High pressure natural gas well slotting jacket sand prevention pipe

Abstract

The invention relates to a high pressure natural gas well slotting jacket sand prevention pipe. The high pressure natural gas well slotting jacket sand prevention pipe is formed by a base pipe, a slotting jacket and a circular hole helical welding mesh pipe and is characterized in that the base pipe is provided with a circular overflowing through hole and is served as an interior support for the slotting jacket; the circular hole helical welding mesh pipe is served as a protective sleeve for the slotting jacket. According to the high pressure natural gas well slotting jacket sand prevention pipe, synthesis technologies such as the powder metallurgy, the electric spark numerical control machining and material control deformation are adopted to manufacture a high density, high accuracy, high wear resistant washing and high corrosion resistant well completion sand prevented micro-gap overflowing channel for a natural gas well, the overflowing channel is guaranteed not being blocked during the long time production process and having functions of automatically loosening well cylinder blocked sand and enabling the natural gas to flow from the well cylinder to the full length range of the base pipe in a balanced mode, and a set system and complete solution for well completion and sand prevention of a high pressure, high yield and high corrosion natural gas well is provided.

Description

technical field [0001] The invention is a slotted jacket sand control pipe for a high-pressure natural gas well, which is used for well completion and sand control of a high-pressure, high-yield, high-corrosion natural gas well. It can also be used for sand control of ordinary oil wells and gas wells. Background technique [0002] At present, the sand control pipes of natural gas wells are generally in the form of slotted liners and wire-wrapped screens. There are many problems in the process of running into the well and production and use, which may cause sand control failure or sand particles to block the gaps, resulting in reduced production or even no productivity of the gas well. The specific performance is: [0003] 1. Problems with slotted liners: [0004] (1) Due to the limitation of the processing cutter, the slot width of the machined slotted liner is at least 0.5mm, so it can only be applied to medium and coarse sand grain oil and gas reservoirs; [0005] (2) F...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the limitation of the processing cutter, the slot width of the machined slotted liner is at least 0.5mm, so it can only be applied to medium and coarse sand grain oil and gas reservoirs;

[0005] (2) For the slotted liner processed by laser, the gap width can reach 0.2mm. At the arc starting point of each slot, there must be a through hole with a diameter obviously larger than the slot width. These holes seriously reduce the overall slot width. Filtration of the liner;

Generally, the length of parallel axial slots should be less than 100mm, and the slot spacing should be 0.3-0.7 times the slot length. Therefore, the flow area of ​​the slotted liner is severely restricted, which limits the production of oil and gas wells;

[0007] (4) All the slots divide the base pipe material into discontinuous strips, that is, after the base pipe is slotted, the mechanical properties of the slotted liner such as bending, torsion, and pressure are greatly weakened. In deep wells (8000m) and high pressure (100MPa) easily deformed and damaged during underground installation and use;

[0012] (1) The existing wire-wound screen manufacturing technology cannot precisely manufacture the gap width below 0.12mm, and cannot effectively prevent sand with a diameter below 0.1mm;

[0013] (2) The seam wall made of stainless steel wire or alloy material is not resistant to high pressure (100MPa), high yield (100×10 4 m 3 / day) The high-speed erosion and erosion of fine silt particles carried by the natural gas flow in the gas well will gradually increase the gap width during the production process, and the life of the sand control pipe is very low;

[0014] (3) When the rounded corners of the stainless steel wire or alloy steel wire at the outer gap of the wire-wound screen are large, it is easy to cause sand plugging

However, it is difficult to achieve greater edge sharpness when rolling steel wire;

[0015] (4) The wire-wound screen pipe is to spirally wind continuous steel wires and connect them with the axial steel wires evenly distributed on the circumference of the casing by contact resistance welding. It has a large number of welding points, and the welding reliability cannot be guaranteed. point by point test

When the wire-wound screen is run into the well, it will bend, twist, collide with the casing or well wall, scrape, etc., often causing local deformation of the wire screen and cracking of the solder joints, resulting in sand control failure

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