scholarly journals Research on the Four-stage Drill Pipe Automatic Conveying System

2021 ◽  
Vol 2095 (1) ◽  
pp. 012043
Author(s):  
Hang Chen ◽  
Dezhong Xin
Keyword(s):  
Theoretical Calculation ◽  
Drill Pipe ◽  
Starting Point ◽  
Drill Pipes ◽  
Conveying System

Abstract The four-stage drill pipe automatic conveying system is developed to solve the problem that the capacity of the existed drill pipe conveying system is very limited, which needs workers to add drill pipes frequently during drilling and can’t fit the development of the automatic rig. The four-stage drill pipe conveying path plan of the multidirectional automatic rig is designed based on the general conveying path and the starting point normalization, and operating mechanisms are designed, including the pipe box, the transferring device, the main and the deputy mechanical arm. This plan is helpful to reduce the height of the rig by using the room below the side of the pipe box. According to the mechanism, the conveying path is adjusted adaptively to avoid interference between the conveying system and the rig. It is verified by the theoretical calculation and the model machine test that pipes can be delivered automatically and accurately by the four-stage automatic conveying system.

High-Speed Wired Drill Pipe and its Corresponding Manufacture & Test Technology Research

2021 ◽  
Author(s):  
Haochen Han ◽  
Yong Zhang ◽  
Jia Chen ◽  
Qi Sun ◽  
Zhimeng Fang ◽  
...  
Keyword(s):  
Mass Production ◽  
Manufacturing Process ◽  
High Speed ◽  
Transmission Rate ◽  
Drill Pipe ◽  
Pass Rate ◽  
Series System ◽  
Validation Test ◽  
Test Technology ◽  
Drill Pipes

Abstract High-speed wired drill pipe and its corresponding communication technology not only can achieve high-speed transmission rate and high-capacity, but also can realize real-time monitoring and dual-way communication in whole section, which can prevent downhole problems effectively. As a series system, the homogeneity and robustness of these wired drill pipes are crucial. This paper focuses on how to overcome the difficulty in manufacturing process of information drill pipe and complete the validation test. In order to guarantee the quality of information drill pipe and satisfy the technological requirements of mass production, we optimize the manufacturing process and put forward reasonable test techniques. The optimizations of manufacturing process include the analysis on constant tension of pressure pipe, quantitative cutting pipe and perforation in pipe nozzle. The testing techniques includes magnetic coupling coil impedance test, high pressure test, communication performance test of both single pipe and series system. The test result can be judged and evaluated by the attenuation value of the signal attenuation test and the signal reflection waveform as well as sealing reliability. With the help of the optimization of the manufacturing process and the application of new tooling, the quality and robustness of information drill pipe is improved obviously. Pass rate in primary assembly is increased from 70% to 92%. After the second assembly, pass rate can be increased to 99.5%. Besides, the work efficiency is greatly improved and the process requirements of mass production are satisfied. The validation test can screen out the drill pipe with poor quality and performance effectively thus to improve the reliability of the whole system. By means of the improvement of manufacturing and the validation test, the comprehensive pass rate of information drill pipes is increased from 84% to 95%. During three field tests in Jilin and Daqing Oilfield, the information drill pipes functioned well and accomplished all the test tasks successfully. High-speed wired drill pipe can improve the downhole data transmission on a large margin. The theorical transmission rate can be up to 100 kbps, 10,000 times as much as the traditional mud impulse telemetry. The manufacturing optimization and test technology can guarantee the performance and realize downhole data highway.

scholarly journals Simulation and Experimental Study on Cuttings-Carrying for Reverse Circulation Horizontal Directional Drilling with Dual Drill Pipes

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Lingrong Kong ◽  
Yu Wang ◽  
Bohong Wu ◽  
Zhiqiao Wang
Keyword(s):  
Numerical Simulations ◽  
Drill Pipe ◽  
Directional Drilling ◽  
Horizontal Directional Drilling ◽  
Two Phase ◽  
Pipe System ◽  
Reverse Circulation ◽  
Drill Pipes ◽  
The Law ◽  
Construction Accidents

