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US 4,175,619 AGranted
Well collar or shoe and cementing/drilling process
OwnerCarl A. Davisinventor
Life of this patent
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OwnerCarl A. Davisinventor
Estimating the term…
An improved well shoe or collar has at least one tooth protruding from the top of the cement shoulder of the shoe or collar capable of engaging, denting and penetrating a pump down wipe plug and retarding the tendency of the plug to rotate when engaged by a drilling bit, thereby enhancing the drilling action of a drill bit on a pump down wipe plug. An improved process of cementing within a well and drilling through a plug comprises inserting a pump down wipe plug at the interface of a fluid and wet cement, pumping the plug down the well until it comes into contact with a shoulder of a shoe or collar having at least one protrusion extending from the surface of the shoulder capable of engaging, denting and penetrating the plug, subsequently after the cement has set, lowering a drill bit onto the top of the plug, the protrusion retarding the tendency of the plug to rotate with the rotating action of the drill bit and enhancing the drilling action of the bit.
In a well shoe or collar pipe attachment having a cement tube adapted to receive a pump down wipe plug, the improvement which consists of at least one drillable protrusion extending upward from the top surface of the cement tube, said protrusion having a sharp upper end capable of engaging, denting, penetrating and rending a pump down wipe plug and strong enough to withstand the torque exerted by the tendency of a pump down wipe plug to rotate when in contact with a rotating drill bit.
In a well shoe or collar pipe attachment having a cement tube adapted to receive a pump down wipe plug, the improvement which consist of from 3 to 6 pointed aluminum teeth extending at least 1.27 centimeters above the top surface of cement tube, said teeth being part of a rod between about 4 and about 30 centimeters long which extends into the top surface and are fixed in the cement tube so that the teeth are capable of engaging, denting, penetrating and rending a pump down wipe plug, thereby retarding the tendency of the plug to rotate when engaged by a rotating drilling bit, enhancing the drilling action of the bit on the plug.
An improved well cementing and drilling process comprising:
An improved well cementing and drilling process comprising:
Dependencies are inferred from the claim text.