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Method for reducing overflow of steam cavity and preventing top water from moving down in SAGD development process

A development process, steam chamber technology, used in the production of fluids, earthmoving, wellbore/well components, etc.

Active Publication Date: 2021-06-15
PETROCHINA CO LTD
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  • Abstract
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Problems solved by technology

[0008] In order to solve at least one of the above technical problems, the present invention provides a method to reduce the overflow of the steam chamber and prevent the top water from running down during the SAGD development process, so as to prevent the rapid burst of the steam chamber in a certain area due to improper operating pressure of the steam chamber and cause top water channeling phenomenon

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  • Method for reducing overflow of steam cavity and preventing top water from moving down in SAGD development process
  • Method for reducing overflow of steam cavity and preventing top water from moving down in SAGD development process
  • Method for reducing overflow of steam cavity and preventing top water from moving down in SAGD development process

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[0116] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0117] The present invention provides an example here to optimize the operating pressure of the SAGD steam cavity in a top water reservoir for the Guantao oil layer in a certain block of Liaohe Oilfield, so as to prevent the phenomenon of top water channeling downward due to improper operating pressure of the steam cavity. Specifically include the following processes:

[0118] S100. Determine the current spatial development form of the steam cavity.

[0119] In general, due to the different well layout and production time of SAGD production wells in the reservoir, the development height of the steam chamber of each well...

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Abstract

The invention discloses a method for reducing overflow of a steam cavity and preventing top water from moving down in the SAGD development process. The method comprises the following steps of S100, determining the spatial development form of the current steam cavity; S200, determining main factors influencing the intrusion rate of the top water; S300, establishing a mathematical model of the rate of moving down of the top water by using the main factors determined in S200, and calculating the flow of water and oil under the current asphalt shell thickness; S400, evaluating the packing capacity of a top asphalt shell; S500, evaluating the influence of the pressure difference between the steam cavity and a top water layer on the intrusion rate of the top water; S600, establishing a technical boundary for preventing the top water from moving down. The pressure difference between the steam cavity and the top water layer needs to be controlled to reduce the risk that the top water moves downwards, and the SAGD production effect is guaranteed. Therefore, the development and production period of a top water reservoir is prolonged, and the final recovery efficiency of the reservoir is improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for reducing overflow of a steam chamber and preventing top water channeling during SAGD development. Background technique [0002] Super heavy oil SAGD development technology is a cutting-edge technology for super heavy oil development. The production mechanism is to inject high-quality steam into the steam injection well, and the steam will cover the formation upward to form a steam chamber, which expands upward and sideways, and exchanges heat with the crude oil in the oil layer, and the crude oil and steam after being heated and reduced in viscosity Condensed water is released to the horizontal production well below by gravity, and the steam chamber continues to expand to occupy the volume of crude oil. This technology was invented by Dr. Butler in 1978 (Written by Butler RM. See Wang Bingzhang and other translations. Thermal extraction technology...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B49/00
CPCE21B43/2406E21B49/00
Inventor 王中元葛明曦才业韩冰尚策张甜甜邹兆玉李晓漫高飞平原毓马凤刘雪梅王秀清刘军
Owner PETROCHINA CO LTD
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