CN111396004A - Gas injection well gas suction profile parameter calculation method and device - Google Patents

Abstract

The invention discloses a gas injection well gas suction profile parameter calculation method and a device, wherein the method comprises the following steps: acquiring actual pressures of gas in the gas injection well at different depths; under the condition of neglecting the change of gas density, the actual pressure of the gas is subjected to linearization treatment, and the theoretical pressures of the gas in the gas injection well at different depths are determined; determining pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure; and calculating the gas suction proportion at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determining the gas suction profile of the gas injection well. The gas injection well gas suction profile parameter calculation method and device provided by the invention can accurately know the gas suction conditions at different depths of the gas injection well and determine the gas suction profile of the gas injection well without being influenced by complex factors such as impurity contamination of underground oil stains and the like and pipe column deformation.

Description

Method and device for calculating parameters of suction profile of gas injection well

technical field

The invention relates to the technical field of oilfield testing, in particular to a method and a device for calculating parameters of an inhalation profile of a gas injection well.

Background technique

With the continuous deepening of oilfield development, non-hydrocarbon gas injection development technology has gradually been applied on a large scale, and development measures such as injection of air, oxygen-reduced air, and nitrogen into the well have been applied more and more. In the process of operation, monitoring and analysis of downhole temperature, pressure and suction profile is an important means to understand and analyze the effect of gas injection and improve the production of gas injection wells.

At present, in the downhole gas flow test in oilfields, turbine flowmeter is usually used for steam flow test, but the lower limit of flow measurement of its range is high and the resolution is poor, which cannot meet the needs of small displacement non-hydrocarbon gas injection profile test. .

In addition, thermal mass flow meters can also be used for flow testing of non-hydrocarbon gases. Thermal mass flowmeters are better than turbine flowmeters in low-flow gas testing, but the measuring probes of this type of instrument are easily contaminated by impurities such as underground oil, resulting in abnormally large measured data and uninterpretable test data.

It can be seen that the monitoring and analysis of the existing inhalation profile all need to measure the gas flow, but the measurement results are not ideal and cannot meet the needs of accurate testing.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a method for calculating the parameters of the suction profile of a gas injection well, so as to be able to determine the suction profile of the gas injection well without measuring the gas flow in the gas injection well.

Above-mentioned purpose of the present invention can adopt following technical scheme to realize:

A method for calculating parameters of suction profile of a gas injection well, comprising:

Obtain the actual pressure of the gas in the gas injection well at different depths;

Under the condition of ignoring the change of gas density, the actual pressure of the gas is linearized to determine the theoretical pressure of the gas in the gas injection well at different depths;

determining pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

The suction ratio of the gas injection well at different depths is calculated according to the pressure loss values at different depths of the gas injection well, and the suction profile of the gas injection well is determined.

In a preferred embodiment, the step of determining the theoretical pressure includes:

Select two or more depth positions where the actual pressure changes linearly at different depths;

establishing at least one linear equation based on the linear variation;

determining a target linear equation in the at least one linear equation covering all depth locations and their actual pressures;

The theoretical pressures at different depth positions are determined according to the target linear equation.

In a preferred embodiment, two or more successively adjacent depth positions at different depths where the actual pressure changes linearly are selected.

In a preferred embodiment, at least one linear equation is established according to the following formula:

(P'-P _x )/(P'-P _y )=(hh _x )/(hh _y )

In the above formula, P _x is the actual pressure of the gas in the gas injection well at a depth of h _x , P _y is the actual pressure of the gas in the gas injection well at a depth of h _y , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; the units of P _x , P _y , and P' are MPa, and the units of h _x , _hy , and h are meters;

Determine the target linear equation as follows:

(P'-P _a )/(P'-P _b )=(hh _a )/(hh _b )

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; P _a , P _b , P' are in MPa, and _{ha, h b ,} and h are in meters;

Through the target linear equation, the theoretical pressure P' of the gas in the gas injection well at different depths is determined; the calculation formula of the theoretical pressure P' of the gas in the gas injection well at different depths is:

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; P _a , P _b , and P' are in MPa, and _{ha, h b ,} and h are in meters.

In a preferred embodiment, the calculation formula of the pressure loss value is:

ΔP=P′-P

In the above formula, P' is the theoretical pressure of the gas in the gas injection well, the unit is MPa; P is the actual pressure of the gas in the gas injection well, the unit is MPa; ΔP is the pressure loss value of the gas in the gas injection well, the unit is MPa .

