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System and method for modification treatment and recycling of produced water in oil and gas field

A technology for produced water and oil and gas fields, applied in the field of modification, treatment and reuse of produced water in oil and gas fields, which can solve the problems of complex treatment process, waste of water resources, high treatment costs, etc., and achieve the effects of mature technology, reduced sewage discharge, and low operating costs

Pending Publication Date: 2019-10-11
HUBEI JUNJI WATER TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these treatment methods have problems such as complex treatment process, high treatment cost, and waste of water resources caused by direct discharge after treatment.

Method used

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  • System and method for modification treatment and recycling of produced water in oil and gas field
  • System and method for modification treatment and recycling of produced water in oil and gas field

Examples

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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, a system for modification, treatment and reuse of produced water in oil and gas fields is provided with a sedimentation tank 2, a pH adjustment tank 3, a primary filter tank 5, a secondary filter tank 6, a resin tank 7, Clear water adjustment tank 8, the secondary filter tank 6 is connected with the clear water adjustment tank 8; the supernatant of the sedimentation tank 2 is discharged into the pH adjustment tank 3; the effluent of the pH adjustment tank 3 is discharged into the primary filter tank in sequence 5. The secondary filter tank 6; the effluent of the secondary filter tank 6 is discharged into the resin tank 7; the effluent of the resin tank 7 and the secondary filter tank 5 are blended in a certain proportion, and the effluent is sent into the clear water regulating pool 8 to reuse.

[0030] In this embodiment, the sedimentation tank 2 is an integrated treatment equipment composed of a coagulation sedimentation tank and an incline...

Embodiment 2

[0040] Such as figure 2 As shown, a method for modifying and reusing oil and gas field produced water comprises the following steps:

[0041] Step 1: Take the produced water from the oil and gas field as the system water intake, start the primary lift pump 1, lift the produced water to the sedimentation tank 2, and precipitate the calcium, magnesium, strontium, barium and other scaling cations in the produced water, and the calcium ion in the effluent is less than 440mg / L, magnesium ion <192mg / L, strontium ion <32mg / L, barium ion <41mg / L;

[0042] Step 2: the supernatant of the sedimentation tank 2 is discharged into the pH adjustment tank 3, and the pH is adjusted to neutral by adding acid, so as to eliminate the scaling conditions of residual scale-forming cations;

[0043] Step 3: start the secondary lifting pump 4, lift the effluent from the pH adjustment tank 3 to the primary filter tank 5, and coarsely filter the sediment and suspended matter in the effluent through g...

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Abstract

The invention relates to the technical field of treatment of produced water of oil and gas fields, in particular to a system and method for modification treatment and recycling of produced water in anoil and gas field. The system for modification treatment and recycling of the produced water in the oil and gas field is provided with a sedimentation pool, a pH regulating pool, a first-stage filtering tank, a second-stage filtering tank, a resin tank and a clean water regulating pool which are all sequentially communicated with one another along the water treatment process; the second-stage filtering tank is communicated with the clean water regulating pool; a supernatant of the sedimentation pool is discharged into the pH regulating pool; outflow water of the pH regulating pool is sequentially discharged into the first-stage filtering tank and the second-stage filtering tank; outflow water of the second-stage filtering tank is discharged into the resin tank; outflow water of the resintank and the outflow water of the second-stage filtering tank are mixed in certain proportion, and the outflow water is sent to the clean water regulating pool for recycling. The system for modification treatment and recycling of the produced water in the oil and gas field has the advantages that various scaling cation removal processes are combined to treat the produced water in the oil and gas field, and the problems are effectively solved that in actual engineering, when produced water is conveyed by pipelines, the pipelines are blocked due to self-scaling, and the produced water cannot bere-injected for recycling.

Description

technical field [0001] The invention relates to the technical field of treatment of produced water in oil and gas fields, in particular to a system and method for modification, treatment and reuse of produced water in oil and gas fields. Background technique [0002] Oil and gas resources are one of the most important energy sources in the world today. The oil and gas industry uses water injection to develop oil and gas fields. With the continuous increase of oil and gas production, the production of produced water in oil and gas fields increases. The oil and gas industry will also bring adverse effects on the environment while producing oil and gas. Produced water in oil and gas fields is the product of separating water from crude oil gas containing water through processing during the exploitation of oil and gas fields, and is the largest by-product of oil and gas fields. The produced water of oil and gas fields contains a large amount of organic matter, inorganic salt io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F1/001C02F1/66C02F1/42C02F1/52C02F2103/10
Inventor 刘勇车军杰张国栋刘鲁建帅学军王周恒范敏强李勇张岚欣
Owner HUBEI JUNJI WATER TREATMENT
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