Research and Application of Recirculating Foam Drilling and Completion Fluid

Sui, Yuehua; Xiao-hua, Cheng; Sun, Qiang; Hong-tao, JI; Gao, Jian‐Li; Gao, Qinghua; Zhuang, Zhiwei; Qing, Jishun; Zhou, Aizhao

doi:10.2118/59267-ms

Cited by 5 publications

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

The Study of The Circulation of Drilling Foam

Wan

Meng

et al. 2010

International Oil and Gas Conference and Exhibition in China

View full text Add to dashboard Cite

The circulating utilization of foam fluid is available, which was based on some of the lower carbon alcohols presenting the characteristics of both strong defoaming and weak restricting foam ability, and through optimum selection of formula by indoor experiments. The recirculable feature of four kinds of alcohols on unstable foam (0.6%K12), stable foam (0.6%K12+0.2%XC+0.2%HV-CMC) and stiff foam (0.6%K12+0.2%XC+0.2%HV-CMC+5.0%bentonite) was comparatively investigated. The circulating foam ability of the mixed system of alcohol D and tributyl phosphate (TBP)was studied on the self-made foam fluid circulation experimental device. The results show that alcohol D is the most suitable defoamer in four kinds of alcohols. The mixed system of alcohol D and TBP can recycle stable foam at least 8 times. With increasing cycle number, both foam volume and half life decrease, in which foam volume falls gradually and half life declines more dramatically. After 8 runs, the volume of foam falls from 470ml to 420ml and half life declines from 28.7min to 15.8min, but both of them can fill the actual requirements of on-site drilling. This paper is the first in a series of studies designed to bring forward foam circulating utilization in underbalanced drilling by adding alcohol as defoamer. The goal is to understand the mechanism of foammg-defoaming-refoaming of alcohol better, and extend air foam drilling techniques in suit region.

show abstract

The Study of The Circulation of Drilling Foam

Wan

Meng

et al. 2010

International Oil and Gas Conference and Exhibition in China

View full text Add to dashboard Cite

show abstract

Foam Stability - Does Well Inclination Matter?

Govindu

Ahmed

Shah

et al. 2020

Day 1 Tue, March 24, 2020

View full text Add to dashboard Cite

To minimize fluid loss and the associated formation damage, underbalanced coiled tubing (CT) is one of the preferred methods to perform cleanout operations and re-establish communication with an open completion interval. Because of their high viscosity and structure, stable foams are suitable cleanout fluid when underbalanced CT operations are applied. However, unstable foams do not possess high viscosity and as a result, they are poor in cleanout operations, especially in inclined wellbores. This study is aimed to investigate the effects of wellbore inclination on the stability of foams. In this study, foam drainage experiments were carried out using a flow loop that has foam drainage measurement section and pipe viscometers. To verify proper foam generation and validate the accuracy of measurements, foam rheology was measured using pipe viscometers. Drainage experiments were performed with aqueous, polymer-based, and oil-based foams in concentric annulus and pipe under pressurized conditions. Tests were also conducted at an inclined orientation to examine the effect of wellbore inclination on the stability of foams. The foam bubble structure was examined and monitored in real-time using a microscopic camera to study bubble coarsening. The foam quality (i.e. gas volume fraction) was varied from 40 to 80%. The drainage rate was slightly higher in the pipe section than in the annulus. More importantly, the drainage rate of foam in an inclined configuration was significantly higher than that observed in a vertical orientation. The inclination exacerbated foam drainage and instability substantially. The mechanisms of foam drainage are different in inclined configuration. In inclined wellbores, drainage occurs not only axially but also laterally. As a result, the drained liquid quickly reaches a wellbore wall before reaching the bottom of the hole. Then, a layer of liquid forms on the low-side of the wellbore. The liquid layer flows downward due to gravity and reaches the bottom of the hole without facing major hydraulic resistance of the foam network. This phenomenon enhances the drainage process considerably. Although foam drainage experiments are reported in published literature, there is limited information on the effects of geometry and inclination on foam drainage and stability. The information provided in this article helps to account for the impact of inclination on foam stability to improve its CT cleanout performance in directional wells.

show abstract

Fuzzy Ball Drilling Fluids for CBM in the Ordos Basin of China

Zhang

Zhan

2012

AMR

View full text Add to dashboard Cite

Fuzzy ball drilling fluids have been developed in order to effectively control lost circulation during CBM drilling. Depending upon fuzzy balls and colloids in fuzzy balls, the fuzzy ball drilling fluids changed their shapes and properties to completely plug underground heterogeneous seepage channels so as to strengthen the pressure bearing capacity of formations. This paper describes the available features of the fuzzy ball drilling fluid including efficient plugging, good carrying and suspension, formation damage control, compatible weighted by any weighted materials without auxiliary equipment. The fuzzy ball drilling fluids can finish drilling in low pressure natural gas zone, control CBM leakage; control the natural fractures, drilling in different pressures in the same open hole, combination with the air drilling mode, etc. during Ordos CBM drilling. The fuzzy ball drilling fluid will not affect down-hole motors and MWD. The fuzzy ball drilling fluid will be blend simply as conventional water based drilling fluids. The existing CBM drilling equipment can completely meet the fuzzy ball drilling mixing and it is maintained conveniently. The fuzzy ball drilling fluid is the efficient drilling fluid.

show abstract

Research and Application of Recirculating Foam Drilling and Completion Fluid

Cited by 5 publications

References 0 publications

The Study of The Circulation of Drilling Foam

The Study of The Circulation of Drilling Foam

Foam Stability - Does Well Inclination Matter?

Fuzzy Ball Drilling Fluids for CBM in the Ordos Basin of China

Contact Info

Product

Resources

About