CN205955680U - Continuous circulating device of gas drilling - Google Patents

Continuous circulating device of gas drilling Download PDF

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Publication number
CN205955680U
CN205955680U CN201620999115.0U CN201620999115U CN205955680U CN 205955680 U CN205955680 U CN 205955680U CN 201620999115 U CN201620999115 U CN 201620999115U CN 205955680 U CN205955680 U CN 205955680U
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China
Prior art keywords
drilling
support
control head
continuous circulating
gas
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CN201620999115.0U
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Chinese (zh)
Inventor
马金山
齐金涛
徐朝阳
郗凤亮
徐海潮
魏臣兴
胡志坚
肖建秋
梁国红
郭云鹏
苏尚文
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China National Petroleum Corp
CNPC Bohai Drilling Engineering Co Ltd
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CNPC Bohai Drilling Engineering Co Ltd
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Priority to CN201620999115.0U priority Critical patent/CN205955680U/en
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Abstract

The utility model discloses a continuous circulating device of gas drilling, it is installed and under the rig floor face of rig to on being fixed in well drilling blowout preventer stack, being applicable to carousel rig and top and driving the rig, not only occupy the space of rig floor face, the single operating efficiency with the stand of just unloading is high, this continuous circulating device of gas drilling includes drill pipe tong assembly, power cylinder group, support, rotating control head and four ram -type preventer that top -down set gradually, the device mutually supports between through each part and can realize the gas drilling and unload single or stand in -process and keep the continuous cycle in the pit shaft, has avoided taking place because of the down -hole troublesome condition in the pit that gas circulation suspends arousing, reduces the non - brill time.

