Test device and test method for sleeve scraping tool

Abstract

The invention belongs to the technical field of oil and gas field drilling and completion, and discloses a testing device and a testing method of a casing scraping tool, and the testing device of the casing scraping tool comprises a testing casing, a scraping body, a driving part and a temperature control device; the scraping body can move in the test sleeve in the axial direction of the test sleeve, a groove is formed in the peripheral wall of the scraping body, and a spring can be installed in the groove so that the scraper can face the inner wall of the test sleeve; the output end of the driving part penetrates through the test sleeve in a sealing manner and is connected to the scraping body; the temperature control device comprises a heating end, and the heating end extends into the test sleeve so as to change the temperature in the test sleeve. According to the casing scraping tool testing method, by means of the casing scraping tool testing device, the underground scraping process can be simulated on the ground under the condition that cost is saved, and important technical support is provided for well entering of the casing scraping tool.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field drilling and completion, and particularly relates to a test device for a casing scraping tool and a test method thereof. Background Art

[0002] In the oil testing and completion operation, tools such as casing scraping tools are commonly used to remove cement stone, hard wax, various salt crystals and sediments remaining on the inner wall of the casing, so as to ensure that subsequent tools such as packers can smoothly enter the well and be set in the casing. Wellbore cleaning has become an essential process. Especially during the operation of deep wells and ultra-deep wells, multiple cleaning tools need to be used jointly to effectively clean the casing.

[0003] Although wellbore cleaning tools are widely used, there is a lack of methods or standards for detecting the performance of the tools. Only by checking the performance of components such as scrapers and springs in the casing scraping tool can the use performance of the tool be roughly judged. In a few cases, application tests need to be carried out in a test well to evaluate the tool performance, which has high test costs, low efficiency and high risks, and has a great impact on the subsequent string running, packer setting and other effects. There is an urgent need for a test device and a test method that can detect the casing scraping tool on the ground and can intuitively and efficiently detect its performance and cleaning effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device and a test method for a casing scraping tool, which can detect the performance and cleaning effect of the casing scraping tool on the ground and provide important technical support for the casing scraping tool to enter the well.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A test device for a casing scraping tool, the casing scraping tool includes a spring and a scraper connected to the spring, and the test device for the casing scraping tool includes:

[0007] A test casing that can accommodate drilling fluid;

[0008] A scraping body that can axially move along the test casing within the test casing, and a groove is provided on the outer peripheral wall of the scraping body, and the spring can be installed in the groove so that the scraper faces the inner wall of the test casing;

[0009] A driving part, the output end of the driving part penetrates the test casing in a sealed manner and is connected to the scraping body to drive the scraping body to move;

[0010] A temperature control device, the temperature control device includes a heating end that extends into the interior of the test casing to change the temperature inside the test casing.

[0011] Preferably, a connector is provided at the output end of the driving part, and the connector passes through the test sleeve and is screwed to the scraping body.

[0012] Preferably, the heating end is a heating pipe, and the heating pipe penetrates through the connector and the scraping body.

[0013] Preferably, a sleeve cover is provided at the axial end of the test sleeve, and the sleeve cover can open or seal the test sleeve.

[0014] Preferably, a plurality of groups of grooves are arranged along the axial direction of the scraping body.

[0015] Preferably, multiple grooves in the same group are located on the same outer diameter of the scraping body, and multiple grooves in different groups are staggered along the axial direction of the scraping body.

[0016] Preferably, a mounting seat is arranged in the groove, and the spring can be detachably mounted on the mounting seat.

[0017] There is also provided a test method for a casing scraping tool, which uses the test device for the casing scraping tool as described above, and includes the following steps:

[0018] S1. Prepare the test sleeve and install the casing scraping tool to be tested;

[0019] S2. Connect the driving part and the temperature control device;

[0020] S3. Preset the test parameters;

[0021] S4. The driving part drives the scraping body to move repeatedly in the test sleeve;

[0022] S5. Take out the scraping body, observe the cleaning condition of the test sleeve, and detect the wear condition of the scraper;

[0023] S6. Adjust the test parameters in S3 and repeat S4 and S5.

[0024] Preferably, preparing the test sleeve includes measuring the size of the test sleeve and arranging dirt and drilling fluid in the test sleeve;

[0025] After installing the casing scraping tool to be tested on the scraping body, test the elastic force of the spring and the telescopic stroke of the scraper in the groove.

[0026] Preferably, the preset test parameters in S3 include the heating temperature of the temperature control device, the driving speed driven by the driving part, and the time.

