Underground casing erosion simulation test device

Abstract

The utility model belongs to the technical field of testing devices, and particularly provides a downhole casing erosion simulation testing device. The underground casing pipe erosion simulation test device comprises an erosion test box, a stirring system and a sand blasting pipeline for communicating the erosion test box with the stirring system, the erosion test box is communicated with a sand-liquid separation tank, and the sand-liquid separation tank is provided with a sand discharge port and a liquid circulation port and is communicated with the stirring system through the liquid circulation port. According to the utility model, the sand-carrying liquid after the test flows into the sand-liquid separation tank, the sand-carrying liquid is precipitated in the sand-liquid separation tank to form a sand layer and a liquid layer, the test sand can be unloaded from the sand unloading port and is convenient to recycle, and the liquid flows to the stirring system from the liquid circulation port to directly complete secondary recycling. Compared with the prior art, the sand-carrying fluid in the erosion test box disclosed by the utility model is convenient to clean and can be directly recycled, so that the cleaning and recycling efficiency of the sand-carrying fluid is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing devices, in particular to a downhole casing erosion simulation testing device. Background Art

[0002] In the production of oil (gas) wells, the casing is constantly eroded by the formation fluid and is prone to damage. Especially in sandy formations, the fluid carries sand and the casing erosion damage problem is more serious. Therefore, it is necessary to study the casing erosion resistance performance according to the sand production condition of oil (gas) wells.

[0003] The casing erosion simulation test device in the prior art generally includes a stirring tank, an erosion test box and a pumping pump. The sand-carrying liquid is mixed in the stirring tank, and the erosion test box is provided with a sandblasting head. During the test, the tested casing is placed in the erosion test box, and the pumping pump pumps the sand-carrying liquid in the stirring tank and sprays it out from the sandblasting head. The high-speed flowing sand acts on the casing, and the changes in the casing morphology after a certain period of time are observed to judge the anti-erosion characteristics. For example, the casing hole erosion test system disclosed in the patent application document with application publication number CN111077062A (publication date: 2020.04.28).

[0004] However, in the casing erosion simulation test device in the prior art, the sand-carrying liquid will remain in the erosion test box during the test, and the sand-carrying liquid needs to be cleaned after the test is completed, which is inefficient. At the same time, the sand-carrying liquid is also difficult to recycle, resulting in waste. Utility Model Content

[0005] The utility model aims to provide a downhole casing erosion simulation test device to solve the technical problem of low recovery efficiency of sand-carrying liquid in an erosion test box in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the downhole casing erosion simulation test device provided by the utility model is:

[0007] A downhole casing erosion simulation test device comprises an erosion test box, a stirring system and a sandblasting pipeline connecting the erosion test box and the stirring system. The erosion test box is connected to a sand-liquid separation tank, which is provided with a sand discharge port and a liquid flow port, and is connected to the stirring system through the liquid flow port.

[0008] The beneficial effect is that the utility model improves the casing erosion simulation test device in the prior art, adds a sand-liquid separation tank connected to the erosion test box, the sand-carrying liquid after the test is completed flows into the sand-liquid separation tank, and the sand-carrying liquid forms a sand layer and a liquid layer after settling in the sand-liquid separation tank, the test sand can be unloaded from the sand unloading port, which is convenient for recycling, and the liquid flows from the liquid flow port to the stirring system to directly complete the secondary recycling. Compared with the prior art, the sand-carrying liquid in the erosion test box of the utility model is easy to clean and can be directly recycled, which improves the cleaning and recycling efficiency of the sand-carrying liquid.

[0009] As a further improvement, the sand-liquid separation tank comprises a primary separation tank and a secondary separation tank connected in series, the primary separation tank is connected to the erosion test box, and the secondary separation tank is connected to the stirring system.

[0010] The beneficial effect is that the sand-carrying liquid is separated and precipitated through secondary separation, thus ensuring the sand-liquid separation effect.

[0011] As a further improvement, a liquid baffle is provided inside the primary separation tank, which is arranged between the connecting port between the primary separation tank and the erosion test box and the connecting port between the primary separation tank and the secondary separation tank, and its lower end has a certain distance from the bottom of the primary separation tank, and the distance forms a flow channel.

