System and method for simultaneous transport of crude-oil and naphtha in cross-country crude oil-pipeline

Abstract

The present disclosure generally relates to a system and method for the simultaneous transport of Crude Oil and Naphtha in a cross-country crude oil pipeline. The system includes the batch/zone of crude blend followed by lighter crude to clean and dissolve the asphaltene content of the crude blend. The naphtha batch/zone is sent securely in between the batch/zone of water. To carry out the cleaning of inner surface of the pipe various types of pigs have been used, the pigs have been designed to scrap the inner surface of the pipe and collect the foreign particle as well. The light crude oil is used to dissolve the asphaltene and resin components of crude blend, pigs are used to clean the surface and as well as a separating barrier in between the two layers.

1 . A system for simultaneous transport of crude oil and naphtha in cross-country crude oil pipeline, the system comprises:
 a brush-type Bi-Di (Bi-directional) pig ( 102 ) incorporated inside a cross-country crude oil pipeline followed by a blended crude oil batch configured for mechanically scraping the inner walls/circumference of the pipeline;   wherein a batch of light crude oil medium with API gravity API>36-40, particularly API>39, is transported to dissolve adhered asphaltene contaminant molecules;   a magnetic Bi-Di pig ( 104 ) incorporated inside the cross-country crude oil pipeline to scrap adhered asphaltene contaminant molecules upon maintaining close contact with a pipeline inner shell;   a batch of naphtha between batches of two water zones to prevent contamination;   a roller cup-type Bi-Di pig ( 106 ) at the front end of the batch of naphtha and water zone implemented to separate the naphtha and water;   a CDU column ( 108 ) configured to process a contaminated medium in a refinery to separate pure streams;   a plurality of crude oil tanks ( 110 ), slop tanks ( 112 ), and naphtha tanks ( 114 ) deployed at a receiving end for receiving and collecting blended crude oil, light crude oil, water, and naphtha, separated based on continuous monitoring of physical parameters and density meter readings;   a refinery desalter unit ( 116 ) to remove water medium and downstream CDU operations for stream separation upon receiving crude oil along with interface mediums of light crude oils; and   a steam cracker operation unit ( 118 ) configured for downstream production of olefins and polyolefins upon receiving transferred clean naphtha batch.   
     
     
         2 . The system of  claim 1 , wherein the cross-country crude oil pipeline is configured for transporting crude oil and naphtha upon pumping the batch of blended crude oil, the batch of light crude oil followed by a first batch of water, and the batch of naphtha followed by a second batch of water at a tail end. 
     
     
         3 . The system of  claim 1 , wherein the water zones between batches of lighter crude oil and naphtha are incorporated to prevent mixing and ensure the quality of the transported naphtha meets the feed parameters of downstream processes. 
     
     
         4 . The system of  claim 1 , wherein the brush-type Bi-Di (Bi-directional) pig ( 102 ) is deployed at a front, the active cleaning pig comprises:
 a body containing six sealing discs, with three located at the front and three at the rear of the body;   a plurality of circular brushes and a plurality of centrally located spring-loaded brushes for cleaning and debris removal within the pipeline;   a suspension wheel assembly system incorporated to maintain central alignment and reduce wear and tear on sealing discs during pigging operations; and   a plurality of provisions of bypass ports positioned at the front of the body for removal of bypassed crude onto accumulated debris.   
     
     
         5 . The system of  claim 1 , wherein the magnetic Bi-Di pig ( 104 ) is deployed at a second comprises:
 a body containing three sealing discs at both a front and rear end of the body and with brushes mounted on a centre of the body, providing 360 degrees coverage for cleaning the internal surface of the pipeline;   wherein the brushes scrubbed the internal surface of the pipeline and removed any metal particles stuck inside of the pipeline; and   a plurality of magnets deployed to remove any metal particle inside the pipeline.   
     
     
         6 . The system of  claim 1 , further comprises a BI-DI DECA Magnet pig ( 120 ) deployed at a third comprises:
 a body with a plurality of magnets on a centre part of the body, which carried the removed magnetic particles by the BI-DI DECA Brush Magnet pig.   
     
     
         7 . The system of  claim 1 , wherein the roller cup-type Bi-Di pig ( 106 ) at the head of Naphtha comprises:
 a body having a combination of sealing discs and cups which ensured proper sealing from liquid at a front.   
     
     
         8 . The system of  claim 1 , wherein an outer diameter of the magnetic Bi-Di pig ( 104 ) is 2-5% higher than the inner diameter of the pipeline for uniform scrapping of adhered asphaltene contaminant molecules thereby dissolving by a lighter crude oil medium, wherein the outer diameter is made with a special type of compressible material which gets compressed and maintains close contact with the inner shell of the pipeline. 
     
     
         9 . The system of  claim 1 , wherein the batch of naphtha considerable amount/size to be transferred is injected in between batches of two water zones, wherein at the front end of naphtha and water zone the roller Cup type Bi-Di pig is used and at a tail end of the naphtha is followed by water zone and then crude blend. 
     
     
         10 . The system of  claim 1 , wherein a first region of the interface medium between the crude blend and lighter crude oil zone, and a second region of the interface between lighter crude oil and water zone are more likely to get contaminated, which is further processed in the refinery using the CDU column ( 108 ) for the separation of pure streams for simultaneous transfer of crude oil and naphtha to the destination location. 
     
     
         11 . A method for simultaneous transport of crude-oil and naphtha in cross-country crude oil-pipeline, the method comprises:
 incorporating a brush-type Bi-Di (Bi-directional) pig ( 102 ) inside a cross-country crude oil pipeline followed by a blended crude oil batch for mechanically scraping the inner walls/circumference of the pipeline;   pumping a batch of light crude oil with specific API gravity for dissolving adhered asphaltene contaminant molecules followed by a first batch of water;   scrapping adhered asphaltene contaminant molecules upon maintaining close contact with a pipeline inner shell by deploying a magnetic Bi-Di pig ( 104 );   pumping a batch of naphtha followed by a second batch of water at a tail end to prevent contamination during transfer;   separating the naphtha and water by employing a roller cup-type Bi-Di pig ( 106 ) at the front end of the batch of naphtha and water zone;   processing contaminated medium in a refinery using a CDU column ( 108 ) for pure stream separation;   receiving blended crude oil, light crude oil, water, and naphtha at a receiving end thereby collecting in crude oil tanks ( 110 ), slop tanks ( 112 ) for the interface, and naphtha tanks ( 114 ), separated based on continuous monitoring of physical parameters and density meter readings;   sending crude oil along with interface mediums of light crude oils to a refinery desalter unit ( 116 ) for water medium removal and downstream operations; and   directing transferred clean naphtha batch to steam cracker operation for downstream production of olefins and polyolefins.   
     
     
         12 . The method of  claim 11 , wherein the blended crude oil is pumped at a flow rate of 1750 kl/hr, and light crude oil of density 810 to 840 kg/m 3  density is pumped 20,000 KL to 30,000 KL followed by followed by water batwches of 2000 KL to 4000 KL, and naptha of density 650 kg/m 3  to 750 kg/m 3  in batch sizes ranging from 35,000 KL to 55,000 KL, followed by the water of 1000 to 2000 KL at the tail end.