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Horizontal well fracturing wastewater treatment and resource utilization method

A technology for fracturing wastewater and horizontal wells, which is applied in the directions of water/sewage multi-stage treatment, light water/sewage treatment, oxidized water/sewage treatment, etc. It can solve the problems of untimely fresh water supply and rough roads, and achieve high-quality wastewater The effect of recycling resources, reducing the cost of fracturing operations, and protecting the environment

Active Publication Date: 2013-02-27
陕西建科源环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the newly exploited oil fields are basically located in mountainous areas, with rugged roads and untimely fresh water supply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Water sample of 1# fracturing wastewater in a horizontal well well site.

[0020] Its resource utilization method includes the following steps:

[0021] Step 1, the mass fraction of 1mL was 30%H 2 o 2 Add it into a beaker containing 1000mL of fracturing wastewater to be treated, stir with a glass rod for 3 minutes, and let it stand for half an hour; after the pre-oxidation is complete, add 3g / L diatomite to the wastewater, and adjust the wastewater with 10% hydrochloric acid pH to 9.0;

[0022] Step 2, the polyaluminum chloride (PAC) that preparation concentration is 50g / L and the polyacrylamide (PAM) that concentration is 2g / L under room temperature;

[0023] Step 3: Use the configured polyaluminum chloride (PAC) as the flocculant and polyacrylamide (PAM) as the coagulant aid. According to the coagulation operating conditions: temperature 25±1℃, pH value adjusted to 9.00±0.05, fast Stir (200r / min) for 1min, stir slowly (20r / min) for 30min, settle for 60min, and coa...

Embodiment 2

[0032] Water sample of 2# fracturing wastewater in a horizontal well well site.

[0033] Its resource utilization method includes the following steps:

[0034] Step 1, the mass fraction of 1mL was 30%H 2 o 2 Add it into a beaker containing 1000mL of fracturing wastewater to be treated, stir with a glass rod for 3 minutes, and let it stand for half an hour; after the pre-oxidation is complete, add 3g / L diatomite to the wastewater, and adjust the wastewater with 10% hydrochloric acid pH to 9.0;

[0035] Step 2, the polyaluminum chloride (PAC) that preparation concentration is 50g / L and the polyacrylamide (PAM) that concentration is 2g / L under room temperature;

[0036] Step 3: Use the configured polyaluminum chloride (PAC) as the flocculant and polyacrylamide (PAM) as the coagulant aid. According to the coagulation operating conditions: temperature 25±1℃, pH value adjusted to 9.00±0.05, fast Stir (200r / min) for 1min, stir slowly (20r / min) for 30min, settle for 60min, and coa...

Embodiment 3

[0045] Water sample of 3# fracturing wastewater in a horizontal well well site.

[0046] Its resource utilization method includes the following steps:

[0047] Step 1, the mass fraction of 1mL was 30%H 2 o 2 Add it into a beaker containing 1000mL of fracturing wastewater to be treated, stir it with a glass rod for 1min, and let it stand for half an hour; after the pre-oxidation is complete, add 3g / L diatomaceous earth to the wastewater, and adjust the wastewater pH to 9.0;

[0048] Step 2, the polyaluminum chloride (PAC) that preparation concentration is 50g / L and the polyacrylamide (PAM) that concentration is 2g / L under room temperature;

[0049]Step 3: Use the configured polyaluminum chloride (PAC) as the flocculant and polyacrylamide (PAM) as the coagulant aid. According to the coagulation operating conditions: temperature 25±1℃, pH value adjusted to 9.00±0.05, fast Stir (200r / min) for 1min, stir slowly (20r / min) for 30min, settle for 60min, and coagulate;

[0050] Ste...

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Abstract

Provided is a horizontal well fracturing wastewater treatment and resource utilization method, comprising: using hydrogen peroxide to pre-oxidize to-be-processed fracturing wastewater, then adding kieselguhr, wherein polymeric aluminium chloride is taken as a flocculant and polyacrylamide is taken as a coagulant, coagulating the fracturing wastewater added with kieselguhr, then filtering the supernatant of wastewater after coagulation and static precipitation, performing advanced oxidation combining ozonation and photocatalytic oxidation, filtering the advanced oxidation filtered water by using multi-level microfiltration membrane, adjust the pH of the filtered water to 6.5-7.5, and finally adding a citric acid solution to get the fracturing liquid for formulation of horizontal well fracturing. The method can effectively control COD, SS and petroleum, and Fe2+, Ca2+, Mg2+ and other high-valence cations in the wastewater, therefore the wastewater can fully meet the needs of preparing the fracturing liquid. The processed water has an excellent wastewater resource reuse effect, and the method also helps to protect the environment of oil exploration areas.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to the treatment of high-concentration fracturing wastewater of horizontal wells, in particular to a treatment and resource utilization method of the fracturing wastewater of horizontal wells in oil fields. Background technique [0002] Fracturing wastewater is a kind of special wastewater from oil field operations, and its untreated discharge will seriously harm the environment of oil fields. Water-based fracturing is currently one of the main measures to increase production in oilfields at home and abroad. Horizontal well fracturing is an effective measure to efficiently exploit low-permeability reservoirs and is widely used in various oilfields. Fracking wastewater is extremely harmful to the environment. Due to the complex and stable components of its internal pollutants, it is difficult to be degraded under the action of natural forces, and pollutes the surroundin...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/78C02F1/32C02F1/72
Inventor 金鹏康贺栋任武昂金鑫
Owner 陕西建科源环境工程有限公司