[0012] The beneficial effect is that the liquid baffle forms a "U"-shaped flow channel in the primary separation tank, which increases the channel length and ensures the separation efficiency.

[0013] As a further improvement, a sieve plate is provided inside the secondary separation tank, and the sieve plate is used to separate and filter the sand and liquid to separate the secondary separation tank into a sand chamber and a liquid chamber.

[0014] The beneficial effect is that the sieve plate plays a filtering role, further improving the sand-liquid separation effect.

[0015] As a further improvement, the sieve plate extends obliquely upward from the tank bottom of the secondary separation tank, and its extension starting point has a certain interval with a side wall of the secondary separation tank, and the interval forms a sand unloading channel of the sand unloading port.

[0016] The beneficial effects are: the lateral space of the secondary separation tank is efficiently utilized, and the separated test sand falls into the bottom discharge port under the action of gravity, thereby improving the separation efficiency.

[0017] As a further improvement, the test device also includes a drying device, which is used to dry the sand separated by the sand-liquid separation tank.

[0018] The beneficial effect is that the drying device quickly dries the separated test sand, further improving the test sand recovery efficiency.

[0019] As a further improvement, the erosion test box is a funnel-shaped test box.

[0020] The beneficial effect is: the circulation efficiency of the sand-carrying fluid is improved.

[0021] As a further improvement, the stirring system includes a viscosity agent filling device.

[0022] The beneficial effect is that it ensures that the test sand and the liquid can be fully mixed.

[0023] As a further improvement, the stirring system includes a liquid stirring tank and a sand mixing stirring tank connected in series, and the viscosity agent filling device is connected to the liquid stirring tank.

[0024] The beneficial effect is: firstly, a mixed liquid with a certain viscosity and suspension degree is formed in the liquid stirring tank, and then the mixed liquid is mixed with the test sand to form a sand-carrying liquid, thereby improving the mixing degree of the test sand and the liquid in the sand-carrying liquid.

[0025] As a further improvement, the test device also includes a detection device, which includes at least one of a flow rate sensor, a temperature sensor, and a pressure sensor.

[0026] The beneficial effect is that comparative tests under different flow rates, temperatures and pressures can be realized, thereby expanding the use of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of Example 1 of the downhole casing erosion simulation test device in the utility model.

[0028] Description of reference numerals:

[0029] 1. Clean water tank; 2. Viscosity agent container; 3. Feed mixing device; 4. Liquid stirring tank; 5. Sand storage container; 6. Sand feeding mixing device; 7. Sand mixing tank; 8. Pumping pump; 9. Detection device; 10. Erosion test box; 11. Test casing; 12. Primary separation tank; 13. Secondary separation tank; 14. Drying device; 15. Recovery sand container; 16. Slag retaining plate; 17. Screen plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0032] It should be noted that relational terms such as "first" and "second" that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the sentence "including a...", etc., do not exclude the process or method that includes the elements.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The present invention is further described in detail below in conjunction with the embodiments.

[0036] Specific embodiment 1 of the downhole casing erosion simulation test device provided by the utility model:

[0037] The downhole casing erosion simulation test device provided in this embodiment is as follows: Figure 1As shown, it includes a clean water tank 1, which provides clean water for stirring to form a sand-carrying liquid. The clean water tank 1 is connected to the liquid stirring tank 4 through a connecting pipe, and the connecting pipe is connected to a feed mixing device 3. The viscosity agent in the viscosity agent container 2 can be added to the liquid stirring tank 4 through the feed mixing device 3, that is, the viscosity agent container 2 and the feed mixing device 3 form a viscosity agent filling device. The viscosity agent is fully mixed with clean water in the liquid stirring tank 4 to form a mixed liquid with a certain viscosity and suspension. The liquid stirring tank 4 is connected to the sand mixing tank 7 through a connecting pipe, and the connecting pipe is connected to a sand feeding mixing device 6. The test sand in the sand storage container 5 can enter the sand mixing tank 7 through the sand feeding mixing device 6. The mixed liquid in the liquid stirring tank 4 enters the sand mixing tank 7 and is fully mixed with the test sand to form a sand-carrying liquid for the test erosion test. In order to facilitate the mixed liquid in the liquid stirring tank 4 to enter the sand mixing tank 7, a pumping pump (not shown in the figure) can also be connected between the liquid stirring tank 4 and the sand mixing tank 7. The erosion test box 10 is provided with a plurality of sandblasting nozzles, the nozzles are directed toward the tested casing 11, the sand-carrying liquid in the sand mixing tank 7 is pumped outward by the pumping pump 8, and sprayed out from the sandblasting nozzles toward the tested casing 11, thereby simulating the erosion condition of the casing under the sand-containing formation. It should be noted that the tested casing 11 is not limited to the casing, but can also be a screen pipe, a perforated pipe, etc.

