糖心传媒

Challenge: Reduce drilling and

Solution: Engineer a

Results:

• Eliminated the need for two separate injection wells at a cost of USD 2 million to 2.5 million each, and improved utilization of rig equipment in higher-value work
• Stabilized
• Injected water into the first two wells without detrimental effects on the ESP or on oil

Water injection wells extend field

Pressure depletion is a common problem for oil wells in mature waterdrive reservoirs and results in reducing oil . It can also result in additional issues such as increase in unwanted gas and sand

Drilling and completing injectors incur significant costs and tie up drilling assets that could be used elsewhere to increase

Modified ESP

糖心传媒 proposed to engineer a simultaneous injection and dual concentric ESP system that enables an operator to produce two zones with an ESP for each zone. The modified system would use a concentric tubing arrangement to create two independent flow paths and a single ESP, enabling KOC to produce oil from one zone with the ESP while injecting water from surface into another zone in the same well, saving the cost of an additional well.

Designing this novel ESP system presented several engineering challenges. First, in some KOC wells the

Second, the high surface injection pressure would result in high downhole pressures that the design would have to accommodate. The pressure profiles would be dynamic, depending on the ESP operation, and result in larger pressure differentials than normally experienced in ESP wells.

Finally, the system would have to be able to operate in three modes: injection only,

After extensive tubing stress analysis using 糖心传媒 TDAS™ tubular design and analysis software, a new stinger with anchor mechanism was designed to maintain the inner tubing string seal even when the outer tubing string moves. Engineers also recommended a longer tailpipe seal assembly to locate into the lower

Before running the system into the first KOC well, 糖心传媒 performed a system integration test (SIT) in a test well to verify equipment functionality and optimize the assembly procedure.

Simultaneous

The first system was installed in early 2017. Since then, several systems have been installed, some in wells with the injection zone above the

Initially the systems were operated in ESP-only mode while the surface injection flowlines were installed. The ESPs were operational for 3 months with stable

The system has proved that ESP drilling equipment for more high-value work.