Combined thermal recovery method for thickened oil reservoir with gas cap

A technology for heavy oil reservoirs and gas caps, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve problems such as low crude oil recovery, save steam, efficiently utilize, and expand the scope of application Effect

Active Publication Date: 2018-11-23
PETROCHINA CO LTD
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Problems solved by technology

[0008] In order to solve the problem of low oil recovery in heavy oil reservoirs with gas cap

Method used

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  • Combined thermal recovery method for thickened oil reservoir with gas cap

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

[0026] A combined thermal recovery method for heavy oil reservoirs with gas caps, in a space rectangular coordinate system with X, Y, and Z axes as coordinate axes, the combined thermal recovery method for heavy oil reservoirs with gas caps comprises the following steps:

[0027] Step 1. Screening suitable heavy oil reservoirs with gas cap;

[0028] Step 2, the stage of deploying vertical wells and horizontal wells three-dimensional combination well groups; along the X-axis direction, the second batch of well groups, the first batch of well groups and the second batch of well groups arranged in sequence of the vertical wells and horizontal well three-dimensional combination well groups, Both t...

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Abstract

The invention discloses a combined thermal recovery method for a thickened oil reservoir with a gas cap. According to the method, heating of the top of an oil layer is achieved through a method of igniting the gas cap, and combustion heat of a top air layer is utilized to heat the whole oil layer, thereby reducing viscosity of crude on the contact face between the gas cap and a thickened oil layerand achieving the cross-well communication between a vertical well and a horizontal well; flue gases produced after combustion further reduces the viscosity of the thickened oil and provides energy to the entire oil reservoir. The combined thermal recovery method for the thickened oil reservoir with the gas cap not only achieves the exploitation of the thickened oil reservoir with the gas cap, but also saves the steam injection amount through the combustion of the gas cap, and entirely improves the comprehensive benefits of the thickened oil exploitation in the vertical well and horizontal well in a steam driving stage.

Description

technical field [0001] The invention relates to the technical field of oil recovery in heavy oil fields with gas caps, in particular to a combined thermal recovery method for heavy oil reservoirs with gas caps. Background technique [0002] The distribution of gas cap heavy oil reservoirs is complex, and the influence of reservoir heterogeneity makes the movement of oil and gas and oil and water more complicated. At present, there is no very effective development method for heavy oil reservoirs with gas cap. If only oil is produced but no gas is produced, the steam injected into the lower oil layer is easily lost to the gas layer, which reduces the development effect of steam injection. If in order to eliminate the hidden dangers of heavy oil production in the later stage, if the gas is produced first and the heavy oil is not recovered, as the pressure decreases, the light crude oil in the heavy oil will invade the gas cap area, so that the density of hydrocarbons in the oi...

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Application Information

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IPC IPC(8): E21B43/24E21B43/243
CPCE21B43/24E21B43/2406E21B43/243
Inventor 周游刘彤张忠义席长丰齐宗耀
Owner PETROCHINA CO LTD
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