CN2116773U

CN2116773U - Split core tube

Info

Publication number: CN2116773U
Application number: CN 92205057
Authority: CN
Inventors: 王辅仁
Original assignee: Taihang Drill Bit Factory Huabei Petroleum Exploration No2 Co
Current assignee: Taihang Drill Bit Factory Huabei Petroleum Exploration No2 Co
Priority date: 1992-03-26
Filing date: 1992-03-26
Publication date: 1992-09-23

Abstract

The utility model relates to a core barrel which is suitable for the technical field of the drilling exploration and is used for the core extraction. The utility model is arranged in a core extracting tool of double-barrel single action, and the utility model is added with a counter-opened type inner core barrel. The lower end of the inner core barrel is provided with a conical surface, the upper end of the inner core barrel is provided with a counter-opened type integral key joint, and the integral key joint is also provided with the conical surface. After a locking nut is screwed tightly, the inner core barrel is in a tension bearing state. The upper surface and the lower surface of the inner core barrel are tightly pressed by the conical surfaces, so the center line of the inner core barrel and the center line of a middle barrel are kept in line. When the diameter of the outer barrels is identical to each other, the core of relatively large diameter can be obtained. When the inner core barrel is adopted, the yield rate of the core can be raised. The utility model has the advantages of simple structure, convenient operation, favorable processing, etc.

Description

Split core tube

The utility model is a kind of drilling technique field that is applied to, the instrument of coring in drilling process.

At present, at home, in outer exploration and the exploitation, generally adopt the coring tool of bitubular single action.When using this instrument to take out core from the core tube, need be sling in core tube upper end, core tube and ground keep certain angle of inclination, shed the core of the card mechanism, and the core in the core tube skids off from the core tube under the effect of deadweight.Adopt the practice of core, occur two unsurmountable problems sometimes.The first, when running into broken core and go out tin, core goes out the tube back and piles up in heapsly, is hard to tell the sequencing of core, distinguishes the layer position that misknows the rock place, researchs and analyses rock sample for the geological work personnel and has brought many troubles.The second, when running into the core that enters the core tube and belong to expansile rock or run into the situation of the core of the card, take out core in the core tube just more difficultly, need sever the core tube, can bring the unnecessary waste and the chemical change of rock sample.In order to address the above problem, the home and abroad has employing that the core tube is manufactured two semicircular cylinders, and two semicircular cylinders snap together dress, forms a circular core tube.It is just more convenient to take out core like this from the core tube.As long as open a semicircular cylinder, the core that enters the core tube is arranged in together in good orderly.Someone improves the core tube, use be above-mentioned core tube.Its complex structure, processing, installation difficulty is big, main shortcoming is that interior core tube bears pressure, under the pressure effect of nut in the core tube deformation can take place, middle center of interior core tube and coring tool can not be consistent.Chinese patent 89219808.7 has disclosed a kind of three single action coring tools, core tube opposite opened coring tool in belonging to.Chinese patent 87202520.U is a kind of coring tool of bitubular single action, and its core tube is also split.

The purpose of this utility model provides a kind of opposite opened core tube, and core tube and middle tube center line are consistent after installing, and the core tube bears pulling force in making, even interior core tube is thinner, can not occur bending and deformation yet, help into core, can improve the core yield rate.

The purpose of this utility model is achieved in that does bigger improvement on the basis of original bitubular single action coring tool (as river 8-3 coring tool).Be provided with one within it in the tube by two semicircle interior core tubes that form that fasten.Former inner core is renamed as middle tube.The lower end of interior core tube has the conical surface, the cone match of the conical surface and lower contact, and the center line of the center line of core tube lower end and middle tube is consistent in can guaranteeing after compressing.Interior core tube upper end is provided with two semicircle lock-on connections that fasten, and the spline tooth of the band conical surface is arranged on the lock-on connection, and there is the spline housing that cooperates with spline tooth the lock-on connection outside, and spline housing is fixed on the middle tube by locking nut.After the repacking, three single action coring tools have been formed.

