Method for removal of killing liquid from gas well at formation pressure below hydrostatic pressure

FIELD: oil and gas industry.

SUBSTANCE: as per the method, continuous lowering of a flexible pipe is performed into an internal cavity of tubing string to the well bottom. Gas is supplied to the well annular space. At the same time, gas is supplied to the space between the flexible pipe and the tubing string directly from the pipeline of the same well. Killing liquid is removed to day surface via the flexible pipe. Gas is supplied when the flexible pipe achieves killing liquid level. The flexible pipe is lowered at the specified speed from killing liquid level to the well bottom. Flexible pipe lowering speed and minimum required gas consumption providing killing liquid removal to day surface is determined as per an analytical expression.

EFFECT: improving efficiency of removal of killing liquid from a gas well due to continuous removal of liquid, reduction of gas consumption and power consumption.

1 ex, 1 dwg

 

The invention relates to the oil and gas industry, namely to method of removal of killing fluid from the gas well with a formation pressure below hydrostatic.

The known method of removal of killing fluid from the gas well with a formation pressure below hydrostatic described in the method of development of gas wells under conditions of abnormally low formation pressure (see RF patent №2455477 dated 07.02.2011, publ. 10.07.2012), including the descent of the flexible tube into the internal cavity of the tubing to the bottom hole, the gas flow in the annulus of the borehole with the removal of killing fluid onto the ground surface. Descent flexible pipe is carried out by feeding into her foam system and stops every 50 to 100 m, which offers a flexible pipe high pressure gas. The gas flow in the annulus is performed upon reaching the flexible pipe of the downhole from a mobile compressor. At the same time in a flexible tube serves the high pressure gas from the booster installation. The removal of killing fluid carried by the annular space formed by the flexible tube and pump-compressor pipes.

The disadvantage of this method is the low efficiency of removal of killing fluid from the gas well with a formation pressure below hydrostatic. Supply pennisetum in a flexible tube, the displacement of the portions of killing fluid and foam system high pressure gas during stops involve a large consumption of gas. To increase the pressure of gas used compressor and booster installation, creating foam also requires additional equipment, which complicates the technological scheme for the removal of killing fluid and as a consequence increases the energy consumption. Upon reaching the flexible pipe downhole in the annulus remains fluid damping, gas produced booster installation, insufficient for its removal in the annulus serves gas from a mobile compressor that increases the gas flow. To remove killing fluid along the annular space also requires a large consumption of gas.

The closest is a method of removing killing fluid from the gas well with a formation pressure below hydrostatic described in the method of development of gas wells without a packer in the conditions of abnormally low formation pressure (see RF patent №2399756 dated 16.06.2009, publ. 20.09.2010), including the descent of the flexible tube into the internal cavity of the tubing to the bottom hole, the gas flow in the annulus of the borehole with the removal of killing fluid onto the ground surface. Descent flexible pipe is carried out by feeding into her Aer�levers of the foaming liquid (APOE) and stops every 50 to 100 m, while serving in a flexible tube high pressure gas. The gas flow in the annulus is carried out after the deepening of the flexible pipe at 200-300 m from the installation of complex gas. The removal of killing fluid carried by the annular space formed by the flexible tube and pump-compressor pipes.

The disadvantage of this method is the low efficiency of removal of killing fluid from the gas well with a formation pressure below hydrostatic. Before serving in the borehole gas komprimiert, cleaned, dosimat on booster installation, prepare aerated foaming liquid, which requires additional equipment and increases the energy consumption. Feed APOE in a flexible tube, the displacement of the portions of killing fluid and APO high pressure gas during stops requires a large consumption of gas. APOJ has a higher density than gas, which creates additional pressure on the face and may lead to the penetration of killing fluid into the reservoir. Gas flow in the annulus is possible only after the deepening of the flexible tube at 200-300 m, because the gas is supplied from the installation of complex gas, which creates additional back pressure on the formation. The removal of killing fluid along the annular space requires a large consumption of gas.

