Hydrate mining well mechanical screen pipe erosion evaluation simulation system and simulation testing method thereof
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A simulation system and a technology of mechanical screen, applied in the field of simulation system, can solve the problems such as the impact of the anti-erosion performance of the screen tube on the sand retaining effect, the impact of the three-phase flow of the screen tube, etc.
Pending Publication Date: 2018-03-27
QINGDAO INST OF MARINE GEOLOGY
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Problems solved by technology
No matter what natural gas hydrate exploitation method is adopted, the screen may directly face the impact of three-phas
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Embodiment 1
[0044] Example 1. The mechanical screen erosion evaluation simulation system for hydrate production wells has a 1:1 correspondence with the actual construction tools. During the simulation experiment, the system forms a closed high-pressure circulation system with a simulated maximum pressure of 15 MPa, which meets the actual conditions. Simulation of gas hydrate reservoir pressure conditions, such as figure 1 As shown, including downhole subsystem, surface subsystem and data acquisition and analysis subsystem;
[0045] The basic structure of the downhole subsystem is a test well with a depth of 200m, which can meet the full-scale simulation of the actual gas hydrate production well screen conditions, including the simulated wellbore 1 and the simulated tubing 2 set in the simulated wellbore 1, Mechanical screen pipe 3, mechanical screen pipe plugging device 7, oil pipe crossing packer 10, gas-liquid mixer 5, pre-set sand supply device 6, gas separator 4, gas injection pipelin...
Embodiment 2
[0053] Embodiment 2, based on the simulation system described above, the present invention also proposes a simulation test method for evaluating the erosion of mechanical screen pipes in hydrate production wells, including the following steps:
[0054] A. Connect the surface subsystem, downhole subsystem and data acquisition and analysis subsystem, pressurize (15MPa) inside the system through the simulated water injection tank, and keep it for a period of time to verify the tightness of the system;
[0055] B. Carry out mechanical screen pipe working condition simulation, including:
[0056] B1. Start the simulation water injection tank and gas supply recovery tank group, control a certain gas-liquid ratio and gas-liquid injection flow rate, and inject liquid and gas into the gas-liquid mixer from the liquid injection pipeline and gas injection pipeline respectively;
[0057] B2. The gas-liquid mixer fully mixes the gas and liquid, and simulates the erosion process of the mech...
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Abstract
The invention discloses a hydrate mining well mechanical screen pipe erosion evaluation simulation system and a simulation testing method thereof. The simulation system comprises an underground subsystem, a ground subsystem and a data collection analysis subsystem, and can meet the requirement on full-scale simulation of an actual natural gas hydrate mining well screen pipe working condition; a simulation result can be directly used for evaluating a marine natural gas hydrate mining well screen pipe erosion attack condition; screen pipe erosion and actual hydrate production well working conditions are initiatively combined, and a pressure sensor, a pressure difference sensor, an online laser particle analyzer and a well mouth sand discharge concentration measurer are combined, so that a screen pipe erosion condition is monitored in real time; through a simulation experiment, an erosion attack rule of a screen pipe under a hydrate production condition can be obtained, the erosion resistance adaptability of the screen pipe during a hydrate mining process is evaluated, and a data support is further provided for designing a diversion trench of a protection cover outside the natural gashydrate mining well screen pipe, optimizing a screen pipe type, warning risks for a depressurization sand control scheme, and selecting a stored transformed section.
Description
technical field [0001] The present invention relates to the technical field of marine natural gas hydrate resources development engineering, in particular to a simulation system capable of simulating the erosion process of sand control screens in hydrate production well pipes, evaluating erosion parameters, and selecting screens based on erosion simulation results and its Simulation test method. Background technique [0002] Gas hydrate is a natural gas energy source discovered in the 1970s that has existed stably for millions of years. This ice-like solid hydrocarbon-containing compound occurs in the ocean and frozen soil. Countries around the world have launched competitions for the development of natural gas hydrates. At present, several large-scale test productions have been carried out around the world. my country also conducted a test production test for natural gas hydrates in the Shenhu area of the South China Sea in 2017, and obtained 309,000 cubic meters in 60 da...
Claims
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