scholarly journals Migration Characteristics of Boring Mud in Roadway Floor Anchor Wire Hole and Test in Coal Mine

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Hui Zhang ◽  
Weihan Han ◽  
Youlin Xu ◽  
Mengzhi Zhu ◽  
Zhanyang Liu ◽  
...  
Keyword(s):  
Coal Mine ◽  
Drilling Fluid ◽  
Working Environment ◽  
Hole Drilling ◽  
Bottom Plate ◽  
Drilling Depth ◽  
Anchor Cable ◽  
Discharge Operation ◽  
Reverse Circulation ◽  
Fundamental Reason

Given the difficulty in drilling the anchor holes in the roadway floor of the coal mine, the characteristics of slag movement in the process of positive and negative circulation drilling are analyzed. It is concluded that the interaction between the three zones of drilling and slag is the fundamental reason restricting the rapid drilling of the anchor cable hole in the floor, and it is proposed that the pump reverse circulation drilling can effectively prevent the formation of the three zones of drilling and slag. According to the actual situation, the relationship between drilling depth, vacuum degree of the pump, and the velocity of drilling fluid and the volume of drilling slag is obtained. The results show that the pump suction reverse circulation is feasible for the rapid drilling of the anchor hole of the floor. A set of pump suction reverse circulation drilling systems has been developed, and floor anchor wire hole drilling and slag discharge operation at the same time were realized. The field test shows that the effective drilling time of the anchor cable hole in the depth of 5.6 m can be controlled within 30 min, which solves the problem of deep hole drilling in the anchor hole of the bottom plate and purifies the working environment.

Improving the Working Environment and Drilling Economics Through Better Understanding of Oil-Based Drilling Fluid Chemistry

2000 ◽  
Vol 15 (04) ◽  
pp. 254-260 ◽  
Author(s):  
R.W. James ◽  
T. Schei ◽  
P. Navestad ◽  
T.A. Geddes ◽  
M.G. Nelson ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Working Environment ◽  
Fluid Chemistry

Eccentric String Reamer for ECD Reduction in the Depleted Field of Gulf of Thailand GoT

2021 ◽  
Author(s):  
Nichnita Tortrakul ◽  
Chatwit Pochan ◽  
Nardthida Kananithikorn ◽  
Thanapong Siripan ◽  
Basil Ching ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Low Cost ◽  
Operating Cost ◽  
Cost Effective ◽  
Operational Reliability ◽  
Drill String ◽  
Fluid Loss ◽  
Gulf Of Thailand ◽  
Drilling Depth ◽  
Annular Clearance

Abstract This paper presents a method of reducing equivalent circulating density (ECD) while drilling using eccentric string reamers (ESR) with adjustable gage stabilizer (AGS) in Gulf of Thailand (GoT). Reduced ECD in slimhole is desirable when drilling depleted reservoirs as reduced borehole pressure can reduce or delay drilling fluid loss events. Delaying losses can allow well depth to be increased with the prospect of penetrating otherwise unrealized pay horizons and increasing reserves capture. Several methods of reducing ECD were considered but most solutions included changing drill string and/or casing design specifications with prohibitive cost. A low-cost, low operational-impact solution was needed. Hole-opening is a method of increasing annular clearance, but well delivery requirements of ~4.5 days per well necessitates a one-trip solution without introducing significant ROP reduction or negatively impact bottomhole assembly (BHA) walking tendencies. Further, the preferred solution must be compatible with a high temperature reservoir drilling environment and must not undermine drilling system operational reliability. A simple but controversial tool for hole opening is ESR. ESR’s are simple in that there are no moving parts or cutter blocks to shift, and operating cost is low. They are controversial due to uncertainty that the tool eccentricity and drilling dynamics will successfully open hole to the desired diameter. Given that the intent of this hole-opening application is limited to creating annular clearance for fluid, not mechanical clearance, the eccentric reamer solution was chosen for field trial and potential development. A tool design challenge was to create a reamer geometry with the desired enlargement ratio (6⅛-in. to 6⅞-in.) while drilling, and reliably drift surface equipment and casing without complications. The ESR design must efficiently drill-out cement and float equipment as well as heterogeneous shale/sand/mudstone interbedded formation layers without significant vibration. If successful, the enlarged hole diameter will increase annular clearance, reduce ECD, improve hole cleaning, and allow drilling depth to be increased to capture additional reserves The plug and play functionality of the ESR required no changes to the existing rig site procedures in handling and making up the tool. The ESR drifts the casing and drills cement and shoe track with normal parameters. The ESR is run with standard measurements-while-drilling (MWD)/logging-while-drilling (LWD) AGS BHA and is able to reduce ECD providing the opportunity to drill deeper and increase barrel of oil equivalent (BOE) per each wellbore. Performance analysis has shown no negative effect on drilling performance and BHA walking tendency. The novelty of this ESR application is its proven ability to assist in increasing reserves capture in highly depleted reservoirs. The ESR is performing very efficiently (high ROP) and reliability is outstanding. In this application, the ESR is a very cost-effective and viable solution for slimhole design.

