Sampler of formation fluid

FIELD: oil-and-gas production.

SUBSTANCE: sampler, consisting of system of fluid sampling, includes sampling valve and storage of fluid sample, electrohydraulic system. Electrohydraulic system is implemented as logical for fixation and unlock of sampler in well, which includes electric motor, connected to pump, which is connected to the first distributor through return valve, with filter, with safety valve and with the second distributor, connected to valve of sampling and storage of fluid sample, and also to the first, to the second, to the third and to the fourth sensor - pressure limit switch, the first distributor is connected parallel to head end of the first hydraulic ram, of the second hydraulic ram and the third hydraulic ram, stocked cavities of which are connected to third distributors, hydraulic accumulator, to the fifth sensor - pressure limit switch and to the fourth distributor.

EFFECT: reliability enhancement of sampler operation, improvement of automation of sampling and extension of capabilities.

1 dwg

 

The invention relates to hydro-geological studies of wells and is designed for sampling of downhole fluid sample in the wells.

Famous sampler (patent RU โ„–2278259, IPC EV 49/08 from 20.06.2006 year), including hydromechanical system of sampling, which includes the actuator and accessories.

The disadvantages of this device is the lack of automated sampling system, as well as the absence of the possibility of sampling fluid from a formation in the well.

Famous sampler (patent RU โ„–2199009, IPC EV 49/00 from 20.02.2003 year), including a system of remote control processes is released, the flow of fluid pressure restoration in podvecerni or megaceros area and then automatically released.

The disadvantages of this sampler are the presence of the rubber elements, which carry out the unfixing of the sampler in the well and have a short life due to rapid wear of the material. The number of samples is limited in a single run, you can only get one sample of fluid, which limits the functionality of the sampler.

The closest in technical essence and the achieved result to the present invention is the sampler (patent RU โ„–2280160, EV 49/08, publ. 27.01.2006, containing an electro-hydraulic system and the system is the sampling fluid. Electro-hydraulic system includes a cylindrical chamber and the dispenser, and the sample fluid includes a valve selection and storage of the sample fluid.

The disadvantages of the prototype is the impossibility of fixing and released the sampler in the well and the impossibility of sampling fluid from a formation in the well.

The objective of the invention is to enhance reliability of operation of the sampler, improving automation of sampling through the use of logical electro-hydraulic system and expand the functionality due to the selection of high-quality samples of formation fluids in a single run of the sampler.

The problem is solved in that in the formation fluid sampler, consisting of a system of sampling of a fluid, comprising a valve selection and storage of the sample fluid, an electro-hydraulic system, the latter in contrast to the prototype made logical for locking and released the sampler in the well, which comprises an electric motor connected to the pump, which is connected with the first valve through the check valve, filter, pressure relief valve and a second valve connected to the valve selection and storage of the sample fluid, as well as with the first, second, third and fourth sensors, pressure switches. The first valve connecting ucen in parallel with the piston cavities of the first hydraulic cylinder, the second cylinder and the third cylinder, the rod end of which is connected with the third valve, the hydraulic accumulator with the fifth sensor, pressure switches and fourth dispenser.

Improving the reliability of the sampler is achieved using the first, second, third, and fourth control valves and hydraulic accumulator: in the absence of the control signal accumulator creates the necessary pressure of the working fluid in the first, second and third hydraulic cylinders for them is released into the transport position, ensuring trouble-free operation.

Improving automation of the process of sampling is achieved using sensors, pressure switches, the first, second, third, fourth and fifth, which control the first, second, third, fourth and fifth valves.

The invention is illustrated by the drawing, which shows a schematic hydraulic diagram of the formation fluid sampler.

The formation fluid sampler includes a motor 1 which is connected to the pump 2. The pump 2 is connected to the first valve 3 through the check valve 4, the filter 5, the safety valve 6 and the second valve 7. The second valve 7 is connected to the valve selection and storage of the sample fluid 8, and for the first 9 and second 10, the third is 11 and the fourth sensors, pressure switches 12. The first valve 3 is connected in parallel to the piston cavities of the first 13, second 14 and third hydraulic cylinders 15, the rod end of which is connected to the third valve 16, the hydraulic accumulator 17 to the fifth sensor is a pressure switch 18 and the fourth valve 19.

The proposed sampler works as follows: an electrical signal is supplied to the motor 1, operate the pump 2. The pump 2 has a working pressure in the system, controlled safety valve 5 and the fifth sensor is a pressure switch 18, and provides a specified flow rate of the working fluid is passed to the first valve piston 3 in the cavity of the first 13, second 14 and third 15 of the hydraulic cylinders and the hydraulic accumulator 17 through the third valve 16. Simultaneously with the first valve 3 is open fourth valve 19, which tells the rod end of the first 13, second 14 and third 15 of the hydraulic cylinders with the drain line. In the absence of the control signal of the first dispenser 3 reports the piston cavity of the first 13, second 14 and third 15 cylinders with a drain line, and rod - line hydraulic accumulator 17, which reverses the motion of the pistons of all the cylinders. In case of failure of the hydraulic accumulator 17, the first dispenser 3 reports the rod end of the first 13, the WTO is wow 14, the third 15 of the hydraulic cylinders with the pressure line and the piston with the drain line, which allows for the unfixing of the sampler in the presence of an electrical signal. When the extension of the piston of the third cylinder 15 actuates the second valve 7, which distributes the pressure of the working fluid in the right cavity of the valve selection and storage of the sample fluid 8, which is moving to the left, creates a pressure vacuum in the sampling system.

Thus, the claimed invention provides a high reliability of the sampler, automation of sampling through the use of logical electro-hydraulic system and the selection of the at least two high-quality samples of formation fluids in a single run of the sampler into the well. The advantage of the proposed formation fluid sampler is a high validity of the results due to the reliability of fixation and released the sampler in the well and high performance through the use of logical electro-hydraulic system.

The formation fluid sampler, consisting of a system of sampling of a fluid, comprising a valve selection and storage of the sample fluid, an electro-hydraulic system, characterized in that the electro-hydraulic system is made logical for locking and released the sampler in the well, which which includes the motor, connected to the pump, which is connected with the first valve through the check valve, filter, pressure relief valve and a second valve connected to the valve selection and storage of the sample fluid, as well as with the first, the second, the third and the fourth sensor is a pressure switch, a first valve connected in parallel with the piston cavities of the first cylinder, the second cylinder and the third cylinder, the rod end of which is connected to the third valve, the accumulator, the fifth sensor is a pressure switch and the fourth valve.



 

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