SU1620621A1 - Once-through fill-flow formation tester - Google Patents

Abstract

The invention relates to the oil and gas industry and is intended for testing objects in deep wells for oil, gas and water. The purpose of the invention is to increase the reliability of sampling. The reservoir tester consists of interconnected nodes A and B of a ball valve with a connecting sub and a hydraulic actuator

Description

The invention relates to the oil and gas industry, in particular to reservoir testing equipment on pipes, and is intended for testing objects in deep wells for oil, gas or water.

The aim of the invention is to increase the reliability of sampling.

FIG. 1 shows a continuous full bore plastipatel, section, FIG. 2 shows the time delay mechanism in the Paking position; the section in FIG. 3 is the same in the position. Delay, 1 in FIG. 4 - layout of plastotest in the well.

The plastic tester contains a shut-off ball valve A, a hydraulic power drive B, a booster gas chamber C and a time delay mechanism D.

The shut-off ball valve A includes a housing 1 with a conical connecting thread 2 in the upper part and a cylindrical thread 3 in the lower part. In the upper part, the housing 1 is provided with an abutment saddle 4 installed in the cylindrical rack 5 with radial holes 6. The internal axial cavity of the rack 5 forms the beginning of the straight full bore channel 7 of the plastotest. In the lower part, housing 1 is provided with channels 8 located around the circumference of the thickened lower part of housing 1. In the inner cylindrical cavity 9 of housing 1, a fork 10 is movably mounted, provided with open grooves 11 in the upper part, and a cylindrical valve with a cylindrical valve in the lower part formed by radial holes 12, sealing elements 13-15 and cylinder axial bore in the thickened lower part of body 1, made with a diameter equal to the diameter of the rod 11a.

In the inner cylindrical bore of the plug 10, a cup 16 with a seal 17 is mounted movably and tightly (relative to the fork 10). The cup 16 is rigidly fixed in the groove 18 of the housing 1. In the cup 16, the lower seat 20 with the sealing elements 21 and 22 is mounted between the upper 4 and lower 20 saddles spring-mounted ball 23 with an axial channel 24. Parallel to the axial channel 24, the ball 23 is provided with ends on which two protrusions 25 are rigidly and oppositely mounted. The beginning of the channel in the housing 1, the axial channel 24 of the ball 23 and the axial bore 26 of the forks 10 form a straight-through channel polioprohodnoy shutoff ball valve A.

The power hydraulic actuator B comprises a housing 27, in the upper part of which there is a thread for connecting to the housing 1 of the ball check valve A and the radial openings 28, and in the lower thickened part — channels 29 circumferentially

and connecting thread 30. In the inner cylindrical cavity 31 of the housing 27 a power piston 32 is installed with a seal 33. The piston 32 is rigidly connected to a hollow rod 34, which in the upper part is tightly screwed with a fork 10, and in the lower part is movable and tightly mounted in an axial bore jg part of housing 27 thickened and provided with a seal 35. In cavity 31, which is part of gas chamber C, a force spring 36 is installed.

The piston 32 and rod 34 are made so that 55 that the upper and lower surfaces of the piston 32 have the same working area. An axial passage in the rod 34 forms a continuous flow channel in hydraulic actuator B.

The booster gas chamber C includes a hollow body 37, in the upper part provided with threads for connection to the drive unit B, and in the lower thickened part - channels 38 located around the circumference and connecting 25 thread 39, In the lower part of the housing 37 tightly and coaxially screwed smooth hollow rod 40, the upper part of which is provided with a seal 41. movably enters the axial bore of the housing 27. drive B „R annular space 42 ,. forming a gas chamber, a floating annular separate piston 43 is movably mounted, provided with sealing elements 44 and 45, having an annular undercut in the lower part forming a cavity under the annular piston 43. The axial passage in the rod 40 forms a flow channel in the booster gas 40 chamber WITH.

The time delay mechanism D contains a hollow body 46, in the upper part provided with threads for connection to the body 37 of the gas chamber 5 C, and in the lower part - a lock 47. On the side surface of the body 46 there are additional radial inlets 48 and holes 49. Internal cylindrical expansion - 50 point housing 46 in the lower part has an annular step 50, which moves to the axial bore of a smaller diameter. In the internal cavity of the housing 46, a sub-55 movably mounted multi-channel spool in the form of a piston 51 with a rod 52 is movably mounted. To eliminate rotation of the rod 52 relative to the housing 46, it is through a longitudinal

a groove 53 is movably connected to a pin 54 rigidly fixed in the housing 46. The spool piston 51 is provided with vertical channels 55 connected to radial holes 56 and 57. Below the holes 57 are radial holes 58, which are connected to an axial flow channel 59 in rod 52. Sealing elements 60-64 are located between the radial holes 56, 57 and 58. To keep the spool switch 51 in the lowest position inside the housing 46 is installed pre-compressed spring 65.

