Multifunctional dynamic pollution evaluation device of coalbed drilling fluid

A pollution evaluation and drilling fluid technology, which is applied in the direction of measuring devices, earthwork drilling, wellbore/well components, etc., can solve the problems of unsatisfactory actual production and single research, and achieve modularization of experimental software, avoiding stress effects, and process flow clear effect

CN101798917AInactive Publication Date: 2010-08-11CNPC DRILLING RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-08-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a multifunctional dynamic pollution evaluation device of coalbed drilling fluid, belonging to the technical field of damage evaluation of coalbed methane drilling fluid. The multifunctional dynamic pollution evaluation device comprises a gas booster pump, a triaxial stress coal core gripper, a measuring axial-loading pump, a gas mass flow meter, a computer acquisition board, a mud container, an oven, a precise advection pump, and the like; wherein the gas booster pump is arranged at the left side of the oven; a gas storage tank, the precise advection pump, the measuring axial-loading pump and the gas mass flow meter are arranged at the lower part of the oven; and the triaxial stress coal core gripper and the mud container are arranged in a working space of the oven. The evaluation device can not only simulate the invasion, the invasion depth and the invasion degree of the drilling fluid to a coal bed under the condition of coalbed true triaxial stress, but also simulates the dynamic pollution process of mud in positive differential pressure, negative differential pressure and balanced drilling process and ensures that the coalbed pollution process is integrated with the percolation test process. The invention solves the problem that the conventional evaluation device can not load different axial loads on three axial directions and has the advantages of convenient operation and standardized experimental data.
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Description

Technical field:

[0001] The invention relates to a multi-functional coal seam drilling fluid for simulating the invasion of coal seam, the depth and degree of intrusion into coal seam by drilling fluid under the condition of true triaxial stress of coal seam, and the research on the anisotropy characteristics of coal seam under various true triaxial stress conditions A dynamic pollution evaluation device belongs to the technical field of coalbed methane drilling fluid damage evaluation testing instruments. Background technique:

[0002] The exploration and development technology of coalbed methane is developed on the basis of the exploration and development technology of conventional oil and gas. brought great economic benefits.

[0003] However, coal seams are very different from conventional oil and gas reservoirs. Potential damage factors of coal seams are as follows: 1. Coal seam pores and fractures develop, and solid and liquid phases in drilling fluid enter deep into ...

Examples

Embodiment Construction

[0017] The multifunctional coal seam drilling fluid dynamic pollution evaluation device consists of a low-pressure pressure regulating valve 1, a gas booster pump 2, a gas high-pressure gauge 3, a high-pressure pressure regulating protection valve 4, a high-pressure pressure reducing valve 5, a back pressure boosting valve 6, and mud pollution Valve 7, low pressure regulating protection valve 8, high pressure boosting valve 9, low pressure pressure reducing valve 10, low pressure boosting valve 11, six-way valve seat 12, inlet pressure gauge 13, axial pressure boosting valve 14, axial pressure gauge 15. Triaxial stress coal core holder 16, outlet pressure gauge 17, metering axial pressure pump 18, back pressure gauge 19, back pressure regulator 20, back pressure valve 21, gas mass flow meter 22, gas-water separator 23. Electronic balance 24, computer acquisition board 25, mud container 26, low-pressure pressure sensor 27, high-pressure pressure sensor 28, oven 29, high-pressure...