EFFICIENCY IMPROVEMENT OF ACID TREATMENT OF FORMATION BOTTOMHOLE ZONES COMPLICATED WITH PARAFFIN DEPOSITS

On the basis of field data the authors observe the reduction of acid t reatment efficiency in producing wells with resin-paraffin deposits in bottomhole zones. To study this important practical problem the autho rs carried out a number of original investigations at a specially crea ted formation model. It was shown that combined well treatment by both muriatic acid and hydrocarbon solvents could be very promising. At th e same time it is very important that hydrocarbon solvents dissolve in the acid. Five types of solvents are recommended for industrial use. Field tests of combination of 12% muriatic acid and 12% dimethyle-diox an were carried out. The application of this combination showed improv ement of bottomhole zone treatment efficiency as compared with the use of standard muriatic acid treatment.