CN-121998443-A - Comprehensive evaluation method for energy efficiency of dense hypotonic gas field development gathering and transportation pipe network system

CN121998443ACN 121998443 ACN121998443 ACN 121998443ACN-121998443-A

Abstract

The invention discloses an energy efficiency comprehensive evaluation method of a dense hypotonic gas field development gathering and transportation pipe network system, which comprises the specific steps of S100, constructing an energy efficiency evaluation index system, selecting evaluation indexes, S200, determining subjective weights by adopting an analytic hierarchy process (AHP for short), S300, determining objective weights by adopting an entropy weight method, S400, carrying out dimensionless treatment on evaluation index values by adopting a fuzzy membership function method, S500, multiplying the quantized values of the evaluation indexes by weight coefficients of all indexes by adopting a linear weighting method to obtain the evaluation values of all indexes, and adding the evaluation values to obtain a final total evaluation value. The invention carries out systematic and comprehensive deep analysis on the gas field gathering and transportation process, divides the whole system into a plurality of subsystems according to the gas field process, considers the influence condition of underground shafts and gas reservoirs on the ground gathering and transportation system, carries out classified calculation on the gas reservoirs, the shafts and the gathering and transportation pipeline network systems, and has higher energy efficiency level reliability of the gas field gathering and transportation system calculated by the method.

Inventors

JI YONGQIANG
FAN JINZHENG
PENG JIE
TIAN YONGGANG
QI HONGWEI
WANG MINGJUN

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司华北油气分公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (8)

1. The comprehensive evaluation method for the energy efficiency of the dense hypotonic gas field development gathering and transportation pipe network system is characterized by comprising the following specific steps of: s100, constructing an energy efficiency evaluation index system, and selecting an evaluation index; S200, determining subjective weight by adopting an analytic hierarchy process (AHP for short); s300, determining objective weights by adopting an entropy weight method; S400, carrying out dimensionless treatment on the evaluation index value by adopting a fuzzy membership function method; S500, multiplying the quantized value of the evaluation index by the weight coefficient of each index by adopting a linear weighting method to obtain the evaluation value of each index, and adding the evaluation values to obtain the final total evaluation value.
2. The comprehensive evaluation method for the energy efficiency of the dense hypotonic gas field development gathering and transportation pipe network system according to claim 1 is characterized in that in the step S100, an energy efficiency evaluation index system is constructed, evaluation indexes are selected, and the comprehensive evaluation indexes of the energy efficiency of the natural gas development gathering and transportation pipe network system are evaluated from two dimensions of technology and economy, so that 10 technical indexes and 4 economic indexes are formed, and the evaluation index system is shown in table 1. TABLE 1 comprehensive evaluation index system for energy efficiency of natural gas development gathering and transportation pipeline network system
3. The comprehensive evaluation method of energy efficiency of a dense hypotonic gas field development gathering and transportation pipe network system according to claim 1 is characterized in that in the step S200, questionnaires are issued to oil gas gathering and transportation technical experts to determine the influence degree of different indexes on the development gathering and transportation pipe network system, expert scoring is carried out according to a hierarchical structure and a constructed judgment matrix, scoring is carried out on each index according to a scale of 1-9, and the judgment matrix is as follows: Where a ij (i, j=1, 2, 3..n) is the importance of index i relative to index j, then a ji is the importance of index j relative to i, and a ij ＝1/a ji ,a ij >0,a ii =1; each index was scored by expert scoring according to the scale of "1-9" in table 2. Table 2 scale of 1 to 9 and meaning thereof
4. The comprehensive evaluation method for the energy efficiency of the dense hypotonic gas field development gathering and transportation pipe network system according to claim 1, wherein in the step S200, the index weight is determined as follows: For a pair of Normalization processing is carried out, and the normalization result is the weight of each index Checking the credibility of the result; Firstly, solving the maximum characteristic value: the CI is then evaluated: and then obtaining a value corresponding to the RI through table lookup, and solving a consistency ratio: If CR is less than 0.1, indicating that the results obtained using the AHP method are authentic, then a readjustment may be required.
5. The method for comprehensively evaluating the energy efficiency of a dense hypo-osmotic gas field development gathering and transportation pipe network system according to claim 1, wherein in the step S300, a membership matrix is established, each evaluation index is divided into m evaluation intervals, a grade limit value a j , j=1, 2, and m corresponding to the evaluation interval of each evaluation index is set, and membership of the evaluation interval of each evaluation index relative to the evaluation set is calculated to obtain membership Membership of formed matrix The matrix is formed as follows: Order the Then carrying out normalization treatment to obtain t ij ; Forward index: negative index: R' ij or r " ij is the value of the j-th evaluation interval of the i-th influencing factor (i=1, 2,.; j=1, 2, m), normalized data are recorded as t ij
6. The method for comprehensively evaluating the energy efficiency of a dense hypotonic gas field development gathering and transportation pipe network system according to claim 5, wherein in the step S300, the specific gravity of the ith influence factor t ij in the jth evaluation interval to the evaluation interval and the entropy of the jth evaluation interval are calculated, the weight of each evaluation index is further calculated, and then each evaluation index weight is obtained, and the specific calculation is as follows: t ij is the specific gravity of the evaluation section Entropy value of j-th evaluation interval: calculating the information entropy redundancy d j ＝1-e j , and then calculating the weight of each index And calculating to obtain a weight, and determining the sum of the weights in the formula of W= (W 1 ,w 2 ,…,w n ) to be 1.
7. The comprehensive evaluation method for the energy efficiency of the dense hypotonic gas field development gathering and transportation pipe network system according to claim 1 is characterized in that in the step S400, the evaluation indexes are subjected to dimensionless treatment by adopting a fuzzy membership function method; calculating a forward index by adopting a lifting ridge distribution fuzzy membership function: the reverse index is calculated by adopting a falling-ridge-shaped distribution fuzzy membership function: The evaluation index value x i is substituted into the fuzzy membership function to calculate, the membership value F (x i ) of the index can be obtained, the influence of the dimension is removed, and the standardized value F (x i )＝f(x i ) x 100 of the index is obtained.
8. The method for comprehensively evaluating the energy efficiency of a dense hyposmosis gas field development gathering and transportation pipe network system according to claim 1, wherein in the step S500, a linear weighting method is adopted to multiply the quantized value of the evaluation index by the weight coefficient of each index to obtain the evaluation value of each index, and then the evaluation values are added to obtain the final total evaluation value; calculating a criterion layer index evaluation value: Wherein U i is the evaluation value of the index of the ith criterion layer, U ij is the evaluation value of the index of the jth index layer in the index of the ith criterion layer, and omega ij is the weight of the index of the jth index layer in the index of the ith criterion layer; Calculating target layer index evaluation values: wherein U is the comprehensive evaluation value of the target layer index, U i is the evaluation value of the ith criterion layer in the target layer index, and omega i is the weight of the ith criterion layer in the target layer index.

