In the development of shale oil and gas and deep oil and gas, acid fracturing is the core process for transforming reservoirs and improving production capacity. In the homework, hydrochloric acid, hydrofluoric acid, and sand carrying fracturing fluid with a concentration of up to 28% need to be injected into the formation under ultra-high pressure of 15000psi (about 103.5MPa) to dissolve rock minerals and open up oil and gas channels. The hose used to transport such media must withstand the triple limit test of strong acid corrosion, high concentration proppant erosion, and ultra-high pressure pulse at the same time. The UPE lined acid fracturing hose is a professional solution for this working condition. It uses the chemical inertness of ultra-high molecular weight polyethylene to resist 28% hydrochloric acid erosion, and is wrapped with multiple layers of high-strength steel wire to carry an ultimate pressure of 15000psi. It has become a reliable channel for "acid resistance, pressure resistance, and wear resistance" in deep and shale oil and gas fracturing operations. 1、 Acid resistant password for UPE lining: Why can it withstand 28% hydrochloric acid Hydrochloric acid (concentration 15% -28%) and hydrofluoric acid are the core components of acid fracturing fluid, used to dissolve carbonate rocks and silicate minerals. Ordinary rubber undergoes carbonization, swelling, or structural damage within a few hours in such strong acid environments. The ultra-high molecular weight polyethylene (UPE/UHMW-PE) liner achieves excellent chemical inertness due to its saturated molecular chain structure. The main chain of UPE molecules is composed of strong carbon carbon single bonds and does not contain unsaturated bonds or polar groups that are susceptible to chemical attacks. It has natural corrosion resistance to strong acids, bases, and most organic solvents. At room temperature of 20 ℃, the tolerance rating of UPE to hydrochloric acid is "OK". The actual test data of industry products has been clearly verified - the acid fracturing hose with UHMWPE inner lining imported from Germany/Japan can stably withstand long-term contact with 28% concentration hydrochloric acid and transport acid based fracturing fluid without pressure. For working conditions with sand containing acid solution, UPE also has ultimate wear resistance, which can withstand continuous wear for 8000 hours, far exceeding ordinary rubber solutions. The latest national standard GB/T 46167-2025 "Specification for Flexible Hoses and Hose Assemblies for Fracturing" has included hydrochloric acid with a maximum concentration of 30% in the applicable medium range of fracturing hoses, and the working medium temperature covers -35 ℃ to+100 ℃. The UPE lining scheme fully complies with the requirements of this new national standard, and the technical route has been recognized and standardized at the national standard level. 2、 15000psi bearing logic: mechanical architecture of multi-layer steel wire winding 15000psi (approximately 103.5MPa) is a typical working pressure for deep shale gas fracturing operations, and corresponding hoses need to maintain structural integrity at higher verification pressures. The API Spec 7K standard has clear requirements for hoses with pressure levels of D and above: the minimum burst pressure shall not be less than 2.5 times the working pressure. For 15000psi grade products, the verification pressure is 22500psi (1.5 times the working pressure), and the burst pressure is not less than 37500psi (2.5 times the working pressure). The reinforcement layer adopts a 4-6 layer high strength ultra flexible steel wire or steel wire rope alternating spiral winding structure, and adjacent layers are wound in alternating directions to form an "interlocking" mechanical skeleton. The inner steel wire provides radial support at a higher angle to resist tube swelling under ultra-high pressure; The outer steel wire constructs an axial tensile skeleton at a lower angle to prevent excessive elongation of the hose under pulse pressure. The interlayer is formed into a strong whole through a high adhesive layer, allowing stress to be evenly distributed in the multi-layer structure. The product parameters show that when the inner diameter of the 15000psi grade hose is 2 inches, the minimum bending radius is about 1000mm, which meets the flexibility requirements of ultra-high pressure bearing and on-site pipe laying. API 7K FSL0 certification and ABS classification society certification are standard configurations for this type of product. Some high-end models have increased their working pressure to 20000psi (approximately 138MPa) and burst pressure to 40000psi (approximately 276MPa). 3、 Fracturing scenario adaptation: from standard implementation to on-site verification The practical value of UPE lined multi-layer wrapped acid fracturing hoses has been validated in multiple fracturing operations both domestically and internationally. Its application meets the requirements of the new national standard GB/T 46167-2025, and the applicable media include acid fracturing fluid, proppants, 30% hydrochloric acid, liquid carbon dioxide, and nitrogen. The inner diameter covers 38-180mm, and the maximum working pressure covers two levels: 103.5MPa and 138.0MPa. In the Houston fracking project in the United States, the average service life of this series of hoses per well exceeded 1200 hours, reducing the number of replacements by 40% compared to similar products. In China, the product has successfully served deep oil and gas development projects such as Tarim Oilfield and Tuha Oilfield. The joint adopts an integral union or integral flange configuration to meet the different needs of frequent disassembly and assembly or permanent high-pressure connection of the fracturing manifold. Combined with equal diameter design to reduce fluid resistance and turbulent noise, the pulse life can reach over 100000 times. In summary, the acid fracturing hose with UPE lining resistant to 28% hydrochloric acid and multi-layer wrapped steel wire pressure bearing 15000psi perfectly meets the systematic requirements of "strong acid resistance, high pressure resistance, and long service life" for deep and shale oil and gas acid fracturing, thanks to its chemical inert barrier of ultra-high molecular weight polyethylene lining, ultra-high pressure bearing of 4-6 layers of steel wire alternately wrapped, and dual standard certification of API 7K and GB/T 46167. From stable delivery of 28% hydrochloric acid to 4-fold blasting redundancy at a pressure level of 15000psi, from 8000 hours of wear resistance limit to 1200 hours of single well service verification, every material selection and structural detail points towards the same goal: to provide safe, reliable, and durable flexible support for efficient delivery of acid fracturing fluid and proppants in reservoir transformation thousands of meters underground.