Testing method of depositing stability of drilling fluid

Abstract

The invention discloses a testing method of the depositing stability of drilling fluid. The testing method comprises the following steps: (a) preparing the drilling fluid for future use; (b) uniformly agitating the drilling fluid and pouring into an experiment container until the drilling fluid reaches a full scale; standing for a certain time; and (c), taking the drilling fluid at a 2 / 5 part and determining the density of the drilling fluid of the upper layer through a tool and taking the drilling fluid at a 4 / 5 part; and determining the density of the drilling fluid of the lower layer through the tool, wherein according to a tested result, if an upper-lower density difference value of a drilling fluid system in a measuring cylinder is zero and no water separation phenomenon exits, the depositing stability is good. According to the testing method disclosed by the invention, the depositing stability of the drilling fluid can be rapidly determined; and the tested result is accurate, the testing step is simple and the testing cost is greatly reduced.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for the settlement stability of drilling fluid. Background technique [0002] With the continuous development of the world's petroleum industry, oil and gas drilling and development areas continue to expand, drilling and development is gradually developing from shallow to deep, geological structures are becoming more and more complex, and drilling depth is increasing, which puts forward higher requirements for the required drilling fluid To meet the increasing development of the petroleum industry. [0003] At present, in China's oil and gas exploration and development, deep wells will be the focus of future exploration and development. Drilling operations in the Bashituo area of ​​Xinjiang are difficult, time-efficient and costly due to the relatively deep burial of reservoirs, large changes in formation pressure, and complex and changeable lithology. The specific manifestations ...

AI Technical Summary

Problems solved by technology

All of these conditions will impair the rheology of high-density water-based drilling fluid systems

[0013] In addition, if the solid phase content in the drilling fluid system is high, the treatment agent itself has poor resistance to temperature, salt, and calcium, and the treatment agent will lose its effectiveness. As a result, the rheology of high-density water-based drilling fluid cannot be controlled.