Description

Comprehensive evaluation method for energy efficiency of dense hypotonic gas field development gathering and transportation pipe network system Technical Field The invention relates to the technical field of oil and gas gathering and transportation, in particular to a comprehensive evaluation method for energy efficiency of a gathering and transportation pipe network system developed by a compact hypotonic gas field. Background The development of the gas field needs to establish a corresponding ground gathering and transportation pipe network system so as to realize the collection, the treatment and the transportation of the natural gas. In the production operation of gas fields, there is a relationship of interaction and restriction among gas reservoirs, wellbores and a centralized transmission pipeline system. The design and adjustment of ground gathering and transportation supporting facilities can be influenced by the change of the development scheme, and the stable operation of the gas field can be hindered by the unreasonable ground gathering and transportation pipeline network system process, so that the stable production capacity and recovery ratio of the gas field are influenced. Therefore, the construction and development of an energy efficiency evaluation index system of a gathering and transportation pipeline network system are urgently needed. For example, chinese patent application CN105046040a discloses an energy efficiency evaluation method for a condensate gas field gathering and transporting process system, wherein, based on black box model statistics of each link of material flow, the energy efficiency evaluation calculation of the ground process system and each local process system is performed based on the first law of thermodynamics, the energy efficiency in the method is the energy utilization efficiency, the starting point of the natural gas production system mentioned in the index is the wellhead, while the invention provides the energy saving optimization direction of the system from four aspects of capability, energy consumption, efficiency and benefit, and the starting point of the constructed energy efficiency index system is the gas reservoir. The patent provides an energy efficiency evaluation method of a condensate gas field gathering and transportation process system, but the existing energy efficiency method is low in applicability and cannot evaluate energy efficiency under various different conditions, and in practice, a Delphi method is adopted to construct an energy efficiency evaluation index system of the gas storage ground process system in the research of the energy efficiency evaluation method of the gas storage ground process system, so that a set of energy efficiency evaluation method of the gas storage ground process system based on the combination of a analytic hierarchy process and a fuzzy function method is provided. The constructed energy efficiency evaluation index system mainly comprises the energy efficiency of a ground dehydration system and the energy efficiency of a ground pressurization system, underground indexes closely related to a ground process are not involved, an energy efficiency evaluation index weight coefficient is determined by adopting a analytic hierarchy process, and a calculation result is greatly influenced by subjective factors. Disclosure of Invention The invention provides a comprehensive evaluation method for energy efficiency of a dense low-permeability gas field development gathering and transportation pipe network system. The method not only can help gas field management personnel to master the comprehensive energy efficiency condition of the gas field gathering and transporting system in each stage, but also can discover the comprehensive energy efficiency factors influencing the production system according to the evaluation result, and provides technical support for improving the energy efficiency, saving energy, reducing consumption, improving the transformation of the gas field and the like. The invention is realized in the following way: a comprehensive evaluation method for energy efficiency of a dense hypotonic gas field development gathering and transportation pipe network system comprises the following specific steps: s100, constructing an energy efficiency evaluation index system, and selecting an evaluation index; S200, determining subjective weight by adopting an analytic hierarchy process (AHP for short); s300, determining objective weights by adopting an entropy weight method; S400, carrying out dimensionless treatment on the evaluation index value by adopting a fuzzy membership function method; S500, multiplying the quantized value of the evaluation index by the weight coefficient of each index by adopting a linear weighting method to obtain the evaluation value of each index, and adding the evaluation values to obtain the final total evaluation value. Preferably, in the step S100, an energy efficiency evaluation