First Application in Russia of Bright Water™ Chemical for Waterflood Sweep Improvement in the Samotlor Field

Thrasher, David; Denyer, P.; Timchuk, A.S.; Zemtsov, Yu.V.; Akinin, D.V.

doi:10.3997/2214-4609.20142633

Cited by 4 publications

(2 citation statements)

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“…TAP technology has been used to improve sweep efficiency in waterflood projects in onshore and offshore fields. Most recent field implementation includes pilot expansion in El Borma Field, Tunisia (Galli et al, 2012), the first application in Russia at the Samotlor Field, West Siberia (Thrasher et al, 2013) and several treatments implemented in West Siberia (4Q 2012) and Argentina (early 2013) not documented in the literature. However, pilot project in Ebano Field represents the most recent offshore projects and one of the largest implementation of TAP technology.…”

Section: Water Injection Startmentioning

confidence: 98%

Reservoir In-Depth Waterflood Conformance: An Offshore Pilot Implementation

Choudhary

Parekh

Solis

et al. 2014

SPE Improved Oil Recovery Symposium

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Ebano field is a high permeability slope-channel turbidite reservoir located offshore Equatorial Guinea, West Africa. Oil production from this field started in May 2009 and water injection began in July 2009. Currently, the field operates with two wells; one injector and one producer with a well spacing of 1.5 km. Water breakthrough was observed approximately one year after water injection began, which was much earlier than the original prediction suggesting presence of water injection thief zone(s). Several reservoir management strategies to improve sweep efficiency were considered for implementation in this field including a reservoir in-depth waterflood conformance technology using a thermally active polymer (TAP). This paper will summarize the TAP pilot design, implementation, and performance interpretation based on a comprehensive surveillance program. The paper will also describe the workflow utilized to evaluate the technical feasibility of TAP technology (supported by detailed engineering, laboratory, and simulation studies).Engineering and laboratory studies to evaluate the technical feasibility of TAP started September 2010 and TAP pilot implementation commenced April 2011. Injection of TAP treatment was done from a barge requiring significant coordination between offshore and onshore to ensure safe handling and injection of chemicals. A total of 48,000 bbl of TAP were injected at an injection rate of 6,000 bbl/d, using a concentration of 15,000 ppm (4 cp injected). This treatment has been one of the largest offshore implementation using TAP technology. A detailed surveillance plan was put in place that included gathering and detailed analysis of injection/production data, injection pressure, produced water compositional analysis, production logs (PLT), and Fall-Off Tests (FOT) before and after the TAP treatment.Ebano pilot results validated TAP displacement and activation away from the injector. PLT data showed that the injection profile remained unaltered post treatment. Time-lapse FOT proved to be very useful in monitoring TAP performance. Uncertainties relating to how far away from the injector TAP was fully activated, injection pressure response (simulation vs. field), and production performance will also be addressed.

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Section: Water Injection Startmentioning

confidence: 98%

Reservoir In-Depth Waterflood Conformance: An Offshore Pilot Implementation

Choudhary

Parekh

Solis

et al. 2014

SPE Improved Oil Recovery Symposium

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“…Colloidal gels are used as option of polymer fl ooding, in which the rim is reduced to 10000m 3 and below. One option is the BrightWater (Nalco) technology, which is based on the injection of dispersion of ultra-small polymer particles that swell and cross-link after placement in highly permeable water-saturated layers/ rims in reservoirs with high temperature [34,38,56]. Thus, modern research is focused on searching more effective surfactants or their compositions, as well as on optimization of chemical reagents injection methods into the formation, i.e.…”

Section: Analysis Of Modern Eormentioning

confidence: 99%

Regulation of filtration characteristics of highly watered terrigenous formations using complex chemical compositions based on surfactants

Korolev¹,

Рогачев²,

Tananykhin³

2020

J Appl Eng Science

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A signifi cant share of Russian oil fi elds has entered the fi nal stage of development and is characterized by a drop in production. It comes true due to the depletion of active oil reserves, and, as a consequence, an increase in the proportion of residual oil trapped in areas which are not covered by fl ooding, and physically or chemically associated with the formation of oil. An additional factor is the increase in the water content of complex-structured terrigenous reservoirs and their high number of permeable intervals. Development of the considered productive formations is carried out, as a rule, with maintenance of reservoir pressure by means of "cold" fl ooding. Despite the development and relatively low cost, it has its limitations/restrictions. The main reasons why we are not able to achieve complete displacement of oil by "cold" water are the difference between the viscosity of oil and the displacing agent, their immiscibility and hydrophobization of reservoir rocks [14]. All methods of enhanced oil recovery (EOR) used for highly watered oil fi elds with hard-to-recover reserves are aimed at additional recovery of residual oil and achieving the design oil recovery factor (ORF), by optimizing the fl ooding system and upgrading the fl ooding agents. The design ORF can be achieved by increasing the water fl ood displacement effi ciency, by improving the washing capacity of water (displacement agent), or by increasing the sweep effi ciency of the reservoir fl ooding.

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Waterflood Sweep Improvement at Prudhoe Bay, Alaska

Thrasher

Nottingham²,

Stechauner³

et al. 2016

SPE Improved Oil Recovery Conference

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Waterflood conformance control due to reservoir heterogeneity is a common challenge to many oilfield developments. This paper describes the application at-scale of a thermally-activated polymer particle system (TAP) for improving waterflood sweep efficiency in the Prudhoe Bay field, Alaska. Since 2004, the technology has been successfully deployed 91 times in Prudhoe Bay Unit on the North Slope of Alaska as part of an approved Enhanced Oil Recovery (EOR) program. A total of 1.6 million gallons of chemical polymer particles have been injected into approximately half of the available waterflood patterns. Once the polymer particles activate deep in the reservoir, they provide resistance to water flow in the thief (swept) zones. The treatment design workflow applies a thermal model which accounts for the impact of the temperature distribution in the reservoir on activation of the polymer particles. Challenges associated with performance evaluation of the treatment program in a normal operational setting (as opposed to field trial) have been addressed, particularly in relation to interferences to interpretation resulting from the ongoing application of miscible gas EOR in the waterflood areas. Of the 44 treatments deployed between 2008 and 2012, 22 were sufficiently mature to have performance data which was not adversely impacted by interferences from well work, changes to operating conditions, or miscible gas breakthrough. So far, only one of the 22 patterns has not indicated an incremental oil response, while in two patterns the response had started too recently to be able to extrapolate the overall response magnitude. The analysis showed overall positive responses from the treatments that are competitive with other well work on cost/bbl and project economics. Results from this study provide insights on key controls on waterflood sweep improvements, and inform future candidate selection and optimization of treatment designs. The production performance analysis was corroborated by wellhead injectivity, repeat pressure fall-off tests, and reservoir modeling. This paper documents a good case history of waterflood sweep improvement.

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First Application in Russia of Bright Water™ Chemical for Waterflood Sweep Improvement in the Samotlor Field

Cited by 4 publications

References 0 publications

Reservoir In-Depth Waterflood Conformance: An Offshore Pilot Implementation

Reservoir In-Depth Waterflood Conformance: An Offshore Pilot Implementation

Regulation of filtration characteristics of highly watered terrigenous formations using complex chemical compositions based on surfactants

Waterflood Sweep Improvement at Prudhoe Bay, Alaska

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