CN109630102B - Method for measuring gas-containing area of each layer of multilayer low-permeability tight sandstone gas well - Google Patents
Method for measuring gas-containing area of each layer of multilayer low-permeability tight sandstone gas well Download PDFInfo
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Abstract
A method for measuring the gas-containing area of each layer of a multi-layer low-permeability tight sandstone gas well adopts a dynamic layering splitting method, and comprises the following steps: measuring the integral dynamic control reserve G of the gas well by adopting a pressure drop method, an unstable yield method or a flowing substance balancing method, and acquiring the integral dynamic control reserve G of the gas well under the condition of the combined layer mining; carrying out on-site production capacity test of each production zone, acquiring production capacity data of different production zones, namely daily gas production of the production zone with unit thickness, establishing a quantitative relation among the gas production capacities of the gas zones, and carrying out thickness standardization treatment; splitting each layer into each layer according to the proportion of the normalized thickness of each layer to the total standard thickness to dynamically control the reserves; and (3) dynamically controlling the reserves of each layer based on splitting, and measuring the gas-containing area of each layer by adopting a volumetric method in combination with the measured porosity, gas-containing saturation and gas layer thickness of each layer section. The invention measures the gas-containing area of each layer through layered splitting, thereby providing a basis for the efficient development of the gas field.
Description
Technical Field
The invention relates to the field of low-permeability and tight sandstone gas reservoir development, in particular to a method for measuring reserves and development utilization degree thereof by using gas well production test and gas reservoir geological parameters, and more particularly relates to a method for measuring the gas-containing area of each layer of a multi-layer low-permeability tight sandstone gas well.
Background
The hypotonic-compact sandstone gas is an important gas reservoir type in China, the reserve scale is huge, and the efficient development of the gas reservoir type has important significance for ensuring the stable supply of natural gas in China. The hypotonic-compact gas reservoir gas layer is lens-shaped and has the characteristics of small scale and vertical multi-layer section development. At present, the gas well mainly carries out the dynamic reserves measurement of the whole multilayer system, and has no means for respectively carrying out the dynamic reserves measurement on each layer section and also has no means for respectively carrying out the gas-containing area measurement on each layer section, so that the reserves and/or the gas-containing area conditions of each layer section cannot be accurately known, and the production activity cannot be effectively guided.
Therefore, in order to solve the defects and shortcomings of the prior art, a method for measuring the gas containing area of each layer of the multilayer low-permeability tight sandstone gas well needs to be researched.
Disclosure of Invention
The invention is made in view of at least one of the problems, and the invention designs and invents a dynamic layering splitting method on the basis of the measurement of the whole dynamic reserve of a multi-layer system of the low-permeability tight sandstone gas well, and measures the dynamic reserve and/or the gas leakage area of each layer section, thereby providing an effective basis for well pattern adjustment and the whole efficient development of a gas reservoir.
It should be noted that the gas well dynamic control reserves: the total amount of natural gas which can flow out of a gas reservoir when a gas well is put into production until the stratum pressure in the range of natural gas yield and spread is reduced to zero under the condition that the existing process technology and the existing well pattern mining mode are not changed in the geological reserves is developed.
Specifically, according to one aspect of the invention, the method for measuring the gas-containing area of each layer of the multilayer low-permeability tight sandstone gas well is characterized by adopting a dynamic layering splitting method, and comprises the following steps:
measuring the integral dynamic control reserves G of the gas well by adopting a pressure drop method, an unstable yield method or a flowing substance balancing method, and acquiring the integral dynamic control reserves G of the gas well under the combined layer mining condition;
carrying out on-site production capacity test of each production layer, acquiring production capacity data of different production layers, namely daily gas production of the production layers with unit thickness, establishing quantitative relation among the gas production capacities of the gas layers of the layer system, and carrying out thickness standardization treatment;
splitting each layer into each layer according to the proportion of the standardized thickness of each layer to the total standard thickness;
and dynamically controlling the reserves of each layer based on splitting, and measuring the gas-containing area of each layer by adopting a volumetric method in combination with the porosity, the gas saturation and the thickness of the gas layer of each layer section.
