CN113092740A - Method and device for determining gas channeling prevention performance of cement paste - Google Patents
Method and device for determining gas channeling prevention performance of cement paste Download PDFInfo
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- CN113092740A CN113092740A CN201911340996.XA CN201911340996A CN113092740A CN 113092740 A CN113092740 A CN 113092740A CN 201911340996 A CN201911340996 A CN 201911340996A CN 113092740 A CN113092740 A CN 113092740A
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Abstract
The application discloses a method and a device for determining gas channeling prevention performance of cement paste, which belong to the technical field of detection, and the method comprises the following steps: acquiring a pressure value of first cement paste in a first container in a weight loss process; applying a channeling pressure to the second cement slurry in the second container, the channeling pressure P being measuredc1＝Pa1*(n1+1)，n1Is a first voltage doubling value; acquiring a first time length from the moment of applying the channeling pressure to the moment of generating the gas channeling of second cement paste in a second container; acquiring the pressure p of the first cement paste in the first container after the first time2(ii) a Obtaining a first differential pressure value delta P according to a first differential pressure formulam＝(Pa1‑P2)*(n1+1), determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value. The problem of the cement paste gas channeling prevention performance result is not accurate enough in the related technology is solved, and the effect of improving the accuracy is achieved.
Description
Technical Field
The application relates to the technical field of detection, in particular to a method and a device for determining gas channeling prevention performance of cement paste.
Background
At present, in the process of oil exploitation, in order to stabilize the well wall and simultaneously seal and separate oil, gas and water layers so as to prevent the oil, gas and water layers from channeling each other under different pressures, cement slurry is generally injected into an annular space between an oil pipe and a casing pipe so as to perform well cementation. However, as the well depth deepens, the temperature and the pressure at the bottom of the well are higher and higher, after cement slurry is injected into the well, in the transition process that the cement slurry is converted from a liquid state to a solid state, oil and gas are mixed into a cement stone matrix or gaps between cement and a casing pipe and between cement and an oil pipe under the action of pressure to cause interlayer mixing or mixing out of the well head, namely annular gas mixing, and the annular gas mixing seriously influences the production of the oil-gas well.
In the method, after the cement slurry is replaced in place, the thickening transition time, the gel strength development rate and the water loss rate of the cement slurry are detected, wherein the thickening transition time is the duration of the transition process of converting the cement slurry from a liquid state to a solid state, the gel strength development rate is the gel strength of the cement slurry in the transition process of converting the liquid state to the solid state, and the water loss rate is the size of the reduction rate of the pore pressure of the cement slurry. And obtaining the performance coefficient value of the cement paste through a cement paste performance coefficient formula, wherein the cement paste performance coefficient formula is as follows:
wherein SPNAs coefficient of cement paste properties, FLAPIIs the water loss rate of cement paste, t100BCAnd t30BCThe time at which the cement slurry had a consistency of 100 and 30, respectively. When S isPNWhen the value is between 1 and 3, the gas channeling prevention performance of the cement paste is better, and when S is in the rangePNWhen the value is between 3 and 6, the gas channeling prevention performance of the cement paste is moderate, and when S isPNWhen the value is more than 6, the gas channeling prevention performance of the cement paste is poor.
In the process of implementing the present application, the inventors found that the above manner has at least the following defects: the annular gas channeling usually occurs in the middle and later stages of cement slurry solidification, the water loss rate reflects the capability of the cement slurry for retaining the prepared slurry water in the early stage of cement hydration, and the thickening transition time reflects the time required by the cement slurry to flow from flowable state to non-flowable state, so that the gas channeling prevention performance result of the cement slurry determined by the method is not accurate enough.
Disclosure of Invention
In order to solve the problem that the determined result of the gas channeling prevention performance of the cement paste in the related technology is not accurate enough, the embodiment of the application provides a method and a device for determining the gas channeling prevention performance of the cement paste. The technical scheme is as follows:
according to a first aspect of the present application, there is provided a method for determining gas channeling prevention performance of cement slurry, the method comprising:
dividing a first target cement slurry into a first cement slurry and a second cement slurry which are the same;
injecting the first cement slurry into a first container and the second cement slurry into a second container;
acquiring a pressure value of the first cement slurry in the first container in a weight loss process;
applying a channeling pressure to the second cement slurry in the second container, the channeling pressure P being measuredc1＝Pa1*(n1+1) of said Pa1The initial pressure value of the first cement paste in the weight loss process is n1Is a first voltage doubling value;
acquiring a first time length from the moment of applying the channeling pressure to the moment of generating gas channeling of second cement paste in the second container;
acquiring the pressure p of the first cement paste in the first container when the first time duration passes2；
Obtaining a first differential pressure value according to a first differential pressure equation, the first differential pressure equation comprising:
ΔPm＝(Pa1-P2)*(n1+1), said Δ PmIs the first differential pressure value;
and determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
Optionally, after determining the gas channeling prevention capability of the first target cement slurry according to the differential pressure value, the method further includes:
dividing the second target cement slurry into the same third cement slurry and fourth cement slurry;
injecting the third cement slurry into a third container, and injecting the fourth cement slurry into a fourth container;
acquiring a pressure value of third cement paste in the third container in a weight loss process;
applying a channeling pressure to fourth cement slurry in the fourth container, the channeling pressure P being measuredc2＝Pa2*(n2+1) of said Pa2Is the initial pressure value of the third cement paste in the weight loss process, n2Is the second voltage doubling value;
acquiring a second time length from the moment of applying the channeling pressure to the moment of generating the gas channeling of fourth cement paste in the fourth container;
acquiring the pressure p of the third cement paste in the third container when the time duration passes3；
Obtaining a differential pressure value according to a second differential pressure equation, the second differential pressure equation comprising:
ΔPn＝(Pa2-P3)*(n2+1), said Δ PnIs the second differential pressure value;
and determining the gas channeling prevention capacity of the second target cement slurry at the second pressure doubling value according to the second pressure difference value.
