Best Practices for Horizontal Wells Completion Technology and Multistage Fracturing for High Pressure Achimov Formation at Urengoyskoe Field (Russian)

Abalev, A.; Zaichenko, D.; Tyutikov, S.; Inyushina, A.; Koncheko, A.

doi:10.2118/171277-ru

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A technical and risk comparison between re-fracturing an existing HW MSF to drilling a sidetrack well and completing it with MSF is given in the Table 1: Figure 15-Fracture geometry as a result of the TVD initiation point within the horizontal wellbore (18) Obviously, from the assessment above it is clear that there is an immediate need to address the following questions though engineering feasibility studies for:…”

Section: Horizontal Wells Sidetrackmentioning

confidence: 99%

Re-fracturing Considerations of Horizontal Well Multi Stage Fractured Completions in Mid Permeability Formations

2015

View full text Add to dashboard Cite

The oil and gas industry in Russia started facing a complex problem of productivity decline from horizontal multi stage fracture completed wells drilled in the low to mid permeability reservoirs. To enhance hydrocarbon flow from these formations, aggressive production using artificial lift is supported with active water flooding. Nevertheless, operators have acknowledged that the horizontal well multi stage fracture (HW MSF) completions do not live to their expectations.The application of HW MSF completions started in 2008, but widespread acceptance followed several years later. Today, in Russia, about 300 horizontal wells are drilled and completed annually bringing the total number of HW MSF to more than 1200 wells. All these wells are potential candidates for re-fracturing treatments and re-completion, but while re-fracturing of vertical wells is a well proven success in Russia, the industry today has no clear understanding how to address the multitude of potential productivity difficulties in HW MSF.During the work published in this paper, the team has analyzed all the known potential engineering problems and technical risks and clearly defined the domains of further investigation and set recommendations on measurements that are needed to understand the impact of re-fracturing. The analysis was based on field measurements made, analytical calculation and numerical simulations, modeling in all details the key processes defining the productivity of HW MSF completions. The results indicate that pressure influenced stress changes in a mostly isotropic system and resulting fracture placement within the horizontal wellbore are key contributors to the complexity of the problem.The paper presented here is a genuine attempt for the industry streamline further search for solutions and novel methodology to effectively re-fracture the existing completion systems and bring these wells to profitable production.

show abstract

Section: Horizontal Wells Sidetrackmentioning

confidence: 99%

Re-fracturing Considerations of Horizontal Well Multi Stage Fractured Completions in Mid Permeability Formations

2015

View full text Add to dashboard Cite

show abstract

A Multistage Stimulation Operation to Unlock the Gas Potential of the Turonian Siltstone Formation in Western Siberia

et al. 2015

View full text Add to dashboard Cite

One of the strategic targets in Yamal autonomous district, the Turonian siltstone formation, lies above the Cenomanian formation and is separated by a massive argillite barrier. Successful stimulation experience in vertical wells in the North-Kharampurskoe field during 2008 to 2010 encouraged the operator planning the next step of field exploration to consider horizontal well completions using multistage stimulation. The paper will describe pilot campaign in details. The Yamal Turonian formation was formed in a coastal marine environment with slow deposition rates and is composed primarily of siltstone. The major challenges of the Turonian formation are low permeability (∼0.5 md) and extremely high clay content—chlorite, kaolinite, illite, and mixed-layer illite-montmorillonite. The low temperature of the Turonian formation (below 80°F) also presents a significant challenge for gas production. An operator must produce at minimum drawdown to avoid hydrates creation. The shallow reservoir depth (∼ 3,000 ft) restricts recovering potential energy stored inside of the formation (initial reservoir pressure of about 1600 psi); therefore, hydraulic fracturing is a must for economic development of the Turonian formation. Selecting the correct fracturing fluid required extensive laboratory tests for compatibility and rheology adjustments. Thorough optimization of the fracturing fluid with clay stabilizer was applied during the course of this project. Additional challenges included proppant flowback tendency and inefficiency of conventional methods (resin-coated proppant) at such low temperatures. The project began by stimulating a vertical well that was used as a reference for the fracture horizontal well that was stimulated in three stages. Coring and a full logging suite were performed on the reference well, including acoustic measurements, post-frac, to obtain fracture height growth. It was shown that fracture is vertical at such depth and that it covers the whole interval without vertical growth into argillaceous barriers. Bottom hole gauges were used to complete the precise mechanical modeling of the stimulated reference well. Evaluation of the mechanical and properties were completed using E&P software platform-based simulator to optimize the multistage fracturing design in the horizontal well. This paper includes a detailed sequence of the operations performed and explains conclusions made concerning fracture geometry. The lessons learned during the assessment campaign are described. This stimulation project performed in the North-Kharampurskoe field is fundamental in development of the field and serves as important step toward unlocking the gas potential of other Turonian siltstones.

show abstract

Unsteady-state conditions of producing wells at of the Urengoy oil and gas condensate field influences their efficiency

Inyakin

Mulyavin

Usachev³

2019

Izvestiâ vysših učebnyh zavedenij. Neftʹ i gaz

View full text Add to dashboard Cite

The development of oil and gas condensate fields is accompanied by phase transformations of reservoir mixtures, i.e. the when the bottomhole pressure drops below the dew point pressure, the liquid condensate becomes versatile and enters the gas phase. Retrograde condensate leads to a decrease in phase permeability in the bottomhole. As a result, it also leads to a decrease in production levels is reduced both by gas and natural gas liquids. The article considers this challenge and its possible solutions by the method of unsteady-state conditions well efficiency, on which the hydraulic fracturing was carried out. The issue of well efficiency is urgent in conditions abnormally high reservoir pressure and considerable condensate yield.

show abstract

Best Practices for Horizontal Wells Completion Technology and Multistage Fracturing for High Pressure Achimov Formation at Urengoyskoe Field (Russian)

Cited by 3 publications

References 0 publications

Re-fracturing Considerations of Horizontal Well Multi Stage Fractured Completions in Mid Permeability Formations

Re-fracturing Considerations of Horizontal Well Multi Stage Fractured Completions in Mid Permeability Formations

A Multistage Stimulation Operation to Unlock the Gas Potential of the Turonian Siltstone Formation in Western Siberia

Unsteady-state conditions of producing wells at of the Urengoy oil and gas condensate field influences their efficiency

Contact Info

Product

Resources

About