Method of oilwell tubing pipe-end upsetting

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and can be used for producing oilwell tubing. Pipe-end upsetting is carried out by forming outer surface of upset part and zone arranged behind upset part, as well as inner surface of upset pipe-end. Forming of upset part outer surface and zone arranged there behind, is performed using upsetting die. Said die has cylindrical and taper sections to form upset part and taper section to form zone behind upset part. Upset pipe-end inner surface is formed by upsetting punch with section for aforesaid forming. OD of said section exceeds by 0.6-1.5 mm the rated ID of oilwell tubing smooth part. Note here that upsetting die and punch are used with due allowance for thermal expansion factor of upset metal making 1.0065 -1.0085.

EFFECT: upset pip-ends that do not require additional machining.

2 dwg

 

The invention relates to pipe production, namely the way the landing of the ends of the tubing.

There is a method of planting ends of the tubing, including the formation of upset portion of the pipe using a landing tool (Express information in dermatopharmacy, ser. "Pipe plant", 1981, issue 3, 12 C.), consisting of two halves landing matrices and landing a punch, aimed to produce thickenings at the ends of the tubing.

The disadvantage of this method is that the landing tool and equipment used for the landing ends (horizontal forging machine F. "Hasenclever") do not provide the necessary accuracy of obtaining the geometrical parameters of the upset ends. If the task of planting pipe with minus tolerances in the landing will not be a complete filling landing caliber of staff planted on the part of the tube), and in the landing pipes plus tolerances formed end and a lateral overflow (due to the inertia of the pressure relief valves on the landing tool), removal of which requires additional mechanical operation.

The closest in technical essence and the achieved result is a way of planting pipe ends, unveiled in SU 95775, 01.01.1953, 21D 22/02 Matrix and the punch combination to the landing of the ends of the tubes out, including the formation of the outer surface of the planted part of the tube and the area behind the planted mentioned part, by landing the matrix and forming the inner surface of the upset end of the pipe by landing a punch.

The disadvantage of this method is that made in this way pipes require additional machining operations upset ends of the tubes, without carrying out mechanical processing pipe does not meet the requirements of API 5CT/ISO 11960:2005, 8th ed., "Requirements for casing and tubing. Technical conditions. ISO 11960: 2004. The oil and gas industry. Steel pipe used as casing and tubing for wells, GOST 633-80 "Pipe tubing and couplings", THE 14-161-198-2002 "Pipe tubing with an elongated outer landing" on an internal and external diameter of the upset part, on the diameter of the pipe at the site for the upset part, naruhodo template for testing internal diameter of the pipe, by the end of the overflow.

The present invention is the creation of a more effective way of landing the ends of the tubing. The expected technical result - getting upset ends, without additional mechanical processing the weave with the dimensions in accordance with the requirements of normative-technical documentation.

The technical result of the invention is provided by the fact that the way the landing ends of tubing comprising forming the outer surface of the planted part of the tubing and the area behind the planted mentioned part, by landing matrixes with cylindrical and conical sections for the formation of the planted part of the tube and a tapered section for forming zone for the upset part, and forming the inner surface of the upset end of the pipe by landing a punch with a plot of the above mentioned formation, made with an outer diameter, 0.6-1.5 mm greater than the nominal internal diameter of the smooth part of the tubing, with use landing matrix and landing a punch with the same coefficient of thermal expansion of planted metal 1,0065-1,0085.

The proposed method is landing all tubing is made using the calibration landing of the matrix (figure 1) and calibration landing punch (figure 2).

Calibration landing matrix forming the outer surface of the upset end of the pipe, consists of 3 sections:

- cylindrical (L1 ) and tapered (L2) - forming planted part of the pipe;

- tapered (L3) - forming zone for the planted part of the pipe; prevents "biting" (hit metal pipe between matrices) pipe and eliminates the pipe section over the planted part of the explicit appearance of the local area, bringing the outside diameter of the pipe beyond the zero variance.

Calibration landing punch, forming the inner surface of the upset end of the pipe, consists of the following sections:

- section length (l1) with diameters (d1 and d2), which is intended for forming the inner surface of the upset end; done diameters (d1 and d2), 0.6-1.5 mm greater than the nominal inner diameter of the smooth pipe section (the working part of the landing plug);

- site length (l2) with diameters (d2and d3) - allow the free passage of peaks punch in the cold pipe "without drafts";

- site length (l3) with diameters (d3and d4) - provides the initial period of the landing of the pipe end (stage repressive) steady state profile of the pipe, preventing the formation of folds, Azimov.

The calculation of the calibration instrument landing was made when the coefficient of thermal expansion of planted metal 1,0065-1,0085. The application of values to which efficient thermal expansion of the metal more 1,0085 or less 1,0065 not provided the requirements of normative-technical documentation, presented to the geometric dimensions of the planted part.

The proposed method is landing all tubing is as follows.

For the landing of the pipe ends landing tool is installed in a hydraulic press. In the initial position, the half landing matrices apart. The heated end of the pipe is inserted into the caliber of the matrix and freely Orient in it. Through the power of the device halves of the matrix are closed and locked from sliding. Landing a punch, centered on the axis of the caliber of the matrix moves to the matrix and is the process of landing the end of the pipe to fill landing caliber formed by landing the matrix and landing a punch. Next, the punch moves away from the drop zone, half of the matrix is opened and the pipe upset end is removed from the press. After cooling planted all, without additional machining, comply with the requirements of normative-technical documentation on the geometrical sizes.

The method was tested and applied on landing hydraulic press company "SMS MEEG"when upsetting tubing size 73×5.5 mm (73,02×mm 5,51), in the amount of 1000 tons, allowed us to obtain 100% compliance with the requirements of normative-technical documentation on the geometric size of the am upset part without additional machining, namely: the actual outer diameter of the cylindrical part of the landing was within the 79.2-79,6 mm (requirements GOST 633-80: 78,6+1,5mm; API 5CT: 78,59+l 59mm); the actual outer diameter of the pipe at the site for the upset part was within 74,0-74,4 mm (requirement 633-80: 73mm; API ST: 73,02mm); the actual inner diameter of the upset part was within the 61.4-61,9 mm and provided with a passage template mandrel diameter of 60.5+0,25mm according to GOST 633-80 diameter 59,62+0,25mm according to the requirements of API 5CT.

The way the landing of the ends of the tubing, including the formation of the outer surface of the planted part of the tubing and the area behind the planted mentioned part, by landing the matrix and forming the inner surface of the upset end of the tubing through landing punch, characterized in that the formation of the outer surface of the planted part of the tube and the area behind the upset part, carried out by landing matrixes with cylindrical and conical sections for the formation of the planted part of the tube and a tapered section for forming zone for the upset part, and the inner surface of the upset end of the pipe form means the landing plug with the site for the said formation, made with an outer diameter, 0.6-1.5 mm greater than the nominal internal diameter of the smooth part of the tubing, used for landing the matrix and landing a punch with the same coefficient of thermal expansion of planted metal 1,0065-1,0085.



 

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