Measurement device by pressurizing the subsoil and method for carrying out an associated pressurization test

Abstract

The unit for measuring the volume of fluid comprises a device for measuring the mass of the fluid reservoir.

1 . A measuring device for pressurizing the subsurface, comprising:
 at least one pressiometric probe intended to be inserted into a borehole in the subsurface, said pressiometric probe comprising at least one deformable cell,   a fluid reservoir comprising a container and a volume of fluid contained in the container,   a transfer unit configured to introduce the fluid from the fluid reservoir inside the deformable cell, said unit comprising a transfer member including a suction line fluidly connected to said fluid reservoir, and a discharge line fluidly connected to the deformable cell,   a unit for measuring the volume of fluid transferred from the fluid reservoir to the inside of the deformable cell,   wherein the unit for measuring the volume of fluid comprises a device for measuring the mass of the fluid reservoir.   
     
     
         2 . The measuring device for pressurizing the subsurface according to  claim 1 , further comprising an emptying line fluidly connected to the discharge line and to the fluid reservoir, said emptying line being configured to empty the fluid contained in the deformable cell into the fluid reservoir. 
     
     
         3 . The measuring device for pressurizing the subsurface according to  claim 2 , wherein the emptying line comprises a valve intended to control the fluid flow rate in the emptying line. 
     
     
         4 . The measuring device for pressurizing the subsurface according to  claim 2 , wherein the suction line and/or the emptying line are submerged in the fluid reservoir. 
     
     
         5 . The measuring device for pressurizing the subsurface according to  claim 2 , wherein the fluid reservoir comprises at least one side wall and one lower wall, and the suction line and/or the emptying line have no mechanical connection with said side wall and said lower wall. 
     
     
         6 . The measuring device for pressurizing the subsurface according to  claim 1 , wherein the device for measuring the mass of the fluid reservoir is suitable for measuring a mass with a measuring error less than or equal to 0.2 g. 
     
     
         7 . The measuring device for pressurizing the subsurface according  claim 1 , wherein the device for measuring the mass of the fluid reservoir is a scale arranged below the fluid reservoir. 
     
     
         8 . A method for carrying out a test for pressurizing the subsurface with a measuring device according to  claim 1 , comprising:
 a step for inserting the pressiometric probe into a borehole,   a step for introducing fluid from the fluid reservoir inside the deformable cell using the transfer unit,   a first step for measuring a first mass of the fluid reservoir before introducing fluid inside the deformable cell using the device for measuring the mass of the fluid reservoir,   a second step for measuring a second mass of the fluid reservoir after introducing fluid inside the deformable cell using the device for measuring the mass of the fluid reservoir,   a step for determining the volume of fluid introduced inside the deformable cell, comprising a sub-step for subtracting the second mass and the first mass.   
     
     
         9 . The method for carrying out a test for pressurizing the subsurface according to  claim 8 , further comprising a preliminary step for determining the density of the fluid from the fluid reservoir and a step for correcting the volume determined using said density. 
     
     
         10 . A method for carrying out a test for pressurizing the subsurface according to  claim 8 , further comprising:
 a step for emptying fluid from the deformable cell toward the fluid reservoir using the transfer unit,   a step for measuring a third mass of the fluid reservoir after emptying the deformable cell into the fluid reservoir using the device for measuring the mass of the fluid reservoir,   a step for comparing the first mass and the third mass of the fluid reservoir,   a step for determining outside leaks of the measuring device.