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The recovery method of microwave-assisted solvent extraction of heavy oil

An extraction method and microwave-assisted technology, which are applied in the fields of fluid extraction, earth-moving drilling, wellbore/well components, etc., can solve the problems of high resistance to solvent-dissolved oil, slow oil extraction, and low oil production, so as to improve oil production. Effects of velocity and recovery, reduced production costs, high flow capacity

Active Publication Date: 2015-09-09
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solvent extraction technology is essentially a cold recovery technology. Under low temperature conditions, the viscosity of heavy oil is high, the resistance of solvent to dissolve oil is large, and the molecular diffusion coefficient is low. Therefore, the existing low temperature solvent extraction has low daily oil production and slow oil production speed. The investment payback period of mine production is long, which is not conducive to large-scale commercial development

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  • The recovery method of microwave-assisted solvent extraction of heavy oil
  • The recovery method of microwave-assisted solvent extraction of heavy oil
  • The recovery method of microwave-assisted solvent extraction of heavy oil

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Experimental program
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Effect test

Embodiment 1

[0047] The production method of the present invention is explained by taking a certain heavy oil reservoir as an example, but it should be noted that the present invention is by no means limited to the heavy oil reservoir. The reservoir depth is 300m, the crude oil viscosity at the reservoir temperature is 100,000 centipoise, the original average formation pressure is 2.5MPa, and the effective average thickness of oil layer 9 is 15m.

[0048] A. Deploy horizontal injection-production well pattern:

[0049] Such as figure 1 As shown, first, an upper horizontal well (solvent injection well) 11 and a lower horizontal well (production well) 12 are set in the main heavy oil layer 9 of the shallow heavy oil reservoir, and the upper horizontal well 11 and the lower horizontal well 12 are located in the same vertical Plane position;

[0050] During the drilling process, in order to ensure that the vertical distance between the horizontal section of the upper horizontal well 11 and t...

Embodiment 2

[0065] The reservoir depth is 400m, the crude oil viscosity at the reservoir temperature is 200,000 centipoise, the original average formation pressure is 3.5MPa, and the effective average thickness of oil layer 9 is 25m.

[0066] A. Deploy horizontal injection-production well pattern:

[0067] Such as figure 1 As shown, first, an upper horizontal well (solvent injection well) 11 and a lower horizontal well (production well) 12 are set in the main heavy oil layer 9 of the shallow heavy oil reservoir, and the upper horizontal well 11 and the lower horizontal well 12 are located in the same vertical Plane position;

[0068] During the drilling process, in order to ensure that the vertical distance between the horizontal section of the upper horizontal well 11 and the horizontal section of the lower horizontal well 12 is 5-6m, the well trajectory is precisely controlled by magnetic guidance;

[0069] Both the solvent injection well and the production well are completed by conne...

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Abstract

The invention discloses a method for exploiting heavy oil by means of microwave assisted solvent extraction. The method includes steps of arranging a horizontal injection-production well pattern in an exploitation region of a heavy oil reservoir; horizontally and vertically perforating corresponding positions of a horizontal section of an upper horizontal well and an oil layer by a fracturing technology; injecting silicon carbide particles into horizontal and vertical fissures; arranging microwave generating equipment on a wellhead of the upper horizontal well and in the horizontal well and adjusting the power of the microwave generating equipment according to temperature variation of the horizontal section of the upper horizontal well along the horizontal section; injecting light alkane solvents into the upper horizontal well; and continuously exploiting the oil in a lower horizontal production well. The upper horizontal well is a solvent injection well, and a lower horizontal well is the production well. The method has the advantages that the merit of efficient heat-transfer viscosity reduction of the silicon carbide particles which are propping agents in the fissures, the merit of quick oil-solution viscosity reduction of the thermal solvents and the merit of heating quick extraction of the thermal solvents are combined with one another, so that the solvents on a foundation of the large-scale oil layer are quickly heated by microwaves to quickly extract the heavy oil, the exploitation cost of the heavy oil reservoir can be effectively reduced, the oil production speed is increased, and the recovery efficiency is improved.

Description

technical field [0001] The invention relates to a mining method for heavy oil reservoirs in the field of oil mining, in particular to a mining method for microwave-assisted solvent extraction of heavy oil. Background technique [0002] Heavy oil reservoirs refer to oil reservoirs with degassed crude oil viscosity greater than 100 centipoise at formation temperature, which are widely distributed in my country's Liaohe Oilfield, Xinjiang Tuha Oilfield, Karamay Oilfield, etc. There are also huge reserves in Canada, Venezuela and other places abroad According to incomplete statistics, 70% of the world's future exploitable crude oil resources are heavy oil. [0003] The main development technologies of heavy oil reservoirs are water injection development technology, steam injection development technology and air injection combustion oil layer development technology. Among them, the water injection development technology is mainly aimed at heavy oil reservoirs with underground cru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 吴永彬王红庄
Owner PETROCHINA CO LTD
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