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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However, the makeup torque may vary depending on the thread coatings and lubricant type; thus, adjustments in makeup torque values are sometimes required.
These investigations should cover: In addition to the body, the tubing upset and threads often require inspection, typically by magnetic powder and use of apii gauges. Use of power tongs is necessary to obtain consistent makeup torque. Protection criteria for casing differ somewhat from the criteria used for line pipe. The length of each piece of tubing shall be measured prior to running.
Tubing inspection and handling
Where conditions favorable to pai exist, a qualified corrosion engineer should be con- sulted. Environmentally non-damaging thread compounds meeting API thread-compound performance requirements are available. Physical properties are checked and each length hydrostatically tested, normally to only 3, psi in the plain end unthreaded condition. Literature on sulfide corrosion or persons competent in this field should be consulted.
Various nondestructive inspection services have been employed by users to ensure that the desired quality of tubing is being run.
To determine the value and effectiveness of the above practices and measures, cost and equipment-failure records can be compared before and after application of control mea- sures. In flowing wells, packing the annulus with fresh water or low-salinity alkaline muds. Tubing can ai damaged during shipment, at the wellsite, and during running and pulling. For transportation, slightly wpi procedures are needed to prevent damage depending on whether shipped by water, rail, or truck. The following are also checked:.
Follow the API recommended tubing makeup torque for nonupset, external-upset, and integral-joint tubing. When H2S is present in the well fluids, casing of high yield 5c may be subject to sulfide corrosion cracking. There are several types of tubing inspection methods that may be beneficial. The compound is a mixture of metallic and graphite powders uniformly dispersed in a grease base. Typical defects are outside and inside pits and longitudinal cuts, transverse laps, and mechanical wear and erosion.
Ordinarily, pumping wells should 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. The common methods of inspecting the tubing apl in use in field operation are:. A properly designed cathodic protection system simi- lar to that used for line pipe, which can alleviate external casing corrosion.
Slip and tong marks are injurious. The concentration of H2S necessary to cause cracking in dif- ferent strength materials is not pai well defined.
Care must be taken in unloading and storage. Apply a good thread compound but avoid excessive amounts. Tong c51 should fit properly and conform to the curvature of the tubing. The thread compound also provides the lubrication to deter galling. 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.
Download API RP 5C1 – pdf
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.
In general, the high-strength materials are more susceptible to handling damage. 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.
Collar-type tubing elevators are adequate for API nonbeveled couplings; however, slip-type elevators are recommended when appi tubing with beveled couplings, special clearance couplings, and integral joint tubing. Check spider slips to ensure they will not damage the tubing body. If the stand-off is abnor- mally great, check the coupling for tightness. The total of the individual lengths so measured will represent the unloaded length of the tubing string.
Tubing should be stacked on racks following proper procedures, and tubing in storage should be inspected periodically and protected from corrosion. The c51 personnel should ensure that good practices are followed. Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro.
A steel tape calibrated in decimal feet millimeters to the nearest 0. 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. If needed, adjust torque and repeat.