SU1698432A1 - Borehole fluid sampler - Google Patents

Abstract

The invention relates to a technique for sampling fluid mainly from wells and can also be used for sampling fluid from different depth levels of a reservoir. The goal is to make it possible to take several fluid samples in one trip. The device contains a rod 1 suspended on a cable suspension 3 with diaphragms (D) 4 and 5 mounted on it and additional D 6 and 7. The distance between D W fe from H) 00 00 th

Description

CHFN

F // g /

is adjusted by the lock nuts 8. The housing 9 is spring-loaded relative to the stem 1 by the spring 11. The device is lowered into the fluid at a given level. , With this sample

liquids are taken into the chamber and sealed. To take a second sample at another predetermined level, an additional load is sent, under the weight of which the body 9 is moved downwards by a distance between D 6 and 7, the sample compartment to another chamber. 1 hp f-ly, 2 ill.

The invention relates to a fluid sampling technique, preferably from wells, and can also be used for sampling water from different depth levels of a reservoir.

The purpose of the invention is to provide the possibility of taking several fluid samples in one single lifting operation.

FIG. 1 shows the device in the position of the descent into the well, a general view; in fig. 2 - the same in the sampling process: on the left part of the drawing when taking the first sample, on the right part when taking the second sample.

The fluid sampling device comprises a rod 1 with a guide cone 2, suspended on a rope suspension 3 of a lifting mechanism (not shown), and an upper and lower diaphragm mounted on the rod, made in the form of plugs 4 and 5. Between them, additional diaphragms 6 and 7. The lower plug 5 and diaphragms 6 and 7 are mounted on the rod 1 by means of a threaded connection with the possibility of movement relative to the stem 1 of fixing by the lock nuts 8.

A cylindrical housing 9 with overflow openings 10 in the upper part is placed on the upper guide plug 4. A compression spring 11 is installed between the upper stopper 4 and the housing 9. The kit includes a messenger load 12 and an additional messenger load 13, Stoppers 4 and 5, as well as diaphragms 6 and 7 on the cylindrical surfaces have sealing rings to seal the joints with housing 9.

Before the device is lowered into the well, the weight of the messenger loads 12 and 13 is selected. The weight of the first messenger load 12 is chosen so that when it interacts with the body 9 in the liquid, the upper guide plug (upper diaphragm) 4 is in the lower part of the body 4. Weight Pn of the next messenger

cargo is chosen from the following ratio

-hn p o, n - yy g to 2j n - 1

TO

where hn is a one-time movement of body 9 relative to stem 1, equal to the distance between adjacent diaphragms, m; K - spring stiffness 11, N / m; Pk body weight 9

in liquid

P

and.-

Rl-1 - total weight in

fluid messenger cargo, interacting with the housing 9, N.

Fluid sampler

work as follows.

On the cable suspension 3, the device is lowered to a predetermined level of fluid in the well from which it is necessary to select

the sample, while the spring 11 is pre-compressed by the weight of the body 9, the lower end of which is below the upper plug-4 (Fig. 1). To take the first sample of the cable suspension 3, the wellhead is lowered

the first messenger load 12 which its

weighing compresses the spring 11 and moves

housing 9 down, with the spring stroke 11 under

the action of the weight of the load 12 in the fluid is equal to

the distance between the upper stopper 4 and the diaphragm 6. Thus, after sending the load 12, a sealed chamber 14 is formed in which the fluid is isolated from the level at which the sample was taken.

To take a second sample, the device is moved down (or up) to a new level and an additional messenger load 13 is sent from the wellhead (see the right-hand part in Fig. 2), under the weight of which the spring 11 continues to compress and the body 9

move down. A chamber 15 is formed between the diaphragms 6 and 7 with the sample taken from the second predetermined level.

When sending a third cargo (not shown), the sample is taken into the cavity formed by the diaphragm 7 and the lower plug 5.

When selecting fluids of different specific gravity, for example, from wells with clean water and wells with clay flushing solution of spring sludge 11, under the action of weights 12 and 13 will also be different in magnitude. Therefore, in order to guarantee overlap of each of the sampler chambers, adjust the distance between the upper stopper 4 and the diaphragm 6, between the diaphragms 6 and 7, and so on. The ability to adjust the distance between the plugs and the diaphragms allows for the use of non-springed springs in the device, and the distance is determined empirically depending on the weight of the messenger loads.

Claims (2)

Claim 1. Device for collecting fluid from a well, including a rod with an upper and lower diaphragm made in the form of plugs suspended on a cable suspension, a body with a cylindrical shape mounted on the outer side of the diaphragm with the possibility of longitudinal movement when interacting with a messenger load taken away in order to enable the sampling of several fluid samples in a single lifting operation, it is equipped with additional diaphragms installed on the rod between the upper and lower diaphragms and additional messenger loads, the body being spring-loaded relative to the rod, and the weight of the next messenger load is chosen from the ratio Pp-Pk-2 Pp-1. 141 where Pn is the weight in the fluid of the next messenger load, N; hH - one-time movement of the body relative to the stem, equal to the distance between adjacent diaphragms, m; K - spring stiffness N / m; Rk - weight corpus sa in liquid, H; Pn-i - total weight in fluid messenger cargo, interacting with the body, N. 2. The device according to claim 1, wherein the additional diaphragms are mounted on the stem with the possibility of movement and fixation relative to the latter.