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Experimental apparatus and method for researching response characteristic of natural gas hydrate stratum to drilling fluid intrusion

A technology of drilling fluid invasion and response characteristics, which is applied in the direction of measuring devices, material inspection products, suspension and porous material analysis, and can solve problems such as ignoring the impact

Inactive Publication Date: 2012-01-18
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the above experimental devices and methods are that they can only be used for simulation experiments in the process of hydrate production, and ignore the impact of drilling activities and drilling fluid invasion on hydrate formations in the process of hydrate exploration and production.

Method used

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  • Experimental apparatus and method for researching response characteristic of natural gas hydrate stratum to drilling fluid intrusion
  • Experimental apparatus and method for researching response characteristic of natural gas hydrate stratum to drilling fluid intrusion
  • Experimental apparatus and method for researching response characteristic of natural gas hydrate stratum to drilling fluid intrusion

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Embodiment 1

[0054] Embodiment 1: An experimental device for studying the response characteristics of natural gas hydrate formations to drilling fluid invasion according to the present invention, its structure is as follows figure 1 . Including drilling fluid circulation mechanism, test box, core transfer mechanism, gas permeability measurement mechanism, water / gas injection mechanism, ring pressure tracking mechanism, back pressure mechanism, testing mechanism, export metering mechanism, sampling mechanism and industrial computer.

[0055] The drilling fluid circulation mechanism includes a temperature controller 1, a drilling fluid storage tank 2, a drilling fluid circulation pump 61 and a wellhead annular cavity 59 of the physical model mechanism 42, wherein the drilling fluid storage tank 2 has a volume of 1000mL, and the temperature is between room temperature and It is controllable and adjustable between -50°C, the maximum injection pressure of the drilling fluid circulation pump 61 ...

Embodiment 2

[0067] Embodiment 2: The present invention proposes a set of experimental methods for studying the response characteristics of natural gas hydrate formations to drilling fluid invasion based on the application of the experimental device of the above-mentioned embodiment 1. The experimental method for testing the gas permeability of hydrate deposits is divided into It is an experimental method for testing the permeability of hydrate sediments with three different permeability: low, medium and high. The specific operation steps are as follows:

[0068] (1) The steps of the experimental method for permeability testing of low-permeability hydrate sediments:

[0069] a. Water injection: the liquid water in the liquid water storage container 31 is injected into the test rock core 37 in the rock core holder 35 through the advection pump 32 through the piston container A33; the test rock core material adopts a natural rock core with a length of 500mm. The length of 700mm uses a hollow...

Embodiment 3

[0084] Example 3: An experimental method for studying the response characteristics of natural gas hydrate formations to drilling fluid invasion based on the application of the experimental device in Example 1 above, wherein the drilling fluid invades hydrate deposits and the dynamics of hydrate deposits during the invasion process The experimental method steps of response characteristic monitoring are as follows:

[0085] (1) Synthesis of hydrate deposits: the length of the core holder 35 is 1200 mm, and the sand filling model is prepared in advance and placed in the core holder 35 to fill the core holder, using the low permeability of Example 2 Steps a and b in the experimental method for the permeability test of hydrate deposits synthesize hydrate deposits;

[0086] (2) Intrusion of drilling fluid into hydrate deposits: After the drilling fluid in the drilling fluid storage tank 2 is adjusted to 30°C by the temperature controller 1, it enters the wellhead annular cavity 59 o...

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Abstract

The invention relates to an experimental apparatus and a method for researching response characteristics of natural gas hydrate stratum to drilling fluid intrusion. The apparatus comprises a drilling fluid cycling mechanism, a high and low constant temperature experiment box, a gas permeability mechanism, a water / gas injection mechanism, a confining pressure tracking mechanism, a back pressure mechanism, a detection mechanism, an outlet metering mechanism, a rock core transferring mechanism, a sampling mechanism and an industrial control computer. The experimental methods based on the apparatus comprise an experimental method for hydrate deposit gas permeability, an experimental method for intrusion of drilling fluid to hydrate deposit and dynamic monitoring of response characteristics of the hydrate deposit during the intrusion process, and a method for fidelity transferring of hydrate deposit core. The invention provides an early stage indoor research on response characteristics of natural gas hydrate stratum to drilling fluid intrusion, so as to master influence rules of the drilling fluid intrusion on hydrate stratum physical properties, realize simulating fidelity transferring of a sample containing hydrate deposit and provide basis for future hydrate stratum exploitation and drilling safety and logging accuracy interpretation.

Description

technical field [0001] The invention relates to an experimental device and an experimental method for studying the response characteristics of natural gas hydrate formations to drilling fluid invasion. Background technique [0002] Natural gas hydrate has the characteristics of high energy density, wide distribution, and large reserves, and is a new type of alternative energy with great potential. But so far, there are still "three dark clouds" in the sky of hydrate exploration and development and application: insufficient quantitative description of reservoirs, unqualified mining technology and high risk of development and application. Since the gas hydrate formation is a porous medium with permeability, drilling fluid will inevitably exchange energy and matter with it during drilling, which will affect the wellbore stability, logging response and reservoir evaluation. In the case of overpressure drilling and drilling fluid temperature higher than the hydrate phase equilib...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N15/08
Inventor 余义兵宁伏龙蒋国盛张凌刘力王跃伟
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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