Packer assembly for selective reservoir testing

FIELD: oil production, particularly devices to perform reservoir tests in wells, including that having opened bores.

SUBSTANCE: device comprises upper connection unit for device fixation on pipe string, upper and lower packers with sealing members, upper and lower movable rods provided with axial channels arranged inside packers and hollow filter installed between upper and lower packers. Axial channel of lower movable rod is provided with solid partition. Upper and lower movable rods are fixedly connected with each other in air-tight manner and provided with upper connection unit. Upper and lower rods may be displaced only in downward direction with respect to upper and lower packers. Sealing members of upper and lower packers are located between stops. Upper stop of lower packer is fixedly connected with lower stop of upper packer provided with balloon-type centrators through hollow filter. The balloon-type centrators are arranged from top thereof. One stop of each packer is made as hydraulic cylinder fixedly connected with packer and as annular piston cooperating with sealing member. Inner cavities of each hydraulic cylinder may cooperate with axial channels of movable rods over solid partition and may provide air-tight isolation thereof during movable rod displacement in downward direction with respect to packers. Upper movable rod is provided with radial channel sealed with packer and adapted to cooperate with ambient space through hollow filter during movable rods displacement in downward direction with respect to packers.

EFFECT: simplified structure, decreased costs of device production and increased operational reliability.

1 dwg

 

The invention relates to the oil industry, namely, devices for testing of formations in vertical, directional and horizontal wells, including those with open trunks.

Known formation tester without relying on slaughter interval type IM-8, developed by the Institute VNIIBT (Asasin A.M. and other Equipment and technology of formation testing while drilling directional wells. M.: Nedra, 1972, p.84-94), including upper and lower packers with hydraulic sealing elements, the filter performs both the role of housing in which are located the hydraulic pressure channels serial communication of sealing elements and balancing device), the pressure compensation channel, inlet valve, a hydraulic cylinder with a differential piston, a shut-off control valve spacerowa (with a spring lantern), the Cam mechanism. When using IE-8 to implement Petrovci is pripodniatii and rotation of the pipe string. Also rotation of the drill pipe closes the inlet valve.

The disadvantages of the design of the device are:

first, the design complexity, due to the large number of components and parts;

secondly, the complexity of manufacturing related to the fact that in the body of the filter is made hydraulic (magnetfeld the e-channels, connecting sequentially the cavity of the lower and upper packers;

thirdly, the technological complexity of use of the device, due to the fact that in the process it is necessary to perform the axial movement and rotation of the pipe string to Petrovci and control the operation of the deep valve system, which complicates the implementation of reliable Petrovci.

The closest is pokerwise device for selective testing of formations (patent RU №2101463, IPC 7 EV 33/124; 49/08, publ. in bull. No. 1 from 10.01.1998 g)containing the upper and lower packers with hydraulic sealing elements, movable rods made with sevime channels placed in the cavities of the packers, and the hollow filter installed between the upper and lower packers, while in the axial channel of the rolling stock of the upper packer a check valve, made with a bypass channel, the movable rod of the lower packer is equipped with a blank wall and forms the upper part of the lower packer camera connected with a bypass channel valve flexible connector placed in the cavities of the filter.

The disadvantages of the design of the device are:

first, the design complexity, due to the large number of components and parts;

secondly, large material costs due to the complexity of manufacture, Assembly, use and maintenance the maintenance;

thirdly, the low reliability due to the large number of mating parts.

The objective of the invention is to simplify the design of the device, the reduction of material costs for manufacturing, as well as increased reliability.

The problem is solved patrolsim device for selective testing of formations, containing the upper connecting node to lock on to the string of pipe, the upper and lower packers with the sealing elements, the upper and lower movable rods, provided with axial channels placed in the cavities of the packers, and the axial channel of the lower movable rod provided with a hollow wall, and a hollow filter installed between the upper and lower packers.

What's new is that the upper and lower movable rods rigidly and tightly connected to each other, equipped with top of the connecting node and configured to move relative to the upper and lower packers only down, with sealing elements of the upper and lower packers are located between the lugs, and the upper stop of the lower packer is rigidly connected to the hollow filter with the lower stop on the top of the packer, which is supplied from above by a spring centralizers, and one of the stops of each packer is made in the form of a hydraulic cylinder rigidly connected with the packer, and an annular piston that communicates the sealing element, moreover, the internal cavity of each cylinder is arranged to interact with the axial channel of the movable rod above the hollow partitions and hermetic isolation, when moving the movable rod down relative to the packers at the top of the movable rod provided with a hermetically blocked by the upper packer radial channel configured to communicate with an external space through the hollow filter when moving the movable rod down relative to the packers.

