CN2278757Y

CN2278757Y - Flexible pipe drilling tool for super-short radium horizontal drilling

Info

Publication number: CN2278757Y
Application number: CN 96249291
Authority: CN
Inventors: 张书明; 陆波; 高建清
Original assignee: DRILLING TECHNIQUE INST ZHONGYUAN PETROLEUM EXPLORATION ADMINISTRATION
Current assignee: DRILLING TECHNIQUE INST ZHONGYUAN PETROLEUM EXPLORATION ADMINISTRATION
Priority date: 1996-12-26
Filing date: 1996-12-26
Publication date: 1998-04-15
Anticipated expiration: 2006-12-26

Abstract

The utility model relates to a flexible pipe drilling tool for super-short radium horizontal drilling used for the development and production in oil exploration. A 90 DEG whipstock is composed of a sliding joint, a sector ring hollow connecting sheet connected in series by the elastic reinforcing steel bar with the curvature radius less than 1 meter, and an elastic curve outer shell composed of a lower hollow end cap, and is internally sleeved in a flexible drilling pipe. The flexible drilling pipe comprises an upper joint able to be connected with a screw drill, a universal flexible hollow outer shell composed of tubiform sphere link rings connected by pins in sequence, and a lower joint able to be connected with a drill head. Hackle slips are equipped in the upper and the lower joints to clip-connect a pressure resistant rubber seal pipe in the universal flexible hollow outer shell.

Description

The gentle pipe bit tool of a kind of ultra-short radius horizontal drilling

The utility model relates to a kind of gentle pipe bit tool of super short radial horizontal well drilling well that petroleum exploration and development is produced that is used for, and belongs to recovery of subterranean fluid drilling engineering technical field of tools.

Existing horizontal stiffness drilling tool, comprise long, in, the Short Radius Horizontal Wells drilling well because the rigidity of drilling tool is drilled into horizontal payzone section from vertical section, need creep into long well section, radius of curvature is bigger, thereby the drilling cost height, poor accuracy hits.At present, in brainstorm project is listed the ultra-short radius horizontal drilling technology by China National Petroleum Corporation (CNPC), but does not still have achievement.U.S. geophysics company has a ultra-short radius horizontal drilling technology, utilize high-pressure rotary jet drilling tool hydraulic drilling to creep into, the said firm in the world, technological service only is provided, the architectural feature of underground its special tool, but there is following major defect in this technology: use high-pressure rotary jet rock-breaking to creep into, need to be equipped with a lot of ground special equipment and instrument, comprise high pressure fracturing unit etc., can not use the conventional drilling means; Borehole diameter is little and regular inadequately.

The purpose of this utility model is to overcome the defective that exists in the prior art and a kind of radius of curvature that designs can be less than the special-purpose gentle pipe bit tool of 1 meter ultra-short radius drilling well, it and conventional drilling equipment are used, can get out the horizontal segment well of rule, reduce the drilling well integrated cost.

The purpose of this utility model can realize by following measure:

Gentle pipe bit tool of the present utility model comprises 90 ° of kick-off devices and flexible drilling pipe two parts composition, wherein:

(1) 90 ° of kick-off device is made up of the flexible drilling pipe of curved shell of elasticity and interior suit thereof, the curved shell of elasticity is made up of less than the hollow brace of fan-shaped ring and the following hollow end cap of 1 meter elasticity reinforcing bar series connection slip joint, radius of curvature, slip joint is connected with the shell of common screw drilling tool, be provided with elasticity reinforcing bar slip stopper slot in the bottom of slip joint, one end of elasticity reinforcing bar places in the slip stopper slot, and the hollow end cap of the other end and soft shell bottom is affixed; Universal flexible hollow shell and liner pressure-resistant rubber sealed tube thereof that the tubulose sphere connecting ring that flexible drilling pipe connects successively by the top connection that can be connected with the axle of common screw drilling tool, with pin is formed are formed with the lower contact that can be connected with drill bit, axle by helicoid hydraulic motor drives universal flexible drilling pipe rotation, and moment of torsion is passed to drill bit.

(2) flexible drilling pipe both can be socketed in 90 ° of kick-off devices, after finishing 90 ° of deflectings, also it can be connected with the common screw drilling tool with drill bit, was lowered to proceed level to the target zone of 90 ° of angle buildup intervals and creep into.

The utlity model has following advantage:

(1) 90 ° of kick-off device all can be connected with the common screw drilling tool with flexible drilling pipe, finishes 90 ° of deflectings and level is crept into by conventional drilling equipment, and therefore the angle buildup interval radius of curvature can, make invalid drilling depth less less than 1 meter, has reduced the drilling well integrated cost;

(2) utilize drill bit, flex-stem and helicoid hydraulic motor in target zone, to carry out machinery, waterpower combined-breaking rock level is crept into, the well rule.

Accompanying drawing 1 is 90 ° of kick-off device structural representations of the present utility model.

Accompanying drawing 2 is a flexible drilling pipe structural representation of the present utility model.

