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Method for electro-thermal treatment of face-adjacent bed zone

IPC classes for russian patent Method for electro-thermal treatment of face-adjacent bed zone (RU 2247233):

E21B43/24 - using heat, e.g. steam injection (heating, cooling or insulating wells E21B0036000000)

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FIELD: oil and gas extractive industry.

SUBSTANCE: face-adjacent bed zone is heated by well electric heater and liquid is removed. Well is equipped with column of tubing pipes with perforated branch pipe at the end, separated by plug, with electric heater and pump below the plug. Branch pipe is positioned in zone of productive bed. Flow of liquid along inter-tubular space is limited by partial disengagement of inter-tubular well space at level of productive bed ceiling. Face-adjacent zone is heated with concurrent circulation of liquid along branch pipe below the cork and well space below disengagement location and feeding of water into inter-tubular space. Removal of liquid is performed with disabled heating and circulation of liquid.

EFFECT: higher efficiency.

1 ex, 1 dwg

The invention relates to the oil industry and can be used during well operation with the intensification of oil when the electrothermal treatment of bottom-hole zone of the reservoir.

The known method of stationary electro-thermal processing bottom-hole formation zone, namely, that in the well in the interval of the reservoir below the pumping equipment installed stationary heater and carry out the heating of the reservoir during operation continuously or at pre-set mode [Reference book on oil production. Edited Chickentuna, M.: Nedra, 1974].

Due to the entrainment heat flux extracted oil known method does not allow to warm up the bottomhole formation zone sufficiently to melt the paraffin and resin deposits.

Closest to the invention to the technical essence is a method of thermal elimination of paraffin and resin deposits with subsequent impacts on the bottomhole zone Neftegazgeodeziya layer. The method involves the injection of solution into the bottom zone Neftegazgeodeziya layer. Next heat up Neftegazstroy the reservoir and pumped into the bottom zone Neftegazgeodeziya reservoir solution. Periodically lower the downhole heater below warmed Neftegazgeodeziya layer and then raise the downhole heater warmed above Neftegazgeodeziya layer on the distance, the selected ratio of 0.68-3,27 thickness warmed Neftegazgeodeziya layer. The periodicity of the movements of the heater up and down from 2 to 12 per minute at equal or unequal intervals or continuously. After thermal elimination of paraffin and resin deposits Neftegazgeodeziya formation and the subsequent beginning of the selection of oil well heater left in the area Neftegazgeodeziya layer. Not stopping the heating of the bottom zone Neftegazgeodeziya reservoir, serves on the downhole heater AC current at periodic or continuous movements up and down. Additionally affect the bottomhole zone Neftegazgeodeziya formation constant current. The positive charge DC serves on placed under or above the downhole electric heater auxiliary electrode. The negative charge constant current is fed to the ground. An additional electrode is moved along Neftegazgeodeziya reservoir up and down together with downhole electric heater. Additional impact on the bottom zone Neftegazgeodeziya reservoir provide DC voltage 150-800 In at an amperage of 10-500 A. improving the efficiency of the removal of paraffin and resin deposits, prevents their possible education in the area neftegazkadry the corresponding layer, and liquidated water cone bottom zone Neftegazgeodeziya layer with a simultaneous increase in performance selection of oil and gas (Patent RF №2204699, CL E 21 In 43/24, publ. 20.05.2003 - prototype).

Calculations show that a significant portion of heat by convection is carried away from the bottom zone in the upper part of the borehole. Since the conductivity of water is on average 4 times higher thermal conductivity of oil, the conditions of heat transfer deteriorates. In addition, in the known method, using thermocyclic treatment of bottom-hole formation zone, which consists in changing the warm-up period without selection of the liquid during the liquid extraction without heating, by changing the sampling period on the warm-up period, due to the fact that the reservoir receives fluid (as its level in the well below static), part of the heat from the heater, blown away by the fluid and is not transmitted to the reservoir. Thus, in the known method the efficiency of the heat treatment of bottom-hole formation zone insignificant as the majority of the allocated electric heater heat is carried away to be extracted from the reservoir fluid.

