CN103375150B - SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument - Google Patents
SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument Download PDFInfo
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- CN103375150B CN103375150B CN201310343944.4A CN201310343944A CN103375150B CN 103375150 B CN103375150 B CN 103375150B CN 201310343944 A CN201310343944 A CN 201310343944A CN 103375150 B CN103375150 B CN 103375150B
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Abstract
The invention discloses a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, comprise connection coupling, urceolus, lining, upper core pipe, core pipe box cupling, lower core pipe, urceolus centralizer, spring cover, sliding sleeve, spring, lining guider, wire-wrapped screen, plug and guide head.This instrument can be located by machinery easily, reduces the heavy labor of a large amount of accurate Calculation tubing string of constructor; In construction, enter under central cannula only has, fix and propose three steps, simple to operate, safe and reliable; This instrument achieves twice cut out of outer instrument filling mouth in addition, avoid construction terminate after gravel return and tell; Behind central cannula location, its filling mouth test certain depth, enter into outer packing tool intracavity bottom, this structure can make central cannula in stowing operation, even if produce tubing string play, gravel also can not enter between central cannula and outer fill tool, thus avoids the major accident that sand card tubing string occurs.
Description
Technical field
The present invention relates to field of oil drilling, particularly relate to the gravel pack tools that a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL construction operation uses.
Background technology
Horizontal well effectively can improve well yield, improve reserves exploitation rate, reduces integrated cost, is therefore used widely in the exploitation in all kinds of oil field.Current domestic water horizontal well target zone position is buried more shallow mostly, and formation cementation loosens, and easily shakes out, causes the development effectiveness of horizontal well and exploitation rate to be restricted.As time goes on sand can be caused to bury oil reservoir, sand plug oil pipe, production declining; Can cause formation collapse time serious, oil well is scrapped.
Gravel pack is again method conventional at present, in gravel-packing process in horizontal wells, need first to measure casing length, under enter outer packing tool, and then measure tubing length, under enter intubate, form sealing after putting in place, then rail is suppressed, cut off the shear pin on outer packing tool, promotion sliding sleeve is descending, exposes construction passage, completes gravel pack service.But this instrument is used for also there is following problem in SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL application: 1) during construction, need scene to measure every endowel, and need calculate in a large number, easily make mistakes; 2) fill in construction at gravel, cause tubing string play because of pressure change, make gravel enter between intubate and fill tool, form sand card tubing string, cause a serious accident; 3) after construction, the filling mouth of packing tool is not closed completely, and causes returning of gravel to tell.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of for tubing string length need not be measured, sand export energy secondary is closed and the reliable SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of construction safety.
In order to solve the problem, technical scheme of the present invention is as follows:
A kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, comprises tubing coupling and urceolus, also comprises lining, upper core pipe, core pipe box cupling, lower core pipe, urceolus centralizer, spring cover, sliding sleeve, lining guider, wire-wrapped screen and guide head.
Described urceolus upper end connects described tubing coupling, middle part along the circumferential direction outwardly formation the 1st boss, on the urceolus wall of the 1st boss bottom, along the circumferential direction be evenly equipped with multiple 1st fluid hole, urceolus bottom respectively inwardly, positioning table and marshall springs platform under outwardly formation, the outer wall of described marshall springs platform is formed the 2nd boss, urceolus is positioned on the wall on the 2nd boss and is provided with to projecting inward lining guider, urceolus lower end is positioned at the part under lower positioning table, external diameter is all less than the other parts of urceolus, the wall of this urceolus lower end is formed the 1st outage, 1st outage is closed by the wire-wrapped screen being enclosed within urceolus lower end, the lower port of urceolus is closed.In one embodiment of the invention, the lower port of described urceolus is closed by a plug.
Described upper core pipe and lower core pipe are arranged in the inner chamber of described tubing coupling and urceolus from top to bottom, connected by a core pipe box cupling between upper core pipe and lower core pipe, the middle part of described lower core pipe is formed with outage, the lower end closed of lower core pipe, forms annular gap between described urceolus lower end inner wall and lower core pipe lower end.
Described lining is arranged on described urceolus and upper, between lower core pipe, the upper end edge circumferencial direction of lining forms multiple points of claws, lining top and upper, upper annular space is formed between lower core pipe, lower annular space is formed between lining bottom and lower core pipe, in the middle part of lining, wall is formed with multiple 2nd fluid hole, the 1st fluid hole that each 2nd fluid hole is corresponding on urceolus respectively and lower annular space are communicated with, described core pipe box cupling is positioned at the bottom of described upper annular space, described outage is communicated with described lower annular space, the bottom of lining leans against on described lower positioning table, the outer wall of lining lower end is formed with the gathering sill extending to bottom vertically, lining guider on described urceolus stretches in gathering sill.
