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Heavy oil reservoir exploitation method

A production method and technology for heavy oil reservoirs, applied in production fluids, earthwork drilling and production, wellbore/well components, etc., can solve problems such as high viscosity of crude oil, low recovery rate, poor connectivity between injection and production wells, etc., to achieve Improve the vertical sweep coefficient, solve the poor connectivity, and improve the effect of single well oil production

Inactive Publication Date: 2017-04-26
PETROCHINA CO LTD
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for mining heavy oil reservoirs to solve the problems of poor connectivity between injection and production wells and low recovery factors in heavy oil reservoirs due to high crude oil viscosity

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Embodiment Construction

[0025] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0027] The invention provides a method for mining heavy oil reservoirs. The production method includes the following steps: setting a vertical well and horizontal wel...

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Abstract

The invention provides a heavy oil reservoir exploitation method. The heavy oil reservoir exploitation method comprises that a vertical well-horizontal well row-column type well net is arranged in the mine section of a heavy oil reservoir the vertical well-horizontal well row-column type well net comprises vertical well rows and horizontal wells which are distributed alternatively, the well spacing a between adjacent vertical wells in each vertical well row is equal, the well spacing b between each vertical well and the adjacent horizontal well is equal, the well spacing c between adjacent vertical wells at two sides of one horizontal well and in adjacent vertical well rows satisfies the formula c= the square root of (a<2> / 4+4b<2>), steam is injected into all vertical wells and horizontal wells, steam huff and puff production is carried out until the stratum temperature reaches the temperature corresponding to the inflection point of a crude oil viscosity-temperature curve, the steam injection intensity of the vertical wells ranges from 100 t / m to 120 t / m, the steam injection intensity of the horizontal wells ranges from 15 t / m to 20t / m, after the steam huff and puff production, the vertical well arranged in the central position is selected as a steam injection well, after the oil layer is ignited, air is injected into the steam injection well, and linear fire flooding production is carried out. According to the invention, problems that in the heavy oil reservoir, the connectivity of injection and production wells is poor, and the recovery ratio is low are solved.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a method for exploiting heavy oil reservoirs. Background technique [0002] So far, steam assisted gravity drainage (SAGD), steam stimulation (CSS) and steam flooding (SF) have become the main methods for recovering heavy oil. Steam-assisted gravity drainage technology is suitable for oil reservoirs with continuous oil layer thickness greater than 15 meters and undeveloped interlayers. Theoretically, the ultimate recovery rate can reach 55% to 60%. The field test carried out by Fengcheng Oilfield shows that due to the high viscosity of crude oil and the large seepage resistance between wells, the cycle preheating stage lasts for a long time and the steam consumption is large; Oil production is lower and oil vapor is lower. Steam huff and puff technology is a mature technology with a wide range of applications, easy operation. However, for heavy oil reservoirs, there are the fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/24E21B43/243
CPCE21B43/305E21B43/24E21B43/243
Inventor 师耀利杨智木合塔尔施小荣刁长军杨柳
Owner PETROCHINA CO LTD
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