Oscillatory flow method for improved well cementing

Details Oscillatory flow method for improved well cementing Oscillatory flow method for improved well cementing

1983-10-07

1985-10-22

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166285, 166328, E21B 3316

Patent

active

045482713

ABSTRACT:
The present invention is a method for improving well cementing. A fluid such as drilling mud or preflush fluid is oscillated in the annulus prior to introduction of cement slurry into the annular interval to be cemented. The fluid is oscillated by changing its direction of flow at least twice. The oscillatory flow of the fluid flushes gelled drilling mud and filter cake from the annulus more effectively than conventional unidirectional flow. Following the oscillatory phase, cement slurry is pumped into the annular interval to be cemented, thus displacing the fluid, and is allowed to set. The fluid can be oscillated in the annulus either before or after the cement slurry is introduced into the casing. A selective check valve is also described which permits all fluids to flow in the forward direction out of the casing and into the annulus and which permits all fluids other than cement slurry to flow in the reverse direction out of the annulus and into the casing.

REFERENCES:
patent: 1563520 (1925-12-01), Owen
patent: 1647003 (1927-10-01), Huber
patent: 2675082 (1954-04-01), Hall
patent: 3086592 (1963-04-01), Hoch
patent: 3411580 (1968-11-01), McKinney et al.
patent: 3412795 (1968-11-01), Terry
Haut et al., "Primary Cementing: Optimizing for Maximum Displacement", World Oil, Nov. 1980, pp. 105-116.

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