Well filtering device

FIELD: oil and gas industry.

SUBSTANCE: device comprises a body with upper inlet openings, a discharge pipe placed coaxially to the body, with a section of radial openings and a safety valve at the lower butt end, an auger put on to the discharge pipe, a slotted filter covering the section of radial openings of the discharge pipe and a container below the body. The discharge pipe is installed inside the body and the auger is placed between the upper inlet openings and the slotted filter.

EFFECT: improved operational life, maintained stable capacity of the device.

3 cl, 3 dwg

 

The invention relates to oil submersible equipment, namely the downhole filtration device, preventing particles of solids in the electrical submersible pump.

Known downhole filter containing nipple and coupling part and a slit filter element in the form of a wound on the longitudinal ribs of profiled wire (U.S. Pat. NO. 2374433 RF, E21B 43/08, 2009).

The disadvantage of the downhole filter is the ability to quickly clogging a single slot of the filter element and the subsequent termination of receipt of treated produced fluid intake of the submersible pump.

Known downhole separator, comprising a housing with inlet holes, concentric installed in the housing of the discharge pipe, screw centrifugal cleaning in the annular cavity between the casing and the discharge pipe and the collection of impurities (Yakimov, S. B. and other Use of desender protection of ESP on the layers of the pokur Suite // Innovator. 2009. No. 27. S. 27-31).

Downhole separator is characterized by a high uptime, but its disadvantage is unstable separation ratio, dependent on the specific volume of the produced fluid and the size of the contained particles of impurities.

Known downhole filtration device containing a tubular frame, the upper end of which is connected with PA is robcom, and the lower end buried in the sump, the slot filters, concentric installed outside and inside the tubular frame and forming with it the outer vertical channels, hermetically closed at the top and connected to the tank bottom, and an internal vertical channels, sealed at the bottom and connected to the pipe at the top, and the valve that separates the internal cavity slotted filter from the pipe (U.S. Pat. NO. 2446274 RF, E21B 43/08, 2012). Downhole filtration device has an increased life time due to double purification of produced fluid in concentric installed slot filters and opening the safety valve after their clogging. However, this device does not restore throughput gap filter during operation.

Known filter downhole device containing reference perforated pipe, which is equipped with slotted filters consisting of longitudinal prismatic cores and wound them prismatic profile with the formation of gaps between the coils and between the adjacent slit filters inside the supporting pipe placed safety valves, the characteristics of which are selected from the condition of the sequential opening of the valves from the top down (U.S. Pat. NO. 133561 RF, E21B 43/08, 2013).

The disadvantage of filtering the downhole device is the tsya the complexity of setting the valves on individual opening pressure, as well as the inability to regenerate all gap filters.

Known filter downhole device comprising a split annular wall and communicating through outlet tube upper and lower sections, and the collection of impurities in the bottom section has a radial inlet holes and screw covering the outlet pipe and the upper section of the discharge pipe is made with perforations covered by a filter, above which is placed a relief valve, a radial bore and has an axial outlet (U.S. Pat. NO. 116571 RF, E21B 43/08, 2011).

A disadvantage of the known filter downhole device is the lack of regeneration of the filter, because the safety valve placed at the outlet of the upper section, i.e. a filter in the direction of movement of the liquid.

As a prototype made downhole filter device containing a discharge pipe, the bottom of which is covered by a screw equipped with a safety valve on the end and is enclosed in a housing with inlet holes at the top and attached to the container bottom and the upper part is made of a perforated and surrounded welded slot filter, consisting of the inner support layer in the form of longitudinal prismatic profiles and outer filter layer in the form of a winding of the prismatic profile (P is so NO. 131070 RF, E21B 43/08, 2013).

The disadvantages of the filter downhole devices are unstable throughput, decreasing as clogging of the slit in a slit filter, and inefficient use of auger performing centrifugal cleaning of the reservoir fluid only when you open the relief valve during regeneration slotted filter. The disadvantages include the fact that when regeneration of the filter surface is difficult slippage of suspended particles, because they are held in the gap, relying on the edges of the wound, and this adversely affects the lifetime of the device. In addition, the container accumulate particles separated on the auger, while particles with slotted filter reset when the regeneration of the sump wells, which will require them to retrieve.

The present invention is directed to maintaining a stable throughput and increase the service life of the filter downhole device by simultaneously cleaning the reservoir fluid in a slit filter and removal of suspended particles from mechanical impurities from the filter layer. In addition, the inventive filter downhole device eliminates Parisiana sump wells, mechanical impurities, which lengthens the period between overhauls.

