CN108716373B - Device for holding small-diameter drill rods with four single stand columns - Google Patents
Device for holding small-diameter drill rods with four single stand columns Download PDFInfo
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- CN108716373B CN108716373B CN201810385572.4A CN201810385572A CN108716373B CN 108716373 B CN108716373 B CN 108716373B CN 201810385572 A CN201810385572 A CN 201810385572A CN 108716373 B CN108716373 B CN 108716373B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
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Abstract
The invention relates to a suspension device for four-single-upright-column small-diameter drill rods, which comprises a suspension support arranged on a drill floor, wherein the suspension support is of a U-shaped truss structure, one side of the suspension support is provided with an opening, the top end of the suspension support is horizontally provided with a plurality of finger beams A, one ends of the finger beams A are vertically and fixedly connected to a truss opposite to the opening, the other ends of the finger beams A face the opening and are suspended, the upper plane of each finger beam A is fixedly connected with a plurality of lug seats A, a turnover cylinder A is arranged in the finger beam A below each lug seat A, the lug seats A are rotatably connected with drill rod supporting clamp plates, the drill rod supporting clamp plates are hinged with the turnover cylinders A below the connected lug seats A, and the drill rod supporting clamp plates are also lapped on the upper surfaces of the adjacent finger beams A. The invention relates to a suspension device for four-single-column small-diameter drill rods, which solves the problem that a four-single-column drilling machine cannot stably suspend and discharge four-single-column drill rods built by small-diameter drill rod assemblies with the specifications of 5' and below.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling and well repairing equipment, and particularly relates to a suspension device for a small-diameter drill rod with four single stand columns.
Background
Compared with the traditional three-single-upright-column drilling machine, the four-single-upright-column drilling machine has the advantages that the effective height of the derrick is increased, the mounting height of the racking platform is increased, and four single upright-column drill rods formed by connecting four single drill rods end to end can be arranged, so that the high-speed running section is lengthened when the four-single-upright-column drilling machine starts to run, the starting frequency is greatly reduced, the number of times of tripping on the drill rods during starting to run is reduced, the probability of underground faults and complex conditions is reduced, the drilling machine is an effective means for increasing the speed and the efficiency of the drilling machine, and the popularization and application values are good.
The existing four-single-column drilling machine can only use 51/2 ' and above standard drilling rods to build and discharge four single columns, the small-diameter drilling rods with the specification of 5 ' and below cannot be practically applied due to the problems of large deformation and instability when the small-diameter drilling rods are discharged after the four single columns are built, the drilling rods can only be built and discharged in a three-single-column mode, and the drilling rods with the specification of 5 ' and below are common drilling tools for drilling operation, so that the exertion of the efficient drilling operation capability of the four-single-column drilling machine is greatly limited.
Disclosure of Invention
The invention aims to provide a suspension device for four-single-column small-diameter drill rods, which solves the problem that a four-single-column drilling machine cannot stably suspend and discharge the four-single-column drill rods built by small-diameter drill rod assemblies with the specifications of 5' and below.
The invention adopts the technical scheme that the suspension device of the four-single-upright-column small-diameter drill rod comprises a suspension support arranged on a drill floor, the suspension support is of a U-shaped truss structure, one side of the suspension support is provided with an opening, the top end of the suspension support is horizontally provided with a plurality of finger beams A, one ends of the plurality of finger beams A are vertically and fixedly connected on a truss opposite to the opening, the other ends of the plurality of finger beams A face the opening and are suspended, the upper plane of each finger beam A is fixedly connected with a plurality of ear seats A, the plurality of ear seats A are arranged in a row on the upper plane of the finger beam A, a turnover air cylinder A is arranged in the finger beam A below each ear seat A,
the lug A rotates and is connected with the drilling rod and supports the cardboard, and the drilling rod supports the cardboard and articulates with the upset cylinder A below the lug A that is connected, and the drilling rod supports the cardboard and still overlap joint on adjacent finger A's upper surface.
