Tokyo Gas Company Limited

Neubrex Co., Ltd.

Research Institute of Innovative Technology for the Earth

Research Institute of Innovative Technology for Th

Ziqiu Xue

Hiromichi Kameyama

Susumu Nishio

Kinzo Kishida

Yoshiaki Yamauchi

Toshifumi Matsuoka

Shinzo Suzaki

Koji Yoshizaki

Distributions of a Brillouin frequency shift and a Rayleigh frequency shift in optical fibers set up in a material are measured from scattered waves of pulse laser light entered into the optical fibers, and distributions of pressure, temperature, and strain of the material along the optical fibers at a measurement time point are analyzed using coefficients that are inherent to the set up optical fibers and correlate pressure, temperature, and strain of material with the Brillouin frequency shift and the Rayleigh frequency shift.

Distribution measurement system for pressure, temperature, strain of material, monitoring method for carbon dioxide geological sequestration, assessing method for impact of carbon dioxide injection on integrity of strata, and monitoring method for freezing using same

In an optical fiber cable that includes an optical fiber core for measuring pressure and a multilayer armor cable for measuring temperature, an annular clearance space having a desired thickness is formed between the optical fiber core and the multilayer armor cable and fixing members for fixing the optical fiber core and the multilayer armor cable are provided at predetermined intervals in the axial direction of the optical fiber cable.

Optical fiber cable, manufacturing method for the same and distributed measurement system

Under a known pressure is externally applied to a reference member to which an optical fiber is fixed, test light is allowed to enter the optical fiber, and at least one of a reference Brillouin measurement for determining a reference Brillouin frequency shift amount based on the Brillouin scattering phenomenon, and a reference Rayleigh measurement for determining a reference Rayleigh frequency shift amount based on the Rayleigh scattering phenomenon is performed. A Brillouin measurement coefficient or a Rayleigh measurement coefficient is determined from these calculation results. An optical fiber is fixed to a sample member, the volumetric change of which is unknown, and the same sample Brillouin measurement or sample Rayleigh measurement is performed to determine the frequency shift amount. The volumetric change of the sample member is determined from the sample Brillouin or the sample Rayleigh frequency shift amount, and from the Brillouin or the Rayleigh measurement coefficient.

Method for measuring volumetric changes of object

There are provided a carbon dioxide storage apparatus and a carbon dioxide storage method which, through direct injection of carbon dioxide into an underground brine aquifer, can store carbon dioxide efficiently in the brine aquifer. A filter formed of, for example, grindstone is provided at a tip portion of an injection well. A pumping apparatus pumps carbon dioxide stored in a carbon dioxide tank. The pumping apparatus feeds carbon dioxide from the carbon dioxide tank into the injection well by means of a pump. In the pumping apparatus, carbon dioxide is held within a predetermined pressure range and a predetermined temperature range. Carbon dioxide is fed through the injection well, and is injected into a brine aquifer. Carbon dioxide injected into the brine aquifer assumes the form of microbubbles.

Device and method for sequestering a substance

A carbon dioxide tank () is connected to a pump device (). The pump device () is joined and connected with an infusion well (), which is a tubular body. The infusion well () extends downward beneath the ground () and is provided so as to reach a saltwater aquifer (). Part of the infusion well () forms a horizontal well () in a substantially horizontal direction. In other words, the horizontal well () is a location in which part of the infusion well () is formed in a substantially horizontal direction within a saltwater aquifer (). The horizontal well () is provided with filters (), which are porous members. For the filters (), for example, a fired member in which ceramic particles are mixed with a binder that binds those particles can be used. Moreover, if the hole diameter for the filters () is small, microbubbles with a smaller diameter can be generated.

Retention device for retained substance and retention method

A filter () is provided at a tip portion of an injection well (). A pumping apparatus () pumps carbon dioxide stored in a carbon dioxide tank (). The pumping apparatus () feeds carbon dioxide from the carbon dioxide tank () into the injection well () by means of a pump. In the pumping apparatus, the pressure and temperature of carbon dioxide are maintained at respective predetermined levels or higher by means of a pressure regulation valve, a temperature regulator, etc., whereby carbon dioxide enters a supercritical state. The carbon dioxide having entered a supercritical state is fed in the direction of arrow A through the injection well (), passes through the filter () provided at an end portion of the injection well (), and is injected into a brine aquifer (). Carbon dioxide injected into the brine aquifer () assumes the form of microbubbles.

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Kizugawa, Japan

Ziqiu Xue