Method for determining reverse condensate oil saturation

A determination method and technology of condensate oil, which is applied in the field of determination of inverse condensate oil saturation, can solve problems affecting gas phase and gas well productivity in condensate gas reservoirs, and achieve the effect of reliable principle and broad market prospect

Pending Publication Date: 2021-07-30
PETROCHINA CO LTD
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Problems solved by technology

When the precipitated condensate oil does not reach the critical flowable saturation, it will not flow, but it will affect t...

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  • Method for determining reverse condensate oil saturation
  • Method for determining reverse condensate oil saturation
  • Method for determining reverse condensate oil saturation

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the implementation of the present invention. example, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041]The invention provides a method for determining the saturation of reverse condensate oil, comprising the following steps:

[0042] S101: at T 0 and P 0 Next, a gas condensate sample is injected into the inlet port of the first core to establish irreducible water saturation until the gas condensate sample of the first core is saturated.

[0043] In order to improv...

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Abstract

The invention provides a method for determining reverse condensate oil saturation, which comprises the following steps of: (1) under T0 and P0, injecting a condensate gas sample into the inlet end of a first rock core for establishing bound water saturation until the condensate gas sample of the first rock core is saturated; (2) standing the first rock core, then reducing the pressure at the outlet end of the first rock core, injecting dry gas into the inlet end of the first rock core, and collecting a first outflow sample at the outlet end of the first rock core; (3) obtaining the gas phase permeability of the condensate oil under the average pressure; and (4) according to the corresponding relationship among the gas phase permeability, the gas phase permeability of the condensate oil and the oil saturation, obtaining the reverse condensate oil saturation of the condensate gas sample under the average pressure. The method can be used for determining the reverse condensate oil saturation of the condensate gas reservoir under different pressure conditions in the cyclic gas injection process, and is of great significance to quantitative evaluation of condensate oil loss and the influence of the condensate oil loss on the gas phase flow capacity.

Description

technical field [0001] The invention discloses a method for determining the saturation of reverse condensate oil, which belongs to the field of oil and gas field development engineering. Background technique [0002] Reverse condensate is a common phenomenon in depletion mining of condensate gas reservoirs. During the development of condensate gas reservoirs, as the formation pressure continues to drop, condensate oil will be reversed in the formation to form two phases of gas and liquid, reducing the flow capacity of the gas phase, thereby reducing the recovery factor. At present, most condensate gas fields adopt the method of reinjecting dry gas for gas injection development to keep the formation pressure above the dew point pressure of the system, slow down the precipitation of condensate oil, and increase the recovery factor. However, as the gas field enters the later stage of development, the formation pressure has been significantly lower than the dew point pressure o...

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Application Information

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IPC IPC(8): G01N33/28G01N7/10G01N15/08
CPCG01N33/2841G01N33/2823G01N7/10G01N15/082
Inventor 王子敦王本强陈啸博王勇崔灿赵小军闫炳旭李原杰吴燕赵紫桐陈萍秦骁
Owner PETROCHINA CO LTD
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