US2308147A

US2308147A - Protector for drill pipes

Info

Publication number: US2308147A
Application number: US360913A
Authority: US
Inventors: James C Ballagh
Original assignee: PATTERSON BALLAGH CORP
Current assignee: PATTERSON BALLAGH CORP; PATTERSON-BALLAGH Corp
Priority date: 1940-10-12
Filing date: 1940-10-12
Publication date: 1943-01-12
Anticipated expiration: 1960-01-12

Description

Jan. 12, 1943. J. c. BALLAGH 2,308,147

PROTECTOR FOR DRILL PIPES Filed Oct. 12, 1940 Patented Jan. 12, 1943 UNITED STATES PATENT [OFFICE PROTECTOR FOR DRILL PIPES James O. Ballagh, Los Angeles, Calii'., assignor. to

Patters on-Ballagh Corporation, Los Angeles,

Calii'.,-a corporation oi California Application October-12, 1940, Serial No. 360,913

3 Claims. (01. 308-4) The present invention relates to an improvement in rubber protectors employed upon drilling pipe.

For the protection of drill pipe, such as employed in a rotary system of drilling oil wells,

are to be applied, and they are applied to the drill pipe by being stretched over the same. As the protector sleeves have been constructed in the past, it is found that the drill pipe undergoes considerable wear adjacent the ends of the protectors. This is believed to be due to the fact that the drilling fluid circulated during drilling operations undergoes a swirling action at the ends of the protector sleeves, particularly at the top of the sleeve, with the result that the drilling mud cuts a ring in the drill pipe above the proteetor.

It is a general object of the present invention to provide a protector for drill pipe which will eliminate the destruction of the drill pipe which is attendant through the use of the present forms of protector.

I have found that by providing protector sleeves with extending rings at their ends, which rings have a larger interior diameter than the diameter of the bore 01- the main body of the sleeve.

the cutting of the drill pipe by the mud fluid characterized by the use of the present form or protector sleeves can be substantially entirely eliminated. I have further found that such rings facilitate the installation of the protector ,sleeve on the pipe in that such rings may be employed for holding extra lubricant to be used in installing the rings.

The improved protector sleeve of the present invention will best be understood from a description of a preferred form or example of protector sleeve embodying the present invention. I have, therefore, described the preierrediorm or forms of protector sleeve of the present invention in connection with the accompanying drawing, in which- Figure 1 is an elevation in vertical section 01' one form oi the protector sleeve.

Figure 2 is an elevation in vertical section of the protector sleeve as applied to a drill pipe.

Figure 3 is an elevation in section of a modified form of protector sleeve.

P pe. 7

Referring, first, to Figures 1 and 2.01 the drawing, the protector of the present invention consists of a body 2 which is formed of rubber inaccordance with the usual or preferred practice. The body 2 provides a central bore 3, which is normally of a diameter considerably smaller than the diameter of the drill pipe 4 to which the protector is to be applied. The body 2 or the protector is a cylindrical body, preferably chamfered I at its ends, as indicated at 5 and 6. From the ends of the body protector I extend the annular lips I. The lips I are provided with an interior diameter somewhat larger than the center bore 3 of .the protector to provide the shoulders 8,

which may be employed for lubricant during the act oi installing the protector upon the pipe 4. With the protectors of the form indicated in Figure 1 it is found that when such protectors are stretched over a drill pipe theends of the lips I are curved against the drill pipe in the manner indicated in Figure 2, thereby covering that portion of the drill pipe which in usual practice is cut by the action of the drilling fluid in the well. The lips I of the protector apparently breakup the eddy currents at the ends of the protector, thereby preserving the drill pipe ,4 from deterioration.

Now, referring to Figures 3 and 4, I have shown a somewhat modified form ofprotector in which 8 indicates the cylindrical tector and III the bore. The protector is preferably beveled or chamfered at its ends, as.indicated at H and It. To form the projecting lips indicated at l3 at the end of the proJector,I undercut the ends of the protector as indicated at It. With this form of protector the projecting lips l3 iormed by theundercut l4 function similar in manner to the lips I (previously described. When the protector is stretched over a drill pipe, such as indicated'at ii in Figure 4, the projecting lips l3 are curved into contact with the pipe, providing smooth surfaces at the ends of the protector which function to eliminate any eddy currents.

While the particular forms 01 Protector herein described are well adapted to carry out the objects oi the invention, various modificationsand changes may be made, and this invention isoi I slightly Figure 4 is an elevation in section of the protector sleeve of Figure 3 as applied to a drill body of the pro- I claim:

1. In a rubber protector for drill pipes, 9. cylindrical body member having a central bore of normally smaller inner diameter than the outer diameter of the drill pipe to which the protector is to be applied, and an angular hp at the end of the protector having an inner diameter larger than the inner diameter of the body of the protector, said member being adapted to be stretched over the drill pipe and to provide an elastic force for g pping the member to the drill pipe, said lip adapted to be curved inwardly into contact with the drill pipe through the action 01'- stretching the protector over the drill pipe.

2. A rubber protector for drill pipes,'which protector comprises a cylindrical body having a central bore of smaller inner diameterthan the outer diameter of the pipe to which the protector is to be applied and adapted to be stretched over the pipe and resiliently grip the pipe, an integral portion 01 the protector at at least one end thereof forming a lip having a larger irmer diameter than the innerdiameter otthe body of the protector, said lip being adapted to curve towards the drill pipe as the protector is stretched over the pipe.

3. A rubber protector for drill pipes, consisting of a body part having a central bore of smaller inner diameter than the outer diameter or the pipe to which the same is to be applied, and an undercut at one end of said body forming a lip having a larger interior diameter than the inner diameter of the body 01 the protector and being adapted to curve towards a drill pipe when the body or the protector is stretched over the same,

the body part being adapted to resiliently grip said drill pipe and stretch thereover.

. JAMES C. BALLAGH.