According to another aspect of the invention, the measured single layer dynamic control reserve G Mountain 2 Is equal to
Wherein H Box 8 ’、H Mountain 1 ’、H Mountain 2 ’、H Taiyuan ' standardized thicknesses of the layers are respectively, and G is the integral dynamic control reserve of the gas well.
According to another aspect of the invention, reserves are dynamically controlled based on the split layers, and the gas-containing area of each layer is determined by a volumetric method in combination with the porosity, gas saturation and gas thickness of each layer, wherein the gas-containing area is equivalent to the gas leakage area of each layer of the gas well.
According to another aspect of the invention, the reserve volume method is:
in the formula: g is the natural gas geological reserve, 10 8 m 3 (ii) a A is the gas-containing area, km 2 (ii) a h is the effective thickness of the gas layer, m; phi is gas layer porosity,%; sg is the gas saturation,%; psc is the ground standard pressure, MPa and K; tsc is ground standard temperature, 293.15K; pi is the original formation pressure of the gas reservoir, MPa; t is the average gas layer temperature K; zi is the original gas deviation coefficient.
According to another aspect of the invention, the measured gas well single layer gas bearing area or gas leakage area A Mountain 2 Comprises the following steps:
in the formula: h is a total of Mountain 2 Is the thickness of 2 segments of air layer in the mountain, phi Mountain 2 Porosity of 2 sections of mountain, sg Mountain 2 The 2 nd segment of the mountain contains gas saturation.
Compared with the prior art, the invention has the beneficial effects that:
the invention establishes the quantitative corresponding relation of the gas production capacities of different producing layers, carries out accurate thickness standardization processing, and finally measures the dynamic control reserves of each layer through layering splitting. Further, on the basis of measuring parameters such as porosity and gas saturation of the gas layer, a gas production capacity quantification relation is established according to the difference of yield capacities of different intervals of the gas well, thickness standardization processing is carried out, and finally the reserve and/or the gas leakage area of each layer is dynamically controlled through layered splitting measurement, so that a basis is provided for efficient development of the gas field.
Drawings
Fig. 1 is a schematic diagram for determining the gas production capacity of a multilayer system gas layer according to a preferred embodiment of the invention.
FIG. 2 is a schematic illustration of a gas well multi-zonal thickness normalization process in accordance with a preferred embodiment of the present invention.
Figure 3 is an exemplary dynamic controlled reserve and/or deflation area for each layer as determined in accordance with a preferred embodiment of the present invention.
Detailed Description
The best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings, wherein the detailed description is for the purpose of illustrating the invention in detail, and is not to be construed as limiting the invention, as various changes and modifications can be made therein without departing from the spirit and scope thereof, which are intended to be encompassed within the appended claims.
Example 1
Referring to the attached drawings 1-3, preferably, the invention provides a method for measuring the gas-containing area of each layer of a multi-layer low-permeability tight sandstone gas well, which is characterized in that the method adopts a dynamic layering splitting method and comprises the following steps:
measuring the integral dynamic control reserve G of the gas well by adopting a pressure drop method, an unstable yield method or a flowing substance balancing method, and acquiring the integral dynamic control reserve G of the gas well under the condition of the combined layer mining;
carrying out on-site production capacity test of each production layer, acquiring production capacity data of different production layers, namely daily gas production of the production layers with unit thickness, establishing quantitative relation among the gas production capacities of the gas layers of the layer system, and carrying out thickness standardization treatment;
splitting each layer into each layer according to the proportion of the normalized thickness of each layer to the total standard thickness to dynamically control the reserves;
and dynamically controlling the reserves of each layer based on splitting, and measuring the gas-containing area of each layer by adopting a volumetric method in combination with the porosity, the gas saturation and the thickness of the gas layer of each layer section.
