Prediction Method of Crude Oil Viscosity in Complex Fault Block Heavy Oil Reservoir

Abstract

The present invention provides a method for predicting the viscosity of crude oil in complex fault-block heavy oil reservoirs, including: 1. Counting the activity of faults during the oil and gas accumulation period at the high point of the fault block where the well has been drilled; 2. Counting the high point of the fault block where the well has been drilled Fault dip; 3. Use the vertical depth of the sampling point and the data of the fault dip to calculate the distance from the sampling point to the ground; 4. Use the fault activity data, the distance from the sampling point to the ground and the crude oil viscosity to do multiple correlation analysis to obtain the biological Degradation intensity index; Fifth, establish a correlation relationship between the measured viscosity data of crude oil and the biodegradation intensity index; Sixth, substitute the data of fault activity, fault dip angle, and the distance from the design depth to the ground into the fitting formula to calculate the predicted viscosity of crude oil; this method The predicted viscosity data is basically consistent with the latest measured results of drilling crude oil viscosity, and a fitting formula can be established according to the development of faults in different areas to effectively predict the viscosity of heavy oil in undrilled areas, which is true and reliable.

Description

technical field [0001] The invention relates to a method for predicting the viscosity of crude oil in complex fault-block heavy oil reservoirs. Background technique [0002] Heavy oil refers to crude oil with a viscosity of not less than 50mPa·s under formation conditions. Global heavy oil and tar sands and other unconventional oil and gas resources have the potential to be several times that of conventional oil and gas resources. my country's heavy oil and tar sands are also very large. Abundant, super heavy oil and tar sand resources exceed 59.7×10 8 t, heavy oil has become an important field of oil and gas resource exploration, and the viscosity of heavy oil has an important impact on exploration evaluation and later development plan design, so the viscosity prediction of heavy oil has important research significance. [0003] Existing technical methods are mainly limited to predicting the viscosity of heavy oil by using data such as cuttings, wall cores, rock pyrolysis o...

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Problems solved by technology

[0003] Existing technical methods are mainly limited to predicting the viscosity of heavy oil by using data such as cuttings, wall cores, rock pyrolysis of cores, biomarker compounds of extracts, and hydrocarbon composition. These methods must rely on physical analysis and laboratory data to predict viscosity , it is impossible to conduct pre-drilling analysis and prediction for areas without physical data, so it brings difficulties to real-time decision-making such as exploration evaluation and development plan design

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