Device and method for measuring sedimentation deformation field of hydrate reservoir

A hydrate and deformation field technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem of inability to obtain deformation change rules, lack of simulation equipment and methods, and inability to measure the characteristics of natural gas hydrate reservoir settlement deformation And other issues

Active Publication Date: 2020-07-14
QINGDAO INST OF MARINE GEOLOGY
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Problems solved by technology

As a result, the subsidence of hydrate reservoirs may lead to a series of engineering geological risks
[0003] For the actual hydrate production process on site, it is impossible to measure the subsidence and deformation characteristics of the actual gas hydrate reservoir. It is an inevitable requirement to predict the risk of hydrate production through laboratory experiments to study the subsidence behavior in the process of hydrate production, but there is currently a lack of corresponding Simulation equipment and corresponding methods
[0004] The traditional method of testing the reservoir deformation field is point measurement, such as using the form of subsidence markers to observe the characteristics of subsidence deformation at a specific point in the reservoir. This point measurement result cannot obtain the deformation change law on the entire sediment depth profile , the concept of "field" canno

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  • Device and method for measuring sedimentation deformation field of hydrate reservoir
  • Device and method for measuring sedimentation deformation field of hydrate reservoir

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Embodiment 1

[0036] Embodiment 1. The present invention proposes a device for measuring the subsidence deformation field of hydrate reservoirs, including four natural gas hydrate reservoir simulation reactor modules, fluid supply and control modules, mining process simulation modules, and optical fiber subsidence field sensing modules. basic module.

[0037] refer to figure 1, the hydrate reservoir simulation reactor module is the core hardware for simulating the natural gas hydrate settlement process, which mainly includes: the reactor body, the water bath circulation refrigeration cavity wrapped around the reactor, and the insulation layer 2 that wraps the water bath circulation refrigeration cavity; The simulated hydrate reservoir sample 5, the overlying formation pressure simulation loading piston 8, the underlying formation stress simulation loading piston 23, the splitter plate 24, and the simulated production well pipe 7 inside the reactor body are respectively installed in the over...

Embodiment 2

[0050] Embodiment 2. On the basis of Embodiment 1, the present invention proposes the following natural gas hydrate reservoir settlement deformation simulation method, which mainly includes the following steps:

[0051] (1) Fiber preparation:

[0052] This step mainly includes two steps of optical fiber gauge factor calibration and pre-stretching.

[0053] Optical fiber strain calibration: Under constant temperature conditions (such as 1°C) required for natural gas hydrate simulation experiments, use a distributed optical fiber calibration system to measure optical fiber axial strain-Brillouin frequency domain drift by loading / unloading step by step The relationship curve between the quantities, the slope of the curve is the gauge factor.

[0054] Optical fiber pre-stretching and plastic sheet installation: In order to expand the test range of the optical cable, the optical fiber is pre-stretched before the optical fiber is installed in the reactor according to the designed t...

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Abstract

The invention provides a device and method for measuring a sedimentation deformation field of a hydrate reservoir. The device for measuring the sedimentation deformation field of the hydrate reservoircomprises a natural gas hydrate reservoir simulation reaction still, a fluid supply and control module, a mining process simulation module and an optical fiber sedimentation deformation field sensingmodule. The device and method are a device and method for simulating the sedimentation deformation field of the hydrate reservoir based on a Brillouin time domain analysis technology, high-pressure and low-temperature conditions under which a hydrate is generated are simulated, and the hydrate-containing simulated reservoir is formed; certain overburden pressure conditions and mining conditions can be simulated, and the sedimentation deformation rule of the hydrate reservoir in the longitudinal direction is observed; and the sedimentation deformation rule of the hydrate reservoir in the longitudinal direction under the condition that a certain uplift pressure exists on an underlying stratum can also be simulated. According to the device and method for measuring the sedimentation deformation field of the hydrate reservoir, simulated measurement of the sedimentation deformation of the deep hydrate reservoir is achieved, the deformation characteristics of the whole deformation field canbe obtained, and the device and the method are of great significance in evaluating the occurrence and development of an engineering qualification risk and the influence of the engineering qualification risk on mining.

Description

technical field [0001] The invention belongs to the field of laboratory experiment evaluation in the hydrate exploitation process, and in particular relates to a device and method for measuring reservoir subsidence law and longitudinal distribution characteristics in the natural gas hydrate exploitation process. Background technique [0002] The subsidence of marine natural gas hydrate mining reservoirs mainly comes from two factors: the lack of formation material and the change of stress state. The material deficit in the formation mainly includes the two factors of hydrate decomposition output and formation sand production, while the change of stress state mainly refers to the reduction of mechanical properties of sediments caused by hydrate decomposition, and the decrease of pore pressure caused by fluid output. The result of the combined effect is the sediment The effective stress experienced increases. As a result, the subsidence of hydrate reservoirs may lead to a ser...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/01
CPCE21B43/01E21B49/001
Inventor 李彦龙吴能友陈强卜庆涛孙建业黄丽万义钊
Owner QINGDAO INST OF MARINE GEOLOGY
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