Simultaneous crude oil dehydration, desalting, sweetening, and stabilization

Patent metadata

Field	Value
Publication number	US-10767121-B2
Application number	US-201916291814-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	Jan 5, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

Integrated gas oil separation plant systems and methods are disclosed. Systems and methods include treating a crude oil inlet feed stream with a high pressure production trap (HPPT), a low pressure production trap (LPPT), a low pressure degassing tank (LPDT), a first heat exchanger, a second heat exchanger, a LPPT recycle water stream, a fresh wash water supply stream, and a LPDT recycle water stream, where the LPDT recycle water stream is operable to supply recycle water from the LPDT to an output stream from the HPPT to form the LPPT inlet feed stream.

First claim

What is claimed is:

1. An integrated gas oil separation plant system, the system comprising:
a crude oil inlet feed stream, the crude oil inlet feed stream operable to convey sour and low pressure crude oil for processing in the system;
a low pressure production trap (LPPT), where the LPPT is fluidly coupled to the crude oil inlet feed stream, and where the LPPT comprises an inlet mixing device operable to thoroughly mix an LPPT inlet feed stream, a plurality of insulated electrostatic electrodes, and a weir;
a low pressure degassing tank (LPDT), where the LPDT is fluidly coupled to the LPPT, and where the LPDT comprises an inlet mixing device operable to thoroughly mix an LPDT inlet feed stream, a plurality of insulated electrostatic electrodes, and a weir, and a stripping gas stream inlet fluidly coupled with the LPDT, the stripping gas stream inlet operable to supply steam in addition to or alternative to a low concentration H 2 S stripping gas to the LPDT;
an inline gas separator, where the inline gas separator is fluidly disposed in between the crude oil inlet feed stream and the LPPT, and is fluidly disposed between the crude oil inlet feed stream and the LPPT;
a first heat exchanger, where the first heat exchanger is fluidly disposed between the inline gas separator and the LPPT and is fluidly coupled to both the inline gas separator and the LPPT, and where the first heat exchanger is operable to heat the LPPT inlet feed stream;
a second heat exchanger, where the second heat exchanger is fluidly disposed between the LPPT and the LPDT and is fluidly coupled to both the LPPT and LPDT, and where the second heat exchanger is operable to heat the LPDT inlet feed stream;
a LPDT recycle water stream, where the LPDT recycle water stream is operable to supply recycle water from the LPDT to the crude oil inlet feed stream to form the LPPT inlet feed stream;
a desalter unit fluidly disposed between the LPDT and a cold stabilizer, where the desalter unit is operable to remove salt water from crude oil;
a third heat exchanger, the third heat exchanger fluidly disposed between the LPDT and the desalter unit, where the third heat exchanger is operable to heat a crude oil output stream from the LPDT; and
a fresh wash water supply stream, where the fresh wash water supply stream is operable to supply fresh water to the output stream of the LPDT to form a desalter inlet feed stream.

2. The system according to claim 1 , further comprising a gas compression plant, where the gas compression plant comprises a low pressure compressor operable to process low pressure off-gas from the inline gas separator and LPPT, and an atmospheric pressure compressor operable to process atmospheric-pressure off-gas from the LPDT and cold stabilizer.

3. The system according to claim 2 , further comprising an oil/water separator device operable to accept an oily water output stream from the LPPT, operable to separate oil from water, and operable to recycle oil to the LPDT.

4. The system according to claim 3 , further comprising at least one mixing valve preceding the first heat exchanger, at least one mixing valve preceding the second heat exchanger, and at least one mixing valve preceding the desalter unit, where the mixing valves are operable to mix crude oil and water.

5. The system according to claim 4 , where the system is operable to refine low pressure sour crude in the crude oil inlet feed stream to produce a refined crude oil product safe for storage and shipment meeting the following specifications: (1) a salt concentration of not more than about 10 pound (lbs.) of salt/1000 barrels (PTB); (2) basic sediment and water (BSW) of not more than about 0.3 volume percent (V %); (3) H 2 S concentration of less than about 60 ppm; and (4) a maximum RVP of about 7 pounds per square inch absolute (psia) and a maximum true vapor pressure (TVP) of about 13.5 psia at 130 degrees Fahrenheit (° F.).

6. The system according to claim 4 , further comprising a second stripping gas stream fluidly coupled with the cold stabilizer, the second stripping gas stream operable to reduce the concentration of H 2 S in crude oil in the cold stabilizer, and the cold stabilizer operable to remove volatile hydrocarbons from crude oil to produce a stable, non-volatile finalized crude oil product suitable for storage and shipping.

7. The system according to claim 6 , where the cold stabilizer has about 16 actual stages.

8. The system according to claim 1 , where at least a portion of the heat provided by the first heat exchanger arises from a finished crude oil product stream.

9. The system according to claim 1 , where the operating pressure within the LPPT is greater than the operating pressure within the LPDT.

10. The system according to claim 1 , where the system is operable to dehydrate, desalt, sweeten, and stabilize crude oil to produce crude oil safe for storage and shipment without any dehydrating or desalting units other than the LPPT, the LPDT, the desalter unit, and the cold stabilizer.

Assignees

• Saudi Arabian Oil Co

Inventors

• Soliman Mohamed

Classifications

• C10G2300/30

  Physical properties of feedstocks or products · CPC title

• C10G2300/207

  Acid gases, e.g. H2S, COS, SO2, HCN · CPC title

• C10G53/02 Primary

  plural serial stages only · CPC title

• C10G33/02

  with electrical or magnetic means · CPC title

• C10G31/08

  by treating with water · CPC title