In a preferred embodiment, the different depths include a first depth, a second depth, ···, the nth depth, where n is an integer not less than 3; the pressure loss values at the different depths represent are ΔP ₁ , ΔP ₂ , ΔP 2 , ΔP _n ; the calculation formula of the sum of the pressure loss values at the different depths is:

In the above formula, ΔP _i is the pressure loss value at the i-th depth of the gas injection well, in MPa; ΔP is the _sum of the pressure losses at different depths of the gas injection well, in MPa.

In a preferred embodiment, the calculation formula of the inhalation ratio is:

Sr = ΔP/ΔP _total × 100%

In the above formula, Sr is the suction ratio; ΔP is the pressure loss value of the gas in the gas injection well, in MPa; ΔP is the _sum of the pressure losses at different depths of the gas injection well, in MPa.

In a preferred embodiment, the actual pressure is measured by a pressure gauge.

In a preferred embodiment, the gas is air.

In a preferred embodiment, the method for calculating the parameters of the suction profile of the gas injection well further comprises determining the temperature of the gas in the gas injection well at different depths;

Correspondingly, calculating the suction ratio at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determining the suction profile of the gas injection well includes: determining according to the suction ratio and the temperature. The suction profile of the gas injection well.

A gas injection well suction profile parameter calculation device, comprising:

The parameter acquisition module is used to acquire the actual pressure of the gas in the gas injection well at different depths;

A theoretical pressure determination module, used for linearizing the actual pressure of the gas under the condition of ignoring gas density changes, to determine the theoretical pressures of the gas in the gas injection well at different depths;

a pressure loss value determination module, configured to determine pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

The suction profile determination module is configured to calculate the suction ratio at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determine the suction profile of the gas injection well.

In a preferred embodiment, a temperature determination module is further included for determining the temperature of the gas in the gas injection well at different depths.

The features and advantages of the present invention are: the method and device for calculating the parameters of the gas injection well suction profile provided by the present application do not need to measure the gas flow rate in the gas injection well, and are not affected by complex factors such as contamination of impurities such as downhole oil pollution, and deformation of the pipe string. The suction conditions of the gas injection wells at different depths can be accurately understood, and the suction profiles of the gas injection wells can be determined.

With reference to the following description and drawings, specific embodiments of the invention are disclosed in detail, indicating the manner in which the principles of the invention may be employed. It should be understood that embodiments of the present invention are not thereby limited in scope. Embodiments of the invention include many changes, modifications and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the step diagram of a kind of gas injection well suction profile parameter calculation method in the embodiment of the present application;

Fig. 2 is the concrete step diagram of step S12 in Fig. 1;

3 is a graph of actual pressure data of gas in a gas injection well at different depths in a specific embodiment of the present application;

FIG. 4 is a schematic diagram of a device for calculating the parameters of the suction profile of a gas injection well in an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening another element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or it may be intervening with the other element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

See Figure 1. FIG. 1 is a step diagram of a method for calculating the parameters of the suction profile of a gas injection well in an embodiment of the present application. The method for calculating the parameters of the suction profile of a gas injection well according to the present invention may include the following steps:

Step S10: obtaining the actual pressure of the gas in the gas injection well at different depths;

Step S12: Under the condition of ignoring the change of gas density, the actual pressure of the gas is linearized to determine the theoretical pressure of the gas in the gas injection well at different depths;

Step S14: Determine pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

Step S16: Calculate the suction ratio at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determine the suction profile of the gas injection well.

In this embodiment, the different depths include a first depth, a second depth, ···, an nth depth from top to bottom, where n is an integer not less than 3. The present application does not limit the intervals at different depths. Preferably, the intervals at different depths are equal. In order to obtain more accurate calculation results, the interval can be reduced and n can be increased.

Specifically, in the step S10, the actual pressure of the gas in the gas injection well at different depths is measured by a pressure gauge. The embodiments of the present application do not specifically limit the model of the manometer for measuring the actual pressure.

Specifically, as shown in FIG. 2 , the step S12 for determining the theoretical pressure may include the following steps:

Step S120: Select two or more depth positions where the actual pressure changes linearly in different depths;

Step S122: establishing at least one linear equation according to the linear change;

Step S124: Determine a target linear equation covering all depth positions and their actual pressures in the at least one linear equation;

Step S126: Determine theoretical pressures at different depth positions according to the target linear equation.

