Preparation and application of chemical plugging gel for casing damage well in Yanchang Oilfield
In view of the increasing number of casing damage wells in Yanchang Oilfield,a plugging gel system suitable for casing damage wells in Yanchang Oilfield was homemade through laboratory experiments,and the polymer and crosslinking agent were optimized.The plugging performance of the gel was further evaluated through the sand filled pipe displacement experiment,and the gel system was tested for casing damage treatment in the field.The results showed that the polymer GX-ZSD-04 had good temperature and salt resistance,and the optimized formulation was as follows:3 000 mg/L polymer GX-ZSD-04+200 mg/L crosslinker XT-5-ZSD-01;The breakthrough pressure of the prepared gel system was 5.02 MPa and the breakthrough pressure gradient was 18.59 MPa/m.After plugging with optimized gel system,the water content of casing loss test well was reduced from 100%to 81.01%,and the plugging effect was good.This study can provide a basis for the application and popularization of gel plug-ging technology in casing damage wells in Yanchang oilfield and similar oilfields.
Yanchang Oilfieldcasing damage wellgelchemical pluggingfield test
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