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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

Active Publication Date: 2012-01-18
FD PETROL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dehydration rate of many existing destabilization methods is low, the destabilization effect is poor, and some dehydration rates are high, but there are disadvantages that the effluent is strongly acidic, or the amount of destabilizing agent used is large. There are also many disadvantages in this aspect, which make the processing cost high and the process complicated, and the processing effect is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for destabilization coagulating treatment of well drilling waste liquid for carrying out innocent treatment on the well drilling waste liquid in oil-gas field well drilling. The method can be used for carrying out innocent treatment on the well drilling waste liquid and increasing a treatment effect. In a technical scheme, the method comprises the following stepsof: firstly, adding a destabilizing agent into a reaction tank filled with well drilling waste liquid, wherein the destabilizing agent is prepared by preparing a mixture of 85 percent of CaCl2 and 15percent of MgCl2 into a solution with the concentration of 20 percent; stirring and mixing for 10-15 minutes to make destabilize the well drilling waste liquid; adding a coagulating agent into the tank, wherein the coagulating agent is prepared by preparing a mixture of 95 percent of polyAlCl3 and 5 percent of polyacrylamide into a solution with the concentration of 20 percent; stirring and mixing for 15-20 minutes; and finally, inputting the mixture into a solid-liquid separating device, wherein after the mixture is separated, a liquid phase reaches an emission standard and a curing agent isadded into a solid phase for carrying out curing treatment. Treatment agents used in the invention have good destabilizing and coagulating effects on the well drilling waste liquid and are low in dosage and convenient for operation; and the method has the advantages of low cost and economy and is used for innocent treatment of the well drilling waste liquid.

Description

technical field [0001] The invention relates to a method for destabilizing and coagulating the drilling waste fluid for harmless treatment of the drilling waste fluid in oil and gas field drilling in the petroleum industry. Background technique [0002] A large amount of drilling fluid is required in the process of oil drilling. After circulating in the wellbore, the drilling fluid carries a large amount of cuttings and organic matter and becomes waste fluid that endangers the environment. If it is not treated effectively, it will inevitably cause serious environmental pollution. [0003] According to the formation principle of drilling waste fluid, drilling waste fluid contains drilling fluid, petroleum, drilling cuttings and drilling fluid additives, etc. Clay minerals are replaced by crystal lattices, making the surface negatively charged. Under alkaline conditions, the surface of clay is easily Form a hydration film, under the action of electrostatic repulsion, make clay...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 刘宇程祝效华陈明燕何龙汤历平
Owner FD PETROL GRP
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