Huabei Oilfield Exploration Area Jizhong Niudong A Well Carbonate Reservoir Stimulation Technology Research And Application

In Huabei oilfield, heterogeneous reservoirs which are tight reservoirs are widely developed, the stratum energy is low, and the validity period of acid fracturing is short. Especially with the furthering exploration, the low porosity、low/extra-low permeability reservoir and special lithology reservoir are increasing, causing more and more complex situation that the acid fracturing reconstruction technology is facing, and it also demands higher standards for acid fracturing technology, especially for the adaptability of fracturing fluids system.On the basis of the comprehensive evaluation and analysis of e characteristics of acid fracturing fluids system, and tackling key technical problems of reforming technique optimization, the operating range of acid fracturing fluids system is improved. Meanwhile, by fully considering the heterogeneity of the reservoirs in HuaBei oilfield, we focused on the compatible performance and synergistic effect between cleaning acid system and acid systems such as hydrochloric acid, mud acid, and multi-hydrogen acid, improved retardance performance and operating range of hydrochloric acid, mud acid, and multi-hydrogen acid system, in order to make sure they can effectively work during the acid fracturing of heterogeneous reservoirs, especially when carrying proppant.By laboratory formulation studies and experiments of cleaning acid system and the application of field performance, this paper improved acid fracturing fluids system to satisfy mass construction and extensive use. Practices indicate that the cleaning acid fracturing technology which is low damage and effective aim at carbonate rocks. Because of its ultra-low frictional resistance, superior corrosion inhibition and steering function, cleaning acid can effectively prevent acid fluid fingering to high permeability part, increase acid etching operating range, and restrain the migration of clay mineral illite, in order to maintain long-term effective flow conductivity of fissure.