Successful Field Pilot of In-Depth Colloidal Dispersion Gel (CDG) Technology in Daqing Oil Field

Chang, Harry L.; Sui, Xingguang; Long, Xiao; Guo, Zhidong; Yao, Yuming; Yiao, Yuguo; Chen, Gang; Song, Kaoping; Mack, James C.

doi:10.2118/89460-pa

Cited by 67 publications

(41 citation statements)

References 14 publications

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“…More recently there have been several reports of CDG field trials (see e.g. Chang et al, 2006 andDiaz et al, 2008). Both Chang and co-workers and Diaz and co-workers report an increase in oil production.…”

Section: Introductionmentioning

confidence: 99%

Nano-Sized Particles for EOR

Skauge¹,

Spildo²,

Skauge³

2010

All Days

100

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During the last decades colloidal dispersion gels (CDG) have been applied as an EOR method, providing sweep improvement in reservoirs with unfavourable mobility ratio. Our core flood results also indicate an improved microscopic sweep or microscopic diversion by CDG. This paper investigates the oil mobilization properties of nano-sized silica particles in comparison to nano-sized CDG particles and discusses the underlying mechanisms of microscopic flow diversion.Improved microscopic displacement efficiency has traditionally been coupled to changes in capillary number. However, this approach is insufficient to describe processes like low salinity injection, colloid dispersion gels, and microbial enhanced oil recovery.This paper presents a new concept of EOR by improved microscopic displacement defined as microscopic diversion. This method involves pore blocking and diversion of injection fluids. Multi-phase flow experiments using nano-sized silica particles attempts to investigate the effect (inelastic) nano-sized fines migration can have on oil mobilization by microscopic diversion.The oil mobilization properties were investigated by core floods using well-defined nano-sized silica particles in comparison with injection of CDG, polymer or silica particles dispersed in a polymer solution.. Core floods were performed on water-wet Berea sandstone cores with permeabilities of approx. 500 mD. The comparison of inelastic silica particles, polymer solutions and nano-sized CDG particles allowed an evaluation of the importance of viscoelastic properties for microscopic diversion.

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Section: Introductionmentioning

confidence: 99%

Nano-Sized Particles for EOR

Skauge¹,

Spildo²,

Skauge³

2010

All Days

100

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show abstract

“…These gels are typically polyacrylamides that are lightly cross-linked in situ after injection due to the higher temperature of the reservoir. These gels have been successfully pilot-tested at the Daqing Field in China (Chang et al 2006) and implemented field-wide in the Dina Cretaceous Field in Colombia (Castro et al 2013). It is possible they may allow deeper propagation into the formation along with greater throughput and increased injectivity, but there are mixed results.…”

Section: Mature Fields Key Processes and Technologiesmentioning

confidence: 99%

New Technologies For Optimizing Energy-Fluid Input And Flow Assurance In Mature Assets

et al. 2014

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TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractMature fields are the backbone of global oil and gas production. In fact, 70% of worldwide oil production comes from mature fields. A great deal of knowledge about how to exploit mature fields has been gathered throughout the years. However, as more areas become mature, new situations and new challenges arise. Revitalizing these fields extends their productive life and offers significant opportunity to expand worldwide reserves. New technology is critical when trying to increase hydrocarbons extracted from a field beyond the original expectations.This paper highlights emerging techniques associated with five key aspects of revitalizing mature fields. These are: energizing the reservoir using water and polymer flooding on viscous oil fluids, enhancing reservoir deliverability through pinpoint hydraulic fracturing techniques, assuring optimal injectant placement using lasting, functional smart well completions, and improving the rod pumps by using linear lift systems.Also, while technology plays an indispensable role in revitalizing a mature field, cost control, risk management, and optimizing economics are equally important throughout the decision-making process. This paper describes the impact of each emerging mature field technique and discusses recent advancements in technology that enable a new, distinctive approach to increasing production and recovery during the mature stages of the life of a field.

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“…(Prada et al 2000). Colloidal dispersion gels (CDGs) were investigated for blocking of ''thief zones'' in heterogeneous formations (Chang et al 2006). With respect to the organically crosslinked gels, a system was designed by the PDVSA Research and Development Center that can exhibit blocking performance at temperature up to 160°C.…”

Section: Introductionmentioning

confidence: 99%

CO2-triggered gelation for mobility control and channeling blocking during CO2 flooding processes

Zhang

Liu

et al. 2016

Pet. Sci.

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CO 2 flooding is regarded as an important method for enhanced oil recovery (EOR) and greenhouse gas control. However, the heterogeneity prevalently distributed in reservoirs inhibits the performance of this technology. The sweep efficiency can be significantly reduced especially in the presence of ''thief zones''. Hence, gas channeling blocking and mobility control are important technical issues for the success of CO 2 injection. Normally, crosslinked gels have the potential to block gas channels, but the gelation time control poses challenges to this method. In this study, a new method for selectively blocking CO 2 channeling is proposed, which is based on a type of CO 2 -sensitive gel system (modified polyacrylamide-methenamine-resorcinol gel system) to form gel in situ. A CO 2 -sensitive gel system is when gelation or solidification will be triggered by CO 2 in the reservoir to block gas channels. The CO 2 -sensitivity of the gel system was demonstrated in parallel bottle tests of gel in N 2 and CO 2 atmospheres. Sand pack flow experiments were conducted to investigate the shutoff capacity of the gel system under different conditions. The injectivity of the gel system was studied via viscosity measurements. The results indicate that this gel system was sensitive to CO 2 and had good performance of channeling blocking in porous media. Advantageous viscosity-temperature characteristics were achieved in this work. The effectiveness for EOR in heterogeneous formations based on this gel system was demonstrated using displacement tests conducted in double sand packs. The experimental results can provide guidelines for the deployment of the CO 2 -sensitive gel system for field applications.

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Successful Field Pilot of In-Depth Colloidal Dispersion Gel (CDG) Technology in Daqing Oil Field

Cited by 67 publications

References 14 publications

Nano-Sized Particles for EOR

Nano-Sized Particles for EOR

New Technologies For Optimizing Energy-Fluid Input And Flow Assurance In Mature Assets

CO2-triggered gelation for mobility control and channeling blocking during CO2 flooding processes

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