In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction accidents such as drill-burying and drill-sticking occur occasionally when pipelines installed by HDD method in an unstable stratum such as sand cobble stratum. Recently, HDD with dual drill pipes was used to install pipelines in unstable stratum, and the effect is significant. The law of cuttings migration for HDD with dual drill pipes is still unclear. Therefore, it is necessary to study the law of cuttings migration in reverse circulation with dual drill pipes. This study performs numerical simulations and experimental research on the cuttings-carrying process in reverse circulation directional drilling with dual drill pipes. Based on the assumption of dual concentric pipes, simulations of fluid-solid two-phase flows are conducted in different flow channels between the inner and outer drill pipes. An experimental cuttings-carrying model is then established. By combining the results of the numerical simulations and experimental investigation, the hydraulic parameters of the dual drill pipe system are optimized, and the rationalities of the drill tool design and the grading selection are validated. The results of this study provide a reference cuttings-carrying model during reverse circulation HDD with dual drill pipes.

Corrosion analysis of G105 coating drill-pipe washout

2014 ◽  
Vol 61 (6) ◽  
pp. 365-369 ◽  
Author(s):  
Zhouyang Lian ◽  
Dongsheng Chen ◽  
Wuji Wei ◽  
Yongzhang Zhou ◽  
Juncheng Jiang
Keyword(s):  
Design Methodology ◽  
Drill Pipe ◽  
Corrosion Process ◽  
Pipe Surface ◽  
Content Type ◽  
Pit Nucleation ◽  
Drill Pipes ◽  
Microstructure Of The Material ◽  
Pipe Materials ◽  
Selection Of

Purpose – The purpose of this study was to investigate the reason of G105 coated drill-pipes suffering from washout after drilling for 70000–80000 m. Design/methodology/approach – The microstructure, micromorphology and corrosion products near the washout were analyzed by metallurgical microscopy, SEM and EDS. Findings – Results showed the metallographic microstructure of the material was typical tempered sorbite. No fatigue crack was observed. Drill-pipe washout was caused mainly by the inclusion of MnS in steel because of the excess S and by damaged coating, both of which induced pit nucleation and promoted the pitting corrosion process. The corrosion hole extended from the interior to the exterior, which resulted in the fracturing of the external drill-pipe surface under pressure. Originality/value – This paper can give practical help to the selection of drill pipe materials in the future.

scholarly journals THREAD RESTORATION TECHNOLOGY OF TOOL-JOINT IN DRILL PIPES BY METHOD OF ELECTRIC CONTACT WELD DEPOSITION INTO UPSET GROOVE

2018 ◽  
Vol 2018 (7) ◽  
pp. 19-25
Author(s):  
Андрей Паренко ◽  
Andrey Parenko ◽  
Константин Макаренко ◽  
Konstantin Makarenko
Keyword(s):  
Drill Pipe ◽  
Thermal Impact ◽  
Electric Contact ◽  
Major Repair ◽  
Impact Area ◽  
Drill Pipes ◽  
Tool Joint

In connection with a relatively high cost of drill pipes large companies loss caused by rejection achieves tens millions of rubles. And at the same time it is necessary to take into account that the tool-joint thread rejection does not mean at all unworthiness to operation a drill pipe itself as having restored an inter-lock it is possible to continue the operation of a res-tored product. In such a way, one of the priority direc-tions at major repair of drill pipes is a restoration of interlock geometrical joints. In this paper there is considered a technology for repair of a worn thread in an interlock of drill pipes and its updating at the expense of electric contact weld deposition used into an upset groove. The method of-fered allows keeping a pipe without its shortening at repair at the expense of additional metal application directly upon a thread area and decreasing a thermal impact area and also increasing operation properties of a restored pipe.

Numerical Analysis of VIV on Drillstring During CPT in Shallow High-Current Sea

2019 ◽  
Author(s):  
Marcio Yamamoto ◽  
Sotaro Masanobu ◽  
Joji Yamamoto ◽  
Katsuo Ban ◽  
Masayuki Ikenobu ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Drill Pipe ◽  
Petroleum Industry ◽  
High Current ◽  
Cone Penetration ◽  
Undisturbed Soil ◽  
Bottom Hole Assembly ◽  
Fixed Type ◽  
Different Depths ◽  
Drill Pipes

