CN202560183U - Gravel filling tool for horizontal wells - Google Patents

Gravel filling tool for horizontal wells Download PDF

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Publication number
CN202560183U
CN202560183U CN2012202302021U CN201220230202U CN202560183U CN 202560183 U CN202560183 U CN 202560183U CN 2012202302021 U CN2012202302021 U CN 2012202302021U CN 201220230202 U CN201220230202 U CN 201220230202U CN 202560183 U CN202560183 U CN 202560183U
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CN
China
Prior art keywords
core
sliding sleeve
horizontal well
gravel packing
simulation study
Prior art date
Application number
CN2012202302021U
Other languages
Chinese (zh)
Inventor
孙厚利
张建军
吕民
陈大钊
陈磊
丛志新
宗伟
赵雅丽
张鑫
李学良
张军
于俊梅
杨晓莉
Original Assignee
中国石油天然气股份有限公司
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Application filed by 中国石油天然气股份有限公司 filed Critical 中国石油天然气股份有限公司
Priority to CN2012202302021U priority Critical patent/CN202560183U/en
Application granted granted Critical
Publication of CN202560183U publication Critical patent/CN202560183U/en

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Abstract

The utility model provides a gravel filling tool for horizontal wells, which comprises an inner cylinder and an outer cylinder, wherein the inner cylinder and the outer cylinder are sequentially sleeved from the inside to the outside; an inner filling hole and an outer filling hole communicated with each other are correspondingly formed in the side wall of the inner cylinder and in the side wall of the outer cylinder; at least one sandwich wall slot which is through in the axial direction is formed in the outer surface of the inner cylinder; one end of the sandwich wall slot is communicated with one end of an inner cavity at one end of the outer cylinder; the other end of the outer cylinder is connected with a plug through an external thread; the sandwich wall slot is not communicated with the inner filling hole; a movable slide bushing is embedded in the inner cylinder; the slide bushing closes the inner filling hole correspondingly, one end of the slide bushing is positioned at a limit protruding part in the inner cylinder, and the other end of the slide bushing protrudes out of the inner cylinder and pushes against a first spring accommodated in the plug; a back-flushing hole is formed in the side wall of the slide bushing close to the other end; the back-flushing hole is communicated with the other end of the sandwich wall slot; and a current guiding device that can be used for closing the inner cavity of the slide bushing is arranged in the slide bushing. The gravel filling tool for horizontal wells is simple in structure and reliable in working and is matched with a sand-proof column used in gravel filling for horizontal wells, so as to achieve the integration of filling and back-flushing.

Description

The SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument

Technical field

The utility model relates to a kind of gravel pack back-up sand instrument, especially a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument.

Background technology

The SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control is a kind of at the outside pack gravel of screen casing; Utilize the sand bridge at gravel and reservoir sand interface to carry out the oil mining supporting technology of sand control; Be applicable to the horizontal well of barefoot completion and screen jacket pipe completion; This technology is combined with packing tool by the SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe usually, and horizontal well is carried out gravel pack back-up sand work.Packing tool mainly is divided into two types at present:

One type is the back-up sand packer, and this kind tool has functions such as packing screen jacket annular space, suspended screen tubing string, back-up sand, backwash, can realize the gravel pack of horizontal well forward.This kind tool principal organ for set, hang, give up, back-up sand, backwash etc., complex structure.Thereby when adopting this kind tool gravel pack construction, it is numerous and diverse to construct, and the construction success rate is low;

Another kind of is the bottom filling instrument, and this kind tool only possesses the back-up sand function, can realize the reverse gravel pack of horizontal well.This filling process needs supporting backwash valve backwash function; Backwash valve structure commonly used at present is differential backwash valve; When the difference of backwash valve external pressure and interior pressure during greater than the design opening pressure, open automatically, just back-washable; But this backwash valve is prone to lose efficacy in the process of going into the well because under the effect of external force such as bending, the risk of perhaps opening in advance.

Because the defective that last known technology exists, the design people works out a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of the utility model according to the production design experiences of being engaged in this area and association area for many years.

The utility model content

The goal of the invention of the utility model is to be to provide a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, and it is simple in structure, and reliable operation matches with the SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe, can realize that filling and backwash are integrated.

