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Use of an acid soluble or degradable solid particulate and an acid liberating or acid generating composite in the stimulation of a subterranean formation

  • US 10,287,865 B2
  • Filed: 05/15/2015
  • Issued: 05/14/2019
  • Est. Priority Date: 05/19/2014
  • Status: Active Grant
First Claim
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1. A method of stimulating a subterranean formation penetrated by a well comprising:

  • (a) pumping into the well and into a first zone within the subterranean formation (i) an acid soluble or acid degradable solid particulate and (ii) a composite comprising an acid adsorbed onto a water-insoluble adsorbent or an acid generating compound adsorbed onto a water-insoluble adsorbent, wherein the acid soluble or acid degradable solid particulate and the composite are pumped into the well in separate stages;

    (b) blocking permeability in the first zone with the acid soluble or acid degradable solid particulate;

    (c) pumping a stimulation fluid into the well;

    (d) diverting the flow of the stimulation fluid to a second zone within the formation, wherein the permeability of the first zone in step (a) is higher than the permeability of the second zone; and

    (e) solubilizing or degrading the acid soluble or acid degradable solid particulate in the first zone by releasing or generating acid from the water-insoluble adsorbent.

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