US2268514A

US2268514A - Side wall core taking apparatus

Info

Publication number: US2268514A
Application number: US345628A
Authority: US
Inventors: George T Oberwetter
Original assignee: NELL WEST
Current assignee: NELL WEST
Priority date: 1940-07-15
Filing date: 1940-07-15
Publication date: 1941-12-30
Anticipated expiration: 1958-12-30

Description

Dec.v30, 19441. G; T. oBERwE'r'n-:R

SIDE WALL GORE TAKING PPARATUS Filed July 15, 1940 zsheets-sheet 1 Dak-30, l941 G. T. oBERwET-rER Y SIDE WALL CORE TAKING APPARATUS Filed July 15, 1940 2 Sheets-Sheet 2 3 wu www@ 650265 7.'. BElawrz-EQ 3 lo .5,4 2 3 8 2 22 2 .2 .",Z4U. un 4 4 3 2 6A m 2, w Mw n n f, J 4 wz Patented 30, 1 941 SIDE WAIL'OEE TAKING APPARATUS George T. Oberwetter, Houston, Tex., assignor of two-thirds to Nell West, Harris County, Tex.

' Application July 15, 1940, serial No. 345,628

(ci. zas- 1.4)

, 13 Claims.

This invention relates yto a side wall core taking apparatus.

An object of the invention is 'to provide apparatus of the character described which 'may be lowered through a drill stem and projected out through a guide in the stem and into the formation at the side of the bore and which includes a core receiving barrel to receive and entrap a core, or sample, of the side wall formation, said apparatus being withdrawable through the stem to the ground surface for the recovery and inspection of the core.

It is another object of the invention to. provide a side wall core takingdevice which includes a core receiving barrel and a guide, or shield therefor, said apparatus including means for forcing the core barrel out of the shield and into the formation at the side of the bore being drilled. y l

It is a further object of the invention to provide in apparatus of the character described novel means for driving the core barrel whereby it may be caused to pierce the formation at the side of the bore and form a core of said formation which will enter and be trapped within the core barrel.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, examples of which are given Ain this specification and villustrated in the accompanying drawings, wherein: v

Figure 1 shows a side elevation of the apparatus shown mounted in the stem, a fragmentary view of the latter being shown partly in section.

Figure 2 shows a fragmentary, vertical, sectional view of the drill stem showing a fluid conducting pipe therein for use when the core taking apparatus is removed.

Figure 3 shows a vertical sectional view of a tubular anchor employed showing the cable guide .therein in its upper position.

Figure 4 shows a similarview showing said guide in its lower position. Y

Figure 5 shows a fragmentary, vertical, section- `al view illustrating the core barrel guide or shield Iwith the core barrel therein and the -driving mechanism forthe barrel.-

the same parts in each of the figures, the numeral I designates the drill stem which is made up of sections and which extends to the ground surface.

Incorporated into `the stem the required distance above the drill are the special, relatively thick, upper and lower sections Ia,` Ib to the lower end of the latter of which there is connected a drill collar 2 providing for the attachment of the drill to the stem. Y

The drill stem is tubular throughout and at? one side of the section Ib there is an elongated downwardly flaredslot leading downwardly and outwardly from the passage through the stem. At the lower end of the slot there is a dee'ctor 4 whose upper end is mounted to pivot on the pin 5. A spring 6 is mounted on the pin 5 one arm of which presses against the inside of the section Ib and whose other end engages behind the deflector 4 and normally holds the same in its outward or deiiecting position. A recess 1 is provided within the section Ib to receive the deilector 4 when the latter is in retracted position as shown in Figure 2. The Joints between the sections of the thickened portion of the drill stem may be sealed by annular packing such as 8, 9 and III. y ,A

The numeral I I designates an elongated, sleevelike anchor whose upper end is enlarged forming the head I2 Ywhich tapers downwardly and is seated against and supported by the packing 8 whenthe apparatus is lowered to home position in the stem. The headI I2 has an inside, downwardly facing shoulder I3. l

Telescoped within the anchor II there is a cable guide which is preferably formed of an outside tubular Jacket Il and an inside core I5 preferably formed of insulating material. Electrical conductors I8, I6 extend axially through the cable guide and continue on up to the ground surface. v

The numeral I I designates a barrel guide, or shield, which is tubular in form and which is open at its lower end. Its upper end has a universal connection with the anchor II as shown in Figures 3 to 6, inclusive. This connection is formed by the tubular stem I8 connected tothe upper end of the shield and whose upper end is formed with a ball joint member I9 confined within a socket formed within the glands 20, 2I in the lower end of the anchor II. The conductors I6 extend through said joint connections as shown.-

