Enerscope Systems Inc.
 

Secondary Recovery

Secondary RecoveryBag Filters Eliminated for Waterflood Injection Wells

System Identification: 
Waterflood injection

Solids/liquids: 
Sand, silt and hydrocarbons/produced water

Problem: 
A bag filter system used to filter produced water at a major oil production company’s site had to be changed as often as every hour, demanding extensive time of maintenance and plant operations personnel at a site originally designed to be unmanned. The bag filters were being used to protect the oil-water separating hydrocyclone.

Solution: 
Searching for a lower-maintenance, more efficient filtration solution, the operations staff at the production company first installed the Enerscope Desander prior to the bag filters, intending to extend bag life and improve operating efficiency. After only one year in operation, the desander was found to be so efficient in removing sand from the produced water that the bag filter system could be completely eliminated. In addition to eliminating the costly bag system, the desander protects the hydrocyclone from extensive wear, extending its operational life and increasing performance. Due to the high velocities required in the hydrocyclone, sand in the system produces considerable wear. In the system, produced water is fed first through the Enerscope Desander, then to the oil-water hydrocyclone. Sand is removed from the produced water, keeping it out of the injection well system and protecting the hydrocyclone. The results have been dramatic. In operation for more than four years, the desander reduced system maintenance significantly, freeing staff time for other operational tasks. Installation cost savings were remarkable, with the initial cost of the Enerscope Desander less than 15 percent of the cost of the bag filtration system. A second system has been installed at a neighboring location. The operator had stringent pressure requirements for this filtration system. The Enerscope Desander incorporated at this site was able to meet the 600 psi requirements, as well as handle the corrosive nature of the fluid. Chief Operator, Brad Smith, has been exceptionally pleased with the operational improvements achieved with the Enerscope Desander. Bag filters have been eliminated, along with their extensive maintenance. The Enerscope Desander was easily installed, and has low operating costs.

Waterflood Injection Wells Maintain Efficiency with Enerscope Desander

Waterflood Injection Wells Maintain Efficiency with Enerscope DesandersKeeping sand out of their injection well systems, Shell Oil Company in Denver City, Texas (now owned by Oxy) relies on over 50 Enerscope Desanders to help reduce repairs and replacements of expensive pumping systems and preserve the necessary porosity and permeability of their underground formations.  Since the first installations, these desanders have been significantly effective in helping curb soaring labor and maintenance costs.

Well water is pumped directly to the Enerscope Desanders from turbine pumps at approximately 17,000 bbld.  The desanders remove the sand, discharging the water down line to an injection pump station.  At each station, high performance injection pumps convert line pressure from 100 to 2,000 psi for injection into the ground.  This forced water sweeps the oil deposits toward producing wells for recovery.

Spokesmen for Shell Oil indicate the Enerscope Desanders protect their systems at several points:

1. Sand settlement in the pipelines is greatly reduced and good flow characteristics are maintained.
2. System performance is no longer inhibited by sand.
3. The ultra filtration equipment is protected from plugging and excessive wear.
4.The injection pumps are protected from abrasive wear and expensive repairs and replacements.(Before the Enerscope Desanders were installed, these pumps sometimes required repairs as often as every two weeks because of sand wear.)
5. The limestone formations below the surface are kept free of sand which otherwise would have clogged the area around the injection wells and severely hampered the injection technique.

The automatic purging systems are installed on the Enerscope Desanders to regularly flush the desander of collected sand and all units are coated with Scotchkote to withstand the years of 24-hours-a-day operation in the presence of H2S. According to spokesmen for Shell Oil, “We expect to eventually install Enerscope Desanders on all our fresh water wells in this project. They cured our major sand problems, maintenance now is comparatively nil, and the cost savings are appreciable”

 

Desanders Protect Pumps And Curb Maintenance Costs for Saltwater Disposal Wells

No longer the victim of excessive and expensive high-pressure pump repair costs, Marshall Exploration of Logansport, Louisiana, installed several Enerscope Desanders to eliminate sand from saltwater and reports huge monthly savings. The saltwater remnant from their oil drilling and refining operations, is disposed of by means of high-pressure injection into the ground. Gravity-fed from huge holding tanks, this brackish water passes first through a Y-strainer and then directly through the Enerscope Desanders for removal of sand and abrasive grit before reaching the system’s high pressure pumps for deep well injection.

Says Philip Blue, Area Supervisor for Marshall Exploration, “Without the desanders, we were spending a lot every month to repair or replace the pumps’ plungers, ceramic heads and seals. Valve damage was also a big problem. Now, we can keep operating efficiently for more than five months without such problems. That’s a big savings for us.”

Blue also points out that shutting down for pump & system maintenance is also costly. “When we have to shut down for repairs, it takes two men over 2-1/2 hours to get our system going again,” says Blue. “Now, with the desanders, we are not forced to shut down.”

By eliminating these troublesome solids, Marshall Exploration also enjoys maximum injection characteristics with less chance of plugging the underground formations.

“We’re very pleased with the benefits and value of our Enerscope Desanders,” says Blue. “It saves us a lot of money.

 

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