Method of Determining Reasonable Gas Production Rate of Water-Contained Gas Reservoir Based on Water Invasion Velocity
A speed and water intrusion technology, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve the problems of inability to characterize the dynamic characteristics of formation water, lack of other problems, and achieve wide application prospects, great economic benefits, and simple methods Effect
Active Publication Date: 2022-01-25
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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Problems solved by technology
As we all know, the volume coefficient of water intrusion is a static characteristic parameter of formation water, and cannot characterize the dynamic characteristics of formation water propulsion; therefore, it is more reasonable to determine the reasonable gas production rate by studying the dynamic parameters of water intrusion—the relationship between water intrusion speed and gas production rate. However, the existing methods lack research in this area and have technical deficiencies.
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[0034] The invention discloses a method for determining a reasonable gas production rate of a water gas reservoir based on a water invasion rate, comprising the following steps:
[0035] Step 1: Calculate the water intrusion index
[0036] The water invasion index is calculated according to the current apparent formation pressure, the original apparent formation pressure, the current cumulative gas production and the geological reserves of the gas reservoir with water. Among them, the current apparent formation pressure, the original apparent formation pressure, the current cumulative gas production and the geological reserves of gas reservoirs with water and gas reservoirs can be obtained by querying or calculating the existing known production data. Specifically, the water invasion index is calculated by the following formula inferred:
[0037]
[0038] In formula (1), B represents the water invasion index, 1.0i Indicates the original formation pressure obtained from sta...
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The invention discloses a method for determining a reasonable gas production rate of a gas reservoir with water based on the velocity of water intrusion, comprising the following steps: Step 1: calculating the water intrusion index, according to the current apparent formation pressure, the original apparent formation pressure of the gas reservoir with water, Calculate the water influx index based on the current cumulative gas production and geological reserves of gas reservoirs; Step 2: Calculate the water influx velocity, calculate the net water influx under the mining life of the water-bearing gas reservoir based on the production data, and then calculate the water influx velocity based on the net water influx ; Step 3: Calculate the critical gas production rate for rapid water breakthrough in the gas reservoir according to the water invasion rate and the water invasion index. Step 4: Determine the reasonable gas production rate, and determine the reasonable gas production rate of water-bearing gas reservoirs in combination with the number of production wells and gas well productivity. The invention can determine the critical value of the gas production rate corresponding to the rapid water breakthrough in the gas-producing reservoir, and finally determine a reasonable gas production rate less than the critical value based on the number of production wells and gas well productivity, so as to ensure that the water invasion of the gas reservoir with water is stable and controllable. achieve maximum economic benefit.
Description
technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a method for determining a reasonable gas production rate of a water gas reservoir based on a water invasion rate. Background technique [0002] During the development of water-bearing gas reservoirs, edge and bottom water gradually invades to the bottom of the well with the formation of the bottom well pressure drop funnel, thereby reducing the gas saturation and gas phase permeability of the gas layer. When the water cone enters the wellbore, it will increase the Energy consumption reduces gas production and gas liquid-carrying capacity, eventually leading to water flooding of gas wells and shutting down production, affecting the ultimate recovery of gas reservoirs. Reasonable gas production rate is an effective means to control formation water intrusion. It can slow down the advancing speed of water body and reduce the damage of wate...
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IPC IPC(8): E21B49/00E21B47/06E21B47/07E21B47/00
CPCE21B49/00E21B47/06E21B47/00
Inventor 张文彪范竞仁刘荣和张李李洪玺高仪君罗勇
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD