Method of evaluation of static and dynamic levels of fluid in annular space of well equipped with electric centrifugal pump

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil industry and can be implemented at survey of wells. The method of evaluation of static and dynamic levels of fluid in annular space of a well equipped with an electric centrifugal pump includes evaluating of levels by geo-physic methods. Prior to evaluation of levels a hole is made in a face plate. A perforated plastic pipe narrowed in its lower part and secured on external surface of a flow string is lowered together with the flow string and the pump into the well. Bottom of the plastic pipe is arranged 0.5-1.0 m above the pump; an upper end of the plastic pipe comes out to surface through the hole in the face plate. A gap between the plastic pipe and the hole of the face plate is leak proofed; a measuring tape with a level sensor is lowered inside the plastic pipe. Surface of fluid is contacted; a level is measured and the measuring tape is withdrawn out of the plastic pipe.

EFFECT: simplification of measuring procedure of fluid level.

 

The invention relates to the oil industry and can find application in the study wells.

There is a method of determining the level in the tubes rising through the formation tester for testing (test) wells, which contains measurement Shabnam meter subcritical gas flow, stopwatch, barometer-aneroid flow of air from the pipes and the absolute initial pressure (mm water. Art.), closing washers and timing of rise of pressure in the pipes to the final value. By calculating the change in volume of the empty tubes as the product of the air flow at the time of closure washers, according to the law of Boyle-Mariott determine the initial volume of empty tubes, dividing that their specific volume, determine the level in the pipe (patent RF №2104395, published. 1998.02.10).

The known method is inaccurate due to the indirect determination of level.

The closest to the proposed invention the technical essence is a method of determining the static and dynamic levels of fluid in the casing annulus of an oil well equipped with a centrifugal pump, comprising determining levels of geophysical methods for measurements of gamma-gamma density meter scattering and highly sensitive thermometer in the period of operation of electrical submersible pump. Before starting electr the centrifugal pump to produce additional background measuring gamma-gamma density meter scattering, compare this measurement with the measurement when determining levels during operation of the centrifugal pump and the results of the readings conclude about the presence of oil or oil-and-gas-foam in the range of obtained differences or lack of oil or oil-and-gas-foam in the absence of discrepancies in the testimony (the application for the invention of the Russian Federation No. 2004125694, published. 2006.02.10 - prototype).

The method also provides for the indirect determination of the level and requires the use of high-precision instruments indirect measurement type thermometry, the method is complex, multistage.

In the proposed invention solves the problem of direct determination of fluid level in the well, streamline operations.

The task is solved in that in the method of determining the static and dynamic levels of fluid in the casing annulus of a well equipped with an electric centrifugal pump, comprising determining levels of geophysical methods according to the invention prior to determination of the levels in the faceplate perform the hole at the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, the bottom of the plastic pipe set at 0.5-1.0 m above the pump, the upper end of the plastic pipe its output to the surface through the opening in the plate, seal the gap between the plastic pipe and hole faceplate, inside the plastic pipe down measuring tape with level sensor in contact with the surface of the liquid, measuring the level and remove the measuring tape from the plastic pipe. Features of the invention are:

1) determination of the levels geophysical methods;

2) implementation of the holes in the faceplate;

3) when you run a string of tubing from the pump together with the column descent perforated plastic pipe, securing it to the outer surface of the column;

4) plastic pipe with a constriction in the lower part;

5) the bottom of the plastic pipe is installed at 0.5-1.0 m above the pump;

6) conclusion the upper end of the plastic pipe to the surface through the hole in the faceplate;

7) seal the gap between the plastic pipe and hole faceplate;

8) the descent inside the plastic tube measuring tape with level gauge;

9) contacting the surface of the liquid;

10) measurement level;

11) removing the measuring tape from the plastic pipe.

The sign 1 is common with the prototype, signs 2-11 are the salient features of the invention.

The invention

Existing methods for measuring the level of fluids in the well are indirect or do not provide sufficient accuracy measured the I, how complex multistage. In the proposed method solves the problem of direct determination of fluid level in the borehole, simplify operations, the problem is solved as follows.

Before defining levels in the faceplate perform the hole. During the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, for example, straps, clamps, etc. the Bottom of the plastic pipe set at 0.5-1.0 m above the pump. The upper end of the plastic pipe its output to the surface through the hole in the faceplate. Seal the gap between the plastic pipe and hole faceplate, for example, paint sealants, entering the inner expanding ring, etc. Inside the plastic pipe down measuring tape with level sensor in contact with the surface of the liquid, measuring the level and remove the measuring tape from the plastic pipe.

