed also constantly increases, ignite reliably again immediately propagation squib, the detonation wave of propagation squib output is then ignited the detonating primer or the detonating fuse that are connected with lower perforating gun.Under the energizer effect between every two perforating guns, can ensure the maximum perforation power of perforating bullet, and then increase the one-time success rate of perforating job.
(2) the present invention is by the centralizing function of two supporting positive covers and righting circle, ensure the concentricity having had between energizer and two detonating primers, thereby guarantee the energization effect of energizer, in addition, ignition charge in energizer has adopted different drug-pressuring pressures, energy that thus can Matching installation two detonating primers in upper perforating gun and lower perforating gun, thus make the propagation of explosion sequence of perforating gun string with stable detonation energy transmission, ensure that the perforating bullet in a perforating gun has maximum puncture effect.
(3) the invention provides the detonation energization explosion-propagating device of single joint and two kinds of form of structure of twin adapter, can select one of them device according to the connect difference of rifle mode of perforating gun.Adopt perforating gun string of the present invention in the structure that neither changes existing perforating gun string without increasing perforation element, the difficulty that does not increase perforating application does not increase on the basis of perforation blind area, has substantially solved the problem of the reliable perforation of existing perforating gun string and the reliable propagation of explosion of interlayer gun yet; Can avoid well because of the loss in transmittance process of the deficiency of boosting explosive material self-energy and detonation wave energy, perforation that decay causes not exclusively, the generation of the accidents of doing over again such as card rifle, increased the reliability of perforation, and improved the safety of perforation completion.
Brief description of the drawings
Fig. 1 is the structure composition schematic diagram of detonation energization explosion-propagating device the first preferred embodiment.
Fig. 2 is the body construction schematic diagram shown in Fig. 1.
Fig. 3 is the supporting positive cover structural representation shown in Fig. 1.
Fig. 4 is the energizer structural representation shown in Fig. 1.
The annexation of Fig. 5 first preferred embodiment of the invention and upper and lower perforating gun.
Fig. 6 is the structure composition schematic diagram of detonation energization explosion-propagating device the second preferred embodiment.
Fig. 7 is the annexation schematic diagram of the first split shown in Fig. 6 and the second split.
Fig. 8 is the annexation of second preferred embodiment of the invention and upper and lower perforating gun.
Detailed description of the invention
Below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in further detail.
As shown in Figure 1, first preferred embodiment of the invention be single joint detonation energization explosion-propagating device comprise body 1, energizer 3, the first supporting positive cover 6-1, the second supporting positive cover 6-2, two detonating fuse 7-1 and 7-2, two detonating primer 8-1 and 8-2, righting circle 15.Body 1 is for middle part is with the cylinder of the outer nosing of a circle and select 35CrCo material to make, its inside is provided with five installing holes that communicate along axis, on the external cylindrical surface of outer nosing both sides, be equipped with two seal grooves and external screw thread, outer nosing is provided with two symmetrically arranged Card trough 1A that use when well head hangs rifle, this groove is square groove, its hem width 18～22mm, dark 9～20mm.Five installing holes on body 1 are respectively first, second, third, fourth and fifth installing hole (by Fig. 2 definition) by left end to right-hand member, first and the size of the 5th installing hole and perforating gun in the boss of solid diving board 5 or 11 match, the overall dimensions of the overall dimensions of the 3rd installing hole and energizer 3 match.The first supporting positive cover 6-1 and the second supporting positive cover 6-2 all can be made by common 45 steel or nonmetals, identical but the second supporting positive cover 6-2 length longer (referring to Fig. 3) of both form of structure, be that one end is made up of cylindrical hole and bellmouth with external screw thread and centre bore, the small end of bellmouth is connected with cylindrical hole, the diameter of cylindrical hole is 6.9～7mm, just in time matches with the external diameter of detonating primer 8-1,8-2.The effect of this centre bore is by detonating fuse 7-1,7-2 and detonating primer 8-1,8-2 righting, and the bias minimum between two detonating primers is guaranteed reliable propagation of explosion between perforating gun 9,10.Energizer 3 contains housing 12 and igniting propagation squib 13 (referring to Fig. 4).Housing 12 is the cylindrical housings that adopt common 45 steel to process, and its outer wall is with circumferential recess 12A and circular orientation face.Igniting propagation squib 13 is made up of body 13A, ignition charge 11 and propagation squib 14, highdensity detonating explosive is housed in propagation squib 14, propagation squib 14 is loaded on one end of body 13A, ignition charge 11 is pressed in body 13A and by body 13A port to the drug-pressuring pressure between propagation squib and successively increases progressively, near the pressure maximum at propagation squib 14 places.Igniting propagation squib 13 is fixed in housing 12 and ensures propagation squib 14 align with the smaller diameter end of housing 12 (in one plane) with cementing agent.Article two, detonating fuse 7-1,7-2 and two detonating primer 8-1,8-2 are the general detonating primer of perforating gun string and detonating fuse.Righting circle 15 adopts the temperature-resistant material such as rubber ring or annular felt pan to make.
