Geothermal well high-temperature foam drilling fluid circulation testing device

Abstract

The utility model relates to the technical field of drilling fluid detection devices, in particular to a geothermal well high-temperature foam drilling fluid circulation testing device which comprises a testing piece, a heating piece and a liquid storage barrel, the testing piece comprises a simulation barrel, the upper end and the lower end of the simulation barrel are open, and internal threads are formed in the bottom of the inner circumferential face of the simulation barrel. A screw cap is assembled at the bottom end of the simulation barrel in a threaded mode, a rock core is vertically supported on the top face of the screw cap, the bottom end of the screw cap is vertically communicated and fixed with a liquid drainage barrel, a plurality of sampling pipes are horizontally arranged on the outer circumferential face of the liquid drainage barrel in the vertical direction, the heating piece comprises a liquid storage barrel, and the simulation barrel is sleeved with the liquid storage barrel. The utility model overcomes the defects that when the high-temperature foam drilling fluid in the existing geothermal well is detected, the detection device lacks a heating structure, the temperature of the introduced warm foam drilling fluid cannot be adjusted according to the actual drilling temperature, and the parameter adjustability of the detection of the warm foam drilling fluid is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling fluid detection devices, and particularly relates to a test device for circulating high-temperature foam drilling fluid in a geothermal well. Background Technique

[0002] In the development process of geothermal reservoirs with developed karst fissures, there is a contradiction between plugging during drilling and unplugging after drilling. In addition, low pressure and serious leakage increase the drilling risk and the time cost of drilling, which is not conducive to the efficient development of geothermal resources. Ultra-high temperature foam fluid can better play the role of leak prevention and plugging and establish an underbalanced condition under low pressure. The key problem is the temperature resistance of the drilling fluid.

[0003] There is a prior art with the publication number CN213023069U and the name of a drilling fluid performance test device, which includes a bottom plate. A bracket and a mud return box are vertically arranged upward at the top of the bottom plate. The brackets are symmetrically distributed with respect to the bottom plate, and a frame is arranged between the tops of the two brackets. A motor is arranged at the top of the frame. An installation groove is formed in the middle of the frame, and a first pulley and a second pulley are arranged in the installation groove. The output shaft of the motor extends vertically downward into the installation groove and is fixedly sleeved with the second pulley. A drilling shaft, a simulation barrel and a hydraulic cylinder are arranged between the two brackets. The top of the drilling shaft is rotatably connected to the frame, and a drill bit is arranged at the bottom of the drilling shaft. The top of the drilling shaft is fixedly sleeved with the first pulley, and a belt is matched and sleeved between the first pulley and the second pulley. A mud pump is arranged at the top of the mud return box. The drill bit is driven by the motor and the hydraulic cylinder to drill the simulated core, and is combined with the mud pump, the mud return box, the return pipe, etc. to carry out drilling simulation, so as to obtain relevant mud samples and drill bit wear data, making the test results in the laboratory closer to the actual situation of drilling operations.

[0004] However, when detecting the high-temperature foam drilling fluid in the above geothermal well, the detection device lacks a heating structure and cannot adjust the temperature of the introduced warm foam drilling fluid according to the actual drilling temperature, which affects the adjustable parameters of the detection of the warm foam drilling fluid. Summary of the Utility Model

[0005] The utility model solves the problems in the related technologies and provides a test device for circulating high-temperature foam drilling fluid in a geothermal well, which simulates the drilling fluid at different temperatures during drilling and tests the parameters of the drilling fluid.

[0006] To solve the above technical problems, the present utility model is realized through the following technical solutions: A testing device for the circulation of high-temperature foam drilling fluid in a geothermal well, comprising a test piece, a heating piece, and a liquid storage barrel. The test piece includes a simulation barrel, both the upper and lower ends of the simulation barrel are open, and internal threads are provided at the bottom of the inner circumferential surface of the simulation barrel. A screw cap is assembled by threading at the bottom end of the simulation barrel, and a core is vertically supported on the top surface of the screw cap. A drain tube is vertically and fixedly connected to the bottom end of the screw cap, and multiple sampling tubes are horizontally opened along the vertical direction on the outer circumferential surface of the drain tube. The heating piece includes a liquid storage barrel, the liquid storage barrel is sleeved outside the simulation barrel, and multiple heating rods are vertically fixed inside the liquid storage barrel. A pressing cover is vertically and slidably assembled at the open end of the top of the simulation barrel. The liquid storage barrel is arranged on one side of the simulation barrel, and liquid guide tubes are fixedly connected to both the upper and lower ends of the liquid storage barrel. The liquid guide tube at the bottom of the liquid storage barrel is fixedly connected to the drain tube, and the liquid guide tube at the top of the liquid storage barrel is fixedly connected to the pressing cover. Mud pumps are assembled and connected to the liquid guide tubes at both the upper and lower ends of the liquid storage barrel.

