CN202047748U - Ultra short radius horizontal well flexible drilling tool - Google Patents

Ultra short radius horizontal well flexible drilling tool Download PDF

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Publication number
CN202047748U
CN202047748U CN2011201146271U CN201120114627U CN202047748U CN 202047748 U CN202047748 U CN 202047748U CN 2011201146271 U CN2011201146271 U CN 2011201146271U CN 201120114627 U CN201120114627 U CN 201120114627U CN 202047748 U CN202047748 U CN 202047748U
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CN
China
Prior art keywords
ball
bulb
contact
ball seat
flex
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Application number
CN2011201146271U
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Chinese (zh)
Inventor
赵海涛
韩新宇
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北京百利时能源技术有限责任公司
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Priority to CN2011201146271U priority Critical patent/CN202047748U/en
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Publication of CN202047748U publication Critical patent/CN202047748U/en

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Abstract

The utility model discloses an ultra short radius horizontal well flexible drilling tool, relates to special equipment for well drilling and aims to provide the ultra short radius horizontal well flexible drilling tool which has small bending radius and low cost and is simple and convenient to operate. The ultra short radius horizontal well flexible drilling tool comprises an upper joint, a lower joint, a bent shell and a plurality of flexible drill stem units, wherein each flexible drill stem unit comprises a ball head body, a ball seat, an upper cover and a lower cover; the upper end of each ball head body is provided with a ball head part; each ball head body is in transmission connection with the corresponding ball seat; each upper cover is fixedly connected with the corresponding ball head body and the corresponding ball seat through a screw thread part on the inner surface of the upper cover; the inner surface of each lower cover is fixedly connected with the lower part of the corresponding ball seat through a screw thread part of the lower cover; the inner surface of the lower part of each ball seat and the inner surface of the lower part of each lower cover are respectively provided with an approximately hemispherical upper groove and an approximately hemispherical lower groove; the upper grooves and the lower grooves are used for containing the adjacent ball head parts; the inner surface of each upper groove is provided with a plurality of through holes; each ball head part is provided with an inner groove; one steel ball is arranged in each through hole; and part of each steel ball is positioned in the corresponding inner groove.

Description

The super short radial horizontal well flexible drill string

Technical field

The utility model relates to a kind of special installation of drilling well, particularly relates to a kind of flexible drill string that is used for directed drilling.

Background technology

At present, the most of old filed of China has entered the middle and later periods of exploitation, main force's block pressure coefficient is more and more lower, adopt traditional drilling mode exploitation economy worse and worse, how to utilize the drilling well means to improve the remaining oil production efficiency, improve the oil field development effect, reducing development cost and evading the oil field development risk has become an important topic.In the existing oil exploitation industry, the small curve long radius of its enforcement, middle radius, short radius all exist many shortcomings such as cost height, drilling period length, DeGrain.Boring super short radial horizontal well in slim-hole, is the new technology that begins one's study the external eighties in 20th century and develop.Mainly be two kinds of methods: the one, with the broken rock of high-pressure injection, this technology is the high-pressure water jet rock-breaking and well-drilling because of what use, need to be equipped with that more ground special equipment and instrument, cost are higher, output is than unbalance, and be subjected to the restriction in lithology, well depth and expansion super-large diameter hole, dwindled range of application, and also there are defectives such as the horizontal well wellbore construction complexity that gets out is irregular, drilling period is long, application life is short, horizontal range is limited in this method; The 2nd, adopt mud motor, must be hinged screw rod or turbine, its shortcoming is that power drilling tool is fragile, the cost height, build angle rate is limited, and safety is not high.

The utility model content

It is little that the technical problems to be solved in the utility model provides a kind of bend radius, the super short radial horizontal well flexible drill string that cost is low, easy and simple to handle.

The utility model super short radial horizontal well flexible drill string, comprise top connection, lower contact, curved envelope and some flex-stems unit, described some flex-stems unit joins end to end and is positioned at curved envelope, described top connection is fixedlyed connected with flex-stem unit topmost, described lower contact is fixedlyed connected with flex-stem unit bottom, evenly offer some circumferential breach on the described curved envelope vertically, wherein said each flex-stem unit comprises the bulb body, ball seat, loam cake and lower cover, the upper end of described bulb body is provided with ball head, the bottom of bulb body is in transmission connection by the top of spline and ball seat, described loam cake is sleeved on the outside on bulb body middle part and ball seat top, and the threaded portion that passes through inner surface is fixedlyed connected with ball seat top with bulb body middle part, described lower cover upper inside surface is fixedly connected on the ball seat bottom by threaded portion, the inner surface of described ball seat bottom and lower cover lower inner surface are respectively arranged with upper groove and the low groove that roughly is dome-type, described upper groove and low groove have held ball head in the adjacent flex-stem unit, the inner surface of described upper groove is along circumferentially offering some through holes, offer inner groovy with the corresponding position of through hole on the described ball head, in described each through hole steel ball is installed, the part of described steel ball is positioned in the middle of the inner groovy, and the external surface at described ball seat middle part is equipped with spring bearing.

