Research of Security Analysis Technology based on Exploratory Well
Engineering of Oil Gas
Jianfang Jiang, Na ZHU, Jinzhou Yang, Jingyi Lian and Chaofei Wang
Research Institute of Enhanced Oil Recovery,China University of Petroleum (Beijing), Beijing, China
Keywords: Security, Oil gas exploring, Evaluation.
Abstract: Aims at the security problems on well engineering of oil gas, this article will evaluate the security analysis
technology. At first, the writer describes the process of drilling engineering and evaluates the relative risk
factors at each phase. In the second place, we can find the security evaluation of this well engineering and
provides the system principle of security evaluation. At last, this article analyzes the level standard that
based on the analysis system model of drilling security. This paper supports positive function to the drilling
engineering workers and security evaluators.
1 INTRODUCTION
The present society is increasing the dependency
degree of oil and gas. Oil and gas has significant
connections with the national economy development
and living improvement. It is nothing to treat oil gas
as the “National lifeline”. Oil and gas Is the
important strategic resources of China. However, the
low prospecting degree and special condition of the
working environment causes the continuous accident
and seriously limited the oil gas development.
2 DRILLING ENGINEERING
Drilling is the system engineering with multiple
operations, occupation, continuous operation, and
the vertical crossing works. It has the characteristics
of high input, high risk and high technology
requirement. Security hazard happens everywhere
during the drilling process. The once accident might
cause maximum loss on engineering schedule and
funds, even the casualties.
2.1 Drilling Process
Drilling is the necessary part of oil gas exploitation.
Follow the drilling engineering we can sequence the
works: prespud operation, drilling engineering and
the completions engineer. Each phase needs to have
the specific works.
2.1.1 Prespud Preparation
Prespud preparation is the first process of the whole
engineering. Confirm the well position, and then we
can start the prespud preparation. It includes: well
position exploration and land expropriation, bridge
and road engineering, well site earthwork,
equipment removes and installation and so on.
2.1.2 Drilling Engineering
It divides into first drilling, second drilling and the
third drilling. During the drilling process, it needs a
drill stem-testing cooperation, electrical logging
cooperation, sidewall coring electrical logging of
finish drilling and drilling coring. Otherwise, drilling
engineering requires pipe service, drilling fluid
service, material supply service and drilling service
of exceptional well to protect engineering success.
2.1.3 Completions Engineer
Completions engineer needs to do running casing,
well cementation, and well cross in order to protect
oil gas exploitation.
2.2 Risk Evaluation of Drilling
Engineering
Drilling engineering is the complicate project. It
includes multiple uncertain factors. The relative
111
Yang J., Wang C., CHENG X., Lian J. and ZHU N.
Research of Security Analysis Technology based on Exploratory Well Engineering of Oil Gas.
DOI: 10.5220/0006020001110114
In Proceedings of the Information Science and Management Engineering III (ISME 2015), pages 111-114
ISBN: 978-989-758-163-2
Copyright
c
 2015 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved
111

enterprises, management departments need to
forecast the accident possibility, evaluate the risk
degree, find out the accident rules, reasons, and
adopt the remedial measure.
2.2.1 Dangerous Substance
Oil and gas are the flammable and combustible
materials. Gas has a higher specific gravity than air.
It can spread to lower places and burn once touched
the open fire. Otherwise, some crude oil has
sulfureted hydrogen, which has toxic. If you intake it
in short time, you will shed tears, photophobia,
cough, and confusion. The serious condition has
coma, edema, even death.
Otherwise, the raw material of drilling
engineering is the flammable and combustible
materials as well as mountain flour, grease and so
on. The drilling process will create effluent, dust,
and noise. We need to do the unity collection and
management by the professional workers.
2.2.2 Risk Factors of Drilling Engineering
Drilling engineering is full of risks. We need to
focus on the security questions. The drilling risks
have: object striker, high-altitude falling, fire, well
slough, thunder, and poisoning. The well
cementation risks have: electric shock, chemistry
corrosion, poisoning, casing failure, high pressure
damage, and tool damage.
2.2.3 Environmental Factors
Drilling engineering has various difficulties. We
need to consider the external environment factors
while avoid human error. For example:
meteorological condition, earthquake, and road
question.