With the shield I I there is a core-barrel 22 whose lower end may be serrated. if desired,

` as the core enters.

forming a core drill and within said lower end there is a conventional core catcher 23 to retain the core which enters the barrel. The upper end of the barrel has the outlets 24 controlled by the upwardly opening ball valve 25 so as to permit the escape of any foreign matter in the core barrel In the form shown in Figure there is an electro-magnetic hammer embodying the tubular housing 26 within which there are the upper and lower electro-magnets 21,l 26 containing the slidable core 29 and having the upper and

lower anvils

30, 3|. The electrical conductors I6 are connected to the respective electro-magnets and it is contemplated that at the ground surface the conductors I6 will be controlled by an intermitter whereby the electromagnets may be alternately energized and deenergized so as to osclllate the hammer 29 against the anvils. The core barrel is connected to the lower end of the housing 26 so that when the apparatus is lowered into the well as shown in Figure 1 and the cable through which it is lowered released or slacked off, the core barrel and the hammer will be released to the inuence of gravity. The lower end of the shield I1 will engage against the sidewall of the bore as indicated in Figure 1 and the shield will serve as a guide to guide the core barrel into the wall. The operation of the hammer combined with the influence of gravity will cause the core barrel to penetrate the wall of the bore downwardly in a direction alongside the bore but diverging slightly downwardly and outwardly from the bore so as to enter the formation. The core `of the formation' will thus be formed which will enter the core barrel and be entrapped therein. The vibration imparted to the core barrel by the hammer combined with the force of gravity will gradually force the core barrel downwardly but said vibration will prevent it from sticking in the formation so that it cannot be withdrawn.

The operating cable has not been shown but it may be of any conventional type provided with a grapple for engaging over the conical shaped head 32 carried by the upper end of the jacket I4.

In the illustration shown in Figure 6 there is an electric motor 33 located in the housing 26 whose windings are connected with the conductors I6 and which has a driven shaft 34 operatively connected with the corresponding core barrel 22 through the reduction gearing 36 whereby said core barrel may be rotated. `When this form of the apparatus is lowered to home position' in the drill stem a switch at the ground surface may be closed for connecting the conductors I6 with a source of electrical supply whereupon the motor 33 will be driven and the core barrel 22 rotated. As the operating cable is slacked off the motor and core barrel will move downwardly through the guide I'I and the core barrel will penetrate into the formation at the side of the bore forming a core which will enter and be entrapped in the core barrel. In both forms as the core barrel moves downwardly the cable guide I4, I5 will move downwardly with it until said guide lands on the gland 20.

When it is desired to withdraw the core barrel, of either form, the operating cable may be pulled upwardly until the external, annular shoulder 36 on the cable guide engages the shoulder I3 whereupon the entire apparatus may be Withdrawn from the well and drilling proceeded with.

However, before proceeding with drilling a uid vconducting pipe 3ll should be lowered into the drill stem. It will pass through the upper and

lower bearings

8 and 9 and its lower end will force the defiector 4 inwardly or into retracted position as shown in Figure 2 and the lower end of the pipe 31 will ilnally land on the packing I0. The upper end of this pipe 31 has suitable inlets 38 above the packing 8. The drilling uid will therefore be conducted through the pipe 31 and on downwardly through the drill stem and will not pass outwardly through the slot 3.

The drawings and description are illustrative merely, while the broad principle of the invention will be dened by the appended claims.

What I claim is:

1. The combination with a tubular driving member for a well drill having a guideway therein, of a core taking device adapted to be dropped through the driving member and including a tubular shield and a core receiving barrel in the shield, a deflector arranged to deflect said core taking device through the guideway and means for projecting the barrel from the shield into the side wall of a well bore.

2. 'Ihe combination with a tubular driving member for a drill having a guideway, a support in the driving member, a core taking device adapted to be dropped through said driving member and to land on, and be supported by, said support, said core taking device including a movably mounted shield and a core barrel in the shield, a deflector effective to deilect the l shield through said guideway, said core barrel being movable downwardly relative to the shield and being adapted to penetrate into the wall oi a well bore upon such downward movement to entrap a core.