Improving the rheological properties of water-based calcium bentonite drilling fluids using water-soluble polymers in high temperature applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jinliang Liu ◽  
Fengshan Zhou ◽  
Fengyi Deng ◽  
Hongxing Zhao ◽  
Zhongjin Wei ◽  
...  
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
Apparent Viscosity ◽  
Drilling Fluid ◽  
Shear Thickening ◽  
Water Soluble ◽  
Drilling Fluids ◽  
Drilling Depth ◽  
Filtration Loss ◽  
Calcium Bentonite

Abstract Most of bentonite used in modern drilling engineering is physically and chemically modified calcium bentonite. However, with the increase of drilling depth, the bottom hole temperature may reach 180 °C, thus a large amount of calcium bentonite used in the drilling fluid will be unstable. This paper covers three kinds of calcium bentonite with poor rheological properties at high temperature, such as apparent viscosity is greater than 45 mPa·s or less than 10 mPa·s, API filtration loss is greater than 25 mL/30 min, which are diluted type, shear thickening type and low-shear type, these defects will make the rheological properties of drilling fluid worse. The difference is attributed to bentonite mineral composition, such as montmorillonite with good hydration expansion performance. By adding three kinds of heat-resistant water-soluble copolymers Na-HPAN (hydrolyzed polyacrylonitrile sodium), PAS (polycarboxylate salt) and SMP (sulfomethyl phenolic resin), the rheological properties of calcium bentonite drilling fluids can be significantly improved. For example, the addition of 0.1 wt% Na-HPAN and 0.1 wt% PAS increased the apparent viscosity of the XZJ calcium bentonite suspension from 4.5 to 19.5 mPa·s at 180 °C, and the filtration loss also decreased from 20.2 to 17.8 mL.

Research on Bursting Liability and its Preventive Measures of -906m Deep Coal and Rock in Zhuji Coal Mine

2012 ◽  
Vol 170-173 ◽  
pp. 428-433 ◽  
Author(s):  
Dong Ming Guo ◽  
Hua Jun Xue ◽  
Li Juan Li ◽  
Jun Long Xue ◽  
Gui He Li
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Water Injection ◽  
Elastic Strain Energy ◽  
Hole Drilling ◽  
Energy Index ◽  
Deep Mining ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
The Impact

Rock burst is a common mine dynamic phenomenon in the world, and the research on bursting liability of coal and rock is the foundation of rock burst’s prevention and treatment. This paper has a research on bursting liability of coal and rock of 11-2 coal seam which is the main coal seam of Zhuji coal mine, and through the research and analysis of coal seam burst energy index(bursting energy index, elastic strain energy index, duration of dynamic fracture) and rock seam burst energy index(bending energy index), this paper given that seam and rock in deep mining section of Zhuji coal mine has bursting liability, put forward a series of countermeasures such as the previous water injection, hole-drilling method, blasting distressing to the coal seam with the impact disaster for deep mining in Zhuji coal mine.

The Green Design of Bracket of Scraper Part of Coal Mine Underground Horizontal Extension Transfer Machine

2012 ◽  
Vol 591-593 ◽  
pp. 44-47 ◽  
Author(s):  
Ping Huai Mao ◽  
Li Ding ◽  
Jing Xi Li
Keyword(s):  
Coal Mine ◽  
Working Environment ◽  
Green Design ◽  
Main Bearing

Recently, transporting coal in the coal mine is poor efficiency and too costly. Coal mine underground horizontal extension transfer machine is used to transport coal faster and better. To resolve the problem how to connect the scraper conveyer with tramcar in this system, the design of the bracket has been brought up. The bracket of scraper part is the main bearing of coal mine underground horizontal extension transfer machine, and all the scraper conveyer must be fixed in the bracket. In addition, the design of the bracket of scraper part not only considers the rationality in the structure, but also considers the effect of the environment. The system works in extreme circumstances, but the green design can resolve it. It can effectively combine the choice of material, the structure of the bracket, the methods of technology with exterior styling, reflecting the human, machine of harmony with the working environment.

scholarly journals A mine main fans switchover system with lower air flow volatility based on improved particle swarm optimization algorithm

