CN2252878Y

CN2252878Y - Bit guider

Info

Publication number: CN2252878Y
Application number: CN 96211800
Authority: CN
Inventors: 王国祥
Original assignee: Drilling Co of Sinopec Jiangsu Petroleum Exploration Bureau
Current assignee: Drilling Co of Sinopec Jiangsu Petroleum Exploration Bureau
Priority date: 1996-05-31
Filing date: 1996-05-31
Publication date: 1997-04-23
Anticipated expiration: 2006-05-31

Abstract

The utility model relates to a guider for directional drilling wells, composed of an upper and a lower joints, a core pipe, a reducing sleeve, a rudder plate, a push pin, a spacing ring, a bearing, etc. The guider is arranged on the upper part of a drill bit. When the guider is used in an underground well, the reducing sleeve sheathed outside the core pipe is provided with a lock pin which locks the core pipe, a pump is opened and unlocked after the guider reaches the bottom of the well, and the rudder plate on the reducing sleeve is opened and is extended into a well wall to fix the position of the diameter guide sleeve; because one side of the reducing sleeve has a large diameter and the other side has a small diameter, after drilling pressure is added, the side with large diameter is used as a drilling post supporting point to force the drill bit to drill towards the guiding position of the guider, so the drill bit is directly driven and drilled by a rotating disc without a bent joint and a power drill. The utility model has the advantages of high drilling rate, convenient use, low cost to the drilling wells, etc.

Description

Bit guide

The utility model relates to a kind of drill bit steering tool of geological prospecting directed drilling.

At present, the bit course control that directional well creeps into mainly is to adopt bent sub to add the directed drilling technology of downhole motor (screw rod or worm gear drilling tool), and the following deficiency of this technology ubiquity: the one, power drilling tool rotating speed height, power are little, cause drilling life of bit short, do not add the pressure of the drill, influence drilling speed; Two are to use bent sub and power drilling tool to produce sprain more greatly strength and untwist angle, increase difficulty of construction; The 3rd, power drilling tool cost height, maintenance cost is big, and drill fluid purification is required high long and cost height well construction period that causes.

The purpose of this utility model provides and a kind ofly need not to use bent sub and power drilling tool and can directly drive directional drilling with rotating disk, has easy to use and reliable, cheap bit guide again.

The purpose of this utility model is achieved in that bit guide mainly is made up of top connection, lower contact, core barrel, reducing cover, rudder plate, rudder plate pin, lock pin, ejector pin, spacing ring, bearing, packing, directional bond.The core barrel of a TBE (threaded both ends) links to each other with upper and lower joint, and core barrel is provided with a step-like radial hole, and outer hole is threaded greatly, endoporus has packing groove and packing, the ejector pin and the threaded spacing ring of outer rim of middle band fin are located in the stepped hole, and two of core barrel is provided with outer shoulder, on bearing is arranged.The footpath is big on one side, the little reducing cover in footpath is placed in outside the core barrel on one side in outer garden, respectively there are two interior shoulders at reducing cover two, a bearing place that is positioned on the core barrel, the bearing that supporting links to each other with joint, the axial notch that two symmetries are arranged near the path place in the big footpath of reducing cover one side, the two ends of groove are provided with earrings with holes, two cross sections have the rudder plate of axial hole to place in the groove respectively as funny point-like, big end, connect on earrings by the rudder plate pin, put a radial hole in addition at reducing, packing groove and packing are arranged in the hole, and a lock pin places in the hole.Top connection has the screw thread that is connected with core barrel with drilling rod with the lower contact two ends, and the end that links to each other with core barrel has the packing groove of interior sabot root and the shoulder of block bearing.The directional bond of a band cusped edge also is housed in top connection.

The utility model guider is a kind of cutting fulcrum that forms a constant bearing at the drill bit closest approach, cause the instrument of drill bit by the cutting of design orientation, it need not to use bent sub and power drilling tool, fundamentally eliminated the deficiency of using above-mentioned instrument to bring, but directly drive the drill bit fractured rock with rotating disk, so rate of penetration height, drilling life of bit is long, influences such as no untwist angle, the deflecting and the anti-tiltedly section of directional well are accomplished without any letup, reduced the probability of bearing swing, thereby shortened well construction period, improve the shaft building quality, also reduced drilling cost significantly.

Below in conjunction with accompanying drawing this guider is further described:

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

Fig. 2 is the sectional view of Fig. 1.