Optionally, after determining the gas channeling prevention capability of the target cement slurry at the second pressure doubling value according to the second pressure difference value, the method further includes:
when the first pressure doubling value is equal to the second pressure doubling value, comparing the first time length with the second time length, wherein the shorter corresponding cement paste in the first time length and the second time length has poorer gas channeling prevention performance;
when the difference value between the first time length and the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd said second differential pressure value Δ PnSaid first differential pressure value Δ PmAnd said second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
Optionally, after applying the channeling pressure to the second cement slurry in the second container, the method further comprises:
obtaining the termination pressure of the second cement paste in the second container after the preset time of the second cement paste in the second container at the moment of applying the channeling pressure, wherein the termination pressure P isy1＝p2*(n1+1)；
Obtaining the first pressure differential value according to a third pressure differential equation comprising:
ΔPm＝Pc1-Py1said Δ PmIs the first differential pressure value.
Optionally, a value range of the first voltage doubling value is 5 to 10, and a value range of the second voltage doubling value is 5 to 10.
According to a second aspect of the present application, there is provided a cement slurry gas channeling prevention performance determination apparatus, the apparatus comprising:
the first assembling module is used for dividing the first target cement slurry into the same first cement slurry and second cement slurry;
injecting the first cement slurry into a first container and the second cement slurry into a second container;
the first weight loss module is used for acquiring the pressure value of the first cement paste in the first container in the weight loss process;
a first channeling measurement module for applying channeling measurement pressure to the second cement slurry in the second container, wherein the channeling measurement pressure Pc1＝Pa1*(n1+1) of said Pa1The initial pressure value of the first cement paste in the weight loss process is n1Is a first voltage doubling value;
the first time length acquisition module is used for acquiring a first time length from the moment of applying the channeling pressure to the moment of generating gas channeling of the second cement slurry in the second container;
a first pressure obtaining module, configured to obtain a pressure p of the first cement slurry in the first container when the first time duration elapses2；
A first differential pressure value obtaining module configured to obtain a first differential pressure value according to a first differential pressure formula, where the first differential pressure formula includes:
ΔPm＝(Pa1-P2)*(n1+1), said Δ PmIs the first differential pressure value;
the first determining module is used for determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
Optionally, the apparatus further comprises:
the second assembling module is used for dividing the second target cement slurry into the same third cement slurry and fourth cement slurry;
injecting the third cement slurry into a third container, and injecting the fourth cement slurry into a fourth container;
the second weight loss module is used for acquiring a pressure value of the third cement slurry in the third container in the weight loss process;
a second channeling measurement module for applying channeling measurement pressure to the fourth cement slurry in the fourth container, wherein the channeling measurement pressure Pc2＝Pa2*(n2+1) of said Pa2Is the initial pressure value of the third cement paste in the weight loss process, n2Is the second voltage doubling value;
the second duration acquisition module is used for acquiring a second duration between the moment of applying the channeling pressure to the moment of generating the gas channeling by using fourth cement slurry in the fourth container;
second pressureAn obtaining module, configured to obtain a pressure p of the third cement slurry in the third container when the time duration elapses3；
A second differential pressure value obtaining module, configured to obtain a differential pressure value according to a differential pressure formula, where the differential pressure formula includes:
ΔPn＝(Pa2-P3)*(n2+1), said Δ PnIs the second differential pressure value;
and the second determining module is used for determining the gas channeling prevention capacity of the second target cement slurry at the second pressure doubling value according to the second pressure difference value.
Optionally, the apparatus further includes a comparison module, configured to compare the first duration and the second duration when the first voltage doubling value is equal to the second voltage doubling value, where a shorter corresponding cement slurry in the first duration and the second duration has a poor gas channeling prevention performance;
when the difference value between the first time length and the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd said second differential pressure value Δ PnSaid first differential pressure value Δ PmAnd said second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
Optionally, the first differential pressure value obtaining module further includes:
obtaining the termination pressure of the second cement paste in the second container after the preset time of the second cement paste in the second container at the moment of applying the channeling pressure, wherein the termination pressure P isy1＝p2*(n1+1)；
Obtaining the first pressure differential value according to a third pressure differential equation comprising:
ΔPm＝Pc1-Py1said Δ PmIs the first differential pressure value.