The rod 52 in the upper part is provided with a seal 66 and movably enters the axial cylindrical bore of the housing 37 of the gas chamber C. Openings 48 and 56, channels 55 and sealing elements 60 and 61 form a shut-off valve, and holes 49 and 58, full passage 59 in the stem 52 and sealing elements 63 and 64 are egalitarian. In the lower part, the rod 52 is provided with a groove 67 and an end pipe thread 68, through which it is rigidly and tightly screwed with a locking nipple 69 for connection to the sampler P (Lig.4).

The device works as follows.

Before descending into the well, all sections A, B, C, and D of the plastic tester must be tightly screwed together and brought into the state shown in Fig. 1. In this case, the ball valve 23 tightly closes the axial channel 7, the channels 8 and the holes 12 on the stem of the fork 10 are separated, the piston 32 under the action of the pre-compressed spring 36 is in its extreme upper position. I

Gas chambers 31 and 42 are filled with gas (nitrogen) at a pressure of 10-15% of the expected hydrostatic pressure in the well at the depth of equipment descent. Under the influence of the atom pressure in the gas gauge C, the annular piston 43 is in its lowest position. The spool switch 51 of the time delay mechanism D is in its lowest position due to the action of the pre-compressed spring 65. The side holes 48 and 49 on the housing 46 are aligned with the holes 10.

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71620621

Mi 56 and 58 spool switch bodies 51.

The layout of the plastotest equipment descending into the well on the pipes is shown in Fig. 4. One of the typical layouts of elongated drill pipes (UBT), circulation valve (K), assemblies, is lowered into the casing string (OT) on the drill pipes (BT). A, B, C, and D (Fig, 1), then a sampler (P) s auxiliary equipment (O) and a packer device (PC) supported by O column walls with a filter (F).

As the equipment descends into the well, all the increasing hydrostatic pressure in the annulus of the well manifests itself. This pressure, through the opening 28 of the node B, acts on the upper surface of the piston 32, tends to take it out of the state of equal and shift downwards.

However, this does not occur, the piston 32 remains balanced due to the fact that the pressure in the annulus – IHOM space through the openings 48 and 49 of the node D and the openings 56, 55 and 38 affects the lower surface of the annular piston 43 of the booster chamber 42 of the node C. Piston 43 moves upward, compresses gas to hydrostatic pressure. Since the working areas of the piston 32 at the top and bottom are equal in magnitude, the piston 32 remains balanced. Thus, throughout the entire equipment descent into the well, the equilibrium of the piston 32 of the actuator B. is automatically maintained. For the purpose of ensuring the replacement of fluid from the axial channel of the equipment into the annulus of the well in the descent process, an equalizing valve located in the spool switch D and formed by holes is used. 49 and 58 in the position shown in figure 1. Upon reaching a predetermined depth

25

thirty

3S

40

45

eight

They are cut off from the cavity of the axis 59 (openings 49 and 58 of the hole), as well as from the half of the underlying ring piston 43 (48, 56 and 57 are separated). In this case, the pressure in the gas chambers and 31 stabilizes and then retires as the pressure in the annulus changes in this state of formation to work. For this purpose, a level pressure is created in the internal space corresponding to the working pressure of the actuator B of the tester. Since now — under the piston 32 — not compensating above the piston 32 increases the gap with the annular space through the openings 28, the post piston 31 comes out of equals moving downward by the magnitude of the distance, As a result of the downward movement, a plug 10 is transmitted through the rod 34. in the course of marriage, combines channels 8 and 1, as a result of which the perpendicular valve is removed to the ball valve 23 (bypasses steam through cavity 9 and b), and then turn the valve 23 through an angle of 90 °, thus cutting channel 24 in the ball 23 with the axial shaft cash 7. Plastov. through the flow channels 59, and 7 begins to flow into the drill pipe. This corresponds to the first test well test period. Then the pressure in the well space is squeezed by the flow, as a result of which the force of the compressed gas spring in the gas chambers 31 is boosted and the rod 32 returns upwards and the plug 10 turns the closing valve. The 1st Zak period begins to uncover a rigid reservoir (HPC) curve.

