Device and method for evaluating sand production and sand control in wellbore during hydrate mining by CO2/N2 replacement method

A technology of hydrate and replacement method, which is applied in the direction of production fluid, wellbore/well components, earthwork drilling and production, etc., to achieve the effect of simple device structure, easy operation, important economic value and social benefit

Pending Publication Date: 2019-12-31
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
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Problems solved by technology

[0005] At present, there are few devices that use experimental methods to study the sand production law and sand control effect in hydrate mini

Method used

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  • Device and method for evaluating sand production and sand control in wellbore during hydrate mining by CO2/N2 replacement method

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Experimental program
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Embodiment Construction

[0035] see figure 1 shown, evaluate CO 2 / N 2 The device for wellbore sand production and sand control when the displacement method is used to exploit hydrates includes a high-pressure reactor, a gas injection and liquid injection system, a temperature control system, a gas-liquid-solid separation system, a pressure control system, and a data acquisition system. The high-pressure reactor includes a reaction The kettle body 37, the top cover 31 and the bottom cover 38, and the middle part of the autoclave is equipped with a rigid pipe 34 that runs through the bottom cover 38. The rigid pipe 34 is in a vertical state and is used to simulate a vertical shaft for hydrate mining. The side wall of the reaction kettle body 37 is provided with a gas injection and a liquid injection port. Preferably, the side wall where the gas injection and liquid injection ports are located is in the shape of an annulus, the gas injection and liquid injection ports are located on the outer wall sur...

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Abstract

The invention discloses a device and a method for evaluating sand production and sand control in a wellbore during hydrate mining by a CO2/N2 replacement method. The device for evaluating sand production and sand control includes a high pressure reactor, a gas-liquid injection system, a temperature control system, a gas-liquid-solid separation system, a pressure control system and a data collection system, a rigid tube penetrating through a bottom cover of the high pressure reactor is installed in the middle of the high pressure reactor, the gas-liquid injection system is connected into the high-pressure reactor through a gas-liquid injection port, the pressure control system is used for controlling the axial pressure, the pore pressure and the back pressure in the high pressure reactor, the gas-liquid-solid separation system is used for collecting gas, liquid and solid generated during an experiment, and the data collection system is used for collecting all physical state information.The device is simple in structure, easy and convenient to operate and good in reliability, the sand production condition in the wellbore during hydrate mining by the CO2/N2 replacement method under different geological conditions can be simulated, then a sand production rule in the wellbore during hydrate mining by the CO2/N2 replacement method and the sand control effect after installing different sand control sieves are evaluated, and the technical support is provided for natural gas hydrate exploration and development.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploration and development, in particular to the evaluation of CO 2 / N 2 A device and method for sand production and sand control in a wellbore when the displacement method is used to exploit hydrates. Background technique [0002] Natural gas hydrate (referred to as hydrate) is composed of water and gas (mainly CH 4 ) is an ice-like solid formed under high pressure and low temperature conditions, commonly known as combustible ice. The hydrate is mainly distributed in the seabed and land permafrost areas. It has the characteristics of wide distribution, abundant reserves, and high energy density. It is regarded as the most potential For unconventional energy, my country listed natural gas hydrate as the 173rd mineral on November 16, 2017. [0003] At present, hydrate mining methods mainly include depressurization method, thermal excitation method, chemical reagent method and CO 2 / ...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/01E21B43/08E21B49/00
CPCE21B43/164E21B43/168E21B43/01E21B43/086E21B49/00E21B41/0099Y02P90/70
Inventor 方翔宇宁伏龙张凌王林杰李彦龙刘志超罗强胡维
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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