SU1229449A1 - Method of gas lift liquid delivery in column from well - Google Patents

Description

}

,15

to yu

f in

1

The invention relates to the oil industry and can be used in the gas-lift method of oil extraction, mainly in the batch mode.

The aim of the invention is to reduce the gas flow "

Figure 1 shows the process cycles of operation of the device for carrying out the proposed method, equipped with a packer for disconnecting the annulus from the near-wellbore zone; Fig, 2 - scheme of operation of the device without packer

The device comprises a column 1 located in the well 2, a packer 3, a pressure regulator 4 in the annular space between the column 1 and the well 2, a gas discharge 5 and reverse valves.

The method of gas-lift supplying fluid to a column of wells) is dried, as follows,

The well column 2 is lowered into the well 2, on the shoe of which a check valve 6 is installed. The annular space is sealed at the shoe of the lifting column with a packer 3. To regulate gas injection cycles in the lifting column 1 above the packer 3, a gas-lift valve 5 is set, which is set to a predetermined pressure drop. The gas pressure in the column in the annular space is stabilized by the pressure regulator 4, which is installed on the gas pipeline. If the pressure in the gas supply system is stable, the pressure regulator 4 can be omitted.

Run skvshkinu. If the pressure in the supply network permits the pumping without starting valves, then one gas-lift valve 5 is installed, if not, then additionally, to the lifting column 1 above the gas-lift: valve 5 installs the required number of valve starts.

After prodding, the well is placed on the inflow. The technological cycle proceeds - by. following phases.

Phase-A (figure 1). In the annular space of borehole 2, the preset working pressure of gas (Pcc const) is maintained by means of the pressure regulator 4. At the same time, due to some depression from the reservoir, liquid flows into the lifting column 1, which accumulates above the gas-lift valve 5, while the pressure at valve 5

94492

(RTHR) increases, and the differential pressure (rR) decreases (L.R.Rrag-PrPsS)

Phase B. Above the gas lift valve 5, a predetermined (calculated) column has been accumulated,. fluid. The pressure difference across the gas-lift valve 5 decreases to the value to which the valve 5 is set, (dR Gas-lift valve 5 opens, the gas 43 of the annular space 0 enters the lifting column 1 and raises (displaces) above the gas-lift valve. 5 liquid column (the valve remains open, as the pressure differential decreases by the value of hydrodynamic resistances that prevent the movement of the liquid).

Phase B, the column of fluid reaches the wellhead and flows into the flow line, the pressure in the lifting column 1 decreases, and the pressure differential increases. At the moment when the pressure differential reaches the value at which the gas injection began (), the gas injection stops - the valve 5 is closed-5.

Phase D, The gas under the liquid column expands, displaces the remains of the JS1-SCHKOSTI from the lifting column 1 into the discharge line and pushes it to the collection point. The pressure in the lifting column 1 at valve 5 decreases, and the depression to the formation increases by the amount of hydrostatic l; effects created by a liquid column. Due to the increased depression, fluid 2 flows intensively through the check valve 6, and the cycle repeats.

If it is necessary to change the bottomhole pressure (well flow rate) with the help of the pressure regulator 4, the pressure in the annulus () is changed by the required value. At the same time, when the operating pressure increases, the liquid column accumulated above the gas-lift valve 5 (Fig. 1) and the bottomhole pressure increase accordingly, and when it decreases, the height of the column and the bottomhole pressure decrease accordingly (the flow rate increases), and in the first case the number of operating cycles decreases and secondly it increases.

40

45

;Yu

The difference in the operation of the plant without par 3 (Fig. 2) is that after cessation of gas supply to the lifting column i, i.e. after closing the gas-lift valve 5, part

312294494

fluids from the annular space vom space decreases, and in

flows into the lifting column 1, while the liquid level in the ring-lifting column 1 is raised (phase D).

vom space decreases, and in

lifting column 1 is repeated (figure 2, phase D).

rt-p-: i --- III

f- f --- T-s

jjSt

AT

FIG. 2

Compiled by N.Ivankov Editor O.Yurkovetska Tehred V.Kadar Proofreader A.Obruchar

Order 2435/33 Circulation 586 Subscription All-Russian Institute of Scientific and Technical Studies of the USSR State Committee for Inventions and Discoveries 4/5, Moscow, Zh-35, Raushsk nab. 113035

Production and printing company, Uzhgorod, Projecto st., 4

 I

t-p-:

T-jjSt

AT

Claims (1)

METHOD FOR GAS-LIFTING FLOW OF LIQUID TO A COLUMN FROM A WELL, which consists in injecting gas into the annular space between the casing and the well, followed by cyclic gas supply to the casing by changing the differential pressure in the annular space and in the casing at the gas inlet point, characterized in that, in order to reduce gas flow, gas supply to the column is started and stopped at the same pressure drop between the annular space and the column. * 1229449 A1 1 122