Cementing oil and gas wells
This patent describes a method for cementing a wellbore penetrating an earth formation to which a conduit extends, the wellbore having a space occupied by a fluid composition to be converted to cement for cementing the space to form a seal between spaced apart points in the formation. It comprises providing means for adding cementitious material and a dispersant to the fluid, circulating the fluid and adding the cementitious material and the dispersant to a quantity of the fluid in predetermined proportions to form a settable cement composition comprising a major portion of the drilling fluid in the well as it was drilled; and water; a lesser proportion of dry cementitious material; a minor amount of a dispersant that does not effect a satisfactory set cement within an acceptable time interval; and a compatible accelerator selected from the class consisting of acetic acid; the first four carbon esters thereof; and acedamide and filling the wellbore with the cement composition.
- Assignee:
- Atlantic Richfield Co., Los Angeles, CA (USA)
- Application Number:
- PPN: US 7-556011
- OSTI ID:
- 5679514
- Resource Relation:
- Patent File Date: 20 Jul 1990
- Country of Publication:
- United States
- Language:
- English
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