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Foam flooding formation pressure obtaining method and device

A technology of formation pressure and acquisition method, which can be used in earth-moving drilling, fluid extraction, measurement, etc.

Active Publication Date: 2020-03-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it takes a long time to lower the pressure gauge into the well to measure the formation pressure
At the same time, it is necessary to stop the well, which will cause a lot of economic losses.

Method used

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  • Foam flooding formation pressure obtaining method and device
  • Foam flooding formation pressure obtaining method and device
  • Foam flooding formation pressure obtaining method and device

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Embodiment Construction

[0046] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0047] To facilitate understanding, the following briefly introduces the working process of foam flooding. Foam flooding is also called foam flooding, which forms foam at the bottom of the well by injecting foaming agent solution and gas (such as nitrogen, air, etc.) from the water injection well to the bottom of the well. When the foam enters the formation, it will first enter the high permeability layer. Due to the Jamin effect, the flow resistance of the high-permeability layer is gradually increased, prompting the bottom water to enter the pores of the low-permeability layer, and drive out the oil in the pores of the low-permeability layer, thereby increasing the oil recovery.

[0048] figure 1 It is a flowchart of a method for obtaining for...

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Abstract

The invention discloses a foam flooding formation pressure obtaining method. The method comprises the following steps: dividing a wellbore into a plurality of wellbore units with the same length; acquiring foam injection-production parameters; based on the foam injection-production parameters, calculating the upper end pressure and the lower end pressure of each shaft unit section by section fromthe wellhead of the shaft as a starting point according to the following mode until the lower end pressure of the last shaft unit is calculated, and taking the lower end pressure of the last shaft unit as the foam flooding formation pressure. The formation pressure can be quickly obtained in a layer-by-layer calculation mode, so the formation pressure is prevented from being measured in a mode oflowering the pressure gauge in a well shutdown state, and the economic loss and cost are reduced.

Description

Technical field [0001] The invention relates to the technical field of oil field development, and in particular to a method and device for obtaining formation pressure of foam flooding. Background technique [0002] In the process of oilfield development, in order to improve the recovery of formation oil, foam flooding technology is usually used to inject foam flow into the reservoir. The Jiamin effect of the foam under the condition of formation pore throat is used to increase the seepage resistance of formation water in the high-permeability area of ​​the oil reservoir, and force the formation water to enter other areas of the oil reservoir to promote oil seepage, so as to improve oil recovery. Therefore, the effect of foam flooding is directly reflected in the change of seepage resistance in the reservoir with high permeability. Since the higher the seepage resistance in the high-permeability area of ​​the reservoir, the more difficult it is for the formation water in the hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B47/06E21B47/00
CPCE21B43/16E21B43/166E21B47/00E21B47/06
Inventor 程海鹰陈瑜芳章杨闫云贵梁雁滨李冉
Owner PETROCHINA CO LTD