Method of Study on Drilling Parameter of Strata Obtained by Photoelectric Encoder

2012 ◽  
Vol 170-173 ◽  
pp. 914-917
Author(s):  
Hao Tian ◽  
Shu Cai Li ◽  
Yi Guo Xue ◽  
Hai Yan Li ◽  
Kai Ning
Keyword(s):  
Underground Space ◽  
Drilling Process ◽  
Geological Environment ◽  
Drilling Depth ◽  
Response Characteristics ◽  
Drilling Parameters ◽  
Photoelectric Encoder ◽  
Drilling Parameter ◽  
Different Response ◽  
Change Curve

According to complex geological environment of underground space，drilling parameters were obtained based on the research of drilling process. As a sensor for collecting the date of drilling parameter, photoelectric encoder was chosen to combine field test. The change curve of drilling depth with torque in different strata was collected successfully by using photoelectric encoder and can reflect the change of torque during drilling. It is found that there are different response characteristics in different strata, but these response characteristics show the certain orderliness.

scholarly journals An experimental investigation into the borehole drilling and strata characteristics

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0253663
Author(s):  
Cancan Liu ◽  
Xigui Zheng ◽  
Niaz Muhammad Shahani ◽  
Peng Li ◽  
Cong Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Prediction Models ◽  
Rotation Speed ◽  
Drilling Process ◽  
Mechanical Parameters ◽  
Response Characteristics ◽  
Drilling Parameters ◽  
Concrete Blocks ◽  
Borehole Drilling ◽  
Rock Mechanical Parameters

Measurement while drilling is an important part of the intelligent development of coal mines. The main purpose of this paper is to comprehensively analyze the response characteristics of borehole drilling parameters and find a better method to predict rock mechanical properties based on drilling parameters. Firstly, six concrete blocks and multiple specimens were prepared with different material ratios. Next, the concrete specimens were tested for mechanical properties in the laboratory. Meanwhile, the displacement, rotation speed, torque, and sound pressure level (SPL) were observed during the drilling of the concrete blocks. Finally, the response characteristics of drilling parameters such as rotation speed, rate of penetration (ROP), torque, and SPL were analyzed. Besides, multiple prediction models of rock mechanical parameters were obtained by data analysis. The research results indicate that the drilling process can be classified into the initial stage of drilling (fast speed) and the steady stage of drilling (slow speed). The torque work ratio accounts for more than 99%, which increases with the increase in rock strength. The penetration depth per revolution and torque work ratio are significantly related to rock uniaxial compressive strength, Brazilian tensile strength, cohesion, and elastic modulus. The ROP is the best choice for estimating rock mechanical parameters. This research provides an important reference for laboratory rock mechanics parameter testing and geological features detection based on drilling parameters.

scholarly journals Weathered rock characterization using drilling parameters

2003 ◽  
Vol 40 (3) ◽  
pp. 661-668 ◽  
Author(s):  
J Sugawara ◽  
Z Q Yue ◽  
L G Tham ◽  
K T Law ◽  
C F Lee
Keyword(s):  
Coulomb Friction ◽  
Penetration Rate ◽  
Friction Angle ◽  
Drilling Process ◽  
Soil Nails ◽  
Drilling Parameters ◽  
Weathered Rocks ◽  
Drilling Parameter ◽  
Grade Ii ◽  
Rock Characterization

The characterization of weathered rocks by the use of drilling parameters is presented. Drilling parameters obtained from the drilling process monitoring system during the installation of soil nails into weathered rocks are used in this investigation. A new drilling index Pi, simplified from the concept of the specific energy, is used in an attempt to differentiate weathered rocks. With Pi or the penetration rate, boundaries of weathered rocks between (1) soil and rock ranges, and (2) grade II and grade III rocks in accordance with the six-fold rock material decomposition grade are identified. For weathered rocks in the soil range, quantitative characterization has been established in this study by using the drilling parameters. An empirical equation has been established for estimating the standard penetration resistance N value from the drilling parameter Pi, which is used in turn to determine the Mohr–Coulomb friction angle based on the work of Schmertmann. Although this approach tends to yield a slightly larger Mohr–Coulomb friction angle than that from laboratory tests, results obtained in this attempt reveal that estimation of the Mohr–Coulomb friction angle from drilling parameters is attainable with reasonable accuracy.Key words : drilling, standard penetration, percussion index, penetration rate.

scholarly journals Quantitative Detection of In-Service Strength of Underground Space Strata considering Soil-Water Interaction