The present invention is also characterized in that,
the drill rod supporting clamping plate is provided with a semi-circular arc-shaped opening, the orientation of the semi-circular arc-shaped opening is consistent with that of the opening of the suspension support, a chamfer is arranged on the edge of the inner side of the semi-circular arc-shaped opening, and an extension section is arranged at the bottom of the semi-circular arc-shaped opening far away from the opening.
The inner diameter of the semicircular arc-shaped opening is larger than the diameter of the small-diameter drill rod body of the four stand columns and smaller than the outer diameter of the small-diameter drill rod joint of the four stand columns.
The height between the drill rod supporting clamp plate and the table surface of the drill floor is larger than the length of two drill rods at the lower parts of the small-diameter drill rods of the four stand columns.
Still including setting up the racking platform on the derrick, racking platform upper level is provided with many and hangs the parallel finger B of finger A on the support, many finger B's one end links firmly on racking platform, the other end is unsettled, finger B aligns from top to bottom with finger A, finger A unsettled one end is located same one side with finger B unsettled one end, every finger B's last plane is provided with a plurality of ear seats B, a plurality of ear seats B are one on finger B plane, every ear seat B rotates and connects a drilling rod baffle.
And a turning cylinder B is arranged in the finger beam B below each lug seat B, and the drill rod baffle is hinged with the turning cylinder B below the connected lug seat B.
On two fingerboards A and B which are aligned up and down, the drill rod supporting clamping plate on the fingerboard A is positioned between every two adjacent drill rod baffles on the fingerboard B, and the circle center of the semicircular arc-shaped opening of the drill rod supporting clamping plate is aligned with the center of the gap between every two adjacent drill rod baffles.
And a drill rod discharging manipulator is arranged at the bottom of the racking platform and can grab four single-column small-diameter drill rods and move and exchange the drill rods between a wellhead and the suspension frame.
The suspension device for the small-diameter drill rods of the four single columns has the advantages that the suspension support is additionally arranged on the table top of the drilling rig floor, the drill rod joints in the middle of the four single columns of 5' and below specifications are supported, so that the columns are in a suspension state, the length, weight and compressive stress of the compressed rod sections of the columns are greatly reduced, the problem of instability during column discharge is effectively solved, and the small-diameter drill rods can be stably and reliably suspended and discharged on the drilling rig in the form of the four single columns.
Drawings
FIG. 1 is a schematic front structural view of a suspension device for four single-column small-diameter drill rods according to the present invention;
FIG. 2 is a view taken along line C of FIG. 1;
FIG. 3 is a sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic view of a portion of FIG. 3 at I;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 3;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 7 is an enlarged view of a portion of FIG. 6 at II;
FIG. 8 is a cross-sectional view E-E of FIG. 6;
figure 9 is a block diagram of the drill pipe support pallet.
In the figure, 1, a suspension bracket, 2, a finger beam A, 3, an ear seat A, 4, a drill pipe supporting clamping plate, 5, an ear seat B, 6, a drill pipe discharging manipulator, 7, a second-layer platform, 8, a turnover cylinder B, 10, a drill pipe baffle, 12, a turnover cylinder A, 13, four single-column small-diameter drill pipes and 14, a finger beam B are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a structure of a suspension device of a four-single upright small-diameter drill pipe, which is shown in figure 1 and comprises a suspension bracket 1 arranged on a drill floor, wherein the suspension bracket 1 is of a U-shaped truss structure, one side of the suspension bracket 1 is provided with an opening, as shown in figure 3, the top end of the suspension bracket 1 is horizontally provided with a plurality of finger beams A2, one end of each finger beam A2 is vertically and fixedly connected to a truss opposite to the opening, the other end of each finger beam A2 faces the opening and is suspended, as shown in figure 4, the upper plane of each finger beam A2 is fixedly connected with a plurality of lug seats A3, a plurality of lug seats A3 is arranged in a row on the upper plane of a finger beam A2, as shown in figure 5, a turning cylinder A12 is arranged in the finger beam A2 below each lug seat A3,
the lug seat A3 is rotatably connected with a drill rod supporting clamp plate 4, the drill rod supporting clamp plate 4 is hinged with a turnover cylinder A12 below the connected lug seat A3, and the drill rod supporting clamp plate 4 is also lapped on the upper surface of the adjacent finger beam A2 to enable the drill rod supporting clamp plate 4 to more stably support four single-column small-diameter drill rods 13.
