Low hydration heat early strength cement fluid loss reducer for oil-gas well cementing and preparation method
A fluid loss reducing agent, low hydration heat technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effect of reducing water loss
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Embodiment 1
[0061] In this example, the fluid loss reducer was prepared according to the technical method of the present invention, and the ratio of each monomer is shown in Table 1. The obtained fluid loss reducer was added to the cement slurry, and the performance of the fluid loss reducer was tested, and the results are shown in Table 2.
[0062] Formulation of fluid loss reducer in Table 1 Example 1 (unit: g)
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[0064] Table 2 The properties of fluid loss reducer obtained in Example 1
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[0066] It can be seen from Table 2 that when allyl polyoxyethylene ether with n=18 is used, the prepared fluid loss reducing agent has a good effect of reducing fluid loss, and samples 1#-8# can make the low heat of hydration early strengthen The water loss of cement at 20°C is less than 50ml / 30min, and basically no free liquid is produced; among them, the water loss of samples 6#, 7# and 8# is less than 20ml / 30min. The low-temperature strength of the cement added with the flui...
Embodiment 2
[0068] In this example, allyl polyoxyethylene ethers with n=6 and 12 are used to replace the allyl polyoxyethylene ethers with n=18 in Example 1, and the ratio of each monomer is shown in Table 3. The obtained fluid loss reducer was added to the cement slurry, and the performance of the fluid loss reducer was tested, and the results are shown in Table 4.
[0069] Formulation of fluid loss reducer in Table 3 Example 2 (unit: g)
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[0071] Table 4 The properties of fluid loss reducer obtained in Example 2
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[0074] It can be seen from Table 4 that after replacing the allyl polyoxyethylene ether with n=18 with the allyl polyoxyethylene ether with n=6 and 12, the water loss reducing performance of the obtained fluid loss reducing agent has decreased. The water loss of samples 9#-16# exceeds 50ml / 30min, but is still below 250ml / 30min, which can meet the cementing requirements in general cases, but cannot be used in special cases such as liner cemen...
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