Abstract To design the foundation of a fixed-type wind turbine, the geotechnical data of the region in different depths below the seafloor must be surveyed using a cone penetration test (CPT). A common methodology to carry out the CPT in shallow water is to use a drillstring to drill a well. Then the drillstring must be anchored and a cone probe is conveyed within the drillstring to survey the undisturbed soil a few meters below the bit. However, during the period the drillstring is anchored in a relative high-current environment, it will be exposed to the vortex-induced vibration (VIV). In this article, we will present the VIV numerical analysis to assess the stress and accumulate fatigue on the drillstring. The simulation was calculated in the frequency domain using commercial software for marine riser analysis used by the Petroleum Industry. We compared two different drillstrings, one composed by Bottom Hole Assembly (BHA) and drill pipe and the other using BHA and heavyweight drill pipe. The VIV results show slightly better performance of the string composed by heavy weight drill pipes.

Research Status and Development of Titanium Alloy Drill Pipes

2019 ◽  
Vol 944 ◽  
pp. 903-909 ◽  
Author(s):  
Rui Zhe Li ◽  
Chun Feng ◽  
Long Jiang ◽  
Ya Qiong Cao
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
High Temperature ◽  
Drill Pipe ◽  
Petroleum Industry ◽  
Specific Strength ◽  
Deep Wells ◽  
Production Safety ◽  
Drill Pipes ◽  
Pipe Processing

Petroleum and natural gas exploration and development are deepening, and the environment and stratum conditions encountered are becoming more and more complex. There are many high-temperature, high-pressure, high-corrosion wells, and the number of ultra-short horizontal directional wells, ultra-deep wells, and extended reach wells are also increasing. The steel drill pipe has not been able to meet and adapt to these requirements. Titanium alloy drill pipe has a series of advantages such as low density, high specific strength, excellent corrosion resistance, high temperature resistance, fatigue resistance, non-magnetic and good flexibility. It is suitable for the development of modern petroleum industry. This article discusses the use of titanium alloy drill pipe in domestic and foreign drilling in horizontal wells with short radius, the design of alloy components in titanium alloy drill pipes, body pipe processing, joint connection and corrosion resistance. Combining the practical application of titanium alloy drill pipe points out the current problems. Finally, from the aspect of drilling cycle, production safety and cost saving, the development and application of titanium alloy drill pipes in deep wells, ultra-deep wells and deep-sea drilling operations are prospected.

Oil Country Tubular Goods Fatigue Testing: Do We Test Them Enough?

2017 ◽  
Author(s):  
Catalin Teodoriu
Keyword(s):  
Fatigue Resistance ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Drill Pipe ◽  
High Stress ◽  
Economic Losses ◽  
Cycle Fatigue ◽  
Drill Pipes ◽  
Number Of Cycles

Fatigue is the most common known problem of drill pipes, since the combination of make-ups performed to connect the pipes and all the external loads, together with the threaded geometry of the connections, will stimulate the appearance of high stress points, cracks and finally promoting considerable economic losses. When threaded connections are used to connect the casing string, the fatigue resistance of the connection will affect the whole integrity of the string, and thus, in most cases, it is lower as the casing body. Generally, fatigue is classified as low-cycle fatigue and multi- or high-cycle fatigue. For Oil Country Tubular Goods (OCTG), a typical high cycle fatigue is represented by drill pipe fatigue in deviated wells. Unlike drill pipe, the casing may be exposed both to low-cycle as well as to high-cycle fatigue. Low-cycle fatigue is a common type of failure when the applied loads induce high stresses in the metallic material. The number of cycles may vary from as low as 10 up to 100. High-cycle fatigue requires a large number of cycles to failure. In order to avoid catastrophic failures, high-cycle fatigue resistance is usually considered to be sufficient if the number of cycles is above 106. The oil business has focused excessively on testing drilling risers and drill pipes under fatigue loads, but when it comes to casing and tubing the experimental approach may require different solutions. Drilling with casing opened the intensive testing of casing connections against fatigue resistance. Moreover, recent papers have shown intensive work on redesigning connections to withstand fatigue. New applications like rotating while running require a rethinking of testing strategy of Casing and Tubing. The following paper focuses on answering the question whether we test enough. The first part compares existing testing facilities, followed by an intensive discussion about the true loads of a casing or tubing connection. Using public testing data, the second part of the paper tries to identify how far the results provided by various types of testing machines can be compared with each other. For example, we found that low cycle fatigue results may not fully reflect the predictions based on extrapolations of high cycle fatigue results.

