Gas storage old well plugging cement paste and preparation method thereof
A gas storage and cement slurry technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of insufficient cement density and anti-gas channeling ability, low long-term integrity of the cement sheath, and inability to solve the problem of aging Well plugging and other problems, to achieve the adjustable thickening time, speed up the preparation speed, and solve the effect of long preparation time
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Embodiment 1
[0049] This embodiment 1 provides a formula and preparation method of cement slurry for plugging old wells of gas storage, including the following steps:
[0050] 1) Mix and stir 100 parts of G-grade superfine cement, 3 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm), 1 part of expansion agent and 30 parts of silica fume to obtain a dry mixed material ;
[0051] 2) Dissolve 1 part of retarder, 4 parts of fluid loss reducer, 2 parts of dispersant, 3 parts of anti-channeling agent and 0.2 part of polyether defoamer in 76 parts of water and stir evenly to obtain a wet-mixed material;
[0052] 3) Add the dry-mixed material into the wet-mixed material at a uniform speed under the stirring condition of 4000 rpm / min (15s), and then stir at 12000 rpm for 35s to evenly and defoam, and the prepared cement slurry is The old well of the gas storage is plugged with cement slurry.
[0053] The performance of the cement slurry in Example 1 was measured, and the results a...
Embodiment 2
[0055] This embodiment 2 provides a formula and preparation method of cement slurry for plugging old wells of gas storage, including the following steps:
[0056] 1) Mix and stir 100 parts of G grade superfine cement, 5 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm), 2 parts of expansion agent and 30 parts of silica fume to obtain a dry mixed material ;
[0057] 2) Dissolve 2 parts of retarder, 5 parts of fluid loss reducer, 3 parts of dispersant, 6 parts of anti-channeling agent and 0.2 part of polyether defoamer in 75 parts of water and stir evenly to obtain a wet-mixed material;
[0058] 3) Add the dry mix material into the wet mix material at a uniform speed (15s) under stirring at a speed of 4000 rpm, and then stir at a speed of 12000 rpm for 35 seconds to evenly defoam and the prepared cement slurry is the storage The old well of the gas storage is plugged with cement slurry.
[0059] The performance of the cement slurry in Example 2 was measured, a...
Embodiment 3
[0061] This embodiment 3 provides a formula and preparation method of cement slurry for plugging old wells of gas storage, including the following steps:
[0062] 1) Mix and stir 100 parts of G-grade superfine cement, 2 parts of expansion agent, 8 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm) and 32 parts of silica fume to obtain a dry mixed material ;
[0063] 2) Dissolve 3 parts of retarder, 7 parts of fluid loss reducer, 3 parts of dispersant, 6 parts of anti-channeling agent and 0.2 part of polyether defoamer in 74 parts of water and stir evenly to obtain a wet-mixed material;
[0064] 3) Add the dry mix material into the wet mix material at a uniform speed (15s) under stirring at a speed of 4000 rpm, and then stir at a speed of 12000 rpm for 35 seconds to evenly defoam and the prepared cement slurry is the storage The old well of the gas storage is plugged with cement slurry.
[0065] The performance of the cement slurry in Example 3 was measured, a...
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