As shown in fig. 9, the drill rod supporting clamping plate 4 has a semi-arc opening, the orientation of the semi-arc opening is consistent with the orientation of the opening of the suspension bracket 1, the inner side edge of the semi-arc opening is provided with a chamfer, the bottom of the semi-arc opening is far away from the opening direction and is provided with an extension section, and one outer side of the semi-arc opening of the drill rod supporting clamping plate 4 is provided with two through holes: the drill rod supporting clamp plate 4 is horizontally and vertically overturned for 90 degrees along one side provided with the first through hole and the second through hole, the first through hole is rotatably connected with the lug seat A3 on the finger beam A through a rotating shaft, the second through hole is hinged with the overturning cylinder A on the finger beam A through the rotating shaft, and the axial direction of the first through hole and the second through hole is the same as the orientation of the semicircular arc-shaped opening.
As shown in FIG. 2, the inner diameter of the semi-circular arc opening is larger than the diameter of the rod body of the four single-upright-column small-diameter drill rods 13 and smaller than the outer diameter of the joints of the four single-upright-column small-diameter drill rods 13, so that the joints of the four single-upright-column small-diameter drill rods 13 are clamped in the semi-circular arc opening of the drill rod supporting clamping plate 4, and the four single-upright-column small-diameter drill rods 13 are.
The height of the drill rod supporting clamping plate 4 from the table surface of the drill floor is larger than the length of two drill rods at the lower parts of the four stand column small-diameter drill rods 13.
As shown in fig. 6, the derrick further comprises a second-layer platform 7 arranged on the derrick, a plurality of finger beams B14 parallel to the finger beam a2 on the suspension bracket 1 are horizontally arranged on the second-layer platform 7, one ends of the plurality of finger beams B14 are fixedly connected to the second-layer platform 7, the other ends of the plurality of finger beams B14 are suspended, the finger beams B14 are aligned with the finger beams a2 one by one, the suspended end of the finger beam a2 and the suspended end of the finger beam B14 are located on the same side, as shown in fig. 7, a plurality of ear seats B5 are arranged on the upper plane of each finger beam B14, a plurality of ear seats B5 are arranged on the upper plane of the finger beam B14 in a row, and each ear seat B5 is rotatably connected with one.
As shown in fig. 8, a turning cylinder B8 is arranged in the fingerboard B14 below each lug B5, and the drill rod baffle 10 is hinged with a turning cylinder B8 below the connected lug B5 through a rotating shaft.
On two vertically aligned fingerboards A2 and B14, the drill rod supporting clamp plate 4 on the fingerboard A2 is positioned between every two adjacent drill rod baffles 10 on the fingerboard B14, and the circle center of the semi-circular arc-shaped opening of the drill rod supporting clamp plate 4 is aligned with the center of the gap between every two adjacent drill rod baffles 10.
As shown in fig. 6, a drill rod discharging manipulator 6 is installed at the bottom of the racking platform 7, and the drill rod discharging manipulator 6 can grab four single upright small-diameter drill rods and move and exchange the drill rods between a wellhead and a suspension frame.
