Method for measuring oil length and/or oil content of oil-based drilling cuttings and application of method

Abstract

The invention relates to a method for measuring the oil length and / or oil content of treated oil-based drilling cuttings. The method includes the following steps that 1, an organic reagent which does not contain hydrogen atoms is mixed with various types of oil-based drilling fluid base oil with different masses, nuclear magnetic resonance measuring is carried out, and the linear equation that Mi=k*Si+b of the T2 spectrum oil peak area (Si) and base oil mass (Mi) is established; 2, the treated oil-based drilling cuttings are weighed, the mass of the treated oil-based drilling cuttings is recorded as M1, and the treated oil-based drilling cuttings are poured into a vessel; 3, a carbon tetrachloride analytically-pure solution is measured, the volume of the carbon tetrachloride analytically-pure solution is recorded as V1, and the carbon tetrachloride analytically-pure solution is poured into the vessel in the step 2 for extraction; 4, a solution with the volume of V2 is measured from the vessel in the step 3 under the condition that V2<V1 and then is subjected to nuclear magnetic resonance measuring, and the T2 spectrum peak area is recorded as S2; 5, the oil content or oil length of the treated oil-based drilling cuttings is calculated according to a formula. The invention further relates to application of the measuring method.

Description

Technical field [0001] The invention relates to a measuring method in the petroleum field, in particular to a measuring method of oil content and / or oil content. The invention also relates to the application of the measurement method. Background technique [0002] Oil-based drilling fluid is one of the key technologies for unconventional horizontal well drilling. With the continuous increase in the exploration and development of unconventional energy such as shale oil and gas, tight sandstone oil and gas, global drilling fluid services have entered the "oil-based drilling fluid era". Oil-based drill cuttings have been included in the National Hazardous Waste (National Hazardous Waste List, HW08) because they contain pollutants such as petroleum hydrocarbons, heavy metals and organics. If they are directly discharged without treatment, they will cause damage to the surrounding ecological environment. Serious harm. The use and research of oil-based drilling fluids in my country ...

AI Technical Summary

Problems solved by technology

This is because: 1. The well sections using oil-based drilling fluids are unconventional reservoirs with nano-scale pores or igneous formations that are easy to collapse, etc., and PDC drill bits or composite drill bits are often used for drilling. Second, the oil-gas-bearing shale is both a reservoir rock and a source rock. Using pyrolysis technology to measure the remaining oil content of oil-based cuttings will inevitably be affected by the organic matter in the parent rock.

Third, the oil content of oil-based drilling cuttings may be high, but the linear range of quantitative fluorescence is narrow (20mg / l), and it needs to be diluted multiple times or multiple times to be within its linear range before measurement, which will inevitably introduce error, resulting in inaccurate measurement results

Fourth, there are various treatment technologies for oil-based drilling cuttings, including more than ten kinds of physical and chemical treatment, biological treatment, etc., and the existing cuttings oil content measurement technology is not fully applicable

A small number of studies currently address oil cut and / or oil content analysis of oil-based drilling fluids, but not oil cut and / or oil content measurement techniques after oil-based cuttings processing

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