Abstract
In the hydraulic fracturing of the shallow metamorphic formation, an integrated technology was applied to solve the facing realistic problems. This well was drilled into metamorphic rock buried hill in Archean stratum from depth 439.5 m to 729.2 m. In the treatment of this well, we faced with the following problems such as low permeability and porosity (average gas permeability is 0.0015–0.0075 mD, average porosity is 3.5–5.2%), developed natural fracture, high Young’s modulus (56 GPa), high compressive strength (350 MPa), weak shielding function of barriers, high reservoir minimum horizontal stress and high crude oil viscosity (20 mPa.s).
To solve the above problems, the following integrated technologies were applied: (1) Ultra-low concentration (0.2% mass concentration) guar gum fluid was used to reduce formation damage. (2) A hybrid fracturing mode (slickwater + linear glue) was used to connect more natural fracture and build complex fracture networks, slickwater was used to open fracture, linear glue was used to increase net pressure and carry sands. (3) Multi-size sand combination to match different fractures. 70/140, 40/70 and 30/50 mesh sand were used to fill up micro, secondary and main cracks, and the total amount is controlled to avoid plugging. (4) Acid pretreatment to reduce initiation pressure, proppant multi-stage slug to reduce perforations friction and fracture bending friction. (5) Optimize the perforation section in consideration of the ground stress, natural fracture development, well logging and hydrocarbon display. Change the pum** rate during well construction to control fracture height propagation.
In the field practice of this well, 30 m3 quartz sand, 305 m3 treating fluids were pumped into formation. After hydraulic fracturing, oil production rate is 27.96 m3/d, which is remarkably high for shallow wells. Integrated of this hydraulic fracturing design method can be reference for shallow metamorphic rock formation.
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Li, S., He, Cm., Gao, Yb., Li, Y. (2021). Integrated Technology in the Hydraulic Fracturing of the Shallow Metamorphic Rock in Archean Stratum – A Case Study. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_247
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DOI: https://doi.org/10.1007/978-981-16-0761-5_247
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