Description

The continuous circulating device of gas drilling
Technical field
This utility model is related to drilling equipment technical field, particularly to a kind of continuous circulating device of gas drilling.
Background technology
Air drilling can be greatly improved rate of penetration, shortens drilling period, reduces drilling cost.At present, conventional Gas drilling operation, make up a joint, unload single and connect column, unload column before it is necessary to stop gas injection pressure release, treat that operation completes it Afterwards, more again gas injection recovers the circulation in pit shaft.During stopping gas injection, landwaste sinks, and for straight well, is then easily deposited on drilling tool Around, cause bit freezing;For high angle hole, horizontal well, then easily it is deposited on borehole bottom and forms cutting bed, cause bit freezing.Meanwhile, Formation water output is collected at annular space and forms continuous water column, it is necessary to gas injection draining before normal circulation in well is set up in gas injection again, thus Cause gas injection pressure too high.If having water in long-time pit shaft, easily causing the borehole wall unstable, causing down hole problem and accident.
Continuous cyclic drilling technology can make gas drilling drill string shackle, keep continuous in pit shaft during upper button and circulate, Avoid, because of the down hole problem caused by well interior circulation terminal, reducing handling process, for gas drilling in bad ground Drilling safety plays a key effect.
In for example disclosed patent CN101942977B of existing continuous circulating device, its main frame is arranged on the drilling floor surface of rig On, other operations on drilling floor surface for the impact, it is subject to top to drive the distance limit between bottom to circulating device top simultaneously, be only used for Connect, unload single it is impossible to connect, unload column (thribble), less efficient.Flashboard is adopted to form seal cavity completely, upper half envelope flashboard is close Adhesive body is directly worn and torn by drilling rod rotation, and seal durability is low.
Utility model content
The purpose of this utility model is to provide one kind not affect other rig corollary apparatus of more than drilling floor surface and be not subject to itself Top, to the limitation in height of rig floor, and keeps the gas in pit shaft continuously to circulate during the single or column of unloading, it is to avoid The continuous circulating device of gas drilling occurring because of the down-hole complicated state caused by cycle interruption.
For this reason, technical solutions of the utility model are as follows:
A kind of continuous circulating device of gas drilling, including the drill pipe tong assembly setting gradually from top to bottom, power oil Cylinder group, support, swivel control head and four ram preventers;Wherein:
Described drill pipe tong assembly includes Power Tong and the driving means for described Power Tong;Described Power Tong is fixed It is being arranged on the base plate below drill pipe tong assembly;
Described support is arranged on below described base plate, and is separated with described base plate by four pieces of uniform damping, buffering blocks; Described support is provided with a hollow cavity;
Described swivel control head arranges and is fixed on described rack bore;Described swivel control head includes bearing assembly, sets Put the cone packing unit in described bearing assembly bottom and be enclosed in described bearing assembly and described cone fluid sealant Spin Control casing outside core, described Spin Control casing side side wall is provided with the upper bypass pipe being in communication with the outside Road;
Described actuator cylinder group arranges and is fixed in described support;Described actuator cylinder group is included along described rotation control The uniform multiple oil cylinders of head circumferencial direction processed;
What described four ram preventers included setting gradually from top to bottom blind rams preventer, back-up tong, load-bearing flashboard With half envelope ram preventer;It is provided with side wall between described load-bearing flashboard and described half envelope ram preventer and be in communication with the outside Lower bypass line;
Bypass valve and lower bypass valve are respectively arranged with upper bypass line and lower bypass line;
Equal at described drill pipe tong assembly, described base plate, described swivel control head and described four ram preventer centers Offer the axially extending bore for plug-in mounting drilling rod, and the axis of the axially extending bore of each part overlaps;Axially extending bore internal diameter and brill The external diameter of bar is adapted.
Further, described support surrounds a framework knot with inner chamber by upper backup pad, four root posts and lower supporting plate Structure;The center of described upper backup pad and lower supporting plate all offers centre bore.
Further, described actuator cylinder group includes four oil cylinders, four cylinder block difference along the circumferential direction uniform cloth Around described swivel control head, and top is fixed on the upper backup pad of described support, four in-oil cylinder four piston rods The corresponding through hole in four positions being then passed through opening up on upper backup pad is fixed on base plate.
