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HYBRID MEMBRANE ELEMENT

IP.com Disclosure Number: IPCOM000243829D
Publication Date: 2015-Oct-19
Document File: 3 page(s) / 76K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to producing water of tuned salinity using reverse osmosis RO membranes for providing salt water flooding during oil recovery from various types of strata The invention discloses a hybrid membrane element where some of the membrane sheets are replaced with a membrane of different salt rejection The replacement sheets may include both RO and nanofiltration NF membrane sheets Each spiral wound element may be constructed to yield a predetermined target salinity A catalog of spiral wound elements could be generated to meet any specific salinity requirement for EOR applications The invention includes a control system that could operate the catalog of hybrid membrane elements to obtain any required degree of salinity

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HYBRID MEMBRANE ELEMENT

BACKGROUND

The invention relates to water desalination and in particular to method and system for producing water of tuned salinity using reverse osmosis (RO) membranes for oil recovery applications. Standard spiral wound reverse osmosis membrane elements consist of up to 26 membrane sheets. These sheets are typically of the same material and manufacturing method and yield substantially identical salt rejection. A hybrid membrane design is disclosed here that would enable tuning of salinity of the water for applications such as enhanced oil recovery (EOR) from difficult strata.

BRIEF DESCRIPTION OF DRAWINGS

The invention discloses system, apparatus and method and system for producing water of tuned salinity using reverse osmosis (RO) membranes for oil recovery applications, wherein:

FIG. 1 illustrates end view of a hybrid membrane element with sheets of varying rejection characteristics to produced tailored salinity water.

FIG. 2 is schematic of a RO unit with multiple RO element trains containing hybrid membrane elements of varying rejection characteristics to produced tailored salinity water.

DETAILED DESCRIPTION

The invention discloses a hybrid membrane element, where some of the membrane sheets are replaced with a membrane of different salt rejection, as shown in FIG. 1, where sheets m1, m2 etc. may have different rejection characteristics. The replacement sheets m1, m2, etc. may include both RO and nanofiltration (NF) membrane sheets. Typically, in a 26-sheet membrane element, l between 1 and 25 of these membrane sheets could be replaced with a membrane of lower salt rejection. Each spiral wound element may be constructed to yield a predetermined target salinity. The lowest salinity would be obtained by using a complete set of membranes with highest rejection, while progressively higher salinities could be attained by replacing a greater number of sheets with RO sheets of lower rejection or NF sheets. A catalog of spiral wound elements could be generated to meet any specific salinity requirement for EOR applications. Individual element trains could be built up by stringing hybrid RO elements of similar rejection characteristics or with a range of different characteristics, as required.

FIG. 1: End...