Complete Application of RO Reverse Osmosis Membranes in the Oil and Gas Industry

RO relies on the solution-diffusion mechanism to retain dissolved salts, colloids, and small organic molecules, achieving a desalination rate of over 99%. It is a core technology for water resource reuse, high-purity water preparation, wastewater reduction, and offshore platform water supply in oil and gas fields. However, oil and gas water contains oil, high salt, and high hardness, so RO cannot directly treat the original produced water and must be accompanied by a complete pretreatment system.

I. Six Core Application Scenarios:

1. Deep Treatment and Reinjection of Oilfield Produced Water:

1) Low-Saltification Oil Flooding Reinjection Water: High-salinity produced water, after pretreatment by air flotation and ultrafiltration, enters an 

anti-fouling RO membrane for desalination to TDS < 1000 mg/L. This is used for polymer flooding and surfactant flooding, improving rock 

wettability, enhancing oil recovery, and preventing formation scaling and clogging.

2) Standard Reinjection Water: The RO membrane removes calcium and magnesium ions, silicon, and sulfates, reducing corrosion and scaling risks, producing qualified formation 

reclaimed water, and reducing groundwater extraction.

3) Near-Zero Discharge ZLD Front-End Volume Reduction: The RO membrane concentrates high-salinity wastewater, and the concentrate is then 

connected to evaporation/crystallization equipment, significantly reducing evaporation scale and energy consumption.

Typical Process: 

Air Flotation Oil Removal → Coagulation Sedimentation → Multi-Media Filtration → Ultrafiltration (UF) → Anti-fouling RO Membrane

2. Heavy Oil Thermal Recovery Boiler/Steam Injection Boiler Feedwater Preparation: 

Heavy oil extraction via SAGD and steam injection requires boilers with extremely high water quality requirements (low hardness, low silica, low total 

dissolved solids).

Process Route: 

Raw water/reclaimed produced water → Pretreatment → RO (primary/secondary) → EDI/mixed bed → Ultrapure water supplied to the steam 

generator to prevent scaling and pipe rupture in the boiler and pipelines, and to improve steam dryness and thermal efficiency.

3. Seawater Desalination Supply for Offshore Platforms/Coastal Oil and Gas Terminals:

Offshore drilling platforms, FPSOs, and coastal terminals lack freshwater recharge and utilize seawater-grade SW-RO membranes for seawater 

desalination:

- Produces drinking water, equipment cooling water, and process pure water;

- Equipped with energy recovery devices to reduce high-pressure energy consumption;

- Utilizes fouling-resistant seawater membranes to resist marine colloid and microbial contamination.

4. Preparation of Industrial Pure Water and Circulating Cooling Water for Plants:

Oil and gas processing plants, refining terminals:

1) Preparation of circulating cooling water makeup water to reduce scaling and corrosion and minimize sewage discharge;

2) Low-ion clean water for instruments, compressors, and cooling systems;

3) Supply of clean water for camp life.

5. Treatment and Reuse of Gas Field Produced Water and Fracturing Flowback Fluid:

Shale gas/tight gas fracturing operations generate large amounts of high-salt flowback wastewater:

- Reuse the purified water after RO desalination for fluid preparation, achieving a cycle of fracturing water resources;

- Reduce the volume of concentrate for disposal, lowering transportation costs and environmental risks;

- Employ a pollution-resistant DTRO disc tube type RO system to cope with high-pollution and high-pressure operating conditions.

6. High-purity water for refining and natural gas purification units: 

High-quality process water is required for natural gas deacidification, ethylene glycol regeneration, and amine regeneration systems; ultrapure water 

is produced by two-stage RO+EDI to ensure the long-term stable operation of the purification units.

II. RO Membrane Selection for the Oil and Gas Industry:

* FR (Fouling-resistant) Brackish Water RO Membrane: Suitable for pre-treated produced water and brackish water.

* SW (Seawater Reverse Osmosis) Membrane: Suitable for seawater and extremely high-salinity produced water.

* DTRO (Disc Tube Reverse Osmosis): Suitable for fracturing fluid and highly polluted concentrate.

* High-Temperature Resistant RO Membrane: Suitable for high-temperature oilfield produced water.

III. Technical Challenges and Countermeasures in Oil and Gas Operations:

1. Oil and Organic Pollution: Direct contact between RO and crude oil is strictly prohibited; pretreatment must control the oil content below 0.1 

mg/L and SDI < 3.

2. Inorganic Salt Scaling (Ca, Ba, Sr, SiO₂): Add scale inhibitors, use nanofiltration (NF) for softening, and implement segmented design to reduce 

recovery rates.

3. Biofilm Growth: Use UV sterilization, online chemical cleaning, and regular CIP maintenance.

4. High Osmotic Pressure and High Energy Consumption: Configure energy recovery devices in seawater systems; employ a "RO + evaporation" 

coupled process for high-salinity concentrates to balance investment and energy consumption.

