CN201180486Y

CN201180486Y - Stabilizer used for slim-hole well drilling

Info

Publication number: CN201180486Y
Application number: CNU2007201606090U
Authority: CN
Inventors: 冯光通; 李作会; 曹向峰; 陈建隆; 戴荣东
Original assignee: Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Current assignee: Sinopec Oilfield Service Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Priority date: 2007-12-25
Filing date: 2007-12-25
Publication date: 2009-01-14
Anticipated expiration: 2017-12-25

Abstract

The utility model provides a stabilizer for drilling a well with a small borehole, consisting of a main body, a stabilizing body, a flow passage, an upper end female buckle and a lower end thread, wherein the stabilizing body consists of two helical stabilizing blocks; the stabilizing blocks and the axes of the main body form angles of between 15 and 25 degrees; the length of each stabilizing block is between 500 and 800mm; the rotating angle of each stabilizing block on the main body is more than or equal to 180 degrees; and the stabilizer is connected with a drilling string or a drilling head through an upper end thread and the lower end thread. The stabilizer is designed according to the characteristics of the small borehole bored well, adopts a design of double stabilizing blocks, increases the area of the flow passage of the stabilizer, reduces the flow resistance of fluid body outside the stabilizer, and improves passing capability of rock debris and other solid phase materials on the position of the stabilizer; meanwhile, the occurrence of 'pulling out a piston' phenomenon can be effectively prevented during the pulling out process, so the stabilizer is more advantageous to underground safety. The stabilizer has the advantages of simple structure, convenient installation and stable and reliable performance.

Description

A kind of stabilizer that is used for slimhole drilling

Technical field

The utility model relates to a kind of improvement that is used for the stabilizer of petroleum gas and mining site slimhole drilling.

Background technology

The oil field enters development late stage, and remaining oil high degree of dispersion, slim-hole become this type of low yield poor efficiency oil reservoir of exploitation, excavate the old liberated area potentiality, reduces the effective way of comprehensive development cost, raising oil reservoir development benefit.Along with the large tracts of land of SLIM-HOLE DRILLING TECHNOLOGY is promoted, there is the contradiction of using stabilizer to guarantee hole quality and downhole safety at present in the slimhole drilling work progress.If particularly easily tiltedly the district do not use stabilizer, in order to prevent hole deviation, have only light pressure to hang up and beat, be unfavorable for improving bit speed; And use simple drill finish quickly both to be unfavorable for applying of the pressure of the drill in the drilling process, the pressure of the drill well straightening is appearring being unfavorable for again under the situation of hole deviation controlling.The slim-hole annular clearance is less, and circulation presses consumption high, and annular pressure lost accounts for whole circulation and presses more than 50% of consumption, if use traditional three to stablize the piece stabilizer, stabilizer runner area of passage is less, certainly will increase annular pressure lost; In addition, use traditional three to stablize the piece stabilizer and make a trip and be hampered easily, particularly the loose stratum on the stratum pulls out of hole and causes " pulling out piston " phenomenon easily, pulls out the stratum of collapsing, and is unfavorable for downhole safety.

In order to realize under the slimhole drilling condition, by using stabilizer to play the purpose of anti-oblique well straightening, raising bit speed, can reduce the outer annular space fluid resistance of stabilizer again, avoid trip-out to be hampered, improve the safety of slim-hole stabilizer drilling assembly, strengthen the compliance of stabilizer in slim-hole, the utility model that proposes according to above-mentioned technical background.

Summary of the invention

For overcoming unfavorable factor in the above-mentioned drilling process, this stabilizer is made up of body, liptinite, runner, upper end box, lower end screw thread.Liptinite is fixed on the body, and stabilizer connects with drill string or drill bit by the upper and lower side screw thread.The purpose of this utility model is to provide a kind of compact conformation, easy to operate, the stabilizer that is applicable to slimhole drilling technology.