[0038] The test sand content, viscosity, injection time, pressure, temperature and other parameters in the test sand-carrying fluid are determined according to the test requirements.

[0039] The erosion test box 10 is connected to a sand-liquid separation tank, which is used to recover the sand-carrying liquid after the test, perform sand separation, and return the separated liquid to the liquid stirring tank 4, thereby improving the recovery efficiency and the utilization rate of the sand-carrying liquid. In this embodiment, the sand-liquid separation tank includes a primary separation tank 12 and a secondary separation tank 13, wherein the primary separation tank 12 is connected to the erosion test box 10, and the secondary separation tank 13 has a liquid flow port, and is connected to the liquid stirring tank 4 through the liquid flow port, and the primary separation tank 12 and the secondary separation tank 13 are connected in series, and both have a sand discharge port. In this way, the sand-carrying liquid after two-stage separation ensures the sand-liquid separation effect.

[0040] A slag retaining plate 16 is provided inside the primary separation tank 12. The slag retaining plate 16 extends from top to bottom, and there is still a certain interval between the lower end and the bottom of the primary separation tank 12, and the interval forms a flow passage for the sand-carrying liquid. The slag retaining plate 16 separates the primary separation tank 12 to form a "U"-shaped flow passage, which is equivalent to extending the flow passage and enhancing the separation effect of the primary separation tank 12.

[0041] A sieve plate 17 is provided inside the secondary separation tank 13, and the sieve plate 17 plays a role in filtering the test sand and the mixed liquid in the sand-carrying liquid, and separates the secondary separation tank 13 into a sand cavity and a liquid cavity. Specifically, in this embodiment, the sieve plate 17 extends upwardly from the bottom of the secondary separation tank 13, and its starting point is still at a certain interval from the inner wall of the secondary separation tank 13, and the sand discharge port of the secondary separation tank 13 is arranged at the interval, and the interval forms a sand discharge channel. The test sand filtered and separated by the sieve plate 17 falls to the sand discharge port, and the mixed liquid passes through the sieve plate 17 and falls into the liquid cavity, and is recovered into the liquid stirring tank 4.

[0042] After separation is completed, the sand discharge ports of the primary separation tank 12 and the secondary separation tank 13 are opened, and the test sand falls into the collection tray below. In this embodiment, a drying device 14 is also configured to quickly heat and dry the test sand in the collection tray, which further improves the test sand recovery efficiency. The dried test sand is recovered into the recovery sand container 15.

[0043] Furthermore, in order to increase the speed at which the sand-carrying liquid flows into the separation tank, the erosion test box 10 in this embodiment is funnel-shaped.

[0044] This embodiment is also equipped with a detection device 9, which includes a sensor. The sensor type is determined according to the test requirements, such as a flow rate sensor for detecting the flow rate of the sand-carrying liquid, a pressure sensor for detecting the pressure of the sand-carrying liquid, a temperature sensor for detecting the temperature of the sand-carrying liquid, etc. This makes it easy to control different parameters, thereby realizing comparative tests and expanding the use of the test device.