[0027] Advantages of the present invention:

[0028] The driving part drives the scraping body to move repeatedly in the test casing, so that the scraper scrapes the test casing. The temperature control device can heat the inside of the test casing to simulate the real downhole temperature. Furthermore, when detecting the cleaning effect of the entire casing scraping tool on the dirt in the test casing and the wear condition of the scraper on the ground, the test device of the casing scraping tool can simulate the downhole scraping process on the ground at low cost, providing important technical support for the casing scraping tool to enter the well. Description of the Drawings

[0029] Figure 1 is a schematic diagram of the test device of the casing scraping tool of the present invention;

[0030] Figure 2 is a flowchart of the test method of the casing scraping tool of the present invention.

[0031] In the figure:

[0032] 1. Test casing; 11. Casing cover; 12. Mounting seat; 2. Scraping body; 3. Groove; 4. Driving part; 41. Connector; 42. Driving shaft; 5. Temperature control device; 51. Heating end;

[0033] 10. Spring; 20. Scraper. Detailed Embodiments

[0034] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0035] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly under and obliquely under the second feature, or simply indicating that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left" and "right" are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] As Figure 1 shown, the present invention provides a test device for a casing scraping tool. It can be understood that the casing scraping tool includes a spring 10 and a scraper 20 connected to the spring 10; and the test device for the casing scraping tool includes a test casing 1, a scraping body 2, a driving part 4 and a temperature control device 5; the test casing 1 can accommodate drilling fluid; the scraping body 2 can axially move in the test casing 1 along the test casing 1, and a groove 3 is arranged on the outer peripheral wall of the scraping body 2, and the spring 10 can be installed in the groove 3 so that the scraper 20 faces the inner wall of the test casing 1; the output end of the driving part 4 hermetically penetrates the test casing 1 and is connected to the scraping body 2 to be able to drive the scraping body 2 to move; the temperature control device 5 includes a heating end 51, and the heating end 51 extends into the interior of the test casing 1 to be able to change the temperature inside the test casing 1.

[0039] By driving the scraping body 2 to repeatedly move in the test casing 1 through the driving part 4, the scraper 20 scrapes the test casing 1. The temperature control device 5 can heat the interior of the test casing 1 to simulate the real downhole temperature, and then it can detect the cleaning effect of the entire casing scraping tool on the dirt in the test casing 1 and the wear condition of the scraper 20 on the ground. This test device for the casing scraping tool can simulate the downhole scraping process on the ground at low cost and provides important technical support for the casing scraping tool to enter the well.

[0040] Among them, casing caps 11 are provided at the axial ends of the test casing 1. It can be understood that two casing caps 11 can be provided, located at both ends of the test casing 1 axially; or one casing cap 11 can be provided, located at one end of the test casing 1. Through the casing cap 11, it is convenient to arrange dirt for the test inside the test casing 1, and at the same time, it can seal the drilling fluid. The casing cap 11 and the test casing 1 can be sealed through a sealing ring provided on the casing cap 11.

[0041] The driving part 4 is connected with a driving shaft 42. A connecting head 41 is provided at the output end of the driving shaft 42. A threaded groove is provided inside the connecting head 41, and an external thread is provided at the end of the scraping body 2, so that the scraping body 2 is screwed onto the connecting head 41; so that different scraping bodies 2 can be replaced according to different test casings 1. A first through hole is provided on the casing cap 11, so that the driving shaft 42 can be hermetically inserted through the first through hole to enable the connecting head 41 to be located on the scraping body 2 inside the test casing 1. Thus, the driving part 4 drives the scraping body 2 to move repeatedly inside the test casing 1, and then the scraper 20 on the scraping body 2 scrapes the dirt on the inner wall of the test casing 1. In this embodiment, the driving is a driving motor.

[0042] In this embodiment, the heating end 51 of the temperature control device 5 is a heating pipe. The heating pipe is hermetically inserted through the connecting head 41 and the scraping body 2, which can avoid damaging the heating pipe during the repeated movement of the scraping body 2 and causing the temperature control to fail. Exemplarily, the temperature control device 5 can adopt a circulating heating device; based on this, one end of the heating pipe penetrates through the connecting head 41, and the other end penetrates out of the test casing 1 hermetically, so as to realize circulating heating. Exemplarily, the heating pipe is a flexible pipe.

[0043] In this embodiment, in order to increase the number of scrapers 20 and simulate different scenarios, multiple groups of grooves 3 are arranged along the axial direction of the scraping body 2. Multiple grooves 3 in the same group are located on the same outer diameter of the scraping body 2, and the grooves 3 in different groups are staggered along the axial direction of the scraping body 2, so that the distribution of the scrapers 20 can cover the entire circumference of the test casing 1, making the test results more accurate. Further, a mounting seat 12 is provided inside the groove 3, so that the spring 10 can be detachably mounted on the mounting seat 12. The structure of the mounting seat 12 is not specifically limited.

