Threaded connector for well servicing applications

Abstract

A threaded connection assembly comprises a nut, a multiplier connected to the nut via a first threaded interface having a first number of threads per inch and a well servicing pipe coupling connected to the multiplier via a second threaded interface having a second number of threads per inch. A method of forming a threaded connection for a well servicing application comprises forming a pipe coupling between two well servicing pipe sections and threading a connector to the pipe coupling to form a threaded connection without impact loading the connector. Another method for forming a threaded connection comprises disposing a first pipe section partially within a nut, threading a multiplier into the nut, threading the multiplier onto a second pipe section, and leveraging the multiplier against the nut, or vice versa.

1 . A threaded connection assembly comprising: 
 a nut;    a multiplier connected to the nut via a first threaded interface having a first number of threads per inch (first TPI); and    a well servicing pipe coupling connected to the multiplier via a second threaded interface having a second number of threads per inch (second TPI).    
   
   
       2 . The threaded connection assembly of  claim 1  wherein the first TPI is less than the second TPI.  
   
   
       3 . The threaded connection assembly of  claim 1  wherein an equivalent TPI between the nut and the well servicing pipe coupling is negative.  
   
   
       4 . The threaded connection assembly of  claim 1  wherein the first threaded interface and the second threaded interface are at least partially formed simultaneously.  
   
   
       5 . The threaded connection assembly of  claim 1  wherein the nut connects to the well servicing pipe coupling via a non-threaded connection.  
   
   
       6 . The threaded connection assembly of  claim 1  wherein the nut and the multiplier rotate in opposite directions to form the second threaded interface.  
   
   
       7 . The threaded connection assembly of  claim 6  further comprising a torque tool that simultaneously imparts a rotational force to the nut and an opposite rotational force to the multiplier.  
   
   
       8 . The threaded connection assembly of  claim 7  wherein the torque tool simultaneously engages a hole in the nut and a hole in the multiplier.  
   
   
       9 . The threaded connection assembly of  claim 7  wherein the torque tool simultaneously engages a spline on the nut and a hole in the multiplier, or vice versa.  
   
   
       10 . The threaded connection assembly of  claim 7  wherein the torque tool simultaneously engages a spline on the nut and a spline on the multiplier.  
   
   
       11 . The threaded connection assembly of  claim 7  wherein the torque tool comprises a mechanical tool, a hydraulic tool, a pneumatic tool, an electrical tool, or a combination thereof.  
   
   
       12 . The threaded connection assembly of  claim 1  wherein the well servicing pipe coupling comprises: a pin-end pipe section disposed partially within a box-end pipe section with a face seal provided therebetween.  
   
   
       13 . A method of forming a threaded connection for a well servicing application comprising: 
 forming a pipe coupling between two well servicing pipe sections; and    threading a connector to the pipe coupling to form a threaded connection without impact loading the connector.    
   
   
       14 . The method of  claim 13  further comprising: 
 preloading the threaded connection without impact loading the connector; and    performing the well servicing application;    wherein the preloading prevents a seal in the pipe coupling from extruding during the well servicing application.    
   
   
       15 . The method of  claim 13  wherein threading the connector to the pipe coupling comprises leveraging a portion of the connector against another portion of the connector.  
   
   
       16 . The method of  claim 14  wherein preloading the threaded connection comprises imparting a rotational force to a first portion of the connector and simultaneously imparting an opposite rotational force to a second portion of the connector.  
   
   
       17 . The method of  claim 14  wherein the well servicing application comprises fracturing, stimulating or cementing.  
   
   
       18 . A method of forming a threaded connection for a well servicing application comprising: 
 disposing a first pipe section partially within a nut;    threading a multiplier into the nut;    threading the multiplier onto a second pipe section; and    leveraging the multiplier against the nut, or vice versa.    
   
   
       19 . The method of  claim 18  further comprising attaching the nut to the first pipe section via a non-threaded connection.  
   
   
       20 . The method of  claim 18  further comprising simultaneously imparting opposite rotational forces to the multiplier and the nut to tighten the threaded connection.  
   
   
       21 . The method of  claim 20  wherein the rotational forces are imparted mechanically, hydraulically, pneumatically, electrically, or a combination thereof.  
   
   
       22 . The method of  claim 18  further comprising: 
 providing a face seal between the first pipe section and the second pipe section;    tightening the threaded connection to provide a sufficient preload to prevent the face seal from extruding during the well servicing application.    
   
   
       23 . The method of  claim 22  further comprising performing the well servicing application.