Friction Considerations in Rotary Shouldered Threaded Connections

2007 ◽  
Author(s):  
Catalin Teodoriu ◽  
Herschel McDonald ◽  
Charles Bollfrass
Keyword(s):  
Drill Pipe ◽  
Extreme Environments ◽  
Drill String ◽  
Directional Drilling ◽  
Frictional Properties ◽  
Threaded Connections ◽  
Safety Margins ◽  
Drill Pipes ◽  
Drilling Conditions ◽  
First Time

The new connection designs introduced by the drill pipe manufacturers (double shoulder connections, intelligent drill pipes or any new design for increased torque resistance) make the use of the Farr formula for calculating proper assembly torque more problematic. Additionally, severe drilling conditions like HPHT, directional drilling and extreme environments are affecting critical thread compound performance properties, which can make it impossible to attain the optimum makeup torque for the connection. The new drilling conditions are exposing the drill string components to higher loads and consequently reduce the safety margins. Since the makeup process is the only way to control and achieve the maximum tool joint loading capacity, it becomes important to understand the effect of friction on optimum makeup torque calculation. This paper presents a modified equation for optimum makeup torque calculation by using the latest research on thread compound frictional properties. Also, the thread compound lubrication mechanism will be explained. For the first time the thread turn load will be related to the optimum makeup torque. The paper will also explain why there is a need for a new API standard for determining thread compound frictional properties. The formula developed herein, based on experimental results, demonstrates that the newly introduced overall factor may differentiate between used and new connections.

scholarly journals Finite Element Modeling of Slip Insert Geometric Grip Optimization for Oil Well Drill Pipes

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Liping Tang ◽  
Baolin Guo ◽  
Xiaohua Zhu
Keyword(s):  
Mechanical Model ◽  
Oil And Gas ◽  
Drill Pipe ◽  
Rake Angle ◽  
Oil Well ◽  
Parameter Sensitivity Analysis ◽  
Gas Reservoirs ◽  
Drill Pipes ◽  
Parameter Values ◽  
Walled Cylinder

Drilling is being used to access ever-deeper oil and gas reservoirs, thereby presenting various challenges to the design and operation of down-hole tools. Slip inserts are suspension devices that are used to lower the drill pipe into the borehole and lift it to the wellhead, and their performance determines the extended depth of the borehole. In this paper, based on the field and laboratory test of the slip system, parameter sensitivity analysis is applied to the performance of a slip insert to guide the design of the latter. First, a mechanical model is developed of the drill pipe with the slip insert acting on it, and the stress acting on the drill pipe is analyzed theoretically by regarding the drill pipe as a thick-walled cylinder. Next, a numerical model is established to investigate how the slip-insert structure influences the drill-pipe stress, wherein the drill-pipe diameter is 5″ and the axial load is 180 tons. Finally, the results of a series of numerical simulations are presented. For the present slip insert and drill pipe, the optimum slip-insert parameter values are a front-rake angle of 70°, a back-rake angle of 30°, a tooth height of 2 mm, and zero chamfer.

Research on the Method for Drill Pipe Thread Inspection

2006 ◽  
Vol 321-323 ◽  
pp. 472-475
Author(s):  
Jin Feng Ding ◽  
Yi Hua Kang ◽  
Xin Jun Wu
Keyword(s):  
Working Conditions ◽  
Laboratory Testing ◽  
Smooth Surface ◽  
Drill Pipe ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Inspection Method ◽  
Drill Pipes ◽  
Thread Root ◽  
Non Destructive

Failure of the drill pipe thread is always a very serious problem which may result in serious accidents and rework during the drilling of oil wells. Rupture crack of the drill pipe thread may result in great economic and labour losses, so they need to be inspected periodically. As the drill pipe thread is not a smooth surface and is in the end area of drill pipes, it is very difficult to be inspected by traditional Non-destructive testing (NDT) methods. According to the experiment results and the requirement of the working conditions in the field, a local MFL inspection method, which is the most adaptive inspection method, is determined. Laboratory testing and field experience show that this inspection method can detect the crack as small as 0.6mm (depth) in the thread root and thus reduces the risks of drilling failure. This local MFL inspection method can inspect flaws of the drill pipe thread that occur in practice exactly and quickly, and it has very wide application perspectives.

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