Theories and Realization Methods of Reinforcement and Anti-Slump and Sand Control in Natural Gas Hydrate Formation

Abstract

The invention belongs to the field of reservoir reconstruction in the natural gas hydrate development process, and in particular relates to the theory and realization method of reinforcement and anti-slump and sand prevention in the natural gas hydrate stratum. The present invention combines stratum reconstruction with fracturing and grouting reinforcement technology, through the fracturing and grouting process, cracks appear in the natural gas hydrate formation, and the solidified liquid enters the cracks and goes deep into the formation through the pressure difference, forming a "rib" structure And it is a reinforced body with certain strength and permeability, which supports and prevents the formation from collapsing and sand. In the present invention, through the analysis of the physical parameters of the target formation, the use of the curing agent system, the regulation of the fracturing construction process and the pumping of the solidification liquid into the formation during the fracturing process, the purpose of strengthening and preventing collapse and sand prevention in the natural gas hydrate formation is realized, forming The reinforced body can be well cemented with the surrounding formation, effectively avoiding sand production caused by hydrate decomposition, and well wall instability caused by formation collapse.

Description

technical field [0001] The invention belongs to the field of reservoir reconstruction in the natural gas hydrate development process, and in particular relates to the theory and realization method of reinforcement and anti-slump and sand prevention in the natural gas hydrate stratum. Background technique [0002] Natural gas hydrate, also known as "combustible ice", is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions, and is generally distributed in deep sea sediments or permafrost in land areas. In 2016, my country included "Test Mining of Hydrate-Commercial Mining of Hydrate" in the "13th Five-Year Plan" national key research and development plan. And on May 18, 2017, the trial mining of combustible ice in sea area was successfully realized for the first time, and the trial mining of natural gas hydrate produced gas continuously for nearly 8 days in the Shenhu sea area of ​​the South China Sea, realizing a...

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Problems solved by technology

However, research on hydrate formation reinforcement is still in the exploratory stage. Relevant research at home and abroad only conducts preliminary studies on formation deformation and destruction during the hydrate mining process through numerical simulation, and has not proposed an effective hydrate formation reinforcement. Anti-collapse method

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