Produce through coiled tubing to keep marginal wells unloaded

Journal Article · Mon Dec 01 00:00:00 EST 1986 · World Oil; (United States)

OSTI ID:7053203

The use of coiled tubing as an alternate production tubing string has been attempted or considered by numerous operators in the past. However, its use has been tempered due to several problems known to be inherent with coiled tubing recompletions. Some of the problems encountered are: Killing the well to allow for tubing installation always carries the risk of formation damage; Candidate wells normally are marginal producers and may not produce sufficient revenue to justify the cost of a major workover; Procedures followed to install surface equipment may be hazardous; Previous installation designs required running the coiled tubing to the top of the tree, affecting the functional loss of all existing wellhead equipment; Often substandard modifications were required to reconnect into existing production facilities. However, a prototype spool and tubing hanger that incorporated modifications designed to solve these problems has been developed jointly by Reeled Tubing, Inc., and Well-head Control Systems. The solution is a new concept in the coiled tubing hanger. The design incorporates a floating element, which is a combination slip bowl, seal element and retaining sub. The entire assembly is installed and activated in the bore of a specially designed spool installed between the primary and secondary master valves of the existing wellhead.

• OSTI ID: 7053203
• Journal Information: World Oil; (United States), Vol. 203:6
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
DRILL PIPES
DESIGN
INSTALLATION
OIL WELLS
COST
FASTENERS
FORMATION DAMAGE
MODIFICATIONS
OCCUPATIONAL SAFETY
OIL YIELDS
PRESSURE EFFECTS
PRODUCTION
RESERVOIR ENGINEERING
SEALS
SPECIFICATIONS
THREADED JOINTS
VALVES
WELLHEADS
CONTROL EQUIPMENT
DRILLING EQUIPMENT
ENGINEERING
EQUIPMENT
FLOW REGULATORS
JOINTS
PIPES
SAFETY
WELLS
YIELDS
020300* - Petroleum- Drilling & Production
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)