A method for analyzing inorganic substances in wellbore plugs of oil and gas wells

Abstract

The invention provides a method for analyzing inorganic substances in wellbore plugs of oil and gas wells, which comprises the following steps: performing drying treatment and acetone dissolution on samples of wellbore plugs in sequence, and collecting acetone-insoluble substances; performing X-ray diffraction analysis on the acetone-insoluble substances , to obtain the results of X-ray diffraction analysis; perform fluorescence spectrum analysis on the acetone insoluble matter to obtain the results of fluorescence spectrum analysis; according to the results of X-ray diffraction analysis and fluorescence spectrum analysis, determine the composition and content of inorganic substances in wellbore plugs. The method for analyzing inorganic substances in wellbore plugs of oil and gas wells established by the invention can accurately and comprehensively measure the total proportion of inorganic substances in wellbore plugs, the components of inorganic substances and the content of each component, which is the mechanism of wellbore plugging. Provide technical support for research, plug removal mechanism research, plug removal process selection and plug removal fluid optimization, and ultimately achieve low cost and high efficiency of plug removal operations.

Description

technical field [0001] The invention relates to a method for analyzing inorganic substances in wellbore plugs of oil and gas wells, in particular to a method for analyzing and determining inorganic substances in wellbore plugs, and belongs to an experimental method in the field of workover in oil and natural gas development process. . Background technique [0002] Inorganic substances such as scale, formation sand, corrosion products and barium sulfate are the main factors that cause most wellbore blockages. Wellbore blockage will greatly reduce oil and gas production, thereby affecting the development of oil and gas fields and causing huge economic losses. Therefore, preventing wellbore blockage and solving oil well blockage are important issues faced by oil fields. The analysis of the components and contents of wellbore plugs is the premise to study the mechanism of wellbore plugging and unblocking, the basis for solving the wellbore blockage problem, and an important bas...

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Problems solved by technology

[0006] The X-ray diffraction analysis method is mainly carried out in accordance with the Petroleum and Natural Gas Industry Standard SY / T 5163-2010 "X-ray Diffraction Analysis Method for Clay Minerals and Common Non-clay Minerals in Sedimentary Rocks". Although a single X-ray diffraction analysis method can analyze some The composition and content of inorganic substances, but the accuracy and comprehensiveness of the data cannot be guaranteed, and generally need to be combined with other methods

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