For this reason; The utility model proposes a kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument; Include a sheathed successively from the inside to the outside inner core and a urceolus; Correspondence offers the interior pack hole that is connected, outer pack hole on the sidewall of said inner core and urceolus, is formed with at least one double wall groove that connects vertically on the external surface of said inner core, the intracavity inter-connection of an end of said double wall groove and said urceolus one end; It is stifled that the other end of said urceolus is connected with a tail through external screw thread, and said double wall groove is not communicated with said interior pack hole; Wherein, be embedded with a mobile sliding sleeve in the said inner core, filler opening in the corresponding sealing of said sliding sleeve is said; The one of which end is positioned at the spacing protuberance that forms in the said inner core; And the other end protrudes out said inner core, and is resisted against on first spring that said tail is installed with in stifled, and said sliding sleeve is offered the backwash hole on the sidewall near the other end; Said backwash hole is connected with the other end of said double wall groove, is provided with the guiding device of the inner chamber of the said sliding sleeve of an ability shutoff in the said sliding sleeve in addition.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument; Wherein, Said guiding device comprises a flow guiding head, one second spring, a valve ball and a ring boss, and said flow guiding head is through being located at an end of said sliding sleeve in the external screw thread, and it connects vertically offers at least one pod apertures; The intracavity inter-connection of said pod apertures and said sliding sleeve; Said ring boss shape is formed in the middle section of said sliding sleeve inner chamber, and it offers the runner with the intracavity inter-connection of said sliding sleeve vertically, and said second spring and valve ball are set in turn between said flow guiding head and the ring boss; The two ends of said second spring connect with said flow guiding head and said valve ball respectively, and the runner of said valve ball said ring boss of the corresponding shutoff of ability under the shoring of said second spring.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument wherein, further is provided with a baffle plate between the other end of said sliding sleeve and said first spring, and an end of said baffle plate passes through external thread bolt connection in said sliding sleeve, its other end and the corresponding butt of said first spring.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, wherein, the internal perisporium of said inner core one end is embedded with sealing ring.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, wherein, the external surface of said inner core is symmetrical is formed with two said double wall grooves.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument, wherein, said flow guiding head is along circumferentially being evenly equipped with four pod apertures.

Aforesaid SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument wherein, further is provided with an annular space portion between the inner surface of said urceolus and the external surface of said inner core, said annular space portion is connected with said double wall groove.

The SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument that the utility model proposes such as need not to set, hang, give up at mechanism, and is simple in structure, reduced the filling difficulty of construction; Itself and SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe match, and adopt the plug-in type butt joint, dock simple and easy; Adopt the two-layer pipe of inner core, urceolus, be designed with the double wall groove, be used for backwash, realize that filling and backwash are integrated, i.e. fixed tubular column backwash immediately after sand off has improved the backwash timeliness; Itself and existing SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe match, and can reduce the SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL construction risk, guarantee the reliability of stowing operation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is another the structural representation of the utility model, its demonstration be to revolve the structure after turning 90 degrees along the relative Fig. 1 of central axis;

Fig. 3 is the sectional view of A-A line among Fig. 1;

Fig. 4 is the sectional view of B-B line among Fig. 1;

Fig. 5 be along the C among Fig. 1 to partial view, its demonstration be the end construction of flow guiding head;

Fig. 6 is the sectional view of D-D line among Fig. 2;

Fig. 7 is connected in the use reference diagram of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe for the utility model.

The critical element label declaration:

1 packing tool, 11 inner cores

Pack hole 112 double wall grooves in 111

113 spacing protuberance 12 urceolus

121 outer pack hole 13 tails are stifled

131 first springs, 14 sliding sleeves

141 backwash holes, 142 ring boss

1421 runners, 15 guiding devices

151 flow guiding head, 1511 pod apertures

152 second springs, 153 valve balls

16 baffle plates, 17 sealing rings

2 SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipes, 21 surface pipes

22 protective casings, 23 completion screen casings

Pipe in the 24 pipe coverings 25

26 filling server D are by the well annular space

E annular space H annular space portion

The specific embodiment

Understand for technical characterictic, purpose and effect to the utility model have more clearly, contrast the specific embodiment of description of drawings the utility model at present:

Fig. 1 is the structural representation of the utility model; Fig. 2 is another the structural representation of the utility model, its demonstration be to revolve the structure after turning 90 degrees along the relative Fig. 1 of central axis; Fig. 3 is the sectional view of A-A line among Fig. 1; Fig. 4 is the sectional view of B-B line among Fig. 1; Fig. 5 be along the C among Fig. 1 to partial view, its demonstration be the end construction of flow guiding head; Fig. 6 is the sectional view of D-D line among Fig. 2.