Further, on the downside of the Spin Control casing of described swivel control head include extend axially downward to described Vertical part and the transverse part radially extending to both sides from vertical part bottom that support ground flushes;Described cradle bottom surface is press-fitted and is fixed on On the upper surface of described transverse part, the described bearing assembly of described swivel control head and described cone packing unit is made to be fixed on institute State at the chamber central of support;Described four ram preventers are arranged on below described support and are fixed on the lower surface of described transverse part On.
Further, four pieces of damping, buffering blocks be fixed on the upper end end face of described support and arrange with piston rod inside; Described damping, buffering block is the compound cushion of rubber-metal.
Further, described upper bypass valve and described lower bypass valve are all from the valve that surges.
Further, described swivel control head is low pressure swivel control head.
Further, it is connected with drilling well threeway and wellhead blowout preventor group in turn below described four ram preventers;Described brill Well threeway is consistent with the axially extending bore internal diameter of described four ram preventers with described wellhead blowout preventor group central through hole.
Compared with prior art, the continuous circulating device of this gas drilling utilizes this practicality new in gas drilling operation process The device of type makes gas drilling unload during single or column to keep the continuous circulation in pit shaft, it is to avoid because in gas circulation Disconnected caused down hole problem occurs, and reduces the non-brill time.Seal on swivel control head and blind rams preventer composition Cavity, unloads during the single or column of button, the bearing assembly of swivel control head can rotate with drilling rod, and sealing part abrasion is little; In addition, the continuous circulating device of gas drilling of the present utility model is installed under the drilling floor surface of rig, device is fixed on drilling well to be prevented On spray apparatus group, rotary disk driller and top drive drilling are all applicable, prevent take up the space of drilling floor surface, single and column of can unloading, and make Industry efficiency high.
Brief description
Fig. 1 is the structural representation of the continuous circulating device of gas drilling of the present utility model;
Fig. 2 is structural representation normally under drilling state for the continuous circulating device of gas drilling of the present utility model;
Fig. 3 is the structural representation that the continuous circulating device of gas drilling of the present utility model starts when dismantling;
Fig. 4 is the structural representation that the continuous circulating device of gas drilling of the present utility model starts during upper button.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further to this utility model, but following embodiment is right absolutely not This utility model has any restriction.
The continuous circulating device of this gas drilling is applied to for loading and unloading single or column, and it is arranged under the rig floor 13 of rig Portion, makes other rig corollary apparatus of more than drilling floor surface unaffected, is not also subject to itself top to the limitation in height of rig floor simultaneously.
As shown in figure 1, this is used for loading and unloading the continuous circulating device of single or column gas drilling, total including drill pipe tong Become 1, actuator cylinder group 4, support 3, swivel control head 5, upper bypass valve 6, four ram preventers 7 and lower bypass valve 8;Wherein:
Described drill pipe tong assembly 1 includes Power Tong 101 and the driving means for described Power Tong 101;Described dynamic Power pincers 101 have clamping drilling rod function and provide moment of torsion for shackle on drilling rod;
On the base plate 2 that described Power Tong 101 fixation is arranged thereunder, described support 3 is arranged on below described base plate 2 simultaneously Separated by four pieces of uniform damping, buffering blocks 14;
Described support 3 surrounds a framework knot with inner chamber by upper backup pad 301, four root posts 302 and lower supporting plate 303 Structure;The center of described upper backup pad 301 and lower supporting plate 303 all offers centre bore;
Described swivel control head 5 is arranged at described support 3 inner chamber;Specifically, described swivel control head 5 includes bearing assembly 501st, it is arranged on the cone packing unit 502 of described bearing assembly 501 bottom and be enclosed in described bearing assembly 501 and institute State the Spin Control casing 503 in cone packing unit 502 outside, described Spin Control casing 503 side side wall sets It is equipped with the upper bypass line being in communication with the outside;
Described actuator cylinder group 4 is arranged in described support 3;Described actuator cylinder group 4 includes four oil cylinders, four oil cylinders Cylinder body respectively along the circumferential direction uniformly cloth around described swivel control head 5, and top is fixed on the upper backup pad of described support 3 On 301, the corresponding through hole in four positions that four in-oil cylinder four piston rods are then passed through open up on upper backup pad 301 is fixed On a base plate 2, for supporting and driving described base plate 2 to move up and down;