The utility model super short radial horizontal well flexible drill string, wherein said lower contact is connected with bottom flex-stem unit by a lower contact bulb, the upper end of described lower contact bulb is provided with the lower contact ball head, described lower contact bulb is positioned in the middle of the upper groove and low groove of flex-stem unit bottom, fixedly connected by threaded portion with lower contact in the bottom of described lower contact bulb, the lower end of described curved envelope is fixedly connected with one section lower house, described lower house is positioned at the outside of lower contact bulb, between lower house and the lower contact bulb taper roll bearing is installed, between lower house and the lower contact thrust ball bearing is installed;

The lower end of described top connection is stretched in the curved envelope, be in transmission connection by spline with the ball seat of flex-stem unit topmost, and be threaded with the loam cake of topmost flex-stem unit, the upper end of described curved envelope is fixedly connected with one section upper shell, described upper shell is positioned at the outside of top connection, is provided with self-aligning ball bearing between upper shell and the top connection.

The utility model super short radial horizontal well flexible drill string, the part that wherein said lower cover is threaded with ball seat is provided with spacer pin, and the inner of described spacer pin is radially passed lower cover and is positioned at ball seat.

The utility model super short radial horizontal well flexible drill string is provided with first sealing ring between wherein said ball head and the upper groove.

The utility model super short radial horizontal well flexible drill string is provided with second sealing ring between wherein said bulb body lower end and the ball seat.

The utility model super short radial horizontal well flexible drill string, wherein said curved envelope comprises the plurality of sections housing parts, the two ends of described every section housing parts are fixedly connected with left-handed short circuit and dextrorotation short circuit respectively, and described adjacent left-handed short circuit is connected by box cupling with the dextrorotation short circuit.

After the utility model super short radial horizontal well flexible drill string adopts technique scheme, make minimum bending radius can reach 2.2m, overcome shortcomings such as existing horizontal well drilling instrument flexibility is poor, the turning radius of curvature is big, use this instrument can be from former well big slope in the reservoir section, be that ultra-short radius gets out the level production runner that reaches more than 20 meters, effectively increase drainage area, improve recovery ratio, many wells of individual layer face and the many wells of stage construction be can realize, various borehole conditions and oil reservoir type are fit to.

Below in conjunction with accompanying drawing super short radial horizontal well flexible drill string of the present utility model is described further.

Description of drawings

Fig. 1 is the structural representation on the utility model super short radial horizontal well flexible drill string top;

Fig. 2 is the structural representation of the utility model super short radial horizontal well flexible drill string lower part;

Fig. 3 is the partial enlarged drawing at I place among Fig. 2.

The specific embodiment

As depicted in figs. 1 and 2, the utility model super short radial horizontal well flexible drill string comprises top connection 1, lower contact 2, curved envelope 3 and some flex-stems unit 4, and some flex-stems unit 4 joins end to end and is positioned at curved envelope 3.In conjunction with shown in Figure 3, each flex-stem unit 4 comprises bulb body 6, ball seat 7, loam cake 8 and lower cover 9, the upper end of bulb body 6 is provided with ball head 10, and the bottom of bulb body 6 is in transmission connection by the top of spline 11 with ball seat 7, is provided with second sealing ring 27 between bulb body 6 lower ends and the ball seat 7.Loam cake 8 is sleeved on the outside on bulb body 6 middle parts and ball seat 7 tops, and the threaded portion that passes through inner surface is fixedlyed connected with ball seat 7 tops with bulb body 6 middle parts, lower cover 9 upper inside surface are fixedly connected on ball seat 7 bottoms by threaded portion, the part that lower cover 9 is threaded with ball seat 7 is provided with spacer pin 25, the inner of spacer pin 25 is radially passed lower cover 9 and is positioned at ball seat 7, spacer pin 25 is used for lower cover 9 and ball seat 7 closely are fixed together, and prevents that lower cover 9 and ball seat 7 from getting loose.The inner surface of ball seat 7 bottoms and lower cover 9 lower inner surface are respectively arranged with upper groove 12 and the low groove 13 that roughly is dome-type, upper groove 12 and low groove 13 have held ball head 10 in the adjacent flex-stem unit 4, the inner surface of upper groove 12 is along circumferentially offering 8 through holes 14, offer 8 inner groovies 15 with through hole 14 corresponding positions on the ball head 10, in each through hole 14 steel ball 16 is installed, the part of steel ball 16 is positioned in the middle of the inner groovy 15, is provided with first sealing ring 26 between ball head 10 and the upper groove 12.The external surface at ball seat 7 middle parts is equipped with spring bearing 17, and spring bearing 17 is used for flex-stem unit 4 is supported in the curved envelope 3.

