Visual indoor simulation experiment device for annulus gravel packing of water-control sand-control screen pipe

Abstract

The invention relates to a visual indoor simulation experiment device for annulus gravel packing of a water control and sand control screen. The visual indoor simulation experiment device comprises an annular flow channel and a circular tube flow channel, a pressure measuring device is arranged at the first end of the annular flow channel, a first flow monitoring device is arranged at the second end of the annular flow channel, and the annular flow channel is used for simulating an annular flowing space between the outside of the screen pipe and the well wall; the first end of the circular pipe flow channel is communicated with the annular flow channel through an arranged water control piece, the second end of the circular pipe flow channel is communicated with the annular flow channel again, the circular pipe flow channel is further provided with a second flow monitoring device, the second flow monitoring device is arranged at the position close to the second end of the circular pipe flow channel, and the circular pipe flow channel is used for simulating a backflow pipe connected with an annular flowing space; and the annular flow channel and the circular tube flow channel are made of transparent materials. The device has the advantages that the real annulus flowing and backflow conditions between the outside of the screen pipe and the well wall can be simulated, and a research means is provided for gravel filling design parameter optimization under the condition of the sand control and water control screen pipe by recording and researching data of volume flow and pressure change.

Description

Technical Field

[0001] The invention relates to the technical field of gravel packing and sand control for petroleum well completion, in particular to a visual water control and sand control screen annulus gravel packing indoor simulation experimental device. Background Art

[0002] At present, gravel packing sand control technology is widely used in the sand control process of horizontal well open hole completion. By filling gravel between the outside of the screen and the well wall, it can play a dual role of supporting the well wall and preventing sand from entering the wellbore after the formation is produced. During the gravel packing operation, after the sand-carrying fluid carries gravel to the bottom of the well, the gravel cannot pass through the bottom sand filter and is filled in the annulus between the screen and the well wall. The sand-carrying fluid passes through the anti-filter screen of the screen and the perforated base pipe into the return pipe and returns to the ground. The structure of the water control and sand control screen is different from that of the sand control screen. The base pipe of the water control and sand control screen is not perforated, but a water control valve is set. After the sand-carrying fluid enters the anti-filter screen, it can only enter the return pipe through the water control valve. Based on the need of water control, the water control and sand prevention screen sets a large additional pressure drop for the flow of clean water. The sand-carrying fluid is generally clean water, which will also produce a large additional pressure drop when passing through the water control valve, resulting in a decrease in the flow rate of the sand-carrying fluid, which seriously affects the quality of gravel packing. In order to improve the quality of gravel packing under the conditions of water control and sand prevention screens, it is necessary to optimize the gravel packing operation parameters, but there has been a lack of effective indoor simulation experimental research methods. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention aims to provide a visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device, comprising:

[0004] An annular flow channel, a pressure measuring device is provided at a first end thereof, and a flow monitoring device is provided at a second end thereof, the annular flow channel being used to simulate an annular flow space between the outside of the screen tube and the well wall;

[0005] A circular tube flow channel, the first end of which is connected to the annular flow channel through a water control member, and the second end is connected to the annular flow channel again. A flow monitoring device 2 is also provided on the circular tube flow channel, and the flow monitoring device 2 is provided at a position close to the second end of the circular tube flow channel. The circular tube flow channel is used to simulate a return pipe connected to the annular flow space;

[0006] The annular flow channel and the circular tube flow channel are both made of transparent materials.

[0007] Furthermore, the pressure measuring device is a pressure gauge, the flow monitoring device 1 is a flow meter, and the flow monitoring device 2 is also a flow meter.

[0008] Furthermore, the first end of the annular flow channel is provided with an inlet, and the second end of the annular flow channel is provided with an outlet.

[0009] Furthermore, the annular flow channel includes at least one section of a water control screen pipe, and the water control screen pipe is connected to the circular pipe flow channel through a water control member.

[0010] Furthermore, the water control component includes a mounting structure, a water control valve component and a filter screen; the mounting structure is a short circular tube, the filter screen and the water control valve component are sequentially arranged in the short circular tube, and the short circular tube is connected to the annular flow channel.

[0011] Furthermore, two ends of the annular flow channel are provided with straightening nipples for straightening the water control screen pipe.

