Device and method for determining high temperature and high pressure full diameter core mud pollution evaluation

Abstract

The invention relates to a device and method for determining high temperature and high pressure full diameter core mud pollution evaluation. The device is mainly composed of an injection pump, a confining pressure pump, a mud intermediate container, a mud circulating device, a full diameter core holder, a nitrogen intermediate container, a formation water intermediate container, a confining pressure intermediate container, a back pressure intermediate container and a graded tube. The full diameter core holder, the nitrogen intermediate container and the formation water intermediate container are located in a high temperature and high pressure constant temperature oven, the mud circulating device comprises a low pressure circulating cylinder, a high pressure circulating mud cylinder and an automatic control device, and a supporting frame is arranged between the low pressure circulating cylinder and the high pressure circulating mud cylinder. The device and method for determining the high temperature and high pressure full diameter core mud pollution evaluation adopts a unique external circulation mode, uses a low pressure air source as power to drive high pressure mud to circulate, eliminates the problem that a conventional circulation device is easy to block and damage and short in service life, fills the blank that a conventional drilling fluid filtration apparatus cannot perform filtration experiment evaluation on a large-size full diameter core, and can comprehensively simulate and evaluate the drilling fluid pollution mechanism under real gas reservoir condition.

Description

Technical field [0001] The invention relates to large-scale experimental equipment and an evaluation method for dynamic monitoring and damage evaluation of mud filtration loss under indoor high-temperature and high-pressure conditions, and belongs to the field of oil and natural gas exploration and development. Background technique [0002] In the process of oil and gas exploration and development, drilling engineering always faces the problem of reservoir damage. How to monitor the leakage of drilling fluid in the formation effectively and in real time, and deeply and objectively evaluate the damage degree of drilling fluid to the reservoir permeability is a common technical issue. [0003] During the drilling process, the solid and liquid phases in the mud enter the reservoir, causing blockage of effective pores in the reservoir and various sensitive damages, reducing the permeability of the reservoir and destroying the pore structure of the reservoir, thereby reducing rec...

AI Technical Summary

Problems solved by technology

[0004] At present, mud pollution evaluation refers to the petroleum industry standard SY / T6540-2002 "indoor evaluation method for drilling fluid and completion fluid damage to oil layer". This device and method are only suitable for mud pollution evaluation of oil reservoirs under normal temperature and pressure. The amount of fluid is small, the accuracy and representativeness of the experimental test are limited, and the mud damage during the drilling process of gas reservoirs under high temperature and high pressure cannot be fully simulated

Images