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xiangfeng Lv ◽  
Hongyuan Zhou
Keyword(s):  
Water Content ◽  
Field Application ◽  
Quantitative Detection ◽  
Model Parameters ◽  
Underground Space ◽  
Drilling Process ◽  
Silty Clay ◽  
Strength Parameters ◽  
Rotary Drilling ◽  
Drilling Parameters

The in-service strength test of underground space strata is a hot issue in geotechnical engineering. In this study, we conducted mechanical analyses on the soil and the cutting bit involved in a rotary drilling process, which revealed the key factors influencing drilling. This allowed us to establish theoretical relationships among torque, propulsion, and soil strength parameters (i.e., unconfined compressive strength, shear strength, and cohesion). Moreover, with consideration of the effects of water content and geostatic stresses, we used an independently developed rotary drilling system with a 3D flexible boundary loading device to conduct 75 rotary drilling model indoor tests on silty clay in 15 groups. Based on the test results, we simplified the theoretical relationships and determined model parameters to obtain 15 quantitative relationships with 5 different water contents (4.8%, 9.7%, 14.8%, 19.6%, and 24.9%). Finally, through field application, we verified the quantitative relationships and we discussed their scope of application. The results showed it is feasible to predict the soil in-service strength based on rotary drilling parameters. Under the premise that water content is considered, the drilling parameters were found correlated linearly (correlation coefficients are all greater than 0.85) with strength parameters. In field application, absolute errors between the prediction and investigation results were less than 5%, satisfying engineering requirements.

Development of Drill Monitor and Operation Mode Recognition Based on All Hydraulic Core Drilling Rig

2011 ◽  
Vol 383-390 ◽  
pp. 1819-1824 ◽  
Author(s):  
Tao Zhang ◽  
Tai Ning Yan ◽  
Li Zhen Zhou ◽  
Chuan De An
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Operation Mode ◽  
Drilling Process ◽  
Drilling Depth ◽  
Core Drilling ◽  
Drilling Rig ◽  
Operation Modes ◽  
Drilling Parameter ◽  
Depth Increase

For rocks complexity, geologic drilling is a high cost project, and it is high risk. Drill monitor is an important tool in monitoring drilling, scientific analysis and decision. It can continuously monitor drilling process, identify and forecast abnormal operation modes. It is the key means to reduce drilling accidents and ensure high efficiency, high quality and low cost. This paper analyzed some problems of domestic drill monitor based on the research status on drill monitor at home and abroad. Author considered all hydraulic core drilling rig with 2000m drilling capacity as research object, and modularly designed multi-drilling-parameter data acquisition system according to the geologic exploration own characteristics. This system can identify typical drilling operation modes used data handling techniques of wavelet analysis and time series analysis. With implement of state geology investigation strategy, drilling workload increase greatly, drilling depth increase continuously, and the drill monitor has a very wide application prospect.

Smoothing Facilitates the Detection of Coupled Responses in Psychophysiological Time Series

2000 ◽  
Vol 14 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Joni Kettunen ◽  
Niklas Ravaja ◽  
Liisa Keltikangas-Järvinen
Keyword(s):  
Time Series ◽  
Type I Error ◽  
Electrodermal Activity ◽  
Moving Average ◽  
Type I ◽  
Facial Electromyography ◽  
Response Characteristics ◽  
Smoothing Methods ◽  
Response Systems ◽  
Different Response

Abstract We examined the use of smoothing to enhance the detection of response coupling from the activity of different response systems. Three different types of moving average smoothers were applied to both simulated interbeat interval (IBI) and electrodermal activity (EDA) time series and to empirical IBI, EDA, and facial electromyography time series. The results indicated that progressive smoothing increased the efficiency of the detection of response coupling but did not increase the probability of Type I error. The power of the smoothing methods depended on the response characteristics. The benefits and use of the smoothing methods to extract information from psychophysiological time series are discussed.

scholarly journals A Force Sensorless Method for CFRP/Ti Stack Interface Detection during Robotic Orbital Drilling Operations

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Qiang Fang ◽  
Ze-Min Pan ◽  
Bing Han ◽  
Shao-Hua Fei ◽  
Guan-Hua Xu ◽  
...  
Keyword(s):  
Cutting Force ◽  
Thrust Force ◽  
Cutting Parameters ◽  
Force Model ◽  
Drilling Process ◽  
Reinforced Plastics ◽  
Orbital Drilling ◽  
Drilling Parameters ◽  
Drilling Operations ◽  
Machining Properties

