Oil Tubing and Casing

The outside diameter of the tubing is generally 60.3 mm to 114.3 mm. Tubing end processing forms are: non-upset with thread and coupling, external upset with thread and coupling;plain end, non-upset with thread and coupling, external upset with thread and coupling. The main function of tubing is to transport crude oil and natural gas from the hydrocarbon reservoir to the surface after drilling completed. It is used to withstand the pressure generated during the production process.

Premium Connection

The Premium insulated Tubing mainly consists of main pipe string, thermal-protective coating, sealing ring and liner pipe, etc. Using clip wall enclosed welding structure, The inner tube was prestressed during welding, Multiple insulation structures are added between the inner and outer tube interlayers, and between the insulating layer placed a hydrogen absorbing agent, At the same time, the special process was carried out and It can effectively reduce the energy loss in heat conduction, convection and radiation, It can not only prevent the occurrence of "hydrogen explosion" accident of insulated Tubing, but also extend the heat insulation life of Vacuum Insulated Tubing.

Vacuum Insulated Tubing

Pup Joint

Coupling

X-over

The coupling is a kind of drilling tool for oil field,Mainly used for tubing connection,The tubing end is connected with the inner wall of the coupling by conical thread,The end of the coupling is connected with the tubing by the same thread and the same pitch with flat type thread .It has the characteristic of relieving stress concentration at the root of external thread of tubing with single taper thread connection,Not easy to produce fatigue fracture and Good connection.Effectively prevent the break accident of oil well string .

Mainly Used to adjust the length of oil tubing and casing.

Crossover Mostly used to down hole,it is Downhole tools for connecting different connection/diameters .it Can also be used for conversion of Pin/Box of the tools .

Drill Pipe

The purpose of the drill pipe is to transport drilling mud to the bit, And raise, lower, or rotate the bottom hole device with the drill bit.The drill pipe must be able to withstand great internal and external pressure, distortion, bending and vibration.In the extraction and refining of oil and gas,The drill pipe can be used many times.The drill pipe is divided into kelly drill pipe, drill pipe and heavy drill pipe .

Downhole Motor Introduction

Downhole Motor Introduction is a kind of positive displacement downhole dynamic drilling tool which takes drilling fluid as power and converts liquid pressure energy into mechanical energy.When the mud pump pumped mud through the bypass valve into the motor, the motor in the inlet and outlet formed a certain pressure difference,Push the rotor around the axis of the stator to rotate,and the rotation speed and torque are transmitted to the drill bit through the universal shaft and the drive shaft,Thus achieving drilling operations .

Heat Insulated tubing and casing

High Collapse Tubing and Casing

High collapse casing is the casing whose collapse resistance is above 15% over the standard data of API 5C2.

 

• Design Principle

In accordance with the requirements of API BUL 5C3 for casing collapse and the requirement of inspection and device of oil field. we take the following measurements when the specification and grade is fixed.

  1、Decrease the residual stress of casing

  2、Improve the accuracy of wall thickness

  3、Improve the material’s yield strength

  4、Control pipe body conicity

 

Raw Materials

After reserch and trial production, the raw material for the production is limited to two brands 25 Mn2V and 30CrMo. The mechanical property of 25 Mn2V can fully meet the requirement of collapse resistance of the high collapse casing.

30CrMo has better material stability and as a kind of steel its hardenability is better owing to high content of elements like Cr, Mo and Mn. Meanwhile, carbon content is low and can undergo quenching and oil quenching.

Our company choose 25 Mn2V as the raw material for the production of high collapse casing.

 

 

Performance & Parameter

1、Mechanical property

 

 

 

2、Residual stress control

Residual stress control or yield strength 20%

Property

1)、Mechanical property

Size	MPa Yield Strength	MPa Tensile Strength	Elongation %	Impact J
114.3*6.35	955	980	19	65
114.3*7.37	930	973	18.5	94

 

 

2)、Measurement of residual stress

           Test of residual stress adopts Cutting Ring Method and the length of cutting ring is 3 times of the external diameter. Residual stress calculation formula is as below:

σɾ=ES(1/Do-I/Df)/(1-μ2)

σɾ - (residual stress of the pipe body surface), MPa;

E – (modulus of elasticity), E=2*10Pa;

S – (average thickness), mm;

Do – (Average value of external diameter before slotting), mm;

Df – (Average value of external diameter after slotting), mm;

μ– (Poisson’s ratio), μ=0.3

Sample No.	Yield Strength MPa	Residual MPa	Residual/Yield Strength %
114.3*6.35	955	14.3	15.0
114.3*7.37	930	13.8	14.8

SD-1T

The connection adopts flush joint without use of coupling but the joint strength is equal to the pipe body.

