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Apparatus for sampling and logging on all producing zones of a well

  • US 7,373,812 B2
  • Filed: 05/31/2002
  • Issued: 05/20/2008
  • Est. Priority Date: 06/07/2001
  • Status: Expired due to Fees
First Claim
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1. A full reservoir sampling and testing apparatus comprising:

  • a ground surface testing and controlling tool including;

    a power supply controller, anda computer system storing relevant control, analysis and interpretation software; and

    a downhole tool including;

    a wireline bridle coupled to said ground surface testing and controlling tool via a wireline,an adapter joint coupled to said wireline bridle,a gamma ray detector coupled to said adapter joint, for detecting said gamma ray in said formation,an electric unit coupled to said gamma ray detector,a single probe unit coupled to said electric unit,a pumping unit, an upper portion of said pumping unit is coupled to said single probe unit, said pumping unit is adapted to perform pump discharging for discharging formation mud filtrate into high back pressure mud in a well bore, to perform pumping pre-test for performing various-volume pre-tests, and to perform pumping and sampling for closing a discharging passage of said mud filtrate through program control and pumping a sample into a sampling chamber when the sample is identified as a formation original fluid sample in which the level of the mud filtrate in the sample reaches a sensor-determined level during said pump discharging,a dual packer unit coupled to a lower portion of said pumping unit and used to seal and isolate said formation to be tested up and down,a multi sampling unit coupled to said dual packer unit; and

    a base cone coupled to said multi sampling unitwherein a pump piston of said pumping unit is provided with a suction chamber having a pre-test function, volume of said suction chamber can be changed from zero to a predetermined value repeatedly under action of hydraulic pressure, thus performing pre-test many times, wherein the maximum volume of said suction chamber is 500 ml, thus providing various pre-test flows having a large variation range so as to meet requirements of various formations;

    wherein said multi sampling unit comprises a plurality of sampling chambers of high pressure, one artesian flow sampling chamber, and a series of control valves and sample transport valves;

    a piston is provided in each sampling chamber to partition said sampling chamber into an upper chamber for collecting sample and a lower chamber having an opening communicated with well fluid mud, thus ensuring pressure in said sampling chamber being much higher than formation static pressure while and after sampling is performed.

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