1 May API RP 5C1 (R). Recommended Practice for Care and Use of Casing and Tubing. standard by American Petroleum Institute, 05/01/ 24 Sep API RP 5C – Care and Use of Casing and Tubing_自然科学_专业资料。 Recommended Practice for Care and Use of Casing and Tubing. 29 Jun API tubing is inspected at the mill in accordance with API Spec. 5CT. . Torque values listed in API RP 5C1 apply to tubing with zinc-plated or.
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It may be preferable in some flowing wells to depend upon inhibitors to protect the inside of the casing and the tubing. In general, all new areas should be considered as being potentially corrosive and investigations should be initiated early in the life of a field, and repeated periodically, to detect and localize corrosion before it has done destructive damage.
Environmentally non-damaging thread compounds meeting API thread-compound performance requirements are available. When H2S is present in the well fluids, casing of high yield strength may be subject to sulfide corrosion cracking. Tubing should be handled at all times on racks or on wooden or metal surfaces free of rocks, sand, or dirt other than normal drilling mud.
API RP 5C1 Recommended Practice for Care and Use of Casing and Tubing
Some users have found that, for a limited number of critical well applications, these procedures do not result in tubing suffi- ciently free of defects to meet their needs for such critical applications. This article provides an overview of apo and handling considerations for tubing. Use of aip tongs is necessary to obtain consistent makeup torque. Inspection of tubing when received and following use are important to ensure that defects or wear do not prevent the tubing from performing as designed.
Physical properties are checked and each length hydrostatically tested, normally to only 3, psi in the plain end unthreaded condition.
Several thread protectors may be cleaned and used repeatedly for this operation.
zpi Typical defects are outside and inside pits and longitudinal cuts, transverse laps, and mechanical wear and erosion. There is no standard method for calculating performance properties of used tubing. The following are also checked:. Loose couplings should be removed, the thread thoroughly cleaned, fresh compound applied. Follow the API recommended tubing makeup torque for nonupset, external-upset, and integral-joint tubing. Class IV connections are intended for the most severe application, and Class I connections are intended for the least severe application.
These investigations should cover: Coupons may also be helpful in determining whether suffi- cient inhibitor is being used.
Tubing inspection and handling –
Immediately before running, remove protectors from both field end and coupling end and clean threads 51, repeating as additional rows become uncovered. No further reproduction is perm itted. Properly maintained, installed, and calibrated tongs are essential. Apply a good thread compound but avoid excessive amounts.
For specialty connections, consult with the manufacturer on the proper thread compound. Thread protectors must be installed properly and rough handling avoided.
Where conditions favorable to corrosion exist, a qualified corrosion engineer should be con- sulted. Those found damaged, even slightly, should be laid aside unless satisfactory means are available for correcting thread damage. Check each coupling for makeup. In general, the high-strength materials are more susceptible to handling damage.
If needed, adjust torque and repeat. International standards 5c11 tubing. There should be no excessive heat, approximately two turns beyond the hand-tight position with all threads buried.
Due to the permissible tolerance on the outside diameter immediately behind the tubing upset, the user is cau- tioned that difficulties may occur when wrap-around seal-type hangers are installed on tubing manufactured on the high side of the tolerance; therefore, it is recommended that the user select the joint of tubing to be installed at the top of the string.
The concentration of H2S 5d1 to cause cracking in dif- ferent strength materials is not yet well defined. Ordinarily, pumping wells should be tubed as close to bot- tom a;i practical, regardless of the position of the pump, to minimize the damage to the casing from corrosive fluids.
Tubing inspection and handling
The operating personnel should ensure that good practices are followed. Every possible effort should be made to keep such damage at a minimum by using proper up-to- date equipment. In view of this practice, it is suggested that the individual user: Use the established makeup torque for the remainder of the string.
Care must be taken in unloading and storage. Proper handling, both in transit and on site, are critical to avoiding damage to the tubing. An analysis of the pro- duced gas for carbon dioxide and hydrogen sulfide is also desirable; 2 corrosion rate tests by using coupons of the same materials as in the well; and 3 the use of caliper or optical-instrument inspections.
In flowing wells, packing the annulus with fresh water or low-salinity alkaline muds.