Method for intercepting and connecting underground formations and method for producing and/or injecting hydrocarbons through connecting underground formations

Abstract

The present invention relates to a method for intercepting and connecting underground formations containing hydrocarbons, so as to make the production and injection of hydrocarbons technically and financially feasible in land and offshore oil production zones. It is claimed to be a method for the production and/or injection of hydrocarbons through thusly connected underground formations.

1 . Method for interception and connection of underground formations characterized by the following stages: 
 drill and complete a primary multilateral well and encase a part of the main well of the multilateral well, leaving a section of the well open to carry out connecting operations;    drill at least one second multilateral well, located at a point away from the head of the well of the primary multilateral well, and encase the main well of the second multilateral well;    intercept the primary multilateral well from the second multilateral well, by using a proper tool;    mechanically connect the primary multilateral well with the second multilateral well;    finish connecting both of the multilateral wells, allowing for the produced or injected fluid to drain off from one multilateral well to the other;    produce or inject from one of the multilateral wells in such a way that the well, (in which production is not taking place at the moment) is or not closed for production or injection optimization.    
   
   
       2 . Method in accordance with  claim 1 , characterized by including the stages of: 
 a) drill a multilateral well to be made according to the requirements for production area development, which, by using proper geometry, shall reach at least one subterranean formation, said multilateral well should have lateral wells connected to the underground formations.    b) encase a part of the main well of primary multilateral well steel pipes, leaving a section of the well open to carry out connecting operations;    c) complete lateral wells of the primary multilateral well with a proper filtering device, after the main multilateral well has been encased;    d) drill at least one second multilateral well according to the requirements for production area development, which, using proper geometry, should reach at least one subterranean formation, containing hydrocarbons. Said subterranean formation should be located at a point away from the head of the first well of the primary multilateral well, with a production probe providing support to the primary multilateral well, said second multilateral well should possess lateral wells;    c) complete lateral wells of the second multilateral well with a proper filtering device;    f) encase the main well of the multilateral well;    g) install a magnetic emitter in the primary multilateral well to orient the interception of the primary multilateral well towards another multilateral well;    h) to gain access for the interception from the primary multilateral well to the second multilateral well, using conventional tools of navigation with the effect of the magnetic field emitted by the transmitter located in primary multilateral well;    i) leave a fluid differential, when possible, in order to be aware of the interception in one of the wells;    j) make a mechanical connection between the multilateral wells;    k) finish the well duct (main well), allowing for the oil fluid to drain off from one multilateral well another multilateral well;    l) produce or inject both multilateral wells through the second multilateral well or the primary multilateral well.    
   
   
       3 . Method in accordance with  claim 2 , characterized by a filtering device such as a cut “liner”, cloth, or gravel pack.  
   
   
       4 . Method in accordance with  claim 2 , characterized by a connection between the wells in Stage (j) to be made using a hollow guide shoe connected to an external casing packer, which has one end connected to the primary steel tube used for casing the second multilateral well.  
   
   
       5 . Method in accordance with  claim 2 , characterized by a connection between the wells of Stage (j) to be made using a mandril, a set of wash-cups, and a hollow guide shoe; all connected to the casing column.  
   
   
       6 . Method for producing and/or injecting hydrocarbons through connecting underground formations, characterized by being carried into underground formations connected by the method of  claim 1.