Method of treating an oil or gas well with biodegradable low toxicity fluid system
AssigneeBJ Services Company
InventorsSandra L. Berry, Kay E. Cawiezel
Life of this patent
Estimating the term…
Abstract
A method of treating a well consists of introducing into the wellbore a biodegradable fluid system containing a fatty acid ester, such as methyl soyate. The fluid system may further contain a lactic acid ester, such as ethyl lactate, and/or a nonionic surfactant. The fluid system may be used in displacement, well remediation and stimulation as well as additional, alternative applications such as the cleaning of surface and/or downhole equipment.
Claims21
A method of treating an oil or gas well having a wellbore, well casing, production equipment or recovery equipment which comprises introducing into the wellbore, well casing, production equipment or recovery equipment a microemulsion having a discontinuous phase of a blend of a C1-C4 ester of a C16-C20 fatty acid and an emulsifier.
A method of removing pipe dope, hydrocarbons, drilling muds, hydrogen sulfide, scales, fines, sulfur, heaving oil by-products, water blocks, cement filtrates, kill fluids, paraffins and/or asphaltenes from surface equipment or downhole equipment which comprises introducing onto the surface of the surface equipment or downhole equipment a microemulsion having a discontinuous phase of a blend of a C1-C4 ester of a C16-C20 fatty acid and an emulsifier.
Dependencies are inferred from the claim text.