SC-HydroPull™ Offshore Asphaltene Cleanout
The customer had shut in a high-asphaltenic, offshore gas well in early 2010 and wished to clean the well in preparation for temporary abandonment in 2015. The water depth was 3853-ft and the gas sand was located at 18,225 to 18,338-ft MD. The production tubing was:
4.5-in (3.826-in ID) to 17,412
3.5-in (2.992-in ID) to 18,031
a 60 ft inverted telescopic joint with a minimum ID profile of 2.75″
3.5-in sand screen across the reservoir, 18,225-18,338-ft
A plan to clean the completion with 29,000 ft of 1-1/2″ coiled tubing deployed on the Helix Q4000 was prepared. A 2.12-in SC-HydroPull™ equipped with a carbide-tipped bullhead and 6×0.106-in diameter forward facing cleaning jets was specified. The HydroPull® job planning software showed that a pumping 1.25 bpm of xylene would generate 850 psid pulsed jets and 327 psid water hammer suction pulses in the annulus and would require pumping pressure at 10,491 psi with 4200 psi wellhead pressure.
An OSES toolhand arrived at the rig with the SC-HydroPull™ tools via helicopter. A slick line run tagged bottom at 17557-ft, 668 ft above the top of the sand. Xylene was pumped at 1 bpm/ 9200 psi at 17400-ft and the fill was tagged at 17597-ft. Pumping continued for an hour with slow progress, the pumps were stopped for an hour to allow the xylene to soak. Pumping resumed for an hour at 1 bpm and another for another hour at 1.25 bpm/10,200 psi until 18,250-ft, which was 25-ft below the top of the completion screen. The WHP was 4200 psi, but climbed to 4750 psi as the tools entered the screens. The customer then confirmed the ability to bullhead fluid into the completion in preparation for cement placement. Total pumping time was 3 hours with 3.25 bbl of xylene placed. This job illustrates the ability to clean heavy asphaltene that was obstructing access to a small diameter completion. The job was completed quickly despite high well pressure and the small diameter of coiled tubing available for offshore well intervention.
Demonstrated Hydropull Effectiveness
Case History, McMullen County, TX
Casing 5 ½” 23 lb
2” Coil Tubing
23 8K plugs plus 1 Kill Plug
We received this report from the field, once again demonstrating the effectiveness of the HydroPull, saving time and money to our customers. “Our competition was on the well and was unable to reach bottom leaving 4 plugs in the well. They were pumping 2 gl per 10 bbl on ultra-lube and a beca-lube slug ever 50 bbl and still had lock up. OSES was asked to take over and to rig up with the HydroPull. Our running weight at 13,880’ was 3k to 4k moving at 20 fpm with no lube used at this point. A slug was sent at 14,230’; the first plug was tagged at 14,478’ and drilled without any stalls and a running weight of 3k to 4k at 15 fpm. The remaining 3 plugs were drilled at 14,722’ 14,491’, and 15,212’ with only 1 stall. We tagged PBDT at 15,473’ with 4K running weight at 8 fpm. The average wash time between plugs was 33 minutes, and average drill times were 5 min. We rigged up on the 2nd well on the pad and drilled all plug with less chemicals being used compared competition’s 1st run on the previous well. We finished the well with positive running weight and reaching PBDT.
Milling plugs left in the well by the competition
Casing 5 ½” 23 lb.
PBTD – 15,621′
2” CT Unit
29 8K plugs
Our competition was on the well and unable to reach bottom with their downhole coil agitation tool. They had friction lock up at 14,315’ while pumping 10bbl ultra-lube slugs (2.5 gal per bbl.) every 50 bbl and running 1½ gal per 10 bbl during the operation. 5 plugs were left in the bottom 1000′ of the well. OSES was asked to rig up with the Tempress® HydroPull™. Read More »
This article provides an overview of OSES Tempress extended reach and phase separation tools.
Hammer Time July 2013
New record extended reach fill cleanout with coiled tubing – 10,600 foot horizontal
Two shallow, extended reach wells on the North Slope of Alaska required fill cleanouts. The TVD of the first well was 3800 feet with a measured depth of 14,400 feet for a total horizontal extent of 10,600 feet. The horizontal extent of the second well was 10,466 feet. Both wells were completed with 4-1/2-inch casing.
Prior attempts to reach total depth to clean fill out of these wells with 2-inch diameter coil and a tractor device were unsuccessful.
Both jobs were completed using a 2-1/8-inch HydroPull® tool run on 2-inch coil with a flow rate of 2.2 bpm. The HydroPull®
job planning software indicated lockup without the tool at 10,000 ft MD. The average annular flow velocity was 190 fpm, which is marginal for cuttings transport in a shallow inclined well, however the pulsed annular flow provided by the tool ensured adequate cuttings transport and both jobs were completed without incident. Total job time was 1 day for the first well and 2 days for the second well.