Masters Theses

Keywords and Phrases

Conformance control; EOR; Excessive water production; Re-crosslinkable preformed particle gel; Void space Conduits


"Gel treatment has been widely used to control excessive water production and improve oil recovery in mature oilfields. In comparison to traditional preformed particle gel (PPG), re-cross linkable preformed particle gel (RPPG) has a significant advantage in treating abnormal features such as open fractures, fracture-like channels, and void space conduits (VSC). This research provides a comprehensive evaluation of two novel RPPG products developed in our lab: medium-temperature resistant RPPG (MT-RPPG) for a Middle East reservoir and a high-temperature resistant RPPG (HT-RPPG) for North Sea reservoirs (130 oC).

We assessed the effect of the monomer types and concentration, pH, salinity, and temperatures on swelling kinetics, as well as re-crosslinking time, gel strength, thermostability. The plugging efficiency was evaluated using the fractured cement model. For the MT-RPPG, results demonstrated that the elastic modulus of the MT-RPPG after re-crosslinking can reach up to 675 Pa at a swelling ratio of 1:10. The MT-RPPGs with the swelling ratios of 1:10, 1:20, and 1:30 have good thermostability in the injection water from the Middle East at 100 oC for over 150 days so far. The core flooding test showed that the breakthrough pressure was 118.2 psi/ft. For the environmentally friendly HT-RPPG, results showed that the HT-RPPG with a swelling ratio of 1:10 has the maximum G' of 460 Pa after re-crosslinking. The HT-RPPG with a swelling ratio of 1:10 has good long-term thermostability in North Sea formation water at 130 oC for over 208 days so far. Core flooding test showed that the breakthrough pressure was 68 psi/ft and the plugging efficiency is over 99.9%"--Abstract, p. iii


Bai, Baojun

Committee Member(s)

Flori, Ralph E.
Wei, Mingzhen


Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Petroleum Engineering


Missouri University of Science and Technology

Publication Date

Spring 2022


xi, 61 pages

Note about bibliography

Includes_bibliographical_references_(pages 55-61)


© 2022 Zhanmiao Zhai, All Rights Reserved

Document Type

Thesis - Open Access

File Type




Thesis Number

T 12236