Oil exploitation method

A technology of oil extraction and production methods, applied in the direction of extraction fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low oil recovery efficiency, achieve the effects of improving oil recovery efficiency, expanding scale, and improving circulation preheating effect

Inactive Publication Date: 2020-07-24
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for oil extraction, to solve the problem of low oil extraction efficiency in the prior art

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Embodiment Construction

[0020] 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 invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] 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.

[0022] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects, ...

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Abstract

The invention provides an oil exploitation method. The oil exploitation method comprises the steps that at least one branch borehole is mounted in at least one side of a main horizontal well boreholeof a gas injection well; steam of first preset pressure and steam of second preset pressure are led into the gas injection well alternatively for preheating, leading of the steam of the first preset pressure continues for first preset time, a steam cavity is formed between a horizontal well in an oil reservoir area and the branch borehole, and after leading of the steam of the first preset pressure continues for the first preset time, the pressure of the steam led into the gas injection well is adjusted to the second preset pressure, and leading of the steam continues for second preset time; and an SAGD production method is adopted for carrying out oil extraction work through the horizontal well. The manner that the first preset pressure and the second preset pressure which are different are led into the gas injection well for circular gas injection can effectively use an oil layer nearby a branch well, the steam cavity scale is expanded, the well group circular preheating effect can be improved, after circular preheating is finished, the well group horizontal segment use degree is 100%, production indexes meet the SAGD production needs, and the oil extraction efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to a method for oil extraction. Background technique [0002] SAGD technology is currently an effective technology for shallow ultra-heavy oil reservoir development in my country, and is especially suitable for the exploitation of ultra-heavy oil and ultra-heavy oil reservoirs with very high crude oil viscosity. The ultra-heavy oil reservoir suitable for SAGD development in Fengcheng has a burial depth of 190m-470m and a reservoir thickness of 8.2-41.5m, of which J 3 q 2 2-1 +J 3 q 2 2-2 Reservoir oil layer thickness 8.5-41.5m, J 3 q 3 The thickness of the oil layer is 8.2-20.2m, the porosity of the oil layer is 28.6-34.7%, and the permeability is 793-2552×10 -3 μm 2 , oil saturation 58.8-76.4%. [0003] The original formation temperature of the reservoir is 18.5-21.4°C, the original formation pressure is 2.1-5.3MPa, and the viscosity of crude oil at 50°C is 2.57-11...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/2406E21B43/305
Inventor 孙新革桑林翔熊志国张洪源蒲德军张家豪李阳张伟陈祥于兵宁朦丁超杨果
Owner PETROCHINA CO LTD
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