Accompanying drawing 3 is the cross section structure schematic diagram of flexible drilling pipe A-A of the present utility model, B-B.

The utility model will be further described below in conjunction with accompanying drawing:

The utility model comprises 90 ° of kick-off devices and flexible drilling pipe two parts, Fig. 1 shows 90 ° of kick-off device structural representations, crooked 90 ° under normal conditions of kick-off devices, go up and helicoid hydraulic motor 1, be connected with drill bit 10 down, it is made up of curved shell of elasticity and the flexible drilling pipe 5 of interior installation thereof, the curved shell of elasticity is by slip joint 2, at least form less than the hollow brace 6 of fan-shaped ring and the following hollow end cap 8 of 1 meter elasticity reinforcing bar 4 series connection by two radius of curvature, slip joint 2 is connected with the shell of common screw drilling tool 1, be provided with elasticity reinforcing bar slip stopper slot 3 in the bottom of slip joint 2, elasticity reinforcing bar 4 an end place in the slip stopper slot 3 after, the hollow brace 6 of fan-shaped ring is serially connected on the elasticity reinforcing bar 4, then that hollow end cap under the other end of elasticity reinforcing bar 4 and the soft shell 8 is affixed; The structure of flexible drilling pipe 5 is seen accompanying drawing 2 and accompanying drawing 3, it is by the top connection 11 that can spin with the axle of common screw drilling tool 1, the tubulose sphere connecting ring 15 that connects successively with

16,17, the 18 universal flexible hollow shells of forming are formed with the lower contact 22 that can be connected with drill bit, the two ends of universal flexible hollow shell are fixed in respectively, in the lower contact, in top connection, be provided with

zigzag slips

13,14, be provided with zigzag slips 22 in the lower contact, 21, in the universal flexible hollow shell of pressure-resistant rubber sealed tube 19 clampings, top connection 11 spins with the axle of common screw drilling tool 1.During deflecting, drill bit is connected with helicoid hydraulic motor 1 with 90 ° of kick-off devices successively, under the effect of external force, 90 ° of kick-off devices are drawn into the linearity G.I.H, achieve the goal behind the layer, start slush pump, the axle rotation of drive screw drilling tool 1, the flexible drilling pipe 5 that drives in 90 ° of kick-off devices rotates, and the button square is passed to drill bit 10, simultaneously, the pressure of the drill passes through drill collar, helicoid hydraulic motor 1, the curved shell of the elasticity of 90 ° of kick-off devices is passed to drill bit 10, thus broken formation, along with the increase of drilling depth, progressively be bent to 90 ° under the elastic force effect of the elasticity reinforcing bar 4 of 90 ° of kick-off devices in its soft shell, pull out of hole after finishing deflecting; When level is crept into, drill bit 10 is connected with helicoid hydraulic motor 1 with flexible drilling pipe successively and, starts helicoid hydraulic motor, drive flexible drilling pipe and rotate, moment of torsion and hydraulic pressure transfer are carried out level to drill bit creep into down to target zone.

Claims

1. one kind is used for super short radial horizontal well drilling well that petroleum exploration and development produces with 90 ° of kick-off devices, it is characterized in that:

90 ° of kick-off devices are made up of the flexible drilling pipe (5) of curved shell of elasticity and interior socket thereof;

1) the curved shell of elasticity is made up of less than the hollow brace of fan-shaped ring (6) and the following hollow end cap (8) of 1 meter elasticity reinforcing bar (4) series connection slip joint (2), radius of curvature, slip joint (2) upper end is provided with the screw thread that can be connected with the shell of common screw drilling tool (1), its lower end is provided with the slip stopper slot (3) of elasticity reinforcing bar (4), the hollow brace of fan-shaped ring (6) is serially connected on the elasticity reinforcing bar (4), one end of elasticity reinforcing bar (4) places in the slip stopper slot (3), and the other end is affixed with following hollow end cap (8);

2) flexible drilling pipe is by the top connection (11) that can be connected with the axle of common screw drilling tool (1), with the tubulose sphere connecting ring (15 that connects successively of pin (16), 17,18) the universal flexible hollow shell of Zu Chenging with can be connected with drill bit lower contact (22) form, in top connection (11), be provided with zigzag slips (13,14), lower contact is provided with zigzag slips (22 in (22), 21), pressure-resistant rubber sealed tube (19) can be connected in the universal flexible hollow shell.

2. one kind is used for the flexible drilling pipe of super short radial horizontal well drilling well that petroleum exploration and development is produced, comprise shell and upper and lower joint, it is characterized in that shell is the tubulose sphere connecting ring (15 that connects successively by with pin (16), 17,18) the universal flexible hollow shell of Zu Chenging with can be connected with drill bit lower contact (22) form, in top connection (11), be provided with zigzag slips (13,14), lower contact is provided with zigzag slips (22 in (22), 21), pressure-resistant rubber sealed tube (19) can be connected in the universal flexible hollow shell.