CN2053237U

CN2053237U - Core extractor

Info

Publication number: CN2053237U
Application number: CN 88218794
Authority: CN
Inventors: 陈鼎元; 吴尚利; 杨明金; 邓芬兰
Original assignee: Drilling And Production Technology Research Institute Of Sichuan Petroleum Administration
Current assignee: Drilling And Production Technology Research Institute Of Sichuan Petroleum Administration
Priority date: 1988-07-01
Filing date: 1988-07-01
Publication date: 1990-02-21

Abstract

The utility model discloses a native-state core extracting device in the process of the well drilling. The core extractor comprises a safety joint, a rotating joint, a liquid stoping valve, a stabilizer, an external cylinder, an inner cylinder, a liner, a core catcher and a coring bit. A clip guiding mechanism is added in the core catcher, between the rotating joint and the inner cylinder, a gap regulating mechanism is installed. Therefore, when the core with an irregular end surface enters into the clip, can not cause the clip to excessively diverge to damage, and fragmentary debris can not fall in the gap of the clip and a clip seat to block the clip to move. The adjustment of gap between the lower end surface and the shoulder of an inner inclined surface of the coring bit is easier than the original coring tool, and the adjustment range is also increased.

Description

Core extractor

The utility model relates to the device that extracts native-state core in a kind of drilling process, and it comprises following several architectural feature: safety joint, swivel joint, flow-stop valve, stabilizer, urceolus, inner core, bushing pipe, core grabber and core bit.

In prior art, coring tool generally is made up of safety joint, swivel joint, flow-stop valve, stabilizer, urceolus, inner core, bushing pipe, core grabber and core bit.Weak point is that rock core has just formed and when entering clip, if the rock core end face is irregular, clip may be monolateral stressed, after moving on the rock core, because the gap between clip and the clip seat increases, clip is past to be departed from Yi Bian make, then the another side of clip may be headed in the coupling sleeve by rock core, thereby cause clip distortion and damage, another weak point is that fragmentary debris is fallen in the gap between clip and the clip seat easily, clip is moved be obstructed.The 3rd weak point is, because rigging error, the gap in core grabber lower surface and the core bit between the inclined-plane shoulder does not often meet the requirements, and must adjust.But whole inner core composite member to be taken out, adjust the thickness of the adjustable ring on the core grabber.Like this, every adjustment is once all cumbersome, and adjustable range is also smaller.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art and a kind of improved coring tool is provided.The clip of this coring tool is not fragile, moves and can not be obstructed, and the gap of adjusting between the interior inclined-plane of core grabber lower surface and the core bit shoulder is more convenient, and adjustable range is also bigger.

The purpose of this utility model can reach by following measure: a kind of coring tool, its upper end is by a safety joint of mainly being made up of inner core suspension joint, urceolus suspension joint and drag ring.The mode that the lower end of described urceolus suspension joint intermeshes by " stabilizer---urceolus---stabilizer " is connected with n stabilizer and reaches (n-1) root urceolus, and is connected with a core bit in the lower end of lower stabiliser.The lower end of described inner core suspension joint is connected with a swivel joint, several inner core and a core grabber in turn.In addition, the flow-stop valve of being made up of valve seat and steel ball is connected the lower end of swivel joint.Several bushing pipes are contained in the inner core the inside.Described swivel joint mainly is made up of flag nut, bearing box, bearing and suspension axle.Described core grabber is made up of coupling sleeve, clip seat and clip.Its special character is to have the clip guiding mechanism in the core grabber.Between swivel joint and the inner core gap adjusting mechanism is installed.

The purpose of this utility model can also reach by following measure: the clip guiding mechanism in the core grabber has one by coupling sleeve and the formed annular space of clip seat, and the conical sleeve of clip upper end is positioned at annular space, can inside move up and down.

The purpose of this utility model can also reach by following measure: have one to be connected the adjusting nut that hangs between axle and the inner core in the gap adjusting mechanism.There is the projection of one " L " shape at the lower surface of brake hoop and endoporus place, embed interior the reaching in the cannelure that hangs the axle lower end of radial slot of adjusting nut upper end respectively.Then, push down brake hoop with locking nut again.

The utility model has following advantage compared to existing technology:

1. because core grabber has the clip guiding mechanism, the irregular rock core of end face can not make clip excessively depart from and damage.

2. because clip upper end has conical sleeve, fragmentary debris can not fall into and in the gap between clip and the clip seat clip be moved to be obstructed.

3. owing to have gap adjusting mechanism, the gap of adjusting between the interior inclined-plane of core grabber lower surface and the core bit shoulder is more convenient, and adjustable range is also bigger.

The drawing of accompanying drawing is described as follows:

Fig. 1 is vertical half sectional view of the utility model first half.

Fig. 2 is vertical half sectional view of the utility model Lower Half.