Thread is API 8RD round thread, which is easy to process.

The seal adopts 30°cant seal with good seal ability.

The pin and box adopt the inside flat design with inner diameter of pipe end equal to the inner diameter of pipe body.

The connection designed with -20° reverse torque shoulder. The joint has high capability to resist.

Surface Treatment: inner and outer thread will not be processed.

SD-2T

The connection adopts flush joint without use of coupling but the joint strength is equal to the pipe body.

Thread is API 8RD round thread, which is easy to process.

The seal adopts 30°cant seal with good seal ability.

The pin and box adopt the inside flat design with inner diameter of pipe end equal to the inner diameter of pipe body.

The connection designed with -20° reverse torque shoulder. The joint has high capability to resist.

Surface Treatment: inner and outer thread will not be processed.

SD-3T

SD-3T is the newly-developed connection.

Coupling connection type, the connection strength reaches to or over that of pipe body.

Thread is improved buttress thread with high connecting efficiency which is easy to process.

Main seal adopts taper to taper seal Structure with excellent seal ability.

The connection designed with -15°reverse torque shoulder, the joint has high capability to resist the compression, bend and over-torque loads.

The inner wall of pipe body aligns with the coupling inner wall.

Surface treatment, internal thread should be processed sand blasting.

SD-4T

The connection adopts flush joint, the “two step” connection.

The connection adopts the flush joint whose connection strength is high and is easy to process.

Main seal adopts taper to taper seal Structure with excellent seal ability.

The connection adopts the “two step” designed with -30°reverse torque shoulder and 90°torque shoulder, which increases Composite load capacity and seal ability.

Surface treatment, internal and outer thread should be processed sand blasting.

SD-5T

Integral connection, the connection strength reaches to or over that of pipe body.

Threads is improved buttress thread with high connecting efficiency.

Main seal adopts taper to taper seal structure with excellent seal ability.

The connection designed with both -30°reverse torque shoulder and 90°torque shoulder which enhance its seal ability and connection capacity of bearing combined load.

Surface treatment: Both external and internal threads should be phosphated or processed sand blasting.

1、Overview

According to relevant data, geological reserve of heavy oil around the globe is 10 times than crude oil. But API standard has not the heavy oil casing for thermal recovery oil, and there is no mill in the domestic and abroad to develop the casing for heavy oil explotation. So the oil field can only use the common API casing whose damage rate is higher. The demand for the process of the heavy oil explotation is higher. In this case, our company, Jiangsu Shined Petroleum Equipment Manufacturing Co,.LTD, has developed a series of heat insulated casing used for oil exploration of thermal recovery wells.

 

2、Features of the products

This series of high-level grade casing for heavy oil exploration has been developed by using material with specific elements on the bases of broad inspection and study of the mechanical characteristics of casing in the process of heavy oil exploration and failure types of the casing. The material is of good thermal stability and the strength property still remains stable at the temperature of 350o. It has better seal property and high thermal durability.

 

3、Specification

SD90H、SD100H、SD110H、SD125H

Specification of specific casing for heavy oil exploration in thermal recovery wells is listed as below

OD(in)	4 1/2	5	5 1/2	6 5/8	7	7 5/8	8 5/8	9 5/8	10 3/4	11 3/4	13 3/8
t(in)From t(in) TO	0.205 0.337	0.220 0.500	0.244 0.415	0.288 0.475	0.231 0.540	0.300 0.625	0.304 0.557	0.312 0.545	0.279 0.595	0.333 0.489	0.330 0.514

 

4、Design performance index

Grade	P	S	Cu
SD90H	≤ 0.02%	≤ 0.015%	≤ 0.20%
SD100H	≤ 0.02%	≤ 0.012%	≤ 0.20%
SD110H	≤ 0.02%	≤ 0.010%	≤ 0.20%
0.2	≤ 0.015%	≤ 0.010%	≤ 0.20%

 

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impac J
				10*10 0℃
SD90H	710 – 910	≥800	≥13	≥45
SD100H	750 – 950	≥850		≥50
SD110H	790 – 990	≥890		≥55
SD125H	890 - 1090	≥1000		≥60