CN202381057U - Simple casing gas recovery device - Google Patents

Abstract

The utility model discloses a simple casing gas recovery device, which is designed for solving the recovery problem of oil well casing gas. The device is a special valve installed between the tubing and casing of the oil well. When the pumping unit is downstroke, the casing gas is discharged into the tubing. When the pumping unit is upstroke, crude oil and casing gas enter the oil collection process together. The device can solve the problem that the constant pressure valve is easy to freeze and block in winter, so that the casing gas of the oil well cannot be recovered; it can reduce the back pressure of the oil well, and the recovered casing gas volume is higher than that of the constant pressure valve; Fully meet the requirements of oil recovery technology; simple operation, easy maintenance, simple construction and installation, no need for hot work.

Description

Simple casing gas recovery device

technical field

The utility model relates to a simple casing gas recovery device, which belongs to the technical field of oil and gas field development.

Background technique

Part of the casing gas in Changqing Oilfield was "flared" on the well site and burned, causing environmental pollution and energy waste. At present, for oil wells with high casing gas pressure, constant pressure valves are used to connect the casing annulus to enter the oil and gas gathering and transportation. In recent years, field tests such as air pumps, synchronous rotary compressors, and gas-fired power generation have also been carried out, but none of them have formed a series of products. The recovery of casing gas by the constant pressure valve is to install a constant pressure valve between the oil outlet pipeline of the wellhead tubing of the pumping unit and the outlet of the annular space. Transported together with crude oil.

But in winter, the constant pressure valve is easy to freeze and block, and the oil well casing gas cannot be recovered, and the constant pressure cannot be adjusted. When the back pressure of the oil well is high, the recovered gas volume gradually decreases, the deep well pump efficiency decreases, and the gas lock is easy to form. Casing gas in most well sites cannot be recovered in winter by using constant pressure valves.

Contents of the invention

The purpose of the utility model is to provide a simple casing gas recovery device, which has the functions of preventing freezing blockage, automatically collecting casing gas and adjusting the constant pressure value of casing gas.

Concrete technical content of the present utility model is as follows:

The upper and lower ends of the oil pipe joint are respectively connected to the oil pipe inlet and the oil pipe outlet. In the middle of the oil pipe joint, there is a casing air inlet perpendicular to the direction of the oil pipe. A cone-shaped valve core and a compression spring are arranged inside the casing air inlet. The compression spring connects Adjustment bolt located on the outside of the fuel line connector. A check valve core and a spring are arranged in the oil pipe joint.

During the downstroke of the pumping unit, the crude oil flows back, the check valve core is closed, the external back pressure is blocked, and a decompression space is formed in the oil pipe. When the casing air pressure is higher than the oil pressure, the conical spool opens to discharge the casing gas into the tubing; when the pumping unit is upstroke, the oil pressure is higher than the casing pressure, the conical spool closes, the check valve opens, and the crude oil and casing The gas enters the oil collection process together. Since the crude oil flows through the outer wall of the casing gas inlet pipe, a heating device can be installed to heat the conical valve core and spring when the crude oil flows, so as to avoid freezing and blocking when the casing gas enters in winter.

The simple casing gas recovery device of the utility model can solve the problem that the constant pressure valve is easy to freeze and block in winter, so that the oil well casing gas cannot be recovered; it can reduce the back pressure of the oil well, and the recovered casing gas volume is higher than that of the constant pressure valve; The constant pressure is adjustable, which can better meet the requirements of the oil production process; the operation is simple, easy to maintain, easy to construct and install, and no hot work is required.

Description of drawings

Figure 1 is a schematic diagram of the structure of a simple casing gas recovery device.

Figure 2 is a working schematic diagram of a simple casing gas recovery device.

Detailed ways

Example:

The embodiment of the utility model is further described with reference to Fig. 1 and 2:

This is a special valve installed between the tubing and the casing of the oil well. The device has a casing gas inlet, a crude oil inlet and a crude oil outlet. Thread the upper and lower ends of the oil pipe joint 6 to the oil pipe inlet 1 and the oil pipe outlet 9 respectively, install the casing air inlet 2 in the middle of the oil pipe joint 6 along the direction perpendicular to the oil pipe, and set a cone valve inside the casing air inlet 2 The core 3 and the compression spring 7, the compression spring 7 is adjusted by the adjustment bolt 8 located outside the oil pipe joint 6. A check valve core 4 and a spring 5 are arranged in the oil pipe joint 6 .

The standpipe nipple of the wellhead crude oil pipeline can be removed on site, and a simple casing gas recovery device can be installed in the middle of the standpipe. The inlet and outlet 1 and 9 of the oil pipe are connected with screws, which can be directly connected to the wellhead pipe fittings; the casing gas inlet 2 Equipped with a special hose 10 with a union, one side is connected to the casing gas inlet 2 of the device, and the other side is connected to the casing gas reserved port 11 of the oil well.

Claims (1)

1. A simple casing gas recovery device, characterized in that the upper and lower ends of the oil pipe joint (6) are connected to the oil pipe inlet (1) and the oil pipe outlet (9) respectively, and the middle part of the oil pipe joint (6) is provided with a Casing gas inlet (2) in the oil pipe direction, the inner side of the casing gas inlet (2) is provided with a cone-shaped valve core (3) and a compression spring (7), and the compression spring (7) is connected to the adjustment valve located outside the tubing joint (6). The bolt (8); the oil pipe joint (6) is provided with a check valve core (4) and a spring (5). the

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