The invention solves the problem of increasing the efficiency of heating of the bottom-hole formation zone by minimizing heat loss up the wellbore, increasing the temperature of heating on the bottom of SLE is new well, increasing the penetration due to the filtering of warm water into the reservoir and reduce losses on oil production by reducing downtime wells for heating the reservoir.

The task is solved in that in the method of the electrothermal processing bottom-hole formation zone, including warming of the bottom-hole formation zone downhole electric heater and the fluid extraction according to the invention is well equipped column tubing placed at the end of the perforated pipe, separated by a tube, heater and pump below the tube, the tube is placed in the zone of the reservoir, limiting the flow of fluid through the annular space partial separation of the annulus of the well at the level of the roof of the reservoir, heated bottom zone with simultaneous circulation of liquid in the pipe below the tube and borehole space below the dissociation and topping the water in the annular space, and the selection of liquid lead when the warm-up and liquid circulation.

Features of the invention are:

1. warming of the bottom-hole formation zone downhole electric heater;

2. the liquid extraction;

3. the equipment of the well casing tubing;

4. the same placed on the end of the perforated Pat is the UBK;

5. the same split tube;

6. same with the heater and the pump below cork;

7. the placement of the pipe in the zone of the formation;

8. limiting the flow of fluid through the annular space partial separation of the annulus of the well at the level of the roof of the formation;

9. warming of the bottom zone with simultaneous circulation of liquid in the pipe below the tube and borehole space below the dissociation;

10. same with topping of water in the annulus;

11. the selection of the liquid when the warm-up and liquid circulation.

Signs 1 and 2 are shared with the prototype, signs 3-11 are the salient features of the invention.

The invention

Electrothermal treatment of bottom-hole zone of the reservoir is designed to melt and remove paraffin and wax deposits, to improve the filtration properties of rocks composing the oil reservoir and lowering the viscosity of the reservoir oil.

Warming of the bottom zone downhole heaters contributes to the melting of paraffin and resin deposits and increase the permeability zone, the reduction of oil viscosity and improving its fluidity. However, existing methods of heating up inefficient due to losses of heat is up the wellbore, low temperature annealing on the bottom hole, a small penetration due to filtering the heated water into the reservoir, power loss and loss of oil production as a result of idle wells for heating the reservoir. In the proposed method solves the problem of increasing the efficiency of heating of the bottom-hole formation zone by reducing the above-mentioned negative factors. The problem is solved as follows.

When the electrothermal processing bottom-hole formation zone are warming up bottom-hole formation zone downhole electric heater and take the liquid from the wells. Well equipped column tubing placed at the end of a perforated pipe, a split tube. On the pipe below the tube place the heater and the pump. The pipe is placed in the zone of the reservoir. Restrict the flow of fluid through the annular space partial separation of the annulus of the well at the roof level of the productive formation by the production of a cap. Warm up the bottom zone with simultaneous circulation of liquid in the pipe below the tube and borehole space below the dissociation. This heats the water in the annulus at the wellhead. The selection of liquid lead when the warm-up and liquid circulation.

the drawing shows a diagram of the proposed method.

In the well on the tubing pipe 1 lower pump 2, a heater 3, a nozzle 4 with radial holes 5 and the insulating tube 6, the insulating cap 7, sucker rod pump 8 with the rod 9. For the supply of electricity to the electric heater 3 and the pump 2 along the column tubing 1 attach the cable 10. The oil is filtered into the well through the perforations 11 well 12. The wellhead is equipped line 13 with the valve 14.

Insulating cap 7 is used for dissociation (separation) of the heated portion of the formation from the upper part of the borehole. Insulating cap 7, the nozzle 4 with the radial holes 5 and the insulating tube 6 is placed on the roof of the reservoir. The heater 3 with the necessary power post below. The pump 2 with the calculated performance set below the soles of the layer.

