Multi-Functional Weighting Agent for Drilling Fluid and Preparation Method Thereof, and Water-Based Drilling Fluid and Use Thereof
AssigneeSouthwest Petroleum University
InventorsYang BAI, Pingya LUO, Yan CHENG, Jinsheng SUN, Guancheng JIANG
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Abstract
The invention relates to the field of drilling fluid, and provides a multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof, wherein the multi-functional weighting agent is an polyacrylamide/modified barium sulfate composite multi-functional weighting agent prepared by sequentially dropwise adding acrylamide and ammonium persulfate to a mixture of modified barium sulfate and deionized water in a presence of an initiator.
Claims20
A multi-functional weighting agent having a composite structure, comprising polyacrylamide, and modified barium sulfate, wherein the modified barium sulfate and the polyacrylamide are in a ratio by weight in a range of from about 4:5 to about 5:2.
(canceled)
The method of claim 16, wherein a weight ratio of the modified barium sulfate A, the modified barium sulfate B and the modified barium sulfate C is (0.4-0.6):(0.4-0.6):1.
Dependencies are inferred from the claim text.