Referring to Fig. 1 to Fig. 4, Fig. 6; A kind of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument 1 that the utility model proposes; It includes a sheathed successively from the inside to the outside inner core 11 and a urceolus 12, and correspondence offers interior pack hole 111, the outer pack hole 121 that is connected on the sidewall of said inner core 11 and urceolus 12, is formed with at least one double wall groove 112 that connects vertically on the external surface of said inner core 11; The intracavity inter-connection of one end of said double wall groove 112 and said urceolus 12 1 ends; The other end of said urceolus 12 is connected with a tail through external screw thread and blocks up 13, and said double wall groove 112 is not communicated with said interior pack hole 111, promptly in reality is implemented; This double wall groove 112 is different in the position that makes progress in 11 weeks of inner core with interior filler opening 111, and both are not communicated with;

Wherein, Be embedded with a mobile sliding sleeve 14 in the said inner core 11; Filler opening 111 in said sliding sleeve 14 corresponding sealings are said, the one of which end is positioned at the spacing protuberance 113 that forms in the said inner core 11, and the other end protrudes out said inner core 11; And be resisted against on first spring 131 that is installed with in the said tail stifled 13; Said sliding sleeve 14 is offered backwash hole 141 on the sidewall near the other end, said backwash hole 141 is connected with the other end of said double wall groove 112, is provided with the guiding device 15 of the inner chamber of the said sliding sleeve 14 of an ability shutoff in the said sliding sleeve 14 in addition.

Preferred embodiment be; Said guiding device 15 comprises a flow guiding head 151, one second spring 152, a valve ball 153 and a ring boss 142; Said flow guiding head 151 is through being located at an end of said sliding sleeve 14 in the external screw thread; It connects vertically offers at least one pod apertures 1511, the intracavity inter-connection of said pod apertures 1511 and said sliding sleeve 15, and said ring boss 142 is formed at the middle section of said sliding sleeve 14 inner chambers; It offers the runner 1421 with the intracavity inter-connection of said sliding sleeve 14 vertically; Said second spring 152 and valve ball 153 are set in turn between said flow guiding head 151 and the ring boss 142, and the two ends of said second spring 152 connect with said flow guiding head 151 and said valve ball 153 respectively, and the runner 1421 of said valve ball 153 said ring boss 142 of the corresponding shutoff of ability under the shoring of said second spring 152.Wherein, as shown in Figure 5, preferred said flow guiding head 151 is along circumferentially being evenly equipped with four pod apertures 1511.

Further, further be provided with a baffle plate 16 between said sliding sleeve 14 other ends and said first spring 131, an end of said baffle plate 16 passes through external thread bolt connection in said sliding sleeve 14, its other end and said first spring, 131 corresponding butts.

Sealing performance when being connected with other parts in order to improve inner core, the internal perisporium of said inner core 11 1 ends is embedded with sealing ring 17, and in addition, the external surface of said inner core 11 is symmetrical is formed with two said double wall grooves 112, to improve result of use.

Wherein, Further be provided with a H of annular space portion between the external surface of the inner surface of said urceolus 12 and said inner core 11; The said annular space H of portion is connected with said double wall groove 112, and combines foregoing to know, the H of this annular space portion is not communicated with said interior filler opening 111 and outer filler opening 121.Through this annular space portion is set, can further alleviate the weight of the utility model, and prevent alluvial mud in the down-hole.It is pointed out that this annular space portion shown in the figure be to be positioned on the external surface of inner core 11, but in actual the use not as limit, this annular space portion also can be arranged on the inner surface of urceolus.

Fig. 7 is connected in the use reference diagram of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe for the utility model.The SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument that the utility model proposes; In practical application, be connected in the end of SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe 2; As shown in Figure 7; This SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe 2 includes surface pipe 21, protective casing 22, completion screen casing 23, pipe covering 24, washing pipe 25 and filling server 26, and its concrete annexation and operating principle are prior art, do not do at this and give unnecessary details.

