Cement expansion agent suitable for high temperature environment and preparation method thereof
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A high-temperature environment, expansion agent technology, applied in the field of composite cement expansion agent and its preparation, to achieve the effect of preventing gas channeling, no effect on thickening time and compressive strength, and moderate onset time
Inactive Publication Date: 2015-11-25
NANJING YUNYUE NEW MATERIAL TECH CO LTD
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[0009] Aiming at the problem in the prior art that there is no oil well cement expansion agent suitable for high-temperature environment, the present invention provides a cement expansion agent suitable for high-temperature environment and its preparation method. When the ex...
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Embodiment 1
[0040] 85 kg of dead-burned MgO (MgO content ≥ 98.5%) raw materials obtained by calcining and sintering the screened magnesite at a high temperature of 2850°C, fumed silica (SiO 2 Content ≥ 94%) 10kg, calcareous raw material hemihydrate gypsum 5.0kg, expansion inhibitor sodium citrate 0.01kg, add ball mill to grind in proportion, mix, and then sieve.
[0041] Among them, the grinding fineness is controlled at 0.010-0.075mm, the residue on a 325-mesh sieve is less than 7.5%, and the activity is measured for 109 minutes.
[0042] The high-temperature expansion agent for oil well cement of the present invention is obtained after metering and packaging.
Embodiment 2
[0044] 92 kg of dead-burned MgO (MgO content ≥ 97.5%) raw materials formed by sintering and sintering magnesite at a high temperature of 2800° C., fumed silica (SiO content ≥ 94% ) 4.5kg, calcareous raw material hemihydrate gypsum 3.5kg, expansion inhibitor sodium citrate 0.02kg, add ball mill grinding in proportion, mix, then sieve.
[0045] The grinding fineness is controlled to be 0.010-0.075mm, the 325-mesh sieve balance is less than 5.5%, and the activity is measured for 86 minutes.
[0046] The high-temperature expansion agent for oil well cement of the present invention is obtained after metering and packaging.
Embodiment 3
[0048] 96 kg of dead-burned MgO (MgO content ≥ 96.5%) raw materials formed by calcining and sintering the screened magnesite at a sintering temperature of 2700° C., fumed silica (SiO2 content ≥ 94% ) 1.5kg, calcareous raw material hemihydrate gypsum 2.5kg, expansion inhibitor sodium citrate 0.01kg, add ball mill grinding in proportion, mix, and then sieve.
[0049] Among them, the grinding fineness is controlled to be 0.010-0.075mm, and the particle size is preferably controlled to be less than 3.5% on a 325-mesh sieve, and the control activity is measured for 71 minutes.
[0050] The high-temperature expansion agent for oil well cement of the present invention is obtained after metering and packaging.
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Abstract
The invention discloses a cement expansion agent suitable for a high temperature environment and a preparation method thereof. The cement expansion agent comprises the following components by mass percent: 85.0%-99.5% of a magnesium material, 0.5%-10.0% of a silicon material, 0-0.50% of an expansion inhibitor and 0-5.0% of a calcium material, wherein the magnesium material is prepared from any one or multiple combinations selected from magnesite, serpentine and hornblende through high-temperature calcination and sintering; the content of magnesium oxide in the magnesium material is greater than or equal to 85 wt%; the silicon material is one or multiple combinations selected from quartz sand and fumed silica; the content of silicon dioxide in the silicon material is greater than or equal to 92 wt%; the expansion inhibitor is one or multiple combinations selected from sodium citrate, tartaric acid and ethylenediamine tetraacetic acid disodium salt; the calcium material comprises calcium oxide and semi-hydrated gypsum; the content of calcium oxide is 0-45 wt%; the content of semi-hydrated gypsum is 55-100 wt%. When the cement expansion agent is used in a high-temperature oil well cement paste environment, the effect onset time of expansion of oil well cement is moderate, so that microgaps caused by shrinkage after cement paste solidification can be effectively filled up.
Description
technical field [0001] The invention relates to a composite cement expansion agent and a preparation method thereof, in particular to a cement expansion agent suitable for high-temperature environments and a preparation method thereof. Background technique [0002] Ordinary cement will shrink in volume after hardening. The shrinkage of cement paste is divided into plastic shrinkage and hardened body shrinkage. After curing for 120 hours, the shrinkage of cement paste generally exceeds 5%. Volume shrinkage is a fatal flaw in the application of oil well cement in high temperature and high pressure environments. The volume shrinkage of the cement paste prevents the cement sheath from being bonded well with the casing and the formation, and the cement sheath’s cementation quality cannot be guaranteed. In severe cases, micro-gap may be formed, causing formation fluid channeling. Studies have shown that gas channeling can occur if there is a micro-gap of 0.01 mm in the interface ...
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