The drawing is a longitudinal section presents the proposed pokerwise device for selective testing of formations in the original position.

Pokerwise device for selective testing of formations contains the upper 1 and lower 2 packers with the sealing elements 3 and 4 respectively, the upper 5 and lower 6 movable rods, provided with axial channels 7 and 8, are placed respectively in the cavities of the upper 1 and lower 2 packers.

The axial channel 8 of the lower movable rod 6 provided with a blank partition 9. Between the upper 1 and lower 2 packers installed hollow filter 10.

Top 5 and bottom 6 of the movable rods rigidly and tightly connected to each other via a pipe 11, and the top of the upper movable rod 5 has an upper connecting node 12. Top 5 and bottom 6 of the movable rod is configured to move the tion relative to the upper 1 and lower 2 packers down only.

Sealing elements 3 and 4 of the top 1 and bottom 2 of the packers, respectively, are located between the lugs 13 (14) 15 (16). The upper stop 15 of the bottom packer 2 is rigidly connected to the hollow filter 12 with the lower stop 14 of the upper packer 1.

The upper packer 1 is equipped with top spring centralizers 17. The stop 13 of the upper packer 1 and the stop 16 of the bottom packer 2 is made in the form of a hydraulic cylinder 18 (19)rigidly connected responsibly with top 1 and bottom 2 of the packers, and the annular piston 20 (21), which interacts with the sealing element 3 (4).

The internal cavity 22 (23) of each hydraulic cylinder 18 (19)is arranged to interact with the axial channel 7 (8) of the movable rod 5 (6) above hollow partitions 9 and hermetic isolation, when moving the movable rod 5 (6) down relative to the packer 1 (2). The upper movable rod 5 provided with a hermetically blocked by the upper packer 1 radial channel 24, is arranged to communicate with an external space (not shown) through the hollow filter 10 when moving the movable rod 5 (6) down relative to the packer 1 (2).

Unauthorized overflows of liquid are excluded sealing elements 25, 26, 27, 28.

Pokerwise device for selective testing of formations is as follows.

At the wellhead (not shown) select the required length of the filter 10, depending on the height of ispytyvaemoj of the reservoir and through sub 11 connect the upper 5 and lower 6 motile rods. After that pokerwise device Assembly on the string of pipe 29 is lowered into the borehole, with the axial channel 7 (8) of the rolling stock 5 (6) communicates with the internal cavity 22 (23) of the hydraulic cylinder 18 (19), and a radial channel 24 of the upper movable rod 5 is hermetically covered by the upper packer 1. In the process of descent pokerwise device into the well spring centralizers 17 center the device about the axis of the well.

Reaching the tested reservoir (not shown), pokerwise device is positioned so that the upper packer 1 is positioned above the test layer, and the bottom packer 2 was below the test layer.

Further from the wellhead in the string of pipe 29, the axial channel 7 (8) create excessive pressure (e.g 15.0 MPa), which enters into the internal cavity 22 (23) of the hydraulic cylinder 18 (19) and acts on the annular piston 20 (21), as the bottom of the lower movable rod 6 provided with a blank partition 9.

Under the action of excess pressure in the annular piston 20 (21) is sealed relative to the cylinder 18(19) moves, compressing the sealing element 3 (4), while the annular piston 20 moves downward, and the annular piston 21 upward.

The sealing element 3 (4) is compressed, tightly clinging to the inner walls of the borehole (not shown), experience the reservoir is hermetically isolated as light is Hu, and from below.

Next, without relieving excess pressure (15.0 MPa) in the string of pipe 29, the axial channel 7 (8), respectively, and the internal cavities 22 (23), because they are hydraulically connected, lower the string of pipe 29 down until the radial channel 24 will not come out of sealed engagement with the upper packer 1 and will not be installed in front of the hollow filter 10, with the internal cavity 22 (23) hydraulically clipped from the internal space of the column pipe 29, the axial channel 7 (8) movable rod 5 (6), forming a seal.

