Rotary drilling of a horizontal well, West Java Sea

2018 ◽  
Author(s):  
P. Simorangkir
Keyword(s):  
Horizontal Well ◽  
West Java ◽  
Rotary Drilling ◽  
Java Sea

FISH DIVERSITY IN THE DOWNSTREAM REGION OF CIPANAS RIVER INDRAMAYU, WEST JAVA INDONESIA

Zoo Indonesia ◽  
2020 ◽  
Vol 29 (1) ◽  
Author(s):  
Titin Herawati ◽  
Gema Wahyudewantoro ◽  
Yuli Andriani ◽  
Heti Herawati ◽  
Naomi Masnida Yunisia Siregar
Keyword(s):  
Water Quality ◽  
Census Data ◽  
Fish Assemblages ◽  
Survey Methods ◽  
Upstream Region ◽  
Fish Diversity ◽  
West Java ◽  
Fish Collection ◽  
Java Sea ◽  
Downstream Area

Cipanas River is one river in West Java where its upstream region in Tampomas Mountain, Sumedang and it is emptied into the Java Sea, Indramayu. The study was aimed to investigate fish diversity in the downstream area of Cipanas River. The study was conducted by survey methods with census data collection techniques, taken place at 3 stations of Santing, Tempalong, and Cemara of Indramayu Regency. The parameters measured consisted water quality and fish assemblages. Water quality was measured referring to standard laboratory protocol, and fish collection was made by case net with different mesh sizes. The results showed that water quality conditions of the Cipanas River downstream was suitable for inhabiting fishes. There were as many as 548 individual fishes caught belonging to 21 species, 16 genera, and 14 families. Fish diversity was categorized as medium with 1.6 ≤ H ’≤ 2.2 indicating fairly good community structure, and the Evenness index was 0.81 ≤ E ≤ 0.86 to show highly evenly distributed.

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.

Environmental Effects Of Produced Formation Waters In The West Java Sea, Indonesia

1996 ◽  
Author(s):  
J.P. Smith ◽  
A.O. Tyler ◽  
M.C. Rymell ◽  
H. Amperanto ◽  
B. Ng ◽  
...  
Keyword(s):  
Environmental Effects ◽  
The West ◽  
West Java ◽  
Java Sea
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