RU2592590C1 - Method for operation of marginal well - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method is implemented by periodic opening of channel between cavity of tubing string and annular space. Tubing is equipped with valve, located above hole pump above liquid dynamic level, parallel to axis of tubing string, which valve is made in form of cylindrical valve box and shutoff element, made from material with density less than density of pumped oil. Upper part of said box is hydraulically connected to tubing string and bottom, to annular space.

EFFECT: continuous operation of marginal well is provided.

1 cl, 2 dwg

Description

The invention relates to the field of oil production, namely to mechanized oil production from unproductive reservoirs.

A known method of oil production, including the descent of the deep pump on tubing into the casing above the reservoir and connecting to the tail pipes, which are lowered to the bottom and pump out the water-logged oil through a check valve located at the lower end of the tail pipes (RF Patent No. 2065026 E21B 43/00, BI No. 22, 08/10/1996).

The disadvantage of this method is that it is intended solely for the production of flooded oil from medium and multi-well wells.

The closest to technological operations is the method of operating a low-production well, which consists in periodic accumulation and its subsequent pumping by a deep pump through the tubing of the fluid in the accumulation cycle in the annulus accumulate gas, and during pumping out of the fluid it is transferred to the tubing, supporting at the same time, in the annulus, the gas pressure equal to the saturation pressure, and during the period of fluid accumulation the gas bypass is stopped (AS No. 1488440 E21 / B 43/00, BI No. 23, 06.23.89 )

However, according to this method, well operation is possible only in a batch mode, the continuous pumping mode is not available.

The task of the proposed method is to ensure the operation of a well producing oil from unproductive formations in a continuous mode.

The problem is solved in that in the method of operating a low-production well by periodically communicating the annulus with the cavity of the tubing according to the invention, the tubing is equipped with a valve located above the deep pump above the dynamic level of the fluid, parallel to the axis of the tubing made in the form a cylindrical valve box and a locking member made of a material having a density lower than the density of the pumped oil, and the upper the part of the said box is hydraulically connected with the tubing, and the bottom with the annulus.

The essence of the method of operating a low-flowing well is that when the dynamic level decreases to the valve level, a hydraulic channel opens that connects the annulus to the tubing cavity, and part of the fluid from the tubing cavity is poured into the annulus, preventing a decrease in the dynamic level before receiving the deep pump.

The implementation of the method is shown in FIG. 1 and 2:

FIG. 1. Operation with the valve closed.

FIG. 2. Operation with the valve open.

The following items are shown:

1 - tubing

2 - downhole pump

3 - valve

4 - dynamic level

5 - valve box

6 - locking organ

7 - hydraulic channel

8 - holes

9 - gas-liquid mixture

10 - annulus.

The method of operation of low-yield wells is as follows.

The locking element may be made of hollow, durable plastic. The dimensions of the valve elements are determined for each specific well condition separately. It is important that the valve opens and closes the communication channel, depending on the magnitude of the dynamic level.

The tubing 1 above the deep pump 2 is equipped with a valve 3 above the dynamic level of the liquid 4, a valve 3 is made in the form of a cylinder, and it is placed parallel to the axis of the tubing 1. The valve 3 consists of a valve box 5 and a shut-off element 6, and through the upper part of the said valve box 5 by the hydraulic channel 7, the tubing 1 communicates with the annulus 10, and the shutoff member 6 of the valve 3 is made of a material having a density less than the density of the pumped oil. Holes 8, made on the bottom and on the cover of the valve box 5, ensure the buoyancy of the shut-off member 6 when the dynamic level 4 is higher than the installation site of the valve 3, closing the channel 7, thereby ensuring the pump is operating normally and the shut-off member 6 is seated on the bottom of the valve box 5 when lowering the dynamic level 4 below the installation location of valve 3 to maintain the liquid level at the pump intake by pouring liquid from the pipes 1 into the annulus 10. Otherwise, in the absence of liquid at the pump intake, It is the inevitable failure of the pumping unit due to burnout of the electric motor, if it is an electric centrifugal pump or jamming of a plunger pair of a rod pump.

At a dynamic level of 4 fluid in the annulus above the location of valve 3, its shut-off member 6, due to the density of its material below the density of the produced fluid, is in the upper position, closing the hydraulic channel 7 in the valve box 5, which allows the deep pump 2 to pump (bypass) gas-liquid mixture through tubing 1 in the normal mode.

The small flow rate of the well does not allow to constantly maintain a high dynamic level 4. Due to the low production rate of the well during the pumping of the gas-liquid mixture 9 by the deep pump 2, the dynamic level 4 decreases. As soon as the dynamic level 4 reaches a mark below the level of attachment of the valve 3, the locking member 6 of the valve 3 moves to the lower position. Part of the gas-liquid mixture through the hydraulic channel 7 of the valve box 5 is passed into the annulus 10, thereby providing a sufficient dynamic level 4 for normal operation of the pump. This prevents a further decrease before receiving the submersible pump 2.

Next, the cycle of increasing and decreasing the dynamic level 9 of the fluid is repeated, the submersible pump 2 operates in a continuous mode, providing oil production from unproductive formations.

Technical appraisal and economic advantages of the proposed method: it is prevented from reducing to receiving a submersible pump, which allows continuous operation of a low-production well, the risks of failure of the submersible pump are reduced, the flow rate of the well is increased, and the technical and economic performance of the well is improved.

Claims (1)

A method of operating a low-production well by periodically opening a channel between the tubing cavity and the annulus, characterized in that the tubing is equipped with a valve located above the deep pump above the dynamic fluid level, parallel to the axis of the tubing made in the form of a cylindrical valve boxes and a locking member made of a material having a density lower than the density of the pumped oil, and the upper part of the said box hydraulically communicate with the tubing, and the bottom with the annulus.

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