Method for destabilization coagulating treatment of well drilling waste liquid
A technology for drilling waste fluid and treatment method, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Strong acidity and other problems, to achieve the effect of strong adsorption and bridging, simple and reliable operation, and small dosage
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Embodiment 1
[0010] Embodiment 1, in the three reaction vessels that agitator is equipped with, add 1000ml drilling waste liquid; Then 12.5g CaCl 2 and 2.5g MgCl 2 Mix and add water to make a destabilizing agent solution with a concentration of 20%; add the above-mentioned destabilizing agent into the drilling waste fluid, stir and mix for 15 minutes, the stirring speed is 50 rpm, and the drilling waste fluid loses stability; then Add coagulant solution in reaction vessel again, coagulant is to use 2.375g to polymerize AlCl 3 Mix with 0.125g polyacrylamide and add water to form a solution with a concentration of 20%. After adding, stir for 15 minutes at a stirring speed of 10 rpm; finally, input the above mixture into a filter for solid-liquid separation. After separation, the color of the liquid phase is relatively Shallow, the acidity and alkalinity are neutral and have reached the discharge standard, and the solid phase is solidified by adding cement and lime.
Embodiment 2
[0011] Example 2, the drilling waste fluid taken in this example comes from the outlet of the shaker screen in Well WVD5149 in Karamay Oilfield. The design well depth of this well is 2100 meters, and the drilling depth is 1836.5 meters when sampling. Get 2 cubic meters of drilling waste fluid and fill it in a destabilizing coagulation mixing tank, add a solution made of a destabilizing agent with a mass percent concentration of 20%, wherein the quality of the destabilizing agent used is 30 kilograms, and stir evenly for 15 minute. In the destabilized coagulation mixing tank, add a solution made of a coagulant with a mass percentage concentration of 20%, wherein the quality of the coagulant used is 3.17 kg, and after uniform stirring for 15 minutes, it is transported to the solid-liquid separation device for the next step. level processing. According to the results of solid-liquid separation, the dehydration rate of drilling waste fluid after solid-liquid separation reaches 72...
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