Multi-phase flow fidelity sampling device and method based on drilling

A sampling device and drilling technology, applied in the field of formation multiphase fluid sampling and formation multiphase fluid sampling devices, can solve fidelity sampling (only gas-liquid two-phase, liquid can only be single-phase liquid or mixed state) Liquid, can not consider sample sampling, can not consider the proportion of different phase liquids and other issues, to achieve the effect of wide application range, stable system and simple structure

Pending Publication Date: 2019-11-12
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The invention patent "Fidelity sampling device for stratified gas-liquid two-phase fluid in well" (CN 102108861 A) provides a technical method based on downhole gas-liquid two-phase sampling. Although the sampling method can meet the requirements of fidelity sampling, the liquid The phase is a mixed liquid, but it is impossible to sample the multi-phase mixed fluid that is statically separated by gravity (only gas-liquid two-phase, and the liquid can only be a single-phase liquid or a liquid in a mixed state), and the gas in each sampling layer The sampling point of the liquid phase can only be at a certain depth, and the sampling of samples at different depths in the sampling section cannot be considered, nor can the ratio of different phases of liquid in the ground (depth range) and other information be considered.
At the same time, ground equipment needs to be equipped with surface oil-water separation devices, and it is not suitable for more complex underground environments, including gas-water-oil-additive and other multi-phase, gas-liquid and other multi-phase sample sampling analysis

Method used

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  • Multi-phase flow fidelity sampling device and method based on drilling
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  • Multi-phase flow fidelity sampling device and method based on drilling

Examples

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Effect test

example 1

[0075] Take China United Coal Changzi County CO 2 Take the coalbed methane displacement site as an example (the downhole liquid has no oil-water mixture, and the gas samples taken have not been collected for related experiments). The steps are:

[0076]1. Open the pressure source 10 to release the high-pressure relatively inert gas, adjust the fluid pressure reducing valve 12 to the maximum output pressure (the general pressure is about 12Mpa, related to the drilling depth), open the first liquid drive pipe valve 1201, the second liquid drive pipe valve 1201 The valve 1202 and the first liquid sampling pipe valve 1211 inject high-pressure relatively inert gas into the U-shaped liquid sampling pipe 2; the high-pressure relatively inert gas leaves the pressure source 10 and passes through the first driving pipe 11, the first liquid driving pipe 1101, the second The liquid driving tube 1102 is then injected into the downhole control pipeline 21 and sampling pipeline 22 of the U-...

Embodiment 2

[0087] Combine below figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The present invention is further described: a multiphase flow fidelity sampling device for drilling, which includes a surface control system 1, a U-shaped liquid pipe 2, a packer system 3, an I-type gas pipe 4, a porous pipe downhole Liquid sampling system 5, temperature control system 6, automatic multi-way valve 7. The present invention is different from the existing U-shaped tube gas-liquid two-phase sampling device, and adds a ground control system 1 and a porous tube downhole liquid sampling system 5, and is characterized in that: the pressure source 10 and the first drive in the ground control system 1 The pipe 11 and the fluid pressure reducing valve 12 are connected; the control pipeline 21 in the U-shaped liquid taking pipe 2 is respectively connected with the sampling pipeline 22, the ground control system 1, and the liquid sampling pipe 23, and the liquid sampl...

Embodiment 3

[0104] Such as Figure 8 , Figure 9 , Figure 10 In the drilling at a depth of 1000m (underground temperature is about 30°C), the original sampling method and the device and sampling method of the present invention are used to sample, and the stability of the pressure of the underground fluid during the sampling process has been greatly improved. Effective control of fluid external conditions. Its implementation steps are identical with embodiment 1.

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Abstract

The invention discloses a multi-phase flow fidelity sampling method and device based on drilling. The multi-phase flow fidelity sampling device includes a ground control system, a U-shaped fluid taking pipe, a packer system, an I-shaped gas taking pipe, a perforated pipe underground liquid sampling system, a temperature control system and an automatic multi-way valve; and the sampling device relies on a perforated pipe as the core, and can simultaneously separate and sample multi-phase mixed fluid after underground static balance through an underground device. Sampling conditions, the samplingquantity and the depth are controlled by the ground control system and the temperature control system, and it is ensured that the sampling quantity is the volume of the perforated pipe content so asto realize whole section sampling and fidelity sampling. The multi-phase flow fidelity sampling device is suitable for real-time fidelity and fixed depth sampling of gas, water, oil and the multi-phase mixed fluid which are difficult to distinguish in drilling, and also suitable for multi-layer multi-phase fluid sampling. The device has the advantages of simple structure, low cost of long-term use, excellent durability, wide strata application range, and is suitable for multi-phase fluid fidelity sampling of an oil-water-gas system, and wide application prospects are provided.

Description

technical field [0001] The invention belongs to the technical field of fidelity sampling of mixed fluids in deep ground engineering and exploitation of resources such as oil and gas, and more specifically relates to a method for sampling formation multiphase fluids, and also relates to a device for sampling formation multiphase fluids, which is suitable for The subterranean multiphase sampling of the porous pipe sampling container and static equilibrium and the fidelity sampling of the formation multiphase fluid separated from the surface are integrated. Background technique [0002] As the development of oil and gas fields enters the middle and later stages, the water content of the produced fluid is getting higher and higher, and the cost of oil well development is getting higher and higher. Most of the oil and gas fields are high water content oil and gas fields; some oil and gas fields have begun to adopt new technologies, including gas flooding, gas-water Alternate disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/08
CPCE21B49/081
Inventor 魏宁李小春杨列
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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