Saltwater and hard water bentonite mud

Details Saltwater and hard water bentonite mud Saltwater and hard water bentonite mud

1982-09-20

1985-02-19

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85P, C09K 702

Patent

active

045004366

ABSTRACT:
A seawater/saltwater or hard water bentonite mud for use in drilling, and process for preparing same, comprising sequentially adding to seawater, to saltwater of a chloride concentration up to saturation, or hard water: (1) a caustic agent; (2) a filtration control agent; and (3) bentonite. The resultant drilling mud meets API standards for viscosity and water loss, and is stable after aging and at temperatures in excess of 100.degree. C.
In another embodiment, the additives are premixed as dry ingredients and hydrated with seawater, saltwater or hard water.
Unlike other bentonite drilling muds, the muds of this invention require no fresh water in their preparation, which makes them particularly useful at off-shore and remote on-shore drilling locations. The muds of this invention using bentonite further require less clay than known saltwater muds made with attapulgite, and provides superior filtration control, viscosity and stability.

REFERENCES:
patent: 2417307 (1947-03-01), Larsen
patent: 2425768 (1947-08-01), Wagner
patent: 2867584 (1959-01-01), Scott
patent: 2868726 (1959-01-01), Brukner et al.
patent: 2923681 (1960-02-01), Hein et al.
patent: 3081260 (1963-03-01), Park
patent: 3360461 (1967-12-01), Anderson et al.
patent: 3985667 (1976-10-01), Gray et al.
patent: 4299710 (1981-11-01), Dupre et al.
Rogers, Composition and Properties of Oil Well Drilling Fluids, Revised Edition, published 1953, pp. 278, 283 and 288.
"Principles of Drilling Fluid Control", (Subcomm. of APIs, Disc. Study Comm.), 12th ed., 1969, pp. 79-80.
"Baroid Petroleum Services Mud Technology Handbook," 1965, pp. 63-69.
"Standard Procedure for Testing Drilling Fluids," API Recommended Practice, 7th ed., pp. 1-35, (1978).

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