For padding the dynamic level it is necessary that the well was in operation. For padding the static level you want the hole was easy. Thanks perforation, i.e. drilled holes in the plastic pipe, filling the pipe fluid is faster than the time required for recovery or decline. The poet is in the study could not take into account the time of filling or time release from liquid plastic pipe.

As the plastic pipe may be used polyethylene, polypropylene, PVC, PTFE pipe, or tube made of other thermoplastic polymers, and their copolymers.

Descent measuring tape outside of the plastic pipe leads to obvineniju column tubing and cable on it and it is impossible to advance the tape down, or up.

Install the bottom of the plastic pipe at 0.5-1.0 m above the pump promotes complete coverage of all possible changes of level in the well.

The diameter of the weight measuring tape is 14-16 mm, a Sufficient inner diameter of the plastic pipe 18-20 mm. For fast filling the plastic tube with liquid in it, drill the holes with a diameter of 7-9 mm every 1-2 meters To avoid falling weight with ribbon in the hole when you tape the bottom of the pipe should have a narrowing or may be partially extinguished. Specific example

Spend the definition of the static liquid level in the annular space of wells equipped with electric centrifugal pump. The inner diameter of the casing is 154 mm, an Outer diameter of the column tubing is 73 mm Centrifugal pump brand ACNW 5-8-100 should be placed at a depth of 70 meters

Before defining levels in the faceplate in the discharging hole diameter 30 mm During the descent of the column tubing with the pump together with a column down the cable to power the pump and perforated plastic pipe made of polyethylene with an inner diameter of 20 mm, a wall thickness of 2.5 mm and a narrowing in the lower parts up to a diameter of 8 mm Plastic pipe is equipped with a 8 mm-diameter holes every 1.5 m Reinforce plastic pipe every 2 m on the outer surface of the column straps. The bottom of the plastic pipe set at 0.7 m above the pump. The upper end of the plastic pipe its output to the surface through the hole in the faceplate. Seal the gap between the plastic pipe and hole faceplate filled with sealant. Inside the plastic tube down measuring tape lektromagnitnogo sensor type UIC-TE with the electrode and sinker. When fixing water level in the well on the built-in sensor electronic unit appears sound and light signals. Contact with the liquid surface, measure the level and remove the measuring tape from the plastic pipe. Determine that the static fluid level in the well is at a depth of 40,85 m

Run well. Supply power cable for electrical submersible pump and pumped from the well water for 2 days. Inside the plastic tube down measuring tape contact surface is part of the fluid, measure level and remove the measuring tape from the plastic pipe. Determine that the dynamic fluid level in the well is at a depth of 58,12 m

This is a direct way to determine with high accuracy static and dynamic fluid level in the well.

The application of the proposed method will allow to solve the problem of direct determination of fluid level in the borehole and to simplify operations on the measurement. The proposal also allows you to keep accurate monitoring of freshwater, including drinking water when used in the national economy.

The method of determining the static and dynamic levels of fluid in the casing annulus of a well equipped with an electric centrifugal pump, comprising determining levels geophysical methods, wherein before determining the levels in the faceplate perform the hole at the descent of the column tubing with the pump together with the column lower perforated plastic pipe with a constriction at the bottom, securing it to the outer surface of the column, the bottom of the plastic pipe set at 0.5-1.0 m above the pump, the upper end of the plastic pipe its output to the surface through the opening in the faceplate, seal the gap between the plastic pipe and hole faceplate, inside the plastic pipe down the Deputy is strong tape with a level sensor, contact with the liquid surface, measure the level and remove the measuring tape from the plastic pipe.



 

Same patents:

FIELD: oil industry.

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8 cl, 1 dwg

FIELD: physics, measurement.

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Depth correction // 2319002

FIELD: survey of boreholes or wells, particularly measuring depth or liquid level, namely equipment to measure depth of cable-suspended assembly location inside well.

SUBSTANCE: method involves determining length of cable lowered in well from ground surface; dividing cable length into several sections, wherein each section is set as member with effectively constant tension; determining tension in each cable section in well, cable extension for predetermined tension of all sections; determining assembly location depth from cable length lowered in well from ground surface and from cable extension inside well.

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9 cl, 1 tbl, 4 dwg

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15 cl, 6 dwg

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FIELD: well research, possible use for determining and controlling static and dynamic oil level in product wells.

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5 dwg, 3 tbl

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4 cl, 2 dwg, 1 tbl

FIELD: survey in boreholes or well, particularly for measuring depth or liquid level.

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FIELD: oil and gas industry.

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2 dwg

FIELD: oil and gas industry.

