Southwest Petroleum University

Dai Jun Du

Rui Liu

Lin Sun

Ke Xing Li

Bo Ren

Long He

Hai Yang Zhao

Bao Lei Jiao

Fa Yang Jin

Zhen Qian

En Long Zhen

Wan Fen Pu

Xiao Qing He

Wen Ge Hu

A plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and a preparation method thereof of the present disclosure are provided, the plugging agent system consists of the following components: main agent: 6%&#x2dc;10%, cross-linking agent: 0.6%&#x2dc;1%, initiator: 0.006%&#x2dc;0.01%, additive: 6%&#x2dc;14%, and the rest being water; the preparation method includes the following steps: adding montmorillonite to water to prepare a montmorillonite dispersion system; adding the main agent, the cross-linking agent and the initiator to the montmorillonite dispersion system to prepare a main agent solution; putting the main agent solution into an oven with a temperature range with 90&#x2dc;20&#xb0; C. for 9&#x2dc;48 h to obtain gelation, the adhesive strength of the agent system can reach grade H, with 50&#x2dc;80 expansion multiple, good strength after being expanded and good water plugging effect under the condition of a temperature of 140&#xb0; C. and 250,000 degree of mineralization.

Plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and preparation method thereof

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Chengdu, China

Dai Jun Du