Mule shoe with internal flow control

Abstract

A mule shoe or UBHO sub with internal flow control is provided. The device has a fluid flow controlling interior surface feature which produces a predictable fluid flow. Specifically, the device, which is an elongated hollow cylinder, has internal “rifling” to produce a swirling flow pattern within the device. This flow pattern reduces turbulence within the sub, and prevents washing out of the pin during heavy fluid flow.

I claim: 
     
         1 . A mule shoe for connection to a tool string in a drilling operation comprising:
 an elongated hollow cylindrical main body having opposing ends;   said main body having exterior and interior surfaces, said interior surface having a series of lands and grooves extending lengthwise;   whereby fluid flow through said mule shoe is affected by said land and grooves.   
     
     
         2 . A device for connection to a tool string in a drilling operation comprising:
 an elongated hollow cylindrical main body having opposing ends;   said main body having exterior and interior surfaces, said interior surface having a series of lands and grooves extending lengthwise;   whereby fluid flow through said mule shoe is affected by said land and grooves.