scholarly journals Cuttings Transport Models and Experimental Visualization of Underbalanced Horizontal Drilling

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Na Wei ◽  
YingFeng Meng ◽  
Gao Li ◽  
LiPing Wan ◽  
ZhaoYang Xu ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Transport Theory ◽  
Flow Mechanism ◽  
Cuttings Transport ◽  
Transport Models ◽  
Horizontal Drilling ◽  
Injection Volume ◽  
Drilling Technology ◽  
Large Plane ◽  
Core Issues

Aerated underbalanced horizontal drilling technology has become the focus of the drilling industry at home and abroad, and one of the engineering core issues is the horizontal borehole cleaning. Therefore, calculating the minimum injection volume of gas and liquid accurately is essential for the construction in aerated underbalanced horizontal drilling. This paper establishes a physical model of carrying cuttings and borehole cleaning in wellbore of horizontal well and a critical transport mathematical model according to gas-liquid-solid flow mechanism and large plane dunes particle transport theory.

scholarly journals Cuttings-carried theory and erosion rule in gas drilling horizontal well

2014 ◽  
Vol 18 (5) ◽  
pp. 1695-1698 ◽  
Author(s):  
Na Wei ◽  
Ying-Feng Meng ◽  
Gao Li ◽  
Yong-Jie Li ◽  
An-Qi Liu ◽  
...  
Keyword(s):  
High Speed ◽  
Horizontal Well ◽  
Horizontal Drilling ◽  
Solid Flow ◽  
Injection Volume ◽  
Solid Mixture ◽  
Gas Drilling ◽  
Strong Erosion

In gas horizontal drilling, the gas with cuttings will go through the annulus at high speed which will lead strong erosion to the drill tools. This paper proposes a cuttings-carried theory and modified the critical cuttings-carried model for the gas-solid flow. Meanwhile, the erosive energy is obtained through simulating the gas-solid mixture in different conditions. The study result has positive significance on the determination of reasonable injection volume by optimizing construction parameters of horizontal well in gas drilling.

Optimization Technique in Double Stepped Thin Horizontal Well

2013 ◽  
Vol 734-737 ◽  
pp. 1226-1229
Author(s):  
Sen Fan ◽  
Yue Xiang Li ◽  
Jin Qiang Cao ◽  
Jian Bo Xie
Keyword(s):  
Horizontal Well ◽  
Optimization Technique ◽  
Oil Industry ◽  
Drilling Speed ◽  
Horizontal Drilling ◽  
Drilling Technology ◽  
Further Development ◽  
At Home

Oil industry at home and abroad has paid attention to the usage of horizontal well with the development of horizontal drilling technology, the number of horizontal well is increasing year by year inland, but some horizontal well constructions in thin oil pay is not ideal. Nanzhong 1H well has used double stepped horizontal well technology to develop thin oil pay, it has optimized the constructions in different stages and combined the steering technique in the drilling practice of thin oil pay, it has accelerated the drilling speed and reached the target fast and safely. It provides the reference for the further development of deep thin oil pay of horizontal well technology.

scholarly journals Numerical and experimental investigation on the depressurization capacity of a new type of depressure-dominated jet mill bit

2020 ◽  
Vol 17 (6) ◽  
pp. 1602-1615
Author(s):  
Xu-Yue Chen ◽  
Tong Cao ◽  
Kai-An Yu ◽  
De-Li Gao ◽  
Jin Yang ◽  
...  
Keyword(s):  
Flow Rate ◽  
Rate Ratio ◽  
Area Ratio ◽  
Low Flow ◽  
Flow Rate Ratio ◽  
Cuttings Transport ◽  
Horizontal Drilling ◽  
Hole Cleaning ◽  
Bottom Hole ◽  
New Type