The concrete course of work of the utility model is: an end of the urceolus 12 of this packing tool 1 is connected in the end of completion screen casing 23, and is lowered in the horizontal well in the lump with this SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL sand control pipe 2, and through 24 well cementation of pipe covering; To the inner chamber of protective casing 22 and completion screen casing 23, be lowered to washing pipe 25 and filling server 26 from well head; Filling server 26 is protruded out in the sealing ring 17 that is connected in inner core 11 1 ends, the end formation of washing pipe 25, filling server 26 and inner core 11 is tightly connected; Annotate load fluid and gravel from well head pump in washing pipe 25; Load fluid and gravel get in the inner core 11 through filling server 26; Get into the inside of sliding sleeves 14 by the pod apertures of flow guiding head 15 1511, and impact valve ball 153, make ball valve 153 under the impact of the elastic force of second spring 152 and load fluid, thoroughly shut the runner 1421 of ring boss 142; With the inner chamber of sealing sliding sleeve 14, thereby make load fluid produce hydraulic pressure at an end of sliding sleeve 14; Continue to inject load fluid and gravel; Make sliding sleeve 14 in tail stifled 13, move under the effect of load fluid pressure and compress first spring 131; Pack hole 111 is opened simultaneously, with the intracavity inter-connection of inner core 11, and then make load fluid and gravel outer filler opening 121 by inner chamber, interior filler opening 111 and the urceolus 12 of inner core 11; Flow among the outer oil well annular space D of packing tool, realize the filling function;

After the sand off; Stop pump notes load fluid and gravel in washing pipe 25; Then load fluid disappears to the hydraulic coupling that sliding sleeve 14 1 ends form thereupon, and sliding sleeve 14 resets in inner core 11, moving the shoring of compressed first spring 131 under, and the interior filler opening 111 of sealing again; Pump is annotated backwash liquor among the annular space E that between washing pipe 25 and protective casing 22 and completion screen casing 23, is formed by well head; In aforementioned stowing operation, because filling server 26 only is nested with in inner core 11, it does not seal the inner chamber of urceolus 12 1 ends; Then this backwash liquor gets in the inner chamber of urceolus 12 1 ends of packing tool 1 along annular space E then; And along double wall groove 112 and backwash hole 141 runners that form get in the sliding sleeve 14, and impact valve ball 153 and move to left, compress second spring 152, the inner chamber of sliding sleeve 14 is communicated with; Backwash liquor gets into filling server 26 and washing pipe 25 through the pod apertures 1511 of flow guiding head 151 thereupon; And return ground by washing pipe 25 inside, take back ground with gravel residual in the sliding sleeve with washing pipe 25 and packing tool, thereby accomplish backwash packing tool and washing pipe.

The above is merely the schematic specific embodiment of the utility model, is not in order to limit the scope of the utility model.Any those skilled in the art, equivalent variations of under the prerequisite of design that does not break away from the utility model and principle, having done and modification all should belong to the scope that the utility model is protected.

Claims (9)

1. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument; It is characterized in that; Said SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL kit contains a sheathed successively from the inside to the outside inner core and a urceolus; Correspondence offers the interior pack hole that is connected, outer pack hole on the sidewall of said inner core and urceolus, is formed with at least one double wall groove that connects vertically on the external surface of said inner core, the intracavity inter-connection of an end of said double wall groove and said urceolus one end; It is stifled that the other end of said urceolus is connected with a tail through external screw thread, and said double wall groove is not communicated with said interior pack hole;
Wherein, be embedded with a mobile sliding sleeve in the said inner core, filler opening in the corresponding sealing of said sliding sleeve is said; The one of which end is positioned at the spacing protuberance that forms in the said inner core; And the other end protrudes out said inner core, and is resisted against on first spring that said tail is installed with in stifled, and said sliding sleeve is offered the backwash hole on the sidewall near the other end; Said backwash hole is connected with the other end of said double wall groove, is provided with the guiding device of the inner chamber of the said sliding sleeve of an ability shutoff in the said sliding sleeve in addition.
2. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 1; It is characterized in that; Said guiding device comprises a flow guiding head, one second spring, a valve ball and a ring boss, and said flow guiding head is through being located at an end of said sliding sleeve in the external screw thread, and it connects vertically offers at least one pod apertures; The intracavity inter-connection of said pod apertures and said sliding sleeve; Said ring boss shape is formed in the middle section of said sliding sleeve inner chamber, and it offers the runner with the intracavity inter-connection of said sliding sleeve vertically, and said second spring and valve ball are set in turn between said flow guiding head and the ring boss; The two ends of said second spring connect with said flow guiding head and said valve ball respectively, and the runner of said valve ball said ring boss of the corresponding shutoff of ability under the shoring of said second spring.
3. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 2; It is characterized in that; Further be provided with a baffle plate between the other end of said sliding sleeve and said first spring, an end of said baffle plate passes through external thread bolt connection in said sliding sleeve, its other end and the corresponding butt of said first spring.
4. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 3 is characterized in that, the internal perisporium of said inner core one end is embedded with sealing ring.
5. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 4 is characterized in that, the external surface of said inner core is symmetrical is formed with two said double wall grooves.
6. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 5 is characterized in that, said flow guiding head is along circumferentially being evenly equipped with four pod apertures.
7. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 1 is characterized in that, the internal perisporium of said inner core one end is embedded with sealing ring.
8. SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument as claimed in claim 1 is characterized in that, the external surface of said inner core is symmetrical is formed with two said double wall grooves.
9. like each described SIMULATION STUDY OF GRAVEL PACKING IN HORIZONTAL WELL instrument of claim 1 to 8, it is characterized in that, further be provided with an annular space portion between the inner surface of said urceolus and the external surface of said inner core, said annular space portion is connected with said double wall groove.
CN2012202302021U 2012-05-21 2012-05-21 Gravel filling tool for horizontal wells CN202560183U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012202302021U CN202560183U (en) 2012-05-21 2012-05-21 Gravel filling tool for horizontal wells