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

There is a safety joint coring tool upper end shown in the figure, in the described safety joint, urceolus suspension joint (6) is used the outside that is threaded in inner core suspension joint (1), and drag ring (2) is installed between two taper seats of inner core suspension joint (1) and urceolus suspension joint (6).Be processed with serrated teeth on two taper seats of drag ring (2), the friction factor of two flank of tooth on the dextrorotation direction is bigger, friction factor in left hand direction is less, on the outer garden cylinder of inner core suspension joint (1) three small sircle holes uniform on circumference are arranged, compression spring (4) and pin (3) all are housed in each small sircle hole, under the effect of compression spring (4), an end of pin (3) puts in the interior cannelure of drag ring (2).Sealing ring (5) and sealing ring (7) are installed in respectively in two seal grooves of inner core suspension joint (1), and contact with the inner surface of urceolus suspension joint (6).The lower end of described urceolus suspension joint (6) is connected with three stabilizers (19) and two urceolus (20) by the mode that " stabilizer---urceolus---stabilizer " intermeshes, and a core bit (26) is connected the lower end of lower stabiliser (19).The lower end of described inner core suspension joint (1) is successively with the swivel joint that has been threaded, gap adjusting mechanism, two inner cores (21) and a core grabber.In the described swivel joint, the lower end that is threaded in inner core suspension joint (1) is used in the upper end of bearing box (11), single direction thrust ball bearing (12) in the bearing box (11) is contained in the outside that hangs axle (13), flag nut (10), brake hoop (9) and locking nut (8) are contained in the upper end that hangs axle (13) successively, and make flag nut (10) hang over single direction thrust ball bearing (12) above.There is a usefulness to be threaded in the described gap adjusting mechanism and hangs the adjusting nut (18) of axle (13) lower end and inner core (21) upper end, there is the projection of one " L " shape at the lower surface of brake hoop (17) and endoporus place, embed interior the reaching in the cannelure that hangs axle (13) lower end of radial slot of adjusting nut (18) upper end respectively, then, use locking nut (16) to push down brake hoop (17) again.During gap in needs are regulated core grabber lower surface and core bit (26) between the inclined-plane shoulder, locking nut (16) can be unclamped, brake hoop (17) is up moved, make the radial slot of projection disengaging adjusting nut (18) upper end of brake hoop (17) lower surface, rotate adjusting nut (18) then, driving the inner core (21) and the core grabber that connect thereon moves up and down, after treating that critical field is transferred in the gap, brake hoop (17) moves down, the projection of its lower surface is embedded in the radial slot of adjusting nut (18) upper end again, tighten locking nut (16) again.In the described core grabber, clip seat (24) is used the lower end that is threaded in coupling sleeve (23), and clip (25) is positioned on the internal conical surface of clip seat (24), can move up and down.Simultaneously, also have the clip guiding mechanism in the core grabber, by coupling sleeve (23) and the formed annular space of clip seat (24), and the conical sleeve of the clip (25) that can move in annular space upper end constitutes.Carry drilling tool on core-drilling stops, and only needs slightly, clip (25) will be slided on the internal conical surface of clip seat (24), and the rock core root is tightly blocked, and puts off from the rock core root at last.In addition, the flow-stop valve of being made up of valve seat (15) and steel ball (14) is connected on the internal thread that hangs axle (13) lower end.When well-flushing finishes, core-drilling begins, steel ball (14) from the well head input, is located on the internal conical surface of valve seat (15), stop mud to flow to inner core (21), thereby the protection rock core is not damaged.Two bushing pipes (22) are contained in the inside of inner core (21), and the shoulder in coupled covers in two ends (23) and the adjusting nut (18) blocks, and this bushing pipe is made with glass fiber reinforced plastic, is removed with rock core, make rock core be convenient to keeping and transportation.

Claims

1, a kind of coring tool, its upper end has one mainly by inner core suspension joint (1), the safety joint that urceolus suspension joint (6) and drag ring (2) are formed, the mode that the lower end of described urceolus suspension joint (6) intermeshes by " stabilizer--urceolus--stabilizer " is connected with n stabilizer (19) and reaches (n-1) root urceolus (20), and be connected with a core bit (26) in the lower end of lower stabiliser (19), the lower end of described inner core suspension joint (1) is connected with a swivel joint in turn, several inner cores (21) and a core grabber, in addition, the flow-stop valve of being made up of valve seat (15) and steel ball (14) is connected the lower end of swivel joint, several bushing pipes (22) are contained in the inside of inner core (21), and described swivel joint is mainly by flag nut (10), bearing box (11), bearing (12) and suspension axle (13) are formed.Described core grabber is made up of coupling sleeve (23), clip seat (24) and clip (25), it is characterized in that having the clip guiding mechanism in the core grabber, and swivel joint and inner core are equipped with gap adjusting mechanism between (21).

2, coring tool according to claim 1, the clip guiding mechanism that it is characterized in that core grabber is by coupling sleeve (23) and the formed annular space of clip seat (24), and the conical sleeve of the clip (25) that can move in annular space upper end constitutes.

3, coring tool according to claim 1 and 2, it is characterized in that having in the gap adjusting mechanism one and be connected the adjusting nut (18) that hangs between axle (13) and the inner core (21), there is the projection of one " L " shape at the lower surface of brake hoop (17) and endoporus place, embed interior the reaching in the cannelure that hangs axle (13) lower end of radial slot of adjusting nut (18) upper end respectively, then, use locking nut (16) to push down brake hoop (17) again.