The invention relates to a suspension device of four single upright posts and small-diameter drill rods, which has the working principle that: the drill pipe support clamping plate comprises a suspension support 1 of a U-shaped truss structure arranged on a drilling platform surface, a plurality of finger beams A2 of a cantilever structure fixed on the top of the suspension support 1, an ear seat A3 fixed on the upper plane of the finger beam A2, and a drill pipe support clamping plate 4 which is rotatably connected to the ear seat A3 by a rotating shaft and can turn over at 90 degrees in a horizontal state and an upright state; the two-layer platform 7 is arranged on the derrick and leans against four upright posts and small-diameter drill rods 13, a finger beam B14 for discharging a plurality of drill rods, an ear seat B5 fixed on the finger beam B14 and a drill rod baffle plate 10 connected on the ear seat A3 in a rotating mode are arranged in the two-layer platform 7, and the drill rod baffle plate 10 can be pushed by a turnover cylinder B8 to turn over in an upright state and a horizontal state by 90 degrees around the rotating shaft; and a drill rod discharging manipulator 6 arranged at the bottom of the walkway of the racking platform 7; the fingerboard A2 and the fingerboard B14 are both horizontally arranged and aligned up and down; the horizontal distance between every two of the finger beams B14 is larger than the diameter of the large-specification drill rod body with four upright posts; the height between the installation position of the drill rod supporting clamping plate 4 and the drilling platform surface is larger than the length of two drill rods at the lower parts of the four stand column small-diameter drill rods 13, and when the joint seats at the upper ends of the second drill rods, counted from bottom to top, of the four stand column small-diameter drill rods 13 are placed on the drill rod supporting clamping plate 4, the lower ends of the four stand column small-diameter drill rods 13 are in a suspended state; the opening of the drill rod supporting clamp plate 4 is in a semi-circular arc shape, the direction of the semi-circular arc opening is consistent with the direction of the suspended end of the fingerboard A2, and the inner diameter of the semi-circular arc opening is slightly larger than the diameter of the rod body of the suspended four-single-upright-post small-diameter drill rod 13 and smaller than the outer diameter of the joint of the four-single-upright-post small-diameter drill; the inner side edge of the semi-circular opening of the drill rod supporting clamp plate 4 is provided with a chamfer, the two finger beams A2 and the finger beam B14 which are aligned up and down are arranged, the drill rod supporting clamp plate 4 on the finger beam A2 is positioned between every two adjacent drill rod baffles 10 on the finger beam B14, the circle center of the semi-circular opening of the drill rod supporting clamp plate 4 is aligned up and down with the spacing center of every two adjacent drill rod baffles 10, when the cone section of the upper end joint of the second drill rod of the four small-diameter drill rods 13 from bottom to top is wedged into the chamfer surface of the inner side edge of the semi-circular opening of the drill rod supporting clamp plate 4, the circle centers of the cone sections of the joints of the four small-diameter drill rods 13 of the single upright posts and the circle center of the opening of the drill rod supporting clamp plate 4 can be aligned and positioned automatically according to the conical surface matching principle, so that the drill rod supporting clamp plate 4, the whole four upright posts small-diameter drill rods 13 are supported and suspended; after four single-upright-column small-diameter drill rods 13 are suspended on the drill rod supporting clamping plate 4 to be discharged, another drill rod supporting clamping plate 4 with the arc-shaped opening facing the drill rod supporting clamping plate 4 suspending the four single-upright-column small-diameter drill rods 13 is laid flat, a drill rod baffle plate 10 which is close to the four single-upright-column small-diameter drill rods 13 and is close to the suspended end of a finger beam B14 is laid on the flat second-layer platform 7, and then the suspended end of the finger beam A2 of the four single-upright-column small-diameter drill rods 13 on the suspension support 1 and the suspended end of the finger beam B14 of the second-layer platform 7 are sealed, so that the four single-upright-column small-diameter drill rods 13 are restrained in the front-back, left-right and up-down directions on the second-layer platform 7, the four single-upright-column small-diameter drill rods 13 are prevented from swinging around the drill.