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012202302021U CN202560183U (en) 2012-05-21 2012-05-21 Gravel filling tool for horizontal wells

Publications (1)

Publication Number Publication Date
CN202560183U true CN202560183U (en) 2012-11-28

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103075131A (en) * 2012-12-12 2013-05-01 山东瑞丰石油技术有限责任公司 Open hole gravel packing tool and open hole gravel packing method for horizontal well
CN103266868A (en) * 2013-05-27 2013-08-28 中国石油天然气股份有限公司 Horizontal well subsection gravel pack tool
CN103266869A (en) * 2013-05-27 2013-08-28 中国石油天然气股份有限公司 Horizontal well subsection gravel pack service tool
CN103375150A (en) * 2013-08-08 2013-10-30 中国石油集团渤海钻探工程有限公司 Horizontal well gravel packing tool
CN107269252A (en) * 2017-07-06 2017-10-20 核工业北京化工冶金研究院 It is reverse in a kind of well to throw gravel instrument and its application method
CN107503716A (en) * 2016-06-14 2017-12-22 核工业北京化工冶金研究院 A kind of ground-dipping uranium extraction built-in filter inversely throws gravel device
CN107676058A (en) * 2017-10-11 2018-02-09 青岛海洋地质研究所 A kind of ocean gas hydrate mortar replacement exploitation method and quarrying apparatus
CN108240204A (en) * 2016-12-26 2018-07-03 中国石油天然气股份有限公司 For the gravel pack tools of sidetracked hole mechanical sand control

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103075131A (en) * 2012-12-12 2013-05-01 山东瑞丰石油技术有限责任公司 Open hole gravel packing tool and open hole gravel packing method for horizontal well
CN103075131B (en) * 2012-12-12 2015-11-25 山东瑞丰石油技术有限责任公司 A kind of horizontal well open-hole gravel pack instrument and placement method
CN103266868A (en) * 2013-05-27 2013-08-28 中国石油天然气股份有限公司 Horizontal well subsection gravel pack tool
CN103266869A (en) * 2013-05-27 2013-08-28 中国石油天然气股份有限公司 Horizontal well subsection gravel pack service tool
CN103266869B (en) * 2013-05-27 2015-09-09 中国石油天然气股份有限公司 Horizontal well subsection gravel pack service tool
CN103375150A (en) * 2013-08-08 2013-10-30 中国石油集团渤海钻探工程有限公司 Horizontal well gravel packing tool
CN107503716A (en) * 2016-06-14 2017-12-22 核工业北京化工冶金研究院 A kind of ground-dipping uranium extraction built-in filter inversely throws gravel device
CN108240204A (en) * 2016-12-26 2018-07-03 中国石油天然气股份有限公司 For the gravel pack tools of sidetracked hole mechanical sand control
CN108240204B (en) * 2016-12-26 2019-12-10 中国石油天然气股份有限公司 Gravel packing tool for sand control of sidetracking drilling machinery
CN107269252A (en) * 2017-07-06 2017-10-20 核工业北京化工冶金研究院 It is reverse in a kind of well to throw gravel instrument and its application method
CN107676058A (en) * 2017-10-11 2018-02-09 青岛海洋地质研究所 A kind of ocean gas hydrate mortar replacement exploitation method and quarrying apparatus
CN107676058B (en) * 2017-10-11 2019-04-16 青岛海洋地质研究所 A kind of ocean gas hydrate mortar replacement exploitation method and quarrying apparatus

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