Insatiability emulsification and viscosity system with controlled viscosity and its application in water-driven reservoir

摘要

An in-situ emulsification and viscosity increase system with controllable viscosity consists of the following components in percentage by weight: 0.3˜1.5% of emulsifier, 0.05˜0.5% of ultrafine colloidal particles, 0.01˜0.1% of suspending agent and the balance of mineralized water. The emulsifier is one of or a combination of petroleum sulfonate, petroleum carboxylate, sodium dodecyl sulfate, sodium dodecyl benzenesulfonate, alkyl glycoside, aliphatic alcohol ether carboxylate, aliphatic alcohol ether sulfonate, hydroxysulfobetaine and alkanolamide. The ultrafine colloidal particles are one of ultrafine silicon dioxide, ultrafine montmorillonoid, ultrafine ferric oxide, ultrafine ferroferric oxide, ultrafine aluminum oxide and ultrafine titanium dioxide. The suspending agent is one of partially hydrolyzed polyacrylamide, amylose, carboxymethyl chitosan, hydroxymethyl cellulose, xanthan gum and sodium alginate. The system is applicable to a water-flooding oil reservoir with the viscosity of lower than 50 mPa·s, has a very broad coverage scope and outstanding economic benefits and can effectively promote efficient development of water-flooding oil reservoirs.