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Method and device for treating oil and gas field fracturing flow-back fluid by adopting ceramic membrane

A fracturing flowback fluid and ceramic membrane technology, applied in the field of water treatment, can solve the problems of high treatment cost, large oxidant consumption, oxidation time process, etc., and achieve the effects of improving sedimentation efficiency, improving purification effect, and improving effluent quality.

Active Publication Date: 2016-04-20
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the characteristics of Henan Oilfield fracturing fluid reverse drainage fluid, Zhang Hong studied a harmless treatment method suitable for it: coagulation-oxidation-Te / C micro-electrolysis-Fenton oxidation-activated carbon adsorption five-step treatment process, from this process It is not difficult to see that the core of this process is the oxidation part, the purpose of which is to oxidize and decompose as much organic matter in the fracturing flowback fluid as possible, so this process will consume a large amount of oxidant, and the treatment cost is relatively high
[0005] To sum up, the current fracturing flowback fluid treatment technology still uses oxidation as the core technology, the oxidant consumption is large, the oxidation time is long, and it can only meet the national secondary emission standards; under the increasingly stringent national environmental protection policy , a process segment, cost-effective, high-standard process technology has been put on the agenda

Method used

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  • Method and device for treating oil and gas field fracturing flow-back fluid by adopting ceramic membrane
  • Method and device for treating oil and gas field fracturing flow-back fluid by adopting ceramic membrane
  • Method and device for treating oil and gas field fracturing flow-back fluid by adopting ceramic membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1: Carry out gel breaking and flocculation sedimentation on the fracturing flowback fluid; 2 S 2 o 8 / FeCl 2 / CaO compound formula, where Na 2 S 2 o 8 and FeCl 2 The concentration of CaO is 132mg / l and 258mg / l respectively, the dosage of CaO depends on the pH of incoming water; the reaction time is 30min.

[0050] Step 2: Viscosity reduction treatment is performed on the effluent after gel breaking and flocculation, where O 3 The dosage is 112mg / l, and the reaction time is 15min. The properties of the processed feed liquid are as follows:

[0051]

[0052] Step 3: Use membrane equipment to treat sewage. The ceramic membrane used has an average pore size of 50nm, operates at different membrane surface flow rates, the transmembrane pressure difference is 0.3MPa, and the sewage temperature is 35°C. The sewage is cross-flow filtered in the membrane equipment, and the permeate is directly used for reinjection. The circulating fluid that has not passed throug...

Embodiment 2

[0072] In this example, the effect of using this process on the treatment of fracturing flowback fluid under different membrane pore diameter conditions is investigated.

[0073] Step 1: Carry out gel breaking and flocculation sedimentation on the fracturing flowback fluid; 4 ) 2 S 2 o 8 / FeCl 2 / Na 2 CO 3 The compound formula, where (NH 4 ) 2 S 2 o 8 and FeCl 2 The concentrations are 166mg / l and 289mg / l respectively, Na 2 CO 3 The dosage depends on the pH of the incoming water; the reaction time is 40 minutes.

[0074] Step 2: Viscosity reduction treatment is performed on the effluent after gel breaking and flocculation, where O 3 The dosage is 136mg / l, and the reaction time is 20min. The properties of the treated feed liquid are as follows:

[0075]

[0076] Step 3: Membrane equipment is used to treat sewage. Ceramic membrane filters with different average pore sizes are used. The membrane surface flow rate is 4m / s, the transmembrane pressure difference is ...

Embodiment 3

[0079] In this example, the effect of using this process on treating fracturing flowback fluid under different ceramic membrane filtration pressure conditions is investigated.

[0080] Step 1: Carry out gel breaking and flocculation sedimentation on the fracturing flowback fluid; 2 S 2 o 8 / Polyferric Sulfate / Na 2 CO 3 The compound formula, where K 2 S 2 o 8 and polyferric sulfate concentrations were 200mg / l and 300mg / l, Na 2 CO 3 The dosage depends on the pH of the incoming water; the reaction time is 40 minutes.

[0081] Step 2: Viscosity reduction treatment is performed on the effluent after gel breaking and flocculation, where O 3 The dosage is 350mg / l, and the reaction time is 30min. The properties of the treated feed liquid are as follows:

[0082]

[0083] Step 3: Use membrane equipment to treat sewage, using a ceramic membrane filter with an average pore size of 50nm, with a membrane surface flow rate of 3m / s, and filter under different transmembrane pres...

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Abstract

The invention relates to a method and a device for treating oil and gas field fracturing flow-back fluid by adopting ceramic membrane, and belongs to the technical field of water treatment. The method comprises the following steps: first, conducting gel breaking flocculation treatment on the gel-containing fracturing flow-back fluid; carrying out an ozonation process to reduce the viscosity of the fracturing flow-back fluid; carrying out fine filtration according to a ceramic membrane filter technology. The method has the advantages that not only can the flux of the ceramic membrane and the operational stability be improved, but also the treating time and the technological process are shortened, and the treating cost of the fracturing flow-back fluid is reduced.

Description

technical field [0001] The invention relates to a method and a device for treating oil and gas field fracturing flowback fluid by using a ceramic membrane, and belongs to the technical field of water treatment. Background technique [0002] Fracturing is an important measure to increase oil and gas production, and it can also improve the conductivity of oil and gas layers. Therefore, it is widely used in major oil and gas fields. After the operation, a large amount of waste liquid is returned to the ground, which has become the main pollution source of water in oil and gas fields. one. [0003] The currently developed fracturing fluids include water-based, oil-based, and foam fracturing fluids. Water-based fracturing fluids are widely used in various oil and gas fields due to their low cost, low filtration loss, small damage to oil layers, and good temperature adaptability. Its market share is as high as 95%. The composition of water-based fracturing fluid is very comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/06C02F103/10
CPCC02F1/00C02F1/42C02F1/441C02F1/442C02F1/4693C02F1/5236C02F1/5281C02F1/56C02F1/78C02F9/00C02F2103/10C02F2301/08
Inventor 张春张斯凡刘飞邓唯彭文博张宏范克银
Owner JIANGSU JIUWU HITECH
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