Method and device for de-oiling oil-based mud rock debris through rotation by rotary flow

Abstract

The invention relates to a method and a device for de-oiling oil-based mud rock debris through rotation by a rotary flow, and provides a method for de-oiling oil-based mud rock debris through rotationby a rotary flow. The method comprises the following steps: (1) system viscosity regulating: through heat exchange between gas media and rock debris, lowering the viscosity of the oil-based mud rockdebris to reduce the interaction between the oil and water and the surface and pore passage of solid particles, thereby facilitating separation in a rotary flow field; (2) de-oiling through rotation by a rotary flow: as a coupling movement of rotation and revolution of oil-based mud rock debris particles exists in a rotary flow field, strengthening the centrifugal desorption of solid-phase surfaceoil, capillary oil and pore oil through the rotation of the rock debris particles, and completing the oil-phase, gas-phase and solid-phase separation and enrichment through a centrifugal force of theperiodic oscillation generated by revolution, so as to realize the oil-phase removal in the pore passages of the rock debris; and (3) gas-phase separating and recycling: conducting gas-liquid separation of the oil-bearing mixture generated in step (2) to realize the recycling of base oil, the circulation of gas media and the harmless treatment of rock debris. The invention also provides a devicefor de-oiling oil-based mud rock debris through rotation by a rotary flow.

Description

technical field [0001] The disclosure belongs to the field of environmental protection treatment of oily solid waste in shale gas drilling, and particularly relates to a method and device for oil-based mud cuttings swirling and deep deoiling, so as to realize the waste oil-based mud rock produced in the shale gas development process Harmless treatment of shavings. Specifically, the present disclosure provides a deep deoiling method and device for oil-based mud cuttings swirling and rotating. Background technique [0002] Oil-based mud is widely used in shale gas drilling due to its advantages in protecting shale gas formations, increasing drilling speed, and effectively preventing borehole wall collapse. The third opening and horizontal section of shale gas wells are usually more than 1500m long, producing a large amount of oil-bearing cuttings (the production volume of a single well is about 250-500m 3 ). The oil content of oil-based mud cuttings is about 10% to 30%. It ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved in this disclosure is: the existing waste oil-based mud cuttings treatment technology is difficult to efficiently separate the oil carried in the pores of cuttings particles, the cost is high, the process is complicated, and secondary pollution is easy to occur

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