System and method for production of a primary fluid, such as oil, from an underground reservoir

Abstract

The invention relates to a system and a method for production of a fluid from an underground reservoir. The system comprises a casing ( 10 ) with an internal tubing ( 11 ). At least one plug-in device to be received in the tubing, Means for wire line installation and retrievement of the plug-in device; Means for (un)locking and means for sealing the plug-in device in the casing. Two secondary fluid lines ( 15 ) alongside the tubing are connectable to the plug-in device for operating. The system comprises one or more plug-in devices, each comprising at least one functional section, wherein for pumping devices the first functional section comprises a drive for a pump, which is connectable to the drive such that the pump lies closer to the reservoir than the drive in the position of use. The plug-in devices can be placed at different positions P1 through P6 in the tubing.

1 . System for production of a primary fluid, such as oil, from an underground reservoir, comprising:
 A casing to be put into the ground for defining an internal elongate hollow tubing running in the direction of the reservoir;   At least one plug-in device to be received in the tubing, which plug-in device is provided with means for sealing the plug-in device in the tubing;   Means for wire line installation and retrievement of the plug-in device in the tubing;   Means for locking and unlocking the plug-in device in the tubing;   wherein the casing comprises at least two secondary fluid lines running in longitudinal direction substantially parallel to the tubing, which secondary fluid lines are connectable to the plug-in device for operating the plug-in device,   Characterised in that   the system comprises a set of two or more plug-in devices, each providing a different technical function in relation to production of the primary fluid, each comprising at least one functional section extending between adjacent sealing means, wherein the first functional section of a first plug-in device comprises a drive for a pump, wherein the pump is connectable to the drive such that the pump lies closer to the reservoir than the first functional section in the position of use.   
     
     
         2 . System for production of a primary fluid according to  claim 1 , wherein the functional section of a second plug-in device comprises an internal passage for unobstructed flow of the primary fluid. 
     
     
         3 . System for production of a primary fluid according to  claim 2 , wherein an open cage is connected to the second plug-in device for accommodating measurement devices, such as temperature, pressure or flow measurement devices. 
     
     
         4 . System for production of a primary fluid according to  claim 1 , wherein the functional section of a third plug-in device is arranged for injection of a tertiary fluid into the reservoir through the secondary fluid lines, wherein the functional section comprises a number of flow out openings for the tertiary fluid. 
     
     
         5 . System for production of a primary fluid according to  claim 4 , wherein the flow out openings are provided with closure means that are pretensioned in the closed position. 
     
     
         6 . System for production of a primary fluid according to  claim 4 , wherein the tertiary fluid is water or gas, wherein the drive is arranged to be driven by the tertiary fluid, wherein the tertiary fluid can be discharged by mixing it with the primary fluid produced by the system. 
     
     
         7 . System for production of a primary fluid according to  claim 1 , wherein the drive is a hydraulic drive arranged to be driven by a hydraulic fluid to be fed through the secondary fluid lines. 
     
     
         8 . System for production of a primary fluid according to  claim 1 , wherein the pump is a plunger or piston pump, a positive displacement pump or a centrifugal displacement pump. 
     
     
         9 . System for production of a primary fluid according to  claim 1 , wherein a number of plug-in devices comprise at least two functional sections arranged adjacently, such that as seen in the longitudinal direction of the tubing the first functional section is positioned closer to the surface than a second functional section. 
     
     
         10 . System according to  claim 9 , wherein the second functional section comprises a pump for production of the primary fluid and the first functional section comprises a drive for the pump, wherein a jet pump or a gas lift valve is arranged in the second functional section between the drive and the pump. 
     
     
         11 . System according to  claim 9 , wherein the jet pump is a venturi jet pump. 
     
     
         12 . System according to  claim 9 , wherein the drive is a turbo motor drive. 
     
     
         13 . System according to  claim 9 , wherein the pump is a centrifugal pump. 
     
     
         14 . Plug-in device for production of a primary fluid, such as oil, from an underground reservoir, wherein a casing is to be put into the ground for defining an internal elongate hollow tubing running in the direction of the reservoir, wherein said plug-in device is arranged for wire line installation and retrievement of the plug-in device in the tubing, said plug-in device is arranged for sealing the plug-in device in the tubing, said plug-in device is arranged for locking and unlocking the plug-in device in the tubing, wherein the casing comprises at least two secondary fluid lines running in longitudinal direction substantially parallel to the tubing, wherein said plug-in device is connectable to the secondary fluid lines for operating the plug-in device, said plug-in device comprising at least one functional section extending between adjacent sealing means for providing a technical function in relation to production of the primary fluid. 
     
     
         15 . Plug-in device according to  claim 14 , wherein the functional section comprises a drive for a pump, wherein the pump is connectable to the drive such that the pump lies closer to the reservoir than the functional section in the position of use. 
     
     
         16 . Plug-in device according to  claim 14  comprising at least two functional sections arranged adjacently. 
     
     
         17 . Plug-in device according to  claim 16 , wherein each functional section is provided with an inlet and an outlet for connection to the secondary fluid lines. 
     
     
         18 . Method for production of a primary fluid, such as oil, from an underground reservoir, whereby a casing is to be put into the ground for defining an internal elongate hollow tubing running in the direction of the reservoir, comprising the steps of:
 a) Selecting a plug-in devices to be received in the tubing;   b) Installing the plug-in device in the tubing using wire line installation means;   c) Locking the plug-in device in the tubing;   d) Running and installing the tubing and secondary lines into the casing in the wellbore;   e) Operating the plug-in device by feeding secondary or tertiary fluid into the plug-in device;   f) Unlocking the plug-in device from the tubing;   g) Retrieving the plug-in device out of the tubing using wire line retrievement means; and   h) Optionally repeating steps a, b, c, e, f and g for another plug-in device, said other plug-in device providing a different technical function in relation to production of the primary fluid.