This technical result DOS is ikaetsya fact, that filter downhole device, comprising a housing with a top inlet holes located coaxially to the housing outlet pipe with a plot of radial holes and a safety valve on the bottom, auger mounted on the discharge pipe, slotted filter in the form of the inner support and the outer filter layer of prismatic profile, the overlapping area with the radial holes of the discharge pipe, and at the bottom of the container body, according to the invention, a suction pipe mounted inside the housing, and the screw is placed between the upper inlet holes and a slit filter.

Preferably execute slotted filter with internal reference layer in the form of district prismatic profiles and outer filtration layer of longitudinal prismatic profiles, forming between them a longitudinal slit, a cylindrical circumferential surface parallel profiles from the discharge pipe can be made of longitudinal slits.

In addition, the discharge pipe can be additionally equipped with at least one screw and one slot filter, with screws and slotted filters are arranged in alternating order.

In Fig.1 schematically shows the inventive filter downhole device with one screw and slot filter on the outlet pipe of Fig.2 - the same, what about the two screws and slotted filters; in Fig.3 is shown a cross section of the device.

Filter downhole device includes a housing 1 with an upper inlet holes 2 in the wall that is attached to the container 3 (Fig.1). Inside the housing 1 coaxially installed discharge pipe 4, having a relief valve 5 on the bottom and above the area with the radial holes 6. On the discharge pipe 4 below the upper inlet 2 fitted screw 7. Below the screw 7 of the discharge tube 4 is covered slot filter 8, the overlapping part with the radial holes 6. The geometric size of the screw defining its separation properties are chosen according to the estimated fractional composition of impurities in the reservoir fluid. Between the slot filter 8 and the casing 1 has an annular gap 9.

Slotted filter 8 comprises an inner supporting layer in the form of district prismatic profiles 10, to which is welded and which are based longitudinal prismatic profiles 11 forming the outer filter layer with equal longitudinal slots 12 (Fig.1, 3). Depending on the requirements of the clean reservoir fluid received at the receiving ESP, the width of the longitudinal slots may be selected from the interval of 100 to 1000 μm. The distance between the circumferential profile 10 is from the condition of conservation of longitudinal straightness p what Ofili 11 for any pressure drop across the slit filter 8. Between the discharge pipe 4, the longitudinal profiles 11 and the adjacent circumferential profiles 10 an annular cavity 13, each of which overlaps completely or partially, at least one hole 6 on the outlet pipe 4. This ensures the smooth flow in the outlet pipe 4 of the reservoir fluid passing through the sections of the filter layer located above the annular cavity 13. Additionally, on the inner surface of the circumferential profiles 10 adjacent to the outlet pipe 4 may be made of longitudinal slots 14, telling the annular cavity 13 between them.

To increase throughput while maintaining the quality of cleaning in some embodiments, the filtration performance of the downhole device is additionally equipped with at least one auger 15 and one slot filter 16, which are located on the outlet pipe 4 in alternating order, with the screw 7 and a slit filter 8 (Fig.2).

Filter downhole device operates as follows.

When you enable ESP (not shown), the reservoir fluid with particles of mechanical impurities different dispersion enters through the top of the inlet 2 into the space between the wall of the housing 1 and the discharge pipe 4 and moves down along there auger 7, acquiring rotational motion (Fig.1). Due to the resulting center of the foreign forces coarse particles are shifted in the outer part of the fluid flow, that is, to the wall of the housing 1, and the fine particles remain in the inner part near the discharge pipe 4.

After the passage of the screw fluid flow is separated into fractions by particle continues to move down and into the annular gap 9 between the slot filter 8 and the wall of the housing 1. Moving in the peripheral part of the liquid flow to larger particles with inertia by slotted filter 8 and under their own weight fall into the container 3. Purified from large particles fluid merges with the current along the slotted filter 8 by the flow of the liquid with smaller particles together and filtered through longitudinal slots 12 (Fig.3), while particles larger than the width of the slit, are trapped between the longitudinal profiles 11. The purified liquid enters the annular cavity 13, where through holes 6 passes inside of the discharge pipe 4 and leaves the filter downhole device. The slots 14 in the County profiles 10 equalize the pressure in the annular cavity 13, thereby eliminating the deformation of the longitudinal profiles 11. The safety valve 5 at this stage of the operation of the device is closed.

