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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Follow the API recommended tubing makeup torque for nonupset, external-upset, and integral-joint tubing.

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. The compound is a mixture of metallic and graphite powders uniformly dispersed in a grease base.

Enviado por Wagner flag Denunciar. Where conditions favorable to corrosion exist, a qualified corrosion engineer should be con- sulted. To determine the value and effectiveness of the appi practices and measures, cost and equipment-failure records can be compared before and after application of control mea- sures.

The use of pipe wrenches is not recommended. Check each coupling for makeup. Thread protectors must be installed properly and rough handling avoided. Tubing should be stacked on racks following proper procedures, and tubing in storage should be inspected periodically and protected from corrosion. The total of the individual lengths so measured will aapi the unloaded length of the tubing string.

Ordinarily, pumping wells 5v1 be tubed as close to bot- tom as practical, regardless of the position of the pump, to minimize the damage to the casing from corrosive fluids. Check spider slips to ensure they will not damage the tubing body.

Properly maintained, installed, and calibrated tongs are essential.

The following are also checked:. Tong dies should fit properly and conform to the curvature of the tubing. If the stand-off is abnor- mally great, check the coupling for tightness.

Loose couplings should be removed, the thread thoroughly cleaned, fresh compound applied. In flowing wells, packing the annulus with fresh water or low-salinity alkaline muds. Proper handling, both in transit and on site, are critical to avoiding damage to the tubing. These investigations should cover: There should be no excessive heat, approximately two turns beyond the hand-tight position with all threads buried. Place clean protectors on field end of the pipe so that thread will not be damaged while rolling pipe onto the rack and pulling into the derrick.


Download API RP 5C1 – pdf

Class IV connections are intended for the most severe application, and Class I connections are intended for the least severe application. Despite all the American Petroleum Institute API specifications and testing, some tubing defects are still found after delivery; thus, some operators do further inspection of new tubing on critical wells.

The concentration of H2S necessary to cause cracking in dif- ferent strength materials is not yet well defined. When lengths of tubing are inadvertently dragged in the dirt, the threads should be recleaned and ser- viced again as outlined in 5. In pumping wells, avoiding the use of casing pumps. No further reproduction is perm itted. Various nondestructive inspection services have been employed by users to ensure that the desired quality of tubing is being run. Collar-type tubing elevators are adequate for API nonbeveled couplings; however, slip-type elevators are recommended when running tubing with beveled couplings, special clearance couplings, and integral joint tubing.

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. Adequate thread cleaning is essential for proper connection makeup and pressure-tight strings. If needed, adjust torque and repeat. Use the established makeup torque for the remainder of the string.

It may be preferable in some flowing wells to depend upon inhibitors to protect the inside of the casing and the tubing.

Tubing inspection and handling

Care must be taken in unloading and storage. A steel tape calibrated in decimal feet millimeters to the nearest 0. Inhibitor effectiveness may be checked also by means of caliper surveys, visual examinations of readily accessible pieces of equipment, and water analyses for iron content.

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 length of each piece of tubing shall be measured prior to running. Slips should be examined before using to see that they are working together. Use of power tongs is necessary to obtain consistent makeup torque.

Immediately before running, remove protectors from both field end and coupling end and clean threads thoroughly, repeating as additional rows become uncovered.

Literature on sulfide corrosion or persons competent in this field should be consulted. Apply a good thread compound but avoid excessive amounts. To establish the correct torque for API tubing threads, make up the first few joints to the recommended values and examine the connection.

Tubing reconditioning should be done only in accordance with API specifications. Where internal corrosion is known to exist, the following practices can be employed: 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.

Typical defects are outside and inside pits and longitudinal cuts, transverse laps, and mechanical wear and erosion. When H2S is present in the well fluids, casing of high yield strength may be subject to sulfide corrosion cracking. The operating personnel should ensure that good practices are followed. The placement of thread compound at the root of the rounded API threads with the bearing pressure on the thread flanks the interference fit, power tight makeup produces the sealing mechanism.

The thread compound also provides the lubrication to deter galling. The actual length under tension in the hole can be obtained by consulting graphs that are prepared for this purpose and are available in most pipe handbooks.