Doctoral Dissertations


Yongpeng Sun

Keywords and Phrases

Formation damage; Liquid intake; Microfracture; Shale gas; Slickwater fracturing; Tight gas


"A tight reservoir always requires hydraulic fracturing before production to increase production rate. The additives in hydraulic fluids are highly considerable for a successful stimulation. A friction reducer is often used to reduce the flowing friction in the wellbore during hydraulic fracturing. Extensive researches have been conducted to examine the extent it can reduce the fluid friction in tubings; however, no research has been reported on its behavior in a reservoir, which is related to the fracture extension. A breaker is also pumped into the formation to degrade the friction reducer. However, it is not clear that what is the best time to break it. After the hydraulic fracturing, the existence of liquid in matrix reduces the gas phase permeability. A surfactant is added to reduce water block by providing a low surface tension. However, the effect of the surfactant on the petrophysical properties of tight rocks is not clear.

In this dissertation, the following four researches have been carried out, and significant findings have been summarized in conclusions. The friction reducer flow behavior in microfractures was studied firstly, including size effect, concentration effect, wettability effect, and etc. Consequently, various additives impact on the petrophysical properties on tight sand was examined, such as surface contact angle, gas phase permeability, liquid imbibition, and gas transportation. Then, formation damage of FR and breaker in tight sand was systematically investigated. The impact factors were disclosed in detail, including fluid concentration, sample length, breaking time, and permeability regain. Finally, surfactant wettability impact on liquid intake in shale was carried out carefully. The liquid intake rate affected by the existence of fractures, fluid concentration, sample length, and treatment method were specified in detail"--Abstract, page iii.


Bai, Baojun
Ma, Yinfa

Committee Member(s)

Flori, Ralph E.
Nygaard, Runar
Wei, Mingzhen


Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Petroleum Engineering


Research Partnership to Secure Energy for America
China Scholarship Council


Missouri University of Science and Technology

Publication Date

Fall 2014


xvi, 180 pages

Note about bibliography

Includes bibliographical references (pages 169-179).


© 2014 Yongpeng Sun, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Formation damage (Petroleum engineering)
Oil wells -- Hydraulic fracturing
Enhanced oil recovery -- Computer simulation

Thesis Number

T 10625

Electronic OCLC #