| This technology, using compositions based on cellulose ethers, provides an increase of reservoir sweep due to partial or complete blocking of watercut high permeability formations and subsequent redistribution of flood front. Polymer compositions based on ethers, cellulose-methylcellulose, carboxymethilcellulose, oxyethilcellulose, etc. are used to create an impermeable or low permeable barrier to filtration. The technology is used at late stage of development of oil fields, comprising heterogeneous as to permeability, reservoirs. The technology is widely introduced in oil fields of Tatarstan Republic during 10 years. About 2 min. of additionally produced oil has been obtained as a result of introduction. Specific technological efficiency makes up 400-500 t of additionally produced oil per one ton of injected reagent. |