Preferably, the measured single layer dynamic control reserve G Mountain 2 Is equal to
Wherein H Box 8 ’、H Mountain 1 ’、H Mountain 2 ’、H Taiyuan ' standardized thicknesses of the layers are respectively, and G is the integral dynamic control reserve of the gas well.
Preferably, reserves are dynamically controlled on the basis of split layers, and the gas-containing area of each layer is determined by a volumetric method by combining the porosity, the gas saturation and the gas layer thickness of each layer, wherein the gas-containing area is equivalent to the gas leakage area of each layer of a gas well.
Preferably, the reserve volume method is:
in the formula: g is the geological reserve of natural gas, 10 8 m 3 (ii) a A is the gas-containing area, km 2 (ii) a h is the effective thickness of the gas layer, m; phi is gas layer porosity,%; sg is the saturation degree of gas; psc is ground standard pressure, MPa and K; tsc is the ground standard temperature, K; pi is the original formation pressure of the gas reservoir, MPa; t is the average gas layer temperature K; zi is the original gas deviation coefficient. Preferably, the original gas deviation coefficient Zi can be determined through experimental tests, taking 4 gas production layer sections such as 8 sections of boxes, 1 section of mountains, 2 sections of mountains, a taiyuan group and the like of the Shenmu gas field production layer of the Ordos basin as an example, in the area, psc is the ground standard pressure, and MPa is taken as a value of 0.101MPa through determination; tsc is the ground standard temperature, the degree of Kelvin K, and the value is 293.15K; pi is the original formation pressure of the gas reservoir, mpa, and takes 29Mpa; t is the average gas layer temperature K, and the value is 380K; zi is the original gas deviation coefficient, has no dimension, and takes the value of 0.96. Preferably, the other parameters are obtained by logging, which varies from well to well.
Preferably, the measured gas well single layer deflation area A Mountain 2 Comprises the following steps:
in the formula: h is Mountain 2 Is the thickness of 2 segments of air layer in the mountain, phi Mountain 2 Porosity of 2 sections of mountain, sg Mountain 2 The 2 nd segment of the mountain contains gas saturation.
Preferably, on the basis of measuring parameters such as porosity and gas saturation of a gas layer, the invention establishes a gas production capacity quantitative relation according to the yield capacity difference of different intervals of the gas well, performs thickness standardization treatment, and finally measures the dynamic control reserve and/or gas leakage area of each layer through layering splitting, thereby providing a basis for efficient development of the gas field.
Example 2
Referring to fig. 1-3, preferably, the invention provides a method for measuring gas-containing area of each layer of a multilayer low-permeability tight sandstone gas well, which is characterized in that the method adopts a dynamic layered splitting method and comprises the following steps:
(1) Firstly, measuring the integral dynamic control reserves of the gas well multi-layer system by adopting conventional methods such as a pressure drop method, an unstable yield method, a flowing substance balancing method and the like, and obtaining the dynamic reserves of the integral gas well under the condition of the combined layer exploitation.
(2) And carrying out the production capacity test of each production layer on site, acquiring the production capacity data of different production layers, namely the daily gas production of the production layer of unit thickness, establishing the quantitative relation among the gas production capacities of the gas layers of the layer system, and carrying out thickness standardization treatment.
