scholarly journals Dynamic Reliability Analysis of Rotary Steering Drilling System

2019 ◽  
Vol 10 (1) ◽  
pp. 79-90
Author(s):  
Leilei Huang ◽  
Qilong Xue ◽  
Baolin Liu ◽  
Chunxu Yang ◽  
Ruihe Wang ◽  
...  
Keyword(s):  
Optimization Design ◽  
Drilling Fluid ◽  
Assessment Method ◽  
Calculation Model ◽  
Drilling Tool ◽  
Dynamic Reliability ◽  
Bottom Hole ◽  
Inherent Frequency ◽  
Bottom Hole Assembly ◽  
Drilling System

Abstract. Vibration and high shock are major factors in the failure of downhole tools. It is important to study the causes of vibration and shock formation to prevent failure of the drillstring and bottom hole assembly (BHA). At present, it is generally recognized that the vibration of drillstring is the main reason for the failure, especially the lateral vibration. In this paper, the bottom tool of Rotary Steering Drilling System (RSS) calculation model was established based on the secondary development of ABAQUS software. Starting from the initial configuration of drilling tool, considering the contact impact of drilling tool and borehole wall, the dynamic excitation of guide mechanism and the drilling pressure, torque, rotational speed, gravity, buoyancy, drilling fluid damping. The dynamic characteristics of the inherent frequency and dynamic stress of the bottom hole assembly (BHA) were calculated and analyzed, and risk assessment method based on the quantitative vibration intensity was established. The reliability of typical drilling tool is evaluated, which provides a reference for the optimization design of BHA of Rotary Steering Drilling System.

scholarly journals Kinematics and dynamics analysis of new rotary-percussive PDM drilling tool

2021 ◽  
pp. 146134842198915
Author(s):  
Jialin Tian ◽  
Xuehua Hu ◽  
Liming Dai ◽  
Lin Yang ◽  
Yi Yang ◽  
...  
Keyword(s):  
Drill String ◽  
Structure Design ◽  
Drilling Process ◽  
Analysis Model ◽  
Drilling Tool ◽  
Stick Slip ◽  
Rate Of Penetration ◽  
Bottom Hole ◽  
Bottom Hole Assembly ◽  
The Impact

This paper presents a new drilling tool with multidirectional and controllable vibrations for enhancing the drilling rate of penetration and reducing the wellbore friction in complex well structure. Based on the structure design, the working mechanism is analyzed in downhole conditions. Then, combined with the impact theory and the drilling process, the theoretical models including the various impact forces are established. Also, to study the downhole performance, the bottom hole assembly dynamics characteristics in new condition are discussed. Moreover, to study the influence of key parameters on the impact force, the parabolic effect of the tool and the rebound of the drill string were considered, and the kinematics and mechanical properties of the new tool under working conditions were calculated. For the importance of the roller as a vibration generator, the displacement trajectory of the roller under different rotating speed and weight on bit was compared and analyzed. The reliable and accuracy of the theoretical model were verified by comparing the calculation results and experimental test results. The results show that the new design can produce a continuous and stable periodic impact. By adjusting the design parameter matching to the working condition, the bottom hole assembly with the new tool can improve the rate of penetration and reduce the wellbore friction or drilling stick-slip with benign vibration. The analysis model can also be used for a similar method or design just by changing the relative parameters. The research and results can provide references for enhancing drilling efficiency and safe production.

The Theory and the Practical Validation of the Fluid Level Position in the Annulus During Lost Circulation

2021 ◽  
Author(s):  
Alexey Ruzhnikov ◽  
Edgar Echevarria
Keyword(s):  
Flow Rate ◽  
Drilling Fluid ◽  
Time Interval ◽  
Fluid Level ◽  
Drilling Tool ◽  
Lost Circulation ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Bottom Hole ◽  
Carbonate Formations

Abstract Carbonate formations around the world and specifically in a Middle East are prone to have total losses while drilling. And the nature of the losses often related to the highly fractured formations of the pay zone. When such fracture(s) is crossed by the wellbore the lost circulation initiated and led to a drilling without a return to a surface. To avoid undesired well control event or wellbore instability and to maintain the constant bottom hole pressure the mud cap drilling strategy often used as a preventative measure. The mud cap can be either the continuous or based on some volume or time interval, depends on the local practices or the policy of an operator. The mud cap flow rate as well as mud cap mud weight are often based on the best practices, not supported by an engineering study. To understand the behavior of the drilling fluid level in the annulus while drilling with total losses the drilling bottom hole assembly equipped with annular pressure while drilling tool was used. As the drilling required to use the continuous mud cap, then the specific guideline was developed on measurement of the bottom hole pressure and further conversion of it to the fluid level. The study was performed across pay zone with one or several loss circulation zones identified. As the result it was confirmed that the used mud cap flow rate had minor to none effect on the fluid level position in the annulus and that the bottom hole pressure remained the same. It showed as well that different loss zones are behaving in a different way, what can be considered as a factor affecting their ability to be sealed. The obtained knowledge and the information should help to understand better the loss circulation behavior as well be an important step toward development of the product which may cure the losses in high fractured carbonate formations. The results of the study can be implemented in any other project or a field.

scholarly journals Research on Overflow Monitoring Mechanism Based on Downhole Microflow Detection

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Liang Ge ◽  
Ze Hu ◽  
Ping Chen ◽  
Lei Shi ◽  
Qing Yang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Flow Measurement ◽  
Drilling Fluid ◽  
Rate Variation ◽  
Lost Circulation ◽  
Bottom Hole ◽  
Managed Pressure Drilling ◽  
Type Flow ◽  
Drilling System ◽  
The Cost

The flow rate variation of the drilling fluid and micro-overflow loss is difficult to analyze. The purpose to prevent the occurrence of kick, lost circulation, and other complex conditions is not easy to be achieved. Therefore, the microflow-induced annulus multiphase flow rate and annulus pressure field model were studied, and a downhole microflow measurement system has been developed. A differential pressure type flow measurement was used in the system, and real-time downhole information was obtained to achieve deep, narrow windows and other safety-density complex formation security. This paper introduced a new bottom-hole flow meter which can measure the annular flux while drilling and monitor overflow and circulation loss. The accuracy and reliability of the MPD (managed pressure drilling) system can be improved obviously by applying the device; as a result, the safety of drilling is enhanced and the cost is reduced.

