Difficulties of hydrofracturing in sandstone - experimental study

• Autorzy: Vikram S. , Kumar Dheeraj , Subrahmanyam D. S.

Identyfikatory

DOI

10.46873/2300-3960.1413

• Języki publikacji: EN

Abstrakty

EN

Hydrofracturing in sandstone is not an easy task. Sandstone is porous; fluid dissipation is common hence unable to obtain breakdown pressures in certain flow rates (0.0000005-0.0001 m3/s). The higher flow rate (0.00025 m3/s) is ascertained to determine the fracturing pressures. Due to this, fracture propagation and delineation are observed (Satya Subrahmanyam, 2022) [1]. To enhance, an experimental method is adopted by carrying out 6 Hydrofracturing tests in a borehole comprising sandstone. A high flow rate of 0.00025 m3/s and viscosity 0.001 Pa s is applied. Later, the fracture simulation was run on 12 core samples collected from the same depths in a lab. The fluid flow rates of 0.0000005-0.0000015 m3/s, viscosity 0.27 Pa- second, pore pressure of 4 MPa, confining pressures in vertical-12 MPa and horizontal 6, 18, 24, 30 MPa is applied. The fracture traces and the stress results exhibit a difference of 80°-300° observed in both cases. The major principle stress orientation obtained in the borehole is 20° and 40°. In lab tests with confining horizontal pressures at 6 and 18 MPa, it is 120° and 130°, and at 24 and 30 MPa is 20°. This indicated that there is fracture delineation occurred. It is observed in the higher flow rate and confining pressures.

Słowa kluczowe

EN

high flow rate; hydrofracturing; shut-in pressure; anisotropy; coal reserves; fractured and porous rock mass

PL

wysokie natężenie przepływu; hydroszczelinowanie; ciśnienie zamknięcia; anizotropia; zasoby węgla; górotworu spękanego i porowatego

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2024
• Tom: Vol. 23, iss. 2
• Strony: 160--176
• Opis fizyczny: Bibliogr. 66 poz.

Twórcy

autor

Vikram S.

• Research Scholar, IIT (ISM) Dhanbad, India

• https://orcid.org/0000-0001-7145-7487

autor

Kumar Dheeraj

• Professor, IIT (ISM) Dhanbad, India

• https://orcid.org/0000-0002-0321-056X

autor

Subrahmanyam D. S.

• Scientist, NIRM, India

• https://orcid.org/0000-0003-4549-5193

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