Filtering coating quartz sand resistant to high temperature and capable of being solidified under low temperature

Abstract

The invention discloses a filtering coating quartz sand resistant to high temperature and capable of being solidified under low temperature, and belongs to petroleum exploitation downhole filling filtration resistance material. The filtering coating quartz sand is characterized in that a group of high polymer organic compounds are smeared on the surface of the quartz sand, the polar activity of the surface of the quartz sand is eliminated, a kind of particle which can keep the quartz sand independent is formed, and the fluidity is better; and the quartz sand is not deformed and degenerated under the high temperature, is not solidified under normal temperature, and is solidified to form a network structure under the low temperature of no less than 45 DEG C. Compared with the prior art, no waste water, waste residues and harmful materials are produced in the production process, and the filtering coating quartz sand resistant to the high temperature and capable of being solidified under the low temperature is safe and environmentally friendly, good in product liquidity is and convenient to construct. The nonpolarity of the surface is achieved, quicksand and clay are not adsorbed, thefilterability is good, the solidification speed is high, and the strength is high. The coating quartz sand is used as pre-filled sand prevention, the drilling operation cycle can be shortened, the cycle of oil outlet after well completion is prolonged, ultrahigh pressure is not required to fracture a harden sand layer during workover, and the workover cycle is prolonged, so that good value of promotion and application is achieved.

Description

technical field [0001] The invention relates to a filter-resistance quicksand material for underground filling of oil production wells, in particular to a filterable coated quartz sand resistant to high temperature and low temperature consolidation. Background technique [0002] In the oil exploration and production of loose sandstone oil layers, the sand production of oil wells is serious, which will quickly block the oil passage, or even block the oil wells, resulting in reduced production or shutdown of the oil wells. Therefore, it is a basic measure to maintain and maintain the normal production of oil wells to prevent and control sand in oil wells in such an environment. The sand control measures in the prior art are mainly realized by filling large quantities of high-pressure quartz sand into the oil-bearing layer or ring filling. However, the surface of quartz sand is polar and active, and the clay and other organic substances in the oil-bearing layer are also polar,...

AI Technical Summary

Problems solved by technology

However, the surface of quartz sand is polar and active, and the clay and other organic substances in the oil-bearing layer are also polar, which is easy to adsorb and bond with the surface of quartz sand, and the permeability of quartz sand decreases rapidly.

After losing the value of maintaining production, it is necessary to restore the production through the workover process of water injection and fracturing and flushing, which wastes a lot of manpower and material resources, and also causes low oil production in the cycle