In this position make the test layer enclosed between the upper 1 and lower 2 packers, while the injected fluid through the string of pipe 29, the axial channel 5, the radial channel 24 and the hollow filter 10 is fed in the test layer.

After completion of the testing of the reservoir pressure in the string of pipe 29, the axial channel 7 (8) dump. The string of pipe 29 is lifted up until pokerwise the device will not return to its original position (see drawing), while the axial channel 7 (8) of the rolling stock 5 (6) will communicate with the internal cavity 22 (23) of the hydraulic cylinder 18 (19), and a radial channel 24 of the upper movable rod 5 is sealed overlaps the upper packer 1. After that pokerwise the device may be retrieved to the surface or selectively transferred to the second well and the tests of the next layer.

Offer pokerwise device for selective testing of formations has a simple structure, resulting in reduced material costs for its production, and simplified the process of applying the device allows to achieve high-quality spacerace and improve reliability in General.

Pokerwise device for selective testing of formations, containing the upper connecting node to lock on to the string of pipe, the upper and lower packers with the sealing elements, the upper and lower movable rods, provided with axial channels placed in the cavities of the packers, and the axial channel of the lower movable rod provided with a hollow wall, and a hollow filter installed between the upper and lower packers, characterized in that the upper and lower movable rods rigidly and tightly connected to each other, equipped with top of the connecting node and configured to move relative to the upper and lower packers only downwards, thus sealing elements top and lower packers are located between the lugs, and the upper stop of the lower packer is rigidly connected to the hollow filter with the lower stop on the top of the packer, which is supplied from above by a spring centralizers, and one of the stops of each packer is made in the form of a hydraulic cylinder rigidly connected with the Pak is om, and an annular piston that interacts with a sealing element, with the inner cavity of each cylinder is arranged to interact with the axial channel of the movable rod above the hollow partitions and hermetic isolation, when moving the movable rod down relative to the packers at the top of the movable rod provided with a hermetically blocked by the upper packer radial channel configured to communicate with an external space through the hollow filter when moving the movable rod down relative to the packers.



 

Same patents:

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Sampler // 2278259

FIELD: hydrogeological well survey, particularly to take subsurface well fluid samples.

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FIELD: oil and gas industry, particularly to increase well productivity by hydrodynamical well perfection improvement.

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3 dwg

FIELD: packing devices for isolating shaft of wells during various technological operations.

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4 cl, 13 dwg

The invention relates to a tool and method for injection of a sealing liquids, for example, what are the means for cementing oil-bearing layers of sand or chemical agent for stimulation with the aim of increasing its oil and liquid for rinsing wells feed her there in an excessive amount, inside geological formations surrounding an underground borehole

The invention relates to the oil industry, in particular to the means of preservation of reservoir properties reservoir

The invention relates to industries, a leading drilling for oil, gas and water

FIELD: packing devices for isolating shaft of wells during various technological operations.

SUBSTANCE: interval packer device contains longitudinally positioned upper and lower packers with sealing collar packing. Upper packer is made hydro-mechanical, lower packer - repression-depression action hydraulic packer. Positioned between packers is valve unit of two-side action, hydraulically connected to lower packer through in-pipe and annular spaces. It consists of hollow body with at least one radial channel and differential bushing with radials apertures positioned on the body and spring-loaded on both ends by means of reciprocal force springs. All packers are made so that each one of them may be used independently or in composition of other assemblies.

EFFECT: increased reliability of operation and expanded functional capabilities of devices.

4 cl, 13 dwg

FIELD: oil production, particularly devices to perform reservoir tests in wells, including that having opened bores.

SUBSTANCE: device comprises upper connection unit for device fixation on pipe string, upper and lower packers with sealing members, upper and lower movable rods provided with axial channels arranged inside packers and hollow filter installed between upper and lower packers. Axial channel of lower movable rod is provided with solid partition. Upper and lower movable rods are fixedly connected with each other in air-tight manner and provided with upper connection unit. Upper and lower rods may be displaced only in downward direction with respect to upper and lower packers. Sealing members of upper and lower packers are located between stops. Upper stop of lower packer is fixedly connected with lower stop of upper packer provided with balloon-type centrators through hollow filter. The balloon-type centrators are arranged from top thereof. One stop of each packer is made as hydraulic cylinder fixedly connected with packer and as annular piston cooperating with sealing member. Inner cavities of each hydraulic cylinder may cooperate with axial channels of movable rods over solid partition and may provide air-tight isolation thereof during movable rod displacement in downward direction with respect to packers. Upper movable rod is provided with radial channel sealed with packer and adapted to cooperate with ambient space through hollow filter during movable rods displacement in downward direction with respect to packers.

