A composite sand control agent with high permeability retention rate

Abstract

The invention relates to a composite sand control agent with high permeability retention rate, which is composed of the following components in mass percentage: 7%-10% of modified inorganic silicate, 15%-20% of composite resin, and 5%-20% of cationic polymer. 10%, inducer 10-15%, stabilizer 5-8%, pore-enhancing agent 10-15%, and the balance is water. The composite sand control agent has low cost, simple process and construction, and can realize multi-level sand control such as sand control, sand consolidation, and sand control. Hazardous substances can better solve the sand control problems of oil-water well formations or skeletons in offshore oilfields, fine silt sand, old wells with high water content, and wells with large formation deficit.

Description

technical field [0001] The invention belongs to the field of chemical sand control in the middle and late stages of development, and relates to a composite sand control agent with high permeability retention rate. Background technique [0002] Sand production is one of the main problems affecting the high-speed exploitation of offshore oilfields, which will cause casing damage, sand sticking, low production, increased operation volume, and even stop production and scrapping of oil and water wells. [0003] The commonly used sand control methods include mechanical sand control and chemical sand control. Mechanical sand control has strong adaptability to oil layers, but the sand control effect on fine silt oil layers is not ideal, and there is a problem of complicated workover work in the later stage. In the high-speed exploitation of offshore oilfields, the sand produced in the oil layer may be either filling sand or skeleton sand. The ideal chemical sand control measures sho...

AI Technical Summary

Problems solved by technology

From the analysis of sand production mechanism and actual sand production in oil reservoirs, chemical sand control needs to prevent the expansion of clay silt, prevent the migration of fine sand particles, and prevent the production of coarse grains of skeleton. The current chemical sand control methods are mainly resin liquid sand control, and resin sand control focuses on Skeleton sand consolidation, there are deficiencies in sand suppression and sand control

At the same time, when the underground resin synthesis method is used, because all the injections are monomers, the polymerization reaction is difficult to proceed in a balanced manner underground, and the cross-linking reaction is not complete. After sand control, the consolidation strength cannot reach the sand control standard, resulting in sand control failure or shortened validity period.

When using resin ground synthesis, due to the high viscosity of the resin, organic solvents need to be added, which is costly and polluting. In addition, after adding a curing agent, the reaction speed is fast, and it may start to solidify during the pumping into the formation, thereby blocking the formation

The permeability of most resins decreases seriously after consolidation, and can only maintain 40% to 60% of the original permeability, resulting in reduced production, severe blockage, and no oil output

There are common problems such as short validity period, poor medium resistance and troublesome treatment after sand control failure

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