By creating and removing d in the annulus of the SLE, you can perform several from

descent of the plasto-testing equipment- ™ of closed test periods.

eight

0

five

0

five

0

S

0

five

They are cut off from the cavity of the axial channel 59 (openings 49 and 58 are disconnected), as well as from the half-body under the floating ring piston 43 (openings 48, 56 and 57 are separated). In this position, the pressure in the gas chambers 42 and 31 stabilizes and is not further compensated for when the pressure in the annulus of the well changes. In this state, the plastotest is ready for operation. To do this, a pressure of the 1st level is created in the annulus, corresponding to the working pressure of the actuator B of the plastostatic unit. Since now the displacement under the piston 32 is not compensated, but increases over the piston 32 (communication with the annular space of the well through the openings 28 is constant), the piston 31 goes out of balance and moves down by the amount of working stroke. the rod 34 is transferred to the movement of the plug 10, which along the bottom aligns the channels 8 and 12, as a result of which the pressure drop to the ball valve 23 is removed (the liquid bypasses steam through the cavity 9 and the hole b), and then turns ball valve 23 at an angle of 90 °, rez Ultimately, the channel 24 in the ball 23 is aligned with the axial to the fracture 7. The reservoir fluid. Through the flow channels 59, 26, 24 and 7 begins to flow into the drill pipe. This corresponds to the 1st open test period of the object in the well. Then, the pressure in the annulus of the well is compressed to the original, as a result of which, under the action of the force of the compressed spring 36 and the gas in the gas chambers 31 and 42, the piston 32 returns upward and turns the valve 23 through the plug 10 to close. The 1 st closed period begins to take the formation characteristics curves (HPC).

By creating and relieving pressure in the annulus of a well, several openings can be performed and

closed testing periods.

The well is packaged with a compressive load due to the weight of the UBT (Fig. 4). At that, the spool switch 51 of the node D moves to the second axial position shown in Fig. 2 and is held by the latch 47 # resulting in the cavity of the annulus of the well

However, any testing of an object in a well is aimed at selecting a high-quality sample of formation fluid. In the reservoir testing equipment controlled by the annular pressure, for this purpose there are specialized samplers h, which are also driven by the pressure generated in

the well annulus, but is larger than the pressure level required for the operation of the reservoir. This circumstance undermines the quality of the sampling, since the sampling is performed with the plastotest valve open, i.e. in the open test period, as a result of which a sample is taken at a pressure close to the reservoir pressure. This 1 is only possible at the end of the closed test period. However, to do this, during the sampling period, the plastic tester does not react to the pressure created in the annulus, i.e. was blocked. Before sampling the formation fluid at the plastotest equipment, an additional short-term compressive load is created at the end of the closed test period, as a result of which the latch 47 and the slide valve (time delay mechanism) are triggered to the third axial position, as shown in FIG. .З. In this case, the collet lock 47 exits from the groove 67 of the rod 52 and moves up to the stop into the end of the drill 69. The holes 48 on the housing 46 are aligned with the holes 57 and the cavity of the annular space of the well under the floating annular piston A3 is communicated, the pressure in the gas the chamber is again compensated and, therefore, the port 32 of the power drive B remains in equilibrium, i.e. the work of plastois pygatel is blocked. Thereafter, a pressure equal to the working pressure of the sampler is created in the annulus of the well, which leads to the triggering of the sampler with the valve of the reservoir closed. Her-

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five

If it is necessary to continue the test of an object in the well, one should lift the tool in the well and transfer the spool switch L to the second axial position shown in FIG.

Claims (1)

Invention Formula A full-bore full-pass plastipatel containing a ball valve assembly with a connecting sub, a hydraulic actuator of a ball valve connected to a ball valve assembly, a booster gas chamber with a floating ring piston connected to a hydraulic drive assembly, a time delay mechanism with a node for connecting to a sampler, connected to the booster gas chamber assembly and made in the form of a housing with radial holes and a spring-loaded hollow rod installed in it with a radial It is possible to communicate with the radial opening of the housing, which is due to the fact that, in order to increase the reliability of sampling, it is equipped with a lock fixed to the time delay mechanism housing, the time delay mechanism housing is made on the latch side, it is made with an annular groove to with additional radial holes communicated with each other to communicate the annulus cavity with the melt cavity Lorin present node dozhimkoy annular gas chamber through the additional radial openings in the housing a time delay mechanism. Nl