Spin Control casing 503 downside of described swivel control head 5 include extending axially downward to described support 3 Vertical part and the transverse part radially extending to both sides from vertical part bottom that ground flushes;Described support 3 bottom surface is press-fitted and is fixed on institute State on the upper surface of transverse part, make the described bearing assembly 501 of described swivel control head 5 and described cone packing unit 502 solid It is scheduled on described support 3 center position;Described four ram preventers 7 are arranged on described support 3 lower section and are fixed on described transverse part Lower surface on;
What described four ram preventers 7 included setting gradually from top to bottom blind rams preventer 701, back-up tong 702, hold Weight flashboard 703 and half envelope ram preventer 704;Side wall between described load-bearing flashboard 703 and described half envelope ram preventer 704 On be provided with the lower bypass line being in communication with the outside;
Wherein, envelope ram preventer 701 and half envelope ram preventer 704 are differently formed following two by controlling open and-shut mode The state of kind:I () closes when described half envelope ram preventer 704, when blind rams preventer 701 is opened, swivel control head 5 and half Form total airtight cavity between envelope ram preventer 704;(ii) when half envelope ram preventer 704 is closed, blind rams preventer During 701 closing, between swivel control head 5 and blind rams preventer 701, form upper airtight cavity 15, now described upper annular seal space Body 15 and described upper bypass orifice;Airtight under being formed between blind rams preventer 701 and half envelope ram preventer 704 Cavity 16, described lower airtight cavity 16 and described lower bypass orifice;Described back-up tong 702 is used for providing shackle on drilling rod anti-twisted Square, on back-up tong direct holding drill pipe female joint outer wall during upper shackle;Described load-bearing flashboard 703 is used for bearing drilling rod weight;
Described upper bypass valve 6 and described lower bypass valve 8 are separately positioned on bypass line and lower bypass line, control respectively The open and-shut mode on bypass connecting pipe road and lower bypass connecting pipe road in system;Described upper bypass valve 6 and described lower bypass valve 8 are all selected Surge valve;
Described drill pipe tong assembly 1, described base plate 2, described swivel control head 5 and described four ram preventer 7 center It is provided with the axially extending bore for plug-in mounting drilling rod 10, and the axis of the axially extending bore of each part overlaps;Axially extending bore internal diameter It is adapted with the external diameter of drilling rod 10;
Wherein, four pieces of damping, buffering blocks 14 be fixed on the upper end end face of described support 3 and arrange with piston rod inside;Subtract Shake buffer stopper 14 is the compound cushion of rubber-metal;Described swivel control head selects low pressure swivel control head, to gas distribution Or while suppression, the bearing assembly of described swivel control head and glue core rotate with drilling rod, reduce sealing part abrasion.
When the continuous circulating device of this gas drilling is arranged on rig floor 13 bottom, the lower surface of described four ram preventers 7 is solid Surely be connected with drilling well threeway 9 and the lower surface of described four ram preventers 7 and the ring flange upper surface of described drilling well threeway 9 on connect Connect;Described drilling well threeway 9 lower end is fixed with wellhead blowout preventor group 11;Described drilling well threeway 9 and described wellhead blowout preventor group 11 shape The isometrical centre bore of four ram preventer 7 described in Cheng Youyu;
Described drilling well threeway 9 top and bottom respectively with described four ram preventers 7 of top and the blowout preventer of lower section Device group 11 forms connection, remaining third connecting mouth and pipeline and connects and composes the 3rd bypass line 12;So, this gas drilling connects Continuous circulating device defines two gas peripheral passages, respectively:The 3rd bypass pipe on described drilling rod and described drilling well threeway Road 12 constitutes gas peripheral passage one, the 3rd bypass line in described lower bypass passageways and described drilling rod and described drilling well threeway 12 composition gas peripheral passages two.
The operation principle of the continuous circulating device of this gas drilling is as follows:
When drilling rod normally creeps into, the gas peripheral passage one of the continuous circulating device of this gas drilling is opened, and bypass is in pass Closed state, makes drilling rod 10 and the 3rd bypass line 12 form circulation canal;Specifically, drilling rod 10 passes through Power Tong assembly 1, base plate 102nd, support 3, swivel control head 5, four ram preventers 7, drilling well threeway 9 and wellhead blowout preventor group 11, enters well;Power Tong 101st, blind rams preventer 701, back-up tong 8, load-bearing flashboard 9 and half envelope ram preventer 11 are in opening, upper bypass Valve 6 and lower bypass valve 8 are closed, and form sealing, gas between the glue core 502 of swivel control head 5 and drilling rod 10 outer wall It is injected into shaft bottom from drilling rod 10 upper end, return out the 3rd bypass line 12 again through drilling well threeway 9 for the mineshaft annulus from drill bit Flow out, realize gas drilling work cycle;When unloading single or column, Power Tong clamping drilling rod simultaneously provides for upper shackle and turns Square, back-up tong provides the reaction torque of shackle on drilling rod, and load-bearing flashboard 703 bears drilling rod weight, and actuator cylinder group 4 lead-screw lifts Drill pipe tong assembly makes tool joint precise positioning, closes half and seals ram preventer 704 and blind rams preventer 701, Form upper airtight cavity, in blind rams preventer 7 and half envelope flashboard between swivel control head 5 and blind rams preventer 701 Form lower airtight cavity between preventer 704, gas circulation bypass switched to gas peripheral passage two by continuous circulating device, Make lower bypass line form circulation canal with drilling rod and the 3rd bypass line 12, realize mine gas and continuously circulate, it is to avoid due to The many unfavorable complex situations in down-hole that gas stops circulation and causes occur, thus realizing stable working as during whole drilling Amount circulating density and incessantly discharge drilling cuttings.