Interior core tube is after the upper and lower conical surface is compacted, and the center line of the center line of core tube and middle tube is consistent in making, and the core tube bears longitudinal pulling force in making.Urceolus quick rotation when drilling extracting core, middle tube and interior core tube are motionless, and promptly middle tube and interior core tube and core keep relative static conditions, help improving coring recovery rate.

Accompanying drawing is that interior core tube is installed in the vertical section structure figure in the coring tool, also is an embodiment.

Accompanying drawing: 1. the core of the card mechanism, 2. lower contact, 3. tapered sleeve, 4. in the core tube, 5. in tube, 6. top connection, 7. lock-on connection, 8. spline housing, 9. locking nut, 10. urceolus, 11. suspension axle joints, 12. conical surfaces, 13. conical surfaces.

Embodiment 1: there is the conical surface (13) lower contact (2) inside.Tapered sleeve (3) is formed by two semicircle fastenings, and there are one and the corresponding male cone (strobilus masculinus) of lower contact (2) (13) in its lower end, the lower end of core tube (4) in tapered sleeve (3) is welded on, and interior core tube (4) is also formed by two semicircle fastenings.After lower contact (2) and middle tube (5) screw, tapered sleeve (3) and interior core tube (4) lower end are fixed in the lower contact (2) together, and make interior core tube (4) lower end placed in the middle.Lock-on connection (7) be by two semicircle fasten form and be welded in core tube (4) upper end.Spline housing (8) inserts lock-on connection by spline, rotates an angle, makes the cone match of the end of two spline tooths, screws the outside locking nut (9) of spline housing (8), and locking nut (9) is pressed in the upper end of middle tube (5).The lower end of interior core tube (4) is fixing, and after the upper end screwed locking nut (9), core tube (4) bore pulling force in making, and can not produce bending or other deformation under the effect of pressure.The upper/lower terminal of interior core tube (4) all is consistent with the center line of middle tube (5).An opposite opened core tube has just been finished.Install the core of the card mechanism (1) in lower contact (2) bottom, install joint (6) and hang axle joint (11) on middle tube (5) top.Pack at last in the urceolus (10) of coring tool, formed three single action coring tools.

Embodiment 2: interior core tube (4) top is identical with embodiment 1, and difference is that the conical surface (13) on the bottom tapered sleeve (3) just designs in the lower end of interior core tube (4), and promptly tapered sleeve (3) and interior core tube (4) are an integral body.

Embodiment 3: basic identical with embodiment 1, and be that the spline tooth that matches of lock-on connection (7) and spline housing (8) can be made rectangle, involute shape, triangle or fan-shaped.

Claims

1, a kind of core tube, formed by top connection, middle tube, lower contact and two semicircle interior core tubes that form that fasten, it is characterized in that: the lower end of interior core tube is provided with two semicircle conical surfaces that form that fasten, the upper end has two semicircles to fasten the lock-on connection on the core tube in being fixed on of forming, the spline tooth that the band conical surface is arranged on the lock-on connection, there is the spline housing that cooperates with the lock-on connection spline tooth lock-on connection outside, and spline housing is fixed on the middle tube by locking nut.

2, core tube as claimed in claim 1 is characterized in that: two semicircle conical surfaces that form that fasten of the lower end of interior core tube are located on the tapered sleeve, and tapered sleeve also is that two semicircle fastenings form, and tapered sleeve is fixed on the interior core tube.

3, core tube as claimed in claim 1 is characterized in that: two semicircle conical surfaces that form that fasten of interior core tube lower end design on the body of interior core tube.

4, as claim 1,2,3 described core tubes, it is characterized in that: the profile of tooth of the spline tooth of interior core tube upper end locking joint is a rectangle, and the profile of tooth of the spline housing that cooperates with the lock-on connection spline tooth also is a rectangle.

5, as claim 1,2,3 described core tubes, it is characterized in that: the profile of tooth of the spline tooth of interior core tube upper end locking joint is an involute shape, and the profile of tooth of the spline housing that cooperates with the lock-on connection spline tooth also has involute shape.

6, as claim 1,2,3 described core tubes, it is characterized in that: the profile of tooth of the spline tooth of interior core tube upper end locking joint is fan-shaped, and the profile of tooth of the spline housing that cooperates with the lock-on connection spline tooth also is fan-shaped.