An identification method for a gas reservoir water invasion dominant channel

A dominant channel and identification method technology, applied in the field of research on the law of gas reservoir edge water intrusion, can solve the problems of low identification accuracy and strong subjective factors, achieve high identification accuracy, good matching degree, and prolong the effect of stable production period

Pending Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an identification method for the dominant channel of water invasion in gas reservoirs, so as to solve the problems of strong subjective factors and low identification accuracy existing in existing identification methods

Method used

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  • An identification method for a gas reservoir water invasion dominant channel
  • An identification method for a gas reservoir water invasion dominant channel
  • An identification method for a gas reservoir water invasion dominant channel

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Embodiment

[0048] The method for identifying the dominant channels of water invasion in gas reservoirs in this embodiment is aimed at the gas fields with massive reef-shoal facies in carbonate rocks with edge and bottom water. The flow chart is as follows figure 1 shown, including the following steps:

[0049] 1) The factors affecting water intrusion in the target block (including the average permeability of the water-producing layer, the average fracture density of the water-producing layer, the gas production intensity of the water-invasion layer and the gas production rate of the water-invasion layer) are advanced with the dynamic data of the gas-water front Velocity matching, evaluating the correlation between various factors and the propulsion velocity of the air-water front;

[0050] The fitting results of various factors and the propulsion velocity of the air-water front are as follows: Figure 2 to Figure 5 It can be seen from the figure that the correlation between fracture and...

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Abstract

The invention relates to an identification method for a gas reservoir water invasion dominant channel. The identification method comprises the following steps: 1) fitting an influence parameter of a water invasion dominant channel of a target block with a gas-water leading edge propulsion speed, and screening main parameters influencing the gas-water leading edge propulsion speed; 2) calculating aweight coefficient of each main parameter by using a grey correlation method, taking the main parameter screened in the step 1) as a sub-sequence and taking a gas-water leading edge propulsion speedas a mother sequence; 3) after normalization processing is carried out on all main factors, carrying out weighted average, and calculating dominant channel factors; And 4) optimizing the dominant channel factors on each grid in combination with a geological model to obtain a dominant channel body, and determining water invasion dominant channel distribution. According to the identification methodof the gas reservoir water invasion dominant channel, subjective factors in the process of comprehensively comparing a plurality of influence factor geological models in the past are avoided, the goodness of coincidence between the dominant channel factors and dynamic data of a water-breakthrough gas well is good, and the identification precision of water invasion dominant channel distribution ishigh.

Description

technical field [0001] The invention belongs to the research field of gas reservoir edge water intrusion laws, and in particular relates to a method for identifying dominant channels of gas reservoir water intrusion. Background technique [0002] Marine carbonate reservoirs are distributed in blocks as a whole, with various pore types and strong vertical and horizontal heterogeneity. The path is different from the distribution of clastic rock reservoirs along layers and along dominant facies belts. In carbonate gas reservoirs, it is very difficult to determine the key influencing parameters of water invasion and the dominant channel of water invasion, which makes it difficult to judge the next invasion direction and possible water wells after edge water invasion. Establishing a scientific and reasonable identification method for the dominant channel of water invasion in gas reservoirs plays an important role in recognizing the direction of water invasion in the next step of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 刘卉姜贻伟宿亚仙姜淑霞秦凌嵩张纪喜范凌霄万龙
Owner CHINA PETROLEUM & CHEM CORP
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