Underground water flow testing device for horizontal well

Abstract

The invention provides a horizontal well underground water flow testing device which comprises an outer pipe, an inner pipe, a measuring module and a stirring module, and the inner pipe, the stirring device and the measuring module are all located in a hollow structure of the outer pipe; a first runner is arranged in the inner pipe, and the stirring device is located on the side where the inlet end of the first runner is located; the measuring module measures the parameters of the stirred liquid and the parameters of the horizontal well environment, and various accurate parameters of the liquid in the horizontal well and the parameters of the horizontal well environment are obtained. Liquid in the horizontal well is stirred and mixed through the stirring device, and the flow pattern of the liquid is reconstructed, so that when the stirred liquid is measured by the measuring device, the measuring result is stable and uniform and is not influenced by the flow pattern of the liquid; meanwhile, when the measuring module is used for measuring, crude oil cakes in the liquid interfere with the measuring result, the stirring device can stir and scatter the crude oil cakes, and the stability of the measuring result of the measuring device is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production engineering, and particularly relates to a downhole water content flow rate testing device for horizontal wells. Background Art

[0002] With the development of society and the increasing global demand for energy, in order to better develop resources, more special drilling technologies are adopted, such as directional wells, horizontal wells, underbalanced drilling, geosteering drilling, gas drilling, etc. At present, with the development of horizontal well production technology, horizontal well production has developed from single horizontal wells to multi-bottom wells, branched wells and other production methods. At the same time, more and more measuring devices are installed downhole to measure the horizontal well environment and parameters, such as the measurement of pressure, temperature, water content, etc. Among them, the horizontal section of a horizontal well refers to the section where the well deviation angle of the wellbore entering the oil and gas layer in the horizontal well is not less than 86 degrees. The productivity of a horizontal well is several times higher than that of a vertical well, which not only saves costs but also greatly improves the production efficiency. The main reason why horizontal wells are superior to vertical wells is that horizontal wells have a horizontal section; and precisely for drilling the horizontal section, the drilling cost of horizontal wells is much higher than that of vertical wells. Therefore, the horizontal section plays a very important role in the design of the entire horizontal well. The length of the horizontal section not only affects the single-well production of the horizontal well, the drilling cost, and the area of oil leakage, but also largely affects the number of wells drilled in the oilfield and the cost of development investment, etc. At the same time, because the horizontal section of the horizontal well crosses the oil layer, it causes some suspended open-hole sections. Especially in the case of lost circulation and well collapse in horizontal wells, water production points often appear in the horizontal section of horizontal wells, thus affecting oil production. Therefore, the horizontal section of horizontal wells has become the target of key monitoring.

[0003] However, it is extremely difficult to obtain various accurate liquid parameters and horizontal well environment parameters in horizontal wells. On the one hand, because the liquid in horizontal wells is mainly composed of a mixture of oil and water, this mixed liquid is called an oil-water two-phase flow liquid; when measuring the horizontal well environment and parameters, the measurement results are affected by the flow pattern of the oil-water two-phase flow liquid; when the measuring device measures different positions of the flow pattern of the oil-water two-phase flow liquid, the measurement results are not the same; at the same time, the downhole environment is complex and changeable, and the flow pattern of the oil-water two-phase flow liquid is difficult to fix, and the measurement results vary greatly; furthermore, when the viscosity of the crude oil is high, the measuring device is prone to sticking oil, resulting in low test accuracy. Summary of the Invention

[0004] In order to solve one or more of the above-mentioned existing problems, the present invention provides a downhole water content flow rate testing device for horizontal wells. The testing device is placed in the horizontal section of the horizontal well to effectively test the parameters of the liquid to be tested downhole in the horizontal well, and the measurement results of the measuring device for the stirred liquid to be tested are more accurate.

[0005] A downhole water cut flow rate testing device for horizontal wells according to the present invention includes an outer pipe with a hollow structure inside, and the hollow structure is connected to the outer pipe. At least one tester is arranged inside the hollow structure, and the tester is used to measure the parameters of the liquid to be tested and / or the environmental parameters in the horizontal section of the horizontal well.

