Aluminum-based anti-collapse agent for drilling fluid
An anti-slump agent and drilling fluid technology, applied in the field of oil drilling, can solve the problems of difficult control of rheology, difficult control of dosage, difficulty of large-scale use, etc.
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Embodiment 1
[0017] Synthesis of indoor sample of new high-efficiency aluminum-based anti-slump agent:
[0018] The amount of organic acid added is 100.8g, and the pH value is adjusted by using 0.1mol / L NaOH solution or 0.1mol / L HCl solution. During this process, the stirring speed is greater than 500r / min, and the water bath is heated. Add the organic acid first, then add 200g of aluminum-containing compound after heating up to 90°C. Then keep the temperature at 200r / min and stir evenly for 5-10h, cool, dry at 105°C, and pulverize to obtain aluminum-based anti-slump agent powder.
Embodiment 2
[0020] Evaluation of hydration swelling inhibition: Determination of shale swelling ratio. Compared with deionized water (expansion rate 23.21%), when the aluminum-based anti-slump agent solution is used as the test solution, the expansion rate of the artificial rock sample is 12.87%, a decrease of 44.54%, indicating that the aluminum-based anti-slump agent has good Hydration swelling inhibition.
Embodiment 3
[0022] Evaluation of mudstone wellbore anti-collapse inhibition: determination of shale stability index.
[0023] (1) Preparation of artificial rock samples with high water content Pass the experimental mudstone powder through a 100-mesh sieve, dry it, and stir and mix it with 3.3% NaCl solution at a mass ratio of 7:3 to obtain a wet rock sample (slurry); put the wet rock sample in a container Fully hydrate in a desiccator with a constant water activity solution for 16 hours; weigh 150g of wet rock sample into a sample press, and press it under a certain pressure for 2 hours; After 3 minutes, the applied pressure should be 2.0MPa higher than the forming pressure; use a penetration meter to measure the depth and penetration of the surface of the assembled rock sample; put 350mL test solution into the rolling tank, and tighten the upper cover of the rolling tank to seal it. Assemble the rock sample and immerse it in the test solution, roll it hot or soak it for a certain period ...
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