Delayed particles are held between the longitudinal profiles 11 due to the clamping action of the radial stream of fluid flowing in the slotted filter 8. As the overlap of the adhered particles of food is lnyh slits 12 radial fluid flow through them is waning, that reduces the force holding the particles in the aperture of the filter 8. Simultaneously with the weakening of the radial flow increases the rate of downward flow of liquid in the annular gap 9. Under its influence, and gravity delayed particles slide along the longitudinal profile 11 down off of the filter layer slotted filter 8 and is deposited in the container 3. The described process is the more intense, the greater the thickness of the detainees particles. Due to the continuous purification of the slits 12 of the detainees particle throughput and filtration capacity slotted filter 8 are supported almost unchanged.

In the case of instantaneous release of rock particles from the formation into the well and fast clogging of the longitudinal slots 12 permeability slotted filter 8 is sharply reduced. This leads to the creation of a vacuum inside the discharge pipe 4 and increase acting on the safety valve 5 pressure as the cavity of the housing 1 remains communicated with the hole through the top of the inlet 2. Upon reaching a pre-set pressure of the safety valve 5 is opened and fluid under pressure enters the supporting tube 4. Resulting in the support pipe 4 hydraulic shock is passed through the holes 6 in the annular cavity 13, causing the separation of particles adhered on the outside p is dolnych profiles 11, and their deposition in the container 3. In the disclosure of longitudinal slots 12, the differential pressure between the cavities of the housing 1 and the support pipe 4 drops to its original value, the safety valve 5 is closed and the movement of the reservoir fluid through the slit filter 8 is resumed.

If the filter downhole device has two screw 7, 15, and two slotted filter 8, 16, in an alternating located on the discharge pipe 4, it is received in the housing 1, the reservoir fluid is first filtered by the upper pair of auger 7 - slot filter 8 (Fig.2). In this part contained in the liquid fine particles is delayed by a slit filter 8, and the larger particles move with the fluid flow down to the second auger 15. On the auger 15 is repeated fractionation of the remaining liquid particles in the cross section of flow, then the smallest of them linger on a slit filter 16, and the largest particles are deposited under the influence of gravity into the container 3. With the gradual contamination of the gap filter 8, 16 demolition of suspended particles and the release of longitudinal slits 12 occurs simultaneously on both of them, but with different intensity, which is proportional to the velocity of fluid flow in the gap 9. Opening of the safety valve 5 happens after a sudden overlapping particles longitudinal slits 12 at about the both gap filter 8, 16, after which the anchor tube 4 and communicating with her ring cavities 13 hydraulic shock occurs, which pushes out particles stuck between the longitudinal profiles 11. In the throughput and filtration capacity gap filter 8, 16 restored. Thanks to the double centrifugal cleaning of the reservoir fluid at the augers 7, 15 and its filtration through two slotted filter 8, 16 increases the service life continuous operation of the downhole filtration device as a whole, since this reduces the number of particles per slot filter.

1. Filter downhole device, comprising a housing with a top inlet holes located coaxially to the housing outlet pipe with a plot of radial holes and a safety valve on the bottom, auger mounted on the discharge pipe, slotted filter in the form of the inner support and the outer filter layer of prismatic profile, the overlapping area with the radial holes of the discharge pipe, and at the bottom of the container body, characterized in that the outlet pipe is mounted inside the housing, and the screw is placed between the upper inlet holes and a slit filter.

2. Filter downhole device under item 1, characterized in that the inner support layer slotted filter is made in the form of district PR is somaticheskih profiles and the outer filter layer formed of longitudinal prismatic profiles, forming between them a gap, while on the circumferential surface of prismatic profiles from the discharge tube is made of longitudinal slits.

3. Filter downhole device under item 1, characterized in that the outlet pipe is additionally equipped with at least one screw and one slot filter, with screws and slotted filters are arranged in alternating order.



 

Same patents:

Well screen // 2540748

FIELD: oil and gas industry.

SUBSTANCE: device includes polymer fibrous screening filter element made as separate sections interconnected along outer perimeter by metal tie rods, which are screwed into subpump sleeve or end sleeve at one side and to batwing-shaped sleeve at the other side and one butt end of the filtering element is thrusted to its inner wing. The second butt end of the filtering element is thrusted to end sleeve or subpump sleeve, where valve element is made as feedthrough opening shaped as two cylinders with different base diameter installed one above another, with a gate corresponding in its configuration to the above feedthrough opening. Attachment reliability of the filtering element sections is ensured by double nuts.