Described sliding sleeve is socketed in outside described urceolus, and sliding sleeve lower end is fixed on urceolus by multiple shear pin; The upper end of described spring cover is positioned at outside described sliding sleeve, and lower end is threaded with described marshall springs platform, is provided with spring in the space between spring cover with urceolus, and described spring overlaps top and is along the circumferential direction provided with and multiplely carries out spacing stop screw to described sliding sleeve upper end.
The upper end of described guide head is connected with the lower thread of described marshall springs platform, forms the space holding described urceolus lower end and described screen casing, the wall of guide head is formed multiple the 2nd outage be communicated with this space in this guide head.
The lower end of described lower core pipe forms the core pipe guide head that an outer peripheral face is the conical surface, be convenient to core pipe smooth under enter.
The lower end of described guide head is solid construction, and be provided with the delivery hole of multiple inclination in the internal circumference direction, lower end of guide head, the upper end open of this delivery hole is in the outer wall of guide head, and lower ending opening is in the bottom of guide head.
The circumferencial direction of described shear pin drum outer wall outside is evenly provided with multiple; Described upper and lower core Guan Yuxin pipe box cupling is threaded; Described outage is evenly equipped with multiple at the circumferencial direction of described lower core pipe.
Due in construction, pressure change can make tubing string produce upper and lower play, so the height of the annular space formed between described lining bottom and lower core pipe is more preferably greater than 500mm; Described core pipe box cupling upper end adapts to point distance of claw pawl head lower end and the height of this annular space.So that when core pipe play, liquid outlet is in annular space all the time, avoid the major accident that sand card tubing string occurs.
In addition, in order to improve sealing, between described sliding sleeve and urceolus, between the urceolus and lining of the 1st fluid hole and the 2nd fluid hole both sides and be equipped with sealing ring between the lower core pipe and lining of outage l both sides.
Gravel fill tool of the present invention, can meet tubing string in horizontal well under enter requirement, in gravel packing operations, this instrument can its own mechanical location, can determine that whether it is in place easily by hydraulic pressure, reduce the heavy labor of a large amount of accurate Calculation tubing string of constructor; In construction, enter under central cannula only has, fix and propose three steps, simple to operate, safe and reliable; This instrument achieves twice cut out of outer instrument filling mouth in addition, avoid construction terminate after gravel return and tell, improve the safety of instrument; In addition, behind central cannula location, its filling mouth test certain depth, enter into outer packing tool intracavity bottom, this structure can make central cannula in stowing operation, even if produce tubing string play, gravel also can not enter between central cannula and outer fill tool, thus avoids the major accident that sand card tubing string occurs.
Accompanying drawing explanation
Fig. 1 is the structural representation of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of the present invention;
Fig. 2 is the structural representation after SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of the present invention construction terminates;
Fig. 3 a, 3b are the structural representations of point claw in SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of the present invention;
Fig. 4 a, 4b are the structural representations of lining guider in SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
See Fig. 1-Fig. 4 b, this SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument comprises: connection coupling 1, urceolus 2, lining 3, upper core pipe 4, core pipe box cupling 5, lower core pipe 6, urceolus centralizer 7, stop screw 8, spring cover 9, sliding sleeve 10, shear pin 11, spring 12, lining guider 13, wire-wrapped screen 14, plug 15 and guide head 16.
Described connection coupling 1 has top connection and lower contact, for being threaded with tool pipe string and urceolus 2 respectively.
Described urceolus 2 has top connection and lower contact, is threaded respectively with tubing coupling 1 with plug 15.Along the circumferential direction outwardly formation the 1st boss 2a in the middle part of urceolus 2, the 1st boss 2a has external screw thread, for connecting sliding sleeve 10.The urceolus wall of the 1st boss 2a bottom is along the circumferential direction evenly equipped with and is multiplely evenly equipped with some fluid hole b, on urceolus wall under fluid hole b, exactly, be positioned on the outer drum outer wall of sliding sleeve (10) lower end, along the circumferential direction be evenly equipped with some shear pin groove k, shear pin 11 is arranged in shear pin groove k, and sliding sleeve 10 is fixed on urceolus 2 by shear pin 11.Urceolus 2 bottom is positioning table n and marshall springs platform o under inside, outwardly formation respectively, be respectively used to lining 3 insert after location, lower end and spring 12 be inserted in urceolus 2 after force side locate.The outer wall of marshall springs platform o is formed the 2nd boss 2b, and urceolus 2 is positioned on the wall on the 2nd boss and is provided with to projecting inward lining guider 13, and lining guider 13 is arranged in guide hole e.The inside and outside footpath of the part that urceolus 2 lower end is positioned under lower positioning table n is all less than the other parts of urceolus 2, and the wall of urceolus 2 lower end is formed the 1st outage g, and the 1st outage g is closed by the wire-wrapped screen 14 being enclosed within urceolus 2 lower end, and the lower port of urceolus 2 is closed.In the illustrated embodiment in which, the lower port of urceolus 2 is closed by plug 15.