The invention relates to a working process of a suspension device for four single upright posts and small-diameter drill rods, which comprises the following steps: when the four single-upright-column small-diameter drill rods 13 need to be suspended and discharged, except for the drill rod supporting clamping plate 4 which is arranged on the suspended support 1 and is farthest from the wellhead, the rest drill rod supporting clamping plates 4 on the suspended support 1 are turned up by using a turning cylinder A12, the four single-upright-column small-diameter drill rods 13 positioned at the wellhead position of the derrick are clamped and suspended to the semi-circular arc-shaped opening of the drill rod supporting clamping plate 4 which is arranged on the suspended support 1 and is farthest from the wellhead before, the suspension height of the four single-upright-column small-diameter drill rods 13 is adjusted by using a drill rod discharge manipulator 6, the upper end connector cone section of the second drill rod from the bottom to the top on the four single-upright-column small-diameter drill rods 13 is wedged and seated on the semi-circular arc-shaped opening edge chamfer surface of the drill rod supporting clamping plate 4, the drill rod supporting clamping plate 4 facing the other drill rod supporting clamping plate 4 of the four single-upright-column small-diameter drill rods 13 is immediately, the extension section of the bottom of the semicircular arc-shaped opening of the drill rod supporting clamping plate 4 far away from the opening direction supports against the four-single-upright-column small-diameter drill rod 13, the drill rod baffle 10 which is close to the four-single-upright-column small-diameter drill rod 13 and is close to the suspended end of the finger beam B14 on the flat second-layer platform 7 is placed, and the four-single-upright-column small-diameter drill rod 13 is constrained in the front-back, left-right and up-down directions of the second-layer platform 7, so that the suspended discharge of the four-single-upright. By analogy, four single-column small-diameter drill rods 13 are suspended in the suspension support 1 in sequence from the farthest to the near direction from the well mouth on the suspension support 1, and are limited by the drill rod baffle 10 on the racking platform 7. When the drilling machine drills down, four single upright post small-diameter drill rods 13 are extracted from the suspension bracket 1, and the working steps are opposite to those of suspension discharge. When the specifications (diameters) of the four single-upright-column drill rods are changed, the drill rod supporting clamping plate 4 matched with the diameters of the four single-upright-column drill rods is replaced. If the drilling machine needs to arrange 51/2' and above four single columns in large specification, the drill rod supporting clamping plate 4 on the suspension support 1 is turned up by 90 degrees, the arrangement space of the drill rod on the suspension support 1 is avoided, and then the drill rods of the four single columns in large specification are leaned on the fingerboard B14 on the racking platform 7.
The hanging structure of the four-single-upright-column small-diameter drill pipe 13 increases the number of the small-diameter upright-column drill pipes arranged on the drilling derrick for connecting single columns, and the tripping operation of three single upright columns is changed into the tripping operation of four single upright columns, so that the times of connecting, fastening and tripping of the drill pipes during tripping construction are reduced, and the drilling efficiency is improved. If the drilling machine needs to arrange 51/2' and above four single columns in large specification, the drill rod supporting clamping plate 4 on the suspension support 1 is turned up to make a space for arrangement, and then the drill rods of the four single columns are leaned on the derrick racking platform 7 to be arranged. According to the suspension device for the four-single-upright-column small-diameter drill rod, the weight of the four-single-upright-column drill rod is borne by the drill floor structure, accessories do not need to be added on a derrick, the weight, the operation load and the safety risk of the derrick are not increased, the problem of stability of the application of the four-single-upright-column small-diameter drill rod 13 with the specification of 5 'or below on a drilling machine is thoroughly solved while the vertical arrangement of the 51/2' and above large-specification four-single-upright-columns on the drill floor is not influenced, and the arrangement and the application of the drilling machine on the four-single-upright-column drill rod with the full-diameter specification are realized.
Claims (6)
1. The utility model provides a suspension device of four single stand minor diameter drilling rods, its characterized in that, including installing suspension support (1) on the rig floor, suspension support (1) is U type truss structure, suspension support (1) one side has the opening, the top level that suspension support (1) was provided with many fingerboards A (2), many the one end of fingerboard A (2) links firmly perpendicularly on the truss relative with the opening, many the other end orientation of fingerboard A (2) the opening is unsettled, every the upper plane of fingerboard A (2) has linked firmly a plurality of ear seats A (3), and a plurality of ear seats A (3) are one in the upper plane of fingerboard A (2), are provided with upset cylinder A (12) in every fingerboard A (2) below ear seat A (3),
the ear seats A (3) are rotatably connected with drill rod supporting clamping plates (4), the drill rod supporting clamping plates (4) are hinged with overturning cylinders A (12) below the connected ear seats A (3), the drill rod supporting clamping plates (4) are also lapped on the upper surfaces of the adjacent finger beams A (2),
the drill rod supporting clamping plate (4) is provided with a semi-arc-shaped opening, the orientation of the semi-arc-shaped opening is consistent with that of the opening of the suspension bracket (1), the edge of the inner side of the semi-arc-shaped opening is provided with a chamfer, the bottom of the semi-arc-shaped opening is provided with an extending section far away from the opening,
the inner diameter of the semicircular arc-shaped opening is larger than the rod body diameter of the four stand column small-diameter drill rods (13) and smaller than the joint outer diameter of the four stand column small-diameter drill rods (13).
