Lisa Tan

July 15, 2022

Quality requirements for seamless steel pipes

(1) Quality requirements ①Chemical composition of steel: The chemical composition of steel is one of the most important factors affecting the performance of seamless steel pipes, and it is also the main basis for formulating process parameters for rolling and heat treatment of steel pipes. Alloying elements: intentionally added, according to application Residual elements: brought into steelmaking, properly controlled Hazardous elements: strictly controlled (As, Sn, Sb, Bi, Pb), gases (N, H, O) Out-of-furnace refining or electroslag remelting: improve the uniformity of the chemical composition in the steel and the purity of the steel, reduce the non-metallic inclusions in the billet […]
July 5, 2022

Classification, production process and mechanical properties of seamless steel pipes

According to different production methods, it is divided into hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe, pipe jacking, etc., all of which have their own process regulations. The materials are ordinary and high-quality carbon structural steel (Q215-A~Q275-A and 10~50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel, etc. According to the use, it is divided into two categories: general use (for water, gas pipelines and structural parts, mechanical parts) and special (for boilers, geological exploration, bearings, acid resistance, etc.). Seamless steel pipes are widely used. General-purpose seamless steel pipes are rolled from ordinary carbon structural […]
June 23, 2022

Basic knowledge and uses of seamless steel pipes, oil casings and pipes

Knowledge of oil casing Basic knowledge Oil casing is a large-diameter pipe that acts to fix the wall or bore of oil and gas oil wells. The casing is inserted into the wellbore and fixed with cement to prevent the wellbore from separating the rock formation and the wellbore from collapse, and to ensure the circulating flow of drilling mud to facilitate drilling and exploitation. Different types of casings are used in oil production: Surface oil casing – protects the well from contamination by shallow water and shallow gas layers, – supports wellhead equipment and maintains the weight of other […]
June 17, 2022

Classification and function of casing

Casing Classification and function of casing Casing is the steel pipe that supports the wall of oil and gas wells. Several layers of casing are used for each well according to different drilling depths and geological conditions. Cement cementing should be used after the casing is run down the well. It is different from tubing and drill pipe and cannot be reused. It is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Casing can be divided into: conduit, surface casing, technical casing and oil casing according to the usage, […]
May 31, 2022

Steel pipe cement-soil pile construction method (synthetic steel pipe pile construction method)

This kind of construction method refers to the construction method of burying the steel pipe piles with side protrusions (ribs) in the cement-soil column, and integrating the two to form a composite pile. The so-called cement-soil column is a mixture of cement slurry and soil with a poor mix ratio injected from the cobalt head while drilling with a special drill bit on the pile position. The diameter of the synthetic steel pipe pile (that is, the diameter of the cement-soil column) is 600~1500mm, which is 200~400mm larger than the outer diameter of the steel pipe, and the applicable pile […]
May 27, 2022

Construction method of middle excavation type steel pipe pile

The middle excavation type steel pipe pile construction method refers to inserting a special drilling rig into the open type steel pipe pile, and pressing the steel pipe pile into the soil with a pressurized jack or a hoist while drilling and taking out soil. 1. Method of pile end treatment (cement slurry spraying and stirring to form an enlarged head, or final strike, or pouring concrete, etc.) to obtain a higher bearing capacity. (1) Characteristics of TN. method Insert a long auger drill pipe into the steel pipe pile to make it drill into the soil; then use the […]
May 19, 2022

Examples of steel pipe pile construction methods

4.1 Drum-type diesel hammer impact pile driving method (1) The method of “heavy hammer and low strike” should be adopted for piling. (2) The pile frame generally adopts a 3-point support crawler pile driver. (3) The elevation of the pile top of the steel pipe pile in the piling sequence is often buried below the natural ground according to the design. During construction, it can be adopted: @ excavate the soil to the design elevation of the pile top before piling; ② The pile top is driven to the natural ground, and then the pipe is cut To the design […]
May 9, 2022

Steel Pipe Piles Overview and Construction Method

1 Overview For more than half a century, steel pipe piles have gradually become one of the main types of piles in foundation engineering. Steel pipe piles are widely used in Shanghai, my country, and some deep-water wharves, Baoshan iron and steel plants, power plants and dozens of high-rise buildings are all based on steel pipe piles. 2 Advantages and disadvantages of steel pipe piles (1) Advantages: Good driving resistance, that is, it can withstand a strong impact force when it is driven into the soil, has a strong ability to penetrate the hard soil layer, and can effectively drive […]
April 25, 2022