[0045] The specific embodiment 2 of the downhole casing erosion simulation test device provided by the utility model mainly differs from the embodiment 1 in that: in the embodiment 1, the stirring system includes a liquid stirring tank 4 and a sand mixing stirring tank 7 connected in series, so that the viscosity agent and the clean water can be fully mixed in advance, ensuring the mixing of the viscosity agent. In this embodiment, the stirring system can include only a primary sand mixing stirring tank, and the viscosity agent can be directly added to the sand mixing stirring tank. In fact, in other embodiments, the viscosity agent may not be added, and the clean water and the test sand are fully mixed to form a sand-carrying liquid.

[0046] The specific embodiment 3 of the downhole casing erosion simulation test device provided by the utility model is mainly different from the embodiment 1 in that: in the embodiment 1, the sand-liquid separation tank includes a primary separation tank 12 and a secondary separation tank 13 connected in series, so that the sand-liquid separation effect is better. In this embodiment, the sand-liquid separation tank can only include a primary separation tank, and the primary separation tank is directly connected to the stirring system.

[0047] The specific embodiment 4 of the downhole casing erosion simulation test device provided by the utility model is different from the embodiment 1 mainly in that: in the embodiment 1, a slag retaining plate 16 is provided inside the primary separation tank 12, and a sieve plate 17 is provided inside the secondary separation tank 13. In this embodiment, the slag retaining plate and the sieve plate may not be provided.

[0048] The specific embodiment 5 of the downhole casing erosion simulation test device provided by the utility model is mainly different from the embodiment 1 in that: in the embodiment 1, the sieve plate inside the secondary separation tank 12 extends obliquely from bottom to top. In this embodiment, the sieve plate can be arranged horizontally, and the sieve plate separates the secondary separation tank 12 into two upper and lower chambers. When recycling, the upper cover of the secondary separation tank 12 is opened to take out the sieve plate to complete the test sand recovery, and at this time, the upper opening of the secondary separation tank forms a sand discharge port.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A downhole casing erosion simulation test device, comprising an erosion test box, a stirring system and a sandblasting pipeline connecting the erosion test box and the stirring system, characterized in that: The erosion test box is connected to a sand-liquid separation tank, which is provided with a sand discharge port and a liquid flow port, and is connected to a stirring system through the liquid flow port.

2. The downhole casing erosion simulation test device according to claim 1, characterized in that: The sand-liquid separation tank comprises a primary separation tank and a secondary separation tank connected in series, the primary separation tank is communicated with the erosion test box, and the secondary separation tank is communicated with the stirring system.

3. The downhole casing erosion simulation test device according to claim 2, characterized in that: A liquid baffle is provided inside the primary separation tank, which is arranged between the connecting port between the primary separation tank and the erosion test box and the connecting port between the primary separation tank and the secondary separation tank, and its lower end is spaced a certain distance from the bottom of the primary separation tank, and the space forms a flow channel.

4. The downhole casing erosion simulation test device according to claim 2 or 3, characterized in that: A sieve plate is provided inside the secondary separation tank, and the sieve plate is used to separate and filter sand and liquid, so as to separate the secondary separation tank into a sand chamber and a liquid chamber.

5. The downhole casing erosion simulation test device according to claim 4, characterized in that: The sieve plate extends obliquely upward from the tank bottom of the secondary separation tank, and a certain interval exists between the extension starting point and a side wall of the secondary separation tank, and the interval forms a sand discharge channel of the sand discharge port.

6. The downhole casing erosion simulation test device according to any one of claims 1 to 3, characterized in that: The test device also includes a drying device, which is used to dry the sand separated by the sand-liquid separation tank.

7. The downhole casing erosion simulation test device according to any one of claims 1 to 3, characterized in that: The erosion test box is a funnel-shaped test box.

8. The downhole casing erosion simulation test device according to any one of claims 1 to 3, characterized in that: The stirring system comprises a viscosity agent filling device.

9. The downhole casing erosion simulation test device according to claim 8, characterized in that: The stirring system comprises a liquid stirring tank and a sand mixing stirring tank connected in series, and the viscosity agent filling device is communicated with the liquid stirring tank.

10. The downhole casing erosion simulation test device according to any one of claims 1 to 3, characterized in that: The test device also includes a detection device, which includes at least one of a flow rate sensor, a temperature sensor, and a pressure sensor.

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