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New reinjection treatment method of polysulfonate drilling wastewater

A technology for drilling wastewater and treatment methods, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., which can solve the damage of oil-producing formations, increase the difficulty of wastewater treatment, and increase the treatment cost. It can reduce pollution and alleviate the shortage of water resources.

Inactive Publication Date: 2011-06-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
  • Claims
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Problems solved by technology

With the increase of drilling depth, the more types and quantities of treatment agents are used, the more complex the composition of the corresponding drilling wastewater, and the higher the concentration of pollutants, which makes the content of suspended solids in the drilling wastewater seriously exceed the standard and the system is very stable. The difficulty of wastewater treatment increases, the cost of treatment increases, and the quality of effluent water often fails to meet the water quality indicators of reinjection water, which causes damage to oil-producing formations during reinjection
This shows that the commonly used treatment process can no longer meet the increasingly stringent environmental protection requirements of the oil field, so there is an urgent need for a new process that can effectively treat polysulfide drilling wastewater and meet the water quality standards for reinjection water after treatment.

Method used

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Effect test

Embodiment 1

[0035] This embodiment is aimed at the polysulfonate mud system 1# drilling wastewater produced at a depth of 3000 meters in a certain well in Shengli Oilfield. The water quality of this wastewater is as shown in Table 1. The specific operations are as follows:

[0036] Table 11# Drilling wastewater quality

[0037]

[0038] First, add 28mL / L (1+1) hydrochloric acid (diluted by adding an equal volume of water to 36%-38% concentration of hydrochloric acid) to 1# drilling wastewater to adjust the pH to 2, and mix slowly to make it React for 20 minutes; then enter the centrifuge for centrifugation to remove the suspended solids that have settled, the centrifugal speed is 2500r / min, and the centrifugation time is 3min;

[0039]Then add 8g / L quicklime to adjust the pH to 7.0, add 625mg / L coagulant polyaluminum chloride and 6mg / L coagulant cationic polyacrylamide, its relative molecular weight is 800-10 million, and carry out coagulation treatment. Further remove the suspended s...

Embodiment 2

[0043] This embodiment is aimed at the 2# polysulfide mud system drilling wastewater produced at a depth of 4100 meters in a certain well in Shengli Oilfield. The water quality of this wastewater is shown in Table 2. The specific operations are as follows:

[0044] Table 22# Drilling wastewater quality

[0045]

[0046] First, add 35mL / L (1+1) hydrochloric acid (diluted by adding an equal volume of water to 36%-38% hydrochloric acid) into 2# drilling wastewater to adjust the pH to 1, and mix slowly to make it React for 30 minutes; then enter the centrifuge for centrifugation to remove the suspended solids that have settled, the centrifugal speed is 3000r / min, and the centrifugation time is 5min;

[0047] Then add 10g / L quicklime to adjust the pH to 8, add 950mg / L coagulant polyaluminium chloride and 10mg / L coagulant cationic polyacrylamide, its relative molecular weight is 800-10 million, and carry out coagulation treatment. Further remove the suspended solids in the water...

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Abstract

The invention provides a reinjection treatment method of polysulfonate drilling wastewater. The method comprises the following steps: adding inorganic acid in the drilling wastewater to adjust the pH value to 1-2, reacting for 20-30min to ensure that the suspended matter in water is destabilized and precipitated; then centrifuging to remove the precipitated suspended matter, adjusting the pH value again to 7-8, adding coagulant and coagulant aid to ensure that the coagulant and the suspended matter in water are coagulated to form flocs, removing the flocs, adding oxidant to perform oxidation treatment, and filtering to further remove the suspended matter in water and reduce the medium value of particle size. The invention adopts the treatment technology mainly containing acidification, coagulating sedimentation and secondary filtration and combines the reinforced solid-liquid separation measures such as acid-base regulation and centrifugal separation; and the effluent can meet the C1 grade injected water quality standards of the recommendation quota for injection water quality of fragmental rock fragmental rock oil field (SY / T 5329-94). By adopting the reinjection treatment method of the invention, the environmental pollutions caused by drilling wastewater can be greatly reduced and the situation that the oil field is lack of water resources can be alleviated.

Description

technical field [0001] The invention relates to the field of oilfield wastewater treatment, in particular to a new reinjection treatment method for polysulfide drilling wastewater, which is a technology suitable for treating drilling wastewater in a polysulfide mud system and can be finally reinjected into formations. Background technique [0002] For the treatment of drilling wastewater, the treatment method usually used in the oil field is chemical coagulation method, among which the chemical coagulation sedimentation method is a treatment technology commonly used in China at present. liquid separation. This method is simple and flexible, and can remove most of the suspended solids, but it is difficult to treat wastewater with a high concentration of pollutants or after adding a sulfonated treatment agent. On the basis of chemical coagulation, measures to strengthen solid-liquid separation are adopted to improve the removal efficiency of suspended solids. Generally, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 郭继香崔永杰曾倩倩王惠云
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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