Drilling carbon fiber reinforced plastics and titanium (CFRP/Ti) stacks is one of the most important activities in aircraft assembly. It is favorable to use different drilling parameters for each layer due to their dissimilar machining properties. However, large aircraft parts with changing profiles lead to variation of thickness along the profiles, which makes it challenging to adapt the cutting parameters for different materials being drilled. This paper proposes a force sensorless method based on cutting force observer for monitoring the thrust force and identifying the drilling material during the drilling process. The cutting force observer, which is the combination of an adaptive disturbance observer and friction force model, is used to estimate the thrust force. An in-process algorithm is developed to monitor the variation of the thrust force for detecting the stack interface between the CFRP and titanium materials. Robotic orbital drilling experiments have been conducted on CFRP/Ti stacks. The estimate error of the cutting force observer was less than 13%, and the stack interface was detected in 0.25 s (or 0.05 mm) before or after the tool transited it. The results show that the proposed method can successfully detect the CFRP/Ti stack interface for the cutting parameters adaptation.

The Use of a Sensor Modules System for Measuring Drilling Parameters in a Bit, Significantly Reduces the Construction Time of Wells in Eastern Siberia

2021 ◽  
Author(s):  
Andrey Alexandrovich Rebrikov ◽  
Anton Anatolyevich Koschenkov ◽  
Anastasiya Gennadievna Rakina ◽  
Igor Dmitrievich Kortunov ◽  
Nikita Vladimirovich Koshelev ◽  
...  
Keyword(s):  
Oil And Gas ◽  
New Technologies ◽  
Field Tests ◽  
Depth Of Cut ◽  
Drilling Process ◽  
Eastern Siberia ◽  
Construction Time ◽  
Stage Of Development ◽  
Drilling Parameters ◽  
Pdc Bit

Abstract Currently, production and exploration drilling has entered a stage of development where one of the highest priority goals is to reduce the time for well construction with new technologies and innovations. One of the key components in this aspect is the utilizing of the latest achievements in the design and manufacture of rock cutting tools – drill bits. This article presents some new ideas on methods for identifying different types of vibrations when drilling with PDC bits using a system of sensors installed directly into the bit itself. In the oil and gas fields of Eastern Siberia, one of the main reasons for ineffective drilling with PDC bits are vibrations, which lead to premature wear of the cutting structure of the bit and the achievement of low ROPs in the dolomite and dolerite intervals. For efficient drilling of wells of various trajectories with a bottom hole assembly (BHA), including a downhole motor (PDM) and a PDC bit, special attention is paid to control of the bit by limiting the depth of cut, as well as the level of vibrations that occur during drilling process. Often, the existing complex of surface and BHA equipment fails to identify vibrations that occur directly on the bit, as well as to establish the true cause of their occurrence. Therefore, as an innovative solution to this problem, a system of sensors installed directly into the bit itself is proposed. The use of such a system makes it possible to determine the drilling parameters, differentiated depending on the lithological properties of rocks, leading to an increase in vibration impact. Together with the Operators, tests have been successfully carried out, which have proven the effectiveness of the application of this technology. The data obtained during the field tests made it possible to determine the type and source of vibration very accurately during drilling. In turn, this made it possible to precisely adjust the drilling parameters according to the drilled rocks, to draw up a detailed road map of effective drilling in a specific interval. Correction of drilling parameters based on the analysis of data obtained from sensors installed in the bit made it possible to reduce the resulting wear of the PDC bit cutting structure and, if necessary, make changes to the bit design to improve the technical and economic indicators. Thus, the use of a system of sensors for measuring the drilling parameters in a bit ensured the dynamic stability of the entire BHA at the bottomhole when drilling in rocks of different hardness, significantly reduced the wear of the drilling tools and qualitatively improved the drilling performance.

Study on the PDC Bit Optimization Design Based on Rotary Steering Drilling

2013 ◽  
Vol 416-417 ◽  
pp. 1874-1878
Author(s):  
Guang Ming Han
Keyword(s):  
Optimization Design ◽  
Parameter Adjustment ◽  
Profile Shape ◽  
Drilling Parameters ◽  
Pdc Bit ◽  
Drilling Parameter ◽  
Drilling System ◽  
Gauge Structure ◽  
Design Result

According to a series of characteristics produced from the side cutting in the rotary steering drilling system, PDC bit is improved from the profile shape, cutting structure, and gauge structure. Also, suggestions are proposed according to the drilling parameters of operation. The study result shows that the requirements of the rotary steering drilling system can be fulfilled by PDC bit design result and drilling parameter adjustment.

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