Well expandable screen

FIELD: oil and gas industry.

SUBSTANCE: invention is related to equipment used for oil production, and namely, to well expandable screens. The screen is comprised of a support tube with longitudinal slots cut evenly in the circumferential direction with a larger base faced inside and a lesser base faced outside. A swelling elastomer is placed to the slots, on top of the elastomer there are filtering rack brushes retractable outside when the elastomer is swelled out. The body shape of the rack brushes meets the shape of the longitudinal slot while the width of the body exceeds the width of the slot lesser base.

EFFECT: simplified construction, improved capacity of a submersible pump.

3 cl, 6 dwg

 

The invention relates to submersible equipment, namely to expanding downhole filters (SRF), placed in the interval of the production casing perforations (EC) to reduce the ingress of particles of rocks from the bottom-hole formation zone (PPP).

Known SRF, consisting of a perforated casing, torsion springs and several layers of longitudinally corrugated mesh extending in the radial direction in the promotion of a spring (patent RF №2244103, EV 43/08, 2005).

The disadvantage of this SRF is the likelihood of the incomplete unfolding of the corrugations and the preservation of the gaps between the grid and the EC due to the limited stiffness of the spring. Because of the movement in the remaining gaps of the rock particles is the destruction of the PPP.

Known SRF that contains the support pipe with a plurality of longitudinal slits and attached thereto overlap each other in the axial and circumferential direction of the filter leaves in the form of an iris diaphragm (patent RF №2197600, EV 43/08, 1998). Known SRF, including supporting tube with multiple perforations, drainage and filtering shell of metal mesh, wire warp and weft, which are arranged at an angle to the longitudinal axis (U.S. patent No. 6607032, EV 43/08, 2003).

The disadvantage of the SRF is to use expanding cone to increase the diameter of the support pipe, capable of�to take in the wholeness of materials of filter sheets or membranes and their ability to arrest particles.

Known SRF, comprising a perforated body, a cylindrical casing with longitudinal slits and filter vane curved shape, one end of which is fixed to the case, and the opposite end extends through the slot in the housing (patent RF №2289680, EV 43/08, 2006).

The disadvantage of this SRF is limited Flexural rigidity of the filter of the blades and, consequently, their loose fit to EK and the movement of rock particles through overt perforation of the PPP in the well.

Known SRF, including rod and impaled on her brush wheels with an outer diameter exceeding the inner diameter of EK (Patent RF №103842, EV 43/08, 2011).

The disadvantage of the SRF is a high probability of abrasion and fracture of the bristles of the brush discs on the wall EK at round-trip operations and, as a result, the form between them an annular gap which eliminates the overlap of the bristles of the perforations in the EC.

The closest in technical essence to the claimed is the SRF that contains the support pipe with holes, attached the filter round brush in the form of a cylindrical perforated casing and radially oriented bundles of bristles exceeding in diameter the inner diameter of the EK, and the disconnector of the annulus, the top-mounted (Pat. OF THE RUSSIAN FEDERATION NO. 2504643, EV 43/08, 2014).

The disadvantage of p�intago a prototype SRF is for its descent into the well in use protective cover to prevent contact and abrasion of the bristles against the wall EK, the probability of the subsequent removal of the cover decreases with increasing length of the SRF and the depth of the well. In addition, for directing the purified water at the intake of the submersible pump after SRF necessary disconnector annulus, which complicates the installation of the SRF.

The present invention is to simplify the design of the SRF and technologies of arrangement of them well.

Said technical result is achieved in that in expanding downhole filter containing the support pipe and filter brush with radially oriented bundles of bristles according to the invention uniformly circumferentially on the support tube with a slotted longitudinal grooves with a large base on the inside and smaller on the outside, laid in the grooves swellable elastomer, and on top of it entered the filter brush rack, is able to stand out at swelling of the elastomer, wherein the hull form of a rack and pinion brushes conforms to the shape of a longitudinal groove, and a width greater than the width of the smaller base of the groove.

In addition, the longitudinal grooves may be trapezoidal or T-shaped cross-section.

Fig. 1, 2 shows the proposed SRF before and after running in the hole, the cross-section; Fig. 3, 4 - same, longitudinal�diesel section; Fig. 5, 6 - embodiments of longitudinal grooves and filter rack brushes in them.

