Corrosion resistant UHMWPE liner tubing

Product Introduction:

Plastic-steel pipe, commonly referred to as lined tubing, is a composite pipecomposed of seamless steel pipe and polymer plastic. For lined raw material, The base lining materials are mainly HDPE (High Density Polyethylene) and UHMWPE (Ultra High Molecular Weight Polyethylene). Right now, clients prefer UHMWPE for its good quality and performance.

Product Advantage:

1-Introduction for UHMWPE(Raw Material of UHMWPE):

Thermoplastic lined tubing definition: tubing with thermoplastic as the main raw material is lined into the inner wall of the base tube (usually metal tubing) by the reducing process, so as to play the role of anti-corrosion, anti-scale and anti-wear.Thermoplastics include polyethylene (PE), heat-resistant polyethylene (PERT), ultra-high molecular weight polyethylene (UHMWPE), polypropylene (PP), polyamide (PA), polyketone (POK), polyphenylene sulfide (PPS), polyether ether ketone (PEEK) and polyvinylidene fluoride (PVDF). When using thermoplastic pipes of different materials as lining, they should meet the corresponding standard requirements of their lining pipe materials. UHMWPE：Molecular Weight > 2 Million

2-Manufacturing process for UHMWPE lined composite pipe:

ExtrusionReduce the diameter and Lining-Stress release-Sizing flanging

3-Technical principle :

The steel pipe serves as the outer supporting and protective layer, capable of withstanding a certain pressure. Lined with UHMWPE, the composite pipe inner wall features outstanding impact resistance, low temperature

resistance, abrasion resistance, chemical corrosion resistance and self-lubricating performance.

4-Performance characteristics:

4.1Wear resistance:

UHMWPE has excellent wear resistance, which is more than 8 times that of medium carbon steel and more than 5 times that of nylon 66. Mortar wear testing machine is used to carry out mortar erosion wear test on the

lining material.

4.2 Chemical resistance:

UHMWPE has excellent chemical resistance. Except for strong oxidizing acids, it resists a variety of corrosive media within a certain concentration range.

4.3 Impact resistance:

The impact strength of UHMWPE is the highest among plastics at present, and it is 3 to 5 times higher than polycarbonate, which is known for impact resistance.

4.4 High tensile strength:

The tensile strength of UHMWPE is more than 22 MPa, and the tensile elastic modulus is 100-125 GPa, which effectively solves the problem that the inner lining is easy to fall off.

4.5 Good environmental adaptability: UHMWPE can be used for a long time at an ambient temperature of -50℃ ~ +90℃.

Technical Parameters:

Product Uses:

The well was repaired on July 22, 2019, and completed on July 25, 2019, with 152 tubing joints and one Φ44 mm sand control pump installed at a pump depth of 1560.19 m. One Φ44 mm piston and 171 sucker rods were run downhole. Before lining replacement, the well suffered severe eccentric wear. In 2018, three workovers were performed on this well caused by eccentric wear issues such as tubing rupture and rod parting, with an average pump inspection cycle of less than 100 days.To address the eccentric wear between sucker rods and tubing in this well, full-well lined tubing was deployed. On January 21, 2021, fluid output of thewell declined, and pipe leakage was identified via logging surveys. During the repair of the downhole pipe string, severe wear was detected on the coupling thread between the 118th and 119th tubing joints, rendering the joint unusable. Inspection of the lining pipe revealed no eccentric wear on its inner wall. The well was successfully put back into service after the worn coupling was replaced. Compared with operation before lined tubing application, the pump inspection cycle was extended by 446 days, a 4.46-fold increase. Conclusion after using UHMWPE: -01 SuitabilityAfter the UHMWPE liner is installed inside Φ73 mm tubing, the inner diameter becomes Φ55 mm. The pump diameter of pumping wells is Φ44