Drilling fluid system name
Acidic gel breaking system for horizontal wells
Matching core finishing agent
Clay stabilizer HCS Acid breaking agent HGB Corrosion inhibitor HCI Water proof lock agent HAR / drag reducer HUL
System characteristics
1、It can relieve the blockage that caused by water-soluble macromolecules in the mud cake near the shaft lining;
2、It can effectively remove the damage that caused by acid soluble heavy weighting materials in the mud cake near the well wall;
3、It has good compatibility with formation fluids and pre operation fluids;
4、The gas-liquid surface tension of the breaker system with the addition of the waterproof lock agent HAR is ≤20mN/m, which can better prevent the water lock damage of the low permeability reservoir;
5、The oil-liquid interfacial tension of the breaker system with the addition of drag reducing agent HUL is<1.0mN/m, which can better reduce the flow resistance of heavy oil and improve the seepage characteristics of heavy oil;
6、The reservoir protection effect is good.
Application situation
Five wells such as PL-24H, FK-11H, FM-31H, Assel-15H and FN-26H in the 3/7 district of Sudan, as well as Jidong oilfield and Xinjiang oilfield have achieved good application results.