Described upper core pipe 4 and lower core pipe 6 are arranged in the inner chamber of tubing coupling 1 and urceolus 2 from top to bottom, and upper core pipe 4 upper end has top connection, and for connecting working pipe string, upper core pipe 4 lower end and lower core pipe 6 are threaded by core pipe box cupling 5.The middle part of lower core pipe 6 is formed with outage l, and outage l is evenly equipped with multiple at circumferencial direction.The lower end of lower core pipe 6 is closed by a core pipe guide head i, and core pipe guide head i outer peripheral face is the conical surface, for reduction head frictional resistance fashionable under instrument.Annular gap is formed between urceolus 2 lower end inner wall and lower core pipe 6 lower end.
Described lining 3 is arranged between urceolus 2 and upper and lower core pipe 4,6, the upper end edge circumferencial direction of lining 3 forms multiple points of claw a, be convenient to insert, propose core pipe box cupling 5, that is, when upper core pipe 4, core pipe box cupling 5, lower core pipe 6 insert lining 3 or propose in lining 3, point claw a of smooth described lining 3 upper end of core pipe box cupling 5 energy; Be formed with a boss p at lining 3 inner chamber, the lower end of core pipe box cupling 5 relies on this boss p to locate.The middle part of lining 3 and lower end respectively and formed between lower core pipe 6 and seal, form upper annular space 3a, form lower annular space r between lining 3 bottom and lower core pipe 6 between lining 3 top and upper and lower core pipe 4,6.Wall in the middle part of lining 3 is formed with multiple 2nd fluid hole c, the 1st fluid hole b that each 2nd fluid hole c is corresponding on urceolus 2 respectively and lower annular space r is communicated with.Described core pipe box cupling 5 is positioned at the bottom of described upper annular space 3a, outage l is communicated with described lower annular space r, the bottom of lining 3 is positioned on lower positioning table n, the outer wall of lining 3 lower end is formed with the gathering sill f extending to bottom vertically, for point oriented sliding of claw guider 13 in guider, the lining guider 13 on urceolus 2 stretches in gathering sill f.
Described sliding sleeve 10 is arranged on outside urceolus 2, is formed to seal, formed between urceolus 2 wall under lower end and the 2nd fluid hole c and seal between the upper end inwall of sliding sleeve 10 and the 1st boss 2a, and sliding sleeve 10 lower end is fixed on urceolus 2 by multiple shear pin 11.
Sliding sleeve 10 upper end can form enough pressure reduction, to cut off shear pin 11 by the size of multiple 1st, the 2nd fluid hole Special composition d, space d in construction.
The upper end of described spring cover 9 is positioned at outside described sliding sleeve 10, and lower end is threaded with described marshall springs platform o, is provided with spring 12 in the space between spring cover 9 and urceolus 2.Spring overlaps 9 tops and is provided with and marks closely shear pin hole, in-builtly marks closely screw 7, and spring cover 9 is fixed with outer sleeve centralizer 7 by marking closely screw 7, and outer sleeve centralizer 7 is for making urceolus 2 position after entering well placed in the middle.
The upper end of described guide head 16 is connected with the lower thread of marshall springs platform o on urceolus 2, the space holding urceolus 2 lower end and screen casing 14 is formed in guide head 16, the wall of guide head 16 is formed with multiple the 2nd outage h be communicated with this space, for equilibrium pressure fashionable under core pipe.The lower end of guide head 16 is solid construction, is evenly equipped with the delivery hole m of multiple inclination, for discharge opeing fashionable under outer packing tool in inside, the lower end of guide head 16.The upper end open of delivery hole m is in the outer wall of guide head 16, and lower ending opening is in the bottom of guide head 16.
In addition, in order to improve sealing, between sliding sleeve 10 and urceolus 2, between the urceolus 2 and lining 3 of liquid outlet b and liquid outlet c both sides and be equipped with sealing ring between the lower core pipe 6 and lining 3 of outage l both sides.
Below the using method of gravel pack tools of the present invention is described.