Below by way of respectively to normally creeping into, make up a joint or the operation implementation process of column is further elaborated, It is beneficial to apparent understanding operation principle of the present utility model.
1 normal drilling process:As shown in Fig. 2 Power Tong 101, blind rams 701, back-up tong 702, load-bearing flashboard 703, half Envelope flashboard 704 opening, upper bypass valve 6 and lower bypass valve 8 are closed, and drilling rod 10 passes through drill pipe tong assembly 1, base plate 2, props up Frame 3, swivel control head 5, four ram preventers 7, drilling well threeway 9 and wellhead blowout preventor group 11, enter in well;Swivel control head 5 cone packing unit 502 sealing drilling rod 10 outer wall;Gas injects from drilling rod 10 top, from the 3rd bypass of drilling well threeway 9 Pipeline 12 pipeline flows out, and gas peripheral passage one circular flow is realized gas drilling operation and normally crept into.
2 drill rod fastener dismount processes:As shown in figure 3, above carrying drill string first, when tool joint goes out rig floor 13, stopping carries brill Post, closes load-bearing flashboard 703, then transfers drill string, tool joint is seated on load-bearing flashboard 703, stops decentralization drill string;Close half Envelope flashboard 704, the glue core 502 of half envelope flashboard 704 and swivel control head 5 forms total seal cavity;Lower bypass line is pressurized to and sets When determining casing pressure value, open lower bypass valve 8, continue supercharging, make total cavity internal pressure rise to the vertical pressure value of setting, make total seal cavity Interior pressure and pressure balance in drilling rod 10;Close back-up tong 702, back-up tong steps up tool joint;Close Power Tong 101, power clamp Tight top rod body, starts Power Tong 101 and dismantles tool joint, actuator cylinder group 4 promotes base plate 2, makes top rod public access Head rises on blind rams 701, stops actuator cylinder group 4;Close blind rams 701, blind rams 701 and swivel control head 5 cone packing unit 502 forms upper seal cavity, and blind rams 701 and half envelope flashboard 704 form lower seal cavity;Under In seal cavity, continue to inject gas from lower bypass valve 8, gas enters from the female joint of bottom drilling rod, from the of drilling well threeway 9 Three bypass lines 12 return out, gas peripheral passage two circular flow;Bypass valve 6 pressure release in unlatching, upper annular seal space and top rod When interior pressure is down to atmospheric pressure;Turn on the power pincers 101, and Power Tong 101 unclamps top rod, and actuator cylinder group 4 resets, and proposes Top rod, completes shackle process, can carry out detaining operation in next step.
Journey is snapped through on 3 drilling rods:As shown in figure 4, continuous circular flow is continued in gas peripheral passage two, first, drilling rod passes through dynamic Power clamps the upper backup pad 301 of assembly 1 and support 3, and lowering drill pipes pass through the cone packing unit 502 of swivel control head 5, drilling rod Male joint is located between blind rams 701 and the cone packing unit 502 of swivel control head 5;Start actuator cylinder group 4 to promote Base plate 2 rises, and closes Power Tong 101, and Power Tong 101 clamps the body of top rod;Buttoned-up blind rams 701 and rotation The cone packing unit 502 of control 5 forms upper seal cavity, buttoned-up blind rams 701 and buttoned-up half envelope lock Plate 704 forms lower seal cavity;Bypass valve 6 is closed in pass, injects gas by top rod, so that seal cavity is pressurized;When upper When seal cavity pressure and lower seal cavity pressure balance, open blind rams 701;Start Power Tong 101, drive top rod Rotate, actuator cylinder group 4 drives drilling rod decentralization simultaneously, makes the joint of upper and lower drilling rod complete to pull work;Close lower bypass valve 8, Gas injects into well from drilling rod, returns out from the 3rd bypass line 12 of drilling well threeway 9, switching gas peripheral passage one circulating OK;Stop Power Tong 101 to rotate, open Power Tong 101, make Power Tong 101 unclamp top rod body, actuator cylinder group 4 is multiple Position;Open back-up tong 702 and load-bearing flashboard 703, back-up tong 702 and load-bearing flashboard 703 unclamp tool joint and reset;Open bypass Valve 6, makes total seal cavity pressure release, when the pressure in total seal cavity is balanced with well head pressure, closes and closes bypass valve 6, open Half envelope flashboard 704, former total seal cavity is connected with mineshaft annulus, and half envelope flashboard 704 resets;Complete to snap through journey, can carry out Normal drilling.
Wherein, above, in shackle process, drilling rod is to stop brill state.

