Adapter capable of measuring underground temperature and mounting and using method thereof

Abstract

The invention discloses an adapter capable of measuring underground temperature and a mounting and using method thereof, and relates to the technical field of oil and gas underground construction, the adapter comprises an adapter body, the adapter body comprises a large-diameter end and a small-diameter end, the large-diameter end of the adapter body is provided with a temperature measuring structure, and the small-diameter end of the adapter body is provided with a temperature sensor; the temperature measuring structure comprises a mounting groove formed in the adapter body, a temperature collector is mounted at the bottom in the mounting groove, and the interior of the mounting groove is sealed through a sealing plug after the temperature collector is mounted. The temperature collector is connected to the adapter body, so that the underground dynamic temperature can be measured and recorded through the temperature collector when the soluble bridge plug is pumped, and the accuracy of judging the temperature grade and the dissolving performance of a soluble bridge plug tool is improved; the problem that the downhole dissolution effect of a final soluble bridge plug is affected due to the fact that no appropriate tool for measuring the downhole dynamic environment temperature exists in an existing Becker 10 # setting tool is solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas downhole construction, and in particular to an adapter capable of measuring downhole temperature and an installation and use method thereof. Background Art

[0002] At present, horizontal well volume fracturing is an important technology for the exploitation of unconventional oil and gas resources worldwide. Through hydraulic fracturing, reservoirs are transformed. While forming one or more main fractures, natural fractures are continuously expanded and brittle rocks are sheared and slipped, achieving the communication of natural fractures and rock stratification, and forcing the formation of secondary fractures in the lateral direction of the main fractures, and then branching on the secondary fractures to form secondary secondary fractures, and so on, forming a fracture network of natural fractures and artificial fractures interlaced with each other. In this way, the effective reservoir that can seep is broken up, and a comprehensive transformation in the three-dimensional directions of length, width and height is achieved, the seepage area and conductivity are increased, and the initial production and final recovery rate are improved.

[0003] The process of horizontal well volume fracturing involves the support of many raw materials, materials and downhole tools, including fracturing fluid, ceramsite, soluble bridge plugs, etc., which play a decisive role in the effect of volume fracturing. At present, in the practice of horizontal well volume fracturing, as a large amount of liquid is pumped into the well, there is a large deviation between the actual temperature during the operation and the formation temperature. However, under the current process technology environment, there is no effective means to dynamically monitor the temperature deviation in real time, resulting in weak pertinence in the process design of fracturing fluid, ceramsite, soluble bridge plugs, etc., and failing to effectively guarantee the best application effect.

[0004] Take soluble bridge plugs as an example. Since soluble bridge plug technology was introduced into China in 2015, it has been applied on a large scale in China's unconventional oil and gas resources field along with the development of China's shale gas revolution. Major oil and gas fields under oil companies such as CNPC, Sinopec and Yanchang Oilfield mainly use soluble bridge plugs in combination with on-site bridge-shooting joint technology to complete horizontal well volume fracturing operations. However, as China's shale gas development enters the "deep water area", well engineering structures continue to move towards deep wells and ultra-deep wells, accompanied by the application of ultra-high temperature environments. However, for underground ultra-high temperature environment operations, with the injection of large-volume liquids on the ground, the actual underground operating temperature data is still an unknown field, which has a great interference on the temperature level and dissolution performance design of soluble bridge plug tools, thereby affecting the final underground dissolution effect of soluble bridge plugs. Therefore, whether it is possible to achieve accurate measurement of well temperature is also an important technology to promote the development of soluble technology. Based on this, the demand for underground dynamic environmental temperature measurement is becoming increasingly urgent.

[0005] Currently, there is no suitable tool for measuring the dynamic ambient temperature downhole for the Baker 10# sealing tool. Summary of the invention

[0006] The technical problem to be solved by the present invention is that the current Baker 10# sealing tool does not have a suitable tool to measure the dynamic ambient temperature of the downhole environment, which affects the downhole dissolution effect of the final soluble bridge plug. The purpose is to provide an adapter that can measure the downhole temperature and its installation and use method, which solves the problem that the current Baker 10# sealing tool does not have a suitable tool to measure the dynamic ambient temperature of the downhole environment, which affects the downhole dissolution effect of the final soluble bridge plug.

[0007] The present invention is achieved through the following technical solutions:

[0008] In a first aspect, an adapter capable of measuring downhole temperature includes an adapter body, the adapter body including a large diameter end and a small diameter end, a temperature measuring structure is arranged on the large diameter end of the adapter body, the temperature measuring structure includes a mounting groove arranged on the adapter body, a temperature collector is installed at the bottom of the mounting groove, and a sealing plug is used to seal the mounting groove after the temperature collector is installed.

[0009] By connecting a temperature collector to the adapter body, the downhole dynamic temperature when the soluble bridge plug is pumped can be measured and recorded through the temperature collector, thereby improving the accuracy of judging the temperature grade and dissolution performance of the soluble bridge plug tool.

[0010] Furthermore, a heat conducting sheet is installed at the bottom of the installation groove, and the temperature collector is installed above the heat conducting sheet.

