SU907229A1 - Sampler for formation tester - Google Patents

Description

(5) SAMPLIFIER FOR PLASTIC TESTER

one

The invention relates to the field of Testing oil, gas or water wells using formation testers and is intended for sampling a sealed sample of formation fluid.

The sampler to the formation tester is known, which contains a sliding housing, a receiving tank with inlet and flow valves placed in it, a hydraulic piston and a separation chamber with a wire lock, in which the stem of the inlet and flow valves are rigidly connected to each other, and a cable lock is connected to the hydraulic piston piston .

However, this sampler does not ensure the selection of a high-quality sample, since its cut-off is carried out only after the pressure in the sub-packer zone becomes equal to the hydrostatic in the annulus of the well. In addition, there is no removable container in the sampler; therefore, additional devices and devices for transferring the sample into special containers are required, which is associated with the inconvenience of its maintenance.

A sampler for a reservoir tester is also known, which includes a housing, a driving di (|) power rod, forming a chamber with the housing in communication with the annulus of the well, subs, and located in the housing, a container with upper and lower locking elements - slide valves of the 2T type.

The lack of a sampler is due to the presence of spool-type locking devices, as a result of which a sample of liquid or gas is taken from the formation and enters the sampler through a labyrinth passage of different cross section. This leads to the fact that a part of the previously received washing liquid remains in the sampling container (chamber) and mixes with the sample of formation fluid 39, which adversely affects the reliability of the output. The shut-off valves of the spool type in the samplers, as shown by operating experience, with intensive inflows of formation fluid with abrasive particles carried out of the reservoir, are subject to erosion, which reduces the reliability of their work. The purpose of the invention is to improve the quality of the sampled and increase the reliability of the sampler. This goal is achieved by reMj. That the sampler is provided with a slotted plate that can be cooperated through a biased fixator with a driving differential stem, and the locking elements are made in the form of rotating cranes with eccentric protrusions entering the slotted strip the differential rod forms an atmospheric chamber with the housing, the cross-sectional area of which is smaller than the cross-sectional area of the chamber, communicating with the annular space, and the stem diameter in the atmospheric cavity The diameter is larger than the diameter of the stem below this chamber, but smaller than the diameter of the stem in the chamber, which communicates with the annular sweep. These distinctive features made it possible to create a continuous axial channel through the entire cavity of the sampler with the container. FIG. 1 shows the sampler, a general view; in section when descending in the well; d - top part, bottom part; in fig. 2 - the same in sampling; in fig. 3 is the same, during the selection period, there are products with a split case over the container locking devices: O - upper part, lower part; in fig. k is section A-A in FIG. 3. The sampler consists of a collar comprising a casing 1 and a sub 2, a differential drive rod 3 forming a chamber b with the walls of the sub 2, which communicates with the annulus space, and an atmospheric chamber. The top of the sub 2 is rigidly connected to the sleeve k with the slot P. Inside the sleeve 4 is the sleeve 5, which is rigidly connected to the driving differential rod 3. The sleeve 5 is installed with the possibility of rigid interaction with the bar 6 through the spring-loaded latch 7. The lower part of the bar b and the latch 7 are in the slot 2 of the sleeve C for all periods of operation of the pr-O of the sampler. The upper part of the drive shaft; 15 of the differential rod 3 forms with the sleeve a flow resistance channel (7, which functions as a relay for moving the rod 3). The housing 1 contains a container consisting of the sub 8, the housing 9 and the sub 10. , made in the form of rotary valves 11 and 12 with retaining spring rings 13, 1i and rubber seals 15 and 1b. On valves 11, 12, eccentrically located protrusions e, Jc are made, angled 5 relative to the axis of the passageway of the crane, the strips 6 entering into the slots {Fig. 3). At the top of the container is a non-return valve consisting of a ball 17 and a sleeve 18, which prevents the annular pressure from penetrating into the container 9 at the time of cutting off the sample. In the lower part of the container 9, an auxiliary sleeve 19 is placed. The thread into which it is screwed is used to connect a device that serves to displace the sample. Inside the container 9 is a piston 20, which serves to displace the sample. The axial channel of this piston, when displacing the sample, is blocked by a special device. Container E in the body of the sampler is stationary. The axial movement of the container is prevented by the contact of the ends of the casing 1, the bushings with the ends of the subs 8 and 10 of the container, respectively. The sampler works as follows. The radial movement of the container is hampered by the presence of protrusions on subs 8 and 10, coinciding with the probe casing 1 (Fig. 4). Removing the container 9 from the sampler body is carried out freely when the sub 2 is disconnected. When the tool is lowered in the well, the sampler parts are located in the position shown in FIG. 1. The container is filled with liquid during the descent through the open valve 12. The flushing liquid flows through the sampler during the descent outside and inside the container, through the axial channels of the driving differential rod 3, bushings 5, the container cavity, the radial channel enclosed between the container 9 and the casing 1, and the axial channel of the casing 1 of the sampler. After opening the inlet valve of the reservoir tester and closing its equalizing valve, the pressure in all nodes located below the reservoir tester, including the sampler, will drop to hydrostatic in the pipes. Under the action of pressure differential (chamber O), the driving differential rod 3 will begin to move upwards, overcoming the downward force from the hydrostatic pressure in the pipes to the differential area of the rod forming the atmospheric chamber (chamber -b) with the probe body.

