Magnetorheological temporary plugging fluid and preparation method thereof

The invention provides a magnetorheological temporary plugging fluid and a preparation method thereof. The magnetorheological temporary plugging fluid is prepared from substances in percentage by massas follows: 8%-41% of soft magnetic particles, 12%-45% of a base carrier fluid, 0.1%-5% of a surfactant, 0.3%-4.8% of a thixotropic agent, 0.6%-3.5% of an antiwear additive and the balance of water.In the magnetorheological temporary plugging fluid, the soft magnetic particles determining the magnetic property of the magnetorheological temporary plugging fluid are dispersed in the base carrier fluid, properties and solid-fluid interface property of the soft magnetic particles are changed by the surfactant, stability is improved by the thixotropic agent, and the magnetorheological fluid can produce a plugging effect in the position requiring for temporary plugging within milliseconds under the action of an externally applied magnetic field; after the magnetic field is removed, the solidified magnetorheological flu