Patents by Inventor Sze-Foo Chien

Sze-Foo Chien has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5421209
    Abstract: Apparatus and method for concurrently determining steam flow rate and quality, through a conduit which comprises an orifice plate positioned in series with a critical flow venturi in said conduit. Pressure sensing means in the conduit senses pressures therein for application in a formula to provide the desired steam values and provide a method for determining both the quality and the mass flow rate of steam flow passing through the conduit. The measurements are of particular value in the instance of steam flow where a minimal decrease in steam pressure across the measuring instrument is a relevant factor.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: June 6, 1995
    Assignee: Texaco Inc.
    Inventors: Clifford L. Redus, James W. Scott, Sze-Foo Chien, Peter L. Sigwardt
  • Patent number: 5404745
    Abstract: A method and apparatus for determining and monitoring the quality of steam by measuring the critical velocity of the steam flowing through a nozzle.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: April 11, 1995
    Assignee: Texaco Inc.
    Inventor: Sze-Foo Chien
  • Patent number: 5214956
    Abstract: Steam quality is determined by taking a sample of the steam and measuring the steam pressure and the rate of condensate of the sampled steam.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: June 1, 1993
    Inventor: Sze-Foo Chien
  • Patent number: 5182939
    Abstract: The quality of steam downhole is determined by injecting into the steam first and second tracers, each tracer having an affinity to a single of the two phases, and then sensing the passage of the tracers over a pair of sensors spaced apart or known measured distance. Thus the velocity of the phases, the slip ratio between the phases and the steam quality can be determined.
    Type: Grant
    Filed: April 1, 1991
    Date of Patent: February 2, 1993
    Assignee: Texaco Inc.
    Inventors: Sze-Foo Chien, Eugene F. Traverse
  • Patent number: 5141055
    Abstract: Method and Apparatus for injection steam of know quality into a subterranean reservoir containing hydrocarbon fluids, to enhance or stimulate production of said fluids through a production well. Production stimulating steam from a pressurized source is injected into the reservoir by way of a critical flow venturi and an injection well, in a manner to maintain the steam at a desired pressure and flow rate. The venturi's constricted throat is formed as a function of the stimulating steam's original characteristics.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: August 25, 1992
    Assignee: Texaco Inc.
    Inventors: Sze-Foo Chien, Joseph A. Anderson, Clifford L. Redus, James W. Scott, Peter L. Sigwardt
  • Patent number: 5092159
    Abstract: A system for measuring steam flowing through a convergent-divergent nozzle at critical flow uses selected measurements along with Napier's Parameter, Dimensionless Critical Steam Flux and Critical Density Ratio to determine steam quality and flow rate.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: March 3, 1992
    Assignee: Texaco Inc.
    Inventor: Sze-Foo Chien
  • Patent number: 5035146
    Abstract: A method and apparatus for determining the quality of steam and steam flow rate use the thrust or impact force of the steam against a device in the steam flow path and restriction data from a choke or orifice plate. The impact force can be read from a variety of devices mounted in the steam flow path and using known electrical and/or mechanical reading and recording techniques. The restriction data can be derived from measurements taken across known flow restriction devices such as an orifice plate or a choke.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: July 30, 1991
    Assignee: Texaco Inc.
    Inventor: Sze-Foo Chien
  • Patent number: 4849988
    Abstract: Steam quality measuring and monitoring apparatus and methods which measures the quality of steam flowing in a steam pipe includes a test cell connected in line with the steam pipe so that the steam flows through the test cell. The capacitance, the dielectric constant, the temperature and the density of the steam flowing through the test cell are measured and monitored and the quality of the steam is derived in accordance with the steam density and temperature.
    Type: Grant
    Filed: February 19, 1988
    Date of Patent: July 18, 1989
    Assignee: Texaco Inc.
    Inventor: Sze-Foo Chien
  • Patent number: 4836032
    Abstract: The use of an orifice plate in series with a critical flow choke provides a method of measurement for both steam quality and mass flowrate. Neither the orifice plate or the choke alone can be used to measure steam quality and mass flowrate. However, an expression for steam quality through both devices is obtained by solving an independent mass flowrate equation for each device--an equation for wet steam through the critical flow choke and an equation for wet steam through a sharp edged orifice plate.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: June 6, 1989
    Assignee: Texaco, Inc.
    Inventors: Clifford L. Redus, Sze-Foo Chien, Peter L. Sigwardt
  • Patent number: 4681466
    Abstract: In a steam flow line that is delivering reduced quality steam, there is a method and/or system for determining the quality. It includes the steps of flowing quality steam through a first flow restriction, and mixing a measured quantity of water with the steam, downstream from the restriction. It also includes flowing the mixture through a second flow restriction. Then, by measuring pressures and temperatures, the quality of the steam at the second flow restriction may be calculated. Where the pressure drop across the second flow restriction is very small compared to the supply line pressure, the quality of the steam downstream is essentially the same, and thus determined.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: July 21, 1987
    Assignee: Texaco Inc.
    Inventors: Sze-Foo Chien, Clifford L. Redus, Peter L. Sigwardt
  • Patent number: 4577691
    Abstract: Method and apparatus for thermally stimulating bitumen and other viscous hydrocarbon products from a subterranean formation in which the product is held. A plurality of wells are formed in the layer, which wells extend from the surface into a generally horizontal direction through the productive subterranean layer. The respective wells are spaced vertically apart whereby a thermal stimulating fluid such as steam can be selectively injected into discrete segments of the layer. Such injection will achieve the most effective sweeping action by the stimulating fluid through the productive layer. There results an orderly downward flow of the produced product and a more uniform and efficient distribution of heat in the stimulated formation.
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: March 25, 1986
    Assignee: Texaco Inc.
    Inventors: Wann-Sheng Huang, Sze-Foo Chien
  • Patent number: 4126182
    Abstract: Methods and mechanisms are disclosed comprising means for mixing only water with crude oil at temperatures above 32.degree. F. until the inversion point is crossed where a lower viscosity emulsion consisting of oil-in-water is formed for reducing resistance to flow of crude oil up from deep in a well to the surface, or through a pipeline. This oil-in-water emulsion consists of, by volume, 5 percent to 15 percent oil and 95 percent to 85 percent water.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: November 21, 1978
    Assignee: Texaco Inc.
    Inventors: Joseph C. Allen, Sze-Foo Chien
  • Patent number: 4100967
    Abstract: Mechanisms are disclosed comprising means for mixing only water with crude oil at temperatures above 32.degree. F. until the inversion point is crossed where a lower viscosity emulsion consisting of oil-in-water is formed for reducing resistance to flow of crude oil up from deep in a well to the surface, or through a pipeline. This oil-in-water emulsion consists of, by volume, 5 percent to 15 percent oil and 95 percent to 85 percent water, respectively.
    Type: Grant
    Filed: August 16, 1976
    Date of Patent: July 18, 1978
    Assignee: Texaco Inc.
    Inventors: Joseph C. Allen, Sze-Foo Chien