Shown in Fig. 5, carry out before perforating job, can be by following first preferred embodiment of the invention case process and perforating gun composition perforating gun string.The middle part of the first detonating fuse 7-1 is arranged on after the perforating bullet of perforating gun 9, its two ends is passed by the centre bore two ends of the solid diving board 5 of upper perforating gun respectively, one of them termination is connected with the first detonating primer 8-1, and the second detonating primer 8-2 of another termination and in the second detonation energization explosion-propagating device matching between its top perforating gun is connected; The middle part of the second detonating fuse 7-2 is arranged on after the perforating bullet of lower perforating gun 10, two ends is passed at the two ends of the centre bore of diving board 11 admittedly by upper perforating gun respectively, one of them termination is connected with the second detonating primer 8-2, and the first detonating primer 8-1 of another termination and in the 3rd detonation energization explosion-propagating device matching between its below perforating gun is connected; First, second detonating primer 8-1,8-2 insert respectively the centre bore of first, second supporting positive cover 6-1,6-2, the male end of the first supporting positive cover 6-1 is connected with solid diving board 5 boss of upper perforating gun, and the external screw thread of the second supporting positive cover 6-2 is connected with the boss of the solid diving board 11 of lower perforating gun.After putting sealing ring to four seal grooves on body 1, the interior connecting thread of lower perforating gun 10 is connected with the external screw thread of body 1 one end, the boss of the solid diving board 11 of lower perforating gun is positioned in the 5th installing hole in body 1, the second supporting positive cover 6-2 has been placed in the 4th installing hole in body 1, again righting circle 15 is arranged in the 3rd installing hole of energizer 3 use special tools being shifted after the circumferential recess 12A of housing 12 onto to body 1 and by 15 rightings of righting circle, and it is adjacent with the second detonating primer 8-2 to make to be equipped with one end of propagation squib 14.Perforating gun 9 connects with the external screw thread of body 1 other end, the protruding end of the solid diving board 5 of upper perforating gun is positioned in the first installing hole in body 1, and the first supporting positive cover 6-1 is enclosed in the second installing hole of body 1, make to be equipped with one end of the first detonating primer 8-1 adjacent with the ignition charge end of energizer 3.
It is that twin adapter detonation energization explosion-propagating device and the first preferred embodiment difference are that Fig. 6 shows second preferred embodiment of the invention, the second preferred embodiment has increased a pressure cap 4, and body 1 is made up of two split 1-1,1-2 and the external form of supporting positive cover 6-1,6-2 changes to some extent.Pressure cap 4 is the convex cylindrical with central through hole, and bossing is with external screw thread and seal groove, and energizer 3 is bonded in the central through hole of pressure cap 4 and by 15 rightings of righting circle.Equal in length and the outer wall of two supporting positive cover 6-1,6-2 changes two annular nosings into by external screw thread.The outer wall of the first split 1-1 is the cylinder (referring to Fig. 7) of two diameters, on small cylinder with two seal grooves and external screw thread, three holes and the largest hole that are provided with by small cylinder to large cylinder direction that diameter changes from small to big are one by one screw, inferior macropore is the first supporting positive cover installing hole, and aperture is first hole of reeving.The external form of the second split 1-2 is identical with the external form of body 1, but its centre bore is diameter three hole compositions from large to small, maximum installing hole is pressure cap installing hole, its overall dimensions and pressure cap 4 match and this hole is also provided with circular orientation face, internal thread and seal groove, inferior macropore is the second supporting positive cover installing hole, and minimum aperture is second hole of reeving.On pressure cap 4, install in the pressure cap installing hole that is screwed into the second split 1-2 after sealing ring and both circular orientation faces contact.