Optionally, a value range of the first voltage doubling value is 5 to 10, and a value range of the second voltage doubling value is 5 to 10.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the method comprises the steps of dividing first target cement paste into the same first cement paste and second cement paste, injecting the first cement paste into a first container, obtaining a pressure value of the first cement paste in a weight loss process in the first container, injecting the second cement paste into a second container, applying a channeling measurement pressure to the second cement paste in the second container, obtaining a first time length from a moment when the channeling measurement pressure is applied to the second cement paste in the second container to a moment when gas channeling occurs, obtaining a long-time pressure of the first cement paste in the first container after the first time length passes, obtaining a first pressure difference value according to a first pressure difference formula, determining the gas channeling prevention capability of the first target cement paste at a first multiple pressure value according to the first pressure difference value, wherein the gas channeling prevention capability is in positive correlation with the pressure difference value. According to the gas channeling prevention performance of the cement paste determined by the cement paste at the moment when the gas channeling occurs and the pressure values of the cement paste in the gas channeling occurrence process, the obtained data and results can reflect the gas channeling prevention performance of the cement paste under the actual use condition, the problem that the result of the gas channeling prevention performance of the cement paste in the related technology is not accurate enough is solved, and the effect of improving the accuracy is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flow chart of a method for determining gas channeling prevention performance of cement slurry according to an embodiment of the present application;
FIG. 2-1 is a flow chart of another method for determining the gas channeling prevention performance of cement slurry provided in the embodiments of the present application;
FIG. 2-2 is a flow chart of another method for determining the gas channeling prevention performance of cement slurry provided in the embodiments of the present application;
FIG. 3 is a flow diagram of sub-steps of step 207;
fig. 4 is a schematic structural diagram of a cement slurry gas channeling prevention performance determination device provided in an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
At present, after well cementation, annular gas generated by oil and gas in a well is blown by, and part of the oil and gas is blown out of the annular space of a wellhead, so that the wellhead and the annular space are subjected to oil and gas pumping, and oil and gas resource waste is caused; and part of oil and gas generate cross flow among different pressure systems in the well, so that the reasonable development of the oil field is influenced while the recovery ratio is reduced. And the gas channeling can cause the casing to be eroded and corroded by formation fluid, reducing the strength and the service life of the casing. In addition, severe annular gas breakthrough can also cause over-pressure at the wellhead leading to uncontrolled blowout. Therefore, the gas channeling prevention performance of the cement paste is determined in advance, and it is particularly important to put the proper cement paste into the annular space under different working conditions.
In determining the gas channeling prevention performance of the cement slurry in the related art, the analysis is generally performed focusing on the analysis of the characteristics of the cement slurry itself, and illustratively, the analysis of the performance of the cement slurry is performed from the thickening transition time, the gel strength development rate, and the water loss rate of the cement slurry. However, after the cement slurry is injected into the well, that is, under actual conditions, the factors affecting the gas channeling performance of the cement slurry also include the pressure in the well, the height of the cement slurry column and other actual factors, so that the method for determining the gas channeling prevention performance of the cement slurry provided in the related art cannot accurately reflect the gas channeling prevention performance of the cement slurry under the actual conditions.
The embodiment of the application provides a method and a device for determining the gas channeling prevention performance of cement paste, which can solve the problem in the related art.
Fig. 1 is a flowchart of a method for determining gas channeling prevention performance of cement slurry according to an embodiment of the present application. The method for determining the gas channeling prevention performance of the cement paste comprises the following steps:
And 103, acquiring the pressure value of the first cement paste in the first container in the weight loss process.
And 105, acquiring a first time length from the moment of applying the channeling pressure to the moment of generating the gas channeling of the second cement paste in the second container.
106, acquiring the pressure p of the first cement paste in the first container when the first time length elapses2。
ΔPm＝(Pa1-P2)*(n1+1)，ΔPmis a first differential pressure value.
And 108, determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
To sum up, according to the method for determining the gas channeling prevention performance of the cement paste provided by the embodiment of the application, the first target cement paste is divided into the same first cement paste and the same second cement paste, the first cement paste is injected into the first container, the pressure value of the first cement paste in the first container in the weight loss process is obtained, the second cement paste is injected into the second container, the channeling measurement pressure is applied to the second cement paste in the second container, the first time length from the moment when the second cement paste in the second container applies the channeling measurement pressure to the moment when the gas channeling occurs is obtained, the pressure of the first cement paste in the first container after the first time length is obtained, the first pressure difference value is obtained according to the first pressure difference formula, the gas channeling prevention performance of the first target cement paste at the first double pressure value is determined according to the first pressure difference value, and the gas channeling prevention performance is positively correlated to the pressure difference value. According to the gas channeling prevention performance of the cement paste determined by the cement paste at the moment when the gas channeling occurs and the pressure values of the cement paste in the gas channeling occurrence process, the obtained data and results can reflect the gas channeling prevention performance of the cement paste under the actual use condition, the problem that the result of the gas channeling prevention performance of the cement paste in the related technology is not accurate enough is solved, and the effect of improving the accuracy is achieved.
Referring to fig. 2, a schematic structural diagram of another method for determining gas channeling prevention performance of cement slurry provided in an embodiment of the present application is shown, where the method for determining gas channeling prevention performance of cement slurry may include:
The first target cement slurry is prepared in advance, and reference may be made to "GB/T19139-2012 oil well cement test method" for a method of preparing cement slurry, which is not described herein again in the embodiments of the present application. And carrying out density test on the prepared cement paste and recording the density of the cement paste. And dividing the prepared first target cement slurry into two parts with the same weight, namely the first cement slurry and the second cement slurry.
