CN219412487U - Lining oil pipe for protecting threads - Google Patents

Abstract

The utility model provides a lining oil pipe of protection screw thread, the lining is in oil pipe, there is the oil pipe external screw thread at oil pipe's both ends, the lower part internal screw thread of coupling and the upper end oil pipe external screw thread connection of oil pipe, the lower part external screw thread of upper joint and the upper portion internal screw thread connection of coupling, the upper portion of upper joint has the oil pipe internal screw thread, the upper portion internal screw thread of lower joint and the lower end oil pipe external screw thread connection of oil pipe, the lower joint lower part oil pipe external screw thread matches with the upper portion oil pipe internal screw thread of upper joint, the coupling, oil pipe, become a lining oil pipe after the lower joint is connected into an organic whole, when the lower well or be from the oil well, only need the oil pipe threaded connection or the dismantlement between the lower part of lower joint and the upper portion of upper joint, the connecting screw thread between oil pipe and the coupling, the lower joint need not dismantle, the screw thread at oil pipe both ends can not damage, the lining oil pipe's screw thread need not be restoreed, oil pipe can used repeatedly, can improve lining oil pipe's life.

Description

Lining oil pipe for protecting threads

Technical Field

The utility model relates to equipment for an oil pumping well in an oil field, which is an oil pipe connected with an oil pump, in particular to a lining oil pipe for protecting threads.

Background

In oilfield oil recovery, the tubing is lowered into the casing and the crude oil in the well is pumped through the tubing to the surface. At present, an oil pipe used in an oil field is a metal pipe, one end of the oil pipe is connected with a coupling, and the other end of the oil pipe is an external thread. When the oil pipe is used, the lower end of one oil pipe is connected with the coupling screw thread of the other oil pipe in sequence, so that a channel for flowing crude oil from the bottom of the well to the wellhead is formed. At present, most of oil wells in China are sucker rod pumping wells, and the sucker rod is required to be driven by the pumping unit to reciprocate in an oil pipe to pump crude oil to the ground, so that the service life of the pumping well is short due to the abrasion problem of the sucker rod and the inner wall of the oil pipe. Therefore, each oil field uses a lining oil pipe to pump oil, so that the sucker rod is contacted with the lining, and the oil pipe is prevented from being worn. The existing lining oil pipe is provided with an inner lining made of high polymer polyethylene material, the length of the existing oil pipe is more than 9m (determined by the lifting height and transportation of an operation machine), the inner lining made of the high polymer polyethylene material is arranged in the long oil pipe, the manufacturing process is complex, the processing cost is high, the oil well investment is high, and the service cycle needs to be improved to improve the economy.

After the lining oil pipe is put into the well to be matched with the oil pump rod for production for a period of time, when the lining oil pipe needs to be lifted to the ground for detection and replacement due to reasons such as a pump, a rod, a stratum and the like, the lining oil pipe can be lifted to the ground only after the connection of the external thread of the lining oil pipe and the internal thread of the coupling is unscrewed and disassembled in sequence. Therefore, each time of workover operation needs to connect and disassemble the screw thread of the lining oil pipe, the screw thread (abrasion and deformation) is damaged due to the fact that the screw thread is required to be cut off and then the screw thread is processed, but the inner lining used for corrosion prevention and abrasion prevention is inevitably damaged in the process of cutting off the screw thread, and the lining is only used according to the common oil pipe after being dismantled, so that the high-cost lining is wasted. This method of repairing the tubing threads results in significant economic losses.

Disclosure of Invention

The utility model aims to design a lining oil pipe for protecting threads, which solves the problem that the threads in the lining oil pipe cannot be used according to an inner lining after being damaged, prolongs the service life of the lining oil pipe and reduces economic loss.