Technical results�the ATA is to increase the removal efficiency of killing fluid from the gas well with a formation pressure below hydrostatic through the continuous removal of killing fluid through a flexible tube, reduction of gas consumption and energy costs.

The technical result is achieved in that the lowering of the flexible pipe into the internal cavity of the tubing to the bottom hole, fed to the gas in the annulus of the borehole with the removal of killing fluid onto the ground surface.

What is new is that the gas flow in the annulus of the well is carried out with simultaneous flow of gas into the space between the flexible tube and pump-compressor pipes directly from the plume of the same wells. Moreover, the gas supply is carried out at achieving flexible tube liquid level killing. Descent flexible pipe is carried out continuously. The level of killing fluid to the bottom hole of the flexible pipe is lowered at a speed calculated by the formula

where wSP- the rate of descent flexible pipe, m/h;

Qgminimum required gas flow for the removal of killing fluid onto the ground surface, defined by the formula, m3/h

where K - coefficient of the sustainable removal mode of killing fluid, equal to 6·104;

d - inner diameter of the flexible tube, m;

Pg- the pressure of the gas supplied to the well is equal to the pressure in the plume, kgf/cm2;

NSLE- the depth of the borehole, m;

ρW.CH.- the raft�spine of killing fluid, kg/m3;

D - inner diameter of the casing M.

The removal of killing fluid is carried out through a flexible tube.

The figure presents a schematic flow diagram of a method of removal of killing fluid from the gas well with a formation pressure below hydrostatic.

After the overhaul of the well is filled with fluid damping. With a formation pressure below hydrostatic during the removal of the killing fluid is a high probability of its arrival into the reservoir, thereby impeding further development wells.

The inner cavity of pump-compressor pipes 1 (see Fig.) pull the flexible pipe 2 coiled tubing unit 3. As in the well formation pressure below hydrostatic, to prevent the increase of back pressure on the formation, the annulus bore 4 and into the space between the flexible tube and pump-compressor pipe 5 is fed gas from the loop 6 of the same wells. The gas flow is initiated when the achievement of a flexible tube liquid level killing. The gas supplied into the well, has a low density.

Gas flow into the well from loop 6 does not provide for the use of additional equipment needed to increase gas pressure, which reduces energy costs. Simultaneous supply of gas to these spaces provide�provides a uniform decrease in the level of killing fluid. To ensure a continuous lift of the gas-liquid mixture formed in the flexible pipe 2, on the surface calculate the minimum required gas flow rate according to the formula

where Qgminimum required gas flow for the removal of killing fluid onto the ground surface, m3/h;

K - coefficient of the sustainable removal mode of killing fluid, equal to 6·104;

d - inner diameter of the flexible tube, m;

Pg- the pressure of the gas supplied to the well is equal to the pressure in the plume, kgf/cm2.

Introduction to ratio formula sustainable deletion mode of killing fluid, allows to calculate the minimum required gas flow rate, providing the work in "reverse" when the rate of upward flow of gas-liquid mixture provides removal of killing fluid. The ratio is calculated taking into account the speed and gas design parameters of the flexible tube. The velocity of the gas is determined by the expressionvg=21,2PGm/S. the Minimum required gas flow rate isQg=360021,2 PG0,785d2Pg, m3/h. the Conversion formula above allows you to select a ratio and present the equation in the formQg=Kd2Pg0,5.

The use of low pressure gas from the plume and a small bore flexible tube 2 reduce the amount of gas consumption.

The gas provide through the flow meter 7.

Descent flexible pipe is carried out continuously. The level of killing fluid to the bottom hole of the flexible pipe is lowered at a speed calculated by the formula

where wSP- the rate of descent flexible pipe, m/h

Qgminimum required gas flow for the removal of killing fluid onto the ground surface, m3/h;

NSLE- the depth of the borehole, m;

ρW.CH.is the density of killing fluid, kg/m3;

D - inner diameter of the casing M.

