Method and device for measuring liquid holdup of horizontal well

Abstract

The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a horizontal well liquid holdup measuring method and device. According to the method for measuring the liquid holdup of the horizontal well, the liquid holdup of the horizontal well is measured by measuring the temperature distribution of the cross section of the horizontal well. A gas-liquid interface is found through cross section temperature distribution of the horizontal well, and then the liquid holdup of the horizontal well is measured. A plurality of temperature probes are evenly arranged on the cross section of the horizontal well in the height direction, and therefore cross section temperature distribution of the horizontal well is measured. The temperature difference between the adjacent temperature probes is calculated, and the gas-liquid interface is located between the two adjacent temperature probes with the maximum temperature difference.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas exploitation, and particularly relates to a horizontal well liquid holdup rate measuring method and a horizontal well liquid holdup rate measuring device. BACKGROUND

[0002] The horizontal well staged fracturing process has become the most important development means, and the horizontal well production profile test plays an important supporting role in the fracturing process effect evaluation, reservoir geological understanding, development plan compilation and adjustment.

[0003] The horizontal well production profile test method has been applied on a large scale in the field, and currently an array resistance is used to calculate the liquid holdup rate of the horizontal well, and the present application provides a horizontal well liquid holdup rate measuring method based on an array temperature, which can accurately obtain the liquid holdup rate of the horizontal section and provide technical support for the later horizontal well production profile interpretation. SUMMARY

[0004] In view of the above technical problems, the present application aims to provide a horizontal well liquid holdup rate measuring method which can measure the liquid holdup rate of the horizontal well.

[0005] The present application also provides a horizontal well liquid holdup rate measuring device which can measure the liquid holdup rate of the horizontal well.

[0006] According to the present application, a horizontal well liquid holdup rate measuring method is provided, which measures the liquid holdup rate of the horizontal well by measuring the cross-sectional temperature distribution of the horizontal well.

[0007] In a specific embodiment, the gas-liquid interface is found through the cross-sectional temperature distribution of the horizontal well, and the liquid holdup rate of the horizontal well is measured.

[0008] In a specific embodiment, a plurality of temperature probes are uniformly arranged along the height direction of the cross section of the horizontal well, so as to measure the cross-sectional temperature distribution of the horizontal well.

[0009] In a specific embodiment, the temperature difference between adjacent temperature probes is calculated, and the gas-liquid interface is located between the two adjacent temperature probes with the largest temperature difference.

[0010] According to the present application, a horizontal well liquid holdup rate measuring device for implementing the horizontal well liquid holdup rate measuring method provided by the present application is also provided, which comprises a running tool and a temperature array short section coaxially connected to each other, and a plurality of temperature probes are uniformly arranged on the end face of the temperature array short section along the height direction.

[0011] In a specific embodiment, a straight line formed by the plurality of temperature probes passes through the center of the end face of the temperature array short section.

[0012] In one specific embodiment, the distance between two adjacent temperature probes is no more than 5 cm.

[0013] In one specific embodiment, the horizontal well liquid holdup measurement device further comprises a positioning pup joint coaxially arranged on the running tool, and the positioning pup joint is located upstream of the temperature array pup joint.

[0014] In one specific embodiment, the horizontal well liquid holdup measurement device further comprises a pressure temperature pup joint coaxially arranged on the running tool, and the pressure temperature pup joint is located upstream of the temperature array pup joint.

[0015] In one specific embodiment, the rear end of the temperature array pup joint is larger in size than the front end, and the temperature probes are arranged at the rear end of the temperature array pup joint.

[0016] Compared with the prior art, the application has the following advantages.

[0017] The application adopts the method of temperature array, finds the gas-liquid interface by measuring the change of the horizontal well cross-section temperature in height, and then calculates the horizontal well liquid holdup, so as to realize the quantitative interpretation of gas production and water production.

[0018] The horizontal well liquid holdup measurement device of the application further comprises a pressure temperature pup joint, which can measure the pressure in the horizontal well, and comprehensively applies the parameters of liquid holdup, temperature and pressure, so as to improve the interpretation accuracy of the production profile.

[0019] The application can determine the gas-liquid interface by analyzing the horizontal well cross-section temperature distribution, and is helpful for the judgment of flow state by monitoring the height of the liquid level in the horizontal section. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be described below with reference to the drawings.

[0021] Figure 1 A schematic view of one embodiment of the horizontal well liquid holdup measurement device according to the application is shown;

[0022] Figure 2 A cross-sectional schematic view of the temperature array pup joint in the horizontal well liquid holdup measurement device according to the application in the wellbore is shown;

[0023] Figure 3 A schematic view of the temperature distribution in the wellbore according to the application is shown;

[0024] Figure 4 A schematic view of the horizontal well liquid holdup measurement and calculation method is shown.

[0025] In the drawings:

[0026] 1, wellbore; 2, running tool; 3, perforation; 4, positioning nipple; 5, pressure-temperature nipple; 6, temperature array nipple; 7, temperature probe; 8, liquid phase; 9, gas-liquid interface; 100, horizontal well liquid holdup measurement device.