[0006] A further improvement of the present invention lies in that the hollow structure includes a first part, a second part and a third part arranged in sequence.

[0007] The testing device is provided with an inlet. Along the axis direction of the outer pipe, an inner pipe and a stirring device communicated with the inner pipe are arranged inside the hollow structure. The stirring device is located on one side of the inlet and communicated with the inlet. The stirring device is arranged in the first part, and the inner pipe is arranged in the third part. The liquid to be tested flows into the inner pipe after being stirred by the stirring device. The liquid to be tested can flow into the stirring device through the inlet of the testing device for stirring and mixing. After being stirred and mixed, the liquid to be tested can reconstruct the liquid flow pattern, making the test results more stable and not affected by the liquid flow pattern. At the same time, it avoids the crude oil in the liquid to be tested from caking and affecting the measurement results.

[0008] A further improvement of the present invention lies in that one end of the inner pipe is provided with a first flow channel, and the first flow channel is located on one side of the stirring device. The inlet end of the first flow channel is communicated with the stirring device, and the outlet end of the first flow channel is communicated with the inner pipe. The setting of the first flow channel can make the liquid to be tested flow more stably from the stirring device to the inner pipe.

[0009] A further improvement of the present invention lies in that one end of the first flow channel is provided with a second flow channel communicated with the first flow channel. The first flow channel is communicated with the inner pipe through the second flow channel.

[0010] A further improvement of the present invention lies in that a sealed space is formed between the inner wall of the outer pipe and the outer wall of the inner pipe, and the sealed space can be used to place electronic components. At least one tester is arranged in the sealed space.

[0011] A further improvement of the present invention lies in that a first flow guiding member with a flow guiding function is arranged inside the hollow structure, and the first flow guiding member is arranged on one side of the stirring device. The setting of the first flow guiding member can make the liquid to be tested flow more gently from the stirring device to the inner pipe.

[0012] A further improvement of the present invention lies in that a first measurement hole is opened on the pipe wall of the outer pipe, and the first measurement hole communicates the inside and outside of the outer pipe. The first flow guiding member includes a third flow channel communicated with the first measurement hole. The first measurement hole is connected to the sealed space through the third flow channel.

[0013] A further improvement of the present invention lies in that the first flow guiding member includes a fourth flow channel, and the fourth flow channel communicates the second part of the hollow structure with the sealed space. The fourth flow channel can be used as a channel for liquid flow in the first flow guiding member.

[0014] A further improvement of the present invention lies in that a sieve mesh for filtering the liquid to be tested is sleeved outside the stirring device, and a filter hole array is provided on the sieve mesh. The setting of the filter hole array can better filter the impurities in the liquid to be tested.

[0015] A further improvement of the present invention lies in that a first flow channel and a second diversion member are provided in the hollow structure, and the second diversion member includes a fifth flow channel which communicates the hollow structure with the first flow channel. The setting of the second diversion member facilitates the processing and assembly of the downhole testing device for horizontal wells, and forms a sealed space for facilitating the placement and assembly of electronic components.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention provides a downhole water cut flow testing device for horizontal wells, which includes an outer pipe, an inner pipe, a stirring device and a measurement module; during testing: the downhole testing device for horizontal wells is placed in the horizontal section of the horizontal well, and the liquid in the horizontal section of the horizontal well flows in the hollow structure of the outer pipe. The liquid first passes through the stirring device for stirring and then flows into the inner pipe through the first flow channel. Among them, the measurement module measures the parameters of the stirred liquid and the parameters of the horizontal well environment to obtain various accurate liquid parameters in the horizontal well and horizontal well environment parameters. The stirring device stirs and mixes the liquid in the horizontal well, reconstructs the flow pattern of the liquid, so that when the stirred liquid is measured by the measuring device, the measurement result is stable and uniform, and is not affected by the flow pattern of the liquid; at the same time, when the measurement module measures, the caking of crude oil in the liquid interferes with the measurement result, and the stirring device can also stir and break up the caking of crude oil, further improving the stability of the measurement result of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 is the first structural schematic diagram of a downhole water cut flow testing device for horizontal wells provided by the present invention;

[0020] Figure 2 is the second structural schematic diagram of a downhole water cut flow testing device for horizontal wells provided by the present invention;

[0021] Figure 3 is the partial enlarged view of the first diversion member in a downhole water cut flow testing device for horizontal wells provided by the present invention;

[0022] Figure 4 is the partial enlarged view of the sieve mesh in a downhole water cut flow testing device for horizontal wells provided by the present invention.