The first container and the second container may be two containers in one test instrument or may be different test instruments. The first container and the second container are connected through the data sensor, so that the state and data of cement paste in the first container and the second container during the test can be transmitted in real time.
The weight loss process of the cement paste refers to the phenomenon that in the process of setting the cement paste, part of liquid cement paste is adhered to the inner wall of a shaft in the process of setting, so that the pressure of a liquid column in the shaft is gradually reduced. When the pressure of the cement slurry column is lower than the pressure of the stratum due to weight loss, the fluid in the stratum invades the annular space to form annular space gas channeling. The first container is a container for simulating an annular space in a shaft, the first container can test pressure change of cement paste in a weight loss process, the bottom of the first container comprises a pressure sensor, the pressure change of the cement paste relative to the bottom of a bottom layer in a solidification process of the cement paste can be measured in real time, and data of the pressure sensor can be transmitted into the second container in real time. The pressure value of the first cement paste obtained by the pressure sensor in the weight loss process can include an initial pressure value when the cement paste is injected into the first container, a pressure change of the cement paste in the weight loss process and a termination pressure after the cement paste is solidified.
The channeling pressure is the pressure of the stratum in the simulated shaft of the second container, namely the pressure of the stratum acting on the bottom of cement slurry after the cement slurry is injected into the shaft. The pressure multiplier is the height of a cement slurry column simulated in a gas state in a well bore. And measuring channeling pressure, namely applying the cement slurry to the second container from the bottom, and simulating the height of the cement slurry column from the top of the second container by using the first pressure doubling value. (n)1+1) is the first voltage doubling value plus 1, and since the second container itself contains the actual height of the cement paste, the actual height of the cement paste in the second container is regarded as 1, and at this time (n)1+1) is the height of the column of simulated cement slurry in the wellbore. In the embodiment of the application, the value range of the first voltage doubling value is 5-10. In addition, the value range of the first cement slurry may also be 0 to 10, and the embodiment of the present application is not limited herein.
And taking the time point of starting to apply the channeling pressure to the cement slurry in the second container as initial time, wherein the time difference between the moment of generating the gas channeling and the initial time is the first duration. After the occurrence of the gas breakthrough, the experimental tests in the second vessel can continue.
A data sensor is arranged between the first container and the second container, so that when the cement paste in the second container is blown by gas, the pressure sensor in the first container automatically records the current pressure value p of the cement paste in the first container2. The pressure value p2Namely the pressure value at the moment when the gas channeling of the cement paste occurs.
ΔPm＝(Pa1-P2)*(n1+1)，ΔPmis a first differential pressure value.
Pa1Is the initial pressure value, P, of the first cement slurry in the weight loss process2Is the pressure of the first cement slurry over the first time period, n1Is the first voltage doubling value. First differential pressure value Δ PmIs an important factor for determining the gas channeling prevention performance of the cement paste.
Step 204-mA first differential pressure value Δ PmThe method of substeps 2071 and 2072 can also be used for obtaining, and the method comprises the following specific steps:
And after the second cement paste generates gas channeling in the second container, the test is continued until the test is finished, and the pressure of the second cement paste in the second container is the termination pressure of the second cement paste in the second container. The testing time of the cement paste is different, and the interval between the time when the cement paste generates gas channeling and the testing time of the cement paste is variable, so that the termination pressure of the second cement paste in the second container is not equal to the pressure of the second cement paste at the time when the gas channeling occurs.
ΔPm＝Pc1-Py1，ΔPmis a first differential pressure value.
Pc1The channeling pressure applied to the second cement slurry in the second container, i.e., the initial pressure at which the second cement slurry begins to be tested in the second container, and thus, the channeling pressure Pc1Minus the end pressure Py1I.e., the initial pressure of the second slurry in the second container minus the terminal pressure of the second slurry in the second container. When the instrument cannot perform a weightlessness experiment of the first container, that is, when the pressure value at the gas channeling moment cannot be obtained, the second container can be used for performing the experiment, and the first differential pressure value is obtained through the third differential pressure formula.
And 208, determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
The smaller the first differential pressure value of the first target cement slurry is, the poorer the gas channeling prevention capability of the first target cement slurry is; the greater the first differential pressure value of the first target cement slurry, the better the gas channeling prevention ability of the first target cement slurry. The gas channeling prevention performance of the cement paste is determined through the first pressure difference value obtained by the pressure values of the cement paste in the testing process and at the gas channeling moment, the result is closer to the gas channeling prevention performance of the cement paste under the actual working condition, and therefore the determined gas channeling prevention performance of the cement paste is more accurate.
And 209, dividing the second target cement slurry into a third cement slurry and a fourth cement slurry which are the same.
The second target cement slurry is prepared in advance, and reference may be made to "GB/T19139-2012 oil well cement test method" for a method of preparing cement slurry, which is not described herein again in the embodiments of the present application. And carrying out density test on the prepared cement paste and recording the density of the cement paste. And dividing the prepared second target cement slurry into two parts with the same weight, namely a third cement slurry and a fourth cement slurry.
