A double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft

A technology for long horizontal wells and numerical simulation, applied in wellbore/well components, earthwork drilling, electrical digital data processing, etc., can solve the problems of unusable, predictable, unusable simulation calculations, etc., and achieve the goal of improving the uniformity of heating Effect

Active Publication Date: 2019-04-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the double-pipe model mainly includes two aspects: on the one hand, the double-pipe is equivalent to a single pipe string, which cannot be used for the simulation calculation of parameters such as the long tubing in the horizontal section of the double-pipe and the pressure field and temperature field of the annular space; on the other hand, the current Some models mainly consider the flow and heat transfer of fluid in the wellbore, but the influence of reservoir pressure, temperature, saturation, etc. that change with time during steam injection is not fully considered
[0005] The simultaneous steam injection process of double-pipe SAGD with long and

Method used

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  • A double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft
  • A double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft
  • A double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft

Examples

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Example Embodiment

[0145] Example 1

[0146] A numerical simulation method for uniform steam injection in a double-tube SAGD long horizontal well considering the coupling of reservoir and wellbore, such as Picture 8 As shown, the double-pipe SAGD long horizontal well pair includes steam injection wells and production wells. Both the steam injection wells and production wells are mainly composed of long tubing, short tubing and slotted screens. The long tubing runs to the toe end of the horizontal well. The short tubing is run down to the heel end of the horizontal well. The reservoir conditions when the injection-production well does not start production are the initial formation conditions. During the double-tube SAGD conventional steam injection process, the steam is injected from the heel end of the long tubing to the toe end, passing through the long tubing. The toe end enters the annulus of the horizontal well and flows from the toe end of the annulus to the heel end. The horizontal section o...

Example Embodiment

[0252] Example 2

[0253] As described in Example 1, a double-tube SAGD long horizontal well uniform steam injection numerical simulation method considering the coupling of the reservoir and the wellbore. The difference is that the buried depth of the reservoir is 180m, the reservoir thickness is 20m, the porosity is 0.33, and the lateral permeability It is 2700mD, vertical permeability is 1890mD, original formation pressure is 0.22MPa, original formation temperature is 10℃, oil saturation is 0.75, horizontal section length of horizontal well is 800m, screen inner diameter is 209.1mm, outer diameter is 219.1mm, thermal conductivity coefficient 44.85W / (m·K); short tubing inner diameter 77.9mm, outer diameter 88.9mm, absolute roughness 0.00005m, thermal conductivity 0.8W / (m·K); oil layer thermal conductivity 5.2W / (m·K).

[0254] In Example 2, the double-tube SAGD conventional steam injection model was used to verify the accuracy of the model, and the calculation steps were the same a...

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Abstract

The invention relates to a double-pipe SAGD long horizontal well uniform steam injection numerical simulation method considering coupling of an oil reservoir and a shaft, and the method comprises thesteps: establishing a reservoir internal seepage and heat transfer mathematical model in a three-dimensional three-phase heavy oil reservoir double-pipe steam injection development process from the aspects of mass conservation and energy conservation; And establishing a flowing and heat transfer mathematical model in the wellbore in the steam injection process according to the variable-mass bidirectional convergence flow characteristic of the fluid in the wellbore and the structural characteristics of the slotted screen pipe column. The method is based on pressure and temperature continuity principles. the wellbore model and the reservoir model are coupled; the model is solved by adopting a fully implicit finite difference method and an iteration technology; By means of the model, the distribution rule of parameters such as pressure, temperature, steam inflow and wellbore on-way steam pressure, temperature and dryness at any moment in the simultaneous steam injection process of the double-pipe SAGD long pipe and the double-pipe SAGD short pipe can be predicted, proper steam injection parameters are selected, the stratum heating uniformity degree is improved, and a reasonable development scheme is made.

Description

technical field [0001] The invention relates to a numerical simulation method for uniform steam injection in double-pipe SAGD long horizontal wells considering the coupling of reservoirs and wellbores, and belongs to the technical field of numerical simulation of heavy oil reservoir development. Background technique [0002] Heavy oil reservoirs are one of the most important types of reservoirs in the world. The world's heavy oil (including bitumen, etc.) resources are very rich, accounting for about 70% of the world's total oil resources. my country's heavy oil resources are mainly distributed in Liaohe, Xinjiang, Shengli and other oil fields, with geological reserves of 20.6×10 8 t, a large amount of heavy oil resources need to be exploited urgently. Therefore, at the moment when the development of conventional oil and gas resources is becoming more and more difficult and energy conflicts are becoming more and more prominent, the economical and efficient development of hea...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B43/24
CPCE21B43/2406G06F2119/06G06F2119/08G06F30/20
Inventor 张艳玉李朋孙晓飞张硕李冬冬谢孟珂王朝胡航刘云龙刘泰霖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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