Downhole oil recovery system and method of use

Abstract

An oil recovery system may comprise a generally hollow pump housing having an interior space, a downstroke powerline and an upstroke powerline, a power piston disposed in the interior space of the pump housing, a connecting rod having a first end attached to the power piston, a production piston attached to a second end of the connecting rod, a seal disposed between the production piston and the power piston, an oil inlet in fluid communication with a reservoir, and an oil inlet valve in fluid communication with the oil inlet. The power piston may be movable between a first position and a second position by power fluid delivered through the upstroke powerline or the downstroke powerline.

1 . An oil recovery system comprising:
 a generally hollow pump housing having an interior space;   a downstroke powerline and an upstroke powerline in fluid communication with said interior space of said pump housing;   a power piston disposed in said interior space of said pump housing;   a connecting rod disposed in said interior space of said pump housing and having a first end attached to said power piston;   a production piston being attached to a second end of said connecting rod;   a seal disposed between said production piston and said power piston;   an oil inlet in fluid communication with a reservoir located in said interior space of said pump housing; and   an oil inlet valve in fluid communication with said oil inlet;   wherein said power piston is movable between a first position and a second position by power fluid delivered through said upstroke powerline or said downstroke powerline; and   wherein said seal allows at least a portion of said power fluid to pass through said seal.   
   
   
       2 . The oil recovery system of  claim 1  wherein said downstroke powerline and said upstroke powerline comprise coil tubing. 
   
   
       3 . The oil recovery system of  claim 1  wherein said pump housing comprises coil tubing. 
   
   
       4 . The oil recovery system of  claim 1  wherein said production piston is disposed at a bottom end of said connecting rod and said power piston is disposed at a top end of said connecting rod. 
   
   
       5 . The oil recovery system of  claim 1  wherein said production piston is disposed at a top end of said connecting rod and said power piston is disposed at a bottom end of said connecting rod. 
   
   
       6 . The oil recovery system of  claim 1  wherein said power fluid comprises water-based fluid. 
   
   
       7 . The oil recovery system of  claim 1  wherein said pump housing is removable. 
   
   
       8 . The oil recovery system of  claim 1  further comprising a surface pump unit having a sensor wherein said surface pump unit is connected to said downstroke powerline and said upstroke powerline. 
   
   
       9 . The oil recovery system of  claim 1  wherein said power piston moves upward when power fluid travels through said upstroke powerline and into an upstroke reservoir located in said interior space of said pump housing. 
   
   
       10 . The oil recovery system of  claim 1  wherein said power piston moves downward when power fluid travels through said downstroke powerline and into a downstroke reservoir located in said interior space of said pump housing. 
   
   
       11 . The oil recovery system of  claim 1  wherein said upstroke powerline and said downstroke powerline extend along a length of said pump housing. 
   
   
       12 . The oil recovery system of  claim 1  wherein said power piston and said production piston are shaped and sized such that production fluid is sucked through said oil inlet valve and into a first reservoir upon an upstroke of said power piston. 
   
   
       13 . The oil recovery system of  claim 1  further comprising a second oil inlet in fluid communication with a second reservoir located in said interior space of said pump housing. 
   
   
       14 . The oil recovery system of  claim 1  wherein said oil inlet is disposed in fluid communication with said seal. 
   
   
       15 . The oil recovery system of  claim 14  further comprising a valve disposed in fluid communication with said oil inlet valve. 
   
   
       16 . The oil recovery system of  claim 1 , wherein said power fluid comprises at least one additive. 
   
   
       17 . The oil recovery system of  claim 16  wherein said at least one additive is selected to inhibit biological corrosion of at least one component of said oil recovery system. 
   
   
       18 . The oil recovery system of  claim 16  wherein said at least one additive is selected to inhibit chemical corrosion of at least one component of said oil recovery system.