Creating and Introducing New Innovative Approaches to Form a Large Oil-Gas-Condensate Field Development System in the Extreme North Conditions

摘要

Objective and Scope:The oil and gas fields of the Bolshekhetskaya depression are characterized by significant remoteness from the existing infrastructures(roads,power lines,pipelines),as well as the severe Extreme North climatic conditions of the Yamalo-Nenets Autonomous District.The authors have worked out a complex approach to developing fields in this region to ensure a high hydrocarbon recovery level with economically viable indicators.The use of innovative solutions was tested at Pyakyakhinskoe field of the Bolshekhetskaya depression where commercial production started in 2016.Methods and Techniques Used,Process Description:The development method worked out by the authors(S.A.Solyanov,M.G.Mavletdinov,A.V.Zaytsev)is unprecedented and was patented in 2016(invention 2635926,2017).The benefit of this development system is the cellular structure of the development elements consisting of seven horizontal or multihole wells,which allows exercising efficient control over development and also regulating voidage replacement in each cell.The development system is closed,which allows starting well development by cells.The well construction technology was improved to implement the proposed development system with the use of multihole wells.The substantiation of this technology implies the application of only the standard drilling and geological steering equipment.Results,Conclusions:Today,two targets with the main oil reserves,BU15 1 and BU15 2,are completely drilled with wells using the proposed development system and commissioned at Pyakyakhinskoe field.The current target development data confirm the forecast efficiency indicators and also the high efficiency of the developed technological and operating solutions.It is decided to apply this development system to other analogous targets of the Bolshekhetskaya depression.Well technologies with multizone hydraulic fracturing and multihole wells with a different number of wellbores were introduced and technologies of insulating separate intervals were tested for gas-condensate targets.These well technologies allowed increasing the commercial construction rate by 22.0-41.3%(depending on the drilled targets)and ensuring 100% successful liner running into the main horizontal section without additional activities and technical means.Novel and Accomplishments:The development method worked out by the authors(S.A.Solyanov,M.G.Mavletdinov,A.V.Zaytsev)and implemented at oil targets of Pyakyakhinskoe field is unprecedented and was patented in 2016(invention 2635926,2017).The efficiency of using the closed development system based on horizontal injection wells and multihole horizontal production wells is confirmed with the actual well operation values,the planned indicators have been achieved in full measure.The production company has decided to apply this system to other targets.