Double-plate and double-cylinder pump

Abstract

The present invention relates to a pump (1) comprising two pumping assemblies distributed symmetrically about a plane perpendicular to the axis of a driveshaft (12), each pumping assembly comprising a cylinder (4, 5), a plate (2, 3), an intake pipe (8, 9) and a delivery pipe (10, 11), the plates (2, 3) of each assembly being connected to one another at said plane of symmetry.

1 . A barrel-type piston pump comprising at least one driveshaft, a first pumping assembly and a second pumping assembly, each pumping assembly being formed of elements comprising at least one plate, a cylinder block, an intake pipe and a delivery pipe, the cylinder block comprising at least two compression chambers distributed circumferentially, at least two pistons respectively in translational movement in the compression chambers of the cylinder block of each of the assemblies, the plate of each of the two assemblies being inclined at an angle with respect to the axis of rotation of the driveshaft, the driveshaft generating a relative rotational movement between the plate and the cylinder block of each of the two assemblies, wherein the elements of the second assembly are distributed symmetrically with respect to the elements of the first assembly about a plane perpendicular to the axis of rotation of the driveshaft, and in that the plates of the two assemblies are connected to one another at the plane of symmetry. 
     
     
         2 . The pump as claimed in  claim 1 , wherein the intake and delivery pipes of a one same assembly are positioned symmetrically with respect to the axis of the driveshaft. 
     
     
         3 . The pump as claimed in  claim 1 , wherein the pump comprises means for controlling the angular inclination of the plate of each of the assemblies with respect to the axis of the driveshaft. 
     
     
         4 . The pump as claimed in  claim 1 , wherein the plates of the two assemblies are formed as a single unit. 
     
     
         5 . The pump as claimed in  claim 1 , wherein the plates of the two assemblies may be connected to one another by connecting means that pass through the plane of symmetry. 
     
     
         6 . The pump as claimed in  claim 5 , wherein the connecting means comprise a pivot connection positioned at a point situated substantially at the periphery of the two plates. 
     
     
         7 . The pump as claimed in  claim 1 , wherein the relative rotational movement is a rotational movement of the plate of each of the assemblies. 
     
     
         8 . The pump as claimed in  claim 7 , wherein each of the assemblies additionally comprises a wobble plate, the wobble plate of each of the assemblies being pivot-connected to the rotating plate of the one same assembly. 
     
     
         9 . The pump as claimed in  claim 1 , wherein the relative rotational movement is a rotational movement of the cylinder block of each of the assemblies. 
     
     
         10 . The pump as claimed in  claim 1 , wherein the angle of inclination of the plate of each of the assemblies with respect to the axis of the driveshaft is comprised between 70 and 90° in terms of absolute value. 
     
     
         11 . The use of the barrel-type piston pump as claimed in  claim 1  for a drilling operation, particularly for injecting drilling mud into a drilled well. 
     
     
         12 . A method for conducting for a drilling operation, comprising injecting drilling mud into a drilled well using the barrel-type piston pump as claimed in  claim 1 .