Analysis on the Influence Factors of Well Deviation in Gas Drilling

2012 ◽  
Vol 577 ◽  
pp. 132-136
Author(s):  
Shi Hui Sun ◽  
Tie Yan ◽  
Xue Liang Bi ◽  
Peng Wang
Keyword(s):  
Stress State ◽  
Stress Distribution ◽  
Negative Pressure ◽  
Drilling Fluid ◽  
Influence Factors ◽  
Rock Breaking ◽  
Well Bore ◽  
Gas Drilling ◽  
Breaking Mechanism ◽  
Bottom Rock

Well deviation control has become a bottleneck restraining the development of gas drilling. Without lubrication of drilling fluid and the existence of negative pressure differential, the reasons of well deviation in gas drilling are different from in mud drilling. The effects of stress distribution difference, rock-breaking mechanism, well bore enlargement and water export on well deviation during both gas drilling and mud drilling are compared and studied on the basis of the previous studies in this paper. The conclusion demonstrates that the new stress state of the bottom rock, the uneven crater which is formed by rock breaking and the borehole enlargement are the main causes of well deviation during gas drilling.

Study on Rock-Breaking Simulation and Experiment of Double Disc Cutter of TBM

2016 ◽  
Vol 23 ◽  
pp. 80-88
Author(s):  
F. Lu ◽  
C. Zhang ◽  
J. Sun ◽  
J.X. Tian ◽  
M. Liu ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Disc Cutter ◽  
Element Analysis ◽  
Breaking Effect ◽  
The Finite Element Analysis ◽  
Breaking Mechanism ◽  
Simulation And Experiment ◽  
Tbm Cutter ◽  
Cutter Spacing ◽  
The Impact

In order to improve working efficiency of the tunneling process and extend working life of disc cutter, explore the impact of cutter spacing and loading for the cutter rock-breaking effect. With the theory of rock crushing, Based on the finite element analysis software ABAQUS, the process of disc cutter breaking rock is simulated, considering the adjacent cutters sequential constraints, then, to make sure two cutter space with the method of SE in experiment.The simulation results showed that the optimal cutter spacings were both about 80mm in the same loading and the sequentially loading, but the rock-breaking effect of sequentially loading is better than the same loading. The experimental data showed that the minimum specific energy of rock breaking is appeared cutter spacing between 80mm and 90mm. Thus, the correctness and rationality of the simulation was verified. The study is good for understanding the rock-breaking mechanism of double disc cutter and has a certain promoting value to optimize TBM cutter system.Keywords:TBM, rock fragmentation, ABAQUS, cutter spacing, sequentially cutting

Heat Moisture Modified Rice Flours as Additive in Drilling Fluids

2021 ◽  
Vol 80 (1) ◽  
pp. 62-72
Author(s):  
Bunyami Shafie ◽  
Lee Huei Hong ◽  
Phene Neoh Pei Nee ◽  
Fatin Hana Naning ◽  
Tze Jin Wong ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Drilling Fluid ◽  
Low Cost ◽  
Health Concern ◽  
Drilling Fluids ◽  
Drilling Mud ◽  
Fluid Mixture ◽  
Gas Drilling ◽  
Water Based ◽  
Rice Flours

Drilling mud is a dense, viscous fluid mixture used in oil and gas drilling operations to bring rock cuttings to the earth's surface from the boreholes as well as to lubricate and cool the drill bit. Water-based mud is commonly used due to its relatively inexpensive and easy to dispose of. However, several components and additives in the muds become increasingly cautious and restricted. Starch was introduced as a safe and biodegradable additive into the water-based drilling fluid, in line with an environmental health concern. In this study, the suitability of four local rice flours and their heat moistures derivatives to be incorporated in the formulation of water-based drilling fluid was investigated. They were selected due to their natural amylose contents (waxy, low, intermediate, and high). They were also heat moisture treated to increase their amylose contents. Results showed that the addition of the rice flours into water-based mud significantly reduced the density, viscosity, and filtrate volume. However, the gel strength of the mud was increased. The rice flours, either native or heat moisture treated, could serve as additives to provide a variety of low cost and environmentally friendly drilling fluids to be incorporated and fitted into different drilling activity.

Influence of Sensitive Parameters on Pressure Wave Velocity of Gas Drilling Fluid

2021 ◽  
Author(s):  
Jiangang Shi ◽  
Wenhui Dang ◽  
Zhenxin Jiang ◽  
Hengzhi Chu ◽  
Yingjie Wang ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Pressure Wave ◽  
Drilling Fluid ◽  
Gas Drilling ◽  
Sensitive Parameters

Surface thermal stress distribution and the influence factors of Sapphire/AlN/GaN epilayers

2016 ◽  
Vol 45 (10) ◽  
pp. 1021001
Author(s):  
陈 靖 Chen Jing ◽  
程宏昌 Cheng Hongchang ◽  
吴玲玲 Wu Lingling ◽  
冯 刘 Feng Liu ◽  
苗 壮 Miao Zhuang
Keyword(s):  
Thermal Stress ◽  
Stress Distribution ◽  
Influence Factors ◽  
Thermal Stress Distribution

scholarly journals Rock Breaking Mechanism and Drilling Performance of Harmonic Vibro-Impact Drilling

2020 ◽  
Vol 570 ◽  
pp. 022036
Author(s):  
Siqi Li ◽  
Shenglei Tian ◽  
Wei Li ◽  
Zhao Huan ◽  
Xin Ling ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Drilling Performance ◽  
Breaking Mechanism

scholarly journals Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaoming Lou ◽  
Bao Wang ◽  
En Wu ◽  
Mingwu Sun ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Cutting Parameters ◽  
Rock Breaking ◽  
Theoretical Solution ◽  
Critical Depth ◽  
Forming Mechanism ◽  
Breaking Mechanism ◽  
Numerical Research ◽  
Explosive Properties ◽  
Dip Angle

This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy.

New Strong Inhibitory Polyamine Drilling Fluid System Research in Yubei Area

2013 ◽  
Vol 807-809 ◽  
pp. 2519-2522
Author(s):  
Wan Long Huang ◽  
Yi Shan Lou ◽  
Liang Zhu ◽  
Zhong Hui Li
Keyword(s):  
Water Pollution ◽  
High Pressure ◽  
Salt Water ◽  
Drilling Fluid ◽  
Well Bore ◽  
System Research ◽  
Fluid System ◽  
Temperature Resistance ◽  
Evaluation Test ◽  
Made In

Yubei area exist thick mud shale, mudstone, gypsum mudstone and high pressure brine formation. In the course of drilling, the problems are most conspicuous which include well bore instability, bit balling and so on. In allusion to complex formation and complex accident, the polyamine form strong inhibitory polyamine collapse prevention drilling fluid on the basis of KCl-polysulfonate drilling fluid system was used in Yubei area. After the analysis on the mechanism of the strong inhibitory polyamine polymer drilling fluid system, the polyamine performance evaluation test made in laboratory shows that the drilling fluid system has good rheological property, high temperature resistance, clay and salt water pollution resistance. This drilling fluid system cooperate with KCl improve the ability of inhibition of drilling fluid, meet the requirements of stabilize borehole wall, which carried on the field test in YB A well has obtained good application effect.

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