Study on Solids Distribution and Control in Water Based Drilling Fluids-Take Gas Wells in Western Sulige as Example

LI Minghui; WANG Kai; WANG Qingchen

doi:10.12358/j.issn.1001-5620.2023.05.009

Volume 40 Issue 5

Dec. 2023

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LI Minghui, WANG Kai, WANG Qingchen.Study on solids distribution and control in water based drilling fluids-take gas wells in western Sulige as example[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：611-616 doi: 10.12358/j.issn.1001-5620.2023.05.009

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LI Minghui, WANG Kai, WANG Qingchen.Study on solids distribution and control in water based drilling fluids-take gas wells in western Sulige as example[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：611-616 doi: 10.12358/j.issn.1001-5620.2023.05.009

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Study on Solids Distribution and Control in Water Based Drilling Fluids-Take Gas Wells in Western Sulige as Example

doi: 10.12358/j.issn.1001-5620.2023.05.009

Changqing General Drilling Company, Chuanqing Drilling Engineering Company of CNPC, Xi’an, Shaanxi 710018

Received Date: 2023-03-18
Rev Recd Date: 2023-04-23
Publish Date: 2023-12-25

Abstract

Abstract

This paper discusses the studies on factors affecting solids control of a drilling fluid, such as changes in the solids content of the drilling fluid during drilling, particle size distribution of the drilling fluid, sand content of the drilling fluid as well as the efficiency of the solids control equipment, taking the water based drilling fluids from two gas wells drilled in the eastern Sulige area as examples. The purpose of the studies is to push forward the precise control of field drilling fluids and hence further improve the safe and efficient drilling operation. The results of the studies show that during drilling from the Yanchang formation down to the Majiagou formation, the solids content of the drilling fluid increased from 4%-7% to 9%-13%, accompanied with an increase in mud density. The content of the solids with particle sizes ＞ 109 μm (140 mesh) decreased from 63.05% to 35.5%, the content of the solids with particle sizes ＜ 74 μm increased from 3.98% to 12.73%, and the solids content cannot be reduced to a lower level anymore. The sand content of the drilling fluid was controlled at less than 0.5%. Before and after mud system conversion, the highest efficiencies of solids removal of the sand trap and the shale shakers are reached, which are 43.31%-51.47% and 45.38%-53.98%, respectively. At the same time, the solids removal efficiency of the mud cleaner (desander and desilter) is at the lowest level, which is 5.31%-11.76%. These studies can be used as a reference to the efficient solids control and precise optimization of water based drilling fluids in field operation.
- Water based drilling fluid,
- Solids control,
- Solids distribution

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References(20)

References

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Study on Solids Distribution and Control in Water Based Drilling Fluids-Take Gas Wells in Western Sulige as Example

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