IV. Typical Complete Process Flow (Oilfield Produced Water Reuse):

Produced water → Air flotation for oil removal → Coagulation and sedimentation → Multi-media filtration → Activated carbon filtration → 

Ultrafiltration (UF) → Security filter → Primary anti-fouling RO → Product water reuse (reinjection/boiler feedwater); RO concentrate → 

Deep concentration or evaporation crystallization to achieve zero discharge.

V. Value Summary:

1. Environmental Value: Reduces wastewater discharge, meeting environmental management requirements of oil and gas fields;

2. Cost Value: Water resource recycling reduces the cost of purchasing, transporting, and disposing of water;

3. Development Value: Low-mineralization water drive enhances crude oil recovery;

4. Equipment Protection: Low-hardness pure water protects boilers, heat exchangers, and gathering pipelines, reducing corrosion, scaling, and 

downtime for maintenance.

VI. Common Models:

BW30‑4040

BW30‑PRO‑4040

BW30‑365

BW30‑400

BW30‑400/34

BW30‑PRO‑400/34

BW30‑XHR‑PRO‑400/34

BW30‑HR‑440i

BW30‑FR‑4040

BW30‑XFR‑400/34i

BW30‑HRLE‑440

XLE‑2521

XLE‑4040

LE‑4040

LC‑LE‑4040

ECO PRO‑400

ECO PLATINUM‑440

XLE‑440

TW30‑2026

TW30‑2514

TW30‑2521

TW30‑4014

TW30‑4021

TW30‑4040

SW30‑2540

SW30‑4040

SW30HR‑380

SW30HR‑LE‑400

SW30‑2540

SW30‑4040

SW30HR‑380

SW30HR‑LE‑400

TML10‑4040

TML20‑370

TML20‑400

TML20D‑400

TM720‑400

TM720‑440

TM720D‑400

TM810‑4040

TM810V‑4040

TM820M‑400

TM820M‑440

TM820V‑400

TM820V‑440

TM820K‑400

ESPA1‑4040

ESPA1‑LD‑4040

ESPA2‑4040

ESPA2‑MAX

ESPA2‑LD‑MAX

ESPA4‑4040

ESPA4‑LD‑4040

ESPA1

ESPA2‑LD

ESPA4‑MAX

CPA2‑4040

CPA3‑4040

CPA5‑MAX‑4040

CPA5‑LD‑4040

CPA3

CPA5‑LD

CPA6‑MAX

LFC1‑LD

LFC3‑LD

PRO‑LF1‑4040

PRO‑LF1

PRO‑XR1

SWC4‑4040

SWC5‑4040

SWC5‑LD

SanRO‑HS‑4040 / SanRO‑HS‑8040

BW2521‑UES

BW4021‑UES

BW4040‑UES

BW2521‑ES

BW4021‑ES

BW4040‑ES

BW400‑ES‑G2

BW440‑ES‑G2

BW2521‑R

BW4021‑R

BW4040‑R

BW400‑R‑G2

BW440‑R‑G2

BW400‑AFR‑G2

SW400‑SR‑G2

SW400‑GR‑G2

XLP‑2521

XLP‑2540

XLP‑4021

XLP‑4040

XULP‑8040

XULP‑8040‑440

ULP‑4040

ULPH‑4040

ULP31‑4040

ULPD‑4040

ULP‑8040

ULP22‑8040

BW‑4040

BW‑8040

BW‑8440

BW‑8040FR

BW‑8440FR

RM‑SW1‑4040

RM‑SW‑8040

SFP-2660

SFD-2660

SFP-2860

SFD-2860

SFP-2880

SFD-2880

SFP-2860XP

SFP-2880XP

IP-55

IP-77

MB‑P2514‑0.5

MB‑P2521‑1.0

MB‑P4021‑2.5

MB‑P4040‑6.0

dizzer XL series

MB‑0.9‑XL‑80i‑TR

HYDRACap MAX‑40

HYDRACap MAX‑60

HYDRACap MAX‑80

HYDRACap 4040

HYDRAcap‑LD series

HFU‑1010

HFU‑1020N

HFU‑2020N

HFUG‑2020AN

UNA‑600A

UNA‑620A

UNA‑620AB

UNA‑820A

Aquaflex‑55

Aquaflex‑64

XIGA‑40

SXL‑225FSFC

Compact‑27

Compact‑33V

Compact‑55G

XF53

XF64

ZeeWeed‑1000

ZW‑500D

ZW‑1500

ZW‑500C

ZW‑700B

ZW‑10

8040‑M183‑LPP / LPHN

KS‑MP8860

KS‑MP1080

KS‑V8048‑35‑PMC

ZK‑385

ZK‑386

VUF‑2860

VUF‑2880

VUF‑2860T

VUF‑2880T

VUF‑i1066

VUF8040‑4K、6K、8K、10K、20K、67K

OWUF‑6 / OWUF‑8 / OWUF‑9

TM‑U‑2860

TM‑U‑2880

LH3‑1060

LH3‑0850

LJ1E‑1100‑V160 / 1500‑V160 / 2000‑V160

UF2860

UF2880

HM90、HM160、HM200

UF‑8040 PVDF/PAN

EM‑UF‑8060‑PVDF

EM‑UF‑8080‑PVDF

EM‑UF‑1060‑PVDF