Rotational flow rotation deoiling method and device for oil-based mud rock debris

Patent metadata

Field	Value
Publication number	US-12017937-B2
Application number	US-201817275234-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Sep 12, 2018
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

Disclosed is a rotational flow rotation deoiling method for oil-based mud rock debris. The method comprises the following steps: (1) System viscosity control, wherein by means of heat exchange between a gas medium and the rock debris, the viscosity of the oil-based mud debris is reduced to reduce the interaction force between oil, water, and the surface and channels of solid particles, thereby facilitating the separation in a rotational flow field; (2) Rotational flow rotation deoiling, wherein the oil-based mud rock debris particles undergo a coupled motion of rotation and revolution, wherein by means of the rotation of the rock debris particles, the centrifugal desorption of oil on the surface of a solid phase, oil in capillaries and oil in pores is enhanced; and by means of the centrifugal force of periodic oscillation generated by the revolution thereof, the separation and enrichment of oil and gas and the solid phase are completed, thereby achieving the removal of the oil phase from the pore channels of the rock debris; and (3) gas-liquid separation and reuse, wherein an oil-containing mixture produced in step (2) is subjected to gas-liquid separation so as to realize the reuse of a base oil, circulation of the gas medium, and a harmless treatment of the rock debris; and a rotational flow rotation deoiling device for oil-based mud rock debris is further comprised.

First claim

What is claimed is:

1. A method for deoiling of oil-based mud cuttings by cyclone rotation, comprising
(1) Control of system viscosity: reducing viscosity of oil-based mud cuttings by heat exchange between a gas medium and the cuttings to reduce interaction force of oil and water with solid particle surfaces and pores, thereby facilitating separation in a cyclone field;
(2) Cyclone rotation deoiling: among a coupled motion of rotation and revolution of oil-based mud cuttings particles in the cyclone field, using the rotation of the cuttings particles to promote centrifugal desorption of solid surface oil, capillary oil and pore oil, and using a periodically oscillating centrifugal force generated by the revolution to accomplish separation and enrichment of oil, gas and solid phases, thereby achieving removal of an oil phase from the pores of the cuttings; and
(3) Gas-liquid separation and reuse: performing gas-liquid separation on an oil-containing mixture produced in step (2) to realize reuse of base oil, circulation of the gas medium, and harmless treatment of the cuttings.

2. The method of claim 1 , wherein in step (1), the control of the system viscosity is carried out in the cyclone field, wherein a turbulent flow field in the cyclone field is utilized to promote heat exchange efficiency between the gas medium and the oil based mud cuttings, so as to raise liquid temperature, thereby reducing the viscosity.

3. The method of claim 1 , wherein in step (1), the control of the viscosity is carried out at an operating temperature ranging from 70° C. to 200° C., depending on the formulation of the oil based mud cuttings, and lower than a rated use temperature of the oil based mud cuttings.

4. The method of claim 1 , wherein in step (1), the gas medium includes air, nitrogen, supercritical carbon dioxide gas, hydrogen, dry gas, gas from a low pressure separator, and tail gas from natural gas combustion.

5. The method of claim 1 , wherein in step (2), the oil-based mud cuttings particles have the coupled motion of cyclone revolution and particle rotation in the cyclone field; the rotation has a speed of at most 5000 revolutions/second; and a residence time is 2-10 seconds.

6. An apparatus for deoiling of oil-based mud cuttings by cyclone rotation, comprising:
a gas feeding system ( 1 ) and a gas heating system ( 2 ) connected to the gas feeding system ( 1 ) for heating a gas medium;
a cyclone separator set ( 3 ) connected to the gas heating system ( 2 ) for deoiling of waste oil-based mud cuttings by cyclone rotation; and
a gas-liquid separation and reuse system ( 4 ) connected to the cyclone separator set ( 3 ) for separating, circulating and reusing an oil-containing mixture exiting an overflow port of the cyclone separator.

7. The apparatus of claim 6 , wherein the apparatus further comprises: a conveying system ( 5 - 1 ) connected to the gas heating system ( 2 ) for conveying the waste oil-based mud cuttings to be treated; a conveying system ( 5 - 2 ) connected to the cyclone separator set for conveying the waste oil-based mud cuttings which have been treated; and a cuttings tank ( 6 ) connected to the conveying system ( 5 - 2 ) for storing the waste oil-based mud cuttings which have been treated.

8. The apparatus of claim 6 , wherein the cyclone separator set ( 3 ) is a combination of 1-10 cyclone separators in series, and can be connected in parallel in multiple stages depending on treatment load.

9. The apparatus of claim 6 , wherein the cyclone separator set ( 3 ) is assembled by installing the cyclone separator(s) in a normal arrangement, installing the cyclone separator(s) in an inverted arrangement, or installing the cyclone separators in a combination of a normal arrangement and an inverted arrangement.

Assignees

• Shanghai Huachang Env Prot Co Ltd
• Univ Sichuan
• Univ East China Science & Tech

Inventors

• Wu Jiwei
• Wang Hualin
• Pan Jiake
• Jiang Xia
• Wang Lixiang
• Huang Yuan
• Li Jianping
• Fu Pengbo
• Lv Wenjie

Classifications

• E21B21/063 Primary

  by separating components · CPC title

• C02F11/13

  by heating · CPC title

• C02F11/127 Primary

  by centrifugation · CPC title

• C02F11/00 Primary

  Treatment of sludge; Devices therefor · CPC title