Published April 2014
On possibility of using of silicate, alkali and calcium chloride solutions against producing wells drowning
E.G. HajiyevaThe development of new effective overhaul-isolation methods on the basis of easily accessible and inexpensive chemical products for limitation of water flows in flooded producing wells is an urgent task. In connection with this, a great amount of conducted laboratory experiments showed that with the application of solution composition of silicate-alkali and chloride calcium it is possible to increase or restore productivity of early drowned producing wells on oil and limit water content in produced output. It was established that the solutions of silicate-alkali solutions in the ratio of 3:2 and solution of chloride calcium salt in displacement with hard, alkali and produced waters formed under the influence of chemical reaction, amorphous and crystalline sediments are efficient for development of resistant waterproof screen. The affect on the resistance of developed waterproof screen of pressure gradients has been considered. It was revealed that the exceeding of pointed out parameter from 0.02 to 0.08 MPa/m practically does not influence the value of permeability of formation bottom hole zone model. After this, insignificant water permeability increase is observed. It was also defined that 33 % water content in produced output, conducting of isolation measures with solutions of suggested chemical products promotes the water permeability of formation bottom hole zone model. The test of developed method on the basis of silicate, alkali and chloride calcium in flooded by 100 % producing well allowed to increase oil productivity and decrease the produced water content in produced output.