In order to better explain and understand the above steps, the following description is made by taking the actual pressure obtained at 10 different depths in step S10 and the interval between each depth point (also referred to as depth position) being equal as an example.

In step S120, if two points are selected, since the two points must change linearly, they can be selected arbitrarily. If three or more points are selected, the pressure difference of the actual pressure corresponding to the same depth difference needs to be equal for the three or more points, that is, the three or more points need to satisfy the change of the actual pressure with the depth. Linear change.

Preferably, two or more successively adjacent depth positions in different depths where the actual pressure changes linearly are selected. Selecting successively adjacent depth positions can reduce the number of calculations and improve the calculation efficiency. The actual pressure changes linearly, indicating that the total amount of gas in the injection wells in this section has not changed. When the gas is absorbed by the formation, the actual pressure there will be less than the theoretical pressure, so the actual pressure does not change linearly. It should be noted that if two or more non-adjacent depth positions are selected, and the selected depth positions have the minimum depth and the maximum depth, then all the depth points between the minimum depth and the maximum depth obtained in step S10 correspond to The actual pressure must meet the linear change of the selected depth position.

In step S122, according to the data at two or more depth positions where the actual pressure changes linearly selected in step S120, at least one linear equation is established, and the equation is shown in the following formula:

(P'-P _x )/(P'-P _y )=(hh _x )/(hh _y )

In the above formula, P _x is the actual pressure of the gas in the gas injection well at a depth of h _x , P _y is the actual pressure of the gas in the gas injection well at a depth of h _y , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; the units of P _x , P _y , and P' are MPa, and the units of h _x , _hy , and h are meters. Wherein, the actual pressures P _x and P _y at h _x and _hy change linearly, and preferably, h _x and _hy are adjacent to each other.

According to the assumed actual pressure at 10 different depths, if two points are selected, 45 linear equations as above can be established; if the selected two points are adjacent, 9 linear equations as above can be established, compared with 45 The number of calculations is greatly reduced and the calculation efficiency is improved. Of course, three or more points where the actual pressure changes linearly can also be selected to establish a linear equation.

In step S124, the target linear equation is as follows:

(P'-P _a )/(P'-P _b )=(hh _a )/(hh _b )

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; P _a , P _b , and P' are in MPa, and _{ha, h b ,} and h are in meters.

The above target linear equation covers all depth positions and their actual pressures, that is, the theoretical pressures at different depths calculated according to the target linear equation are not less than their actual pressures. Based on the assumed actual pressures at 10 different depths, the target linear equation satisfies the following:

Among them, P is the actual pressure of the gas in the gas injection well at the depth h, h ₁ ≤ h ≤ h ₁₀ .

In a preferred embodiment, more intuitively, a Cartesian coordinate system is established with the depth h as the x-axis and the actual pressure of the gas as the y-axis. According to the actual pressures at 10 different depths obtained in step S10, 10 coordinate points are obtained, and different linear equations are established. Draw the straight lines represented by these linear equations in the coordinate diagram, the said covering all depth positions and their actual pressure refers to any depth point, the actual pressure P corresponding to the depth point on the coordinate axis is not greater than the depth point in the linear equation represents the corresponding theoretical pressure P' on the straight line.

In another embodiment, it can also be understood as follows: the straight lines represented by these linear equations are drawn in the above-mentioned coordinate diagram, assuming that the target equation is P'=kh+b, then the area covered by it can be expressed as the following equation system:

When the 10 coordinate points obtained in step S10 all satisfy the above equation set, it can be considered that the linear equation is a target linear equation covering all depth positions and their actual pressures.

In step S126, through the above target linear equation, the theoretical pressure P' of the gas in the gas injection well at different depths is determined; the calculation formula of the theoretical pressure P' of the gas in the gas injection well at different depths is:

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; P _a , P _b , and P' are in MPa, and _{ha, h b ,} and h are in meters.

In the step S14, the calculation formula of the pressure loss value is:

ΔP=P′-P

In the above formula, P' is the theoretical pressure of the gas in the gas injection well, the unit is MPa; P is the actual pressure of the gas in the gas injection well, the unit is MPa; ΔP is the pressure loss value of the gas in the gas injection well, the unit is MPa .

The gas suction capacity of the formation at different depths is different, resulting in a non-linear variation of the gas pressure in the gas injection well. The pressure loss value is the difference between the theoretical pressure and the actual pressure. The larger the pressure loss value, the more the gas is absorbed at the place, that is, the suction capacity at the place is stronger.

Specifically, the calculation formula of the pressure loss value at different depths of the gas injection well is:

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P is the gas in the gas injection well at the depth of The actual pressure at h, ΔP is the pressure loss value of the gas in the gas injection well at the depth h; the units of P _a , P _b , P and ΔP are MPa, and the units of _{ha , h b ,} and h are meters.

In the step S16, the calculation formula of the suction ratio is:

Sr = ΔP/ΔP _total × 100%

In the above formula, Sr is the suction ratio; ΔP is the pressure loss value of the gas in the gas injection well, in MPa; ΔP is the _sum of the pressure losses at different depths of the gas injection well, in MPa.

In this embodiment, the pressure loss values at the different depths are expressed as ΔP ₁ , ΔP ₂ , . . . , ΔP _n ; the calculation formula for the sum of the pressure loss values at the different depths is:

In the above formula, ΔP _i is the pressure loss value at the i-th depth of the gas injection well, in MPa; ΔP is the _sum of the pressure losses at different depths of the gas injection well, in MPa.

Specifically, the formula for calculating the suction ratio at different depths of the gas injection well is:

In the above formula, Sr _i is the suction ratio at the i-th depth of the gas injection well; ΔP _i is the pressure loss value at the i-th depth of the gas injection well, in MPa.

The application does not specifically limit the type of gas, preferably, the gas is air.

In this embodiment, the method for calculating the parameters of the inhalation profile of the gas injection well may further include determining the temperature of the gas in the gas injection well at different depths, so as to enrich the parameters of the inhalation profile and provide better monitoring and analysis of the inhalation profile. reliable basis. The embodiments of the present application do not specifically limit the model of the thermometer for measuring temperature. Correspondingly, calculating the suction ratio at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determining the suction profile of the gas injection well (step S16) includes: according to the suction ratio, The temperature determines the suction profile of the gas injection well.

The method for calculating the parameters of the suction profile of the gas injection well provided by the embodiment of the present application does not need to measure the gas flow rate in the gas injection well, and is not affected by complex factors such as contamination of impurities such as downhole oil pollution and pipe string deformation, and can accurately understand the gas injection well at different depths. Inspiratory situation, determine the inhalation profile of the gas injection well.

In a specific embodiment, the gas in the gas injection well is air.

First obtain the actual pressure of the gas in the gas injection well at different depths. The actual pressure is measured by a high precision pressure gauge. At the same time, the temperature of the gas in the gas injection well at different depths is measured. The different depths include the first depth, the second depth, ···, the 30th depth, and the values corresponding to the different depths are expressed as h ₁ , h ₂ , ···, h ₃₀ , and the corresponding actual The pressure is represented by P ₁ , P ₂ , ···, P ₃₀ .

The actual pressure data of the gas in the gas injection well at different depths are shown in the table below. Plot the actual pressure data of the gas in the gas injection well at different depths according to the table below, as shown in Figure 3. It can be seen from the figure that there are two stages of pressure drop, namely the 15th to 19th depths and the 25th to 27th depths. In fact, there are two oil layers at 991.8-993.5m and 996.4-997.5m respectively. Air is absorbed by the oil layers, so there will be a sudden drop in pressure. It can be clearly seen from the figure that at depths 1 to 3, depths 4 to 14, depths 26 to 30, etc., the actual pressure changes linearly with depth, and the linear equation established according to the linear changes at depths 4 to 14 can All depth positions and their actual pressures are covered, so the linear equation established according to the linear changes at depths 4 to 14 is the target linear equation.

Determine the following objective equation:

(P'-P _a )/(P'-P _b )=(hh _a )/(hh _b )

In the above formula, P _a is the actual pressure of the gas in the gas injection well at the depth of h _a , P _b is the actual pressure of the gas in the gas injection well at the depth of h _b , and P' is the gas in the gas injection well at the depth of is the theoretical pressure at h; P _a , P _b , and P' are in MPa, and _{ha, h b ,} and h are in meters.

According to the theoretical pressure equations of the gas at different depths along the gas injection well, the theoretical pressure P' of the gas in the gas injection well at different depths is determined; the theoretical pressure P' of the gas in the gas injection well at different depths is determined The calculation formula is:

Substituting ha = h ₄ =986.3m, _{h b =} h ₅ =986.8m, P _a =P ₄ =5.8599MPa, and P _b =P ₅ =5.86MPa into the above formula, the calculation formula of the theoretical pressure P' is: P'=0.0002h+5.66264.