Referring to step 202, details of the embodiment of the present application are not described herein.
And step 211, acquiring a pressure value of the third cement slurry in the third container in the weight loss process.
The obtaining method refers to step 203, and details of the embodiments of the present application are not described herein.
Referring to step 204, the embodiments of the present application are not described herein again. Wherein the second voltage doubling value is 5-10, and can also be 0-10.
And step 213, acquiring a second time length from the moment of applying the channeling pressure to the moment of generating the gas channeling of the fourth cement slurry in the fourth container.
The obtaining method refers to step 205, and details of the embodiment of the present application are not described herein.
The obtaining method refers to step 206, and details of the embodiment of the present application are not described herein.
ΔPn＝(Pa2-P3)*(n2+1)，ΔPnis the second differential pressure value.
Step 212-215 is a first method for obtaining the second differential pressure value. The second method for obtaining the second differential pressure value can refer to steps 2071 and 2072. The embodiments of the present application are not described herein in detail.
And step 216, determining the gas channeling prevention capacity of the second target cement slurry at the second pressure doubling value according to the second pressure difference value.
In the specific determination process, referring to step 208, after the second pressure difference value of the second target cement slurry is obtained, the second target cement slurry may be compared with the first target cement slurry, and the cement slurry with better gas channeling prevention performance in the two cement slurries is determined. For a specific comparison, as described in step 217.
when the difference between the first time length and the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd a second differential pressure value Δ PnFirst differential pressure value Δ PmAnd a second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
When the first target cement slurry and the second target cement slurry are cement slurries of different systems, the step 201-. Wherein the first voltage doubling value is equal to the second voltage doubling value, and the channeling pressure P is measuredc1And measuring the channeling pressure Pc2Are equal. The grout where gas channeling occurs has poor properties compared to the first target grout and the second target grout. If the first target cement slurry and the second target cement slurry have gas channeling, comparing the first duration with the second duration, wherein the cement slurry with the shorter duration value is the cement slurry with the poorer performance before the gas channeling time; if the first target cement paste and the second target cement paste generate gas channeling and the difference value between the first time length and the second time length is within 15 minutes, comparing the first pressure difference value with the second pressure difference value, and the cement paste with smaller pressure difference value has poorer performance.
When the gas channeling prevention performance of only one cement slurry is determined, the steps 201 and 208 are repeated to obtain the relevant data of the first target cement slurry under different pressure doubling values and channeling measurement pressures. Lower voltage doubling value and channeling pressure P2The cement slurry with gas channeling is poor in gas channeling prevention performance, and exemplarily, the same kind of cement slurry cannot generate gas channeling at the pressure doubling value of 6 and generates gas channeling at the pressure doubling value of 8, and the kind of cement slurry can be put into the cement slurry at the pressure doubling value of 6When the pressure in the well exceeds the pressure doubling value of 8 in actual production, the cement paste is not recommended to be used.
If no gas channeling occurs, the cement paste performance under the pressure doubling value with a small pressure difference value is poor.
In addition, when the gas channeling prevention performance of only one kind of cement paste is determined, the pressure difference value may be obtained through the step 2071 and the step 2072 without performing the weight loss test.
The pressure value data such as the voltage doubling value and the like and the pressure value in actual production can be converted through software.
The implementation manner of the embodiment of the application is as follows:
acquiring a first target cement slurry by using 1000g grade cement +440g purified water, dividing the first target cement slurry into two parts, placing the two parts into a first container and a second container, wherein the container temperature of the first container and the second container is 60 ℃ under normal pressure, and referring to step 201 and step 207, the acquired relevant data of the first target cement slurry are shown in the following table 1:
obtaining a second target cement slurry by using 1000g of class G large sample ash +440g of large sample water, dividing the second target cement slurry into two parts, placing the two parts into a third container and a fourth container, wherein the container temperature of the third container and the fourth container is 60 ℃ under normal pressure, and referring to step 209-215, the obtained relevant data of the second target cement slurry are shown in the following table 2:
TABLE 1 first target grout
| Cement slurry density (g/cm)3) | 1.90 |
| Initial pressure of weight loss (kPa) | 18.6 |
| End pressure of weight loss (kPa) | 11.7 |
| Doubling value (kPa) | 2 |
| Channeling pressure (kPa) | 55.8 |
| Measurement of channeling initial pressure (kPa) | 55.8 |
| Measurement of channeling termination pressure (kPa) | Is free of |
| Loss in weight pressure value (kPa) | 44.9 |
| First differential pressure value (kPa) | 10.9 |
| First time (min) | 26 |
TABLE 2 second target grout
| Cement slurry density (g/cm)3) | 1.90 |
| Initial pressure of weight loss (kPa) | 18.6 |
| Weight lossEnd pressure (kPa) | 11.7 |
| Doubling value (kPa) | 2 |
| Channeling pressure (kPa) | 55.8 |
| Measurement of channeling initial pressure (kPa) | 55.8 |
| Measurement of channeling termination pressure (kPa) | 35.3 |
| Loss in weight pressure value (kPa) | Is free of |
| Pressure difference (kPa) | Is free of |
| Time of gas channeling (min) | Is free of |
Comparing the first target cement slurry with the second target cement slurry, as shown in table 1, the first target cement slurry generates gas channeling at 60 ℃ for 26min, and the pressure difference is 10.9kPa, which indicates that the gas channeling prevention performance of the grade G cement is poor.
