SU1239299A1 - Deep-well sampler - Google Patents

Description

The invention relates to field and geophysical studies, in particular, to instruments intended for the selection of deep-seated nobro fluids in wells.

The purpose of the invention is to increase the reliability of work.

FIG. I shows the downhole sampler, the original position; in fig. 2 - - sampler, in the process of sampling in

nerve probe chamber; pa f.ig. 3

the same, in the second chamber.

The downhole sampler consists of body 1 (Fig. 1), two sample-receiving chambers 2 and 3 of non-current type with separating pistons 4 and 5, QJTOKaMH 6 and 7 rigidly fixed on plugs 8 and 9. Drain chamber 10 is vacuum or filled with air below atmospheric pressure and communicated through controlled valves 11 and 12 with pilindars A and, 5 additional chambers in which differential pistons 13 and 14 are located. Small cylinders up to 11 °; 1 capacitance chambers can be communicated by bypass channels C and D with a drain chamber with channel receiving chambers. mi d and with the indicators 15 and 16 of pressure which are connected with the registrar kabele.m Geophysical Laboratory. Controllable valves 1-1 and 12 irivo. mc in action by electromagnets 17 and 18.

Ck important and nn s and f I robobortn and k works as follows.

Before lowering the sampler into the well, the sampling and additional chambers are filled with working fluid. When descending into the well, the pressure in the channels D and E is equal to hydrostatic pressure, and in cylinders A and B it is 3-4 times. The plug 8 is compatible with the robotic receiver chamber 3, and the plug 9 in the process of lowering the sampling probe jiri sampling of its 11th chambers, and the electromagnets 17 and 18 of the receiver.

Upon reaching the depth where it is necessary to take a sample (Fig. 2), e. 1MAG 18 opens KJiai iaii 12, together with cylinder B with camera 10 sleer, a. The action, m, of the differential pressure nopi / ieiib 14 is measured in

cylinder B to connect the channel E with the chamber 10 drain. After that, the working fluid from the sampling chamber 2 through the piston 4 is displaced through the bypass channel into the chamber 10, the valve 12 min, which makes it possible to close it by de-energizing the electromagnet immediately after the communication of the channel E with the discharge chamber 10, without exposing the valve high-speed flow, and electromagnet - high-temperature air.

As the piston 4 moves, the camera

2 is filled with fluid from the wellbore and a sample is taken from a given depth. At the end of the working stroke, the pistol 4, by means of a hollow rod rigidly connected with the plug 8, pulls the plug 8 into chamber 2, and the sampled sample is sealed: in chamber 2 between the piston 4 and plug K). Working fluid pressure

piston 4 is reduced to a value close to atmospheric pressure, which is registered by means of pressure indicator 15. After checking the sampling, the sampler is moved to the next interval to take a second sample. Here, using an electromagnet 17 (Fig. 3), valve 1 1 is opened and the working fluid from cylinder A flows into the discharge chamber 10. After the differential port 13pn in qi., A is entered, and channel D is coincided with the discharge chamber, the working fluid from chamber 3 of the test receiver flows into discharge chamber 0, valve I passes. As the pistons 5 move

3 is filled with fluid from the wellbore. After the piston 5 comes into contact with the increased diameter

part of HJTOKa 7. rigidly connected to cork 9, the latter is drawn into chamber 2 and hermetically marks the selected sample. The selection process of the city is monitored by the recorded indications of the pressure indicator 16. The discharge chamber 10 has a volume that is 1.2 - .5 times the working volume of the overpressure of the vacuum pump. 1 in ((amsre 10 cj HBa does not exceed 0.3 MPa.

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Claims (1)

A Borehole Sampler, comprising a housing, a sampling chamber filled with a working fluid and communicating with the external environment through a dividing piston, freely mounted on the rod, which is rigidly fixed by one side to the sealing plug and the other is fixed in the housing, a drain chamber and a remote-controlled valve, characterized in . what. in order to increase the reliability of operation, it is equipped with an additional chamber with a differential piston, a large stage of which is communicated through a controlled valve with a drain chamber, the additional chamber being filled with a working fluid, and the differential piston installed with the possibility of communication of the sampling and drain chambers through its small stage and bypass channel made in the housing. ё fo ph so ke so