Lower contact 2 is by a lower contact bulb 18 and bottom flex-stem unit 4 " be connected; the upper end of lower contact bulb 18 is provided with lower contact ball head 19; lower contact bulb 18 is positioned at flex-stem unit 4 bottom " upper groove 12 " and low groove 13 " in the middle of, the bottom of lower contact bulb 18 and lower contact 2 are fixedlyed connected by threaded portion, the lower end of curved envelope 3 is fixedly connected with one section lower house 20, lower house 20 is positioned at the outside of lower contact bulb 18, between lower house 20 and the lower contact bulb 18 taper roll bearing 21 is installed, between lower house 20 and the lower contact 2 thrust ball bearing 22 is installed.

The lower end of top connection 1 is stretched in the curved envelope 3, be in transmission connection by spline with the ball seat 7 of topmost flex-stem unit 4 ', and be threaded with the loam cake 8 ' of topmost flex-stem unit 4 ', the upper end of curved envelope 3 is fixedly connected with one section upper shell 23, upper shell 23 is positioned at the outside of top connection 1, is provided with self-aligning ball bearing 24 between upper shell 23 and the top connection 1.

Curved envelope 3 comprises plurality of sections housing parts 28, evenly offer some circumferential breach 5 on the housing parts 28 vertically, make whole drilling tool can realize carrying out directional curvature to circumferential breach 5 one sides, the two ends of every section housing parts 28 are fixedly connected with left-handed short circuit 29 and dextrorotation short circuit 30 respectively, and adjacent left-handed short circuit 29 is connected by box cupling 31 with dextrorotation short circuit 30.

Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.

Claims (6)

1. super short radial horizontal well flexible drill string, comprise top connection (1), lower contact (2), curved envelope (3) and some flex-stems unit (4), described some flex-stems unit (4) join end to end and are positioned at curved envelope (3), described top connection (1) is fixedlyed connected with flex-stem unit (4 ') topmost, described lower contact (2) and bottom flex-stem unit (4 ") to fixedly connected; evenly offer some circumferential breach (5) on the described curved envelope (3) vertically; it is characterized in that: described each flex-stem unit (4) comprises bulb body (6); ball seat (7); loam cake (8) and lower cover (9); the upper end of described bulb body (6) is provided with ball head (10), the bottom of bulb body (6) is in transmission connection by the top of spline (11) with ball seat (7), described loam cake (8) is sleeved on the outside on bulb body (6) middle part and ball seat (7) top, and the threaded portion that passes through inner surface is fixedlyed connected with ball seat (7) top with bulb body (6) middle part, described lower cover (9) upper inside surface is fixedly connected on ball seat (7) bottom by threaded portion, the inner surface of described ball seat (7) bottom and lower cover (9) lower inner surface are respectively arranged with upper groove (12) and the low groove (13) that roughly is dome-type, described upper groove (12) and low groove (13) have held ball head (10) in the adjacent flex-stem unit (4), the inner surface of described upper groove (12) is along circumferentially offering some through holes (14), described ball head (10) is gone up and the corresponding position of through hole (14) offers inner groovy (15), steel ball (16) is installed in described each through hole (14), the part of described steel ball (16) is positioned in the middle of the inner groovy (15), and the external surface at described ball seat (7) middle part is equipped with spring bearing (17).
2. super short radial horizontal well flexible drill string according to claim 1, it is characterized in that: described lower contact (2) is connected by a lower contact bulb (18) and bottom flex-stem unit (4 "); the upper end of described lower contact bulb (18) is provided with lower contact ball head (19); described lower contact bulb (18) is positioned in the middle of the upper groove (12 ") of bottom flex-stem unit (4 ") and the low groove (13 "), fixedly connected by threaded portion with lower contact (2) in the bottom of described lower contact bulb (18), the lower end of described curved envelope (3) is fixedly connected with one section lower house (20), described lower house (20) is positioned at the outside of lower contact bulb (18), between lower house (20) and the lower contact bulb (18) taper roll bearing (21) is installed, between lower house (20) and the lower contact (2) thrust ball bearing (22) is installed;
The lower end of described top connection (1) is stretched in the curved envelope (3), be in transmission connection by spline with the ball seat (7 ') of flex-stem unit (4 ') topmost, and be threaded with the loam cake (8 ') of topmost flex-stem unit (4 '), the upper end of described curved envelope (3) is fixedly connected with one section upper shell (23), described upper shell (23) is positioned at the outside of top connection (1), is provided with self-aligning ball bearing (24) between upper shell (23) and the top connection (1).
3. super short radial horizontal well flexible drill string according to claim 2, it is characterized in that: the part that described lower cover (9) is threaded with ball seat (7) is provided with spacer pin (25), and the inner of described spacer pin (25) is radially passed lower cover (9) and is positioned at ball seat (7).
4. super short radial horizontal well flexible drill string according to claim 3 is characterized in that: be provided with first sealing ring (26) between described ball head (10) and the upper groove (12).
5. super short radial horizontal well flexible drill string according to claim 4 is characterized in that: be provided with second sealing ring (27) between described bulb body (6) lower end and the ball seat (7).
6. super short radial horizontal well flexible drill string according to claim 5, it is characterized in that: described curved envelope (3) comprises plurality of sections housing parts (28), the two ends of described every section housing parts (28) are fixedly connected with left-handed short circuit (29) and dextrorotation short circuit (30) respectively, and described adjacent left-handed short circuit (29) is connected by box cupling (31) with dextrorotation short circuit (30).
CN2011201146271U 2011-04-19 2011-04-19 Ultra short radius horizontal well flexible drilling tool CN202047748U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201146271U CN202047748U (en) 2011-04-19 2011-04-19 Ultra short radius horizontal well flexible drilling tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201146271U CN202047748U (en) 2011-04-19 2011-04-19 Ultra short radius horizontal well flexible drilling tool

