A Reeled-Tubing Downhole Jet Cleaning System

Fowler, S.H.

doi:10.2523/21676-ms

Cited by 7 publications

(2 citation statements)

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“…2,3 The limitation of the bit and scraper technique is the maximum size of the fixed diameter bit which can pass through the wellhead and any restrictions downhole. Figure 2 illustrates the varying diameters in the completion.…”

Section: Bottom Hole Assembly -Rotating Jetmentioning

confidence: 99%

The Removal of Hard Scales From Geothermal Wells: California Case Histories

McClatchie¹,

Verity²

2000

Proceedings of SPE/ICoTA Coiled Tubing Roundtable

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Geothermal Industry's largest remedial budgetary cost involves the removal of scale from its existing completions. From it's inception forty years ago, the geothermal industry has tried many different systems and applications for the removal of very hard scale from their injection and production wells. Today the most widely used and accepted method for hard scale removal has been the use of a workover rig utilizing a bit and scraper. This method, although partially effective, does not fully address the impediment of scale in the well conduit -a bit and scraper simply cannot remove what it cannot reach. In addition, with the advent of high alloy materials to combat the corrosion effects of these scales, along with pressure depleted formations, this method is proving to be inadequate as it can cause severe damage to the expensive wellbore tubulars. This paper reviews and discusses several case histories of a newly developed technique for removing these very hard geothermal scales.

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Section: Bottom Hole Assembly -Rotating Jetmentioning

confidence: 99%

The Removal of Hard Scales From Geothermal Wells: California Case Histories

McClatchie¹,

Verity²

2000

Proceedings of SPE/ICoTA Coiled Tubing Roundtable

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“…Additional advantages experienced were (1) fast trip times, (2) no interruption in circulation, and (3) relative ease of rig-up, all of which reinforce the premise that coiled tubing can provide an efficient, cost-effective alternative for cleaning downhole tubulars in conditions that historically have been restricted to mechanical removal with hydraulic workover. 1 The new scale-removal operations combine coiled tubing equipment with a versatile cleaning tool with nozzles that transform high-pressure fluid into highvelocity fluid jets that cut the buildup materials on the walls of the tubulars. The jet action can clean perforations or recesses as it can be downblast, radial or a combination of the two and can clean much larger diameters than it occupies; therefore, the tool can pass through tubing completions and clean liners or casing walls.…”

Section: Introductionmentioning

confidence: 99%

High-Strength Coiled Tubing Assists High-Pressure Well Servicing in the Gulf of Mexico

Coats

Tatarski²

1993

SPE Asia Pacific Oil and Gas Conference

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Until recently, the removal of scale from highpressure wells in the Gulf of Mexico required the use of a conventional or hydraulic workover (snubbing) rig. The conventional methods, which mechanically removed the scale, were costly and time consuming. Although removal of scale with coiled tubing provided a cost-effective alternative, coiled tubing was only considered for applications with well pressures of 5,000 psi or less. Now, however, with the advent of high-strength coiled tubing, scale-removal operations in more hostile well conditions can be performed.The case histories presented in this paper will provide an overview of the significant benefits that the operator was able to obtain from the use of high-strength coiled tubing in scale-removal operations in high-pressure wells.

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Hydraulic Workover Techniques: Their Versatility and Applications

Maddox

1994

European Production Operations Conference and Exhibition

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SPE Member Abstract The increased impetus on economic efficiency and safety in oil and gas service operations has challenged the industry to seek newer and better strategies that are able to comply with current operational needs. In response to these challenges, state-of-the-art hydraulic workover (HWO) equipment and systems, which can provide alternative methods to traditional drilling and workover operations and can comply with economic and safety constraints, have now been developed. These new systems not only enhance problem-solving options but also increase protection of service personnel and the environment. This paper will discuss the broader range of applications that has emerged as a result of improvements in HWO technology, the history of these systems, new HWO capabilities, components of the new systems, and safety enhancements recently introduced to the industry. Case histories will provide supporting data. Introduction and History While performing drilling or workover operations, operators have routinely encountered situations that exceed the capabilities of conventional derrick-based equipment. The development of new HWO well servicing techniques can now address these needs. New, more compact equipment can perform not only routine drilling and workover rig functions but also operations under pressure that are beyond the scope of derrick-based equipment. In many situations, hydraulic workover procedures involve moving pipe under pressure rather than when the well is "dead." To force, or "snub," a pipe into a pressurized well bore, a seal must first be established on the internal diameter of the pipe to prevent the hydrocarbons from blowing up through the pipe during the operation. Often, this internal seal consists of a check valve (or a pair of check valves) to be placed as part of the bottomhole assembly (Figure 1). These check valves allow fluids to be pumped down the string of pipe but check any flow in the upward direction. At other times, such as when installing a velocity string (also called a siphon string), the internal seal is provided by a wireline removable plug or other subsurface flow control device (Figure 2). A second requirement in snubbing operations is that a seal be established between the wellbore and the outside diameter of the pipe that is being forced into the wellbore. This seal prevents hydrocarbons from blowing up through the annular space. The seal is provided by a normal oilfield blowout preventer (BOP) with modified sealing surface materials (Figure 3). P. 115^

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A Reeled-Tubing Downhole Jet Cleaning System

Cited by 7 publications

References 0 publications

The Removal of Hard Scales From Geothermal Wells: California Case Histories

The Removal of Hard Scales From Geothermal Wells: California Case Histories

High-Strength Coiled Tubing Assists High-Pressure Well Servicing in the Gulf of Mexico

Hydraulic Workover Techniques: Their Versatility and Applications

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