[0027] In the present application, all the drawings are schematic drawings for illustrating the principles of the present application only and are not drawn to scale. DETAILED DESCRIPTION

[0028] The present application will be described below with reference to the drawings.

[0029] It should be noted that in the present application, the direction close to the wellhead after the horizontal well liquid holdup measurement device according to the present application is run into the well is described as "upstream", "front" or similar terms, and the direction away from the wellhead is described as "downstream", "rear" or similar terms.

[0030] In the present application, the "height direction" refers to the up-down direction in Figure 1 .

[0031] Figure 1 The structure of the horizontal well liquid holdup measurement device 100 according to the present application is shown. As shown in Figure 1 , the horizontal well liquid holdup measurement device 100 comprises a running tool 2 and a temperature array nipple 6 coaxially connected to each other, and a plurality of temperature probes 7 are uniformly arranged on the end face of the temperature array nipple 6 along the height direction.

[0032] When it is necessary to measure the liquid holdup of the horizontal well, the temperature array nipple 6 is run into the horizontal well by the running tool 2, and the plurality of temperature probes 7 are arranged along the height direction in the horizontal well, so that the temperature distribution of the cross section of the horizontal well can be measured by the temperature probes 7. There is a significant temperature jump at the gas-liquid interface, and the temperature difference of the adjacent two temperature probes 7 is calculated, and the two probes 7 with the largest temperature difference are the gas-liquid interface. After the gas-liquid interface is found, the liquid phase area of the cross section in the horizontal well is calculated, and finally the horizontal well liquid holdup is obtained.

[0033] In a specific embodiment, the running tool 2 comprises a coiled tubing, and the temperature array nipple 6 is arranged at the rear end of the coiled tubing, and the coiled tubing can run the temperature array nipple 6 into the horizontal well.

[0034] In a specific embodiment, the running tool 2 can also be arranged to comprise a cable and a crawling device, and the temperature array nipple 6 is arranged at the rear end of the crawling device, and the crawling device can run the temperature array nipple 6 into the horizontal well, and the specific structure of the cable and the crawling device is well known to those skilled in the art, and will not be described here.

[0035] In a specific embodiment, the plurality of temperature probes 7 are uniformly arranged on the rear end surface of the temperature array short section 6 along the height direction, and a straight line formed by the plurality of temperature probes 7 passes through the center of the end surface of the temperature array short section 6.

[0036] In a preferred embodiment, the distance between two adjacent temperature probes 7 is not greater than 5 cm.

[0037] According to the present application, the horizontal well liquid holdup measurement device 100 further comprises a positioning short section 4 coaxially arranged on the running tool 2, and the positioning short section 4 is located upstream of the temperature array short section 6.

[0038] In a specific embodiment, the positioning short section 4 adopts CCL magnetic positioning, and the horizontal well liquid holdup measurement device 100 is positioned in the horizontal well.

[0039] According to the present application, the horizontal well liquid holdup measurement device 100 further comprises a pressure temperature short section 5 coaxially arranged on the running tool 2, and the pressure temperature short section 5 is located upstream of the temperature array short section 6. Further, the pressure temperature short section 5 is arranged between the positioning short section 4 and the temperature array short section 6. The pressure temperature short section 5 obtains pressure temperature data of the horizontal well.

[0040] In a preferred embodiment, the rear end of the temperature array short section 6 is larger in size than the front end. The plurality of temperature probes 7 are uniformly arranged on the rear end surface of the temperature array short section 6 along the height direction, so that the temperature probes 7 can cover the height range of the cross section of the horizontal well as much as possible.

[0041] According to the present application, a horizontal well liquid holdup measurement method is proposed, which measures the liquid holdup of the horizontal well by measuring the cross section temperature distribution of the horizontal well.

[0042] Specifically, the gas-liquid interface is found through the cross section temperature distribution of the horizontal well, and then the liquid holdup of the horizontal well is measured.

[0043] Further, a plurality of temperature probes are uniformly arranged along the height direction of the cross section of the horizontal well, so as to measure the cross section temperature distribution of the horizontal well. The temperature difference between adjacent temperature probes is calculated, and the gas-liquid interface is located between the two adjacent temperature probes with the largest temperature difference.

[0044] The horizontal well liquid holdup measurement method using the horizontal well liquid holdup measurement device 100 according to the present application specifically comprises the following steps:

[0045] S1, well washing, using coiled tubing to pass through the horizontal section, circulating to wash the well, and keeping the horizontal well clean;

[0046] S2, gas well production, controlling the daily gas production fluctuation within 10%;

[0047] S3, running the liquid holdup measurement device 100 into the wellbore 1 of the horizontal well;

[0048] S4, calculating the liquid holdup of the horizontal well according to the data measured by the liquid holdup measurement device 100.

[0049] In S4, the liquid holdup is calculated by the positioning of the positioning nipple 4 of the liquid holdup measurement device 100 and the cross-sectional temperature data of the horizontal well obtained by the temperature array nipple 6.

[0050] In combination Figures 2-4 , the method for calculating the liquid holdup is as follows.

