Drilling shaft lining stabilizer

Abstract

The invention discloses a boring well wall stabilizer which is mainly used for solving the technical problem that storage layer is damaged due to unstable well wall and expansion of clay during the boring process; the well wall stabilizer consists of 20-35 parts of diallyldimethylammonium chloride, 2-5 parts of diallyldimethylammonium chloride-acrylamide polymer, 1-5 parts of non-ionic surfactantOP-10, 1-2 parts of fluoride-bearing alkyl ethoxy ether alcohol non-ionic surfactant, 1-3 parts of cellulose, 1-5 parts of KCl and 45-74 parts of water, according to the weight parts. The stabilizer can stabilize the well wall, greatly reduces the expansion rate of the clay at storage layer and eliminates the damages on the storage layer.

Description

A drilling hole wall stabilizer technical field The invention belongs to the technical field of well completion engineering, and in particular relates to a drilling well wall stabilizer suitable for stabilizing the well wall, preventing clay expansion and eliminating reservoir damage during the well completion process. Background technique Oilfields use drilling fluid to clean and cool the drill bit during the drilling process, as well as to carry cuttings, rocks, soil or sand loosened by the drill bit. In addition, the drilling fluid can also reduce formation damage. Lining or smearing to prevent subsidence and by using drilling fluids to prevent the invasion of liquid and solid particles into permeable formations. However, in many areas, shale is sensitive to water and is unstable in the presence of water, so it swells or disperses when it encounters water. As a result, the cuttings are broken into smaller particles. At this time, the broken particles must be separated ...

AI Technical Summary

Problems solved by technology

At present, bromine salt and calcium salt completion fluids are widely used, and bromine salt and calcium salt completion fluids are easy to interact with underground fluids, including oil, natural gas, groundwater, seawater for well washing, carbon dioxide, etc. more damage