2. Outline:
Introduction / Background
Related Work/Literature Review
Motivations and contributions
Aims And Objectives
Problem Statement
Limitations
Methodology/Model/ Approach
Analysis And Discussion
Timeline
Conclusion
Acknowledgments
References
Faculty of Computer and Information Technology
Sana'a University
3. Aims and Objectives
Aim
Reducing the possibility of occurrence of gas kick during horizontal well drilling.
Objective
Redesign mud program
Redesign well construction
Prevent gas kick in horizontal wells by well control development.
Faculty of Computer and Information Technology
Sana'a University
4. Problem Statement
The problem is that the well is not filled with adequate drilling fluid and that there are
unexpected high-pressure seams that overcome the column pressure of the drilling
fluid.
Also, the drilling engineer not monitoring the pipelines withdrawal tank through which
the well is filled, as well as the drilling fluid leaving the well during the pulling process,
Failure of the operating company to follow the service company’s recommendations in
examining rock samples (cuttings) emerging from the well
Also the occurrence of swabbing due to withdrawing the pipe
Faculty of Computer and Information Technology
Sana'a University
5. Significant Of The Research
The importance of the study is that it will focus on the solutions that must be
followed to reduce the problem of gas surges in horizontal wells, which caused
large losses of sums to control this problem, as its cost amounted to an amount
exceeding (70,000.00) US dollars.
In addition to the environmental damage that can lead to landslides due to gas
surges
Faculty of Computer and Information Technology
Sana'a University
6. Research Question
How to prevent the kick due to gas in horizontal well
problem from happening?
Faculty of Computer and Information Technology
Sana'a University
7. Methodology
This Part contains three main parts which are:
Type Of Data
Analysis Approach
Expected Results
Faculty of Computer and Information Technology
Sana'a University
8. Methodology
Type of Data:
Mud Report
Geological Report
Well Construction Design
Type of data that will be used in the research
Faculty of Computer and Information Technology
Sana'a University
9. Methodology
Analysis Approach
Qualitative and Quantitative
Analytical and
Descriptive
Analysis approach that will be used.
Faculty of Computer and Information Technology
Sana'a University
10. Methodology
Expected Results
Find out the main cause for gas kick while horizontal well
drilling and find the best solution for preventing this
problem from happening.
The expected results for this study is:
Faculty of Computer and Information Technology
Sana'a University
11. ANALYSIS AND DESCCUSION
Mud Failure
Failure to fill the well with the appropriate drilling fluid mud during the pipelining
process, despite their knowledge of entering a gas layer and the possibility of rapidly
raising the pipes, which led to the process of (swabbing), and this helped in the gas
escape
Schlumberger's explanation indicates that this well is a gas well and therefore it was
necessary to raise the drilling fluid mud instead of continuing drilling with a liquid with
a weight of (9.2 ppg) and thus it was possible to overcome the gas kick from the well.
Faculty of Computer and Information Technology
Sana'a University
12. ANALYSIS AND DESCCUSION
Mud Failure
The presence of unexpected high pressure layers that overcome the column pressure
of the drilling fluid.
The failure of the service company to monitor the gas monitoring device on the (Shale
checker), which in turn when the drilling fluid (flow line) leaving the well comes out
means the first exit of the drilling fluid from the well that reaches this device, which is
the one that reads the gas ratio. Because there is a screen and a controller in which
everything is written, and it is present at more than one person in the field.
Faculty of Computer and Information Technology
Sana'a University
13. ANALYSIS AND DESCCUSION
Casing Pipe Failure
The casing pipe, with a diameter of 9 5/8 inch, was lowered at the depth of (969),
while drilling was carried out to the final depth of (3642) feet, which means that
(2673) feet was left without lining an open hole.
The viscosity of the drilling fluid used was high (51) and more suitable (46 - 45),
which is the preferred viscosity.
Faculty of Computer and Information Technology
Sana'a University
14. ANALYSIS AND DESCCUSION
Other Failure
When the pipes were loosened for the purpose of closing the well and abandoning
them, and during the pipelining process, the well was not filled with the appropriate
drilling fluid, and the hydrostatic pressure decreased significantly from the class
pressure represented by the gas pressure, which reached about 1300 psi, which led
to the gas rushing to the surface in the form of a fountain and the eruption
continued Six hours later, after a 10-minute pause the Kelly was installed and the
explosion detector switched off.
Faculty of Computer and Information Technology
Sana'a University
15. Conclusion
Drilling started in Raydan Brass Well, a diameter of 17.50 inches was drilled to
the depth of 114 feet, and the liner pipes with a diameter of 13.375 inches were
lowered to the depth of 114 feet and named after that, the drilling process
continued for the second stage with a drill head of 12.50 inches in diameter to
the depth of 969, and the liner pipes with a diameter of 9.625 inches were
lowered to the depth 969 ft.
Faculty of Computer and Information Technology
Sana'a University
16. Conclusion
The process was named and after the cement hardening process, drilling was
continued with a drill head of diameter 8.50 by using an oil drilling fluid after
changing its density from 8.6 to 9.2 together knowing that the rest of the drilling
fluid specifications are as follows:
Mud Wight = 9.2 ppg
FC= 2/32
YP = 13
GS = 12/20
FV = 51
Faculty of Computer and Information Technology
Sana'a University
17. Conclusion
At the depth of 1400, the construction of the inclination angle was
started at the top of the Safer salt layer at a depth of 1028 feet, and
the drilling process continued to the depth of 3642. At this depth, the
pipelines were pulled, and then the gas eruption problem began.
Faculty of Computer and Information Technology
Sana'a University
18. Recommendation
1) Good control of drilling fluid during the drilling process and dropping the
appropriate liquid at the concerned layer, be it gas or oil, or during the process
of pulling the pipes. The drilling engineer talks together Derrick mane by
mixing materials for the lifting process and during the lifting process a cut of
the well wall takes place and there are layers with poor gas or water bearing,
the pressure of the layer overcomes the pressure of the mud column
Faculty of Computer and Information Technology
Sana'a University
19. Recommendation
2) Redesigning the construction of the well and lowering the lining at the specified
depth instead of drilling the open hole
3) The presence of all necessary equipment to address in the event of such
problems and also provide qualified personnel that work to solve these problems if
they occur.
Faculty of Computer and Information Technology
Sana'a University
20. Recommendation
4) Supervising the Driller for a tank to withdraw and drop the pipes through which the
ground is filled with drilling fluid
5) Supervising service companies that learn to examine the rock samples coming out of the
well
6) Development of the control unit and the special device for the gas monitor, which is
installed on top of the shaker, which in turn works as a control for the drilling fluid.
Faculty of Computer and Information Technology
Sana'a University
21. Limitations
The lack of a detailed drilling fluid report
Absence of Well Construction diagram
Short of time.
Faculty of Computer and Information Technology
Sana'a University
22. The End
Any Questions ??
Faculty of Computer and Information Technology
Sana'a University
