System and method for separating and recovering gas field chemicals from wastewater
AssigneeSaudi Arabian Oil Company
InventorMohamed A. Soliman
Life of this patent
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Abstract
Described is a method for concentration and extraction of gas field chemicals. The method includes collecting produced water from a gas oil separation plant, treating the produced water to remove oil, and receiving a feed solution containing a gas field chemical and water. The treated produced water is used as a draw solution to concentrate and absorb water from the feed solution using a forward osmosis chamber. A concentrated feed solution containing the gas field chemical and a diluted draw solution is produced. The concentrated feed solution is extracted and stored for injection into gas wells.
Claims17
A method for separating gas field chemicals from a feed stream, comprising:
- providing a forward osmosis chamber comprising a forward osmosis membrane;
- feeding a draw stream of high salinity produced water to the forward osmosis chamber;
- feeding the feed stream to the forward osmosis chamber, wherein the feed stream comprises condensed water vapor from a gas well containing kinetic hydrate inhibitor (KHI);
- osmotically separating pure water from the feed stream and obtaining a concentrated feed stream of KHI from the forward osmosis chamber;
- and
- obtaining a diluted draw stream of produced water from the forward osmosis chamber.
A method for concentration and extraction of gas field chemicals, comprising:
- collecting produced water from a gas oil separation plant;
- treating the produced water in a water oil separation plant to remove oil;
- receiving a feed solution passed through a three-phase separator and a filter, the feed solution comprising a gas field chemical and water;
- using the treated produced water as a draw solution, concentrating and absorbing water from the feed solution using a forward osmosis chamber, thereby producing a concentrated feed solution containing the gas field chemical and a diluted draw solution;
- extracting the concentrated feed solution containing the gas field chemical;
- shipping the concentrated feed solution containing the gas field chemical offshore;
- storing the concentrated feed solution containing the gas field chemical in a storage unit;
- mixing the concentrated feed solution containing the gas field chemical with one or more additional chemicals;
- and
- injecting the mixture into a gas well.
A system for concentration and extraction of gas field chemicals, comprising:
- a gas oil separation plant configured for producing water from a crude feed;
- a water oil separation plant configured for removing oil from the produced water;
- a three-phase separator and a filter for configured for producing a feed solution comprising a gas field chemical and water;
- a forward osmosis chamber configured for concentrating and absorbing water from the feed solution using the treated produced water as a draw solution, thereby producing a concentrated feed solution containing the gas field chemical;
- a chemical storage unit for storing the concentrated feed solution containing the gas field chemical;
- and
- at least one model predictive controller operable for adjusting a plurality of operating parameters to maximize recovery of the gas field chemical.
Dependencies are inferred from the claim text.