[0023] Wherein: 100 - outer tube; 101 - hollow structure; 102 - first flow guiding member; 103 - second flow path; 104 - outer inner wall; 105 - second flow guiding member; 106 - fifth flow path; 107 - first measurement hole; 108 - third flow path; 109 - fourth flow path;

[0024] 200 - inner tube; 201 - first flow path; 202 - inner and outer wall;

[0025] 300 - measurement module; 301 - first measuring instrument; 302 - second measuring instrument; 303 - third measuring instrument; 304 - fourth measuring instrument;

[0026] 400 - stirring device; 401 - sieve mesh; 402 - filter hole array; 4011 - first filtering section; 4012 - second filtering section. Detailed implementation manners

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0028] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention.

[0029] The present invention provides a horizontal well downhole water cut flow rate testing device, as Figures 1-4 shown. The device includes an outer tube 100, an inner tube 200, a measurement module 300, and a stirring device 400. As Figure 1 shown, the inner tube 200, the measurement module 300, and the stirring device 400 are all sequentially distributed in the hollow structure 101 inside the outer tube 100. The hollow structure 101 is an internal cavity structure.

[0030] It can be understood that the hollow structure 101 of the outer tube 100 can be sequentially divided into three parts, namely a first part, a second part, and a third part, along the axial direction of the outer tube 100; wherein, the stirring device 400, the first measuring instrument 301 in the measurement module 300, and the inner tube 200 are respectively located in the first part, the second part, and the third part. One end of the inner tube 200 has a first flow path 201 for connecting the stirring device 400 and the inner tube 200.

[0031] As Figure 2As shown in the figure, at the connection between the second part and the third part of the hollow structure 101, there is a first flow guide member 102 with a flow guiding function, which can be a member with a flow guiding structure. The first flow guide member 102 can make the liquid to be tested flow more smoothly when flowing from the second part of the hollow structure 101 into the first flow channel 201. The first flow guide member 102 includes a second flow channel 103. The second flow channel 103 can be a channel for the liquid to flow in the first flow guide member 102, that is, the second flow channel 103 can be used to connect the second part of the hollow structure 101 and the first flow channel 201.

[0032] In some embodiments, the first flow guide member 102, the inner and outer walls 202, and the outer and inner walls 104 can form a sealed space; this sealed space is a sealed and blocked space that is relatively isolated from the outside world. Various electronic components can be placed in the sealed space to adapt to the measurement of various parameters of the oil-water two-phase flow liquid by the measuring device. The inner and outer walls 202 are the outer walls of the inner tube 200, and the outer and inner walls 104 are the inner walls of the outer tube 100.

[0033] As Figure 3 shown, in a specific embodiment, a hole is opened on the tube wall of the outer tube 100, and this hole is the first measurement hole 107. The first measurement hole 107 connects the inner and outer spaces of the tube wall of the outer tube 100. The first flow guide member 102 includes a third flow channel 108 and a fourth flow channel 109; the third flow channel 108 connects the first measurement hole 107 and the sealed space, and the fourth flow channel 109 connects the second part of the hollow structure and the sealed space. The third flow channel 108 and / or the fourth flow channel 109 can be channels for the liquid to flow in the first flow guide member 102.

[0034] Furthermore, a second flow guide member 105 with a flow guiding function is provided in the third part of the hollow structure 101. The second flow guide member 105 includes a fifth flow channel 106. The fifth flow channel 106 can be a channel for the liquid to flow in the second flow guide member 105; the fifth flow channel 106 can be used to connect the first flow channel 201 and the hollow structure 101.

[0035] In some embodiments, under the combined action of the first flow guide member 102 and the second flow guide member 105, a sealed space is formed between the inner and outer walls 202 and the outer and inner walls 104. The setting of the second flow guide member 105 facilitates the implantation and assembly of electronic components in the sealed space.