Publications (1)

Publication Number Publication Date
CN202047748U true CN202047748U (en) 2011-11-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643892A (en) * 2013-12-17 2014-03-19 西南石油大学 Tool for feeding drill strings under drive of screw
CN106089139A (en) * 2016-08-10 2016-11-09 中国石油天然气股份有限公司 Flexible coring tool
CN106121575A (en) * 2016-08-10 2016-11-16 中国石油天然气股份有限公司 Flexible coring tool
CN106150401A (en) * 2016-08-10 2016-11-23 中国石油天然气股份有限公司 Flex-stem and drilling equipment thereof
CN106223871A (en) * 2016-08-10 2016-12-14 中国石油天然气股份有限公司 Flex-stem
CN106761401A (en) * 2016-11-15 2017-05-31 中国石油天然气股份有限公司 Horizontal well drilling tool
CN107869312A (en) * 2017-10-12 2018-04-03 中国石油天然气股份有限公司 Flex-stem
CN108678668A (en) * 2018-05-08 2018-10-19 中国石油集团渤海钻探工程有限公司 A kind of barefoot laterally drilling horizontal well deflecting tool

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643892A (en) * 2013-12-17 2014-03-19 西南石油大学 Tool for feeding drill strings under drive of screw
CN103643892B (en) * 2013-12-17 2015-08-05 西南石油大学 A kind of screw drive drill string sends instrument to
CN106089139A (en) * 2016-08-10 2016-11-09 中国石油天然气股份有限公司 Flexible coring tool
CN106121575A (en) * 2016-08-10 2016-11-16 中国石油天然气股份有限公司 Flexible coring tool
CN106150401A (en) * 2016-08-10 2016-11-23 中国石油天然气股份有限公司 Flex-stem and drilling equipment thereof
CN106223871A (en) * 2016-08-10 2016-12-14 中国石油天然气股份有限公司 Flex-stem
CN106223871B (en) * 2016-08-10 2019-04-12 中国石油天然气股份有限公司 Flex-stem
CN106121575B (en) * 2016-08-10 2019-05-07 中国石油天然气股份有限公司 Flexible coring tool
CN106150401B (en) * 2016-08-10 2020-01-07 中国石油天然气股份有限公司 Flexible drill pipe and drilling equipment thereof
CN106761401A (en) * 2016-11-15 2017-05-31 中国石油天然气股份有限公司 Horizontal well drilling tool
CN107869312A (en) * 2017-10-12 2018-04-03 中国石油天然气股份有限公司 Flex-stem
CN108678668A (en) * 2018-05-08 2018-10-19 中国石油集团渤海钻探工程有限公司 A kind of barefoot laterally drilling horizontal well deflecting tool

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GR01 Patent grant
C14 Grant of patent or utility model
CP03 Change of name, title or address

Address after: Two Beijing area 100102 Chaoyang District Wangjing new industrial zone in Lize Park No. 208 Building No. 3 room 3310

Patentee after: Beijing bezenith energy technology Limited by Share Ltd

Address before: 100101 Beijing Chaoyang District Anli Road, No. 60 hospital runfengdeshang yuan B-1801

Patentee before: Beijing Bailishi Energy Technology Co., Ltd.

C56 Change in the name or address of the patentee