For example, the production zone of the jordan wood gas field in the deldos basin is 4 gas production zone sections such as 8 sections of the box, 1 section of the mountain, 2 sections of the mountain, the taiyuan group and the like, and field tests show that: the daily gas production of the gas layer of the unit thickness of the four layers is respectively 0.10 ten thousand square/day, 0.13 ten thousand square/day, 0.21 ten thousand square/day and 0.18 ten thousand square/day, and the production capacity of the mountain 2 section and the Taiyuan production layer is the strongest. Combining the daily gas production rate data of the gas layer with unit thickness, establishing a quantitative relation between the gas production capacities of the gas layers of the multiple strata (see figure 1), and carrying out thickness standardization treatment on the gas layers of different strata, wherein the thickness of the mountain 2 is taken as a standard thickness, namely: if the thickness of the produced gas of the section of the mountain 2 is 1m, the thickness of the section of the box 8, the section of the mountain 1 and the original 1m thick gas layer of the Taiyuan group are respectively 0.48m, 0.62m and 0.86m.
(3) And (3) performing thickness standardization treatment (see figure 2) according to the development condition of each gas layer of the gas well, and splitting the dynamic control reserves according to the proportion of each layer standardized thickness to the total standard thickness.
Taking S1 well as an example, the thicknesses of the gas layers of 8 sections of drilling box, 1 section of mountain, 2 sections of mountain and Taiyuan group are respectively H Box 8 、H Mountain 1 、H Mountain 2 、H Taiyuan Normalized thickness of H Box 8 ’、H Mountain 1 ’、H Mountain 2 ’、H Taiyuan ' if the gas well dynamic control reserves are G, then the mountain 2 sections dynamic control reserves are batchedMethod G Mountain 2 Comprises the following steps:
(4) And (3) based on the dynamic control reserves of the split parts of each layer, combining reservoir parameters such as porosity, gas saturation and gas layer thickness of each layer, and determining the gas-containing area by adopting a volumetric method, wherein the gas-containing area is equivalent to the gas leakage area of a gas well.
The reserve capacity measuring volume method comprises the following steps:
in the formula: g is the natural gas geological reserve, 10 8 m 3 (ii) a A is the gas-containing area, km 2 (ii) a h is the effective thickness of the gas layer, m; phi is gas layer porosity,%; sg is the saturation degree of gas; psc is ground standard pressure, MPa and K; tsc is the ground standard temperature, 293.15K; pi is the original formation pressure of the gas reservoir, MPa; t is the average gas layer temperature K; zi is the original gas deviation coefficient, and has no dimension.
Deflation range A of mountain 2 Mountain 2 Comprises the following steps:
in the formula: h is Mountain 2 Is the thickness of 2 segments of air layer in the mountain, phi Mountain 2 Porosity of 2 sections of mountain, sg Mountain 2 The 2 nd segment of the mountain contains gas saturation.
Preferably, after the dynamic control reserves and the air leakage areas of each layer of the gas well are measured, the development and use conditions of each layer section of the gas reservoir can be known, and a basis is provided for establishing a technical strategy for improving the reserve degree.
For example: indicating that the gas leakage range of 2 sections of a gas well mountain is 0.21km 2 One hole, it can be known that the reserve utilization degree of 2 segments of the mountain is low, and 5 wells (1 km) are required to be deployed per square kilometer 2 0.21 is approximately equal to 5) can realize the full effective utilization of reserves; the air leakage range of the mountain 1 section is 0.12km 2 Then, it can be known that the reserve utilization of 1 section of the mountain is less sufficient, and theoretically 8 wells per square kilometer (1 km) need to be deployed 2 0.12 ≈ 8) can realize the full effective utilization of the reserves.
Preferably, referring to fig. 1-3, a method for measuring the gas-containing area of each layer of the multi-layer low-permeability tight sandstone gas well is also provided, and is characterized in that the method adopts a dynamic layering splitting method, and comprises the following steps:
(1) The overall dynamic control reserve of an S3 gas well of a certain hypotonic-compact sandstone gas field is measured to be 0.2516 million square.
(2) And measuring the thicknesses of gas layers of 8 sections, 1 section, 2 sections and the Taiyuan group of the S3 gas well box, wherein the thicknesses are respectively 3.8m, 5.1m, 4.9m and 6.5m.