As shown in table 2, the second target cement slurry did not undergo gas channeling under the condition of 60 ℃, and thus the gas channeling prevention performance of the second target cement slurry was better.
To sum up, according to the method for determining the gas channeling prevention performance of the cement paste provided by the embodiment of the application, the first target cement paste is divided into the same first cement paste and the same second cement paste, the first cement paste is injected into the first container, the pressure value of the first cement paste in the first container in the weight loss process is obtained, the second cement paste is injected into the second container, the channeling measurement pressure is applied to the second cement paste in the second container, the first time length from the moment when the second cement paste in the second container applies the channeling measurement pressure to the moment when the gas channeling occurs is obtained, the pressure of the first cement paste in the first container after the first time length is obtained, the first pressure difference value is obtained according to the first pressure difference formula, the gas channeling prevention performance of the first target cement paste at the first double pressure value is determined according to the first pressure difference value, and the gas channeling prevention performance is positively correlated to the pressure difference value. According to the gas channeling prevention performance of the cement paste determined by the cement paste at the moment when the gas channeling occurs and the pressure values of the cement paste in the gas channeling occurrence process, the obtained data and results can reflect the gas channeling prevention performance of the cement paste under the actual use condition, the problem that the result of the gas channeling prevention performance of the cement paste in the related technology is not accurate enough is solved, and the effect of improving the accuracy is achieved.
Fig. 4 is a schematic structural diagram of a soil temperature detection device according to an embodiment of the present application, where the cement slurry gas channeling prevention performance determination device 400 includes:
a first assembling module 401 for dividing a first target cement slurry into a first cement slurry and a second cement slurry which are the same; a first slurry is injected into the first container and a second slurry is injected into the second container.
The first weight loss module 402 is configured to acquire a pressure value of the first cement slurry in the first container during a weight loss process.
A first channeling measurement module 403 for applying a channeling measurement pressure, P, to the second cement slurry in the second containerc1＝Pa1*(n1+1)，Pa1Is the initial pressure value of the first cement paste in the weight loss process, n1Is the first voltage doubling value.
A first time length obtaining module 404, configured to obtain a first time length between a time when the channeling pressure is applied and a time when gas channeling occurs, of the second cement slurry in the second container.
A first pressure obtaining module 405 for obtaining the first cement slurry in the first container when the first cement slurry passes through the first timeLong time pressure p2。
A first differential pressure value obtaining module 406, configured to obtain a first differential pressure value according to a first differential pressure formula, where the first differential pressure formula includes:
ΔPm＝(Pa1-P2)*(n1+1)，ΔPmis a first differential pressure value.
The first determining module 407 is configured to determine, according to the first pressure difference value, a gas channeling prevention capability of the first target cement slurry at the first pressure doubling value, where the gas channeling prevention capability is positively correlated with the pressure difference value.
The second assembling module 408 is configured to divide the second target cement slurry into a third cement slurry and a fourth cement slurry, which are the same, inject the third cement slurry into the third container, and inject the fourth cement slurry into the fourth container.
And the second weight loss module 409 is configured to obtain a pressure value of the third cement slurry in the third container in the weight loss process.
A second channeling measurement module 410 for applying a channeling measurement pressure, P, to the fourth cement slurry in the fourth containerc2＝Pa2*(n2+1)，Pa2Is the initial pressure value of the third cement paste in the weight loss process, n2A second voltage multiplier.
The second duration obtaining module 411 is configured to obtain a second duration between a time when the channeling pressure is applied to the fourth cement slurry in the fourth container and a time when the gas channeling occurs.
A second pressure obtaining module 412 for obtaining the pressure p of the third cement slurry in the third container when the third cement slurry passes through the time3。
A second pressure difference value obtaining module 413, configured to obtain the pressure difference value according to a pressure difference formula, where the pressure difference formula includes:
ΔPn＝(Pa2-P3)*(n2+1)，ΔPnis the second differential pressure value.
And a second determining module 414, configured to determine, according to the second differential pressure value, a gas channeling prevention capability of the second target cement slurry at the second doubled differential pressure value.
The comparison module 415 is configured to compare the first duration and the second duration when the first voltage doubling value is equal to the second voltage doubling value, where the shorter corresponding cement slurry in the first duration and the second duration has poor gas channeling prevention performance.
When the difference between the first time length and the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd a second differential pressure value Δ PnFirst differential pressure value Δ PmAnd a second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
Optionally, the first differential pressure value obtaining module further includes: obtaining the termination pressure of the second cement paste in the second container after the preset time of the second cement paste in the second container at the moment of applying the channeling pressure, and the termination pressure Py1＝p2*(n1+ 1); obtaining the first pressure differential value according to a third pressure differential equation, the third pressure differential equation comprising:
ΔPm＝Pc1-Py1，ΔPmis a first differential pressure value.
Optionally, the value range of the first voltage doubling value is 5 to 10, and the value range of the second voltage doubling value is 5 to 10.
