SU1444510A1 - Sampler - Google Patents

Abstract

The invention relates to the field of well testing, namely, devices for taking deep-seated samples of liquid and gas dissolved in it. The goal is to improve the quality of the sampled sample. The sampler includes body 1 with a sampling chamber (POC) 6 of flow through type with upper and lower valves (K) 7, 8. Connected to K 7, 8 through rods 9, 10 with valve lock In the upper part housing 1 is placed locking mechanism that interacts with the stem K 7. In the POC 6 with possibly G I

Description

: g:

4 cl

By axial movement, a separation piston (RP) 1A is placed with an axial channel 15 and a bore 16 in the upper end surface. In the latter, K 17 is installed with an axial bore and seals on the outer and inner cylindrical surfaces. The gap between RP 1A and the walls of the VOC 6 is sealed with seals. The stem 10 of the lower K 8 is placed with a gap in the axial channel of the RP 14 and is hermetically mounted in the hole K 17. The sampler is lowered on the cable into the well with open K 7, 8 and 17 and kept at a certain depth until the depth sample enters POC 6, After actuation of the locking mechanism is released associated with them the rod K 7, which under the action of the spring 12 is pressed against the seat. The valve lock 11 is released and K 8 is pressed to the seat. In doing so, the K 17 returns to its bore 16 and is sealed. The depth sample is cut off at the sampler, and the RP 1D divides the sampler into two chambers. Then, the sampler retrieves the well and 9 dilutes it / carbonates it. The presence of RP 14 allows you to take a deep-seated sample with true reservoir pressure. This allows

do not get a reliable characteristic

stork fluid. 2 Il.

one

 The invention relates to the study of wells, and in particular to devices for taking deep-seated samples of liquid and gas dissolved in it.

The aim of the invention is to improve the quality of the sample being taken.

Yafig. 1 shows the sampler in the ascent position after sampling, general view; in fig. 2 — sampler opening unit.

The sampler consists of body i (Fig. 1), adapters 2 and 3, a sub, 4 with a locking needle 5 (see Fig. 2), a flow-through sampling chamber 6 with an upper 7 and lower 8 valves connected via rods 9 and 10 with valve lock 11 and spring-loaded with respect to the housing by means of guides 12 and 13. In the upper part of housing 1 a locking mechanism (not shown) is installed, which interacts with the valve stem of the upper valve 7. The lower valve 8 is doubled to reduce the sampling force. In the sampling chamber 6, the separating piston 14 is placed with the possibility of axial movement with an axial channel 15 and a bore in the upper end surface in which the valve 17 with an axial bore and seals on

external and internal cylindrical surfaces. The gap between the separating piston and the walls of the sampling chamber is sealed with seals. The stem Yu of the lower valve is placed with a gap in the axial channel of the separation piston and is hermetically mounted in the valve hole of the 17-division piston 14.

The sampler opening assembly consists of stem 18 (Fig. 2), sealing rings 19 and 20, pressure sleeve 21, which cooperates with the sub 4, and disengaging head 22

with flange and set screw 2-3. The sampler works in the following way.

The sampler is lowered on the cable into the well with open valves 7, 8

And 17. Valve 17 is opened by displacing stem 10. When the applied coarse is reached, the sampler is held there for some time to replace the fluid that has entered the sampling chamber from the upstream side.

After the locking mechanism, for example, of the head type, is actuated, the associated valve stem of the upper valve 7 is released, which is pressed to the seat by the action of the spring 12. The valve lock 1 1 p is sac-ated, and the lower valve 8 is also pressed against its seat. Thus, the valve 17 of the separating piston 14 returns to its bore 16 and is sealed. Thus, the depth sample is cut off at the sampler, and the separation piston 14 with valve 17 divides the sampler into two chambers, After that, the sampler is removed from the well and proceed to degassing, which can be carried out in two ways.

The first method is recommended to be used at high reservoir pressure when it is necessary to determine the saturation pressure in the sampling sample. At this time, the degasser head is screwed on adapter 2, which is a screw press (not shown), and normal head is unscrewed on adapter 3 (not shown). .

Before opening the valves 7 and 8, the sampler is thermostatically controlled, and the sample is stirred by a stirrer located under the separator pistons (Fig. 1). After connecting the screw heads, the screw is actuated on the stem of the double valve 8. At the same time, it moves forward and the sample enters the screw press head chamber. Due to the large pressure drop in the sampling chamber and in the head chamber, a rubber sealing ring mounted on the double valve stem 8 is squeezed out of its seat and subsequently holds the valve stem in the open position, and the groove, made in it, ensures free exit of the depth test . .

Gradually unscrewing the screw press and thereby increasing the internal volume of the head — the screw press, according to the pressure gauge installed on it, changes the pressure until the pressure rises sharply. The surge pressure limit will indicate the saturation pressure of the selected depth sample. Thereafter . the stem of the second head acts on the valve stem 7, opens it and, through the valve of this head, pumps oil into the sampling chamber.

At the same time, one of the degassing head valves (screw press) is connected to the test equipment by means of a high-pressure tube, where the depth test is forced out by the separating piston 14.

When degassing a sampler with a previously known saturation pressure or with a low pressure, use the spray head shown in FIG. 2. The head is put on the adapter. 4. The locking needle 5 is unscrewed and the sample is also

5, as in the first case, is displaced through the head by the piston 14.

Supplying the sampler with a distribution piston allows for depth sampling with true

0 with reservoir pressure to obtain reliable characteristics of the reservoir fluid and to degasify the sample without interacting with the working fluid to prevent loss

5 oxidizable components (carbon dioxide hydrogen sulphide) of formation fluid.

thirty

35

Formula-invention

A sampler comprising a housing with a flow-through sampling chamber, upper and lower valves connected through rods to the valve lock, a locking mechanism that interacts with the stem of the upper valve, characterized in that, in order to improve the quality of the sample being taken, the DH is equipped with

A 40-liter piston with an axial bore and a bore in the upper end surface and a valve with an axial bore and seals on the outer and inner cylindrical surfaces, the separating piston placed in the sampling chamber with the possibility of axial movement and sealing of its outer cylindrical surface with walls 50 chamber, the valve is installed in the bore of the separating piston with the possibility of sealing the joint, and the bottom valve stem is placed with a gap in the axial channel 55 of the piston and sealingly mounted in the bore klapnna separating piston.

20 ig 22 ff

Faye. 2

Claims (1)

A sampler including a housing with a flow-through sampling chamber with upper and lower valves with TYPE, psrlppg. η gggilppm llapagkshp, connected through the rods with a valve ₃₅ lock, a locking mechanism that interacts with the rod of the upper valve, characterized in that, in order to improve the quality of the sample taken, it is equipped with a split 40-piston with an axial channel and a bore in the upper end surface and a valve with an axial bore and seals on the outer and inner cylindrical surfaces45, the separation piston being placed in the sampling chamber with the possibility of axial movement and sealing of its outer cylindrical of the surface with the walls of the sampling chamber, the valve is installed in the bore of the separation piston with the possibility of sealing the joint, and the stem of the lower valve is placed with a gap in the axial channel of the separation piston and is hermetically installed in the opening of the valve separation piston.