Arrangement for hydrocarbon extraction in oil wells

Abstract

An extraction arrangement for the extraction of hydrocarbons that allows reducing related costs by simplifying the structure, reducing the number of parts used in this type of arrangement, and consequently reducing the associated risks and facilitating both operation and maintenance tasks, also optimizing the extraction capacity of the pump by not having leaks in seals because the latter are not necessary as it is a fixed tube.

I claim: 
     
         1 . An arrangement for extracting hydrocarbons in oil wells, wherein the arrangement has a wellhead connected to a well casing, and an extraction assembly operatively arranged within said well casing, said extraction assembly being formed by a fluid collecting container that has an open upper end for the entry of oil into the collecting container and a lower end that can be closed, the extraction assembly being connected to a traction cable to raise and lower the extraction assembly and, wherein the arrangement for extracting hydrocarbons comprises:
 at least one suction tube arranged in a fixed position in said wellhead and having at least one end portion positioned within said well casing with at least one suction inlet operatively submersible in hydrocarbon extracted and contained within said collecting container, and an opposite end connected to a suction pump, said suction tube being radially offset with respect to a geometric center of the casing and remaining operatively inside the collecting container when the collecting container is in a hydrocarbon discharge position.   
     
     
         2 . An arrangement according to  claim 1 , wherein said collecting container has at least one centralizer at the open upper end of the collecting container. 
     
     
         3 . An arrangement according to  claim 2 , wherein said centralizer is a frustoconical ring that forms part of the upper end of the collecting container. 
     
     
         4 . An arrangement according to  claim 2 , wherein said centralizer is a frustoconical ring that is removably connected to the upper end of the collecting container. 
     
     
         5 . An arrangement according to  claim 1 , wherein said well head is provided with a press tee assembly comprising at least one proximity sensor capable of detecting an actuating bushing. 
     
     
         6 . An arrangement according to  claim 5 , wherein said proximity sensor for detecting the actuating bushing is attached to said traction cable. 
     
     
         7 . An arrangement according to  claim 5 , wherein said actuating bushing rests on a support in the proximity of the proximity sensor and comprises an internal through passage through which said traction cable passes, which is provided with a secondary bushing being attached to it and which comes into operative contact against said actuating bushing so as to drag it up and/or down according to the movement of the traction cable. 
     
     
         8 . An arrangement according to  claim 5 , wherein said wellhead further comprises a gland stop arranged upstream of said press tee assembly, which comprises a plurality of conical seals through which said traction cable rises and falls, wherein at least one cable guide and guide bushing are in the upper part of said gland stop. 
     
     
         9 . An arrangement according to  claim 8 , wherein said conical seals are made of rubber. 
     
     
         10 . An arrangement according to  claim 8 , wherein said cable guide is made of PVC. 
     
     
         11 . An arrangement according to  claim 8 , wherein said guide bushing is made of bronze. 
     
     
         12 . An arrangement according to  claim 5 , wherein said proximity sensor is a Namur sensor. 
     
     
         13 . An arrangement according to  claim 1 , wherein a centralizer is further provided which comprises:
 at least one external guide that extends parallel and adjacent to a vertical section of the suction tube positioned inside the casing, said external guide being fixed on both end portions of the vertical section of the suction tube by means of respective supports; and   at least one spring hook arranged in the proximity of a lower end of the external guide and housing inside it a lower portion of said external guide, said traction cable passing through the at least one spring hook.   
     
     
         14 . An arrangement according to  claim 1 , wherein at least one fluid retaining means is provided arranged in the end portion of the suction tube and in the proximity of the suction inlet, the at least one fluid retaining means comprising a ball valve operatively housed on a seat, and an upper stop. 
     
     
         15 . An arrangement according to  claim 1 , wherein a capacitive speed sensor is provided in a portion of said suction tube.