To sum up, according to the device for determining the gas channeling prevention performance of the cement paste provided by the embodiment of the application, the first target cement paste is divided into the same first cement paste and the same second cement paste, the first cement paste is injected into the first container, the pressure value of the first cement paste in the first container in the weight loss process is obtained, the second cement paste is injected into the second container, the channeling measurement pressure is applied to the second cement paste in the second container, the first time length from the moment when the second cement paste in the second container applies the channeling measurement pressure to the moment when the gas channeling occurs is obtained, the pressure of the first cement paste in the first container after the first time length is obtained, the first pressure difference value is obtained according to the first pressure difference formula, the gas channeling prevention performance of the first target cement paste at the first double pressure value is determined according to the first pressure difference value, and the gas channeling prevention performance is positively correlated to the pressure difference value. According to the gas channeling prevention performance of the cement paste determined by the cement paste at the moment when the gas channeling occurs and the pressure values of the cement paste in the gas channeling occurrence process, the obtained data and results can reflect the gas channeling prevention performance of the cement paste under the actual use condition, the problem that the result of the gas channeling prevention performance of the cement paste in the related technology is not accurate enough is solved, and the effect of improving the accuracy is achieved.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (10)
1. A method for determining gas channeling prevention performance of cement paste, the method comprising:
dividing a first target cement slurry into a first cement slurry and a second cement slurry which are the same;
injecting the first cement slurry into a first container and the second cement slurry into a second container;
acquiring a pressure value of the first cement slurry in the first container in a weight loss process;
applying a channeling pressure to the second cement slurry in the second container, the channeling pressure P being measuredc1＝Pa1*(n1+1) of said Pa1The initial pressure value of the first cement paste in the weight loss process is n1Is a first voltage doubling value;
acquiring a first time length from the moment of applying the channeling pressure to the moment of generating gas channeling of second cement paste in the second container;
acquiring the pressure p of the first cement paste in the first container when the first time duration passes2；
Obtaining a first differential pressure value according to a first differential pressure equation, the first differential pressure equation comprising:
ΔPm＝(Pa1-P2)*(n1+1), said Δ PmIs the first differential pressure value;
and determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
2. The method of claim 1, wherein after determining the gas channeling prevention capability of the first target cement slurry from the differential pressure value, the method further comprises:
dividing the second target cement slurry into the same third cement slurry and fourth cement slurry;
injecting the third cement slurry into a third container, and injecting the fourth cement slurry into a fourth container;
acquiring a pressure value of third cement paste in the third container in a weight loss process;
applying a channeling pressure to fourth cement slurry in the fourth container, the channeling pressure P being measuredc2＝Pa2*(n2+1) of said Pa2Is the initial pressure value of the third cement paste in the weight loss process, n2Is the second voltage doubling value;
acquiring a second time length from the moment of applying the channeling pressure to the moment of generating the gas channeling of fourth cement paste in the fourth container;
acquiring the pressure p of the third cement paste in the third container when the time duration passes3；
Obtaining a differential pressure value according to a second differential pressure equation, the second differential pressure equation comprising:
ΔPn＝(Pa2-P3)*(n2+1), said Δ PnIs the second differential pressure value;
and determining the gas channeling prevention capacity of the second target cement slurry at the second pressure doubling value according to the second pressure difference value.
3. The method of claim 2, wherein after determining the gas channeling prevention capability of the target cement slurry at the second pressure doubling value from the second pressure differential value, the method further comprises:
when the first pressure doubling value is equal to the second pressure doubling value, comparing the first time length with the second time length, wherein the shorter corresponding cement paste in the first time length and the second time length has poorer gas channeling prevention performance;
when the first duration is equal toWhen the difference value of the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd said second differential pressure value Δ PnSaid first differential pressure value Δ PmAnd said second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
4. The method of claim 1, wherein after the applying of the channeling pressure to the second cement slurry in the second container, the method further comprises:
obtaining the termination pressure of the second cement paste in the second container after the preset time of the second cement paste in the second container at the moment of applying the channeling pressure, wherein the termination pressure P isy1＝p2*(n1+1)；
Obtaining the first pressure differential value according to a third pressure differential equation comprising:
ΔPm＝Pc1-Py1said Δ PmIs the first differential pressure value.
5. The method of claim 1, wherein the first voltage multiplier ranges from 5 to 10 and the second voltage multiplier ranges from 5 to 10.
6. A cement slurry gas channeling prevention performance determination apparatus, characterized in that the apparatus comprises:
the first assembling module is used for dividing the first target cement slurry into the same first cement slurry and second cement slurry;
injecting the first cement slurry into a first container and the second cement slurry into a second container;
the first weight loss module is used for acquiring the pressure value of the first cement paste in the first container in the weight loss process;
a first channeling measurement module for applying channeling measurement pressure to the second cement slurry in the second container, wherein the channeling measurement pressure Pc1＝Pa1*(n1+1) of said Pa1The initial pressure value of the first cement paste in the weight loss process is n1Is a first voltage doubling value;
the first time length acquisition module is used for acquiring a first time length from the moment of applying the channeling pressure to the moment of generating gas channeling of the second cement slurry in the second container;
a first pressure obtaining module, configured to obtain a pressure p of the first cement slurry in the first container when the first time duration elapses2；
A first differential pressure value obtaining module configured to obtain a first differential pressure value according to a first differential pressure formula, where the first differential pressure formula includes:
ΔPm＝(Pa1-P2)*(n1+1), said Δ PmIs the first differential pressure value;
the first determining module is used for determining the gas channeling prevention capability of the first target cement slurry at the first pressure doubling value according to the first pressure difference value, wherein the gas channeling prevention capability is positively correlated with the pressure difference value.
