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CN-113738288-B - Sand control well completion structure of easy pull-out underground sand control pipe column

CN113738288BCN 113738288 BCN113738288 BCN 113738288BCN-113738288-B

Abstract

The invention belongs to the technical field of petroleum exploitation, in particular to a sand control well completion structure with an easily pulled-out underground sand control pipe column, which comprises a loose sandstone stratum, a spacer filling layer and a sand control pipe column, wherein a wellhead is arranged in the loose sandstone stratum, the sand control pipe column is arranged in the wellhead, the spacer filling layer is arranged in the periphery of the sand control pipe column and is positioned in the wellhead, a positioning mechanism is arranged at the upper end of the wellhead, a packing mechanism is arranged at the upper end of the positioning mechanism, the positioning mechanism comprises a seat ring, a limiting plug cylinder and a positioning slide cylinder, wherein the bottom end of the seat ring is fixedly connected with the limiting plug cylinder, the limiting plug cylinder is mutually plugged with the upper end of a wellhead, and the positioning slide cylinder is arranged in the limiting plug cylinder.

Inventors

  • LI BIN
  • ZHANG WENJIE
  • WANG NINGFEI

Assignees

  • 陕西三丰石油科技有限公司

Dates

Publication Date
20260508
Application Date
20210907

Claims (9)

  1. 1. The sand control well completion structure of the underground sand control pipe column easy to pull out comprises a loose sandstone stratum (26), an isolating body filling layer (27) and a sand control pipe column (28), and is characterized in that a wellhead is arranged in the loose sandstone stratum (26), the sand control pipe column (28) is arranged in the wellhead, the isolating body filling layer (27) is arranged in the periphery of the sand control pipe column (28), a positioning mechanism (1) is arranged at the upper end of the wellhead, a sealing mechanism (9) is arranged at the upper end of the positioning mechanism (1), the positioning mechanism (1) comprises a seat ring (2), a limiting plug cylinder (6) and a positioning slide cylinder (8), the bottom end of the seat ring (2) is fixedly connected with the limiting plug cylinder (6), the limiting plug cylinder (6) is mutually inserted with the upper end of the wellhead, a positioning slide cylinder (8) is fixedly connected with an upper scraping ring (14), the bottom end of the positioning slide cylinder (8) is fixedly provided with a lower ring (15), a plurality of scraping balls (16) are fixedly connected with the inner end part (16) of the rolling ball (16), and upper and lower adjacent oil pipe (18) has been seted up between rolling groove (16), a plurality of oil pipe (19) have been seted up around the inside upper end of location slide (8), just oil pipe (19) communicate with each other with oil pipe (18) are inside, seal and separate mechanism (9) including shutoff circle (10) and shutoff ring (12), the bottom mounting of shutoff circle (10) has shutoff ring (12), just shutoff ring (12) card is in the space between seat circle (2) and location slide (8).
  2. 2. The sand control well completion structure of an easily pulled out underground sand control tubular column according to claim 1, wherein the left end and the right end of the middle position of the two sides of the seat ring (2) are fixedly connected with a lower grip (3), a limit concave hole (24) is formed in the upper end of one side of the lower grip (3), the left end and the right end of the middle position of the two sides of the plugging ring (10) are fixedly connected with an upper grip (11), the bottom end of one side of the upper grip (11) is fixedly connected with a limit clamping shaft (25), and the limit concave hole (24) is mutually clamped with the limit clamping shaft (25).
  3. 3. The sand control well completion structure of an easily pulled-out underground sand control pipe column according to claim 1, wherein a plurality of limit inserts (4) are fixedly connected to the bottom end of the seat ring (2), and the limit inserts (4) are of conical structures and are mutually inserted into a loose sandstone stratum (26).
  4. 4. The sand control well completion structure of an easily pulled-out underground sand control pipe column according to claim 3, wherein the bottom end of the seat ring (2) is mutually attached to the upper end of a loose sandstone stratum (26), a damping washer (5) is fixedly connected to the inside of the upper end of the seat ring (2), the damping washer (5) is a rubber component, the bottom end of the plugging ring (10) is mutually attached to the upper end of the seat ring (2), and the bottom end surface of the plugging ring (10) is in elastic contact with the damping washer (5).
  5. 5. The sand control well completion structure of the underground sand control pipe column easy to pull out according to claim 1, wherein a plurality of connecting rods (7) are arranged between the limiting plug cylinder (6) and the positioning slide cylinder (8), and two ends of the connecting rods (7) are fixedly connected with the inner wall of the limiting plug cylinder (6) and the outer wall of the positioning slide cylinder (8) respectively.
  6. 6. The sand control well completion structure of an easily pulled out underground sand control pipe column according to claim 1, wherein the sections of the upper scraping ring (14), the lower scraping ring (15) and the reinforced scraping head (23) are all triangular structures, and the reinforced scraping head (23) is a manganese steel member.
  7. 7. The sand control well completion structure of an easily pulled-out underground sand control pipe column according to claim 1, wherein a plurality of connecting strips (20) are fixedly connected to the periphery of the outer wall of the upper end of the positioning sliding cylinder (8), a blocking block (21) is fixedly connected to one side of each connecting strip (20), a blocking plug (22) is fixedly connected to the bottom end of each blocking block (21), and the blocking plug (22) is mutually embedded with the upper end of the oil injection pipe (19).
  8. 8. The sand control well completion structure with easy pull-out downhole sand control string as set forth in claim 7, wherein the connection strips (20) and the plugs (22)) are rubber members.
  9. 9. The sand control well completion structure of the underground sand control pipe column easy to pull out according to claim 1, wherein the upper end of the plugging ring (10) is fixedly connected with a reinforcing rib ring (13), and the inner wall of the reinforcing rib ring (13) is mutually attached to the outer wall of the positioning slide cylinder (8).

