Device that undergoes a change in specific gravity due to release of a weight

Abstract

A method of performing an operation in a wellbore using a device, the method comprises: introducing the device into the wellbore, wherein the device initially comprises a body and a weight; causing or allowing the weight to become disassociated from the body, wherein after disassociation, the device comprises the body, and wherein the specific gravity of the device decreases after the weight becomes disassociated from the body; and causing or allowing at least the body to move towards a wellhead of the wellbore after the weight is disassociated from the body.

What is claimed is: 
     
         1 . A method of performing an operation in a wellbore using a device, the method comprising:
 introducing the device into the wellbore, wherein the device initially comprises a body and a weight;   causing or allowing the weight to become disassociated from the body, wherein after disassociation, the device comprises the body, and wherein the specific gravity of the device decreases after the weight becomes disassociated from the body; and   causing or allowing at least the body to move towards a wellhead of the wellbore after the weight is disassociated from the body.   
     
     
         2 . The method according to  claim 1 , wherein the device is a tool. 
     
     
         3 . The method according to  claim 1 , wherein the device is an isolation device. 
     
     
         4 . The method according to  claim 1 , wherein the device is an information communications device. 
     
     
         5 . The method according to  claim 4 , wherein the information communication device communicates a command to a downhole tool. 
     
     
         6 . The method according to  claim 4 , wherein the information communications device communicates information about a downhole parameter to the surface of the wellbore. 
     
     
         7 . The method according to  claim 6 , wherein the information communications device further comprises one or more sensors located in the body of the device. 
     
     
         8 . The method according to  claim 6 , wherein the information communications device further comprises a receiver for receiving information from one or more downhole sensors, wherein the receiver is located in the body of the device. 
     
     
         9 . The method according to  claim 1 , wherein the body comprises a first material. 
     
     
         10 . The method according to  claim 9 , wherein the first material is a solid. 
     
     
         11 . The method according to  claim 9 , wherein the first material is a liquid, a gas, or combinations thereof, and wherein the body further comprises an enclosure for the first material. 
     
     
         12 . The method according to  claim 1 , wherein the body has a specific gravity substantially similar to or less than the specific gravity of a fluid located in the wellbore. 
     
     
         13 . The method according to  claim 1 , wherein the body has a specific gravity less than 1.1 at a temperature of 71° F. and a pressure of 1 atmosphere. 
     
     
         14 . The method according to  claim 1 , wherein the body is connected to the weight during introduction of the device into the wellbore. 
     
     
         15 . The method according to  claim 1 , wherein the substance the weight is made from has a specific gravity of at least 3 at a temperature of 71° F. and a pressure of 1 atmosphere. 
     
     
         16 . The method according to  claim 1 , wherein the weight is made from a degradable substance. 
     
     
         17 . The method according to  claim 16 , wherein the weight is directly connected to the body. 
     
     
         18 . The method according to  claim 1 , wherein the weight is indirectly connected to the body via a tether or a connector, and wherein the weight is made from a non-degradable substance. 
     
     
         19 . The method according to  claim 18 , wherein the tether or connector is made from a degradable substance. 
     
     
         20 . A system for performing an operation in a wellbore using a device, the system comprising:
 the device, wherein the device initially comprises a body and a weight; and   the wellbore;   wherein the device is located within the wellbore, wherein initially the body is directly or operatively connected to the weight, wherein the device comprises the body after the weight becomes disconnected from the body, and wherein the specific gravity of the device decreases after the weight becomes disconnected from the body.