The pressure loss value is the difference between the theoretical pressure and the actual pressure, and its calculation formula is: ΔP=P′-P=0.0002h+5.66264-P.

The data brought into the table gives pressure loss values at different depths. For example, ΔP ₁₆ =0.0006MPa, and ΔP ₂₆ =0.0011MPa.

Finally, the inhalation ratio at different depths can be calculated:

In the above formula, Sr _i is the suction ratio at the i-th depth of the gas injection well; ΔP _i is the pressure loss value at the i-th depth of the gas injection well, in MPa.

According to the data in the table, the sum of the pressure loss values at different depths can be obtained _ΔPtotal =0.0125MPa. Then calculate the inhalation ratio at different depths. For example, Sr ₁₆ =4.8%, Sr ₂₆ =8.8%. From this, the suction profile can be determined.

The above is a specific example of realizing the determination of the suction profile by applying the method for calculating the parameters of the suction profile of the gas injection well provided by the embodiment of the present application.

Compared with the prior art, the method for calculating the parameters of the gas injection well suction profile provided by the present invention does not need to measure the gas flow rate in the gas injection well, and is not affected by complex factors such as contamination of impurities such as downhole oil pollution and pipe string deformation, and can accurately understand the gas flow rate in the gas injection well. The suction profiles at different depths of the gas injection well determine the suction profile of the gas injection well.

In view of the method for calculating the parameters of the suction profile of a gas injection well provided in the above embodiments, the present application provides a device for calculating the parameters of the suction profile of a gas injection well.

See Figure 4. The gas injection well suction profile parameter calculation device includes: a parameter acquisition module 20 , a theoretical pressure determination module 22 , a pressure loss value determination module 24 and a suction profile determination module 26 .

The parameter acquisition module 20 is used to acquire the actual pressure of the gas in the gas injection well at different depths;

The theoretical pressure determination module 22 is configured to perform linearization processing on the actual pressure of the gas under the condition of ignoring the gas density variation, so as to determine the theoretical pressure of the gas in the gas injection well at different depths;

The pressure loss value determination module 24 is configured to determine pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

The suction profile determination module 26 is configured to calculate the suction ratio at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determine the suction profile of the gas injection well.

In this embodiment, the computing device further includes a temperature determination module for determining the temperature of the gas in the gas injection well at different depths.

In this embodiment, the computing device embodiment corresponds to the computing method embodiment, which can realize the technical problem solved by the computing method embodiment, and correspondingly achieve the technical effect of the computing method embodiment. Repeat.

Any numerical value recited herein includes all values of the lower value and the upper value in one unit increments from the lower value to the upper value, there being a separation of at least two units between any lower value and any higher value That's it. For example, if the number of components or process variables (eg, temperature, pressure, time, etc.) are stated to have values from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the intent is to illustrate that the The specification also explicitly lists values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, and the like. For values less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples of what is intended to be express, and all possible combinations of numerical values recited between the lowest value and the highest value are considered to be expressly set forth in this specification in a similar fashion.

Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of" describing a combination shall include the identified element, ingredient, component or step as well as other elements, components, components or steps that do not materially affect the essential novel characteristics of the combination. Use of the terms "comprising" or "comprising" to describe combinations of elements, ingredients, components or steps herein also contemplates embodiments consisting essentially of those elements, ingredients, components or steps. By use of the term "may" herein, it is intended to indicate that "may" include any described attributes that are optional.

A plurality of elements, components, components or steps can be provided by a single integrated element, component, component or step. Alternatively, a single integrated element, component, component or step may be divided into separate multiple elements, components, components or steps. The disclosure of "a" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

It should be understood that the above description is for purposes of illustration and not limitation. From reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of being comprehensive. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to disclaim such subject matter, nor should it be construed that the inventor did not consider such subject matter to be part of the disclosed subject matter.

Claims (12)

1. A gas injection well gas suction profile parameter calculation method is characterized by comprising the following steps:

acquiring actual pressures of gas in the gas injection well at different depths;

under the condition of neglecting the change of gas density, the actual pressure of the gas is subjected to linearization treatment, and the theoretical pressures of the gas in the gas injection well at different depths are determined;

determining pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

and calculating the gas suction proportion at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determining the gas suction profile of the gas injection well.

2. The method of calculating gas injection well gas suction profile parameters of claim 1, wherein the step of determining a theoretical pressure comprises:

selecting two or more depth positions with linearly changed actual pressures in different depths;

establishing at least one linear equation according to the linear change;

determining a target linear equation covering all depth positions and actual pressures thereof in the at least one linear equation;

and determining theoretical pressures of different depth positions according to the target linear equation.

