Comprehensive Approach to Production Stimulation of Massive Cold Heterogeneous Carbonate Formation using Coiled Tubing

Dnistrjanskij, Vladimir Ivanovich; Mokshaev, Aleksander Nikolaevich; Bogatyrev, Oleg Mikhailovich; Ilgildin, Ruslan Fatkhetdinovich; Kayumov, Rifat; Burdin, Konstantin; Lobov, M. A.

doi:10.2118/152351-ms

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…After the spearhead, the normal matrix acidizing treatment continued with alternating stages of acid and chemical diverter. Dnistryansky et al (2012) showed an example of using VSD spearhead stages during matrix acidizing of the giant Orenburg oil, gas, and condensate field. While previous acidizing treatments on the field had caused water breakthrough, no water production was observed on wells treated with the spearhead VSD stage.…”

Section: Viscoelastic Selective Divertermentioning

confidence: 99%

“…CT is available in the Volga-Urals region and high friction pressure limits the maximum pump rate to 150 L/min. Dnistryansky et al (2012) showed that in long openhole carbonate intervals matrix acidizing with 15% HCl through 1.5-in. CT results in face dissolution but no wormholes (Fig.…”

Section: Using Ct For Matrix Acidizingmentioning

confidence: 99%

“…Use of REA can help create wormholes even with a low pumping rate through CT. Dnistryansky et al (2012) provided an example of using REA for stimulation of depleted horizontal openhole wells through CT in the Orenburg region; gas production increased after the treatment by 20% when compared with pretreatment data. Other methods to improve the effectiveness of matrix acidizing through CT are described in Ways Forward section.…”

Section: Using Ct For Matrix Acidizingmentioning

confidence: 99%

“…The advantages of emulsified and retarded acids are generally considered the most for cases when the reaction is controlled by mass transfer of hydrogen ion (H+); e.g.. mid-and high-temperature limestone and high-temperature dolomites. As demonstrated by Dnistryansky et al (2012), it also can be beneficial for acidizing lowtemperature limestone when only a low pumping rate is available.…”

Section: Retarded Emulsified Acidmentioning

confidence: 99%

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Experience of Carbonate Acidizing in the Challenging Environment of the Volga-Urals Region of Russia

Kayumov

Konchenko

Bairamov

et al. 2014

SPE International Symposium and Exhibition on Formation Damage Control

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The Volga-Urals basin is one of the largest oil-producing regions in Russia. Orenburg region is essential part of Volga-Urals basin and it represents most of the challenges encountered in the other parts of the basin. More than half the wells produce exclusively from carbonate formations and require periodic acidizing treatments to maintain economic production. Carbonate stimulation treatments are usually based on pumping of hydrochloric acid into the formation with use of special diverters to maximize zone coverage by acid treatment. Some of the formation properties in Volga-Urals basin create additional challenges for successful acidizing treatments, including significant reservoir pressure depletion, high water cut, formation heterogeneity with high-and low-permeability strikes, low reservoir temperature, crude with tendency for emulsion and sludge creation, and enormous thief zones created by previous acidizing treatments. In many cases, uncertainties in the formation properties make the stimulation more complex.Carbonate stimulation practices in the Orenburg region have continuously improved during the last 6 years. First, degradable balls and polymer self-diverting acid were introduced to improve zone coverage. Later, viscoelastic self-diverting acid was added to eliminate damage associated with the polymer, and a viscoelastic selective diverter was used to minimize the probability of an increase in water cut after the treatment. Finally, foam was placed as a diversion agent, with and without coiled tubing (CT), to account for reservoir pressure depletion and help in post-acidizing flowback. Many lessons were learned, resulting in recommendations for use of various technologies at different reservoir and wellbore conditions.In addition to the recommendations for technologies, a quality assurance and quality control (QAQC) standard was developed and implemented for acidizing treatments. Moreover, laboratory work such as core flow testing and proppant embedment tests has been undertaken to clarify post-treatment aspects.Most fields in the Orenburg region are old, which implies that quality of well candidates became worse from year to year. However, with continuous improvement in stimulation practices and rigorous quality control we manage to maintain production at economic level and even increase work scope compared with previous years. This paper presents the experience gained during the 6-year of acidizing treatments in Orenburg region with lessons learned, and best practices adopted.

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Section: Viscoelastic Selective Divertermentioning

confidence: 99%

Section: Using Ct For Matrix Acidizingmentioning

confidence: 99%

Section: Using Ct For Matrix Acidizingmentioning

confidence: 99%

Section: Retarded Emulsified Acidmentioning

confidence: 99%

See 2 more Smart Citations

Experience of Carbonate Acidizing in the Challenging Environment of the Volga-Urals Region of Russia

Kayumov

Konchenko

Bairamov

et al. 2014

SPE International Symposium and Exhibition on Formation Damage Control

Self Cite

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Perspective View on Gas Well Stimulations in Case of Complex Carbonate Reservoir

Жуков

Volnov

Ermilov

et al. 2017

Day 3 Wed, October 18, 2017

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Most modern challenges of gas field development are caused by an increase in complexity of geological structure, mainly associated with carbonate reservoirs. The studied field is characterized by the reservoir complexity, heterogeneity of reservoir properties both laterally and in section, the high impact of stratification factor and variability of rocks at micro scale. It significantly affects reliability of well productivity and field gas production prediction. For such fields, in order to reduce risks, it is necessary to identify the best technology for well stimulation, which allows achieving high gas recovery and economic efficiency. In this article, the five main criteria for the efficiency of such well operations are formulated. The authors present the results of application of basic well stimulation technology for carbonate reservoirs. It is acid treatment (acidizing) with various chemical compositions. The results of work on selective acidizing, both with the use of packer systems and with the use of chemical deviators, are described. On the next step a review of existing methods of well stimulation and selection of a new perspective technology, alternative to acid treatment, is performed. As an untested technology, the acid fracturing with flow deflectors is considered. Polymer spheres or complex polymer systems based on glass fibers and resins may be used as the deflectors. The purpose of acid fracturing is production enhancement by increasing of reservoir conductivity in the bottom-hole area, activation of non-flowing reservoir zones and reducing skin factor and D-factor values. An important task is to involve low permeable zones containing significant volume of gas in the production and preserve high productivity of high permeable zones. The selectivity effect is provided by flow deflectors. This technology is advisable to conduct on reservoirs that have several separated productive layers, when it is necessary to treat each layer. The authors identified main criteria for application of acid frac and selected appropriate wells. The design of acid fracturing was made with the use of a specialized software package. The impact of the reservoir features on fracture geometric parameters was studied. The final forecast of gas production increased. Economic efficiency was estimated with a use of the full-scale reservoir simulation model. The practical significance of the work is to generalize the experience of pilot projects carried out at the field, and to select a perspective technology for well stimulation in conditions of complex low permeable carbonates.

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Perspective View on Gas Well Stimulations in Case of Complex Carbonate Reservoir (Russian)

Жуков

Volnov

Ermilov

et al. 2017

SPE Russian Petroleum Technology Conference

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Comprehensive Approach to Production Stimulation of Massive Cold Heterogeneous Carbonate Formation using Coiled Tubing

Cited by 5 publications

References 6 publications

Experience of Carbonate Acidizing in the Challenging Environment of the Volga-Urals Region of Russia

Experience of Carbonate Acidizing in the Challenging Environment of the Volga-Urals Region of Russia

Perspective View on Gas Well Stimulations in Case of Complex Carbonate Reservoir

Perspective View on Gas Well Stimulations in Case of Complex Carbonate Reservoir (Russian)

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