FIELD: oil and gas producing industry.
SUBSTANCE: invention is designed to prevent formation of excessive concentrations of stresses in tubing string. Proposed expansion bend has flexible member, fastening members and housing connected with tubing string by means of thread. Said housing accommodates tube with flexible member whose ends are fixed in housing and in tube by fastening members. Expansion bend is connected to pumping unit by sub secured in lower part of tube. Flexible member is made in form, of torsional spring. Use of proposed expansion bend in pumping unit reduces loads at its starting and stopping.
EFFECT: improved reliability of well equipment by improving shock absorbing properties of said equipment.
1 dwg
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