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5 dwg

FIELD: oil and gas industry.

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5 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to well survey and can be used for borehole cable (BC) geophysical instruments (GI) moving-in to boreholes of inclination angle exceeding 50 degrees. Shielding container fixed on the end of drill column (DC) containing number of drill pipes with upper and lower sectors of DC is lowered. GI is lowered on BC into the borehole. Herewith after drilling to preset depth is complete, DC is lifted to the beginning of intensive borehole crookedness. Upper pipe is disassembled, while lower pipe contains mounted lower module with provided GI with packer neck. Upper pipe is mounted on lower module thereafter lowered to preset depth. GI running is performed on one-piece BC. After running is complete, upper module is mounted above upper pipe of DC. Modules are designed as pipes widened to lateral part of casing pipe thus providing free passage for BC between upper pipe of DC and casing pipe. The shielding container represents a magnetic trap of internal boom drift diameter greater than that of DC, and consists of the case. Lower side face of the case contains a magnet, while lower end side includes wash wire guard.

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2 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to directed drilling equipment, namely to measuring equipment retentions in hermetic enclosure of electronic module of downhole device. The offered electronic module of downhole device contains the enclosure cross-armed in electric divider, radiator with upper end face containing electrical connection to generator, dampers between which there is chassis mounted with electronic components and inclinometer sensors peripheral deposition proof, plug fitting hermetically closing the enclosure from below. Herewith the lower damper contains the puller axially moving in rebore of the plug fitting and radial motion proof by pins. Axial position of the puller is regulated by the screw coaxial to the plug fitting in the hole formed wherein. The hole in the plug fitting is stepped with threaded and cylindrical segments. Cylindrical segment of the hole and the screw are sealed from each other with sealing rings. Threaded segment of the screw is of greater diameter, than cylindrical, and on its end face it contains screwdriver slot from the cylindrical segment. The lower and upper dampers are radial motion proof on the chassis by the pin. The plug fitting is provided with collar over which the plug fitting is pressed to the enclosure end face of the electronic module with sleeve nut.

EFFECT: higher efficiency and reliability of measuring equipment performance and higher overall damper performance due to reduced vibrations ensured by axial fix force control of the enclosure chassis.

12 cl, 3 dwg

FIELD: mining.

SUBSTANCE: facility includes pipe column, pump, packer and subsurface instrument. According to the invention a facility additionally contains a sleeve communicated with the pipe column; the said sleeve is designed with a side aperture located above the packer and under the pump. In the side aperture of the sleeve there is a pipe installed pressure tight; this pipe is installed with its one end inside the sleeve, while with another - outside the sleeve. The pipe ends are made with thread for cable points. The cable points CP-28 are screwed on the pipe ends. A logging cable is secured on the exterior surface of the pipe column. At the top the logging cable is connected with a secondary instrument, while at the bottom it is connected with the cable point CP-28 on the pipe outside the sleeve. Pressure tight cable points CP-28 are connected with a stub cable inside the pipe. On the pipe inside the sleeve the cable point CP-28 is connected with the stub cable of the logging cable, which below is connected with the subsurface instrument, located in the flow of liquid out of a lower bed.

EFFECT: upgraded reliability and efficiency of characterisation of lower bed at simultaneous-separate operation of beds in well.

1 dwg

FIELD: oil and gas production, particularly gas well logging.

SUBSTANCE: device comprises hollow cylindrical body with geared-down electric drive installed in it. Electric drive has tightened drive shaft and electronic circuit. Fluid-tight partitioning bush is arranged in body between electric drive and electronic circuit. The partitioning bush has orifice, which connects electric drive interior with ambient space. Two check valves are arranged inside the orifice. One check valve may be opened by excessive ambient pressure. Another one may be opened under the action of internal excessive pressure.

EFFECT: increased reliability of logging instrument operation due to possibility to compensate pressure applied to output shaft of instruments and elimination of electronic control circuit damage in the case of shaft tightness failure.

1 dwg

FIELD: survey of oil and gas boreholes or wells, namely locating fluid leaks, intrusions, or movements.

SUBSTANCE: pickup probe comprises main body, down-directed lever and up-directed lever. At least one lever has measuring means secured thereto and adapted to determine well fluid characteristics. Down-directed and up-directed levers are connected with main body by means of the first and the second sliding rotary links correspondingly, as well as with the first and the second ends of pressing shoe through the first and the second rotary links correspondingly.

EFFECT: possibility to pass through restricted sections and other obstacles, which interfere in measuring channel throat.

12 cl, 9 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.

EFFECT: higher efficiency.

3 cl, 1 dwg, 1 tbl

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