Chemically reinforced solid-liquid separation method for well drilling waste liquid

A drilling waste fluid and solid-liquid separation technology, which is applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve problems such as difficult to achieve effective separation of drilling waste fluid, and achieve harmless treatment with reduced difficulty and high-efficiency solid-liquid separation. The effect of separation and difficulty reduction

Active Publication Date: 2011-04-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, some domestic enterprises have carried out some research on the solid-liquid separation treatment of drilling waste fluid. The Drilling Institute of Zhongyuan Petroleum Exploration Bureau has conducted beneficial explorations in the field of solid-liquid separation treatmen

Method used

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  • Chemically reinforced solid-liquid separation method for well drilling waste liquid
  • Chemically reinforced solid-liquid separation method for well drilling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The following components are based on the quality of drilling waste fluid 100%;

[0026] The buffer adjustment pool 1 handles a liquid-solid mass content of 5%, and a capillary suction time (CST)≤2500s.

[0027] The destabilizing agent formula (mass percentage, the same below) added to the destabilizing reaction tank 2 is 0.3% of nitric acid, 0.4% of polysilicon aluminum chloride and 0.2% of polyferric sulfate.

[0028] The adsorbent formula added to the adsorption reaction pool 3 is 1% quicklime and 0.5% calcium chloride.

[0029] The flocculant formula added to the flocculation reaction tank 4 is 0.015% cationic polyacrylamide.

[0030] The centrifugal factor of the centrifuge 5 is 2000-2200g, the water content of the effluent mud is ≤70%, the solid content of the effluent water is ≤0.5%, and the recovery rate of the solid phase is ≥90%.

[0031] The residence time of the whole process is 21-28 minutes, of which the dilution buffer stage is 3-4 minutes, the destabil...

Embodiment 2

[0033] The following components are based on the quality of drilling waste fluid 100%;

[0034] The buffer regulating pool 1 treats the effluent with a solid content of 10%, and a capillary suction time (CST)≤2500s.

[0035] The destabilizing agent formula (mass percentage, the same below) added to the destabilizing reaction tank 2 is 0.3% of sulfuric acid, 1.0% of polysilicon aluminum chloride and 0.3% of polyferric sulfate.

[0036] The adsorbent formula added to the adsorption reaction pool 3 is 1.5% quicklime and 1% calcium chloride.

[0037] The flocculant formula added to the flocculation reaction tank 4 is 0.015% of anionic polyacrylamide.

[0038] The centrifugal factor of centrifuge 5 is 2000-2200g, the moisture content of the effluent mud is ≤70%, the solid content of the effluent is ≤0.5%, and the recovery rate of the solid phase is ≥90%.

[0039] The residence time of the whole process is 21-28 minutes, of which the dilution buffer stage is 3-4 minutes, the desta...

Embodiment 3

[0041] The following components are based on the quality of drilling waste fluid 100%;

[0042] The solid content of the effluent treated by the buffer regulating tank 1 is 7%, and the capillary suction time (CST) is ≤2500s.

[0043] The destabilizing agent formula (mass percentage, the same below) added to the destabilizing reaction tank 2 is 0.5% nitric acid, 0.6% polysilicon aluminum chloride and 0.3% polyferric sulfate.

[0044] The adsorbent formula added to the adsorption reaction pool 3 is 1% quicklime and 0.8% calcium chloride.

[0045] The flocculant formula added to the flocculation reaction tank 4 is 0.005% amphoteric polyacrylamide.

[0046] The centrifugal factor of centrifuge 5 is 2000-2200g, the moisture content of the effluent mud is ≤70%, the solid content of the effluent is ≤0.5%, and the recovery rate of the solid phase is ≥90%.

[0047] The residence time of the whole process is 21-28 minutes, of which the dilution buffer stage is 3-4 minutes, the destabi...

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Abstract

The invention relates to a chemically reinforced solid-liquid separation method for a well drilling waste liquid, comprising the following steps of: mixing the well drilling waste liquid with clear water, regulating the solid content of the well drilling waste liquid to 5%-10%, and then carrying out capillary pumping for not more than 2500s; adding a destabilizing agent comprising 0.3%-0.5% of sulfuric acid or nitric acid, 0.4%-1.0% of polyaluminium silicate chloride and 0.2%-0.3% of polyferric sulfate; adding adsorbents comprising 1%-1.5% of quick lime and 0.5%-1% of calcium chloride; adding a flocculating agent comprising 0.005%-0.015% of cationic polyacrylamide, anionic polyacrylamide or amphoteric polyacrylamide; accomplishing solid-liquid separation by using a centrifugal machine and then respectively discharging separated solid phase and liquid phase, wherein the centrifugal factor of the centrifugal machine is 2000-2200g, the water content of discharged mud is not greater than 70%, the solid content of the discharged water is not greater than 0.5%, and the recovery rate of the solid phase is not less than 90%. The chemically reinforced solid-liquid separation method reduces the difficulty in subsequent advanced treatment on the well drilling waste liquid, thereby creating the favorable conditions for resource recycling of the liquid phase.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling, in particular to a chemically enhanced solid-liquid separation method for drilling waste liquid. It belongs to the oil and gas field surface engineering technology of the petroleum industry. Background technique [0002] In the process of oil and gas development and production, drilling operations produce a large amount of drilling waste fluid. As the drilling depth increases and the difficulty increases, the types and quantities of chemical additives added to the drilling fluid are also increasing, and the composition of the drilling waste fluid is becoming more and more complex. The hydrocarbons, inorganic salts, high Molecular polymers, heavy metals and other components, once they enter the surrounding environment due to improper disposal, will bring serious ecological and environmental impacts. At present, the "National List of Hazardous Wastes" has clearly included drilling waste...

Claims

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Application Information

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IPC IPC(8): B01D36/00
Inventor 邓皓刘光全张晓飞许毓王蓉沙谢水祥赵欣梅岳勇吴百春
Owner BC P INC CHINA NAT PETROLEUM CORP
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