| In YuShuLin 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 YuShuLin oil field,has summarized aciding reformation technology of oil formation.The main results and contributions of this paper are as follows:(1) This paper analyzes reactions between soil acid and sanstone, it includes the reaction of hydrochloric acid and sandstone, and the reaction of hydrofluoric acid and sandstone.(2)Analyzing the reasons for high water injection pressure, it has a great relationship with mineral formation.Determining the mineral composition of the strata through X-ray.(3) It analysises dissolution rate between different acid and sandstone, and identifies the composition of main acid.Filtering aciding additives to determine the initial composition of the acid finally.(4) Comparing the the acidification effects of every acid through flow simulation exper -iment.(5) Studying the temporary blocking agent for Yu Shu Lin oil field, this temporary block -ing agent has the features of a long time and strong pressure.(6) Three wells has been applied by this technique. Total results and single well analysis, economic benefit have been conducted which ensures the feasibility of this technology.This paper has a detailed laboratory analysis, including testing of lon concentration of residual acid,mechanism research of acid injury about Fu yang oil layer ,.By this analysis, we think that this proportion of the acidification formula meets requirement of Fuyang oil field.After acidification,the capacity of water reservoir has increased significantly,but acid injury is controlled well.In the acid site,temporary plugging technology and two levels acidification is applicated,and result is very good. |
PDF Full Text Request