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A simulation experiment system and method for solidification reformation of weakly cemented hydrate layer

A technology for simulating experiments and hydrates, which can be used in earth-moving drilling, wellbore/well components, construction, etc., and can solve problems such as soft structure, seabed collapse, gas channeling, etc.

Active Publication Date: 2022-03-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The conventional cementing process and cement slurry system cannot guarantee the stability of the weakly cemented hydrate layer, which may easily cause gas channeling caused by hydrate decomposition and affect the cementing quality
Secondly, the formation strength of the weakly cemented hydrate layer is low, the structure is soft, and the curing process of cement slurry may cause marine geological disasters such as seabed subsidence

Method used

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  • A simulation experiment system and method for solidification reformation of weakly cemented hydrate layer
  • A simulation experiment system and method for solidification reformation of weakly cemented hydrate layer
  • A simulation experiment system and method for solidification reformation of weakly cemented hydrate layer

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Embodiment Construction

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0049] Such as Figure 1-13 As shown, this embodiment proposes a weakly cemented hydrate layer solidification transformation simulation experiment system, including:

[0050] The solidified slurry pumping module, the solidified slurry pumping module includes a hydrate model, the hydrate model includes a cavity 13, the cavity 13 is provided with several fluid interfaces 11, and the cavity 13 is also provided with several measuring points 9; the cavity 13 The embedded pipe assembly is connected inside, and one end of the embedded pipe ass...

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Abstract

The invention discloses a simulation experiment system and method for solidification transformation of a weakly cemented hydrate layer, which includes a solidification slurry pumping module and a real-time monitoring module for hydrate formation and decomposition. The model includes a cavity, which has several fluid interfaces and several measuring points; the cavity is connected with a pre-embedded pipe assembly, and one end of the pre-embedded pipe assembly is set in the cavity, and the pre-embedded pipe assembly is arranged from outside to inside Including pre-buried pipe, simulated casing and central oil pipe; hydrate annular core making module, hydrate annular core making module includes gas injection part and liquid injection part. The invention tests the process of hydrate formation and decomposition by means of laboratory condition simulation, thereby realizing the test of the necessary conditions for hydrate formation and decomposition, and fundamentally solving the problem of cementing quality in deep-water weakly cemented formations.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and production, in particular to a simulation experiment system and method for solidification reformation of a weakly cemented hydrate layer. Background technique [0002] Natural gas hydrate is a non-stoichiometric clathrate crystal hydrate formed by one or several hydrocarbon gases reacting with water at a certain temperature and pressure. Its combustion pollution is small and its distribution range is wide, so it is an important gas hydrate in the 21st century. Potentially clean energy. The main components forming gas hydrates are methane and water. [0003] The low temperature of weakly cemented formations in deep water satisfies one of the conditions for the stable existence of hydrates. The conventional cementing process and cement slurry system cannot guarantee the stability of the weakly cemented hydrate layer, which may easily cause gas channeling caused by hydrate decomposit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/005E21B47/001E21B43/01E21B41/00
CPCE21B49/00E21B47/005E21B47/001E21B43/01E21B41/0099
Inventor 柳华杰步玉环霍美桦郭胜来郭辛阳马睿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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