SRF contains the support pipe 1 is uniformly distributed along the circumference of the open longitudinal grooves 2, for example with a trapezoidal cross-section, facing a large base 3 inside and the lower base 4 is exposed (Fig. 1, 5). At the bottom of each longitudinal groove 2 close to the side walls provides a swellable elastomer 5, and on top of it with the technological gap of 6 relative to the side walls of the groove 2 is entered the filter brush rack 7 (Fig. 5). Rack brush Assembly 7 consists of a body 8 and tufts of bristles 9. The housing 8 has a trapezoidal cross-section shape corresponding to the shape of a longitudinal groove 2, the width of the housing 8 is greater than the width of the smaller base 4 of the groove 2, which prevents the loss of it brushes 7 (Fig. 5). Extension capability batten brush 7 in the radial direction at swelling of the elastomer 5 is achieved by sampling the technological gap 6 (Fig. 2). In an embodiment, the longitudinal grooves having T-shaped cross section used rack brush 7 with the housing 8 such T-shaped, injected with the technological gap of 6 relative to cervical groove 2 (Fig. 6). Belt brushes 7 are made of materials resistant to the effects of the reservoir fluid and chemical agents, prima�aamah for the well treatment. The distance between the tufts of bristles 9 along the length of the housing 8 is selected from the conditions of formation of the free ends of the bristles continuous brush fields (Fig. 3). In the circumferential direction between the rack and pinion brushes 7 remain the longitudinal channels 10, widest near the support pipe 1 (Fig. 1, 2). The density of the bristles 9 in the beam affects the size of the detainees of their rock particles. In the initial state, the outer diameter of the SRF on the tufts of bristles 9 is less than the internal diameter of EK 11 on the size of the annular gap 12 (Fig. 1, 3), which eliminates the possibility of their mutual contact during the descent into the well, that is until the swelling elastomer 5 in the reservoir fluid. Longitudinal grooves 2 is plugged at the ends with restrictive elements (not shown), eliminating swelling of the elastomer in the axial direction.

SRF operates as follows.

SRF is suspended by pipe 1 to the base of the submersible motor without any additional devices and lowered into the interval of the perforations 13 of the EC 11. During the descent of the bristles 9 of the rack 7 brushes wear out about the EK wall 11 through the annular gap 12 between them (Fig. 3). In the well formation fluid penetrates through the gaps 6 in the longitudinal grooves 2 and comes into contact with the swellable elastomer 5. The latter, being hampered large base 3 and side walls of a longitudinal groove 2, as well as restrictive e�cops at the ends, increases in size when the swelling in the only possible direction - outwards to lower the base 4 of the groove 2 (Fig. 2, 4). Due to the sampling of the technological gap 6 of the elastomer 5 moves in front of him brush rack 7 until the stop of the shell 8 in the side walls of the longitudinal groove 2. At the same time with a gap of 6 disappears annular gap 12 and the tufts of bristles 9 rest on the wall EK 11, and then penetrate into the perforations 13 and block their cross-section (Fig. 2, 4).

When you turn on the submersible pump reservoir fluid, the particles of the breed moves from the PPP for perforation channels 14 to the perforations 13 in the EC 11. The largest particles collide and get stuck between the bristles 9, intruded into the perforations 13, which is located in EK 11 (Fig. 2, 4). From trapped particles formed stable due to the bristles 9 natural filter with improved filtration properties, which over time increases in volume and fills the perforation channels 14. This reduces the number of submitted from the PPP particles of rocks and remains well productivity. After filtration through appearing in the bundles of bristles 9 natural filter purified liquid flows into the longitudinal channels 10 within the support pipe 1 changes the direction by 90° and moves the intake submersible pump. Subsequent pumping of ocienvcreate reduces wear and increases the life of the submersible pump.

Thus, the proposed SRF eliminates the use of additional devices in the form of a protective cover and disconnector annulus, reducing costs and installation time and increases reliability.

1. Borehole extending the filter containing the support pipe and filter brush with radially oriented bundles of bristles, characterized in that the uniformly circumferentially on the support tube with a slotted longitudinal grooves with a large base on the inside and smaller on the outside, laid in the grooves swellable elastomer, and on top of it entered the filter brush rack, is able to stand out at swelling of the elastomer, wherein the hull form of a rack and pinion brushes conforms to the shape of a longitudinal groove, and a width greater than the width of the smaller base of the groove.

2. Borehole extending the filter according to claim 1, characterized in that the longitudinal grooves have a trapezoidal cross-section shape.

3. Borehole extending the filter according to claim 1, characterized in that the grooves are T-shaped cross section.



 

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FIELD: oil-and-gas industry.

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