Multistage temporary plugging acid fracturing technology application to long well interval heterogeneous carbonate reservoir

Sheng Jianming, Wu Xinrong, Huang Aijun, Wang Anpei, Zhao Bin, Geng Bo

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)

Abstract

Sichuan Puguang Gas Field is high sulfur content carbonate gas reservoir buried in the depth of 4775.4 ∼6461.3m. In the produced gas, the average content of methane is about 75%, H2S 15% and CO210%. The thickness of producing formation is between 176.4m∼838.8m, on average, the thickness is 395m. The formation is severely heterogeneous, including type□, type□ and type □ reservoir which is developed alternately. The proportion of type □ reservoir is more than 50%, the total ratio of type □ and type □ is more than 90%. Gas testing in early exploration phase obtained no commercial gas production in type II and type III reservoir. Using the cores from Puguang gas field reservoir, fracture flowing capacity experiments have been conducted by using various acid fracturing fluid systems and different technical models. Considering geological characters, completion situation and surface gathering conditions, large-scale temporary plugging multistage injection acid fracturing technology is selected. The plugging ratio of the temperature-controlled temporary plugging agent is more than 90% and the plugging strength is greater than 15MPa. The pump discharge capacity of the new gel acid system is 10 m31 min. The operating friction is 30% of that of clear water. The viscosity is more than 30mPas after being kept for 180min under 130□. 34 wells have been acid fractured by using this technology, and the average open-flow capacity of a single well is 487.8×104m3/d. And after having been producing for one year the average gas production of a single well is 69.3×10 4m3/d. Multistage temporary plugging acid fracturing technology application to long well interval heterogeneous carbonate reservoir integrated with acid fracturing technology and optimized design is technical guarantee to develop Puguang Gas Field efficiently and safely, and at the same time it will also be a technology backup to develop some similar gas fields.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013
Subtitle of host publicationChallenging Technology and Economic Limits to Meet the Global Energy Demand
PublisherEarthDoc
Pages872-883
Number of pages12
ISBN (Print)9781627481762
Publication statusPublished - 2013
Externally publishedYes
EventInternational Petroleum Technology Conference 2013 - Beijing, China
Duration: 26 Mar 201328 Mar 2013
https://www.earthdoc.org/content/proceedings/Beijing2013 (Proceedings)

Conference

ConferenceInternational Petroleum Technology Conference 2013
Abbreviated titleIPTC 2013
Country/TerritoryChina
CityBeijing
Period26/03/1328/03/13
Internet address

Keywords

  • Acid fracturing
  • Heterogeneous
  • Long well interval
  • Multistage temporary plugging

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