Claims (8)

1. a kind of continuous circulating device of gas drilling is it is characterised in that the drill pipe tong including setting gradually from top to bottom is total Become (1), actuator cylinder group (4), support (3), swivel control head (5) and four ram preventers (7);Wherein, described drilling rod power Pincers assembly (1) include Power Tong (101) and the driving means for described Power Tong (101);Described Power Tong (101) is fixed on It is arranged on the base plate (2) below drill pipe tong assembly (1);Described support (3) is arranged on below described base plate (2), and leads to Cross four pieces of uniform damping, buffering blocks (14) to separate with described base plate (2);Described support (3) is provided with a hollow cavity;Described rotation Turn and control head (5) to arrange and be fixed on described support (3) inner chamber;Described swivel control head (5) includes bearing assembly (501), sets Put the cone packing unit (502) in described bearing assembly (501) bottom and be enclosed in described bearing assembly (501) and institute State the Spin Control casing (503) outside cone packing unit (502), described Spin Control casing (503) side side The upper bypass line being in communication with the outside is provided with wall;Described actuator cylinder group (4) arranges and is fixed in described support (3) Interior;Described actuator cylinder group (4) is included along the uniform multiple oil cylinders of described swivel control head (5) circumferencial direction;Described four flashboards Preventer (7) include set gradually from top to bottom blind rams preventer (701), back-up tong (702), load-bearing flashboard (703) With half envelope ram preventer (704);On side wall between described load-bearing flashboard (703) and described half envelope ram preventer (704) It is provided with the lower bypass line being in communication with the outside;Upper bypass line and lower bypass line are respectively arranged with bypass valve (6) With lower bypass valve (8);In described drill pipe tong assembly (1), described base plate (2), described swivel control head (5) and described four locks Plate preventer (7) center all offers the axially extending bore for plug-in mounting drilling rod (10), and the axis of the axially extending bore of each part Overlap;Axially extending bore internal diameter is adapted with the external diameter of drilling rod (10).
2. the continuous circulating device of gas drilling according to claim 1 is it is characterised in that described support (3) is by upper support Plate (301), four root posts (302) and lower supporting plate (303) surround a frame structure with inner chamber;Described upper backup pad And the center of lower supporting plate (303) all offers centre bore (301).
3. the continuous circulating device of gas drilling according to claim 2 is it is characterised in that described actuator cylinder group (4) bag Include four oil cylinders, four cylinder blocks respectively along the circumferential direction uniformly cloth around described swivel control head (5), and top is fixed On the upper backup pad (301) of described support (3), four in-oil cylinder four piston rods are then passed through on upper backup pad (301) The corresponding through hole in four positions opening up is fixed on base plate (2).
4. the continuous circulating device of gas drilling according to claim 2 is it is characterised in that described swivel control head (5) Include on the downside of Spin Control casing (503) extending axially downward to the vertical part flushing with described support (3) ground and certainly erecting The transverse part that portion bottom radially extends to both sides;Described support (3) bottom surface is press-fitted and is fixed on the upper surface of described transverse part, makes The described bearing assembly (501) of described swivel control head (5) and described cone packing unit (502) are fixed on described support (3) at chamber central;Described four ram preventers (7) are arranged on below described support (3) and are fixed under described transverse part On end face.
5. the continuous circulating device of gas drilling according to claim 3 is it is characterised in that four pieces of damping, buffering blocks (14) are solid Be scheduled on the upper end end face of described support (3) and arrange with piston rod inside;Described damping, buffering block (14) is multiple for rubber-metal Mould assembly cushion.
6. the continuous circulating device of gas drilling according to claim 1 is it is characterised in that described upper bypass valve (6) and institute State lower bypass valve (8) all from the valve that surges.
7. the continuous circulating device of gas drilling according to claim 1 is it is characterised in that described swivel control head (5) is Low pressure swivel control head.
8. the continuous circulating device of gas drilling according to claim 1 is it is characterised in that described four ram preventers (7) Lower section is connected with drilling well threeway (9) and wellhead blowout preventor group (11) in turn;Described drilling well threeway (9) and described wellhead blowout preventor group (11) central through hole is consistent with the axially extending bore internal diameter of described four ram preventers (7).
CN201620999115.0U 2016-08-30 2016-08-30 Continuous circulating device of gas drilling Active CN205955680U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106223884A (en) * 2016-08-30 2016-12-14 中国石油集团渤海钻探工程有限公司 The continuous circulating device of gas drilling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106223884A (en) * 2016-08-30 2016-12-14 中国石油集团渤海钻探工程有限公司 The continuous circulating device of gas drilling

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Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20210916

Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen

Patentee after: CHINA NATIONAL PETROLEUM Corp.

Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd.

Address before: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd.

Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd.