Tag Archives: cementing

For many years, Gilsonite had been recognized by the industry as a solution to shale sloughing, hole enlargement, and borehole instability. In the early 1980s, at the request of American Gilsonite Company, owned by Chevron Corporation, the Chevron Drilling Fluids at the Drilling Technology Center, investigated how Gilsonite works under downhole conditions. A review of […]

Bore-Plate Shale Stabilizer was developed by American Gilsonite Company with three main objectives in mind. These are: excellent shale stability, excellent reaction in a water environment (drilling fluid), and easy dispersability. These objectives were achieved and tested under the guidance of Chevron’s Drilling Technology Center using the O-G-S Downhole Simulation Cell (DSC) in Houston, Texas. First, […]

SUMMARY Test Substance : Bore- Plate Test Species : Brown shrimp (Crangon crangon) Test Type : Acute toxicity. 96 h LC 50 Test Conditions : Semi-static test conditions according to guidelines issued by the Ministry of Agriculture, Fisheries and Food, Burnham-on-Crouch, U. K. Results Test substance : Bore- Plate 96h LC50                95% confidence limits (mg/l) […]

by N. Davis II and C.E. Tooman, Chevron Services Co. SPE Members Copyright 1988, IADC/SPE Drilling Conference This paper was prepared for presentation at the 1988 IADC/SPE Drilling Conference held in Dallas, Texas, February 28-March 2, 1988 This paper was selected for presentation by an IADC/SPE Program Committee following review of information contained in an […]

Sloughing shales or heaving shales were encountered in ATDM Gilsonite Co. operations in the Hackberry Field, La. during the late 1960’s. . Numerous fishing jobs because of sloughing shales plagued drilling operations, and the costs of reaming tight holes and weighting up the drilling fluids raised drilling costs substantially. One of the most common solutions to […]

Tests performed in the O-G-S Downhole Simulation Cell (DSC) using cores of various age and hardness in a Bore-Plate®- treated mud system indicate that Bore-Plate(a patented blend of specially-treated Gilsonite grades and other additives) can reduce the effects of drilling fluid filtrate invasion. In water based mud systems, filtrate invasion can destabilize the shales and cause […]