7. The apparatus of claim 6, further comprising:
the second assembling module is used for dividing the second target cement slurry into the same third cement slurry and fourth cement slurry;
injecting the third cement slurry into a third container, and injecting the fourth cement slurry into a fourth container;
the second weight loss module is used for acquiring a pressure value of the third cement slurry in the third container in the weight loss process;
a second channeling measurement module for applying channeling measurement pressure to the fourth cement slurry in the fourth container, wherein the channeling measurement pressure Pc2＝Pa2*(n2+1) of said Pa2Is the initial pressure value of the third cement paste in the weight loss process, n2Is the second voltage doubling value;
the second duration acquisition module is used for acquiring a second duration between the moment of applying the channeling pressure to the moment of generating the gas channeling by using fourth cement slurry in the fourth container;
a second pressure obtaining module, configured to obtain a pressure p of the third cement slurry in the third container when the time duration elapses3；
A second differential pressure value obtaining module, configured to obtain a differential pressure value according to a differential pressure formula, where the differential pressure formula includes:
ΔPn＝(Pa2-P3)*(n2+1), said Δ PnIs the second differential pressure value;
and the second determining module is used for determining the gas channeling prevention capacity of the second target cement slurry at the second pressure doubling value according to the second pressure difference value.
8. The apparatus of claim 7, further comprising a comparison module for comparing the first time duration and the second time duration when the first voltage doubling value is equal to the second voltage doubling value, the shorter of the first time duration and the second time duration corresponding to the cement slurry having poor gas channeling prevention performance;
when the difference value between the first time length and the second time length is less than or equal to 15 minutes, comparing the first pressure difference value delta PmAnd said second differential pressure value Δ PnSaid first differential pressure value Δ PmAnd said second differential pressure value Δ PnThe smaller of the medium size corresponding cement slurries is inferior in gas channeling prevention performance.
9. The apparatus of claim 7, wherein the first differential pressure value obtaining module further comprises:
obtaining the termination pressure of the second cement paste in the second container after the preset time of the second cement paste in the second container at the moment of applying the channeling pressure, wherein the termination pressure P isy1＝p2*(n1+1)；
Obtaining the first pressure differential value according to a third pressure differential equation comprising:
ΔPm＝Pc1-Py1said Δ PmIs the first differential pressure value.
10. The device according to claim 6 or 7, wherein the first voltage doubling value is in a range of 5-10, and the second voltage doubling value is in a range of 5-10.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899889A (en) * | 2021-12-10 | 2022-01-07 | 成都理工大学 | Device and method for monitoring cement paste gel strength of visual retaining wall |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041029Y (en) * | 2007-04-28 | 2008-03-26 | 中国石油集团工程技术研究院 | Oil well cement weight loss and gas-liquid cross flow simulated test device |
| CN107843721A (en) * | 2016-09-19 | 2018-03-27 | 中国石油化工股份有限公司 | A kind of evaluating apparatus of cement slurry weight loss pressure and anti-gas channeling ability |
| CN108104796A (en) * | 2017-11-13 | 2018-06-01 | 中国海洋石油总公司 | Has channeling simulating test device and test method |
| CN109781604A (en) * | 2019-02-20 | 2019-05-21 | 中国海洋石油集团有限公司 | Method is altered in a kind of survey of cement slurry |
| CN110057916A (en) * | 2018-01-19 | 2019-07-26 | 宏峰·毕 | Cement analyzer |
-
2019
- 2019-12-23 CN CN201911340996.XA patent/CN113092740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041029Y (en) * | 2007-04-28 | 2008-03-26 | 中国石油集团工程技术研究院 | Oil well cement weight loss and gas-liquid cross flow simulated test device |
| CN107843721A (en) * | 2016-09-19 | 2018-03-27 | 中国石油化工股份有限公司 | A kind of evaluating apparatus of cement slurry weight loss pressure and anti-gas channeling ability |
| CN108104796A (en) * | 2017-11-13 | 2018-06-01 | 中国海洋石油总公司 | Has channeling simulating test device and test method |
| CN110057916A (en) * | 2018-01-19 | 2019-07-26 | 宏峰·毕 | Cement analyzer |
| CN109781604A (en) * | 2019-02-20 | 2019-05-21 | 中国海洋石油集团有限公司 | Method is altered in a kind of survey of cement slurry |
Non-Patent Citations (2)
| Title |
|---|
| 滕学清: "多功能防窜水泥浆体系研究与应用", 《西南石油大学学报（自然科学版）》 * |
| 罗宇维 等: "水泥浆防气窜能力评价仪的研制与应用", 《中国海上油气》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899889A (en) * | 2021-12-10 | 2022-01-07 | 成都理工大学 | Device and method for monitoring cement paste gel strength of visual retaining wall |
| CN113899889B (en) * | 2021-12-10 | 2022-04-15 | 成都理工大学 | Device and method for monitoring cement paste gel strength of visual retaining wall |
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