Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2006-04-18
2006-04-18
Mitchell, Katherine (Department: 3677)
Wells
Processes
With indicating, testing, measuring or locating
C166S294000, C166S293000, C507S141000, C507S136000, C507S276000, C507S110000, C175S040000, C175S065000
Reexamination Certificate
active
07028771
ABSTRACT:
Low concentrations, 1–10% of potassium salt, especially potassium formate, are used in a drilling fluid in oil production. Preferably they are used with guar derivatives, most preferably carboxymethyl hydroxypropyl guar. The concentration of potassium formate is maintained at the desired level by adjusting the potassium formate to maintain a desired Zeta potential in the circulating drilling fluid. The potassium formate/guar derivative composition may be used in the substantial absence of hydrophilic clay additive.
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Hallman John H.
Mackey Rusty R.
Smith Kevin W.
Clearwater International, L.L.C.
Mitchell Katherine
Patterson & Sheridan LLP
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