Improved intensified petroleum production method

A technology for oil production and carbon dioxide, which can be used in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., and can solve problems such as unspecified results

Inactive Publication Date: 2002-12-18
THE BOC GRP INC
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[0031] Example

[0032]Three types of oils were studied to investigate the effect of carbon dioxide and nitrogen mixtures on enhanced oil recovery. A simulation method was developed based on Peng-Robinson's equation of state for gas-liquid equilibrium, the Twu model for liquid phase viscosity and the Brock and Bird equation for surface tension in modified form. The three oils used in this study were paraffinic, naphthenic and aromatic. Assuming that the amount of the mixture of carbon dioxide and nitrogen is 1 mole gas / mole oil, since the injection of carbon dioxide is usually performed after the water injection process, or alternately with water injection in the WAG method, a small amount of water is added to this mixture. The amount of water added is based on 20% saturation of the conventional oil. at 1,500-2,500 lb / in 2 The pressure and temperature of 75-200°F were studied.

[0033] figure 1 , 2 and 3 and Tables 1, 2, and 3 give the viscosity of paraffinic, naphthenic...

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Abstract

A method of increasing oil recovery from a subterranean formation is disclosed. Inject a mixed gas containing more than 50 volume percent carbon dioxide and the rest inert gas into the underground rock formation to reduce the viscosity and surface tension of the oil and increase the swelling of the oil. A mixed gas containing more than 60% by volume of carbon dioxide is preferable, and a mixed gas containing more than 70% by volume of carbon dioxide is more preferable.

Description

technical field [0001] The present invention provides methods of enhancing oil recovery from subterranean formations. More specifically, the present invention provides a method of injecting a gas mixture comprising at least 50% by volume carbon dioxide and the balance nitrogen or other inert gas into oil in a subterranean formation. Background technique [0002] The oil or gasoline and any water contained in the oil or the porous rock surrounding the oil or gasoline in the formation is generally under pressure due to the weight of the material lying on them. In doing so, they move to areas of lower and higher pressure, such as wellheads. After some pressure is released, the oil will still flow to the surface, but more slowly. This movement can be facilitated by a mechanical pump, such as the common grasshopper pump. These methods are commonly referred to as primary oil recovery methods. Usually, the primary oil recovery method can only recover less than 50% of the oil in...

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Application Information

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IPC IPC(8): E21B43/16
CPCE21B43/164
Inventor R·拉马钱德伦K·W·林贝奇黄顺成
Owner THE BOC GRP INC
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