3 RISK EVALUATION OF OIL
GAS EXPLORATION
3.1 Risk Evaluation Content.
3.1.1 Drilling Design Evaluation.
Drilling design includes geology, engineering and
construction. Geology design needs to collect
pressure factors, oil gas location, and geological
factor. Drilling engineering design includes
standard, regulation, well structure, feasibility and
the rationality analysis of well cementation and well
completion. Drilling construction needs to follow the
design of geology and engineering to analyze the
construction rationality and the risk of uncertainty
factors.
3.1.2 Construction Environment Assessment
We need to inspect the geology, weather, and
hydrology. Moreover, evaluate the effect proportion
and the maximum protection of people and property
security when facing the emergency.
3.1.3 Construction Site
From the site test, we can evaluate the security
degree of people and equipment, and then formulate
rules and safety regulations to protect the correct
operation. During the construction process, we can
abstract the relative parameters, obtain the materials,
evaluate the practical condition and avoid the risk.
3.1.4 Emergency Capacity Evaluation
We can reference the engineering experiences and
evaluate the site investigation in order to design the
emergency plan and train the workers.
3.2 Risk Evaluation Principles of
Drilling Engineering
3.2.1 Systematicness
The whole security system includes people,
equipment, and environment. The relative functions
build the whole system with the inseparable details.
3.2.2 Pertinence Principle
Drilling engineering is complicated. We need to
evaluate the engineering based on the practical
condition in order to depend on the experiences and
principles. Different engineering has the various
security indexes. The details are different with
similar keys.
3.2.3 Simple Scientificity
Risk evaluation supports service to the engineers.
The evaluation index should be simple and clear that
can reflect the detailed engineering condition.
3.2.4 Stabilization Comparability
Drilling process steps should be quantized. We can
adjust the operation error.
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Figure 1: Model of security evaluation system.
3.2.5 Indexity
Use detailed value to analyze the security degree
will raise the staff attention from each number
changing and reflect the safety condition.
3.3 Index Evaluation System
The evaluation system combines with index system,
scoring system, risk ranking standard and specialists.
The security risks of different phases of the index
system. The advantage of perceptual intuition
requires more consideration. Scoring system
provides reasonable values to each index. The
advantage of its abundant information content has
the disadvantage of stronger subjectivity. Risk level
depends on the risk standard and the probable hazard
rating. The specialists include relative technician and
the experts from other fields to help the data
analysis.
4 ESTABLISHMENT OF
SECURITY EVALUATION
SYSTEM
4.1 Model of Security Evaluation
System
The model of the security evaluation system
combines with inherent risk index, serious
consequence index and probable accident index.
Figure 1 is the basic model.
(1) Inherent risk index: all the drilling
engineering has this unmodifiable risk. For example:
the environment and geology of this engineering
(2) Probable accident index: drilling engineering
is complicated. The accident did not happen
individually. It might be caused by one small
accident, then give rise to the serious accident. We
can use the formula (1) to describe the accident
ponderance.
Research of Security Analysis Technology based on Exploratory Well Engineering of Oil Gas
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R P*S (G+Y)*S (1)
R is the relative risk assessed value, P is the sum
of the inherent risk index (G) and the Probable
accident index (Y), and S means the serious
consequence index.
(3) Probable accident index: during the
engineering operation, the probable accident is
changeable that we can avoid the accidents through
regulation and security operation.
4.2 Risk Ranking Standard
Based on the practical condition and evaluation
system of the drilling engineering, this article
divides the risk into four levels through the security
question research of the oil gas drilling engineering.
The details are in table 1.
Table 1: Risk ranking standard.
Level Value-at-risk Description
1 Less than 100 Los risk
2 100--200 Medium risk
3 200--350 Superior risk
4 350--500 High risk
5 More than 500 Extreme risk
5 CONCLUSION
This article starts the research based on the security
analysis of oil gas drilling. The oil gas exploiting has
the direct bearing on the national economy and the
people’s livelihood. At the same, the exploratory
well engineering of oil gas is complicated with high
risk. It will cause as minor cost as the waste of
funds, equipment and time. Moreover, it might to
cause the casualty, which requires relative people
pay high attention to it. For the length limitation, this
article did not support the related index of security
evaluation system. Hope the interested readers will
perfect this article based on the local requirement.
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