(3) According to the field test data, a quantitative relation between gas production capacities of the multilayer gas layer is established (see figure 1), and gas layer thickness standardization processing is carried out, wherein the standardized thicknesses of 8 sections of boxes, 1 section of mountains, 2 sections of mountains and a Taiyuan group are respectively 1.8m, 3.2m, 4.9m and 5.6m.
(4) And dynamically controlling splitting according to the standardized thickness ratio, wherein the dynamically controlled reserves of 8 sections of the box, 1 section of the mountain, 2 sections of the mountain and the Taiyuan group are respectively 0.0297 hundred million square, 0.0514 hundred million square, 0.0797 hundred million square and 0.0909 hundred million square.
(5) And (3) measuring parameters of porosity and saturation of the gas layer of each interval, and measuring the gas-containing area by adopting a volumetric method, wherein the gas area is equivalent to the gas leakage area of the gas well of the interval (see figure 3).
In conclusion, the beneficial effects of the invention are as follows:
the invention establishes the quantitative corresponding relation of the gas production capacities of different producing zones, carries out accurate thickness standardization treatment, establishes the gas production capacity quantitative relation according to the yield capacity difference of different intervals of the gas well on the basis of measuring the parameters of the porosity, the gas saturation and the like of the gas zone, carries out the thickness standardization treatment, and finally measures the dynamic control reserve and/or the gas leakage area of each layer through layering splitting, thereby providing a basis for the efficient development of the gas field.
The present invention is not limited to the specific embodiments described above. It will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention, which should be considered as within the scope of the invention.
Claims (1)
1. A method for measuring the gas-containing area of each layer of a multi-layer low-permeability tight sandstone gas well is characterized in that the method adopts dynamic layering splitting and comprises the following steps:
measuring the integral dynamic control reserve G of the gas well by adopting a pressure drop method, an unstable yield method or a flowing substance balancing method, and acquiring the integral dynamic control reserve G of the gas well under the condition of the combined layer mining;
carrying out on-site production capacity test of each production layer, obtaining production capacity data of different production layers, namely daily gas production of the production layers with unit thickness, establishing a quantitative relation among the gas production capacities of the gas layers of the layer system, and carrying out thickness standardization treatment, wherein the daily gas production of the production layers with unit thickness of each production layer is divided by the daily gas production of the production layer with unit thickness of the production layer with the strongest production capacity to obtain a thickness conversion coefficient of each production layer, and the standardized thickness of each production layer is obtained by multiplying the original thickness of each production layer by the corresponding thickness conversion coefficient;
splitting the integral dynamic control reserves G of the gas well under the condition of the combined-layer mining into dynamic control reserves of each layer according to the proportion of the standardized thickness of each producing layer to the total standard thickness;
dynamically controlling reserves of each layer based on splitting, and measuring the gas-containing area of each layer by adopting a volumetric method in combination with the measured porosity, gas-containing saturation and gas layer thickness of each layer section;
wherein the measured gas well single-layer gas-containing area A Mountain 2 Comprises the following steps:
in the formula: h is Mountain 2 Is the thickness of 2 segments of air layer in the mountain, phi Mountain 2 Porosity of 2 sections of mountain, sg Mountain 2 Is the 2 nd segment of the mountain with gas saturation, G Mountain 2 Dynamic control of reserves for the air layer of 2 segments of the hill, 10 8 m 3 (ii) a Psc is ground standard pressure, MPa; tsc is the ground standard temperature, 293.15K; pi is the original formation pressure of the gas reservoir, MPa; t is the average gas layer temperature, K; zi as the original gasA difference coefficient;
wherein, the gas layer of 2 sections of the mountain dynamically controls the reserve G Mountain 2 The method specifically comprises the following steps:
wherein H Box 8 ’、H Mountain 1 ’、H Mountain 2 ’、H Taiyuan ' standardized thickness of each producing zone respectively, and G is the integral dynamic control reserve of the gas well.
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