Guide device for coiled tubing

摘要

A coiled tubing guide-in device is applied to oil field coiled tubing operation and used for guiding a coiled tubing into injector head gripper blocks. The coiled tubing guide-in device mainly consists of a slip connecting head, a locking sleeve, a floating sleeve, a guide head, and a traction steel rope. In the structure of the slip connecting head, a cone of an expansion plug is arranged in a slip sleeve. A lower end of a tightening nut is a convex spherical body. At a lower end of the tightening nut, an end of a traction steel rope is fixed in a rectangular groove at the lower end of the tightening nut through a threaded pin. In the structure of the locking sleeve, an upper end surface of a spherical support body is a concave spherical surface. An inner conical sleeve and an outer conical clamping sleeve are arranged in a cylindrical space. A spherical head is fixed on inner screw threads of the spherical support body. The number of combined locking bodies ranges from 4 to 15. A lower end of the floating sleeve at the lowest end is connected with a conical guide body through the traction steel rope. The effect is that the coiled tubing is fast and safely pulled out of a tubing reel and guided into the injector head gripper blocks through a guider.

主权项

1. A coiled tubing guide-in device, mainly comprising a slip connecting head, a locking sleeve, a floating sleeve, a guide head, and a traction steel rope, wherein
the slip connecting head mainly consists of an expansion plug, a slip sleeve, and a tightening nut; the expansion plug consists of a cone and a screw thread body, the cone is connected with the screw thread body, center lines of the cone and the screw thread body are on the same straight line, a major diameter end of the cone at an end of the expansion plug is at an external end, a minor diameter end of the cone is connected to an end of the screw thread body of the expansion plug, and the screw thread body is cylindrical and is provided with screw thread body screw threads on an outer wall; the slip sleeve is cylindrical, an outer wall of the slip sleeve is provided with ring teeth, an inner wall of the slip sleeve is a conical surface, and a taper of the conical surface of the slip sleeve is the same as that of the cone of the expansion plug; the cone of the expansion plug is in the slip sleeve; a wall of the slip sleeve is provided with an axial gap; the screw thread body of the expansion plug is connected with the tightening nut, and an upper end surface of the tightening nut contacts with a lower end surface of the slip sleeve; an outer wall of the tightening nut is cylindrical, and an end of the tightening nut is provided with inner screw threads; a lower end of the tightening nut is a tightening nut convex spherical body, and the lower end of the tightening nut is provided with a rectangular groove along an axial direction; the lower end of the tightening nut is provided with a screw hole, and the screw hole is perpendicular to the rectangular groove at the lower end of the tightening nut; a threaded pin is fixed in the screw hole at the lower end of the tightening nut; an end portion of the threaded pin passes through a rope loop of the traction steel rope to fix an end of the traction steel rope in the rectangular groove at the lower end of the tightening nut; the locking sleeve mainly consists of a spherical support body, an inner conical sleeve, an outer conical clamping sleeve, a preloaded nut and a spherical head; the spherical support body is cylindrical, an upper end surface of the spherical support body is a concave spherical surface, and a spherical support body center hole is provided at the center of the concave spherical surface; a cylindrical space is provided at a lower portion of the spherical support body center hole in the spherical support body, and center lines of the cylindrical space and the spherical support body are on the same straight line; the inner conical sleeve and the outer conical clamping sleeve are arranged in the cylindrical space, an outer wall of the inner conical sleeve is cylindrical, a conical hole is provided in the inner conical sleeve, and the outer conical clamping sleeve is arranged in the conical hole in the inner conical sleeve; the outer conical clamping sleeve consists of two same gripper blocks, opposite rear outer walls of the two gripper blocks are conical, and ring teeth are provided on a wall of the spherical support body center hole; inner screw threads are provided on a lower end of the spherical support body; the preloaded nut is disposed on the inner screw threads of the spherical support body, an outer wall of the preloaded nut is provided with preloaded nut screw threads, the preloaded nut is provided with a preloaded nut center hole, and the traction steel rope is capable of passing through the preloaded nut center hole of the preloaded nut; the spherical head is fixed on the inner screw threads of the spherical support body; the spherical head is cylindrical, an outer diameter of the spherical head is the same as that of the spherical support body, a cylinder of external screw threads is protruded from an upper end surface of the spherical head, and the external screw threads are capable of being connected to the inner screw threads of the spherical support body; a lower end of the spherical head is provided with a spherical head convex spherical body; the spherical head is provided with a spherical head center hole; the traction steel rope passes through the spherical support body center hole, a spherical head center hole of the outer conical clamping sleeve, the preloaded nut center hole and the spherical head center hole; the spherical head convex spherical body at the lower end of the tightening nut is in the concave spherical surface at an upper end of the spherical support body; the floating sleeve is formed of connected screw threads of the spherical support body and the spherical head, the traction steel rope passes through the center hole of the spherical support body of the floating sleeve and the center hole of the spherical head of the floating sleeve; one locking sleeve and one or two floating sleeves form a group of combined locking body, and are connected through the traction steel rope; the convex spherical surface is inserted in the concave spherical surface; the number of combined locking bodies ranges from 4 to 15; a lower end of the floating sleeve at the lowest end is connected with a conical guide body through the traction steel rope; and the guide head consists of the spherical support body, the inner conical sleeve, the outer conical clamping sleeve, the preloaded nut and the conical guide body; the structure of the guide head is substantially the same as that of the locking sleeve, and a difference is that the conical guide body is conical, an upper outer diameter of the conical guide body is the same as an outer diameter of the spherical support body, a lower end of the conical guide body is provided with a conical guide body convex spherical body; the conical guide body is provided with a conical guide body center hole, and the traction steel rope passes through the conical guide body center hole.