CN202731766U - Oil production wellhead electric heater safety valve adapter - Google Patents

Abstract

The oil recovery well head electric heater relief valve crossover sub is applied to the connection of oil recovery well head electric heater relief valve in oil field. Including upper end cylinder and lower extreme cylinder, the characteristic: the upper end cylinder and the lower end cylinder are connected together, and the central line of the upper end cylinder and the central line of the lower end cylinder are on the same straight line. The large cylinder at the upper end is provided with internal threads, and the specification of the internal threads is consistent with that of external threads at the lower end of a safety valve of the electric heater; the lower end of the outer wall of the large cylinder at the upper end is provided with symmetrical wrench clamping squares; the outer wall of the lower small cylinder is provided with external threads, and the external threads of the lower small cylinder are consistent with the external threads of a joint welded on a pipeline; a central hole is arranged in the lower small cylinder, and the central hole of the lower small cylinder is communicated with the inner cavity of the upper large cylinder. The effect is as follows: the safety valve of the electric heater can be installed, the sealing requirement is met, and the defect that the safety valve of the electric heater is not matched is eliminated.

Description

Oil production wellhead electric heater safety valve adapter

technical field

The utility model relates to the technical field of oil production wellhead machinery in oil fields, in particular to a connection joint of an electric heater safety valve at the oil production wellhead, which is a conversion joint for the safety valve of the oil production wellhead electric heater.

Background technique

At present, the oil production wellhead electric heater is an electric heating device for heating the fluid produced by the oil well, reducing the viscosity and improving the transportation capacity. Electric wellhead heaters are widely used in northern oilfields. The safety valve installed on the wellhead electric heater is an important safety accessory. Due to different electric heater manufacturers, the specifications and models of the safety valve are also different, and the structural specifications of the connection are also different. The safety valves of some electric heaters installed earlier are different from the safety valve installation joint specifications of the existing electric heaters. After the safety valve of the earlier electric heater was damaged, the original joint could not be installed with the safety valve of the existing electric heater. The seals of some safety valves fail and must be scrapped, while the spare safety valves on the production site have only one type; the set pressure of some safety valves does not match the pressure that the electric heating body can withstand, and the safety protection of the safety valve cannot be achieved. role, making electric heating equipment there are certain safety hazards.

Utility model content

The purpose of this utility model is to provide a safety valve conversion joint for oil wellhead electric heaters, so that various types of wellhead electric heater safety valves can be unified into spare safety valve models at the production site, which is convenient for on-site production management and eliminates safety hazards in winter.

The technical solution adopted by the utility model is: the oil production wellhead electric heater safety valve conversion joint, including the upper cylinder and the lower cylinder, which is characterized in that: the upper cylinder and the lower cylinder are connected together, and the center line of the upper cylinder and the lower cylinder are connected together. The center lines of the cylinders at the lower end are on the same straight line. The large cylinder at the upper end has an internal thread, and the specification of the internal thread is consistent with the external thread at the lower end of the safety valve of the electric heater; there is a symmetrical wrench chi square at the lower end of the outer wall of the large cylinder at the upper end; there is an external thread on the outer wall of the small cylinder at the lower end , the outer thread of the small cylinder at the lower end is consistent with the external thread of the joint welded on the pipeline; there is a central hole in the small cylinder at the lower end, and the central hole of the small cylinder at the lower end communicates with the inner cavity of the large cylinder at the upper end.

The external thread of the small cylinder at the lower end is M20; the internal thread of the large cylinder at the upper end is M35.

The external thread of the oil production wellhead electric heater safety valve conversion joint is connected to the joint welded on the pipeline, and the wrench is clamped on the wrench clamp to tighten. The wrench card is convenient for installation and disassembly, the internal thread is consistent with the external thread type at the lower end of the existing safety valve, and the central hole is a channel for conducting the fluid pressure in the electric heater.

Beneficial effects of the utility model: the utility model electric heater safety valve conversion joint for oil production wellhead can install the electric heater safety valve and meet the sealing requirements, eliminating the lack of mismatching of the electric heater safety valve.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model oil wellhead electric heater safety valve conversion joint structure.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a left side view of Fig. 1 .

In the figure, 1-external thread, 2-wrench chi square, 3-internal thread, 4-central hole.

Detailed ways

Embodiment 1: Taking an oil production wellhead electric heater safety valve conversion joint as an example, the utility model is further described in detail.

See Figure 1. The utility model relates to a conversion joint for a safety valve of an electric heater at the head of an oil production well, which comprises an upper cylinder and a lower cylinder. The upper cylinder and the lower cylinder are connected together, and the centerline of the upper cylinder and the centerline of the lower cylinder are on the same straight line. The large cylinder at the upper end has an internal thread 3, and the internal thread 3 of the large cylinder at the upper end is M35. The specifications of the internal thread 3 are consistent with the external thread at the lower end of the safety valve of the electric heater. There is a symmetrical spanner square 2 at the lower end of the outer wall of the large cylinder at the upper end, and the distance between the two planes of the spanner square 2 is 40 mm. External thread 1 is arranged on the outer wall of the small cylinder at the lower end, and the external thread 1 of the small cylinder at the lower end is M20. The external thread 1 of the small cylinder at the lower end is consistent with the external thread of the joint welded on the pipeline; there is a central hole 4 in the small cylinder at the lower end, and the diameter of the central hole 4 is 12 mm. The central hole 4 of the small cylinder at the lower end communicates with the inner cavity of the large cylinder at the upper end.

Claims (2)

1. production wellhead electric heater safety valve crossover sub, comprise upper end cylinder and lower end cylinder, it is characterized in that: the upper end cylinder is in the same place with the lower end cylinder connection, and upper end cylinder center line and lower end cylinder center line are on the same straight line; The upper end large cylinder has internal thread (3), and the specification of internal thread (3) is consistent with electric heater safety valve lower end external screw thread; Symmetrical spanner card side (2) is arranged in the outer wall lower end of upper end large cylinder; Outer wall at the lower end small cylinder has external screw thread (1), and the joint external screw thread that welds on the external screw thread of lower end small cylinder (1) and the pipeline is consistent; Centre bore (4) is arranged in the small cylinder of lower end, and the centre bore of lower end small cylinder (4) is communicated with upper end large cylinder inner chamber.

2. production wellhead electric heater safety valve crossover sub according to claim 1 is characterized in that: that the external screw thread (1) of described lower end small cylinder adopts is M20; That the internal thread (3) of upper end large cylinder adopts is M35.

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