3. The combination with a tubular driving member for a drill having a guideway. a support in the driving member, a core taking device adapted to be dropped through said driving member and to land on, and be supported by, said support, said core taking device including a movably mounted shield and a core barrel in the shield, a deector eiective to deflect the shield through said guideway, said core barrel being movable downwardly relative to the shield and being adapted to penetrate into the wall of a well bore upon such downward movement and to entrap a core and means for withdrawing said core taking device and the entrapped core from the driving member.

4. The combination with a tubular driving` member for a well drill shaped to be lowered into a well and having a guideway and a support above the guideway, of a core taking device shaped to be dropped through the driving member and to land on the support and including a tubular shield and a core barrel within the shield, a deilecwr below the guideway arranged to deflect the core taking device laterally from the driving member through the guideway and means within the shield in operative connection with the core barrel and enective to cause the core barrel to penetrate the formation at the side wallof the bore to form a core within the core barrel.

5. The combination with a tubular driving member for a drill having deilecting means. of a core taking device shaped to drop through the driving member, a support in the driving member arranged to receive and support said core taking device, said core taking device including a movably mounted shield and a core barrel therein arranged to be deiiected by the deiiecting a movably mounted shield and a core barrel therein arranged to be deflected by the deiiecting means into engagement with the side wall of the bore, said core barrel being movable downwardly relative to the shield to penetrate the side wall of the bore and to entrap a sample thereof and means within the shield operatively connected with the core barrel for assisting such further downwardly movement of the-core barrel.

7. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a well bore and having a lateral guideway,

core entrapping means shaped to be dropped through the driving member and to be directed through the guideway into the wall of a bore to form and entrap-a core of the wall formation,

said core entrapping means being withdrawable through the driving member and a tube adapted to close said guideway and to form acontinuation of the liquid conducting conduit through the driving member.

8. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a well bore and having a-lateral guideway, core entrapping means shaped tobe dropped through the driving member and to be directed through the guideway, said core entrapping means including a tubular anchor, a tubular shield`having a pivotal connectionA with the anchor, a core barrel within the shield and movable downwardly relative to the shield to penetrate the side wall of the bore and to entrap a core of the side wall formation.

9. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a well bore and having a lateral guideway,

core entrapping means shaped to be dropped through the driving member and to be directed through the guideway, said core entrapping means includinga tubular anchor, a tubular shield having a pivotal connection with the anchor, a core barrel within the shield and movable downwardly relative to the `shield to penetrate the side wall of the bore and to entrap a core of the side wall formation, means mounted in the anchor for limiting said relative movement of the bore barrel, said means being engageable with the anchor for withdrawing the core taking device.

10. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a well bore and having a lateral guideway.y

core entrapping means shaped to be dropped through the driving member and to be directed through the guideway, said core entrapping means including a tubular anchor, a tubular shield having a pivotal connection with thef anchor, a core barrel within the shield and mov'- able downwardly relative to the shield to penetrate the side Wall of the bore and to entrap a core of the side wall formation, meansmounted in thel anchor. for. limiting said relative movement of the core barrel, said means being engageable with the anchor for withdrawing the core taking device and forming a connection for an operating cable whereby the core taking device may be withdrawn from the driving member.

11. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a'well -bore and having a lateral guideway, core entrapping means shaped to be dropped through the driving member and to be directed through the guideway, said core entrapping means including a tubular anchor, a tubular shield having a pivotal connection with the anchor, a core barrel within the shield and movable downwardly relative to the shield to penetrate the sidewall of the bore and to entrap a core of the side wall formation, means mounted in the anchor fo'r limiting said relative move-- ment of the core barrel, said means being engageable with the 'anchor for withdrawing the core taking device, andan electrically operable means within the shield, operatively connected with the core barrel for assisting the downward movement of the core barrel relative to the shield.

12. A core taking device comprising a tubular driving member for a drill shaped to be lowered into a well bore and having a lateral guideway, core entrapping means shaped to be dropped through the drivingmember and to be directed through the guideway, said core` entrapping .means including a tubular anchor, a tubular shield having a piovtal connection withy the anchor, a core barrel within the shield and movable downwardly relative to the shield to penetrate the side wall of the bore and to entrap a core of the side wall formation and an electrically operable hammer within the shield operatively connected with thecorebarrel for assisting the downward movement of the core barrel relative to the shield.

13. A core `takingdevicecomprising a tubular driving member for. a drill shaped to be lowered into a well bore and having a lateral guideway, core. entrapping means shaped to be dropped through the driving member and to be directed core'of the side wall formation and an'electrically driven motor within the shield geared to the core barrel for rotating the same upon said downward movement of the-core barrel relative to the shield.

` GEORGE T. OBERWETTER.