A kind of bridging plugging slurry and preparation method thereof

Abstract

The invention relates to a bridging plugging slurry in the field of oil drilling plugging and a preparation method thereof. The bridging plugging slurry comprises the following components in parts by weight: 100 parts of water, 1 to 3 parts of gel, 4 to 15 parts of inorganic particle materials, 2 to 8 parts of plant-based hard shell materials, oil-swellable resin 0.5 to 5 parts, 1 to 4 parts of mineral fiber, 1 to 4 parts of sheet material, and 4 to 10 parts of powder material; Combined reaction, rapid thickening of viscosity; the bridging material used has a reasonable particle size, which can effectively seal the lost channel; combined with bentonite slurry, the plugging slurry can effectively seal the lost layer of asphalt-containing cracks of 1 to 5 mm , can effectively displace asphalt, the asphalt displacement rate reaches over 80%, and forms a plugging layer with a strength greater than 8MPa, and a temperature resistance of over 120°C; and the preparation method is simple and easy to operate on site.

Description

technical field [0001] The invention relates to the field of oil drilling plugging, and more particularly relates to a bridging plugging slurry and a preparation method thereof. Background technique [0002] During the drilling process of Yada Oilfield in Iran, some wells experienced severe leakage, and the asphalt in the formation invaded the drilling fluid, which seriously affected the normal maintenance of the drilling fluid performance. When the drilling fluid density is increased to kill the well, it cannot effectively prevent the asphalt from gushing out, but intensifies the amount of asphalt gushing out, and a large amount of asphalt adheres to the drill pipe, resulting in high drilling complexity; The plugging slurry and asphalt have mixed problems, and the plugging effect is not good. For the complex downhole situation caused by asphalt, most foreign countries adopt measures such as filling sidetracking to bypass the asphalt layer, using asphalt inhibitors to impro...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with the publication number CN101435317A provides a formula for pre-crosslinked gel plugging slurry. The formula essentially uses gel for plugging. The plugging slurry has low viscosity and poor temperature resistance, which cannot effectively solve the problem of plugging. The problem of channeling and mixing of slurry and asphalt; the Chinese patent with publication number CN106609132A provides a preparation method and application of a multi-component composite gel plugging agent. The plugging agent integrates gel plugging and bridging plugging, and is essentially a A solidified plugging agent, the gel plays a role of consolidation, the gel and the bridging material work together to seal the lost layer, the effect is good, but its anti-channeling ability is poor, so it is not suitable for asphalt layer plugging