Method for removing boron ions in fracturing flow-back fluid

A fracturing flowback fluid, boron ion technology, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. Achieve the effect of good stability, easy operation and high removal rate

Active Publication Date: 2021-05-14
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The purpose of the present invention is to provide a method for removing boron ions in fracturing flowback fluid, using boron removal agent combined with ion exchange method to solve the problem of early crosslinking caused by the presence of boron in the flowback fluid, which in turn affects the return flow rate. Engineering Problems of Liquid Draining and Secondary Dosing

Method used

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  • Method for removing boron ions in fracturing flow-back fluid
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  • Method for removing boron ions in fracturing flow-back fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0054] This test was carried out in an oilfield in Ordos, and the processing capacity of the equipment was 20m 3 / h. The technological process of boron removal by chemical agents is as follows: figure 2 shown.

[0055] The clear water after the above technological process is processed is then treated with a boron removal device. The specific technological process is as follows: image 3 shown.

[0056] see figure 2 and image 3 , the specific process flow is: the raw water first enters the coalescing degreasing device, and the function of the coalescing degreasing device is coarse-grained degreasing. Under the action, the oil droplets will change from small to large, float to the water surface, and be discharged into the oil collection tank through the oil discharge pipe.

[0057] The water coming out of the coalescing degreasing device flows into the micro-electrolytic oxidation device by itself, and through the electrochemical reaction generated by the potential diff...

Embodiment 2

[0065] Measure 500mL of fracturing flowback fluid taken from Field Well-2 into a beaker, the boron content in it is 17.36mg / L measured by curcumin spectrophotometry, and the calcium ion content measured by titration method is 310.23mg / L , the content of suspended solids was 170.66mg / L. The dosage of each agent is determined according to the measured ion content.

[0066] First add oxidant sodium hypochlorite solution (mass concentration is 0.1%) in the sodium hydroxide dosing box, its addition is 0.08% of guar gum fracturing flowback liquid quality to carry out, add calcium magnesium ion precipitant sodium carbonate subsequently, it adds The amount is carried out according to the molar ratio of calcium and magnesium ions in the flow-back liquid at 1:1, and the pH of the solution is adjusted to 9.5 with a 4% sodium hydroxide aqueous solution, and the reaction is carried out at room temperature for 12 minutes. Then add the prepared inorganic flocculant polyaluminum chloride sol...

Embodiment 3

[0069] Measure 500mL of the fracturing flowback fluid retrieved from Field Well-3 into a beaker. The boron content in it is 19.65mg / L as measured by curcumin spectrophotometry, and the calcium ion content as measured by titration is 1000.5mg / L. L, the content of suspended matter is 230.6mg / L. The dosage of each agent is determined according to the measured ion content.

[0070] First add oxidant hydrogen peroxide (mass concentration is 0.1%) in the sodium hydroxide dosing box, its addition is 0.1% of the guar gum fracturing flowback liquid quality to carry out, then add calcium and magnesium ion precipitant sodium sulfate, its addition According to the molar ratio of calcium and magnesium ions in the flowback liquid to 1:1, the pH of the solution was adjusted to 10 with a 4% aqueous sodium hydroxide solution, and the reaction was carried out at room temperature for 8 minutes. Then add the prepared inorganic flocculant polyaluminum chloride solution into the PAC dosing box, an...

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Abstract

The invention belongs to the technical field of oil and gas field wastewater treatment, and particularly relates to a method for removing boron ions in fracturing flow-back fluid. The method adopts a chemical agent-coupling ion exchange technology, and comprises the following steps: firstly, adding an oxidizing agent into the flow-back liquid, then adding a metal ion precipitator, adjusting the pH value of the flow-back liquid to be alkaline, and reacting for a period of time; adding an inorganic flocculant, then adding a compounded boron removal agent, reacting for a period of time, finally adjusting the pH value to be slightly acidic, and finally settling boron ions, the boron removal agent and colloidal particles under the net capturing effect; and then combining an ion exchange treatment technology so that the final boron removal rate can reach about 88%, the content of suspended matters after treatment is reduced to below 20mg / L, the content of calcium and magnesium ions is reduced to below 300mg / L, and the treated flowback fluid meets the requirements of secondary fluid preparation.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field wastewater treatment, and in particular relates to a method for removing boron ions in fracturing flowback fluid. Background technique [0002] Fracturing technology is an important technology for oil and gas fields to increase production. The fracturing fluid is the transmission medium in the fracturing process. It can not only transmit the power required in the fracturing process, but also play the role of creating fractures and carrying sand. Therefore, the quality of the fracturing fluid plays a decisive role in fracturing. effect. Usually, after the fracturing process is completed, 30% to 50% of the fracturing fluid will flow back to the ground to form fracturing flowback fluid. [0003] The composition of the fracturing flowback fluid is very complex, including thickeners, crosslinking agents, drainage aids, clay stabilizers, bactericides, pH regulators and other regulators added...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10C02F101/10
CPCC02F9/00C02F1/5236C02F1/66C02F1/725C02F1/722C02F1/5245C02F1/56C02F2103/10C02F2101/108C02F2001/422
Inventor 李稳宏张凯博任祎淡勇潘柳依
Owner NORTHWEST UNIV(CN)
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