[0036] Among them, the first measuring instrument 301 of the measuring module 300 is arranged on one side of the stirring device 400. Optionally, the first measuring instrument 301 can be a device for measuring the water content of the liquid, and the specific model can be reasonably selected according to actual application requirements. Furthermore, in view of the influence of the oil-water form and salinity in the well, a water content detector using the microwave detection principle can be selected.

[0037] In some embodiments, the measurement module 300 includes a third measuring instrument 303 disposed in the sealed space. The measuring end of the third measuring instrument 303 communicates with the third flow channel 108. The third measuring instrument 303 can be a device for measuring pressure. The pressure is specifically measured through the measuring end of the third measuring instrument 303; the specific model of the third measuring instrument 303 can be reasonably selected according to actual application requirements. The third flow channel 108 and the first measuring hole 107 can communicate the third measuring instrument 303 with the outside of the outer tube 100. The pressure outside the outer tube 100 can be measured through the measuring end of the third measuring instrument 303. Measuring the pressure outside the tube by the third measuring instrument 303 facilitates the measurement and monitoring of the state outside the tube.

[0038] In some embodiments, the measurement module 300 includes a fourth measuring instrument 304 disposed in the sealed space. The measuring end of the fourth measuring instrument 304 communicates with the fourth flow channel 109. The fourth measuring instrument 304 can be a device for measuring pressure, specifically for measuring the pressure of the second part of the hollow structure 101; its specific model can be reasonably selected according to actual application requirements. Further, it can be a measuring instrument with high seismic resistance, low temperature drift, and capable of synchronizing data with the third measuring instrument 303, such as a titanium / silicon-on-sapphire pressure sensor.

[0039] In some embodiments, the measurement module 300 includes a second measuring instrument 302, and the second measuring instrument 302 is disposed in the inner tube 200. Optionally, the second measuring instrument 302 can be a device for measuring the liquid flow rate, and the specific model can be reasonably selected according to actual application requirements. Further, the second measuring instrument 302 can be a measuring instrument suitable for accurate measurement of downhole multiphase flow, such as a vortex flowmeter.

[0040] In specific implementation, the measurement module 300 can include a temperature measuring device for measuring temperature. The specific types and quantities of the temperature measuring devices are not limited, and can be reasonably selected according to actual application requirements. Further, in order to better detect the environment and the liquid, it can be used at multiple positions of the test device, such as the inner tube 200, the outer tube 100, the stirring device 400, etc.

[0041] In specific implementation, the measurement module 300 includes an energy system for providing power. For example: a high-temperature lithium battery pack.

[0042] In specific implementation, the measurement module 300 includes a storage device for data storage. For example: a storage chip that can store data continuously for more than 30 days under the storage frequency of the measurement module for 24 hours.

[0043] Since the oil-water two-phase flow liquid measured by the test device is a mixture of oil and water, with different densities and immiscibility between oil and water, the liquid is stratified up and down. The stirring device 400 is located on one side of the inlet end of the first flow channel 201. The stirring device 400 is used to stir and mix the liquid to be tested, break the stratification of the liquid, and reconstruct its flowing shape in the outer pipe 100. Specifically, the specific model of the stirring device 400 can be reasonably selected according to actual application requirements.

[0044] As Figure 4 shown, the test device further includes a sieve mesh 401 sleeved outside the stirring device 400, and a filter hole array 402 is provided on the sieve mesh 401. The specific style of the sieve mesh 401 is not limited and can be reasonably selected according to actual application requirements. The filter hole array 402 can make it difficult for impurities and other particulate matters to enter the stirring device 400. The density and shape of the filter holes of the filter hole array 402 can be set according to the actual situation. For the convenience of filter mesh processing, the filter holes of the filter hole array 402 can be semi-circular, square, flat, etc.

