SU825889A1 - Closure device to formation tester - Google Patents

Description

one

The invention relates to deep drilling, and more specifically to testing well-related pressure measurement, and is intended to work with a reservoir tester to carry out depth records of initial pressure curves, pressure recovery curves, flow curves for determining formation parameters with a deep gauge. such as reservoir pressure, permeability of the reservoir in the radius, perforation, bottomhole effect, etc.

A locking device is known. It is used in conjunction with testers and formation testers to carry out their research fl

The drawback of the device is the inability to perform a full range of reservoir studies with a single tool descent.

A locking device to the formation tester is known, including a hollow body mounted to the column pipe and installed in it with the ability to move a landing sleeve with a saddle under the discharge valve with pressure gauge 2. However, to ensure multiple recording of the flow curves

lift the entire instrument to the surface. Lifting the instrument is also necessary to check the quality of the recording of the flow curves. The implementation of tripping takes a considerable amount of time, which increases with increasing depths of the promising horizons.

0

The purpose of the invention is to provide the possibility of multiple recording of flow curves without lifting the tool when several objects are tested in a cased hole.

five

The goal is achieved by the fact that the stem is made with a saddle under the shut-off Valve and radial holes in which the stem locking balls are installed, and the mounting bushing is made with an internal step to interact with locking balls.

FIG. 1 shows the locking device when the valve is seated; FIG. 2 - the same, when triggered by the landing of a pipe string, in FIG. 3 is the same, with the valve fixed, in FIG. 4 - ball retainer when the device is triggered from landing 0 of the pipe string. A locking device to the formation tester is included in the test equipment and works in conjunction with it. It consists of a part that is lowered inside the pipes on the cable and a part connected by a colol pipe that serves as a seat for the first one. The part that is lowered and retrieved on the cable is a valve 1 combined with a depth gauge and has a tip 3 for carrying out transportation. The valve 1 of the locking device is made with the upper 4 and lower 5 annular spikes under the balls 6, which are separated by an annular BT / mouth 7. The valve 1 contains sealing sealing rings 8. A part of the locking device on the pipes has a central through channel and ensures the installation and fixation of valve 1 in the cylindrical seat 9 of the movable tubular rod 10. The stem 10 carries in the radial holes 11 the fixation balls 6 and has a balancing hole 12, which ensures that the valve 1 is unhindered in the seat 9. In the housing 13 of the device is installed a landing sleeve 14, which serves for the initial installation of the valve in the seat 15 and for subsequent interaction with the retainer balls 6. When installing the valve in the cylindrical seat 9 of the stem 10. The sleeve 14 is made with two inner ring grooves — the lower 16 of larger diameter and upper 17 smaller diameter and annular ledge 18 between them. The seat of the sleeve 14 in the housing 13 is sealed with a rubber ring. In the lower part of the locking device, an equilibration unit is placed, the function of which is to keep the movable part of the device in suspension during the transfer between the pipe and annulus pressures. It is a chamber 20 formed by a sub 21 connected to it on a thread by a sub 22 having an internal cylindrical grinding surface, an upper 23 and a lower 24 sealing sleeves with sealing rings 25 and 26. In the chamber 20 the rod 27 moves with sealing rings 28, the opening 20 of the chamber 20 communicates with the annulus, and in the lower part the opening 30 is connected with the internal cavity of the pipe string. For technological reasons, the assembly of the rod 27 is made separately from the rod 10 and is connected with the latter. In the operation of the locking device, both rods act as one. The transmission of rotation from the tr column to the locking device is carried out by means of the sub 31 with inserted splines 32, which cooperate with the rod 33 (connected to the rod 27), having key slots. The keys 32 are prevented from falling out of the cover 34 with the screw 35. At the bottom of the stem 22, there is a threaded sub 36 with an external thread connected to the tool. In series with a set of test equipment, the valve body is connected to the pipes and lowered into the well. Empty tubes create a depression on the reservoir. In order to reduce depression to the formation, pipes may be partially filled with fluid. For this, a valve 1 with a pressure gauge 2 is preliminarily lowered onto the cable, after which the liquid is filled. A deflated valve is installed in the saddle 15 of the seating sleeve 14, blocking the access of fluid to the subvalvular cavity, and thereby forms an air chamber in it. The length and volume of such an air chamber is determined by linear meters of connected pipes from the locking device to the reservoir test valve, this volume is determined depending on the required test conditions. Depth gauges and other instruments are located in the air chamber to provide deeper information about the reservoir with the recording of the initial pressure recovery curve with the test period closed (i.e., with the shut-off device closed, when there is no connection of the test formation tester and pipe with atmosphere). When the shutter comes to the piping, the closure device assembles the test interval, and the tube string is pushed to create an axial load. In this case, the movable tool rods move, the rubber element is deformed in the packer, thereby isolating the test object from the hydrostatic liquid column, the receiving valve opens in the formation tester. In the locking device, the housing 13 with the seating bushing 14 supporting the valve 1 with the pressure gauge 2 moves downwardly relative to the stem 10. The collar 7 of the valve stem stem is pushed into the lower annular recess 16 of the mounting bushing 14i. The valve 1 is able to move down to fit the cylindrical seat 9 of the stem 10. The valve burt 7 is below the balls 6. Further downward movement of the housing 13 together with the sleeve 14 pushes the balls 6 (step 18) into the upper annular groove 4 of the valve. This ensures the passage of the rod 10 in the upper annular recess 17 of the landing sleeve 14 (Fig. 3)

and reliable fixation of valve 1, preventing it from being pushed out. a lump of fluid that occurs when the reservoir test valve opens.

After delaying the time required for the formation test with a closed period, the influx of formation fluid is created by communication of the subvalvular zone with the valve valve. This achieves a slight tension on the tubing string. The housing 13 with the sleeve 14 moves upwardly relative to the rod 10. The seat seat 15 of the sleeve lifts the valve 1 in the cylindrical seat 9 of the stem 10. Lower, larger diameter, the undercut 17 of the sleeve 14 aligns with the ball retainer of the stem and the step 18 sleeves pushes the balls 6 under the collar 7 of the valve, into its lower annular groove 5. The valve 1 is released and the valve cavity communicates with the valve valve, as the valve rises in the saddle 15 by the pressure of the reservoir fluid or gas.

If it is necessary to re-close the test period and record the pressure recovery, the tube string is slightly lowered down, which results in re-mounting and fixing the valve 1 in the cylindrical seat of the stem 10.

If it is necessary to check the quality of the recording or to free the channel of pipes for lowering other devices or performing other work, the valve 1 is removed by means of a winch on a cable with a slip.

Claims (2)

1. USSR Author's Certificate No. 317783, cl. E 21 V 49/00, 1968. 0 2. Yasashin A.M. and A.Yakovlev. Well testing. M., Nedra, 1973, p. 168-170. Y5