CN2389232Y

CN2389232Y - Joint attached to drill

Info

Publication number: CN2389232Y
Application number: CN 99232559
Authority: CN
Inventors: 周维远
Original assignee: SICHUAN NORTH-WEST OIL FIELD OF SICHUAN PETROLEUM ADMINISTRATION
Current assignee: SICHUAN NORTH-WEST OIL FIELD OF SICHUAN PETROLEUM ADMINISTRATION
Priority date: 1999-09-08
Filing date: 1999-09-08
Publication date: 2000-07-26
Anticipated expiration: 2009-09-08

Abstract

The utility model relates to a safety joint attached to a drill, which belongs to the technical field of subsurface tools in the drilling operation of petroleum geology, and the safety joint is composed of an upper joint, a lower joint and a center sliding sleeve, wherein crescent-shaped key grooves are arranged on inner hole bodies of the upper joint and the lower joint, crescent-shaped keys are arranged at the outer part of a center sliding sleeve body, and the center sliding sleeve is arranged in the inner holes of the upper joint and the lower joint and are locked by the crescent-shaped keys. The utility model changes the operation mode of unclamping of the prior art that when the accident of clamping a drill occurs, the drill can be unclamped by unclamping in explosion, connecting safety joints and reversely clamping a drilling tool. When the utility model is in the state of clamping the drill, only a steel ball is thrown into the drilling tool and the drilling tool at the upper part can be lifted out in a reverse clamping mode by that the center sliding sleeve is pressed and extruded by a pump. The utility model has the advantages of safety, rapidity, simple structure and convenient operation of unclamping.

Description

With boring safety joint

A kind ofly novelly be used for oil, geological drilling operation, belong to the downhole tool technical field in oil, the geological drilling with boring safety joint.

At present, after in drilling operation lock of tool drilling taking place, generally all adopt breakouting pack of dynamite, connect safety joint, propose the drilling tool that blocked with the left-hand screw drill pipe back-off operation, the shortcoming of prior art is: in case bit freezing, to take out the instrument required time that is blocked longer, and it is long so just to have caused the drill bit that blocked or drilling tool to stop in the down-hole, causes the borehole wall to collapse making down-hole accident complicated easilier, thereby drilling period is prolonged, and drilling cost increases.

The purpose of this utility model be exactly for overcome that the oversize situation of above-mentioned processing down-hole accident required time designs with boring safety joint, when bit freezing takes place, need not pull out of hole, as long as, can reach the purpose of unfreezing by dropping into a steel ball in drilling rod.

The utility model is achieved in that this is made up of ectosome and endosome with boring safety joint, ectosome comprises the positive and negative snapping head in top, the positive and negative snapping head in bottom, endosome comprises the center sliding sleeve, the positive and negative snapping head of positive and negative snapping head in top and bottom is connected as one with screw thread, the center sliding sleeve that has a Woodruff key pack into be milled with the selenodont self-locking grooves on, in the positive and negative snapping head in bottom, when bit freezing takes place, in drilling rod, drop into a steel ball by well head, the turn on pump pressurization, owing to the external diameter of steel ball size less than the center sliding sleeve, therefore, under pressure, steel ball can be released the center sliding sleeve, the positive and negative snapping head in bottom, so just realized release, as long as back-off makes, positive and negative snapping head separately can propose drilling tool down, reach the purpose of unfreezing, the utility model has the advantages that: can be when lock of tool drilling takes place be issued to the purpose of release in pump pressure, can in time take out the above drilling tool of this joint, avoid in the prior art repeatedly drilling tool to switch operation and the time that brings and the increase of expense by steel ball.

Fig. 1 is a section assembling drawing of the present utility model.

Fig. 2 is the drawing in side sectional elevation at A-A place among the utility model Fig. 1.

Provide enforcement of the present utility model below in conjunction with accompanying drawing: the utility model is by constituting with boring safety joint ectosome and endosome, ectosome comprises a positive and negative snapping head 1 in top, the positive and negative snapping head 5 in bottom and a center sliding sleeve 4 that constitutes endosome, the positive and negative snapping head 5 of positive and negative snapping head 1 in top and bottom by screwed connection as a whole after, boring is vertically gone up in the hole within it has selenodont to be good for groove, on center sliding sleeve 4 bodies selenodont key 8 is arranged, the amplitude of selenodont key 8 can be from 20 ° to 90 °, on the ectosome of the positive and negative snapping head 5 in bottom, be provided with location level pressure pin 7, the upper end of center sliding sleeve 4 is designed to 30 ° of ball-type seat surfaces, during installation, earlier the positive and negative snapping head in positive and negative snapping head 1 in top and bottom 5 is connected by screw thread, bore the selenodont keyway on the hole within it then, just constituted ectosome of the present utility model, the endosome center sliding sleeve 4 that has selenodont key 8 on the body is clamp-oned the endoporus with the brill safety joint of the good selenodont keyway of boring, installing location level pressure pin 7 just constitutes with boring safety joint, in normal drilling process, it is connected on centralizer or the drill bit, when the generation lock of tool drilling is wanted release, at first stop to bore, termination of pumping, unload the above instrument of back pressure valve, in drilling tool, drop into steel ball then, connect water tap again, turn on pump is exerted pressure to steel ball, because steel ball size is less than the external diameter of center sliding sleeve 4, so, promoting center sliding sleeve 4 under pump power moves down, make the crescent moon keyway in the positive and negative snapping head 5 of selenodont key disengaging positive and negative snapping head 1 in top and bottom on the center sliding sleeve 4, cut off location level pressure pin 7 simultaneously to reach the purpose of release, starting the rig back-off then separates positive and negative snapping head 1 in top and the positive and negative snapping head 5 in bottom, just can reach at last the safe purpose that trips out drilling tool, 3 are arranged on the sealing ring on center sliding sleeve 4 tops, and 6 are arranged on the sealing ring on the positive and negative snapping head inwall of bottom.

Claims

1. one kind with boring safety joint, is made of ectosome and endosome, it is characterized in that:

A. described ectosome comprises a positive and negative snapping head in top and the positive and negative snapping head in bottom, the positive and negative snapping head in upper and lower part is by screwed connection, its button-type is positive left-hand thread button-type, boring has selenodont to be good for groove on the endoporus of the positive and negative snapping head in top and the bottom, and the ectosome of the positive and negative snapping head in bottom is provided with location level pressure pin;

B. described endosome comprises that a basic external body is provided with the center sliding sleeve of Woodruff key, and the Woodruff key of center sliding sleeve body exterior can be 20 °～90 °, and the top of center sliding sleeve is one 30 ° ball seat face.