Application of carbon dioxide miscible fracturing technology in block G

Aming at the problems of low permeability, strong water sensitivity, insufficient energy, high freezing point and difficalt development in G fault block at J oilfield, an innovative carbon dioxide miscible fracturing technique is proposed, which is based on the analyses of reservoir characteristics and production dynamic. This technology used carbon dioxide combining with solvent boosting energy storage fracturing to supply formation energy, removed formation blockage by no acid regurgitation and swelling agent, improved low temperature fluidity of crude oil by using pour point depressant, then realized the reservoir reconstruction, increased drainage area, and improved the production. The field tests were carried out with 9 wells in G and L fault blocks. The average daily production after the measures was 4.7-6.5 times higher than before. The successful application of this technology opens a breakthrough to increase the output per well in J oilfield, and provides important technical support and guarantee to increase production for similar unconventional oil and gas reservoirs.