The speed of descent of the flexible tube 2 should ensure the formation of a gas-liquid mixture density, the motion of which the flexible pipe 2 rubbed� pressure less than the pressure of supplied gas. Continuous descent flexible pipe to reduce the pressure on the bottom of a well.

The calculated rate of descent flexible pipe 2 and the minimum required gas flow rate determine the mode that provides continuous removal of the fluid damping. When reaching the flexible tube 2 of the downhole fluid damping will be removed completely. The removal of killing fluid is carried out through a flexible tube 2. Gas-liquid mixture is directed into a separator 8 for separating the gas and liquid phase. The liquid from separator 8 is collected in the tank 9 and disposed of. Gas from the separator 8 is directed to the flare unit.

The essence of the claimed method is illustrated by the following example.

In the gas well after the overhaul, the level of killing fluid density of 1000 kg/m3is 462 m. the Reservoir pressure of 42 kgf/cm2. The gas pressure in the plume wells 11 kgf/cm2. The inner diameter of the casing 0,206 M.

To remove killing fluid in tubing wells pull flexible pipe coiled tubing with an internal diameter of 0.03 m.

Calculate the minimum required gas flow for the removal of killing fluid onto the ground surface

where Qgminimum required gas flow for the removal of killing fluid at the bottom�ing surface, m3/h;

K - coefficient of the sustainable removal mode of killing fluid, equal to 6·104;

d - inner diameter of the flexible tube, m;

Pg- the pressure of the gas supplied to the well is equal to the pressure in the plume, kgf/cm2.

When reaching the flexible tube liquid level jamming with the calculated flow rate of supply gas from the plume wells simultaneously in the annulus of the well and into the space between the flexible tube and pump-compressor pipes.

The level of killing fluid to the bottom hole of the flexible pipe is lowered at a speed calculated by the formula

where wSP- the rate of descent flexible pipe, m/h

HSLE- the depth of the borehole, m;

ρW.CH.is the density of killing fluid, kg/m3;

D - inner diameter of the casing M.

Fluid damping is removed through a flexible tube continuously by the gas flow onto the ground surface. When reaching the flexible pipe of the downhole fluid choke is fully removed.

Gas-liquid mixture is directed into the separator where it is separated into gas and liquid phases, the liquid is collected in a container, and the gas sent to the flare.

The total time of removal of killing fluid were

Thus spent 680,58 m3gas, the method is implemented without the involvement of complement�form of further equipment to increase the pressure of the gas, in the process of the work flow of killing fluid into the reservoir is not fixed.

Method of removal of killing fluid from the gas well with a formation pressure below hydrostatic, including the descent of the flexible tube into the internal cavity of the tubing to the bottom hole, the gas flow in the annulus of the borehole with the removal of killing fluid onto the ground surface, characterized in that the gas flow in the annulus of the well is carried out with simultaneous flow of gas into the space between the flexible tube and pump-compressor pipes directly from the plume of the same bore, and the gas supply is carried out at achieving a flexible pipe to the level of killing fluid, and the descent of the flexible tube is carried out continuously, moreover, the level of killing fluid to the bottom hole of the flexible pipe is lowered at a speed calculated by the formula

where wSP- the rate of descent flexible pipe, m/h,
Qgminimum required gas flow for the removal of killing fluid onto the ground surface, defined by the formula, m3/h

where K - factor of sustainable deletion mode of killing fluid, equal to 6·104;
d - inner diameter of the flexible tube, m,
Pg- the pressure of the gas supplied to squa�inu, equal to the pressure in the plume, kgf/cm2
NSLE- the depth of the borehole, m;
ρW.CH.is the density of killing fluid, kg/m3;
D - inner diameter of the casing m,
note that deletion of killing fluid is carried out through a flexible tube.



 

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