Patents Assigned to Etudes et Fabrication Dowell Schlumberger
  • Cement slurry compositions for cementing oil wells, adapted to control free water and corresponding cementing process
    Patent number: 4778528
    Abstract: The invention relates to an additive adapted to suppress free water in conditions of "over-dispersion" of the cement when cementing an oil well. This additive is selected from cerain metal soluble salts such as Mg, Ni, etc. This additive modifies neither the other properties of the slurry (in particular setting time) nor the action of other additives (in particular of retarders).
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: October 18, 1988
    Assignee: Etudes et Fabrication Dowell Schlumberger
    Inventor: Camille Defosse
  • Fluid loss additive for cement
    Patent number: 4568471
    Abstract: An aqueous solution of a terpolymer, useful as fluid loss agent for drilling muds and not for cement slurries, is treated with acid and heat. An excellent fluid loss agent for cement is obtained. Very efficient liquid additive, for all purposes, which does not modify either the rheology, nor substantially the setting time.
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: February 4, 1986
    Assignee: Etudes et Fabrication Dowell-Schlumberger
    Inventor: Camille Defosse
  • Quick-release coupling
    Patent number: 4550935
    Abstract: The invention relates to a quick-release coupling, more particularly intended for hose pipe assemblies used at sea.Said coupling is composed of two jaws which cooperate with truncated parts of the coupling members and are held together or released by the movement of a finger sliding inside bores provided in said jaws.The coupling according to the invention offers improved efficiency and reliability.
    Type: Grant
    Filed: December 21, 1982
    Date of Patent: November 5, 1985
    Assignee: Etudes et Fabrication Dowell Schlumberger
    Inventors: Lloyd B. Marshall, Faycal Ghebrid
  • Cement compositions for cementing wells, allowing pressure gas-channeling in the cemented annulus to be controlled
    Patent number: 4537918
    Abstract: The invention relates to cement compositions for cementing wells, which allow pressure gas-channeling to be effectively controlled up to more than about 485.degree. F. The cement composition contains a styrene-butadiene latex and a stabilizer. The film of latex interrupts gas-channeling after an extremely brief path.
    Type: Grant
    Filed: March 30, 1983
    Date of Patent: August 27, 1985
    Assignee: Etudes et Fabrication Dowell Schlumberger
    Inventors: Philippe A. Parcevaux, Bernard M. Piot, Claude J. Vercaemer
  • Method for obtaining gelled hydrocarbon compositions, the compositions according to said method and their application in the hydraulic fracturing of underground formations
    Patent number: 4507213
    Abstract: The invention relates to a method for obtaining gelled hydrocarbon compositions, and their application in the hydraulic fracturing of rocks.The gelling method according to the invention uses as an activator a partially neutralized aluminum acid salt.
    Type: Grant
    Filed: December 23, 1982
    Date of Patent: March 26, 1985
    Assignee: Etudes et Fabrication Dowell Schlumberger
    Inventors: Gerard Daccord, Richard Lemanczyk, Claude Vercaemer