Preheating device and method for heavy oil reservoir

A technology of heavy oil reservoirs and preheating devices, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., and can solve the problems of restricting SAGD production of medium-deep heavy oil reservoirs and cycle preheating of medium-deep heavy oil reservoirs. Problems such as difficult realization of heat and limited application range, etc., to achieve uniform, effective and high-speed formation of thermal communication, avoiding the output of steam and heat, and expanding the application range

Active Publication Date: 2019-11-08
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

However, in actual application, steam circulation preheating is only realized in shallow heavy oil reservoirs. For medium-deep heavy oil reservoirs (600-1000m), because the pressure of the reservoir is higher than that of the shallow layer, even if the developed Huff and puff pressure reduction to 3-4MPa, in medium-deep heavy oil reservoirs, it is difficult to achieve self-circulation of high-temperature hot water, that is, it is difficult to realize circulation preheating of medium-deep heavy oil reservoirs, which limits the SAGD of medium-deep heavy oil reservoirs mining
[0008] From the above, it can be seen that when the existing steam-assisted gravity drainage (SAGD) technology is used to develop heavy oil reservoirs, the preheating method for heavy oil reservoirs is uneven, the preheating efficiency is low, and the operation is complicated. Reservoir cycle preheating is difficult to achieve, and the scope of application is limited

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  • Preheating device and method for heavy oil reservoir
  • Preheating device and method for heavy oil reservoir

Examples

Experimental program
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example 1

[0092] An oil reservoir in Xinjiang has a depth of 200m, an oil layer thickness of 10m, an oil layer permeability of 2000md, and an oil layer temperature of 18°C; at the reservoir temperature, the degassed viscosity of crude oil is 500,000mPa.s, the oil saturation is 75%, and the oil layer dip angle is 6°. Circular preheating injection-production parameters: bottom hole dryness 75%, maximum steam injection pressure 2.0MPa. Electric heater parameters: operating temperature 250 ℃, heating power 150KW. Nanofluid parameters: SIC nanoparticles have a diameter of 13nm and a volume concentration of 1.5%.

[0093] 1) Screening according to the characteristics of the reservoir, in line with the screening criteria of steam-assisted gravity drainage: reservoir depth 4m; oil layer plane permeability > 500md, oil layer vertical permeability > 200md; ​​crude oil viscosity > 2000mPa.s ;Oil saturation>50%;Net-to-gross ratio>0.7;

[0094] 2) The horizontal section of the upper horizontal in...

example 2

[0100] In actual reservoir applications, a comparison was made between steam cycle preheating and nanofluid-assisted electric heating preheating start-up methods. Basic reservoir parameters: porosity 30%, oil saturation 75%, permeability 2000md, oil layer thickness 10m, crude oil degassing viscosity at reservoir temperature 500000mPa.s. Circular preheating injection-production parameters: bottom hole dryness 75%, maximum steam injection pressure 4.0MPa. Electric heater parameters: operating temperature 250 ℃, heating power 200KW. Nanofluid parameters: Al2O3 nanoparticles have a diameter of 10nm and a volume concentration of 2%.

[0101] Basic parameters of the well pattern: the length of the horizontal section is 200m, and the distance between the upper and lower horizontal wells is 5m.

[0102] The effect and efficiency of preheating in two ways are compared:

[0103] 1) Conventional cycle preheating for 200 days, heating the formation between horizontal wells to 100°C, co...

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Abstract

The invention discloses a preheating device and method for a heavy oil reservoir. The preheating device includes an upper horizontal injection well and a lower horizontal production well which are arranged on a target position of a heavy oil reservoir to be preheated; an injection pipe of the upper horizontal injection well which is arranged in a vertical section of the upper horizontal injection well and is used for injecting a nanofluid into a horizontal section of the upper horizontal injection well; an electrical heating column of the upper horizontal injection well which is arranged in a horizontal section of the upper horizontal injection well and is used for electrically heating the injected nanofluid; an injection pipe of a lower horizontal production well which is arranged in a vertical section of the lower horizontal production well and is used for injecting a nanofluid into a horizontal section of the lower horizontal production well; an electrical heating column of a lower horizontal production well which is arranged in the horizontal section of the lower horizontal production well and is used for electrically heating the injected nanofluid. The technical scheme can improve the preheating efficiency and evenness of the heavy oil reservoir, can improve the use degree of the horizontal section, can reduce the operation cost and complexity of preheating, and can enlarge the application range of preheating.

Description

technical field [0001] The invention relates to the technical field of heavy oil reservoir development, in particular to a preheating device and method for heavy oil reservoirs. Background technique [0002] Steam-assisted gravity drainage (SAGD) is an effective technical means to develop heavy oil reservoirs. For high-viscosity crude oil that has no flow ability under the original formation conditions, it needs to go through the oil layer preheating stage to realize the thermal communication between injection and production wells. Sufficient preheating of the oil layer is the prerequisite for the realization of gravity drainage. First, the concept of steam-assisted gravity drainage and preheating is introduced as follows, so as to understand the present invention: [0003] SAGD: Using horizontal wells or vertical wells arranged in the reservoir, after continuous injection of steam to form a steam chamber, the viscosity of the crude oil around the steam chamber decreases wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
CPCE21B43/24
Inventor 郭二鹏蒋有伟高永荣王红庄于蓬勃
Owner PETROCHINA CO LTD
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