Double-layer lined screening pipe&Sand-control screening pipe for oil well

Double-layer lined screening pipe      The double-layer lined screening pipe is composed of a base pipe of API standard, a double-layer high precision wedge wire filter pipe and lined filter material in between.   Characteristics of the product:   1.High-precision screening gap can effectively control sand and act as a protective medium.     2.The use of double-layer lined screening pipe can reduce diameter of drilling hole, save drilling time, and reduce drilling cost.     3. The use of double-layer lined screening pipe can reduce the workload of operators, and improve the success rate of drilling.     4.Filter material can be […]
April 18, 2022

Hole-drilled pipe&Water filter pipe for geothermal well&Water filter pipe of air-conditioning well

Hole-drilled pipe We supply hole-drilled pipes of various specifications and materials and provide hole-drilling services, and you are welcome to call and inquire us! Diameter of hole-drilled pipe:114mm,127mm,140mm,168mm,178mm,219mm,245mm,273mm,325mm,406mm,426mm,530mm,630mm。 Materials of hole-drilled pipe: Stainless steel, carbon steel, J55,N80,and L80. 2. Water filter pipe for geothermal well                  A geothermal well filter pipe is composed of a base pipe of API standard and a wire-wound filter pipe of high precision.   Characteristics of the product:   1.It has strong pressure bearing capacity. With the support of the inner-layer base pipe, even if external filter pipe is […]
April 12, 2022

Wire-wound water filter pipe

Wire-wound water filter pipe A wire-wound water filter pipe is made by welding wedge winding wire and wedge bar (or round bar) at each crossing point. Characteristics of the product: 1.Wire-wound water filter pipe features firm structure, high porosity and accurate size of gap. It is specially fit for fine sand and silt strata of wells.   2.The opening area of the wire-wound water filter pipe is large, and its filtration area is high up to 60%.     3.Wedge-shaped design prevents screening pipe from being blocked and makes it easier for backwash.   4. The larger filtration area makes it easier for […]
April 6, 2022

Basic knowledge of steel pipe varieties and standards

1. Basic knowledge of steel pipe standards 1. Standards: Standards are repetitive things with diversity-related characteristics in economic and technological activities. On the basis of summarizing the comprehensive results of scientific technology and practical experience, they are fully negotiated by relevant parties, and are issued in specific procedures and specific forms. Uniform and guiding regulations that must be complied with within a certain range. 2. Classification of steel pipe product standards: a) According to the promulgating agency, it is divided into: national standard (GB or GB/T), industry standard (such as YB or YB/T), enterprise standard (Henggang enterprise standard code is […]
March 29, 2022

Steel pipe standards and basic knowledge

1. Basic knowledge of steel pipe standards 1. Standards: Standards are repetitive things with diversity-related characteristics in economic and technological activities. On the basis of summarizing the comprehensive results of scientific technology and practical experience, they are fully negotiated by relevant parties, and are issued in specific procedures and specific forms. Uniform and guiding regulations that must be complied with within a certain range. 2. Classification of steel pipe product standards: a) According to the promulgating agency, it is divided into: national standard (GB or GB/T), industry standard (such as YB or YB/T), enterprise standard (Henggang enterprise standard code is […]
March 8, 2022

Coupling standards and requirements for oil casing

9.1 General requirements Couplings shall be seamless pipes of the same grade, type and heat treatment as pipes, except in the following cases in 9.2. This standard does not require that coupling blanks be cut from coupling stock ordered in accordance with this standard. When couplings are electroplated, the electroplating process is controlled to minimize hydrogen absorption. 9.2 Grade substitution or heat treatment 9.2.1 If no heat treatment is specified in the order, Grade H40 pipe may be supplied with Couplings of Grade H40, J55, or K55 rolled, normalized, normalized + tempered, or quenched + tempered. 9.2.3 If no heat […]
February 28, 2022

Various test procedure rules for tubing and casing

10.4 Tensile test 10.4.1 Stress release temperature For the purpose of tensile test frequency requirements, stress-relief tempered tubes are considered to have not been “heat-treated” when the stress-relief temperature is 56°C (1000°F) below the final temper temperature. 10.4.2 Furnace—Controlled Tensile Test—Group 1, 2, 3 For each heat of steel produced in accordance with this standard, the manufacturer shall conduct a tensile test as a control test for each heat of steel. For electric welded pipes, this controlled tensile test may be selected by the manufacturer, or be carried out on the steel billet or on finished tubes. A furnace-controlled tensile […]