Composite oil reservoir anti-swelling and sand-inhibiting agent and preparation method thereof

Abstract

The invention relates to a compound oil deposit antiswelling and sand inhibiting agent and a preparation method thereof. The compound oil deposit antiswelling and sand inhibiting agent is prepared from the following raw materials in parts by weight: 20 to 30 parts of epoxy chloropropane-trimethylamine polymers, 20 to 30 parts of cationized polyacrylamide, 20 to 30 parts of poly-dimethyl diallyl ammonium chloride, 37.5 parts of ammonium chloride, 3.75 parts of dibutyl phthalate, 2.27 to 2.75 parts of hydroxyethyl ethylenediamine, 1.0 to 1.25 parts of triethylene tetramine, 5 to 10 parts of graphite powder, 1 to 4 parts of methyl methacrylate, 2 to 5 parts of biuret 2-butoxyethyl acetate, 2 to 5 parts of N-zinc pentamethylene dithiocarba-piperdine complex and 5 to 10 parts of titanate coupling agents. The compound oil deposit antiswelling and sand inhibiting agent is adsorbed on the surface of viscosity particles; a layer of protecting film is formed on the surface, so that the viscosity particles are effectively protected; clay particles are prevented from hydration swelling.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, in particular to a compound anti-swelling and sand-inhibiting agent for oil reservoirs and a preparation method thereof. Background technique [0002] In unconsolidated sandstone formations, loose sand particles may enter the wellbore with the migration of oil and gas. If the flow rate of oil and gas is not enough to bring the sand particles to the ground, the sand particles will gradually accumulate in the wellbore, thereby hindering the flow of oil and gas into the wellbore, resulting in sand in the oil layer. Buried and sand plugged, the production of oil wells is greatly reduced or even shut down. Clay swelling can easily block the wellbore, cause stuck pipe, and cause instability of the wellbore wall. Anti-swelling agents are generally used to deal with the above problems. At present, most of the existing anti-swelling agents are single high-molecular cationic polymers, and the effect ...

AI Technical Summary

Problems solved by technology

Simple superimposed use can not improve the efficiency too much

Other properties of the anti-swelling agent are also limited, unable to meet the needs of production