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401982928 ◽  
Author(s):  
Hengqing Ge ◽  
Guang Xu ◽  
Jinxin Huang ◽  
Xiaoping Ma
Keyword(s):  
Particle Swarm Optimization ◽  
Coal Mine ◽  
Optimization Algorithm ◽  
Particle Swarm Optimization Algorithm ◽  
Air Flow ◽  
Particle Swarm ◽  
Underground Mine ◽  
Working Environment ◽  
Swarm Optimization ◽  
Improved Particle Swarm Optimization

A reliable ventilation system is essential for maintaining a comfortable working environment and ensuring safety production in an underground coal mine. The automated fan switchover technique was developed for changing the main fan for maintenance with lower air flow volatility of underground mine in the switchover process. This article established the optimization model in the main fans switchover process, used the improved particle swarm optimization algorithm to solve the model, and achieved minimum air flow volatility in the fans switchover process. Compared to previous studies, computer simulations have shown that the proposed algorithm can effectively find the global optimal solution with less initial parameters and achieved lower air flow volatility in underground mine. The particle swarm optimization solution, searching diversity, prevents it from confining to local optimal solutions and enhances convergence. The reasonable step length is beneficial to reduce the air flow volatility and main fans switchover time. The air flow volatility is larger comparatively when some doors are nearly open or closed fully at the start–stop phase of the switchover process. A case application in a China’s domestic coal mine shows that the air flow volatility of the underground mine in the main fans switchover process is no more than 0.4%.

scholarly journals Casing while Drilling – a Viable Alternative to Conventional Drilling

2019 ◽  
Vol 290 ◽  
pp. 10003
Author(s):  
Ion Foidaş ◽  
Dan-Paul Ștefănescu ◽  
Mihai Serbancea
Keyword(s):  
New Technologies ◽  
Drilling Fluid ◽  
Mechanical Energy ◽  
Viable Alternative ◽  
Drilling Process ◽  
Drilling Depth ◽  
Drilling String ◽  
Drilling Time ◽  
Productive Time ◽  
Conventional Drilling

Mankind’s increased requirement for and dependence on energy resources, including the resources resulting from discovery and development of new hydrocarbon commercial reservoirs involves the use of new technologies such as optimization of the drilling process by reducing the non-productive time, the costs and the risks. Casing while drilling involves elimination of classical drilling string by using the casing string both for transmission to the bit of the mechanical energy and for circulation of drilling fluid into the well. Although there is a number of technical or perception barriers related to the use of casing drilling, the important benefits of this technology related to reduced drilling time and problems associated to the drilling string make it an increasingly viable alternative to conventional drilling. The experience in applying this technology has proven that it can reduce the time of well execution and sometimes it lowers the costs in relation to drilling depth.

Comparative Analysis of Coal Mining Disasters in Turkey

2021 ◽  
Vol 5 (19) ◽  
Author(s):  
ilker İNAN
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Developed Countries ◽  
Working Environment ◽  
Analysis Method ◽  
Situation Analysis ◽  
Important Place ◽  
The World ◽  
Future Situation ◽  
Mine Accidents

Use of coal mine is based on centuries, but the expansion of its usage area has been after the Industrial Revolution in parallel with other mines. With the effect of this revolution; The use of minerals such as coal, iron, copper and tin has increased. Among these mines, coal mine; It has a very important place because it can be used for industrialization, powering machines, generating electricity and heating. In order to provide the increasing need in these areas every year, coal enterprises were established in countries with rich coal deposits and served the energy sector. The share of coal in the energy resources consumed in the world has increased in a short time and has become a determining factor on the world economy. This situation has led to an increase in the number of coal mine enterprises, with developed countries turning to the mining sector for industrialization and economic progress. Accidents in coal mines have increased as the number of mines has grown. Despite the fact that numerous studies have been conducted to prevent these accidents, accidents still occur. Coal mining is regarded as a hazardous work environment due to the high frequency of accidents and their consequences. To minimize these risks and ensure a healthy working environment, the required infrastructure should be established, audit-oriented studies should be conducted, and flaws should be remedied based on the findings. Within the scope of the study, the way and types of coal mine accidents, which are common in Turkey, were investigated, as well as a literature analysis of the reasons of these accidents. The number of accidents and casualties between 2015-2020 were examined and a future situation analysis was made. Regression Analysis Method, one of the statistical analysis methods, was used in the situation analysis phase. The number of coal mine accidents and fatalities in countries around the world since 1902, has been studied. By using the same Analysis Method, the future situation analysis for the next 10 years was made in the light of the data between 1902-2020, and data on the number of accidents and casualties that may occur in the coal mining area were obtained.

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