Iron sulphide scale removal from oil and gas wells using green formulation
AssigneesQatar Foundation for Education, Science and Community Development, Qatar University
InventorsMusa Ahmed, Ibnelwaleed Ali Hussein, Abdulmujeeb Onawole, Mohammed A. Saad
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Abstract
New formulation for pyrite scale removal from oil and gas wells and a method of pyrite scale removal are disclosed. The chemical formulation is composed of K2B4O7-4H2O, in a concentration of about 9-20 wt. % of the composition, preferably about 14 wt. % of the composition. The new formulation has the ability to dissolve pyrite without generation of the toxic H2S. Furthermore, the new formulation is cheaper and has very low corrosion rate compare to 15 wt. % HCl with corrosion inhibitor. The disclose method uses the disclosed new formulation to dissolve iron sulphide scale, performed at about 100-150° C. and about 500-2000 psi.
Claims13
A composition for iron sulfide scale removal, the composition consisting essentially of a potassium tetraborate tetrahydrate (K2B4O7-4H2O), wherein the potassium tetraborate tetrahydrate (K2B4O7-4H2O) is in a concentration of about 9 wt. %-20 wt. % of the composition.
A method comprising:
- providing a composition consisting essentially of a potassium tetraborate tetrahydrate (K2B4O7-4H2O), wherein the potassium tetraborate tetrahydrate (K2B4O7-4H2O) is in a concentration of about 9 wt. %-20 wt. % of the composition;
- and
- using the composition to dissolve iron sulphide scale.
Dependencies are inferred from the claim text.