Exploitation method for reservoirs containing hydrogen sulphide

  • US 4,988,389 A
  • Filed: 06/12/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 10/02/1987
  • Status: Expired due to Term
First Claim
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1. A method of substantially preventing deposition of sulphur from fluids containing hydrogen sulphide and sulphur on elements of a well, which penetrates a subterranean reservoir, during extraction of the reservoir fluids through the well, the well comprising:

  • an outer tubular casing;

    first and second fluid pathways which are disposed within the outer casing;

    an extraction interval comprising an opening in the outer casing for permitting entry of the reservoir fluids into the well;

    an annular seal disposed within the outer casing above said extraction interval;

    a jet pump disposed within said first fluid pathway and located above said annular seal;

    a tailpipe in communication with said first fluid pathway and extending below said annular seal to said extraction interval at a depth below the point of entry of the reservoir fluids into the well;

    a chemical injection tubing disposed within the outer casing and extending to a depth below said annular seal, at a depth below the point of entry of the reservoir fluids into the well, wherein the method comprises;

    (i) injecting power fluid into said second fluid pathway;

    (ii) injecting a sulphur solvent into said chemical injection tubing for circulating said injected sulphur solvent with the reservoir fluids;

    (iii) driving said jet pump with said power fluid which enters said jet pump from said second fluid pathway and is commingled with and entrains the reservoir fluids to cause said commingled fluids to flow to the surface through said first fluid pathway;

    whereby a pressurizing action of said jet pump retains sulphur in a dissolved, non-plugging state within said commingled fluids and a liquid film is formed on surfaces of said first fluid pathway which impedes and substantially prevents the deposition of sulphur upon the surfaces of said first fluid pathway.

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