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Test method for transport law of hydrate layer output fine sand in gravel layer and test device thereof

A test method and gravel layer technology, which is applied in the field of marine natural gas hydrate resource development engineering, can solve the problems of not considering the migration law of fine sand in the formation of sand control medium at the bottom of the well, and the inability to analyze the law of sand production at the bottom of the well, etc.

Active Publication Date: 2017-07-07
QINGDAO INST OF MARINE GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In this new way we have developed an improved technique that allows us to move or settle finely sized particles into different layers within a sedimentary basin without affecting its properties like porosity. It also provides testing techniques and experimentally-based results on migrating mechanisms between these layers.

Problems solved by technology

This patented describes various techniques related to improving the efficiency of exploring hydrocarbon deposits containing water sulfide gases. These techniques aim to prevent erosion damage when injecting fluids into porous rocks with low permeability zones while also allowing for effective use of finest sands within these strata without causing issues like excessive subsidence. Additionally, the current practice involves evaluating the migration equation of fine grained materials formed around drilling holes in tightly held layers called “gravitational bed” where they may move freely inside pipelines.

Method used

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  • Test method for transport law of hydrate layer output fine sand in gravel layer and test device thereof
  • Test method for transport law of hydrate layer output fine sand in gravel layer and test device thereof
  • Test method for transport law of hydrate layer output fine sand in gravel layer and test device thereof

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Embodiment 1

[0069] Specifically, in the present invention, the test method for the migration law of the fine sand produced in the hydrate layer in the gravel layer includes the following steps:

[0070] (1) Take a one-dimensional non-perforated sand-filling model sub-pipe and a simulated gravel layer sand-filling sub-pipe with openings of the same inner and outer diameters, and put a certain degree of compaction, a certain thickness, and a certain amount of gravel into the gravel filling sub-pipe according to actual needs. The simulated gravel layer is filled with the simulated size, the sub-pipe sampling hole is blocked with a plug, and the pressure measurement hole is installed with a pressure pipe and connected with a high-precision differential pressure sensor. The main function of the pressure induction pipe is to ensure that the differential pressure value measured by the differential pressure gauge is the flow pressure difference inside the filling layer, so as to further avoid the ...

Embodiment 2

[0082] Such as figure 1 and figure 2 As shown, the test method for the migration law of fine sand produced in the hydrate layer in the gravel layer includes the following steps:

[0083] (1) Take the sand filling model to simulate the gravel layer sub-pipe 5, the sub-pipe has a total length of 20cm, fill it with 40-60 mesh filling gravel 6, the thickness of the filling layer is 15cm, compact it with a hydraulic compaction device, and the filling strength is 1.5kg / m ;

[0084] (2) The sand filling model is used to simulate filling formation sand tube pressure measuring holes B1, B2, B3, B4, insert pressure induction pipe 11, and install high-precision differential pressure gauges P1, P2, P3, and plug sampling holes C1~C4 with plugs die;

[0085] (3) Take the sand filling model to simulate the filling formation sand pipe 4, connect it with the sand filling model to simulate the filling formation sand pipe 4 through a quick joint, and use the sand filling model to simulate th...

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Abstract

The invention belongs to the technical field of marine gas hydrate resource development project, and particularly relates to a test method for the transport law of hydrate layer output fine sand in a gravel layer and a test device thereof. A simulated pack stratum sand sub-tube and a simulated pack gravel layer sub-tube are adopted to be connected through a quick connector to form a sand pack model for testing. A shunting steel block is installed at the inlet end, and an online laser particle analyzer and an electronic scale are connected at the outlet end through a porous mesh board. Sampling holes and pressure measurement holes are relatively arranged on the sand pack model. A differential pressure gauge is installed between the two adjacent pressure measurement holes, and all the hardware equipment is connected with a data acquisition and processing module. The change law of the output and the output particle size of the stratum fine sand under the gravel pack condition can be monitored in real time so that the test technology and experimental data support can be provided for the research of the transport mechanism of the fine sand in the pack gravel layer induced by hydrate depressurizing exploitation, and the test method and the test device have an important reference meaning for designing reasonable gravel pack parameters and extending trial exploitation duration.

Description

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Claims

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Application Information

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Owner QINGDAO INST OF MARINE GEOLOGY
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