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Removing scale from oil wells

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专利汇可以提供Removing scale from oil wells专利检索,专利查询,专利分析的服务。并且A workover process for removing calcium sulfate scale from oil wells includes introducing into the well and into contact with the scale an aqueous solution of sodium or potassium gluconate and sodium or potassium hydroxide. The weight ratio of gluconate to hydroxide is between about 2:1 and about 5:1 to give a direct solvent action. The concentration is between about 10 percent and about 30 percent by weight. The solvent can be used in connection with other workover steps such as the use of string shots, bailing, use of organic solvents such as paraffin solvents, acidizing, fracturing, and use of scale inhibitors.,下面是Removing scale from oil wells专利的具体信息内容。

  • 2. The process of claim 1 in which said gluconate and hydroxide are sodium gluconate and sodium hydroxide.
  • 3. The process of claim 2 in which said aqueous solution is prepared by first dissolving the sodium hydroxide in the water and then dissolving the sodium gluconate.
  • 4. The process of claim 1 in which said solution is allowed to remain in the well in contact with said scale for a period of time in the range from about 4 to about 48 hours at a temperature in the range from about 80* F. to about 200* F.
  • 5. The process of claim 1 in which an acid treating step is also employed to remove calcium carbonate, iron salts and other acid-soluble materials.
  • 6. The process of claim 1 in which pressure is applied to said solution in said well to force said solution back into the formation to dissolve calcium sulfate scale within flow channels in the formation.
  • 7. The process of claim 1 in which a scale inhibitor is introduced into said well and forced back into said formation after said solvent has been removed from the well.
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