The Research Of Acidizing Technology Of Xing Shu-Gang Oil Field

In Xing Shu Gang oil field,high content of clay mineral in low permeability formation cause serious formation damage.Injection wells have problems of little hygroscope thickness and low hygroscope capacity.This work,on the basis of the sensitivity study of low permeability formation and damage characterization of Xing Shu Gang oil field,has summarized CY02 aciding reformation technology of oil formation.The main results and contributions of this paper are as follows:1. On the basis of surveying and analysis on the mineral composing and injected water quality, together with sensitivity study of low permeability formation and damage factors of Xing Shu Gang oil field,we summarized sensitivity characterization and damage characterization,thereby provided the foundation for the research of the acidizing technology.2. Performance of CY02 and has been measured.the experiments indicate that this acid has a remarkable characterization of low damage.lt can increase the penetrability of the matrix and logged matric to 98% and 120% respectively.3. By theoretical calculation, parameters of injection pressure, maximum discharge capacity, injection volume have been decided. Solid temporary plugging agent has been researched, and it's field application technique has been determined.4. 11 wells has been applied with this technique. Total results and single well analysis, economic benefit have been conducted which ensures the feasibility of this technology.Following work has been finished.1. By comparing clay stabilizing agent used in oilfield, we determined NW clay stabilizing agent composed of poly-quaternay amines and inorganic salt.2. TLJ agent made up of Ys and ZBS has superiority on restrain Fe(OH)3 deposition.3. We adopted Darcy seepage formula to decide acidifying radius'to reach max-benefit.4. We 'solved the problem of acid liquid distributary by researching CY-4 temporary plugging agent.This paper also predicts development of technologies of acidification and plugging removal, and gives some suggestions to them.