US2479394A - Oil well implement - Google Patents

Description

1949- J. s. MONTGOMERY 7 2.4799394 OIL WELL IMPLEMENT Filed Aug. 24, 1944 V Liquid mu burr/e.

INVENTOR- I3 Jesse S. Monfaomery Atti a Patented Aug. 16, 1949 on. WELL IMPLEMENT, Jesse s. Montgomery, Oklahoma City, Okla, as-

ra on of ne aw ,signontmlhillipsBetroleumflompanwa corpo-r iApplication August 24, 19,44, Serial Nor=55lL9A7 This invention relat t :a m m em m; 9 1.1

specifically adapted for use insqueeeze'cementing a well bore :for the purpose of proyiding a guide hole for tools subsequently used after the well is cemented.

In accordance withthis invention 1a tubular housing or container of suitable 'length and pref 'erably made'of some easily drillable material is filled with a 'fiuid-suchas water andrun 1 .1011 *t'n'e bottom-of acement retainer or packer. This housing is; provided with -means ;for centering it in the hole prior tosqueezecementingthe hole and is constructedso "as to permit the 1-fqrcing of fluid cement into the bore and a-round the hous- The implement is provided for the purpose of furnishing a center hole through the cement body in a well bore which has been squeeze cemented for any of the many reasons for which squeeze V cementing is used today. The implement is in the form of a tubular body which provides a hole after cementing serving as a guide for all later used tools such as rotary and cable tools used in drilling cement.

In accordance with the present practice, there is no satisfactory method of preventing drill bits from drilling into the side of the well bore and into the formation after squeeze cementing. The implement herein disclosed will prevent the failure of the squeeze cement job due to the bit not remaining in the old well bore but starting a new hole by passing the cement.

A further object of the invention is to provide an implement of this type made of material which may be easily drilled or cut away and which is, therefore, so constructed that pressure therein. is equalized during squeeze cementing so as not to fracture the implement during cementing.

Other and more detailed objects of, the invention will be apparent from the following detailed disclosure of one embodiment thereof.

This invention resides substantially in the combination, construction, arrangement and relative location of parts all as hereinafter described.

In the accompanying drawings, the single figure is a vertical, central, cross-sectional view through the implement of this invention showing it lodged in a well bore.

As illustrated, the implement is run into the oil string or well casing II On the bottom of which is a cement retainer or packer I of any suitable and well known construction and is attached thereto by an adaptor or coupling device 2. This coupling device is attached to the packer by 4 Claims. (curse-1 it l ow end a hou h provided withe ser e n p r o a ons 1.8 in the QQY the q Th Jew-.61 .en of th a aptor isattached'b a hr a .001 .f nectio'nill toanotherperforated-coupler 3. The 'c oupler 3 ,is attachedbya threaded connection ID to a tubular housing or casing 4 which ,is

closed at its lower end bymeans ofracap ,6 attached thereto by the threaded connection 1.3. Mounted on the sides of the tubular housing '4 ea t lower end t reof area seriesn u d s 5 i of any, suitable ,cOnstructi n ,and preferably of re n material i uf c en external d am ter to center the lower end of the casing j lin the wellbore. The paclger'isprovided with atubular passage 'Ttherethrough terminating at'its upper end in threads 8 by means of which it may be attached to a tubing or drill pipe (not shown) for lowering into position.

The adapter 2, coupler 3, the tube 4, the guides 5, and the cap Ii are made of some material which may be easily drilled and preferably are made of some suitable composition material such as a thermosetting plastic, synthetic resin, or the like.

When the implement is to be in use it is first filled full of some fluid such as water through the holes in the coupling device 3 and then lowered into position in the well bore which it will retain by reason of the frictional engagement of the packer I with the oil string I I and the resilient guides 5 with the well bore. Of course, if the area to be cemented is at the bottom of the bore hole, the implement will rest on that bottom. Liquid cement C is then passed through the tub ing or drill pipe and through the tube 1 into the coupler 2, and from there through the holes I8 into the bore around the implement. The cement flows down around the implement to the bottom of the hole and when pressure is applied to the top of the body of the cement in accordance with common practice, it will be forced into the wall of the bore opposite the implement. The fluid within the implement is equalized in pressure through ports I4 so that there is no danger of the fracture thereof even when it is made of relatively weak materials. The guides 5 center the housing 4 in the bore and hold it in position during the cementing operation. When cementing is complete the tubing or drill pipe is detached from the packer I and removed from the casing II. It will be apparent that after the cement is set and tools are sent down, such as rotary or cable tools for drilling the cement plug at the bottom of the bore, they will have little or no a threaded connection as shown and is closed at tendency to break through the squeeze cement in formation but will be guided to the bottom of the cemented area to begin work properly centered in the bore hole. The tool will easily drill out the composition or other material of the packer I, adapter 2, coupling 3, housing 4, guides 5 and cap 6.

From the above description it will be apparent to those skilled in the art that the subject matter of this invention is capable of some variation without departure from the novel subject matter thereof. I prefer, therefore, to be limited by the claims rather than by the illustrative disclosure.

What is claimed is: i

1. An oil well squeeze cementing tool comprising in combination a tubing, a packer on said tubing disposed to pack off between said tubin and the well bore, and a septum attached to said tubing below said packer, said septum being frangible under the pressures of squeeze cement- .ing and said tubing having perforations therein between said packer and said septum through which cement'gmay be discharged into the well bore below said packer, the lower end of said tubing being closed. to form a, liquid containing space, said tubing having perforations therein between said septum and the closed lower end of said tubing for equalization of hydrostatic pressure on the septum.

2." An "oil well squeeze cementing tool of the type described comprising in combination a tubing closed at the lower end and having a plurality of perforations adjacent the closed end through which liquid cement may be discharged,

a tubular container closed at the lower end and attached at its upper end to the closed end 01' said tubing, said container being collapsible under the pressures of squeeze cementing, the upper end of said container having perforations, a fluid filling for said container for balancing hydrostatic pressures applied to the exterior thereof, and means on, said container for center: ing itinawell bore. l

3. In the combination of claim 2 said pipe string being closed at its lower end by a perforated cap to which said container is attached.

4. In-the combination of claim 2, said pipe string being closed .at its lower end by a perforated cap and said container being closed at its upperend by a perforated coupling member detachably secured to said cap.

. 4 JESSE S. MONTGOMERY.

REFERENCES CITED UNITED STATES PATENTS 2,373,005 Baker -Q. Apr. 3,

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