The way of the electrothermal bottomhole zone treatment is carried out as follows. After carrying out servicing fluid in the well is set at a static level. In the lower part of the water is the result of plugging the well, which occurs before the rise of the column tubing and sucker rod pump.

For the implementation of the electrothermal processing bottom-hole formation zone in on the ale included the electric heater 3 and the pump 2. Pump 2 takes the liquid from the wells, pumps through the pipe 4 and the radial holes 5 again into the well, creating a circulation of liquid around the heater 3. The liquid is heated and transfers heat to the surrounding borehole space. Bottomhole formation zone is heated. The electric heater 3 and the pump 2 operate time t_CR.

After that, the electric heater 3 and the pump 2 disable and select the liquid sucker rod pump 8.

The selection process continues with a period of t_d.

After sucker rod pump 8 has worked for time t_dopen the valve 14 and fill the annulus with water to the required level. Simultaneously the pump 2 and the heater 3 heating time t_CR.

The process is repeated as many times as necessary.

Thanks to the invention significantly increases the efficiency of heating of the bottom-hole formation zone, due to the fact that the annular space is filled with water, thermal conductivity is much higher than thermal conductivity of oil, and heat from the electric heater penetrates deep into the productive formation at a great distance.

Much improved heat transfer in the borehole while circulating the fluid in the bottomhole formation zone, as it will increase its surface. It reaches the surface of the cylinder, the which begins insulating cap and ends borehole bottom. These activities contribute to the increase in well production, because the heated area is cleared of paraffin and asphalt-resinous deposits and decreases the viscosity of the oil in the wellbore area. All this facilitates the flow of oil to the bottom of the borehole and increases the rate of oil flow to the sucker rod pump. Calculations show that the amount of heat coming into the reservoir under the proposed method, three times more than the prototype.

Specific example

When the electrothermal processing bottom-hole formation zone in the interval 856-891 m are warming up bottom-hole formation zone downhole electric heater brand MEN-122 and the fluid extraction sucker rod pump brand NEW. Well equipped column tubing with accommodation at the end of a perforated pipe with a diameter of 73 mm and a length of 20 m, divided in the middle stopper height 500 mm of steel ST-3, with heater and pump brand WEDN below the tube. The pipe is placed in the zone of the reservoir. Restrict the flow of fluid through the annular space partial separation of the annulus of the well at the roof level of the productive formation staging insulating cap height 100 mm of rubber, is installed with a gap of 2 mm from the borehole wall. Include pump WEDN and heater, carry out adlib water in the annulus until the liquid level in the well 500 m and is heated bottom zone with simultaneous circulation of liquid in the pipe below the tube and borehole space below the dissociation. Warm-up time is 72 hours. Turn off the pump WEDN and electric heater and a selected liquid sucker rod pump for 480 hours.

In consequence, due to minimize heat loss up the wellbore, increasing the temperature of heating on the bottom hole, increasing the penetration due to the filtering of warm water into the reservoir and reduce losses on oil production by reducing downtime wells for heating the productive formation increases the efficiency of heating of the bottom-hole formation zone.

The application of the proposed method will improve the efficiency of the electrothermal processing bottom-hole formation zone.

The way electrothermal processing bottom-hole formation zone, including warming of the bottom-hole formation zone downhole electric heater and the selection of the fluid, wherein the well equipped column tubing placed at the end of the perforated pipe, separated by a tube, heater and pump below the tube, the tube is placed in the zone of the reservoir, limiting the flow of fluid through the annular space partial separation of the annulus of the well at the level of the roof of the reservoir, heated bottom zone with simultaneous circulation of liquid through the pipe the lower the tube and borehole space below the dissociation and topping the water in the annular space, and the selection of the liquid lead when the warm-up and liquid circulation.