SAGD horizontal well concentric pipe steam injection heat transfer method

Abstract

The invention provides an SAGD horizontal well concentric pipe steam injection heat transfer calculation method. An SAGD horizontal well concentric pipe comprises a long pipe, a short pipe, a screen pipe and a sleeve which are concentrically arranged; the long pipe comprises a vertical section and a horizontal section connected with the vertical section; the vertical section is sleeved with the short sleeve, and the short pipe and the long pipe are arranged in a spaced mode; the short pipe is sleeved with the sleeve, and the sleeve and the short pipe are arranged in a spaced mode; and the screen pipe is connected to the end of the sleeve and arranged on the periphery of the horizontal section in a sleeving mode, and the screen pipe and the horizontal section are arranged in a spaced mode. The SAGD horizontal well concentric pipe steam injection heat transfer method comprises the steps that S1, the heat loss in the portion, at the vertical section, of the long pipe and the heat loss in the short pipe are determined; and S2, the heat loss in the portion, at the horizontal section, of the long pipe and the heat loss of the screen pipe are determined. According to the SAGD horizontal well concentric pipe steam injection heat transfer method, the heat transfer loss of steam injected from the vertical section of the long pipe can be determined, and the basis is provided for optimization of the SAGD horizontal well circulating preheating technique and improvement of the development effect.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for steam injection and heat transfer in concentric tubes of SAGD horizontal wells. Background technique [0002] In some oilfields, super-heavy oil has high viscosity, and it is difficult to achieve economical and effective development by conventional thermal recovery technology. Using foreign super-heavy oil development experience for reference, dual-horizontal well SAGD technology is used for development. SAGD development is divided into cycle preheating and production stages. In the cycle preheating stage, steam is injected into production wells and steam injection wells at the same time. The flowing oil reservoir is uniformly heated and communicated. [0003] At present, the SAGD horizontal well circulation preheating in the oil field adopts the steam injection circulation method. The parallel double-tube structure is adopted in the wellbore of most injection-...

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Problems solved by technology

[0006] The current oilfield SAGD using concentric tube steam injection has just entered the experimental stage, and the analytical model for the concentric tube preheating cycle has not yet been established, and there are no related articles in China. It is necessary to calculate and analyze the heat transfer process of the concentric tube cycle preheating stage , helps to optimize the operating parameters in the cycle preheating stage, saves operating costs, and provides a basis for optimizing the SAGD cycle preheating process and improving the development effect

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