[0012] Furthermore, the inlet and the outlet are both separate components and are connected to the annular flow channel via flange 1.

[0013] Furthermore, the water control member is connected to the annular flow channel via a second flange.

[0014] Furthermore, a second filter screen is provided on the outlet.

[0015] Furthermore, the water control screen pipe is provided with three sections, and the water control components are provided with three sections.

[0016] On the other hand, the present invention also discloses a method for using a visualized water control and sand control screen annulus gravel filling indoor simulation experimental device, which uses any of the above-mentioned visualized water control and sand control screen annulus gravel filling indoor simulation experimental device, and comprises the following steps:

[0017] Step (i), assembling the device, selecting 1-3 water control screen tubes to assemble the annular flow channel and the circular pipe flow channel, and setting 1-3 water control parts accordingly, and installing the pressure detection device and the flow monitoring device;

[0018] Step (ii), data monitoring and recording, continuously inputting sand-carrying fluid into the annular flow channel, observing the filling process of gravel during the flow of the sand-carrying fluid, and recording the pressure value and the sand-carrying fluid flow value, and finally performing data analysis.

[0019] In summary, the beneficial technical effects of the present invention are as follows: the present invention provides a visualization simulation device for the gravel packing process under the condition of on-site water control screen completion, through which the flow process of the sand-carrying fluid carrying gravel and the filling process of the gravel in the annulus outside the screen can be directly observed, the filling pressure and the sand-carrying fluid flow rate in the above two processes can be recorded, the water control characteristics and change laws of different water control valve components can be evaluated, and a theoretical reference can be provided for the optimization design of gravel packing construction parameters under the condition of water control screen completion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment mode and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] In the figure, 1, annular flow channel, 2, circular pipe flow channel, 3, water control part, 4, righting nipple, 5, flange 1, 6, flange 2, 7, pressure measuring device (pressure gauge), 8, flow monitoring device 1 (flow meter), 9, flow monitoring device 2 (flow meter);

[0023] 11. Inlet, 12. Outlet, 13. Filter screen 2, 31. Mounting structure, 32. Water control valve, 33. Filter screen 1. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] Reference Figure 1 As shown, a visualized water control and sand prevention screen annulus gravel filling indoor simulation experimental device disclosed in the present invention comprises an annular flow channel 1 and a circular pipe flow channel 2; a pressure measuring device 7 is provided at the first end of the annular flow channel 1, and a flow monitoring device 8 is provided at the second end, and the annular flow channel 1 is used to simulate the annular flow space between the outside of the screen and the well wall; the first end of the circular pipe flow channel 2 is connected to the annular flow channel 1 through a water control member 3, and the second end is connected to the annular flow channel 1 again, and a flow monitoring device 9 is also provided on the circular pipe flow channel 2, and the flow monitoring device 9 is provided at a position close to the second end of the circular pipe flow channel 2, and the circular pipe flow channel 2 is used to simulate the return pipe connected to the annular flow space; the annular flow channel 1 and the circular pipe flow channel 2 are both made of transparent materials.

[0026] It should be understood that, in the present embodiment, an annular flow channel and a circular tube flow channel are provided, and the flow area ratio of the two flow channels is set to be the same as the area ratio of the downhole gravel filling flow channel. The annular flow channel simulates the annular flow between the outside of the screen and the well wall, and the circular tube flow channel simulates the return pipe led out from the annulus. When the sand-carrying fluid enters the circular tube flow channel, the annular flow filling condition of the gravel between the outside of the screen and the well wall can be simulated. By means of the provided pressure measuring device and flow monitoring device, the volume flow rate and pressure changes during the filling process can be studied, and their changing laws can be recorded, so as to provide a research means for optimizing the design parameters of gravel filling under the conditions of the sand and water control screen. At the same time, since the materials of the experimental device are all transparent materials, it is convenient to observe the real flow state of gravel in the sand-carrying fluid.

[0027] In this embodiment, preferably, the pressure measuring device 7 is a pressure gauge, the flow monitoring device 1 8 is a flow meter, and the flow monitoring device 2 9 is also a flow meter.

[0028] Continue to refer to Figure 1 As shown, the first end of the annular flow channel 1 is provided with an inlet 11, and the second end is provided with an outlet 12.