[0051] Laboratory experiments show that the horizontal well presents gas-liquid stratified flow, with liquid in the lower part and gas in the upper part. Since the specific heat of the liquid phase is higher, the temperature of the liquid phase in the horizontal well is higher than that of the gas phase. Therefore, the liquid holdup can be calculated by the temperature distribution of the cross section of the horizontal well.

[0052] The key to calculating the liquid holdup is to find the gas-liquid interface 9. There is a clear temperature jump at the gas-liquid interface 9, and the temperature above and below the gas-liquid interface 9 usually differs by 0.1-0.2℃. Therefore, the temperature at the point where each temperature probe 7 is located is obtained to obtain the cross-sectional temperature distribution in the horizontal well, as shown in Figure 3 The temperature difference between adjacent two temperature probes 7 is calculated, and the gas-liquid interface 9 is located between the two temperature probes 7 with the largest temperature difference.

[0053] In a preferred embodiment, by increasing the number of temperature probes 7 and reducing the spacing between adjacent two temperature probes 7, the accuracy of finding the position of the gas-liquid interface 9 can be improved, thereby improving the accuracy of calculating the liquid holdup.

[0054] The liquid holdup is the proportion of the liquid phase in the volume of the horizontal well, as shown in Figure 4 In a specific embodiment, the liquid holdup is calculated by the following formula.

[0055] θ = L / C*360;

[0056] A = πr 2 ;

[0057] A w = θ / 360*A-r 2 sinθ / 2;

[0058] H L = A w / A.

[0059] In the formula:

[0060] θ is the central angle of the liquid phase (°);

[0061] L is the sector arc length occupied by liquid phase, mm;

[0062] r is the cross-sectional radius of the wellbore 1 of the horizontal well, mm;

[0063] C is the cross-sectional circumference of the wellbore 1 of the horizontal well, mm;

[0064] A is the cross-sectional area of the wellbore 1 of the horizontal well, mm 2 ;

[0065] A w is the cross-sectional liquid phase area of the wellbore 1 of the horizontal well, mm 2 ;

[0066] A is the cross-sectional area of the wellbore 1 of the horizontal well, mm 2 ;

[0067] H L is the liquid holdup.

[0068] According to the present application, as Figure 3 shown, the temperature distribution of the liquid phase and the gas phase in the cross section of the horizontal well can be calculated by interpolation method, and the accuracy of determining the gas-liquid interface 9 is improved. Taking the temperature of point T as an example, T = T1 + (T2-T1) / (H1+H2)*H1. It is easy to understand that the interpolation method used in the calculation process of calculating the temperature distribution in the cross section of the horizontal well by interpolation method is well known to those skilled in the art, and specific reference can be made to the interpolation method used in the prior art for measuring the liquid holdup of the horizontal well by array resistance. Herein, no further description is made.

[0069] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0070] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0072] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for measuring liquid holdup in horizontal wells, characterized in that, The fluid holdup of a horizontal well is measured by measuring the cross-sectional temperature distribution.

2. The method for measuring liquid holdup in horizontal wells according to claim 1, characterized in that, By analyzing the temperature distribution across the cross-section of a horizontal well, the gas-liquid interface can be located, and the liquid holdup of the horizontal well can then be measured.

3. The method for measuring liquid holdup in horizontal wells according to claim 2, characterized in that, Multiple temperature probes are uniformly installed along the height direction of the cross section of the horizontal well to measure the cross-sectional temperature distribution of the horizontal well.

4. The method for measuring liquid holdup in horizontal wells according to claim 3, characterized in that, Calculate the temperature difference between adjacent temperature probes, with the gas-liquid interface located between the two adjacent temperature probes with the largest temperature difference.

5. A horizontal well liquid holdup measuring device for implementing the horizontal well liquid holdup measuring method according to any one of claims 1 to 4, characterized in that, It includes a feeding and discharging tool (2) and a temperature array section (6) that are coaxially connected to each other. Multiple temperature probes (7) are uniformly arranged along the height direction on the end face of the temperature array section (6).

6. The horizontal well liquid holdup measuring device according to claim 5, characterized in that, The straight line formed by the multiple temperature probes (7) passes through the center of the end face of the temperature array section (6).

7. The horizontal well liquid holdup measuring device according to claim 5, characterized in that, The distance between two adjacent temperature probes (7) shall not exceed 5 cm.

8. The horizontal well liquid holdup measuring device according to claim 5, characterized in that, The horizontal well liquid holdup measuring device also includes a positioning sub (4), which is coaxially mounted on the delivery tool (2) and is located upstream of the temperature array sub (6).

9. The horizontal well liquid holdup measuring device according to claim 5, characterized in that, The horizontal well liquid holdup measuring device also includes a pressure-temperature section (5), which is coaxially mounted on the delivery tool (2) and is located upstream of the temperature array section (6).

10. The horizontal well liquid holdup measuring device according to claim 5, characterized in that, The rear end of the temperature array section (6) is larger than the front end, and the temperature probe (7) is located at the rear end of the temperature array section (6).

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