Worldwide First Run in Hole of a Dopefree 13%Cr Production Tubing String

Rignol, Joel; PARDE, Arnaud; Thoreau, Emeric; Verdillon, Lionel

doi:10.2523/95507-ms

Cited by 2 publications

(3 citation statements)

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“…The following papers have discussed the benefits and features of dope-free connections: in the Snøhvit field in Norway (Carcagno, 2007), in the Danish Sector of the North Sea (Andersen, 2007), in the Dutch Sector of the North Sea (Rignol, 2005) and also in several other oilfields (Castiñeiras, 2009) There are several other benefits that are recognized by operators such as: achievement of a zero-discharge status of chemical discharges to the environment, improved connection reliability and faster, safer casing and tubing installation, resulting in less down time with more efficient operation.…”

Section: Discussionmentioning

confidence: 99%

Formation Damage Caused by Pipe Dope and Its Remediation

et al. 2013

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Historically all well strings of casing and tubing have used thread compound or "dope" to enable good connectivity, lubricity and sealability of connections. During the makeup of a connection, excess running compound or dope is squeezed out into the annular space where it can gain access to wellbore fluids and cause formation damage. The innovation of surface technologies and industrial coatings allowed the development of dope-free connections. Dope-free technology can potentially eliminate the use of all dopes in well construction.Formation damage caused by excess pipe dope is not a recently developed problem but has been overlooked in the past. This, perhaps, is because the problem for production applies to higher formation permeability than the ones studied in this paper. For relatively low-permeability formations whose pore throats are smaller compared to dope particles and therefore the latter do not penetrate the rock matrix, the problem can be mitigated by the flow of reservoir fluids The problem can also be diminished by using solvent treatments (such as toluene or xylene) to help break down and dissolve the dope compounds.The key benefit of dope-free technology is the prevention of damage to the formation caused by dope entering the formation. Additional benefits include a more reliable and robust connection and a more efficient well site assembly process. Dope-free technology guarantees better downhole performance, minimization of galling and other connection damage as well as immediate savings in the operation by removing a routine and uncontrolled manual operation on the rig floor. Reduction of heavy tubular handling and lifting operations as well as the achievement of a virtual no discharge of effluents are also important benefits.In this paper, we present the laboratory test results utilizing actual core samples. Results show the creation of a harmful dope suspension that can penetrate and damage the formation. During injection operations this can result in severe damage to the well formation (greater than 99%), while in production operations the damage depends on the reservoir permeability. Within the tested permeability range (<288 md), it is observed that the harmful compounds did not penetrate the rock matrix and, instead, it formed a filter cake that can be removed by reservoir fluid flow while in injection mode. This paper will demonstrate the benefits of using dope-free pipe connections by quantifying the negative effects of the traditional way of joining connections with dope. Various "thread dopes" are tested, showing the differing potential damage from the dope product used. Production equations using a dope-induced skin effect are also presented, showing the detrimental impact on well performance.

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Section: Discussionmentioning

confidence: 99%

Formation Damage Caused by Pipe Dope and Its Remediation

et al. 2013

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“…There are several other benefits that are recognized by operators such as: minimization of chemical discharges to the environment, enhanced connection reliability and faster, safer casing and tubing installation. Some of the benefits of using dope-free technology are explained in the case of the Snøhvit field in Norway (Carcagno, 2007), the Danish Sector of the North Sea (Andersen, 2007), the Dutch Sector of the North Sea (Rignol, 2005) and also in several other oilfields (Castiñeiras, 2009) …”

Section: Dope-free Connectionsmentioning

confidence: 99%

“…The process is shown in Figure 1 suggesting that the secretions occur both out to the annular space, and also inside into the tubing string. A typical well in this field has an average depth of 8,200 ft and approximately 265 pipe joints, resulting in approximately 1.8 kg of excess dope inside the well.…”

Section: Introductionmentioning

confidence: 99%

The Use of "Dope-Free" Tubulars in Petroleum Well Completions

Funes¹,

Figini²,

Franceschi

et al. 2013

All Days

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Although invariably well tubulars have been connected with a thread compound to prevent corrosion and the galling of the metal itself, innovative technologies have allowed the introduction of dope-free connectivity by engineering the connections at the end of pipe sections. Avoiding the use of dope compounds has apparent benefits, one of which is the prevention of formation damage. Another is the efficiency and reliability of the operation itself, removing a cumbersome, albeit routine job, a major advantage in the hectic time of a drilling rig's operation.During the connection assembly a portion of the thread compound is exuded outside the connection and gets access to the well fluids through the tubing and annular space. Laboratory studies by us with core experiments, presented in this paper, show that the dope forms a suspension which penetrates and damages the formation. The damage is severe (more than 99 percent) and will be present in any well injection service. For production the issue is different and will depend on the reservoir permeability and the ability or lack thereof of the dope compound to penetrate the rock matrix or whether it will form a removable filter cake.The reason that this problem has not gained widespread notice is perhaps because the problem has a narrow application of formation permeability, one that we delineate in this work. Additionally, we present evidence that the dope can be washed off usually by simple flow of reservoir fluids and/or brines or it can be partially dissolved by simple solvent treatments employing toluene or xylene.We present here the clear benefits of using dope-free pipe connections by quantifying the negative effects of the alternative. Production equations using a dope-induced skin effect are presented, showing the detrimental impact on well performance.

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Worldwide First Run in Hole of a Dopefree 13%Cr Production Tubing String

Cited by 2 publications

References 0 publications

Formation Damage Caused by Pipe Dope and Its Remediation

Formation Damage Caused by Pipe Dope and Its Remediation

The Use of "Dope-Free" Tubulars in Petroleum Well Completions

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