[0007] As a preferred solution, a motor is vertically fixed on the top surface of the pressing cover, a drill bit is vertically rotatably connected to the bottom surface of the pressing cover, and the top surface of the drill bit is fixedly connected to the output end of the motor.

[0008] As a preferred solution, a hole rack is horizontally fixed on the outer wall of the simulation barrel, and a lifting rod rack is vertically slidably assembled on the hole rack.

[0009] As a preferred solution, a hydraulic rod is vertically fixed on the top surface of the hole rack, and the output end of the hydraulic rod is fixed on the lifting rod rack.

[0010] As a preferred solution, a pressing column is vertically fixed on the top of the lifting rod rack, and the bottom end of the pressing column is fixed on the top surface of the pressing cover.

[0011] As a preferred solution, a heat insulation pad is sleeved on the outer wall of the liquid storage barrel.

[0012] As a preferred solution, a support is vertically fixed at the bottom of the outer circumferential surface of the simulation barrel, and a fixing screw is vertically threaded through and assembled at the bottom end of the support.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the use of the present utility model, drilling fluid is added to the liquid storage barrel, then the core is inserted into the interior of the simulation barrel, and then the screw cap is threadedly assembled at the bottom end of the simulation barrel. The gland is inserted into the simulation barrel, and drilling of the core is started. The mud pump at the top end of the liquid storage barrel is started to drive the drilling fluid to flow into the simulation barrel. During drilling, the drilling fluid is used to cool the drill bit. At the same time, the temperature of the heating rod in the heating element and the temperature of the heating oil in the liquid storage cylinder are adjusted according to requirements, so as to heat the internal drilling fluid. After drilling is completed, the drilling fluid flows downward into the drainage cylinder, and the valve on the sampling pipe is opened to collect the drilling fluid for testing. Then, the mud pump at the top end of the liquid storage barrel is started to drive the drilling fluid to flow back into the liquid storage barrel, so as to simulate the drilling fluid at different temperatures during drilling and test the parameters of the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is the exploded structural schematic diagram of the present utility model;

[0016] Figure 3 is the structural schematic diagram of the test piece in the exploded state in the embodiment of the present utility model;

[0017] Figure 4 is the structural schematic diagram of the heating element in the exploded state in the embodiment of the present utility model;

[0018] Figure 5 is the structural schematic diagram of the liquid storage barrel in the exploded state in the embodiment of the present utility model.

[0019] In the figure: 1. Test piece; 11. Simulation barrel; 111. Bracket; 112. Fixed screw; 12. Hole frame; 13. Lifting rod frame; 131. Pressure column; 14. Hydraulic rod; 15. Screw cap; 151. Drainage cylinder; 152. Sampling pipe; 16. Core; 2. Heating element; 21. Liquid storage cylinder; 22. Heat insulation pad; 23. Heating rod; 3. Liquid storage barrel; 31. Liquid guide pipe; 32. Mud pump; 33. Gland; 34. Motor; 35. Drill bit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0024] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the spatial positional relationship of a device or feature shown in the figures with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here will be made accordingly.