The purpose of the utility model is realized in the following way: the oil pipe connecting device comprises an upper joint, a coupling, an oil pipe, an inner bushing and a lower joint, wherein the inner bushing is lined in the oil pipe, the two ends of the oil pipe are provided with oil pipe external threads, the lower internal threads of the coupling are connected with the upper end oil pipe external threads of the oil pipe, the lower external threads of the upper joint are connected with the upper internal threads of the coupling, the upper part of the upper joint is provided with the oil pipe internal threads, the upper internal threads of the lower joint are connected with the lower end oil pipe external threads of the oil pipe, the lower part of the lower joint is provided with the oil pipe external threads, and the lower oil pipe external threads of the lower joint are matched with the upper oil pipe internal threads of the upper joint.

The beneficial effects of the utility model are as follows: the upper joint, the coupling, the oil pipe and the lower joint are connected into a whole to form an inner lining oil pipe, when the inner lining oil pipe is in a well or is out of the well, each inner lining oil pipe only needs to be connected or detached by the oil pipe thread between the lower part of the lower joint and the upper part of the upper joint when being connected or detached, the connecting threads between the oil pipe and the coupling as well as between the lower joint do not need to be detached, the threads at the two ends of the oil pipe are protected from being damaged, and the threads of the inner lining oil pipe do not need to be repaired, so that the inner lining oil pipe can be reused, the service life of the inner lining oil pipe can be prolonged, the investment of the inner lining oil pipe is reduced, and the inner lining oil pipe has obvious economic benefit.

Drawings

Fig. 1 is an assembly view of the present utility model.

Description of the embodiments

An embodiment of the present utility model will be described with reference to fig. 1.

As can be seen from fig. 1, the embodiment of the present utility model includes an upper joint 1, a coupling 2, an oil pipe 3, an inner liner 4, and a lower joint 5, wherein the inner liner 4 is lined in the oil pipe 3, two ends of the oil pipe 3 are provided with external threads of the oil pipe, the internal threads of the lower part of the coupling 2 are connected with the external threads of the upper end of the oil pipe 3, the external threads of the lower part of the upper joint 1 are connected with the internal threads of the upper part of the coupling 2, the upper internal threads of the lower joint 5 are connected with the external threads of the lower end of the oil pipe 3, the external threads of the lower part of the lower joint 5 are matched with the internal threads of the upper part of the oil pipe of the upper joint 1, so that a plurality of basic utility models can be connected into a tubular column to be run into a well.

The upper joint 1, the coupling 2, the oil pipe 3 (the inner wall is provided with the inner bushing 4) and the lower joint 5 are connected into a whole to form an inner lining oil pipe, when the inner lining oil pipe is in a well or is out of the well, each inner lining oil pipe only needs to be connected or dismounted through the oil pipe thread between the lower part of the lower joint 5 and the upper part of the upper joint 1 of the next inner lining oil pipe when being connected or dismounted, the connecting thread between the oil pipe 3 and the coupling 2 and between the lower joint 5 does not need to be dismounted, the threads at the two ends of the oil pipe 3 cannot be damaged, and the oil pipe threads at the two ends of the oil pipe 3 do not need to be repaired, so that the inner lining oil pipe can be reused. After the lower oil pipe thread of the lower joint 5 or the upper oil pipe thread of the upper joint 1 is damaged by multiple disassembly or connection, the upper joint 1 or the lower joint 5 can be replaced to repair the utility model without damaging the inner lining 4, so the utility model has a long service cycle.

Claims (1)

1. The utility model provides a lining oil pipe of protection screw thread, includes top connection (1), coupling (2), oil pipe (3), inner liner (4), sub-unit (5), and inner liner (4) are lined in oil pipe (3), and there is the oil pipe external screw thread at the both ends of oil pipe (3), the lower part internal screw thread of coupling (2) and the upper end oil pipe external screw thread connection of oil pipe (3), characterized by: the lower external thread of the upper joint (1) is connected with the upper internal thread of the coupling (2), the upper part of the upper joint (1) is provided with an oil pipe internal thread, the upper internal thread of the lower joint (5) is connected with the lower end oil pipe external thread of the oil pipe (3), the lower part of the lower joint (5) is provided with an oil pipe external thread, and the lower oil pipe external thread of the lower joint (5) is matched with the upper oil pipe internal thread of the upper joint (1).