Coupling-free direct connecting spinning joint oil pipe

• Main Authors: FENG YUMING, XU CAIBIN
• Format: Patent
• Language: English
• Published: 27.05.2015
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to a coupling-free direct connecting spinning joint oil pipe, which consists of an internal screw thread connecting end, a transition section, a pipe body section and an external screw thread connecting end, wherein the wall thickness of the internal screw thread connecting end and the wall thickness of the transition section respectively correspond to the wall thickness of a pipe body of the pipe body section. Compared with an ordinary coupling connected oil pipe, the coupling-free direct connecting spinning joint oil pipe has the advantages that under the condition that the inner diameter of a casing pipe is not changed, the inner diameter dimension maximization of the oil pipe can be realized, and the connection intensity and the sealing performance at the screw thread connecting part of the oil pipe can be ensured; reinforcing ribs are uniformly arranged on the transition section along the circumferential direction, so that the connection intensity between the transition section and the internal screw thread connecting end is improved, the inner hole dimension of the oil pipe at the screw thread connecting part is consistent, the gap formed between pipe bodies arranged in the middle and at two ends during coupling connection is eliminated, the eddy generated by the fluid in the middle of the coupling is avoided, and the flowing pressure loss of an oil body in the oil pipe is reduced.