EFFECT: improved efficiency of the well screen operation due to increased service life of filtering elements, in particular valve element, simplified movement of its gate.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the oil industry and can be used in multi layered reservoir development with horizontal wells. The method involves recovering the pools as the productive formation intervals along the horizontal bore of the development well. Filtered pipe strings are lowered. The horizontal well bore is sectioned with packers. The well production is separated. That is followed by the production selection and water injection. The formation is sectioned according to a permeability value. If the sections differ more than twice as much, water-swellable packers are arranged at the section boundaries. A filter inside is provided with a solid horizontal partition extending along the whole filter. This partition is used to separate upper and lower portions of the filter. The partition has a hydrophilic surface having a degree of hydrophility of no less than 99%. Capillary holes have a diameter of no more than 2 mm. The holes density is not less than 50 holes/m. A horizontal position of the partition is controlled by sensors mounted at an inlet and an outlet of the filter. An upper portion of a filter wall is perforated, while a lower portion is solid. A water portion is reduced in a liquid supplied from the well bore through the upper portion of the filter. The water is injected through the hydrophilic surface and capillary holes into the lower portion of the filter. In front of the perforations of the filter, the packer is mounted to cut off an annular space of the well. The lower portion of the filter has holes for water outflow into the annular space. The above water is pumped into another formation. The lower portion of the filter is not connected to the piping string, whereon the filter is lowered. The upper portion of the filter is connected to the pipe string. The low-water fluid is supplied from the upper portion of the filter into the pipe string, which is brought up by means of a pump.

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FIELD: oil-and-gas industry.

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FIELD: mining industry, particularly water, oil or gas well equipment.

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Well filter // 2256780

FIELD: oil industry, particularly means to prevent sand appearance in well and sand ingress into acting well pump.

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EFFECT: simplified structure, increased reliability of filter installation and operation.

1 dwg

Well screen // 2258131

FIELD: oil production industry, particularly devices preventing ingress of formation sand and propane with extractable formation fluid from bottomhole formation zone into well.

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EFFECT: increased filtering performance.

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Borehole filter // 2258786

FIELD: mining industry, particularly equipment for water intake, oil and gas wells arranged within the interval of production bed made up of soft rock.

SUBSTANCE: borehole filter includes perforated body, filtering jacket made of independent sections with wire winding, packing members and end sleeves connected to perforated body. Filtering jacket is formed of easy-drillable material, for instance of polyethylene or propylene. End sleeves are connected with perforated body by means of shear pin. Packing members of filtering jacket are made as perforated tubes connected to end sleeves. Perforated body has solid outer surface and provided with blind tube having double connection coupling including outer member having tool-joint thread hand orienting in the same direction as that of perforated base, and inner member having opposite tool-joint thread hand.

EFFECT: improved maintainability and increased efficiency of well repair.

3 cl, 1 dwg

Well filter // 2259472

FIELD: mining and oil- and gas-production industry, particularly for oil well development.

SUBSTANCE: well filter has tube with orifices arranged in helical rows on tube side and shear plugs installed in the orifices. Filter also has at least one filtering net and protective case, which are concentric to the tube. The case comprises orifices and is composed of several sheets located in end-to-end mode along the full tube length. Longitudinal butts between the sheets and orifice rows of adjacent sheets are mutually displaced in circumferential direction. Orifices made in protective case and in tube may be shifted one relative another. Ends of the case and filtering net may be closed with limiting rings secured to the tube. Filtering net with fine cells may be installed between two layers of nets with coarse cells. Plugs may be hollow. Total area of orifices made in protective case may exceed cross-sectional area of the tube.

EFFECT: increased oil recovery, filter performance and efficiency of extractive product cleaning of contaminants.

6 cl, 3 dwg

FIELD: oil and gas wells, particularly to reduce longitudinal fluid flow through hole annuity.

SUBSTANCE: method involves installing at least one resilient sealing ring around permeable pipe before lowering thereof into the well; holding the ring into compressed state around the pipe with the use of band or/and binding member which is gradually solved in well medium; installing permeable pipe in supply well area; providing band or/and binding member solving to provide expansion of at least part of sealing ring in radial direction in hole annuity surrounding permeable pipe. Sealing device has a number of sealing rings spaced equal intervals and installed on permeable pipe inside the well. Each sealing ring has one end permanently connected with outer pipe wall and another resilient end formed as a flange.

EFFECT: increased efficiency.

6 cl, 4 dwg

FIELD: well drilling and completion.

SUBSTANCE: device has expansible tube having wall with a number of through cuts. Some cuts are formed of bent compressed members and may expand in radial direction. Expansible means has bistable cells creating tubular structure. Each expansible cell has thick compressed member and bent pliable link, which may be converted into expanded state. Axial tube length is constant during tube expansion. Expansible system comprises means connected to communication line for information receiving.

EFFECT: reduced force for tube expansion from radially compressed state.

49 cl, 45 dwg

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