[0044] As Figure 2 shown, the present application also provides a test method for a casing scraping tool, using the test device of the above-mentioned casing scraping tool, which includes the following steps:

[0045] S1. Prepare the test casing 1 and install the casing scraping tool to be tested on the scraping body 2. During the preparation process, it is necessary to measure the size of the test casing 1 and arrange dirt and drilling fluid in the test casing 1 to simulate the real downhole environment. The dirt can be various types of dirt that easily appear downhole, such as cement scale, wax blocks, iron filings, etc.

[0046] Install the casing scraping tool to be tested on the scraping body 2, that is, install the spring 10 on the mounting seat 12 in the groove 3, and measure the elastic force of the spring 10 and the telescopic stroke of the scraper 20 in the groove 3. From this, the range value of the force exerted by the scraper 20 on the test casing 1 can be obtained, providing a reference for the subsequent entry of the casing scraping tool into the well.

[0047] S2. Install the scraping body 2 on the connector 41 of the driving part 4, place the scraping body 2 in the test casing 1, and close the casing cover 11.

[0048] S3. Preset the test parameters, where the test parameters include the heating temperature of the temperature control device 5, the driving speed of the driving part 4, and the time, and wait for the temperature in the test casing 1 to reach the above preset value.

[0049] S4. The driving part 4 drives the scraping body 2 to move repeatedly in the test casing 1 according to the above parameters.

[0050] S5. Take out the scraping body 2, observe the cleaning condition of the test casing 1, and detect the wear condition of the scraper 20 and the elastic change condition of the spring 10.

[0051] S6. Adjust the test parameters in S3 and repeat S4 and S5 to test the cleaning condition of the test casing 1, the wear condition of the scraper 20, and the elastic change condition of the spring 10 under different test parameter environments, providing important technical support for the subsequent selection of the casing scraping tool and the operation after the casing scraping tool enters the well.

[0052] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A test device for a casing scraping tool, the casing scraping tool comprising a spring (10) and a scraper (20) connected to the spring (10), characterized in that: include: A test casing (1), wherein the test casing (1) is capable of containing drilling fluid; A scraping body (2), the scraping body (2) being able to move axially along the test sleeve (1) and inside the test sleeve (1), the outer peripheral wall of the scraping body (2) being provided with a groove (3), the spring (10) being able to be installed in the groove (3) so that the scraper (20) faces the inner wall of the test sleeve (1); A driving part (4), wherein an output end of the driving part (4) is sealed and penetrates the test sleeve (1), and is connected to the scraping body (2) so as to be able to drive the scraping body (2) to move; A temperature control device (5), the temperature control device (5) comprising a heating end (51), the heating end (51) extending into the interior of the test sleeve (1) so as to be able to change the temperature inside the test sleeve (1).

2. The testing device for casing scraping tool according to claim 1, characterized in that: The output end of the driving part (4) is provided with a connector (41), and the connector (41) passes through the test sleeve (1) and is threadedly connected to the scraping body (2).

3. The testing device for casing scraping tool according to claim 2, characterized in that: The heating end (51) is a heating tube, and the heating tube passes through the connecting head (41) and the scraping body (2).

4. The testing device for casing scraping tool according to claim 3, characterized in that: A casing cover (11) is provided at an axial end of the test casing (1), and the casing cover (11) is capable of opening or sealing the test casing (1).

5. The testing device for casing scraping tool according to claim 1, characterized in that: The grooves (3) are arranged in multiple groups along the axial direction of the scraping body (2).

6. The testing device for casing scraping tool according to claim 5, characterized in that: The plurality of grooves (3) in the same group are located on the same outer diameter of the scraper body (2), and the plurality of grooves (3) in different groups are staggeredly distributed along the axial direction of the scraper body (2).

7. The testing device for casing scraping tool according to claim 1, characterized in that: A mounting seat (12) is provided in the groove (3), and the spring (10) can be detachably mounted on the mounting seat (12).

8. A casing scraping tool testing method, using the casing scraping tool testing device according to any one of claims 1 to 7, characterized in that: The steps include: S1, preparing the test casing (1), and installing the casing scraping tool to be tested; S2, connecting the driving unit (4) and the temperature control device (5); S3, preset test parameters; S4, the driving unit (4) drives the scraping body (2) to move repeatedly in the test sleeve (1); S5, taking out the scraping body (2), observing the cleanliness of the test sleeve (1), and detecting the wear of the scraper (20); S6. Adjust the test parameters in S3, and repeat S4 and S5.

9. The casing scraping tool testing method according to claim 8, characterized in that: Preparing the test casing (1) includes measuring the dimensions of the test casing (1) and arranging dirt and drilling fluid in the test casing (1); After the casing scraping tool to be tested is installed on the scraping body (2), the elastic force of the spring (10) and the telescopic stroke of the scraper (20) in the groove (3) are tested.

10. The casing scraping tool testing method according to claim 8, characterized in that: The test parameters preset in S3 include the heating temperature of the temperature control device (5), the driving speed and time of the driving part (4).

Images