SU1229302A1 - Method of reparing articles of oilfield equipment with threaded joints - Google Patents

Description

The invention relates to the repair of pump rods used in oil production and operating under conditions of wear and fatigue loading.

The circuit of the invention is the restoration of the performance of the pump rod.

FIG. Figure 1 schematically shows the pump rod, having reached the limiting state due to corrosion wear or breakage along the thread and cut off by the stop collar; FIG. 2 shows the process of welding a billet; Fig. 3 shows a machined shoulder of a pump rod with two stages.

Rods that have reached the limiting state due to wear, corrosion or breakage on the thread are cut along the stop collar (Fig. 1), maintaining the size K

so se

TO

way to ensure 20

- 0,22 - 0,27,

where D is the arithmetic mean value of the diameter of the collar with two mutually perpendicular measurements.

Then (FIG. 2), the bar prepared in this way is welded, by friction, the blank 2 with a stop collar diameter equal to the collar D For a given rod size plus a tolerance for misalignment arising during welding.

After welding, mechanical processing removes the burr and the seam allowance on the external surface, obtaining a threaded part and thrust collar, and the thrust collar is made stepped with a diameter of a small.-Stage 3 smaller than a diameter of a larger stage 4 by the value of twice rods.

In order to obtain a high-quality welded joint, it is necessary to ensure, at the place of welding, such geometric dimensions of the rods that would provide for the repair (St.arku) of any of the rods during welding, optimal for the maximum value.

2293022

leads to an increase in the specific heating pressure and to an increased deposit during friction welding. This can cause the metal to heat up to a ductile state that is close to the square of the rod, which, when pierced, causes the edges of the square to bend inwards and make it impossible to fit the dl key. sv: injection - unscrewing

10 rods for tripping operations during well repair.

A decrease in the diameter D leads to a decrease in the resistance to deformation during heating, and it is possible that

15 when by the time the precipitation reaches a predetermined value, the joint will not be heated to the required temperature, which is attributed to the welding defect. Therefore, as well as taking into account the size of the zone of thermal influence when welding rod steels and the tolerance for stamping lower

The ratio limit is accepted.

equal to 0.22 This same ratio to get more than J to 0.27 cannot be, since it determines the placement of the heat affected zone and is limited by the design parameters of the rods. Thus, only with a ratio of 30 width of the collar to its diameter, equal to 0,22-0,27, is a strong, welded: by friction seam.

35

40

During operation, pump rods are subjected to wear on the walls of tubing pipes, resulting in wear of the thrust collar and then a turnkey square, which leads to a failure of the rod due to the impossibility of keeping the rod wrench on the square .onfitting The execution of the thrust collar by the stucco 5 with the diameter of the small step smaller than the diameter of the larger step by the value of twice the 45 value of the allowable wear of the collar allows determining the moment of reaching the allowable amount of wear when There is damage square turnkey. When the signs of wear appear on a small step of the collar, the operation of the pump rod should be stopped.

50

During operation, the pump rods are subjected to wear on the walls of the tubing, as a result of which wear occurs on the thrust collar and then on the wrench square, which leads to the failure of the rod due to the impossibility of keeping the rod wrench on the square when lifting and descending. The implementation of a thrust collar with a 5 step small diameter less than a larger diameter greater than the doubled value of the allowable wear of the shoulder, allows you to determine when the allowable amount of wear is reached when t damage square turnkey. When the signs of wear appear on a small step of the collar, the operation of the pump rod should be stopped.

at

Phage. 2

Fig.Z

Editor S.Lyzhova

Compiled by V.Zharov Tehred M.Hodanich

2425/26

Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Corrector.A.T.

Claims (1)

METHOD FOR REPAIR OF PRODUCTS OF OIL-PRODUCING EQUIPMENT WITH THREAD- BY YOUR COMPOUNDS, including a segment of an unusable threaded connection with a thrust collar and friction welding of a new workpiece followed by its mechanical processing, characterized in that, in order to restore the pump rod to serviceability, a segment of an unfit for operation threaded connection is produced along the thrust collar, and the width ratio the remainder of the shoulder to its diameter is 0.22-0.27, and after welding a new workpiece, the machining of the thrust shoulder is performed stepwise with a diameter scarlet stupe- <g or smaller diameter greater degree by the amount of twice the permissible wear collar rod.