2. The suspension device for the four-single-column small-diameter drill pipes as claimed in claim 1, wherein the height of the drill pipe support clamping plate (4) from the surface of the drill floor is greater than the length of two drill pipes at the lower part of the four-single-column small-diameter drill pipe (13).
3. The device for suspending the four-single-column small-diameter drill pipes according to claim 1, further comprising a second-layer platform (7) arranged on the derrick, wherein a plurality of finger beams B (14) parallel to the finger beam A (2) on the suspending support (1) are horizontally arranged on the second-layer platform (7), one ends of the plurality of finger beams B (14) are fixedly connected to the second-layer platform (7), the other ends of the plurality of finger beams B (14) are suspended, the finger beams B (14) are vertically aligned with the finger beam A (2), the suspended end of the finger beam A (2) and the suspended end of the finger beam B (14) are located on the same side, a plurality of lug seats B (5) are arranged on the upper plane of each finger beam B (14), the plurality of lug seats B (5) are in a row on the upper plane of the finger beam B (14), and each lug seat B (5) is rotatably connected with one drill pipe baffle (10).
4. The device for holding four single-column small-diameter drill rods according to claim 3, wherein a turnover cylinder B (8) is arranged in the finger beam B (14) below each lug seat B (5), and the drill rod baffle plate (10) is hinged with the turnover cylinder B (8) below the connected lug seat B (5).
5. The device for suspending the four single-column small-diameter drill pipes according to claim 3, wherein the drill pipe supporting clamping plates (4) on the fingerboards A (2) are positioned between every two adjacent drill pipe baffles (10) on the fingerboards B (14) on the two fingerboards A (2) and the fingerboards B (14) which are aligned up and down, and the centers of the semicircular arc openings of the drill pipe supporting clamping plates (4) are aligned with the centers of gaps between every two adjacent drill pipe baffles (10).
6. The device for suspending the four-single-column small-diameter drill pipe according to claim 3, wherein a drill pipe discharging manipulator (6) is installed at the bottom of the racking platform (7), and the drill pipe discharging manipulator (6) can grab the four-single-column small-diameter drill pipe and move and exchange the four-single-column small-diameter drill pipe between a wellhead and the suspending bracket (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385572.4A CN108716373B (en) | 2018-04-26 | 2018-04-26 | Device for holding small-diameter drill rods with four single stand columns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385572.4A CN108716373B (en) | 2018-04-26 | 2018-04-26 | Device for holding small-diameter drill rods with four single stand columns |
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| Publication Number | Publication Date |
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| CN108716373A CN108716373A (en) | 2018-10-30 |
| CN108716373B true CN108716373B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810385572.4A Active CN108716373B (en) | 2018-04-26 | 2018-04-26 | Device for holding small-diameter drill rods with four single stand columns |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111535758B (en) * | 2020-04-14 | 2021-11-23 | 宝鸡石油机械有限责任公司 | Automatic processing method for 2-single-1-upright-column drilling machine tubular column |
| CN111997538B (en) * | 2020-09-25 | 2022-10-04 | 中油国家油气钻井装备工程技术研究中心有限公司 | Oil rig derrick racking platform device capable of suspending and discharging drill rods |
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Effective date of registration: 20200929 Address after: Baoji City, Shaanxi Province, 721002 Dongfeng Road, Jintai District No. 2 Patentee after: Baoji Oilfield Machinery Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC national oil and gas drilling equipment Engineering Technology Research Center Co., Ltd Address before: Baoji City, Shaanxi Province, 721002 Dongfeng Road, Jintai District No. 2 Patentee before: Baoji Oilfield Machinery Co.,Ltd. |
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