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Treatment method of fracturing flow-back fluid

A technology of fracturing flowback fluid and treatment methods, which is applied in the fields of filtration treatment, water/sewage treatment, mining wastewater treatment, etc., and can solve problems such as waste of water resources, environmental problems, and complex processes, so as to reduce source waste and reduce costs , the effect of simple processing method

Inactive Publication Date: 2016-05-04
ANDONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complex in process, and the produced water contains a certain amount of borate. When preparing fracturing fluid, it will cause the base fluid to initiate a cross-linking reaction in advance, making the liquid preparation fail; The water demand for dosing has also increased significantly. This method of simply using clean water for dosing not only wastes water resources, but also produces a large amount of waste liquid, which brings serious environmental problems.

Method used

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  • Treatment method of fracturing flow-back fluid
  • Treatment method of fracturing flow-back fluid
  • Treatment method of fracturing flow-back fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 100L fracturing flowback fluid sample A, and test its water quality. The test results are shown in Table 1. Sample A is processed as follows, wherein the flow chart of the processing process is as follows figure 1 Shown:

[0025] 1) Pre-oxidation treatment: Add 0.2ml of active oxidant hydrogen peroxide to each liter of fracturing flowback fluid, and stir for 3 hours. The active oxidant reduces the chemical oxygen demand of the fracturing flowback fluid and breaks the residual glue in it. The indicators of fracturing flowback fluid before pre-oxidation treatment are shown in Table 1;

[0026] 2) Advanced treatment: Add 3 g of sodium bicarbonate to each liter of fracturing flowback fluid after pre-oxidation treatment, then adjust its pH to 9 with sodium hydroxide, stir for 3 hours, and a white precipitate appears;

[0027] 3) Flocculation and sedimentation: Add 1.5g of polyaluminium chloride and 5mg of cationic polyacrylamide with a molecular weight of 8 million to...

Embodiment 2

[0033] Take 100L fracturing flowback fluid sample B, and test its water quality. The test results are shown in Table 1. Sample B is processed as follows, wherein the flow chart of the processing process is as follows figure 1 Shown:

[0034] 1) Pre-oxidation treatment: add 0.5ml of active oxidant hydrogen peroxide to each liter of fracturing flowback fluid, and stir for 4 hours. The active oxidant reduces the chemical oxygen demand of the fracturing flowback fluid and breaks the residual glue in it. The indicators of fracturing flowback fluid before pre-oxidation treatment are shown in Table 1;

[0035] 2) Advanced treatment: Add 10 g of sodium bicarbonate to each liter of fracturing flowback fluid after pre-oxidation treatment, then adjust its pH to 10 with sodium hydroxide, stir for 3 hours, and a white precipitate appears;

[0036] 3) Flocculation and sedimentation: Add 0.8g of polyaluminum chloride and 10mg of cationic polyacrylamide with a molecular weight of 8 million ...

Embodiment 3

[0042] Take 100L fracturing flowback fluid sample C, and test its water quality. The test results are shown in Table 1. Sample C is processed as follows, wherein the flow chart of the processing process is as follows figure 1 Shown:

[0043] 1) Pre-oxidation treatment: Add 0.8ml of active oxidant hydrogen peroxide to each liter of fracturing flowback fluid and stir for 3 hours. The active oxidant reduces the chemical oxygen demand of the fracturing flowback fluid and breaks the residual glue in it. The indicators of fracturing flowback fluid before pre-oxidation treatment are shown in Table 1;

[0044] 2) Advanced treatment: Add 15g of sodium bicarbonate to each liter of fracturing flowback fluid after pre-oxidation treatment, then adjust its pH to 9 with sodium hydroxide, stir for 4 hours, and a white precipitate appears;

[0045] 3) Flocculation and sedimentation: Add 0.8g of polyaluminum chloride and 17mg of cationic polyacrylamide with a molecular weight of 8 million to ...

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Abstract

The invention provides a treatment method of fracturing flow-back fluid. The method comprises the following steps: preoxidation treatment: an active oxidizing agent is added into the fracturing flow-back fluid, and stirring is carried out; advanced treatment: a water softener is added into the fracturing flow-back fluid after the preoxidation treatment, pH is adjusted to 9-10, and stirring is carried out; flocculating settling: a coagulant and a coagulant aid are added into the fracturing flow-back fluid after the advanced treatment, stirring is carried out for 10-40 minutes, the fluid is allowed to stand, and a supernatant and a floc are formed; press filtration treatment of the floc: press filtration is carried out for the floc after flocculating settling, and a mud cake and filtrate are obtained; adsorption treatment: the supernatant and the floc are contacted with renewable resin, and boron and metal ions in the supernatant and the filtrate are adsorbed. The method has the advantages of simple treatment method and low treatment cost; the renewable resin for the adsorption treatment has obvious adsorption effects for borate and metal elements in the fracturing flow-back fluid; the clear water obtained after the treatment of the fracturing flow-back fluid meets the standard of the reuse water for dispensing liquid, and water resource waste is reduced.

Description

technical field [0001] The invention relates to a treatment method for oil and gas field wastewater, in particular to a treatment method for fracturing flowback fluid. Background technique [0002] With the continuous development of oil and gas field development, most of them focus on the stimulation of oil and gas fields in the later stage, and most of them adopt the method of fracturing stimulation, but a large amount of fracturing flowback fluid is subsequently produced. The composition of fracturing flowback fluid is complex, containing salt, suspended solids, metal ions and other additives, etc. It is difficult to meet the standards for reuse or discharge through simple separation and treatment. At present, there are mainly the following methods for the treatment of fracturing flowback fluid: ①Biochemical method; ②Photocatalytic method; ③Ozone oxidation method; however, these methods mainly focus on reducing the content of its chemical oxygen demand (COD) In general, t...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F1/001C02F1/285C02F1/5236C02F1/56C02F1/66C02F1/722C02F5/08C02F2103/10
Inventor 邓勇邬江华张直建杨鹏王圆谢海兵罗勇
Owner ANDONG ENVIRONMENTAL PROTECTION TECH CO LTD
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