Shown in Fig. 8, need to form perforating gun string when carrying out perforating job time, first, the second detonating fuse 7-1, a termination of 7-2 is respectively from upper, the solid diving board 5 of lower perforating gun, 11 centre bore passes rear with corresponding first, the second detonating primer 8-1, after 8-2 connects, the external screw thread of the external screw thread of the first split 1-1 and the second split 1-2 respectively with perforating gun 9, 10 internal thread connects, first, the second supporting positive cover 6-1, 6-2 is placed on respectively first, in the second supporting positive cover installing hole, first, the second detonating fuse 7-1, 7-2 and corresponding detonating primer 8-1 thereof, 8-2 is passed by first of the first split 1-1 second of hole and the second split 1-2 hole of reeving of reeving respectively, and corresponding insertion first, in the centre bore of the second supporting positive cover.Put after sealing ring to two seal grooves on the second split 1-2, be connected with the internal thread of the first split 1-1.
Claims (4)
1. a detonation energization explosion-propagating device for perforating gun string, comprise body [1], two detonating primers [8-1,8-2] and two detonating fuses [7-1,7-2], it is characterized in that: also comprise energizer [3], two supporting positive covers [6-1,6-2] and righting circle [15], between described body [1] two ends, be provided with successively the first to the 5th installing hole communicating, body [1] outer wall two ends are provided with external screw thread; The igniting propagation squib [13] that described energizer [3] comprises housing [12] and contains body [13A], ignition charge [11] and propagation squib [14], one end and ignition charge [11] that propagation squib [14] is positioned at body [13A] are pressed into body [13A], housing [12] outer wall is with cannelure [12A] and described righting circle [15] is installed, body [13A] be fixed in the endoporus of housing [12] and one end of propagation squib [14] and an end face of housing [12] concordant; Described supporting positive cover [6-1,6-2] joins with small end and the cylindrical hole of cylindrical hole and taper hole and taper hole; First, second detonating primer [8-1,8-2] respectively and correspondence be contained in the cylindrical hole of first, second supporting positive cover [6-1,6-2], first termination of first, second detonating fuse [7-1,7-2] respectively and corresponding be connected with first, second detonating primer [8] and the second termination by drawing in described taper hole; Described the first supporting positive cover [6-1], described energizer [3] and described the second supporting positive cover [6-2] are all placed in described body [1], wherein, the first supporting positive cover [6-1] is arranged in the first and second installing holes, energizer [3] is arranged in the 3rd installing hole by described righting circle [15] righting, the second supporting positive cover [6-2] be arranged in the 4th and the 5th installing hole and described the second detonating primer adjacent with described propagation squib [14]; In the time of described detonation energization explosion-propagating device and perforating gun composition perforating gun string, two external screw threads of described body [1] are connected with upper perforating gun [9] and lower perforating gun [10] respectively, the second detonating primer [8-2] in the second detonation energization explosion-propagating device that install with this perforating gun top after via the perforating bullet of upper perforating gun [9] the second termination of the first detonating fuse [7-1] is connected, and the second termination of the second detonating fuse [7-2] is connected with the first detonating primer [8-1] in the 3rd detonation energization explosion-propagating device of this rifle below installation after via the perforating bullet of lower perforating gun [10].
2. detonation energization explosion-propagating device for perforating gun string according to claim 1, is characterized in that: one end of described first, second supporting positive cover [6-1,6-2] is all greater than the length of the second supporting positive cover [6-2] with the length of external screw thread and the first supporting positive cover [6-1]; When composition perforating gun string, the external screw thread of described the first supporting positive cover [6-1] is connected with the boss of the solid diving board [5] of upper perforating gun [9] and this boss is positioned in the first installing hole of described body [1], and the external screw thread of described the second supporting positive cover [6-2] is connected with the boss of the solid diving board [11] of rifle of lower perforation [10] and this boss is positioned in the 5th installing hole of described body [1].
3. detonation energization explosion-propagating device for perforating gun string according to claim 1, is characterized in that: also comprise a pressure cap [4], pressure cap [4] is convex cylindrical and with central through hole, bossing is with external screw thread; Described body [1] is made up of the first split [1-1] and the second split [1-2], the first split [1-1] one end is with external screw thread, between two ends, being provided with screw, the first supporting positive cover installing hole and first hole of reeving, hole and first of reeving is positioned at and is with externally threaded one end, the second split [1-2] two ends are all with external screw thread and central through hole, and central through hole is made up of pressure cap installing hole, the second supporting positive cover installing hole and second hole of reeving; On the equal in length and outer wall of first, second supporting positive cover [6-1,6-2] all with two annular nosings; The first supporting positive cover [6-1] is placed in the first supporting positive cover installing hole and the second termination of the first detonating fuse [7-1] is passed by first hole of reeving, described pressure cap [4], the second supporting positive cover [6-2] are placed on respectively in described pressure cap installing hole and the second supporting positive cover installing hole and reeve in hole and pass by second in the second termination of described the second detonating fuse [7-2], the external screw thread of the first split [1-1] is connected with upper perforating gun [9], and another male end of the second split [1-2] is connected with lower perforating gun [10].
4. according to the detonation energization explosion-propagating device for perforating gun string described in claim 1 or 2 or 3, it is characterized in that: described ignition charge [11] is successively increased progressively by described body [13A] port to the drug-pressuring pressure between described propagation squib [14].
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910170879.3A CN101691837B (en) | 2009-09-11 | 2009-09-11 | Detonation energization explosion-propagating device for perforating gun string |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910170879.3A CN101691837B (en) | 2009-09-11 | 2009-09-11 | Detonation energization explosion-propagating device for perforating gun string |
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| CN101691837A CN101691837A (en) | 2010-04-07 |
| CN101691837B true CN101691837B (en) | 2014-08-27 |
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| CN200910170879.3A Active CN101691837B (en) | 2009-09-11 | 2009-09-11 | Detonation energization explosion-propagating device for perforating gun string |
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| US4790385A (en) * | 1983-07-25 | 1988-12-13 | Dresser Industries, Inc. | Method and apparatus for perforating subsurface earth formations |
| US4650009A (en) * | 1985-08-06 | 1987-03-17 | Dresser Industries, Inc. | Apparatus and method for use in subsurface oil and gas well perforating device |
| US5421418A (en) * | 1994-06-28 | 1995-06-06 | Schlumberger Technology Corporation | Apparatus and method for mixing polyacrylamide with brine in an annulus of a wellbore to prevent a cement-like mixture from fouling wellbore tools |
| CN101490363A (en) * | 2006-05-26 | 2009-07-22 | 欧文石油工具有限合伙公司 | Perforating methods and devices for high wellbore pressure applications |
| CN201184175Y (en) * | 2007-08-02 | 2009-01-21 | 黑龙江华安民爆器材有限责任公司 | Perforator capable of reducing interference among cartridges |
| CN201209435Y (en) * | 2008-06-20 | 2009-03-18 | 大庆万事达石油科技有限公司 | Intermediate joint of perforation gun |
| CN201531258U (en) * | 2009-09-11 | 2010-07-21 | 中国兵器工业第二一三研究所 | Detonating and energizing explosion-propagating device for perforating gun strings |
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| US11788389B2 (en) | 2013-07-18 | 2023-10-17 | DynaEnergetics Europe GmbH | Perforating gun assembly having seal element of tandem seal adapter and coupling of housing intersecting with a common plane perpendicular to longitudinal axis |
| US11952872B2 (en) | 2013-07-18 | 2024-04-09 | DynaEnergetics Europe GmbH | Detonator positioning device |
| US11808093B2 (en) | 2018-07-17 | 2023-11-07 | DynaEnergetics Europe GmbH | Oriented perforating system |
| US11814915B2 (en) | 2020-03-20 | 2023-11-14 | DynaEnergetics Europe GmbH | Adapter assembly for use with a wellbore tool string |
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Effective date of registration: 20160810 Address after: 710061 No. 213 rosefinch Avenue, Yanta District, Shaanxi, Xi'an Patentee after: Xi'an Wuhua Energy Exploding Equipment Co.,Ltd. Address before: 710061 No. 213 rosefinch Avenue, Yanta District, Shaanxi, Xi'an Patentee before: No.213 Research Institute of China North Industries Group Corporation |