Doctoral Dissertations


Jianqiao Leng

Keywords and Phrases

Conformance Control; Gel Treatment; Injection Profile; Numerical Simulation


“Gel treatment has been widely applied to control reservoir conformance and thus improve the sweep efficiency of injection fluids. Quite a few numerical simulations have been conducted to investigate the factors impacting gel treatment and assist to optimize treatment design and predict the performance. However, there exists significant barrier between the simulation approaches and lab experiments. In this study, two comprehensive reviews have been conducted to identify the gaps between lab and current simulations for in-situ polymer treatment and preformed particle gel treatment, separately.

Based on the identified gaps, the effect of a few major factors which are very important in lab tests but have not been considered in previous simulations on gel treatment was investigated. Results showed that residual resistance factor should be considered as a function of permeability because it significantly impacts the profile modification result of gel treatment. Gelant rheology should be considered as a function of rock types, because it influenced the gelant placement and thus impacted gel treatment results. A new mathematical model was developed to consider the impact of multiple influencing factors on inaccessible pore volume (IAPV), which improved the simulation of the gelant placement. A new method was built to simulate gel extrusion in open fractures, which can consider the effect of dehydration. A decision tree model was built to present a roadmap that could be used to identify where and when gel treatment was more effective”--Abstract, page iv.


Wei, Mingzhen
Bai, Baojun

Committee Member(s)

Flori, Ralph E.
Dunn-Norman, Shari
Wu, Yu-Shu


Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Petroleum Engineering


Funding for this study is supported by the Department of Energy under Award Number DE-FE0031606.


Missouri University of Science and Technology

Publication Date

Spring 2022

Journal article titles appearing in thesis/dissertation

  • A comprehensive review of in-situ polymer gel simulation for conformance control
  • Review of transport mechanisms and numerical simulation studies of preformed particle gel for conformance control
  • Simulation study of macromolecules inaccessible pore volume mechanism in heterogeneous porous
  • Simulation study of delayed crosslinking process in gel treatment for conformance control
  • Impact of rheology models on horizontal well polymer flooding in a heavy oil reservoir on alaska north slope: A simulation study
  • Impact of polymer rheology on gel treatment performance of horizontal wells with severe channeling
  • Investigations of when and where in-situ gel treatment can be effective in heavy oil reservoirs with severe channeling problems
  • Simulation studies of preformed gel propagation in open fractures


xxv, 355 pages

Note about bibliography

Includes bibliographic references.


© 2022 Jianqiao Leng, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 12118