Acid soluble mineral fiber fine bridging agent, bridging fluid and preparation method thereof
A mineral fiber and plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of time-consuming and labor-consuming, complicated preparation of plugging agent for bridge plugging, and inability to fully guarantee high temperature resistance, etc., to achieve Good plugging effect
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Embodiment 1
[0029] Embodiment 1, the acid-soluble mineral fiber fine bridging plugging agent, the raw material contains 30 to 40 parts of limestone, 18 to 30 parts of mica, 10 to 20 parts of asbestos, and 3 to 15 parts of vermiculite in parts by weight. 1 to 5 parts of cotton wool, 1 to 15 parts of acidified fiber, 1 to 10 parts of one-way pressure sealant, 1 to 5 parts of delayed expansion agent, and 0.1 to 2 parts of viscosity reducer; wherein: The particle size of limestone is 0.045mm to 2.5mm, the particle size of mica is 1.4mm to 2.5mm, and the particle size of vermiculite is 0.3mm to 2.0mm.
Embodiment 2
[0030] Embodiment 2, the acid-soluble mineral fiber fine bridge plugging agent, raw materials contain 30 or 40 parts of limestone, 18 or 30 parts of mica, 10 or 20 parts of asbestos, and 3 or 15 parts of vermiculite by weight. 1 or 5 parts of cotton wool, 1 or 15 parts of acidifiable fiber, 1 or 10 parts of one-way pressure sealant, 1 or 5 parts of delayed expansion agent, 0.1 or 2 parts of viscosity reducer; wherein: The particle size of limestone is 0.045mm to 2.5mm, the particle size of mica is 1.4mm to 2.5mm, and the particle size of vermiculite is 0.3mm to 2.0mm.
Embodiment 3
[0031] Example 3, the acid-soluble mineral fiber fine bridge plugging agent is obtained according to the following preparation method: in the first step, the required amount of limestone, mica, asbestos, vermiculite, cotton wool, acidifiable fiber, unidirectional The pressure sealing agent, delayed expansion agent and viscosity reducer are added into the mixer for primary mixing, and after the primary mixing, a primary mixture with fibers floating on the surface is obtained; in the second step, the primary mixture is subjected to secondary mixing in the mixer. First-stage stirring, during the second-stage stirring, a fan is used to send a small wind into the mixer at the same time, after the second-stage stirring, the secondary mixture is obtained, and the third step is to carry out the third-stage stirring of the secondary mixture in the mixer. During the first-stage stirring, a fan is used to send strong wind into the mixer at the same time, and after the third-stage stirri...
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