[0029] In this embodiment, preferably, the annular flow channel 1 includes at least one section of water control screen pipe, and the water control screen pipe is connected to the circular pipe flow channel 2 through a water control member 3 .

[0030] Reference Figure 1 As shown in, in this embodiment, the water control screen pipe is provided with three sections, the water control parts 3 are provided with three sections, the three sections of the water control screen pipe are arranged in series, each section of the water control screen pipe is connected to a corresponding water control part 3, and is connected to the circular pipe flow channel 2 (that is, the return pipe connected to the annular space).

[0031] Reference Figure 1 As shown, the water control member 3 includes a mounting structure 31, a water control valve member 32 and a filter screen 33; the mounting structure 31 is a short circular tube, the filter screen 33 and the water control valve member 32 are sequentially arranged in the short circular tube, and the short circular tube is connected to the annular flow channel 1. In this embodiment, a water control valve mounting structure is arranged between the annular flow channel and the circular tube flow channel for installing the water control valve, a filter screen is directly arranged on the water control valve to simulate the influence of the sand control filter screen, and a filter screen is arranged at the outlet of the annular flow channel to prevent gravel from passing through and simulating gravel annulus filling.

[0032] Continue to refer to Figure 1 As shown, both ends of the annular flow channel 1 are further provided with straightening short sections 4 for straightening the water control screen pipe, which can simulate the centering degree of the annular flow channel 1 outside the screen pipe.

[0033] Reference Figure 1As shown, the inlet 11 and the outlet 12 are both separate components and are connected to the annular flow channel via a flange 5. It should be understood that during the flow of the sand-carrying fluid, the gravel starts to fill from the outlet 12 of the annular flow channel 1 until the gravel filling completely reaches the inlet 11 position and the filling experiment ends.

[0034] Reference Figure 1 As shown, the water control member 3 is connected to the annular flow channel 1 via a flange 6. The flange connection adopted in this embodiment makes the water control member easy to disassemble and install, and the flange operation is convenient and the connection is reliable.

[0035] In this embodiment, all components are made of transparent materials, so that the whole process of the sand-carrying liquid carrying gravel, the gravel filling process at the outlet, the annular space resistance rising, the sand-carrying liquid passing through the filter screen and the water control valve and then entering the return pipe can be observed intuitively.

[0036] Continue to refer to Figure 1 As shown, a second filter screen 13 is also provided on the outlet 12 .

[0037] Another embodiment of the present invention discloses a method for using a visualized water control and sand control screen annulus gravel packing indoor simulation experimental device, which uses any of the above-mentioned visualized water control and sand control screen annulus gravel packing indoor simulation experimental devices, and comprises the following steps:

[0038] Step (i), assembling the device, selecting 1-3 water control screen tubes to assemble the annular flow channel and the circular pipe flow channel, and setting 1-3 water control parts accordingly, and installing the pressure detection device and the flow monitoring device;

[0039] Step (ii), data monitoring and recording, continuously inputting sand-carrying fluid into the annular flow channel, observing the filling process of gravel during the flow of the sand-carrying fluid, and recording the pressure value and the sand-carrying fluid flow value, and finally performing data analysis.

[0040] In a preferred embodiment of the present invention, a simulation experiment is carried out using the visualized water control and sand prevention screen annulus gravel filling indoor simulation experiment device disclosed in the present invention, and three groups of experiments are carried out using 1 water control screen, 2 water control screens, and 3 water control screens in sequence; the experimental process includes two processes: the flow of sand-carrying fluid carrying gravel and the flow of gravel filling. The sand-carrying fluid carries gravel into the annular flow channel 1 from the inlet 11 and flows. When it reaches the water control valve installation structure 31, part of the sand-carrying fluid will enter the water control valve 32 and flow in the circular pipe flow channel 2, and most of the sand-carrying fluid continues to flow along the annular flow channel 1 carrying gravel toward the outlet 12. During this process, the readings of the pressure gauge 7 and the flow meters 8 and 9 can be recorded respectively to analyze the relationship between the sand-carrying fluid flow rate and the flow resistance; when the sand-carrying fluid reaches the outlet 12, the gravel encounters The filter screen 33 stops and fills the annular flow channel 1. As the flow proceeds, the length of the gravel filling increases continuously. The readings of the pressure gauge 7 and the flow meters 8 and 9 are continuously observed and recorded. The gravel filling position reaches the installation position of the water control valve 32 in turn, until the gravel filling completely reaches the inlet 11 position and the experiment ends. Based on the above experimental process, the flow process of the sand-carrying fluid carrying gravel in the annulus and the filling process of the gravel in the annulus can be directly observed through the transparent annular flow channel 1 and the valve installation structure 31. The flow and pressure change laws of the annular gravel flow and filling process under the water control and sand prevention screen pipe conditions can also be analyzed through the recorded readings of the pressure gauge 7, flow meters 8 and 9, providing a theoretical reference for the optimization design of construction parameters of the on-site gravel filling experiment; and the following experimental data (as shown in reference mark 1) are obtained:

