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CN-122014170-A - Welding-free supporting disc and sand-proof screen pipe thereof

CN122014170ACN 122014170 ACN122014170 ACN 122014170ACN-122014170-A

Abstract

The invention discloses a welding-free support disc and a sand control screen thereof, wherein the support disc is sleeved and fixed on the outer circular surface of a base pipe (1), a sleeved hole of the support disc (2) is a conical hole (a), a conical gap (c) is formed between the conical hole (a) and the outer circular surface of the base pipe (1), a conical locking sleeve (3) which is consistent with the conical angle of the conical hole (a) is inserted into the conical gap (c), the support disc (2) is tightly expanded on the base pipe (1) through the conical locking sleeve, and the support disc is tightly expanded on the base pipe with a sand control filter section through the conical locking sleeve structure, so that the sand control screen is formed.

Inventors

  • TANG SHAOPENG
  • LI BOREN
  • CHEN GUANGLI
  • ZHU CHANGLIN
  • LIU HENG

Assignees

  • 思达斯易能源技术(集团)有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (6)

  1. 1. The welding-free supporting disc is sleeved and fixed on the outer circular surface of the base pipe (1), and is characterized in that a sleeved hole of the supporting disc (2) is a conical hole (a), a conical gap (c) is formed between the conical hole (a) and the outer circular surface of the base pipe (1), a conical locking sleeve (3) which is consistent with the conical angle of the conical hole (a) is inserted into the conical gap (c), and the supporting disc (2) is tightly expanded on the base pipe (1) through the conical locking sleeve (3).
  2. 2. The welding-free support disc according to claim 1, characterized in that a radial pin hole I (32) is arranged near the big end of the taper lock sleeve (3), a radial pin hole II (21) is arranged on the support disc (2), when the taper lock sleeve (3) is inserted into the conical gap (c), the radial pin hole I (32) is positioned at the outer side of the support disc (2), the taper lock sleeve (3) locks the taper lock sleeve with the base pipe (1) through a cylindrical pin I (4) inserted into the radial pin hole I (32), and the support disc (2) locks the taper lock sleeve (3) through a cylindrical pin II (5) inserted into the radial pin hole II (21).
  3. 3. The welding-free supporting disc according to claim 2, wherein the sleeved hole of the supporting disc (2) comprises a conical hole (a) and a cylindrical hole (b), the cylindrical hole (b) is arranged at the small end of the conical hole (a), and the cylindrical hole (b) is attached to the outer circular surface of the base pipe (1).
  4. 4. A solderless support disc according to any one of claims 1 to 3, characterized in that a corrugated conical surface (31) with elastic tension is formed close to the small end surface of the taper lock sleeve (3).
  5. 5. The welding-free support disc according to claim 4, wherein the outer diameter of the large end of the taper lock sleeve (3) is larger than the inner diameter of the large end of the taper hole of the support disc (2).
  6. 6. A sand control screen comprising a base pipe (1) and a sand control screen section (11) located on the base pipe (1), characterized in that the non-welded support disc (2) of any one of claims 1-5 is installed at both ends of the sand control screen section (11).

Description

Welding-free supporting disc and sand-proof screen pipe thereof Technical Field The invention belongs to the technical field of fixed protection of sand control screens in petroleum completion engineering, and in particular relates to a welding-free supporting disc and a sand control screen thereof. Background At present, the domestic ocean oil field is gradually changed from a land frame to a deep sea area, the depth of the oil well is increased, the well condition is more complex, the stratum condition is more severe, a plurality of high-temperature wells and high-pressure wells are formed, and the pH value of stratum fluid is stronger. The method for fixing and protecting the filtering unit, i.e. the sleeve in the existing sand control screen tube-composite screen tube is to install annular supporting plates at two ends of the sleeve, and the connection mode between the annular supporting plates and the sleeve adopts a welding process. The welded support disc is suitable for well conditions with good stratum conditions, such as oil wells with low pH value of stratum fluid, small stratum pressure and moderate temperature (not more than 200 ℃). For the conditions of high temperature wells, high pressure wells and high pH value of stratum fluid, the method cannot be adapted, and the reasons are mainly as follows: First, from the weld metal itself, the impurity elements in the weld metal, such as carbon, sulfur, phosphorus, oxide, etc., are enhanced in activity at high temperature and high pressure, and are extremely easy to chemically react with mineral ions in the strong acid-alkali liquid environment, so that (electro) chemical corrosion is caused to the weld metal. Secondly, the welding is a complex metallurgical process, and a supporting disc (the material is usually stainless steel) and a base pipe (the material is usually low alloy steel) which are connected with weld metal can undergo local metallurgical phase change reaction, and because the change rate of a welding thermal cycle curve is large, the change period is short, the temperature is rapidly increased (the highest temperature reaches 5000-8000K) and is rapidly cooled, crystal grains cannot be sufficiently refined and recombined, so that different metallographic structures are formed in a heat affected zone around the weld, the crystal grain size in the zones is uneven, the mechanical property is unstable, and hot cracks are easily caused at high temperature and high pressure. Thirdly, in general, heat treatment is required after welding, so that a weld joint and a heat affected zone of the weld joint can obtain a uniform and refined structure to improve the performance of the welded joint, but for the specific processing and assembly process of the composite screen pipe, the heat treatment of the support plate after the welding of the support plate is completed is impossible, so that welding defects cannot be avoided. Disclosure of Invention Aiming at the problems that the conventional welding process is insufficient in reliability of connection of the support disc and the base pipe in the well condition with severe conditions, and potential safety hazards are brought to underground sand control operation of the screen pipe, the invention provides the welding-free support disc and the sand control screen pipe thereof. The invention adopts the following technical scheme: In one aspect, the invention provides a welding-free supporting disc, which is sleeved and fixed on the outer circular surface of a base pipe, wherein a sleeved hole of the supporting disc is a conical hole, a conical gap is formed between the conical hole and the outer circular surface of the base pipe, a conical locking sleeve which is consistent with the conical angle of the conical hole is inserted into the conical gap, and the supporting disc is expanded on the base pipe by the conical locking sleeve. Further, be close to the big head end of tapering lock sleeve is equipped with radial pinhole I, be equipped with radial pinhole II on the supporting disk, the tapering lock sleeve peg graft in during the conical clearance, radial pinhole I is located the outside of supporting disk, the tapering lock sleeve pass through peg graft in cylindric lock I in the radial pinhole I with it with the base pipe locking, the supporting disk pass through peg graft in cylindric lock II in the radial pinhole II with it with tapering lock sleeve locking. Preferably, the sleeved hole of the supporting disc comprises a taper hole and a cylindrical hole, the cylindrical hole is arranged at the small end of the taper hole, and the cylindrical hole is attached to the outer circular surface of the base pipe. Further, a corrugated conical surface with elastic tension is formed near the small end surface of the taper lock sleeve. Preferably, the outer diameter of the large end of the taper locking sleeve is larger than the inner diameter of the large end of the taper hole of the supporting disc. On