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Simulation method and device for mud-sand stripping and migration in hydrate reservoirs during depressurization
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A technology for simulating devices and hydrates, applied in measuring devices, testing of machines/structural components, instruments, etc., can solve problems such as inability to meet complex mining methods and failure to consider impacts
Active Publication Date: 2020-06-16
QINGDAO INST OF MARINE GEOLOGY
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[0007] (2) Although some schemes have realized that the sand production mechanism of reservoirs should be explained from the microscopic scale, it is still impossible to discuss the influence of hydrate decomposition on the exfoliation and migration process of mud and sand particles from the perspective of visualization;
[0008] (3) The influence of special reservoir streamline pattern on sand migration in hydrate reservoirs is not considered, which cannot meet complex mining methods, such as sand spalling and start-up pattern description in special seepage areas around hydraulic slots
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Embodiment 1
[0047] Embodiment 1. A simulation device for the stripping and migration of hydrate reservoir mud and sand during depressurization, taking the hydrate depressurization production process as an example, such as figure 1 As shown, the simulation device includes reservoir simulation modules (9-1, 9-2), supply modules (1, 2, 3), pressure control modules (4, 11-1, 11-2, 12-1, 12-2), temperature control module 13 and recovery module (10-1, 10-2), the reservoir simulation module (9-1, 9-2), supply module (1, 2, 3), pressure control module The modules (4, 11-1, 11-2, 12-1, 12-2) and the recovery modules (10-1, 10-2) are all arranged in the temperature control module 13, and the temperature control module 13 is mainly used for Cool down the simulation device to maintain the temperature conditions required for hydrate reservoir simulation;
[0048] continue to refer figure 1 , the reservoir simulation module is used to fill loose sediments, generate hydrate reservoirs and observe the ...
Embodiment 2
[0057] Embodiment 2, during specific implementation, consider the following basic principles:
[0058] (1) Under the condition of the same formation seepage rate, the difference in the degree of convergence of streamlines may lead to changes in the microscopic force balance conditions of particles. Therefore, under the same outlet flow rate (production) condition, the sand production rate of the formation near the wellbore is affected by the flow field around the wellbore or the fracture. Therefore, by controlling the flow boundary of the model, the simulation of the start-up migration process of sand particles under different streamline conditions can be realized;
[0059] (2) The difference in hydrate saturation affects the degree of cementation of mud-sand particles at different positions, and the uneven distribution of hydrate in the reservoir is one of the main factors controlling the uneven sand production position in the formation. Under the same flow rate (production ...
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Abstract
The invention discloses a simulation method and device for stripping and transporting hydrate reservoir sediment during depressurization. The simulation device comprises a reservoir simulation module,a supply module, a pressure control module, a temperature control module and a recovery module. The reservoir simulation module is used for loading loose deposits, forming a hydrate reservoir and observing a sediment stripping initiation process and comprises a microscopic visual module, a pure radial flow reservoir simulation module and a non-radial flow reservoir simulation module. The influences of the different streamline patterns and a hydrate distribution law on the initiation and migration process of hydrate reservoir sands are considered, hydrate reservoirs under different hydrate saturations and different hydrate distribution patterns are prepared through the reservoir, that the hydrate is in an undecomposed state in a subsequent sand production mechanism analysis experiment is guaranteed, a critical pressure drop condition of sand production and an sand production pattern evolution law are discussed, and a technical support is provided for the prediction of a sand productionlaw in an actual production well.
Description
technical field [0001] The invention belongs to the field of marine natural gas hydrate development, and in particular relates to a visual simulation method and system capable of simulating the mesocosmic process of mud-sand spalling and mud-sand migration in the process of hydrate depressurization exploitation under different flow field conditions. Background technique [0002] With the success of my country's first trial production of natural gas hydrate in sea areas, the evaluation and simulation of sand production and its influencing factors in the process of natural gas hydrate production in sea areas has quickly become a domestic research hotspot. The current focus is mainly to answer the law of reservoir mud and sand production during depressurization by means of numerical simulation or experimental simulation. Due to the lack of on-site actual sand production test data, experimental simulation has become the main means for analysis of sand production mechanism and pr...
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