[0041] Table 1 Measurement parameters of gravel packing experiment under water control valve conditions

[0042]

[0043] It can be seen that through the device and experimental method of the invention, on the one hand, it is possible to intuitively observe the true state of the gravel flow driven by the sand-carrying liquid in the circulating flow channel and the circular tube flow channel, and on the other hand, it is possible to collect data such as pressure flow, which is convenient for analyzing its changing laws through data, and providing a theoretical reference for the optimization design of gravel filling construction parameters under the conditions of water control screen completion.

[0044] In summary, the beneficial technical effects of the present invention are as follows: the present invention provides a visualization simulation device for the gravel packing process under the condition of on-site water control screen completion, through which the flow process of the sand-carrying fluid carrying gravel and the filling process of the gravel in the annulus outside the screen can be directly observed, the filling pressure and the sand-carrying fluid flow rate in the above two processes can be recorded, the water control characteristics and change laws of different water control valve components can be evaluated, and a theoretical reference can be provided for the optimization design of gravel packing construction parameters under the condition of water control screen completion.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0046] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device, characterized in that: include: An annular flow channel, a pressure measuring device is provided at a first end thereof, and a flow monitoring device is provided at a second end thereof, the annular flow channel being used to simulate an annular flow space between the outside of the screen tube and the well wall; A circular tube flow channel, the first end of which is connected to the annular flow channel through a water control member, and the second end is connected to the annular flow channel again. A flow monitoring device 2 is also provided on the circular tube flow channel, and the flow monitoring device 2 is provided at a position close to the second end of the circular tube flow channel. The circular tube flow channel is used to simulate a return pipe connected to the annular flow space; The annular flow channel and the circular tube flow channel are both made of transparent materials.

2. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 1 is characterized by: The first end of the annular flow channel is provided with an inlet, and the second end is provided with an outlet.

3. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 1 is characterized by: The annular flow channel includes at least one section of water control screen pipe, and the water control screen pipe is connected to the circular pipe flow channel through a water control member.

4. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to any one of claim 1, characterized in that: The water control component includes a mounting structure, a water control valve component and a filter screen; the mounting structure is a short circular tube, the filter screen and the water control valve component are sequentially arranged in the short circular tube, and the short circular tube is connected to the annular flow channel.

5. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 3 is characterized by: Both ends of the annular flow channel are also provided with straightening short sections for straightening the water control screen pipe.

6. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 2 is characterized by: The inlet and the outlet are both separate components and are connected to the annular flow channel via flange 1.

7. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 1 is characterized by: The water control component is connected to the annular flow channel via a second flange.

8. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 1 is characterized by: A second filter screen is also arranged on the outlet.

9. The visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device according to claim 3 is characterized by: The water control screen pipe is provided with three sections, and the water control components are provided with three sections.

10. A method for using a visual water control and sand prevention screen annulus gravel filling indoor simulation experimental device, characterized in that: The indoor simulation experimental device for gravel filling in the annulus of a visualized water control and sand prevention screen pipe according to any one of claims 1 to 9 is applied, and comprises the following steps: Step (i), assembling the device, selecting 1-3 water control screen tubes to assemble the annular flow channel and the circular pipe flow channel, and setting 1-3 water control parts accordingly, and installing the pressure detection device and the flow monitoring device; Step (ii), data monitoring and recording, continuously inputting sand-carrying fluid into the annular flow channel, observing the filling process of gravel during the flow of the sand-carrying fluid, and recording the pressure value and the sand-carrying fluid flow value, and finally performing data analysis.

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