Description

Sand control well completion structure of easy pull-out underground sand control pipe column Technical Field The invention belongs to the technical field of petroleum exploitation, and particularly relates to a sand control well completion structure with an easily-pulled underground sand control pipe column. Background The oil and gas field has a large amount of loose sandstone oil reservoirs easy to produce sand, and for oil and gas wells of the loose sandstone oil reservoirs, whether the oil and gas wells are vertical wells, inclined wells or horizontal wells, the sand production of an oil well is one of the problems frequently encountered in oil field development, so that the prevention of sand production of a subsurface layer is extremely important, and currently, two common mechanical sand prevention technologies for the oil and gas wells are that one sand prevention pipe column is arranged in the oil and gas well for sand prevention, the other sand prevention pipe column is arranged in the oil and gas well for sand prevention, gravel is filled in the annular space of the sand prevention pipe column and the well wall, and the gravel layer is utilized for blocking stratum sand from entering a shaft, so that huge friction resistance is generated between the stratum sand or the gravel and the sand prevention pipe column tightly held by the stratum sand or the gravel during pipe drawing operation, and the operation is inconvenient. In the prior art, the Chinese patent publication No. CN201320799528.0 discloses a sand control well completion structure of an underground sand control pipe column which is easy to pull out, the invention establishes a permeable isolator with low resistance to the pipe column when lifting the pipe column up in an annulus between a well wall and the sand control pipe column, when the pipe column is lifted, the friction resistance between the separator and the pipe column is very low, and the pipe column can be easily pulled out. However, the sand control well completion structure of the underground sand control pipe column is easy to pull out in the prior art, and the defect that the sand control pipe column and the wellhead are not well positioned is overcome in the using process, so that the sand control pipe column in the wellhead is easy to deflect, the thickness of a filled spacer filling layer around the sand control pipe column is uneven, stable pulling-up of the sand control pipe column is affected, spacer particles in the spacer filling layer are adhered to the periphery of the outer wall of the sand control pipe column in the wellhead when pipe pulling operation is carried out, the spacer particles on the periphery of the outer wall of the sand control pipe column are not easy to clean, inconvenience is brought to subsequent maintenance and next use of the sand control pipe column, moreover, the sealing effect of the upper end of the spacer filling layer after filling is not good, the upper part of the spacer filling layer is not well protected, external flying sand is easy to enter the spacer filling layer from the upper part of the spacer filling layer, the spacer particles filled into the spacer filling layer are mixed with the spacer particles in the spacer filling layer, and repeated use of the spacer particles in the spacer filling layer is increased. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a sand control well completion structure which is easy to pull out an underground sand control pipe column and has the characteristics of simple positioning, convenient wall scraping and quick packing. The sand control well completion structure comprises a loose sandstone stratum, a spacer filling layer and a sand control pipe column, wherein a wellhead is arranged in the loose sandstone stratum, the sand control pipe column is arranged in the wellhead, the spacer filling layer is arranged in the periphery of the sand control pipe column, a positioning mechanism is arranged at the upper end of the wellhead, the upper end of the positioning mechanism is provided with a sealing mechanism, the positioning mechanism comprises a seat ring, a limiting plug cylinder and a positioning slide cylinder, the bottom end of the seat ring is fixedly connected with the limiting plug cylinder, the limiting plug cylinder and the upper end of the wellhead are mutually inserted, the positioning slide cylinder is arranged in the positioning plug cylinder, the upper end of the positioning slide cylinder is fixedly connected with an upper scraping ring, the bottom end of the positioning slide cylinder is fixedly connected with a lower scraping ring, the ends of the upper scraping ring and the lower scraping ring are fixedly connected with a reinforcing scraping head, a plurality of rolling grooves are formed in the periphery of the positioning slide cylinder, the rolling grooves are movably connected with the inner sides of the rolling grooves,