Study on Wind Load Performance for L Type Aerial Work Suspended Platform

2012 ◽  
Vol 479-481 ◽  
pp. 2013-2016
Author(s):  
Hui Ye Yu ◽  
Liang Zhao ◽  
Ke Zhang ◽  
Yu Hou Wu
Keyword(s):  
Optimization Design ◽  
Natural Vibration ◽  
Wind Load ◽  
Calculation Model ◽  
Vibration Period ◽  
Design And Optimization ◽  
Load Calculation ◽  
Wind Vibration ◽  
Inherent Frequency ◽  
Wind Vibration Coefficient

Based on the wind load calculation model increases Suspended Platform vibration characteristics of wind vibration coefficient, and gets Suspended Platform natural vibration period and inherent frequency by ANSYS finite element modal analysis, then determines the wind vibration coefficient, calculates the wind load of Suspended Platform in working state and non-working state. Aiming at three different conditions, analyzes the platform structure in the wind load the stress intensity and deformation. Through analysis to finds the most dangerous positions of Suspended Platform in three different conditions, provides effective references for the L Type Suspended Platform in wind-resistant design and optimization design.

scholarly journals TECHNOLOGY SOLUTION FOR IMPROVEMENTOF THE PDC DRILL BITS PERFORMANCE

2016 ◽  
pp. 84-87
Author(s):  
L. B. Khuzina ◽  
A. F. Shaikhutdinova
Keyword(s):  
Oil And Gas ◽  
Gas Wells ◽  
Bottom Hole ◽  
Drill Bits ◽  
Bottom Hole Assembly ◽  
Economic Indexes ◽  
Drilling System ◽  
Drill Pipes ◽  
Technology Solution ◽  
Pilot Tests

The article is devoted to the problem of bringing the desired load to the drill bit and improving the technical and economic indexes of drilling at drilling the oil and gas wells. The authors propose a bottom-hole assembly (BHA) consisting of PDC bits, downhole oscillator, screw downhole motor, measuring-while drilling system and drill pipes. The results of the proposed assembly pilot tests are presented. The tests were conducted in well No. 6053 in Sheremetyev field, Tatarstan Republic.

scholarly journals An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

2014 ◽  
Vol 6 ◽  
pp. 935159 ◽  
Author(s):  
Feng Guan ◽  
Weiguo Ma ◽  
Yiliu Tu ◽  
Chuanxi Zhou ◽  
Ding Feng ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Partial Pressure ◽  
Engineering Practice ◽  
Straight Tube ◽  
Curvature Ratio ◽  
Pressure Losses ◽  
Coiled Tubing ◽  
Bottom Hole ◽  
Bottom Hole Assembly ◽  
Drilling System

Coiled tubing drilling has become an important development direction of drilling. The method of combining theoretical calculation with the experimental verification is adopted to analyze the flow of the coiled tubing drilling system. A set of experimental bench is developed, three kinds of curvature ratio of coiled tubing are used, and the frictional pressure losses of coiled tubing and partial pressure drop of each downhole tool are tested. The results of experiments with water agree well with rough pipe calculation model. The pressure losses of coiled tube are obviously larger than that of straight tube, and the value of it is about 11–17%. The larger the curvature ratio is, the more the pressure losses of coiled tubing are. The fluid experiment with the polymer presents obviously the drag reduction effect. Experiment of simulated bottom hole assembly shows that partial pressure drop of bottom hole assembly is large. It has a little effect on the pressure losses of coiled tubing when whole bottom hole assemblies are connected. The research results can be used as the basis for formulating coiled tubing drilling process parameters, which will provide a guide for engineering practice.

Implementation of a Bottom-Hole Assembly Program

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Kenneth Bhalla ◽  
Lixin Gong ◽  
George K. McKown
Keyword(s):  
Drilling Fluid ◽  
Computationally Efficient ◽  
Shock Absorbers ◽  
Bottom Hole ◽  
Weight On Bit ◽  
Measurement While Drilling ◽  
Bottom Hole Assembly ◽  
Reaction Forces ◽  
Dip Angle ◽  
Drill Collar

A state of the art graphical user interface program has been developed to predict and design the bottom-hole assembly (BHA) performance for drilling. The techniques and algorithms developed in the program are based on those developed by Lubinski and Williamson. The BHA program facilitates conducting parametric studies and making field decisions for optimal BHA performance. The input parameters may include formation class, dip angle, hole size, drill collar size, number of stabilizers, and stabilizer spacing. The program takes into consideration bit-formation characteristics and interaction, drilling fluid weight, drill collar sizes, square collars, shock absorbers, measurement while drilling tools, reamer tools, directional tools, rotary steerable systems, etc. The output may consist of hole curvature (buildup or drop rate), hole angle, and weight on bit and is presented in drilling semantics. Additionally, the program can perform mechanical analyses and can solve for the bending moments and reaction forces. Moreover, the program has the capability to predict the wellpath using a drill ahead algorithm. The program consists of a mathematical model that makes assumptions of 2D, static, and constant hole curvature, resulting in a robust computationally efficient tool that produces rapid reliable results.

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