EFFECT: simplified structure, decreased costs of device production and increased operational reliability.

1 dwg

FIELD: hydrocarbon production, particularly for separately-simultaneous or alternate working fluid injection in one or several pools.

SUBSTANCE: plant comprises the first packer connected to flow string and lowered under upper pool, flow string disconnector arranged over the first packer and seat to receive retrievable check valve located between the first packer and flow string disconnector. Arranged below the first packer is the second packer, which creates packer section along with the first packer. The packer section includes at least two mandrels with seating units arranged therein, circulation valve and liquid flow turbulator. The seating units receive oscillator generator and removable valve or bridge plug. Turbulator is installed at lower edges of circulation orifices formed in casing pipe within the limits of oil pool to be developed. Number of packer sections included in the plant is equal to number of pools to be developed. The last packer section is between lower packer of next to last pool and one-way valve installed at flow string end.

EFFECT: possibility to optimize downhole plant parameters and to stimulate injection and/or fluid inflow simultaneously with plant installation.

8 cl, 1 dwg

FIELD: oil and gas production, particularly well interior separation for reservoir isolation one from another.

SUBSTANCE: device comprises packing members with elastic collars and reaming members, seating tool connected to lifting pipes and having lower part telescopically put on technological pipe, anchor, well screen and check valve. Each reaming member except for upper one is connected to body of each next upper packing member from below through intermediate pipe or pipes. Lower packing member body is secured to support pipes. Well screen is included in support pipe and/or one or several intermediate pipes opposite to each reservoir to be developed or treated. Check valve is located over upper well screen. Reaming member is made as thrust secured to telescoping pipe. Thrust of upper packing member has inner cavity and is connected to upper telescopic pipe by shear members so that the thrust may slide with respect to the pipe in axial direction. Thrust sliding is limited by upper annular widened section of upper telescopic pipe arranged inside thrust. Anchor is located over upper packing member thrust.

EFFECT: possibility to operate in wells having non-calibrated inner diameter, increased air-tightness of well interior separation.

2 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: method involves introduction of common flexible tubing string to the well bore with annular space formed around flexible tubing string; activation of the device for separation of zones for isolation at least of one well bore zone; direction of test fluid medium to well bore through flexible tubing string to location place above the aforesaid zone; removal of outlet fluid medium from isolated zone and test fluid medium from flexible tubing string through annular space; measurement of characteristic of flow rate and pressure of outlet fluid medium during discharge.

EFFECT: isolation and test of separate zones without removing operating tubing string.

20 cl, 15 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: prior to sealing, bed is temporarily locked by self-decomposing after checking the bottom packer tightness. The following components are assembled at well mouth, from bottom to top: bottom packer, pipe in length exceeding intervals of disturbance, top packer, left adapter and two-way valve. Said set is downed at setting tool into oil string in its sealing interval. Then, packers are simultaneously set. Thereafter tightness of top and bottom packers setting is tested by decreasing the fluid level in oil string by swabbing relative to setting tool. Note here that, first, bottom packet setting tightness is tested and, then, that of the top packer. In case setting of both packers is tight, setting tool is rotated clockwise to withdraw it with two-way valve from oil string to the surface. In case even one of said packers leaks, both are withdrawn. Thereafter, abode described jobs of temporarily blocking, downing, setting and testing are performed.

EFFECT: higher efficiency, simplified procedure.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: double-packer pump unit includes a pipe string of a lesser diameter placed concentrically or eccentrically in a pipe string of a larger diameter. The pipe string of the larger diameter is equipped with the lower and upper packers with a cable input mounted over an electrically driven pump and a return valve. Below the lower packer and over the upper packer the lower criss-cross flow coupling, the lower drain valve and the upper criss-cross flow coupling, the upper drain valve are installed respectively. A control cable, for example, a fibreglass cable, may be laid along the whole equipment and through the packers. A circulation valve and a balancing valve are installed between the lower and upper packers. Above the drain valve the double-packer pump unit is equipped with a disconnector with a hydraulic anchor mounted above it.

EFFECT: improved operational efficiency of the unit and increased reliability of the circulation valve.

4 cl, 4 dwg

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