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Pitshaft sand-carrying law stimulation system and method for ocean natural gas hydrate production wells

A simulation system and natural gas technology, applied in the direction of wellbore/well components, earthwork drilling, production fluid, etc., to achieve the effect of fast testing speed and fast data imaging

Active Publication Date: 2018-05-15
QINGDAO INST OF MARINE GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a wellbore sand-carrying method capable of full-scale natural gas hydrate production wells under different gas-water ratio conditions in view of the urgent demand for fine management of wellbore sand production in my country's marine silty natural gas hydrate exploitation. The simulation system and simulation method for regular indirect visualization research to meet the needs of wellbore sand-carrying capacity analysis for sand production management measures in the production of silty natural gas hydrate

Method used

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  • Pitshaft sand-carrying law stimulation system and method for ocean natural gas hydrate production wells
  • Pitshaft sand-carrying law stimulation system and method for ocean natural gas hydrate production wells
  • Pitshaft sand-carrying law stimulation system and method for ocean natural gas hydrate production wells

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Example 1, a sand-carrying law simulation system in the wellbore of a marine natural gas hydrate production well, including a test well subsystem, a water gas injection subsystem, a separation subsystem, and a wellbore monitoring subsystem. Refer to figure 1 , the test well subsystem includes a simulated wellbore 2 and a simulated casing 5 installed in the simulated wellbore 2, a simulated tubing 6, a gas-liquid mixer 9, an anti-collapse orifice plate 10, a deflector 20, a gas injection pipeline 12 and Water injection pipeline 13; simulated wellbore 2 is a wellbore with a depth of 200m and an inner diameter of 16 1 / 2 The wellhead of the simulated wellbore 2 is equipped with a wellhead blowout preventer 1, and the wellhead blowout preventer is a bridge connecting the test well subsystem, the water gas injection subsystem and the separation subsystem.

[0043] From figure 1 It can be seen from the figure that the simulated tubing 3 is set in the simulated casing 5, wh...

Embodiment 2

[0050] Embodiment 2, based on the simulation system proposed in Embodiment 1, this embodiment proposes a simulation method based on the simulation system of the sand-carrying law in the borehole of an offshore natural gas hydrate production well. The simulation flow chart is as follows Figure 5 shown, including the following steps:

[0051] A. In combination with the gas-liquid ratio conditions of actual hydrate production wells and the size of wellbore tubing, install the device in the simulation well;

[0052] (1) Analyze the possible range of gas-liquid ratio in gas hydrate production wells through productivity simulation, combined with the actual formation clay content, and determine the bottomhole temperature in the natural gas hydrate production well to be simulated according to formation temperature and output fluid simulation ;

[0053] (2) Circularly control the temperature of the high-pressure gas cylinder group and water tank, so that the temperature of the gas an...

Embodiment 3

[0060] Embodiment 3, based on embodiment 1 and embodiment 2, its typical sand-carrying simulation experiment operation process is as follows:

[0061] (1) The simulated wellbore 2 is a standing part in the test well subsystem, which is permanently consolidated with the surrounding stratum through cement, and the bottom of the well is artificially cemented;

[0062] (2) Connect the gas-liquid mixer 9 and the deflector 20 on the ground, test that the solenoid valve F6 is in normal operation, fill the simulated formation sand 11, then place the anti-collapse orifice plate 10 on the top of the simulated formation sand 11, and weld the anti-collapse Collapsing orifice plate 10 and gas-liquid mixer 9;

[0063] (3) Connect the gas-liquid mixer 9 with the gas injection pipeline 13 and the water injection pipeline 12, dock the simulated production casing 5 at the upper end of the gas-liquid mixer 9, and run the above string combination into the At the bottom of the artificial well, th...

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Abstract

The invention discloses a pitshaft sand-carrying law stimulation system and method for ocean natural gas hydrate production wells. The simulation system includes a test well subsystem, a water vapor injection subsystem, a separation subsystem, and a pitshaft monitoring subsystem; the test well subsystem includes a simulation pitshaft and a simulation casing, a simulation oil tube, a gas-liquid mixer, an anti-collapse hole plate, a fluid director, a gas injection pipe channel, and a water injection pipe channel which are arranged in the simulation pitshaft, and a well mouth blowout preventer isarranged on the well mouth of the simulation pitshaft; the water vapor injection subsystem includes a high-pressure gas cylinder group and a water tank, the water vapor injection subsystem is connected with the separation subsystem and the well mouth blowout preventer respectively, and a resistance imager and a capacitive imager are installed in the pitshaft to cooperate with temperature and pressure test data and close and open of a test solenoid valve; quantitative simulation measurements between sand-carrying laws and flow patterns of the natural gas hydrate production wells are achieved,and full-scale indirect visualization researches of the sand-carrying laws of the natural gas hydrate production wells under different gas-water ratio conditions are achieved; the simulation system and method can be used for providing basis for pitshaft flow protection water injection scheme designs of the ocean gas hydrate production wells and meeting the needs of pitshaft sand-carrying ability analysis required by sand management measures in the process of silty natural gas hydrate exploitation.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate resource development engineering, and specifically relates to a simulation system and method capable of visually simulating the law of sand-carrying flow of wellbore fluid in actual marine natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate resource is a kind of clean energy with extremely high energy density. More than 90% of the global deep sea area meets the temperature and pressure conditions for the formation and occurrence of natural gas hydrate. In order to occupy the commanding heights of energy, the exploration and development of marine gas hydrate has become a hot spot in the current international energy competition. More than 90% of natural gas hydrates in sea areas are stored in low-permeability clay or silty clay reservoirs on the seabed. From May 10 to July 9, 2017, my country successfully realized the world's first silty clay reserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B47/001
CPCE21B43/01E21B47/001E21B41/0099
Inventor 李彦龙胡高伟陈强王代刚黄丽刘昌岭万义钊
Owner QINGDAO INST OF MARINE GEOLOGY