3. The method of claim 2, wherein two or more consecutive depth positions are selected at which the actual pressure varies linearly at different depths.

4. The method of calculating gas injection well gas suction profile parameters of claim 2, wherein the at least one linear equation is established according to the formula:

(P’-P_x)/(P’-P_y)＝(h-h_x)/(h-h_y)

in the above formula, P_xFor gas in a gas injection well at a depth h_xActual pressure of (P)_yFor gas in a gas injection well at a depth h_yThe actual pressure of (b), P', is the theoretical pressure of the gas in the gas injection well at a depth of h; p_x、P_yP' in MPa, h_x、h_yH is in meters;

the target linear equation is determined as follows:

(P’-P_a)/(P’-P_b)＝(h-h_a)/(h-h_b)

in the above formula, P_aFor gas in a gas injection well at a depth h_aActual pressure of (P)_bFor gas in a gas injection well at a depth h_bThe actual pressure of (b), P', is the theoretical pressure of the gas in the gas injection well at a depth of h; p_a、P_bP' in MPa, h_a、h_bH is in meters;

determining theoretical pressures P' of gas in the gas injection well at different depths through the target linear equation; the calculation formula of the theoretical pressure P' of the gas in the gas injection well at different depths is as follows:

in the above formula, P_aFor gas in a gas injection well at a depth h_aActual pressure of (P)_bFor gas in a gas injection well at a depth h_bThe actual pressure of (b), P', is the theoretical pressure of the gas in the gas injection well at a depth of h; p_a、P_bP' in MPa, h_a、h_bAnd h is given in meters.

5. The method of calculating gas injection well gas suction profile parameters of claim 1, wherein the pressure loss value is calculated by the formula:

ΔP＝P′-P

in the above formula, P' is the theoretical pressure of gas in the gas injection well and has the unit of megapascal; p is the actual pressure of the gas in the gas injection well and is in MPa; Δ P is the pressure loss value of the gas in the gas injection well in MPa.

6. The method of claim 1, wherein the different depths comprise a first depth, a second depth, and an nth depth, n being an integer not less than 3; the pressure loss values at the different depths are expressed as Δ P₁、ΔP₂、······、ΔP_n(ii) a The calculation formula of the sum of the pressure loss values at different depths is as follows:

in the above formula,. DELTA.P_iThe pressure loss value at the ith depth of the gas injection well is expressed in megapascals; delta P_{General assembly}The sum of the pressure loss values at different depths of the gas injection well is given in mpa.

7. The method for calculating parameters of a gas injection well gas suction profile according to claim 1, wherein the calculation formula of the gas suction proportion is as follows:

Sr＝ΔP/ΔP_{general assembly}×100％

In the above formula, Sr is the gettering proportion; delta P is the pressure loss value of gas in the gas injection well and is expressed in MPa; delta P_{General assembly}The sum of the pressure loss values at different depths of the gas injection well is given in mpa.

8. The method of calculating gas injection well gas suction profile parameters of claim 1, wherein the actual pressure is measured by a pressure gauge.

9. The method of calculating gas injection well gas suction profile parameters of claim 1, wherein the gas is air.

10. The method of calculating gas injection well inspiratory profile parameters of claim 1, further comprising determining the temperature of the gas in the gas injection well at different depths;

correspondingly, calculating the gas suction proportion at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well, and determining the gas suction profile of the gas injection well comprises the following steps: and determining the gas suction profile of the gas injection well according to the gas suction proportion and the temperature.

11. A gas injection well gas suction profile parameter calculation apparatus, comprising:

the parameter acquisition module is used for acquiring the actual pressure of the gas in the gas injection well at different depths;

the theoretical pressure determining module is used for carrying out linearization processing on the actual pressure of the gas under the condition of neglecting the change of the gas density, and determining the theoretical pressure of the gas in the gas injection well at different depths;

the pressure loss value determining module is used for determining pressure loss values at different depths of the gas injection well according to the theoretical pressure and the actual pressure;

and the gas suction profile determining module is used for calculating the gas suction proportion at different depths of the gas injection well according to the pressure loss values at different depths of the gas injection well and determining the gas suction profile of the gas injection well.

12. The gas injection well gas suction profile parameter calculation device of claim 11, further comprising a temperature determination module for determining the temperature of the gas in the gas injection well at different depths.

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