The utility model adopts following technical scheme:

Liptinite 2 is stablized piece (2-a, 2-b) by two spirals and is formed, and stablizes piece (2-a, 2-b) and body 1 axis angle 15～25 degree, length 500～800mm, and the anglec of rotation of each stable piece (2-a, 2-b) on body 1 is not less than 180 degree.Spiral is stablized the width of the width of piece (2-a, 2-b) upper end 6 greater than lower end 7, upper end 6 and bottom 7 equal chamferings.Runner 3 even sprayed wc coatings.Link by upper end box 4 and top drilling tool, link with lower drilling tool or drill bit with crossing bottom screw thread 5, bottom screw thread 5 can be that box also can be a pin thread.

The more existing stabilizer of this stabilizer has following advantage:

1, according to the slimhole drilling characteristics, adopt the design of bistable piece, increased the stabilizer flow area, reduced the flow resistance of stabilizer outer fluid, improved landwaste and other solid matter handling capacity in the stabilizer position;

2, stablize the piece chamfering, reduced in the process that makes a trip scratch the borehole wall; Runner is up-narrow and down-wide shape, and mud cake is not easy compacting in runner in trip-out process, blocks runner, can effectively avoid the generation of trip-out " pulling out piston " phenomenon, more helps downhole safety;

3, easy to operate, do not increase other drill-well operation and special tool, stable and reliable for performance.

Description of drawings:

Fig. 1 the utility model patent structure schematic diagram

Fig. 2 A-A position sectional view

Description of drawings:

1. body 2. liptinites 3. runners 4. upper end pin threads

5. 7. liptinite lower ends, lower end screw thread 6. liptinites upper ends

Stablize piece 2-a. stablize piece 2-b.

The specific embodiment

Now in conjunction with Fig. 1, Fig. 2 to its practical novel being further described.The utility model is installed in the bottomhole assembly as required, gets into the end down.In drilling process, liptinite contacts with the borehole wall, because the anglec of rotation of each stable piece of two stable pieces (2-a, 2-b) on body is not less than 180 degree, in case guaranteed stabilizer run-off the straight in pit shaft, two phasic difference 180 degree are mutually arranged between stabilizer and the pit shaft at least, and two contact points on same axial plane can effectively not resisted overturn moment.Drilling fluid is flowed into by runner 3 lower ends of stabilizer, flows out from runner 3 upper ends, and under the acting in conjunction of liptinite 2 helixes and drill string rotating, turbulent flow rises in the shape of a spiral, the rolling action that helps improving landwaste.Owing to stablize the width of the width of piece (2-a, 2-b) upper end 6 greater than lower end 7, so the outlet of runner 3 upper ends is narrow than the lower end, can produce very fast flow velocity and help cutting carring and leave the stabilizer position, can effectively prevent midway because of landwaste sedimentation after the unexpected termination of pumping of a variety of causes to the shutoff of stabilizer runner 3.

In the process of rising, the effect of liptinite upper end 6 chamferings can avoid liptinite 2 directly to scrape the mud cake of cutting on the borehole wall, and under ramp effect, general mud cake can be compacted on the borehole wall.Because runner 3 lower ends outlets is wide than the upper end, even have landwaste or mud cake to enter stabilizer runner 3, also can not produce compaction, but under follow-up the pushing who enters thing, slippage from liptinite 2 sidewalls enters the bottom annular space.Runner 3 even sprayed wc coatings can effectively be avoided the absorption of flow path wall to the shale solid phase simultaneously, have strengthened the handling capacity of runner 3 in trip-out process more.Thereby avoided that runner 3 is blocked in the trip-out process, caused " pulling out piston " phenomenon, effectively guaranteed downhole safety.

Claims

1, a kind of stabilizer that is used for slimhole drilling, comprise body (1), liptinite (2), runner (3), upper end box (4), lower end screw thread (5), it is characterized in that liptinite (2) stablizes piece (2-a, 2-b) by two spirals and form, stablize piece (2-a, 2-b) and body (1) axis angle 15～25 degree, length 500～800mm, each stable piece (2-a, the 2-b) anglec of rotation 〉=180 degree on body (1).

2, according to the described a kind of stabilizer that is used for slimhole drilling of claim 1, it is characterized in that spiral stablizes the width of the width of piece (2-a, 2-b) upper end (6) greater than lower end (7), upper end (6) and bottom (7) be chamfering all.

3,, it is characterized in that evenly sprayed wc coating of runner (3) according to the described a kind of stabilizer that is used for slimhole drilling of claim 1.