See Fig. 1 and Fig. 2, in this packing tool, connection coupling 1, urceolus 2, lining 3, urceolus centralizer 7, stop screw 8, spring cover 9, sliding sleeve 10, shear pin 11, spring 12, lining guider 13, wire-wrapped screen 14, plug 15 and guide head 16 form outer packing tool; Upper core pipe 4, core pipe box cupling 5, lower core pipe 6 form central cannula.
During use, first by outer packing tool with at the bottom of completion tubular column lower going-into-well, then enter under the central cannula being arranged on interior service tube-column front end.Arrive spacing after, liquid small displacement is pumped into, utilizes low pressure authentication center intubate whether to enter outer packing tool inner chamber, if well head does not have liquid to return out, just prove that central cannula has entered in outer packing tool chamber, now, the 1st fluid hole b and the 2nd fluid hole c position just right.
Continue pumping liquid, when pressure in central cannula exceeds the break limit of shear pin 11, uniform multiple shear pins 11 are all cut off, under differential pressure action, sliding sleeve 10 is descending, and spring 12 is compressed simultaneously, and the 1st, the 2nd fluid hole b, c is opened, the liquid carrying gravel enters in the annular space between sleeve pipe and urceolus through the 1st, the 2nd fluid hole and the gap between spring cover 9 and urceolus 2, starts gravel and fills.
After gravel pack terminates, the pressure between central cannula and outer packing tool reaches balance, and sliding sleeve 10 automatically closes the 1st, the 2nd fluid hole b, c under the effect of spring 12.Due to the position-limiting action of stop screw 8, sliding sleeve 10 excessively can not be ejected by spring 12.On carry interior service tube-column and central cannula, core pipe box cupling 5 thereupon by carry and drive lining 3 upper end to divide claw a up, liquid outlet c is simultaneously up, and the secondary realizing filling mouth is closed, as shown in Figure 2.On put forward interior service tube-column to certain altitude, when such as, carrying 2m on, in fixing, service tube-column carries out backwash.After backwash terminates, interior service tube-column and central cannula are together proposed ground, complete reverse shunting filling construction.
After instrument enters well, the position of outage l in lower annular space r mobilizable distance more preferably greater than 500mm, correspondingly, core pipe box cupling 5 upper end is also greater than 500mm to the distance of point claw a pawl head lower end, like this, in construction, when pressure change makes tubing string produce upper and lower play, can ensure that outage l is in annular space all the time, thus can avoid in construction because pressure changes the sand card tubing string problem producing tubing string play and cause.
Claims (10)
1. a SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, comprise tubing coupling and urceolus, it is characterized in that: also comprise lining (3), upper core pipe (4), core pipe box cupling (5), lower core pipe (6), urceolus centralizer (7), spring cover (9), sliding sleeve (10), lining guider (13), wire-wrapped screen (14) and guide head (16)
Described urceolus (2) upper end connects described tubing coupling (1), middle part along the circumferential direction outwardly formation the 1st boss (2a), on the urceolus wall of the 1st boss (2a) bottom, along the circumferential direction be evenly equipped with multiple 1st fluid hole (b), urceolus (2) bottom respectively inwardly, positioning table (n) and marshall springs platform (o) under outwardly formation, the outer wall of described marshall springs platform (o) is formed the 2nd boss (2b), urceolus (2) is positioned on the wall on the 2nd boss and is provided with to projecting inward lining guider (13), urceolus (2) lower end is positioned at the part under lower positioning table (n), external diameter is all less than the other parts of urceolus (2), the wall of this urceolus (2) lower end is formed the 1st outage (g), 1st outage (g) is closed by the wire-wrapped screen (14) being enclosed within urceolus (2) lower end, the lower port of urceolus (2) is closed,
Described upper core pipe (4) and lower core pipe (6) are arranged in the inner chamber of described tubing coupling (1) and urceolus (2) from top to bottom, connected by a core pipe box cupling (5) between upper core pipe (4) and lower core pipe (6), the middle part of described lower core pipe (6) is formed with outage (l), the lower end closed of lower core pipe (6), forms annular gap between described urceolus (2) lower end inner wall and lower core pipe lower end;
Described lining (3) is arranged on described urceolus (2) and upper, lower core pipe (4, 6) between, the upper end edge circumferencial direction of lining (3) forms multiple points of claws (a), lining (3) top and upper, lower core pipe (4, 6) upper annular space (3a) is formed between, lower annular space (r) is formed between lining (3) bottom and lower core pipe (6), lining (3) middle part wall is formed with multiple 2nd fluid hole (c), each 2nd fluid hole (c) respectively corresponding 1st fluid hole (b) upper with urceolus (2) is communicated with lower annular space (r), described core pipe box cupling (5) is positioned at the bottom of described upper annular space (3a), described outage (l) is communicated with described lower annular space (r), the bottom of lining (3) is positioned on described lower positioning table (n), the outer wall of lining (3) lower end is formed with the gathering sill (f) extending to bottom vertically, lining guider (13) on described urceolus (2) stretches in gathering sill (f),
Described sliding sleeve (10) is socketed in described urceolus (2) outside, and sliding sleeve (10) lower end is fixed on urceolus (2) by multiple shear pin (11);
The upper end of described spring cover (9) is positioned at described sliding sleeve (10) outside, lower end is threaded with described marshall springs platform (o), be provided with spring (12) in space between spring cover (9) and urceolus (2), described spring cover (9) top is along the circumferential direction provided with multiplely carries out spacing stop screw (8) to described sliding sleeve (10) upper end;
The upper end of described guide head (16) is connected with the lower thread of described marshall springs platform (o), in this guide head (16), form the space holding described urceolus (2) lower end and described screen casing (14), the wall of guide head (16) is formed multiple the 2nd outage (h) be communicated with this space.
2. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: the lower port of described urceolus (2) is closed by a plug (15).
3. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: the lower end of described lower core pipe (6) formed an outer peripheral face be the core pipe guide head of the conical surface (i).
4. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: described lining guider (13) is arranged in the upper guide hole (e) formed of urceolus (2).
5. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, it is characterized in that: the lower end of described guide head (16) is solid construction, the delivery hole (m) of multiple inclination is provided with at the circumferencial direction of the inside, lower end of guide head (16), the upper end open of this delivery hole (m) is in the outer wall of guide head (16), and lower ending opening is in the bottom of guide head (16).
6. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: the circumferencial direction of described shear pin (11) drum outer wall outside is evenly provided with multiple.
7. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: described upper and lower core pipe (4,6) is threaded with core pipe box cupling (5).
8. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: described outage (l) is evenly equipped with multiple at the circumferencial direction of described lower core pipe (6).
9. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: the height of the annular space (r) formed between described lining (3) bottom and lower core pipe (6) is greater than 500mm; Described core pipe box cupling (5) upper end adapts to the distance of described point of claw (a) pawl head lower end and the height of this annular space (r).
10. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument according to claim 1, is characterized in that: between described sliding sleeve (10) and urceolus (2), be positioned between the urceolus (2) of liquid outlet (b) and liquid outlet (c) both sides and lining (3) and be positioned between the lower core pipe (6) of outage (l) both sides and lining (3) and be equipped with sealing ring.
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| CN201310343944.4A CN103375150B (en) | 2013-08-08 | 2013-08-08 | SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument |
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| CN201310343944.4A CN103375150B (en) | 2013-08-08 | 2013-08-08 | SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106837243A (en) * | 2015-12-03 | 2017-06-13 | 中国石油化工股份有限公司 | A kind of tubular column unit |
| CN108716388B (en) * | 2018-08-17 | 2024-05-14 | 东营市瑞丰石油技术发展有限责任公司 | Seal assembly for gravel packing tool |
| CN110685648A (en) * | 2019-11-01 | 2020-01-14 | 东营市瑞丰石油技术发展有限责任公司 | Filling tool and well completion string |
| CN113638712B (en) * | 2021-08-30 | 2024-05-28 | 阜宁县宏达石化机械有限公司 | Reverse gravel throwing device |
| CN117888863B (en) * | 2024-03-15 | 2024-05-17 | 东营市华科石油科技开发有限责任公司 | Gravel packing layered sand control completion tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4856591A (en) * | 1988-03-23 | 1989-08-15 | Baker Hughes Incorporated | Method and apparatus for completing a non-vertical portion of a subterranean well bore |
| CN2895733Y (en) * | 2006-03-16 | 2007-05-02 | 周隽 | Extrusion gravel-packing sand-proof tool |
| CN202064909U (en) * | 2010-10-17 | 2011-12-07 | 吴志强 | Primary squeeze circular gravel packing tool of sand clamp prevention immobile tubing string |
| CN202560183U (en) * | 2012-05-21 | 2012-11-28 | 中国石油天然气股份有限公司 | Gravel filling tool for horizontal wells |
| CN202914051U (en) * | 2012-10-09 | 2013-05-01 | 中国石油天然气股份有限公司 | Gravel filling device |
| CN203430490U (en) * | 2013-08-08 | 2014-02-12 | 中国石油集团渤海钻探工程有限公司 | Horizontal well gravel filling tool |
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Effective date of registration: 20210712 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 Huanghai Road 106, Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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