SU945406A1 - Deep-well sampler - Google Patents

Description

(5) Borehole sampler

one

The invention relates to a field geophysical study in wells, namely, devices designed to take and seal deep fluid samples in wells.

Samplers are known that are classified according to the sign of filling the sample probe chamber. They are divided into samplers with a flow-through chamber and samplers with a non-flowing chamber.

 There are known samplers with a flow-through chamber, in which, when they are lowered into the well, fluid flow passes through the chamber with the valves open and at the depth of the valve sampling. are closed. So the design is relatively simple, since it is necessary to perform only one operation to close the valves in the absence of a pressure differential, which increases the reliability of their operation J.

However, when using these samplers, there is no guarantee that the same fluid is in the sampler chamber at a given depth as in the well at the sampling depth. In the process of lowering the sampler into the well, the viscous fluid may not be completely replaced in the chamber. Then the sample will be represented by a mixture of fluids entering the chamber at different depths.

The closest solution to the proposed one is a sampler that includes a body, a sampling chamber

15 chamber with separating piston and sealing valve, chamber filled with working fluid, drain chamber, channel with hydroresistance, connecting the last two chambers, glass and remote control valve installed in the channel with hydroresistance, the Glass is located concentrically on the box B O4

Claims (2)

With the possibility of an axial displacement fluid under pressure, relative to the latter and equal to the pressure in the well, it forms with it a chamber filled with a sampler working with the following working fluid. After the sampler is lowered, a remote control valve opens at the test interval and the working fluid fills the drain chamber, while the body of the sample receiving chamber slides down, sucking the well fluid in the sealing valve. At the end of the sampling, the remote control valve and the sealing valve are closed. However, this design does not provide a sampling of a high viscosity flushing fluid, and the presence of a valve sealing sample without forcibly closing reduces the reliability of sealing in these objects — an increase in the reliability of sampling and sealing of samples. This goal is achieved by the fact that the downhole sampler is equipped with a rod located in the sampling chamber and rigidly connected to the sealing valve, and the separating -JQ piston is located in the lower part of the sampling chamber and is freely seated on the rod, the upper part of which has a restrictive shoulder and is fixed relative to the case. Just than the sample chamber above the separation piston is filled with a working fluid and communicated with a channel with hydroresistance to the drain chamber. In this case, the sealing valve and the separation piston have equal working areas. FIG. Figure 1 shows the well sampler with the position of the nodes before sampling; Fig. 2 shows the position of the nodes after the end of the sampling. The sampler consists of a housing 1 in which a discharge chamber 2 with a remotely controlled valve 3 and a sampling chamber with a separating piston 5 are located, which is freely mounted on the stem 7 held by the retainer 6 with the sealing valve 8 fixed on it. The remote controlled valve contains a channel 9 with a sealed hole and an electric heater 10, and a probe-receiving chamber filled At the sampling depth, current is supplied to the electric heater 10 through the cable, valve 3 is heated and 11 solder in channel 9 is heated. ystviem working fluid pressure the solder is pushed out of the channel 9 and the separating piston 5 is moved to displace the working fluid in the drain chamber 2 and the releasing position in probopriemnoy chamber A for the sample. Separating: The piston 5, having reached the collar on the rod 7, moves the rod together with the sealing 4 valve 8, which is drawn into the sample chamber, acts as a bottom valve. The sampled sample is sealed between the separation piston 5 and the sealing valve 8 having the same working areas, which eliminates the spontaneous depressurization of the sample chamber C. The rod 7 is held with the help of the clamp 6. The discharge chamber 2 has a larger volume than the sample chamber, therefore the process of moving the working fluid pressure in it increases to 0.1-0.3 MPa and the force on the rod 7 from the side of the chamber 2 is negligible. In the proposed downhole sampler, there is a sealing valve with forced closure, and the sampled sample is sealed on both sides with valves having the same working area and interconnected. These conditions guarantee against spontaneous depressurization while lifting a well from a well and significantly increase the reliability of sampling and sealing of samples. Claim 1. A downhole sampler comprising a housing, a sampling chamber with a separation piston, a drain chamber, a channel with hydroresistance and a remotely controlled valve and a sealing valve, characterized in that in order to increase the reliability of sampling and sealing of the sample, it is equipped with a rod located in the sample chamber and rigidly connected to the sealing valve, and the separation piston is located in the lower part of the coffin chamber and is loosely seated on the rod, the upper part of which has limits The collar is fixed against the body, and the sampling chamber above the separation piston is filled with the working fluid and communicated with a hydraulic resistance channel to the discharge chamber. 45406. 6 2. A sampler according to claim 1, characterized in that the sealing valve and the separation piston have equal working areas. 5 Sources of information taken into account in the examination 1. USSR author's certificate number 692993, cl. E 21 HF9 / 08, 1977. 2. USSR author's certificate No. 785 75, class E21 8 49/02, 1979 (prototype)