Can crosslinked polymer gel solve severe lost circulation in high temperature well?

The crosslinked PAM gel system could solve severe lost circulation in high temperature well. Cross–linked polymer gel has been broadly used to plug severe lost circulation and to improve the strength of the near-wellbore in natural fracture or carbonate cave strata. Gelation time and gel strength are the key factors for gel plugging.

What is cross-linked polymer gel?

Cross–linked polymer gel has been broadly used to plug severe lost circulation and to improve the strength of the near-wellbore in natural fracture or carbonate cave strata. Gelation time and gel strength are the key factors for gel plugging.

How does temperature affect gelation time of cross-linked polyacrylamide gel?

3.4. The gelation time of cross–linked polyacrylamide gel 3.4.1. Effect of temperature on gelation time Temperature is vital to mitigate lost circulation treatments since it will strongly affect gelation time.

How is cross-linked polyacrylamide gel prepared?

Preparation of polyacrylamide gel Cross-linked polyacrylamide gel was prepared by free radical polymerization of AM and MBA in aqueous solution with encapsulated initiator. 7% (w/v) AM, 0.5% (w/v) MBA and 5% (w/v) NaCl were dissolved in 300 mL distilled water at room temperature for 30 min until totally dissolved.

Can colophony encapsulate a cross-linked polyacrylamide gel?

When the gelation time was less than 2 h, cross-linked polyacrylamide gel cannot effectively plug slot. However, with the further increase in gelation time, gel loss obviously decreased. These results verified that initiator was encapsulated by colophony successfully.

What happens if a polyacrylamide gel is high in Salt?

Since high concentration of salt leads to the excessive electric charge of gel system, which will compress polyacrylamide will be compressed, and the viscosity and the cross-linking density of polymer will be reduced ( Guan et al., 2018; Shuang et al., 2018; An et al., 2016; Xin et al., 2018 ). Fig. 12.