AbstractEfficient cuttings transport and improving rate of penetration (ROP) are two major challenges in horizontal drilling and extended reach drilling. A type of jet mill bit (JMB) may provide an opportunity to catch the two birds with one stone: not only enhancing cuttings transport efficiency but also improving ROP by depressuring at the bottom hole. In this paper, the JMB is further improved and a new type of depressure-dominated JMB is presented; meanwhile, the depressurization capacity of the depressure-dominated JMB is investigated by numerical simulation and experiment. The numerical study shows that low flow-rate ratio helps to enhance the depressurization capacity of the depressure-dominated JMB; for both depressurization and bottom hole cleaning concern, the flow-rate ratio is suggested to be set at approximately 1:1. With all other parameter values being constant, lower dimensionless nozzle-to-throat-area ratio may result in higher depressurization capacity and better bottom hole cleaning, and the optimal dimensionless nozzle-to-throat-area ratio is at approximately 0.15. Experiments also indicate that reducing the dimensionless flow-rate ratio may help to increase the depressurization capacity of the depressure-dominated JMB. This work provides drilling engineers with a promising tool to improve ROP.

Optimized Horizontal Well Placement in the Otter Field, North Sea using New Formation Imaging While Drilling Technology

2003 ◽  
Author(s):  
Ian Tribe ◽  
Gordon Holm ◽  
Stuart Harker ◽  
Christian Longis ◽  
Keith Milne ◽  
...  
Keyword(s):  
North Sea ◽  
Horizontal Well ◽  
Well Placement ◽  
Drilling Technology ◽  
New Formation

Study on Drilling and Completion Techniques of Horizontal well for Coalbed Methane

2014 ◽  
Vol 513-517 ◽  
pp. 2586-2589 ◽  
Author(s):  
Xin Feng Du ◽  
Yong Zhe Zhao
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Horizontal Well ◽  
Horizontal Wells ◽  
Mining Area ◽  
Variable Density ◽  
Technical Problems ◽  
Development Direction ◽  
Drilling Technology ◽  
The Many

Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.

Experimental Study on the Wellbore-Cleaning Efficiency of Microhole-Horizontal-Well Drilling

SPE Journal ◽  
2017 ◽  
Vol 22 (04) ◽  
pp. 1189-1200 ◽  
Author(s):  
Xianzhi Song ◽  
Zhengming Xu ◽  
Mengshu Wang ◽  
Gensheng Li ◽  
S. N. Shah ◽  
...  
Keyword(s):  
Flow Rate ◽  
Horizontal Well ◽  
High Efficiency ◽  
Flow Loop ◽  
Cuttings Transport ◽  
Volumetric Concentration ◽  
Cleaning Efficiency ◽  
Rotary Drilling ◽  
Well Drilling ◽  
Cuttings Bed

Summary Microhole-drilling technology is a high-efficiency and low-cost technology that has developed rapidly in recent years. However, during microhole-horizontal-well drilling, cuttings are easy to deposit at the bottom of the wellbore because of gravity and nonrotation of drillpipe. Inadequate drill-cuttings removal can cause costly problems such as excessive drag, and even mechanical pipe sticking. Therefore, many laboratory studies as well as field observations have been directed toward addressing the cuttings-transport problem. In the present study, a full-scale horizontal-cuttings-transport flow loop was set up and a total of 136 experiments were conducted. By analyzing the cuttings volumetric concentration and the dimensionless height of the cuttings bed, the effects of flow rate (0.00058–0.00078 m3/s), cuttings diameter (0.0003–0.005 m), rate of penetration (ROP) (0.00211–0.00636 m/s), eccentricity (0–0.8), and wellbore diameter (0.04–0.08 m) on wellbore-cleaning efficiency were obtained. It was found that cuttings-transport efficiency increased first and then decreased as cuttings diameter increased. Flow rate was the main parameter. Higher flow rate, lower ROP, lower eccentricity, and smaller drillpipe/wellbore-diameter ratio all led to higher wellbore-cleaning efficiency in microhole horizontal wells. In addition, a model for estimating the cuttings volumetric concentration and the cuttings-bed height was proposed by dimensional analysis dependent on the thorough understanding of the effects of various variables. The predictions were good when they were compared with the experimental data obtained. Major factors influencing cuttings transport in the field during microhole drilling and conventional rotary drilling were compared, and the reasons for their differences were discussed. The limitations of the proposed model in this study were also discussed. These results could provide a factual basis for improving microhole-drilling hydraulics.

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