After some time, the value of which is due to the presence of the hydraulic resistance channel d, the driving differential rod 3 with sleeve 5 and spring-loaded latch 7 will move to the extreme upper position. The latch 7 will enter the slot of the bar 6. The sleeve 5 will be sealed in the sleeve 19 of the container and direct the entire flow of formation fluid through its cavity. The details of the sampler are installed in the sampling position (Fig. 2).

After opening the balancing valve of the tester (the end of the test), the pressure in the sampler increases sharply to hydrostatic in the annulus of the well and becomes equal to the pressure in chamber 5. As a result, the driving differential rod 3 under the action of hydrostatic pressure in the annulus of the well to the differential area of the rod 3 forming with the sampling body of the atmospheric chamber will move to the lowest position together with the sleeve 5, the latch 7, the bar 6. At the same time, the bar 6 acts and protrusions Q, F valves 11, 12 will turn them into a closed polosvobodno out from the case while Release-sub 2. The housing 1 is inserted into another container, is screwed sub 2. Thereafter,

the sampler is considered to be prepared for future work.

The use of container-type samplers with a continuous axial sampling chamber will allow

to improve the quality of sampled samples due to the complete replacement of the washing liquid in the container by the reservoir layer, as well as its reliability by eliminating the size of the shut-off

container devices and loss of an airtight sample.

In addition, the use of such samplers will facilitate the operating conditions, since there is no need to transfer the sample to a special container for transportation and to have special devices and devices for this.

Technical and economic effect of

the introduction of the sampler will be obtained due to the presence in it of a straight axial channel of a relatively large diameter, which ensures work with drilling mud, barite and hematite.

The average economic effect from testing in the process of drilling an object is 10 thousand rubles. The specific gravity of the sampler in the test equipment set is 20%.

Claims (2)

Annual economic effect from the use of the sampler with the expansion. After the taps 11, 12 are closed, the sleeve 5 will come out of the sleeve 19, as a result of which a channel for the flow of flushing liquid is formed outside the closed container. The presence of a hydraulic resistance channel provides the necessary delay time for moving the drive differential rod 3 and for turning the associated container cranes (through sleeve 5, latch 7, bar 6). This is necessary in the case of an uncontrolled short-term opening of the inlet valve of the formation test when the equipment is lifted from the well after the test. After removing the container 9 from the body of the sampler, it is sent to the laboratory. The container will be about the fate of its implementation of 500 thousand rubles. Claims for testing a reservoir, comprising a housing, a driving differential rod forming a chamber with the housing in communication with the annulus of the well, subs, and a container with an upper and lower locking elements placed in the housing, characterized in that sampled and increased reliability in operation, he sleeps with a slotted bar, which is interoperable through a spring-loaded clamp with a differential water stem, and 98 shut-off elements The cops are made in the form of rotary cranes {with eccentrically located protrusions entering into the slits of the bar, the differential rod forming atm with the body (a spherical chamber with a cross-sectional area less than the cross-sectional area of the chamber communicating with the annular space and the diameter of the stem in the atmospheric chamber larger than the diameter of the stem below this chamber, but smaller than the diameter of the stem in the chamber in communication with the annulus. Sources of information taken into account in the examination 1. USSR author's certificate number, cl. E 21 B, 1971-. 2. USSR author's certificate number 697707, cl. E 21 W W02, 1977 (prototype). 1