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Portable drill string compensator

  • US 6,968,900 B2
  • Filed: 12/09/2002
  • Issued: 11/29/2005
  • Est. Priority Date: 12/09/2002
  • Status: Expired due to Term
First Claim
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1. A closed system drill string compensator comprising:

  • a cylinder having a cylinder inner wall surface, a cylinder outer wall surface and a cylinder cavity;

    a piston;

    a piston rod having a first piston rod end and a second piston rod end, the first piston rod end being connected to the piston;

    the piston and the piston rod being slidably engaged within the cylinder cavity thereby dividing the cylinder cavity into a rod side cavity containing a first portion of hydraulic fluid under pressure disposed therein and a piston side cavity, the piston and the piston rod each having a retracted position and a plurality of extended positions;

    an accumulator surrounding the cylinder, the accumulator having a first accumulator inner wall surface, a second accumulator inner wall surface, an accumulator outer wall surface, and an accumulator cavity, the accumulator cavity being in fluid communication with the rod side cavity, the accumulator cavity containing a second portion of hydraulic fluid and a gas under pressure;

    the cylinder and accumulator having a first closed end and a second closed end, the first closed end having a first attachment member and the second closed end having a piston rod passageway through which the second piston rod end passes, the second piston rod end being connected to second attachment member, andwherein the second closed end includes a base having a lock bar assembly for securing the drill string compensator in the retracted position; and

    at least one air pressure vessel radially disposed around the cylinder and the accumulator, each of the at least one air pressure vessel being in fluid communication with the accumulator cavity.

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