Effectiveness of gas inflow stimulation works at the final stage of field development

3. METHODS 
 
The performed analysis of the existing scientific research in the sphere of the effectiveness of any type of 
work allows us to summarize and group them into the following blocks (Figure 1). 

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*created by the authors 
Figure 1. Approaches to performance assessment* 
First block: assessment of the degree of attainment of the established target indicator values in the sphere 
of drilling operations and stimulating the inflow of hydrocarbon raw materials. 
Second block: assessment of the effectiveness of the constituent components, which requires identification 
of the processes included in drilling operations considering the stimulation of hydrocarbon inflow (including 
their weight). 
Third block: performed based on performance assessment of the identified objects that perform drilling 
operations. 
Fourth block: performed based on the analysis of work of all structural divisions of the enterprise that 
perform drilling services by the following elements: 
- attainment of the goals of drilling operations considering the stimulation of hydrocarbon raw materials 
inflow; 
- compliance with the standards for drilling operations; 
- effectiveness of the processes of drilling operations; 
- satisfaction of the customer of drilling operations, taking into account the uniform weighting coefficients. 
Fifth block: determined based on the analysis of drilling operations in particular directions, for example 
considering the stimulation of hydrocarbon inflow followed by additive convolution of the obtained data. 
Sixth block: assessment of the effectiveness of drilling works may be conducted based on the results of the 
internal audit. This assumes the acquisition of the following assessments: 
- compliance of operations with the requirements of the normative documentation on drilling operations; 
- the processes of drilling and inflow stimulation; 
- the divisions performing drilling works; 
Work performance assessment approaches 
Assessment of the degree 
of attainment of the 
established target indicator 
values 
Assessment of the 
efficiency of the 
constituent processes 
Assessment of the 
functioning of selected 
objects, including processes 
of different nature 
Based on the results of 
internal audit 
Analysis and 
assessment of works 
by specific areas 
Analysis of the work of the 
company's divisions 

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- the work of the drilling organization in relation to the number and significance of detected inconsistencies. 
According to the presented method, the performed drilling works may be considered effective with scores 
ranging from 0.7 to 1.0 (with the overall range of possible scores from 0 to 1.0). 
The above shows that there is a wide range of approaches to performance assessment, which demonstrates 
a recognition of its importance for the successful operation of the drilling organization and the identification 
of its future development prospects. 
At present, there is no single universally recognized method for assessing the effectiveness of works 
developed based on international standards. 
The performance evaluation algorithm for inflow stimulation works is based on the implementation of the 
“Continuous Improvement” principle. 
At the first stage of the algorithm, assessment criteria are determined based on the requirements of the 
system standards, and their target values are established. 
At the second stage, indicators for each parameter are identified. Ratios between the planned and actual 
values are calculated for each criterion to be used to determine the effectiveness of stimulation works’ 
performance. 
The third stage involves the identification of target values for each criterion. 
At the fourth stage, the importance of indicators is determined using T. Saati’s hierarchy analysis method. 
At the fifth stage, the effectiveness of work is calculated using the formula (1): 
𝐸
𝑄𝑀𝑆
= ∑ 𝐸
𝑝𝑟𝑖
𝑛
𝑗=1
× 𝑚
𝑗
(1)
where E
prj
– effectiveness of the j-th process; 
m
j
– weight coefficient of the j-th process; 
j – the number of processes. 
At the sixth stage, after the effectiveness is determined, it is evaluated by the Harrington Desirability Scale 
with respect to the following conditions provided in Table 1. 
Table 1. Scale of criterion property intensity* 
Name of gradation Numeric 
intervals 
Actions with respect to the system 
Very high 
1.0-0.8 
The works are performed effectively, but preventive measures need 
to be developed; if P = 100%, then the system does not require the 
development of any measures. 
High 
0.8-0.63 
The works are performed effectively, but minor preventive 
measures need to be developed. 

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Medium 
0.63-0.37 
The works are performed effectively, but preventive measures need 
to be developed. 
Low 
0.37-0.2 
The works are performed ineffectively, major preventive measures 
need to be developed. 
Very low 
0.2-0.0 
The works are performed ineffectively and require senior 
management intervention if P = 0%. 
*created by the authors 
At the seventh stage, decisions are made on the further conduct of flow stimulation works. Once the level 
of effectiveness is determined according to the desirability scale, based on the derived conclusions, a 
management representative together with the process owners proceeds to develop corrective and/or 
preventive actions and measures to improve the processes with further control and analysis of their 
execution. 
Thus, the information obtained about the effectiveness of gas inflow stimulation works serves as a basis for 
analysis of the system by executives and is used for prompt process control, revision of documents and 
procedures, periodic reconsideration of policies and objectives, and analysis and improvement