[0045] Furthermore, for better filtration, along the axial direction of the outer pipe 100, the sieve mesh 401 includes a connected first filter section 4011 and a second filter section 4012. Optionally, the outer surface of the first filter section 4011 is a convex curved surface, and the outer surface of the second filter section 4012 is cylindrical. Setting the outer surface of the first filter section 4011 as a convex curved surface and the outer surface of the second filter section 4012 as cylindrical facilitates the smooth transition between the two sections of the filter mesh and enables the filter mesh to have a better flow guiding effect; and the cylindrical outer surface of the second filter section 4012 can enhance the filtration effect.

[0046] When the downhole test device for horizontal wells is measuring, it needs to be placed in the horizontal section of the horizontal well. After the liquid in the horizontal section enters the hollow structure 101 of the outer pipe 100, it successively passes through the stirring device 400, the first flow channel 201, and the inner pipe 200. During the flow of the liquid to be tested, the measurement module 300 measures the parameters of the stirred liquid and the parameters of the horizontal well environment, and obtains various accurate liquid parameters in the horizontal well and horizontal well environment parameters. By stirring the liquid in the horizontal well with the stirring device 400, the flow pattern of the liquid is reconstructed, so that when the stirred liquid is measured by the measuring device, the measurement results are stable and uniform, and are not affected by the flow pattern of the liquid; at the same time, when the measurement module 300 is measuring, the agglomerated crude oil in the liquid interferes with the measurement results, and the stirring device 400 can also stir and break up the agglomerated crude oil, further improving the stability of the measurement results of the measuring device.

[0047] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A downhole water cut flow rate testing device for horizontal wells, characterized in that, The test device includes an outer tube, a hollow structure is arranged inside the outer tube, and the hollow structure is connected to the outer tube; at least one tester is arranged inside the hollow structure, and the tester is at least used for measuring the parameters of the liquid to be tested in the horizontal section of the horizontal well.

2. The downhole water cut flow rate testing device for horizontal wells according to claim 1, wherein The hollow structure includes a first part, a second part and a third part which are arranged in sequence along the axis; Along the axis direction of the outer tube, an inner tube and a stirring device communicated with the inner tube are arranged inside the hollow structure; the stirring device is arranged in the first part, and the inner tube is arranged in the third part; the liquid to be tested can flow into the inner tube after being stirred by the stirring device.

3. The downhole water cut flow rate testing device for horizontal wells according to claim 2, wherein, One end of the inner tube is provided with a first flow channel, and the first flow channel is located on one side of the stirring device; the inlet end of the first flow channel is communicated with the stirring device, and the outlet end of the first flow channel is communicated with the inner tube.

4. The downhole water cut flow rate testing device for horizontal wells according to claim 3, wherein One end of the first flow channel is provided with a second flow channel communicated with the first flow channel; the first flow channel is communicated with the inner tube through the second flow channel.

5. The downhole water cut flow rate testing device for horizontal wells according to claim 2, characterized in that, A sealed space is formed between the inner wall of the outer tube and the outer wall of the inner tube, and the sealed space is used for placing electronic components; the tester is arranged in the sealed space.

6. The downhole water cut flow rate testing device for horizontal wells according to claim 5, characterized in that A first flow guiding member with a flow guiding function is arranged inside the hollow structure, and the first flow guiding member is arranged on one side of the stirring device.

7. The downhole water cut flow rate testing device for horizontal wells according to claim 6, wherein, A first measurement hole is formed in the tube wall of the outer tube, and the first measurement hole communicates the inside and outside of the outer tube; the first flow guiding member includes a third flow channel communicated with the first measurement hole; the first measurement hole is connected to the sealed space through the third flow channel.

8. The downhole water cut flow testing device for horizontal wells according to claim 5, characterized in that, The first flow guiding member includes a fourth flow channel, and the fourth flow channel communicates the second part of the hollow structure with the sealed space.

9. The downhole water cut flow rate testing device for horizontal wells according to claim 2, wherein, A sieve mesh for filtering the liquid to be tested is sleeved outside the stirring device, and an array of filtering holes is arranged on the sieve mesh.

10. The downhole water cut flow test device for horizontal wells according to claim 1, characterized in that A first flow channel and a second flow guiding member are arranged inside the hollow structure, the second flow guiding member includes a fifth flow channel, and the fifth flow channel communicates the hollow structure with the first flow channel.

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