This guider is by top connection 12, lower contact 1, core barrel 5, reducing cover 6, rudder plate 15, rudder plate pin 14, lock pin 8, ejector pin 10, spacing ring 11, bearing 3,4, compositions such as directional bond 13 and packing 2,7,9.The core barrel 5 and the top connection 12 of a TBE (threaded both ends), lower contact 1 links to each other, core barrel 5 two are provided with outer shoulder, on rolling bearing 4 is housed, the little step-like radial hole of imperial palace outside on core barrel 5, also having one, there is screw thread in outer hole, endoporus has the packing groove, in sealed packing 9 is housed, two ends are the garden cylindricality, the ejector pin 10 of middle band fin is loaded in the stepped hole, one end is sealed by packing, an outer rim is threaded, the centre has the spacing ring 11 in hole, garden to be inserted in the screw thread that is contained in the hole from ejector pin 10 other ends, and ejector pin 10 is installed its scopes of activities of back: just put down with the outer garden of core barrel 5 to the export trade height, inwardly be lower than the outer garden of core barrel 58 to 10mm.Outside core barrel 5, be with reducing cover 6, reducing cover 6 footpath on one side is big, the footpath is little on one side, be longer than core barrel 5, respectively there are two interior shoulders at two ends, one is positioned at rolling bearing 4 places, a supported Thrust Bearing 3, the axial notch that two symmetries are arranged near the place of path in reducing cover 6 big footpaths one side, two of groove is provided with the earrings in tape spool hole, two cross sections are arranged as funny point-like, big end has the rudder plate 15 of axial hole to place in the groove respectively, and is connected on earrings by rudder plate pin 14, and rudder plate 15 can change an angle around rudder plate pin 14, greater than borehole diameter, be affixed on the reducing cover 6 isometrical during gathering when opening with well.Reducing cover 6 also has a radial hole, the axial location in hole is consistent with the stepped hole that core barrel 5 is installed, its aperture is greater than the internal orifice dimension of stepped hole, be slightly less than spacing ring 11 internal diameters, packing groove and packing 7 are arranged in the hole, the lock pin 8 that size, length and a hole are complementary places in the hole, by packing 7 sealings, and can insert in the spacing ring 11.Top connection 12 has the screw thread that links to each other with core barrel 5 with drilling rod with lower contact 1 two ends, overlap 6 joints with reducing packing groove and the sweet with it packing 2 that seals are arranged, the shoulder that also has a supporting thrust bearing 3 behind the packing groove also has the location of a band cusped edge to be good for 13 12 li of top connections.During installation lock pin 8 is pressed in the spacing ring 11, implements locking, and record positioning key 13 is the angle of guider direct bearing with the neutrality line that reducing overlaps 6 path limits.When this guider is gone into the well since the sectional area of lock pin 8 greater than the sectional area of ejector pin 10 sealed ends, the down-hole head of liquid makes lock pin 8 still keep latched position.It is loaded on drill bit top, with under the drilling tool behind the shaft bottom, measure the orientation of positioning key 13 with the directed inclinometer of single-point, whether the direct bearing of understanding guider is consistent with design directional drilling orientation, perhaps need the angle adjusted, make adjust direct bearing meet creep into the orientation require after turn on pump, because pump pressure is greater than the pump pressure of annular space in the drilling rod, so ejector pin 10 is stressed outwards to eject spacing ring 11 with lock pin 8 and unlocks, pressurize subsequently and rotate drill string, again since the external diameter on the limit, big footpath of reducing cover 6 be similar to drill bit, and little limit than big limit little 12 to 20mm.The big limit of pressurization back reducing cover has become the fulcrum of drill string, forces drill bit to creep into to the direct bearing of guider, meanwhile, because of drill string just changes, rudder plate 15 scrapes the borehole wall and opens and cut the borehole wall, the reducing cover can not be rotated, thereby reach the purpose of deflecting and directional drilling.By regulating the pressure of the drill, change the distance of guider and drill bit or the size that the change reducing overlaps all controlled manufacturing slopes of method such as 6 external diameters.

Claims

1. bit guide, mainly by top connection, lower contact, core barrel, the reducing cover, rudder plate, the rudder plate pin, lock pin, ejector pin, spacing ring, bearing, packing and directed strong the composition, the core barrel (5) and top connection (12) that it is characterized in that a TBE (threaded both ends), lower contact (1) links to each other, core barrel (5) is provided with step-like radial hole, outer hole is big, threaded, endoporus has packing groove and packing (9), the ejector pin (10) and the threaded spacing ring of outer rim (11) of middle band fin are located in the stepped hole, two of core barrel (5) also is provided with outer shoulder, on bearing (4) is arranged, the footpath is big on one side in an outer garden, the little reducing cover (6) in footpath is placed in outside the core barrel (5) on one side, respectively there are two interior shoulders at two, bearing in core barrel (5) (4) is located, another is equipped with bearing (3) respectively, the big footpath of reducing cover (6) one side has the axial notch of two symmetries near the path place, the two ends of groove are provided with earrings with holes, two cross sections are as funny point-like, big end has the rudder plate (15) of axial hole to place in the groove respectively, rudder plate pin (14) connects on earrings, go up a radial hole in addition at reducing cover (6), packing groove and packing (7) are arranged in the hole, one lock pin (8) places in the hole, top connection (12) has the screw thread that links to each other with core barrel 5 with drilling rod respectively with lower contact (1) two ends, the end that links to each other with core barrel (5) has the packing groove of interior sabot root (2) and the shoulder of block bearing (3), and the directional bond (13) of a band cusped edge also is housed in the top connection (12).