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High-water-content compact condensate gas reservoir non-equilibrium phase transition testing method

A condensate gas reservoir, non-equilibrium technology, applied in the investigation phase/state change and other directions, can solve the problem that condensate gas reservoirs are not suitable for high water-cut tight condensate gas reservoirs, cannot show phase state changes, condensate oil saturation and The impact of recovery factors, etc.

Inactive Publication Date: 2017-03-15
PETROCHINA CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the high water-cut tight condensate gas reservoirs contain a large amount of water and the pressure drop funnel is obvious, there is no pressure stabilization stage in the step-by-step depressurization process. The current test methods for condensate gas reservoirs are not suitable for high water-cut tight condensate Gas reservoirs, unable to show the influence of high water cut and tight reservoir characteristics on the phase change, condensate oil saturation and recovery factor of high water cut tight condensate gas reservoirs

Method used

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  • High-water-content compact condensate gas reservoir non-equilibrium phase transition testing method

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Embodiment 1

[0037] This embodiment provides a test method for the non-equilibrium phase transition of dense condensate gas reservoirs with high water content. Taking the non-equilibrium phase transition test carried out in the PVT cylinder as an example, the present invention will be further described in detail, see figure 1 , the method flow is as follows:

[0038] Step 101: preparing fluid samples according to the actual formation conditions of tight gas condensate reservoirs with high water content;

[0039] The prepared fluid samples, including non-aqueous fluid samples or aqueous fluid samples, are designed to compare and show the influence of high water-cut characteristics of reservoirs on the phase state changes of gas reservoirs;

[0040] For conventional gas condensate reservoirs, the water phase does not need to be considered when mixing fluid samples. Under the formation pressure of 34MPa and formation temperature of 78.8°C, the condensate oil content is 250g / m 3 Prepare the n...

Embodiment 2

[0067] This embodiment provides a test method for non-equilibrium phase transition of tight gas condensate reservoirs with high water content. Taking the test of non-equilibrium phase transition in porous media as an example, the present invention will be further described in detail, see figure 1 , the method flow is as follows:

[0068] Step 101: preparing fluid samples according to the actual formation conditions of tight gas condensate reservoirs with high water content;

[0069] The prepared fluid sample is an aqueous fluid sample;

[0070] For tight condensate gas reservoirs with high water content, the water phase should be considered when mixing fluid samples. When the formation pressure is 34 MPa and the formation temperature is 78.8 °C, 3 mol% of water phase components should be added to form high water content fluid samples. For chromatographic analysis, the well fluid composition of the prepared aqueous fluid is shown in Table 2.

[0071] Table 2 The composition o...

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Abstract

The invention discloses a high-water-content compact condensate gas reservoir non-equilibrium phase transition testing method, belonging to the technical field of oil-gas field development. A fluid sample is prepared according to the actual high-water-content compact condensate gas reservoir geologic conditions, and continuous uninterrupted pressure drop non-equilibrium phase transition testing with pressure drop transient variation is carried out; the testing mode is based on the non-equilibrium phase transition theory; non-equilibrium phase transition testing in a PVT cylinder and non-equilibrium phase transition testing in porous media are established, so that the testing mode conforms to the actual exploitation; and thus, the influence of the non-equilibrium phase transition on the condensate oil saturation degree and natural gas / condensate oil recovery ratio can be better acquired, thereby instructing the actual production work.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a test method for non-equilibrium phase transition of tight condensate gas reservoirs with high water content. Background technique [0002] Condensate gas reservoir is a special kind of gas reservoir. In the process of oil and gas reservoir exploration and production practice, after the hydrocarbon gas under high temperature and high pressure conditions deep underground is extracted to the surface, liquid oil will be condensed due to the decrease of temperature and pressure. This kind of gas reservoir is called condensate gas reservoir. High water-cut tight condensate gas reservoirs are one of the existing forms of condensate gas reservoirs, and the study of their phase characteristics is very important for the development of gas reservoirs. [0003] In the existing technology for determining the phase characteristics of condensate gas reservoirs, it is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02
CPCG01N25/02
Inventor 李骞李鹭光钟兵杨洪志徐伟邓惠常程李明秋杨柳
Owner PETROCHINA CO LTD
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