Bidirectional compensating device for oil pipe

• Main Authors: GONGMING JI, HOUYI REN, WENQING ZHAI
• Format: Patent
• Language: English
• Published: 14.08.2002
• Edition: 7
• 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 utility model provides a bidirectional compensating device for oil pipe in the oil industry which comprises an upper joint center pipe and a connecting sleeve, etc., wherein, an upper joint, the connecting sleeve and a sealing sleeve are orderly connected, the center pipe is inserted in and passes through the upper joint, the connecting sleeve and the sealing sleeve and is connected with the upper joint by a sliding key, a control mechanism is arranged between the connecting sleeve and the sealing sleeve. The utility model is applied to be connected with tubing strings in various production wells and water injection wells, the tubing strings are shortened while pressed and lengthened while pulled; therefore, the tubing strings are bidirectionally protected and the deformations of the tubing strings are reduced; thereby the utility model has the advantages that manufacturing technique measures are effectively ensured, underground mining tools are protected and production cost is lowered.