[0025] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0026] Such as Figures 1 to 5As shown, a test device for the circulation of a high-temperature foam drilling fluid in a geothermal well includes a test piece 1, a heating piece 2, and a liquid storage barrel 3. The test piece 1 includes a simulation barrel 11 with both the upper and lower ends open. The bottom of the inner circumferential surface of the simulation barrel 11 is provided with internal threads. A screw cap 15 is threadedly assembled at the bottom end of the simulation barrel 11, and a core 16 is vertically supported on the top surface of the screw cap 15. A drain cylinder 151 is vertically and fixedly connected to the bottom end of the screw cap 15, and a plurality of sampling tubes 152 are horizontally opened along the vertical direction on the outer circumferential surface of the drain cylinder 151. The heating piece 2 includes a liquid storage cylinder 21 sleeved outside the simulation barrel 11, and a plurality of heating rods 23 are vertically fixed inside the liquid storage cylinder 21. A gland 33 is vertically slidably assembled at the open top end of the simulation barrel 11. The liquid storage barrel 3 is arranged on one side of the simulation barrel 11, and liquid guide pipes 31 are fixedly connected to both the upper and lower ends of the liquid storage barrel 3. The bottom liquid guide pipe 31 of the liquid storage barrel 3 is fixedly connected to the drain cylinder 151, and the top liquid guide pipe 31 of the liquid storage barrel 3 is fixedly connected to the gland 33. Mud pumps 32 are assembled and connected to the liquid guide pipes 31 at both the upper and lower ends of the liquid storage barrel 3. During use, the drilling fluid is filled into the liquid storage barrel 3, then the core 16 is inserted into the interior of the simulation barrel 11, then the screw cap 15 is threadedly assembled at the bottom end of the simulation barrel 11, and the gland 33 is inserted into the simulation barrel 11. Drilling starts on the core 16. The mud pump 32 at the top liquid guide pipe 31 of the liquid storage barrel 3 is started to drive the drilling fluid to flow into the simulation barrel 11. During drilling, the drilling fluid is used to cool the drill bit 35, and at the same time, the temperature of the heating rods 23 in the heating piece 2, that is, the temperature of the heating oil in the liquid storage cylinder 21, is adjusted according to requirements to heat the internal drilling fluid. After drilling is completed, the drilling fluid flows downward into the drain cylinder 151, and the valve on the sampling tube 152 is opened to collect the drilling fluid for detection. Then the mud pump 32 at the top liquid guide pipe 31 of the liquid storage barrel 3 is started to drive the drilling fluid to flow back into the liquid storage barrel 3, so as to simulate the drilling fluid at different temperatures during drilling and test the parameters of the drilling fluid.

[0027] In one embodiment, as Figure 3 and 5 shown, a motor 34 is vertically fixed on the top surface of the gland 33, a drill bit 35 is vertically rotatably connected to the bottom surface of the gland 33, and the top surface of the drill bit 35 is fixedly connected to the output end of the motor 34. A hole frame 12 is horizontally fixed on the outer wall of the simulation barrel 11, and a lifting rod frame 13 is vertically slidably assembled on the hole frame 12. A hydraulic rod 14 is vertically fixed on the top surface of the hole frame 12, and the output end of the hydraulic rod 14 is fixed on the lifting rod frame 13. A pressure column 131 is vertically fixed on the top of the lifting rod frame 13, and the bottom end of the pressure column 131 is fixed on the top surface of the gland 33. During use, the motor 34 is started to drive the drill bit 35 to rotate, and drilling starts on the core 16. The hydraulic rod 14 is started to extend and pull the lifting rod frame 13 to vertically slide on the hole frame 12, driving the gland 33 to be inserted into the interior of the simulation barrel 11 to drill downward vertically on the core 16.

[0028] In one embodiment, as Figure 3 shown, a heat preservation pad 22 is sleeved on the outer wall of the liquid storage cylinder 21. The heat preservation pad 22 is used to prevent the heat in the liquid storage cylinder 21 from being discharged. A bracket 111 is vertically fixed at the bottom of the outer circumferential surface of the simulation barrel 11, and a fixing screw 112 is vertically threaded through and assembled at the bottom end of the bracket 111. The bracket 111 is fixed by the fixing screw 112 on the bracket 111. The bracket 111 is used to carry and support the simulation barrel 11 to keep it stable.

