US 11,905,812 B2 · Intra-layer reinforcement method, and consolidation and reconstruction simulation experiment system and evaluation method for gas hydrate formation

Abstract

An intra-layer reinforcement method, and a consolidation and reconstruction simulation experiment system and an evaluation method for a gas hydrate formation are provided. In the intra-layer reinforcement method, the formation reconstruction and fracturing grouting reinforcement technologies are combined; a fracturing grouting process is adopted to create fractures in the gas hydrate formation; and a consolidation liquid enters the fractures and penetrates into the formation through a pressure difference to form a reinforcement with a ribbed slab structure and a specified strength and permeability, which supports the formation to achieve collapse prevention and sand prevention. A specific consolidation and reconstruction simulation experiment system is adopted, where the necessary conditions for the generation and decomposition of a hydrate are tested, and the fracturing, formation consolidation, and cementing experiments are simulated to study a rational exploitation method of a gas hydrate, thereby solving the problem of sand production of the hydrate layer.

A consolidation and reconstruction simulation experiment system for consolidating and reconstructing a gas hydrate formation, comprising:

a consolidation slurry pumping module, wherein the consolidation slurry pumping module comprises a hydrate model;
the hydrate model comprises a cavity body, a plurality of fluid interfaces are formed on the cavity body, and a plurality of measurement points are further arranged on the cavity body;
and a pre-embedded pipe assembly is connected in the cavity body, an end of the pre-embedded pipe assembly is arranged in the cavity body, and the pre-embedded pipe assembly comprises a pre-embedded pipe, a casing pipe, and a central oil pipe from the outside to inside of the pre-embedded pipe assembly;
and
the end of the pre-embedded pipe assembly protrudes into the cavity body, and the pre-embedded pipe assembly comprises a lifting liquid injection port, a consolidation liquid injection port, and a fracturing liquid injection port;
and the lifting liquid injection port, the consolidation liquid injection port, and the fracturing liquid injection port communicate with a lifting pump, a consolidation pump, and a fracturing pump, respectively;
a hydrate annular core making module, wherein the hydrate annular core making module comprises a gas injection part and a liquid injection part;
the gas injection part comprises a high-pressure gas storage tank;
a first end of the high-pressure gas storage tank communicates with a gas cylinder through a gas booster pump, and a second end of the high-pressure gas storage tank communicates with the fluid interfaces through a gas pressure-reducing valve and a gas mass flow controller;
and the liquid injection part comprises a constant-speed and constant-pressure pump, and a liquid communicates with the fluid interfaces through the constant-speed and constant-pressure pump;
a hydrate generation and decomposition real-time monitoring module, wherein the hydrate generation and decomposition real-time monitoring module comprises an outlet separation measurement part and a test part;
and the outlet separation measurement part communicates with the hydrate model, and the test part communicates with the measurement points;
and
an evacuation part for vacuuming, wherein the evacuation part communicates with the hydrate model;
wherein the consolidation slurry pumping module is connected to the hydrate annular core making module via the hydrate model;
and the hydrate model of the consolidation slurry pumping module communicates with the outlet separation measurement part of the hydrate generation and decomposition real-time monitoring module via a line;
wherein the consolidation and reconstruction simulation experiment system is configured to perform a simulation experiment method as follows:
S1:
filling the cavity body with a material, and uniformly applying a layer of petroleum jelly on the pre-embedded pipe;
delivering a lifting liquid by the lifting pump from the lifting liquid injection port to the lifting channel, and allowing the lifting liquid to enter the lifting liquid space through the lifting channel, such that the pre-embedded pipe is lifted;
S2:
after the pre-embedded pipe is lifted, delivering a consolidation liquid by the consolidation pump from the consolidation liquid injection port to the consolidation channel of the central oil pipe, and allowing the consolidation liquid to flow into the cavity body through the one-way valve to realize the cementing of the material in the cavity body;
S3:
after the cementing is completed, delivering a fracturing liquid by the fracturing pump from the fracturing liquid injection port to the fracturing channel, and under an action of the sealing member, allowing the fracturing liquid to enter the cavity body through the perforations to realize the fracturing of the material in the cavity body;
and
S4:
after the fracturing is completed, conducting a corresponding hydrate test through the measurement points.

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Intra-layer reinforcement method, and consolidation and reconstruction simulation experiment system and evaluation method for gas hydrate formation

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Intra-layer reinforcement method, and consolidation and reconstruction simulation experiment system and evaluation method for gas hydrate formation

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Abstract

Claims13