Screw together technique of heavy caliber petroleum sheathed tube
An oil casing and large-diameter technology, which is applied in the field of large-diameter oil casing screwing technology, can solve the problems of inability to produce oil casing, low degree of automation, and less than 40% screwing pass rate, and achieve rich product specifications , the effect of meeting the requirements of use
Active Publication Date: 2009-07-15
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology
Because of this, many small-scale enterprises cannot produce such large-diameter oil casings, and some enterprises have a low degree of automation in the process of screwing detection and control, and even do not perform parallel detection of torque and J value in the production process, which is inevitable. The so-called "sacrificing torque to obtain J value" occurs
[0011] The screwing rhythm of small-diameter oil casing can reach 70 pieces / hour, and the qualified rate of screwing is over 98%, while the screwing rhythm of Φ339mm casing is only 20 pieces / hour, and the qualified rate of screwing is less than 40%. , the existing screwing technology is difficult to cope with the batch screwing of Φ339.72mm and larger diameter oil casing
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[0032] The screwing process of the large-diameter oil casing of the present invention will be described in conjunction with the accompanying drawings and embodiments.
[0033] The screwing process includes the pre-tightening and screwing stations of the screwing machine. When screwing large-diameter oil casings, the direct reason for the slow pace and low pass rate is that the workload of the pre-screwing station is small and the screwing The reception desk is overwhelmed. From the perspective of machining, pre-tightening is rough machining, while screwing is finishing. Most of the work should be done in pre-tightening. However, the actual problem encountered is just the opposite. When screwing large-diameter oil casings, the screwing stations share a huge part of the workload.
[0034] The screwing process of the large-diameter petroleum casing of the present invention includes two stations of the screwing machine, pre-screwing and screwing, and the steps are as follows:
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The present invention provides a large-diameter petroleum casing screwing process, the screwing process includes two stations of screwing machine, pre-screwing and screwing. ②Real-time adjustment of the matching relationship between the coupling rotation motion and the axial feed motion; ③Dynamic error correction to find the center line of the coupling to achieve the coincidence of the center line; screwing station: the screwing station passes two pressure The sensor detects the height of the jig trolley in real time, and adjusts its height in real time through the servo valve, so that the centerline of the pipe body coincides with the centerline of the screwing plate. The beneficial effect is that after using this technology, the screwing rhythm of large-diameter specification casings can be stabilized at 40 pieces per hour, so that the qualified rate of one-time screwing is above 94%, which solves the problem of fast and accurate screwing of large-diameter and oil casings. Screwing problem.
Description
technical field [0001] The invention relates to a production process of an oil casing, in particular to a screwing process of a large-diameter oil casing. Background technique [0002] During the production process of the casing, the two ends of the pipe shall be threaded, and then one end of each casing shall be threaded. [0003] (Only one end) screw on the coupling, screw half of the coupling into the casing, and leave the other half of the coupling for the oil field to connect to the other casing, that is, the end of the casing that is not screwed on the coupling. [0004] In the oil field, oil casing pipes are run end-to-end one by one, with a depth of several thousand meters. They are tested under harsh geological conditions in geological rock formations below several thousand meters. They must have comprehensive properties such as resistance to distortion, impact resistance, and corrosion resistance. . The connection between the two pipes is the weakest link of the ...
Claims
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IPC IPC(8): E21B19/16
Inventor 白宇新阙升和侯丙辛马恺田振金张军李明星张帆
Owner TIANJIN STEEL PIPE MFG CO LTD