Evaluation testing device for anti-sand screen tube blockage characteristic in exploitation process of natural gas hydrate and method thereof

Abstract

The invention discloses an evaluation testing device for an anti-sand screen tube blockage characteristic in an exploitation process of natural gas hydrate and a method thereof. The device comprises atesting device body, a supporting seat, a liquid supplying system, an air supplying system and a fluid leading-out acquisition system. The testing device body is longitudinally mounted on the supporting seat and can longitudinally rotate on the supporting seat. The testing device body comprises a reaction kettle, a constant-temperature clamping jacket, an anti-sand sieve tube module, a pressure sensor, a temperature sensor, a resistivity sensor, etc. The circumferential wall of the reaction kettle is provided with a kettle body interface. The circumferential wall of the constant-temperature jacket is provided with an external interface at a position which corresponds with the kettle body interface. According to the evaluation testing device, the anti-sand screen tube blockage condition indifferent stratum conditions and exploitation conditions and the influence of the stratum factor to screen tube blockage in a sand outlet process can be simulated through experiments; and the screentube blockage characteristic change caused by sand outlet in a hydrate exploitation process can be analyzed through analyzing particle size distribution characteristic, a screen tube sand-blocking medium unit pressure, unit and permeability change.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to an experimental device and an experimental method for evaluating and researching the clogging characteristics of sand control screens caused by sand production in the process of hydrate exploitation in unconsolidated sandstone formations. Background technique [0002] Natural gas hydrate has the characteristics of wide distribution, huge reserves, high energy density and green cleanness. It is a follow-up energy with great potential and one of the important strategic energy. In the process of hydrate production, the mechanical properties of the formation change after the hydrate is decomposed, and the reservoir sand particles are carried by the formation fluid into the wellbore or to the ground, causing a series of problems such as well wall instability, screen blockage, production reduction and formation collapse. The unconsolidated sandstone formation h...

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Problems solved by technology

[0005] The current hydrate experimental research mainly focuses on the design of hydrate production equipment and the conceptual design of sand control methods, and there are few studies on the sand production behavior and sand control screen plugging caused by sand production during the production process.

Most of the existing screen plugging test devices are mainly designed under normal temperature and pressure, which cannot meet the temperature and pressure conditions of hydrate; the hydrate formation area cannot be controlled during the hydrate formation process, resulting in undecomposed hydrate in the simulated part of the screen. It does not conform to the actual situation, which affects the test results; there is no quantitative analysis of the clogging degree, and there is a lack of comparative research on the screen clogging before and after the sand production process; Mechanism Analysis of Corresponding Sand Retaining Medium Permeability Variation

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