[0029] In this embodiment, during use, drilling fluid is filled into the liquid storage barrel 3, then the core 16 is inserted into the interior of the simulation barrel 11, and then the screw cap 15 is threadedly assembled at the bottom end of the simulation barrel 11. The gland 33 is inserted into the simulation barrel 11, and drilling of the core 16 is started. The mud pump 32 at the top end of the liquid guiding pipe 31 of the liquid storage barrel 3 is started to drive the drilling fluid to flow into the simulation barrel 11. During drilling, the drilling fluid is used to cool the drill bit 35. At the same time, the temperature of the heating rod 23 in the heating member 2 and the temperature of the heating oil in the liquid storage cylinder 21 are adjusted according to requirements, so as to heat the internal drilling fluid. After drilling is completed, the drilling fluid flows downward into the drain cylinder 151, the valve on the sampling pipe 152 is opened to collect the drilling fluid for detection, and then the mud pump 32 at the top end of the liquid guiding pipe 31 of the liquid storage barrel 3 is started to drive the drilling fluid to flow back into the liquid storage barrel 3.

[0030] The above is the preferred embodiment of the present invention. Those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiment. Therefore, the present invention is not limited to the above specific embodiments. Any obvious improvements, substitutions or variations made by those skilled in the art based on the present invention fall within the protection scope of the present invention.

Claims

1. A test device for the circulation of high-temperature foam drilling fluid in a geothermal well, characterized in that, It includes a test piece (1), a heating piece (2) and a liquid storage barrel (3). The test piece (1) includes a simulation barrel (11). Both the upper and lower ends of the simulation barrel (11) are open, and internal threads are provided at the bottom of the inner circumferential surface of the simulation barrel (11). A screw cap (15) is assembled by threading at the bottom end of the simulation barrel (11), and a core (16) is vertically supported on the top surface of the screw cap (15). A drain tube (151) is vertically and fixedly connected to the bottom end of the screw cap (15), and multiple sampling tubes (152) are horizontally provided in the vertical direction on the outer circumferential surface of the drain tube (151). The heating piece (2) includes a liquid storage barrel (21). The liquid storage barrel (21) is sleeved outside the simulation barrel (11), and multiple heating rods (23) are vertically fixed inside the liquid storage barrel (21). A gland (33) is vertically slidably assembled at the open top end of the simulation barrel (11). The liquid storage barrel (3) is arranged on one side of the simulation barrel (11), and liquid guide tubes (31) are fixedly connected to both the upper and lower ends of the liquid storage barrel (3). The bottom liquid guide tube (31) of the liquid storage barrel (3) is fixedly connected to the drain tube (151), and the top liquid guide tube (31) of the liquid storage barrel (3) is fixedly connected to the gland (33). Mud pumps (32) are assembled and connected in series on the liquid guide tubes (31) at both the upper and lower ends of the liquid storage barrel (3).

2. The testing device for the circulation of a high-temperature foam drilling fluid in a geothermal well according to claim 1, characterized in that: A motor (34) is vertically fixed on the top surface of the gland (33), a drill bit (35) is vertically rotatably connected to the bottom surface of the gland (33), and the top surface of the drill bit (35) is fixedly connected to the output end of the motor (34).

3. The testing device for the circulation of high-temperature foam drilling fluid in a geothermal well according to claim 2, wherein: A hole frame (12) is horizontally fixed on the outer wall of the simulation barrel (11), and a lifting rod frame (13) is vertically slidably assembled on the hole frame (12).

4. The testing device for the circulation of high-temperature foam drilling fluid in a geothermal well according to claim 3, characterized in that: A hydraulic rod (14) is vertically fixed on the top surface of the hole frame (12), and the output end of the hydraulic rod (14) is fixed on the lifting rod frame (13).

5. The test device for circulating a high-temperature foam drilling fluid in a geothermal well according to claim 4, characterized in that: A pressure column (131) is vertically fixed on the top of the lifting rod frame (13), and the bottom end of the pressure column (131) is fixed on the top surface of the gland (33).

6. The testing device for the circulation of a high-temperature foam drilling fluid in a geothermal well according to claim 5, characterized in that: A heat insulation pad (22) is sleeved on the outer wall of the liquid storage barrel (21).

7. The testing device for the circulation of high-temperature foam drilling fluid in a geothermal well according to claim 6, characterized in that: A bracket (111) is vertically fixed on the bottom of the outer circumferential surface of the simulation barrel (11), and a fixing screw (112) is vertically threaded through and assembled at the bottom end of the bracket (111).

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