[0011] The thermal conductive sheet is located inside the adapter body and contacts the inside of the adapter body. In actual application, the temperature of the downhole liquid is transmitted to the adapter body, then to the medium in the mounting hole, and then to the temperature collector through the thermal conductive sheet, which effectively transmits the actual downhole temperature.

[0012] Compared with the structure without the heat conducting sheet, the temperature collected by the device without the heat conducting sheet structure is the temperature inside the adapter body, which has a certain deviation from the temperature of the external downhole liquid, and therefore cannot accurately measure the actual temperature of the downhole liquid outside the adapter. However, by adopting the temperature measurement structure with the heat conducting sheet in this application, in the actual application process, the heat conducting sheet quickly transmits the temperature of the external downhole liquid to the temperature collector inside the adapter, ensuring that the collected data is consistent with the actual well temperature, effectively ensuring the measurement effect and quality of the actual temperature.

[0013] Furthermore, a spring is installed between the bottom of the sealing plug and the temperature collector.

[0014] In actual application, the spring plays an effective role in supporting the temperature collector in a fixed position.

[0015] Compared with the structure without spring, the temperature collector of the structure without spring will vibrate back and forth inside the tool as the tool shakes during the well entry process, causing chip damage and inability to effectively collect and read data. In this application, a spring temperature measurement structure is set up, which effectively supports and fixes the temperature collector in actual application, avoiding damage to the temperature collector caused by shaking back and forth underground, and ensuring the safety and reliability of underground temperature data measurement and storage.

[0016] Furthermore, the structure of the installation groove includes a large diameter section, a middle diameter section, and a small diameter section from top to bottom, and a sealing structure is installed on the sealing plug located at the small diameter section of the installation groove.

[0017] Furthermore, the sealing structure includes an annular groove arranged on the sealing plug, and an O-ring is installed in the annular groove.

[0018] Furthermore, there is at least one sealing structure.

[0019] The sealing structure may be one, two or more.

[0020] By installing a sealing structure in the installation groove and using an O-ring for sealing, the liquid underground is prevented from seeping into the installation groove and causing damage to the temperature collector in the installation groove, thereby protecting the temperature collector and further improving the accuracy of the data collected by the temperature collector.

[0021] Furthermore, the sealing plug located at the middle diameter section of the mounting groove is connected to the mounting groove via a threaded structure; the top of the sealing plug is located at the large diameter end of the mounting groove and is fixed using a hexagonal nut.

[0022] The top of the sealing plug is fixed with a hexagonal nut, which can be tightened more quickly and efficiently during actual application, and has a better sealing effect, further improving the protection effect of the temperature collector installed in the installation groove.

[0023] Compared with the sealing plug with a one-piece cutter design, the sealing plug specified in the present application has a better sealing effect. The sealing plug with a one-piece cutter design is difficult to tighten during actual application, and there is a risk of the temperature collector coming into contact with external liquids, which can easily cause damage to the temperature collector in a short period of time, affecting the collection of downhole temperature.

[0024] Furthermore, an external thread is provided on the small diameter end of the adapter body, and a thread groove is provided on the large diameter end of the adapter body.

[0025] Secondly, the present application provides a method for installing an adapter that can measure downhole temperature. After installing the heat conductive sheet at the bottom of the installation groove, the temperature collector, spring, and sealing plug are installed from bottom to top, and the top of the sealing plug is locked using a hexagonal nut.

[0026] On the third aspect, the present application provides a method for using an adapter that can measure downhole temperature, wherein an adapter body provided with a temperature measuring structure is connected to the Baker 10# sealing tool and the soluble bridge plug assembly up and down, and then combined with other tools to form a fracturing pipe, and the adapter body is pumped downhole together with the soluble bridge plug, and the downhole dynamic temperature during the pumping of the soluble bridge plug is measured and recorded by the temperature collector on the adapter body, and after the fracturing pipe string is recovered, the downhole dynamic ambient temperature is obtained by extracting the data in the temperature collector.

[0027] The adapter body can be connected to the release lever of the matching soluble bridge plug through the lower thread and then welded into one piece for easy installation. The adapter and the release lever can also be designed as an integrated structure.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] (1) By connecting a temperature collector to the adapter body, the downhole dynamic temperature during pumping of the soluble bridge plug can be measured and recorded by the temperature collector, thereby improving the accuracy of the judgment of the temperature grade and dissolution performance of the soluble bridge plug tool;

[0030] (2) The present application provides a temperature measurement structure of a heat conducting sheet. In actual application, the heat conducting sheet quickly transmits the temperature of the external downhole liquid to the temperature collector inside the adapter, ensuring that the collected data is consistent with the actual well temperature, effectively ensuring the measurement effect and quality of the actual temperature;

[0031] (3) The present application provides a spring temperature measurement structure, which effectively supports and fixes the temperature collector in actual application, thus avoiding damage to the temperature collector caused by shaking back and forth underground, and ensuring the safety and reliability of underground temperature data measurement and storage;

[0032] (4) By installing a sealing structure in the installation groove and using an O-ring for sealing, the liquid in the well is prevented from seeping into the installation groove and damaging the temperature collector in the installation groove, thereby protecting the temperature collector and further improving the accuracy of the data collected by the temperature collector;

[0033] (5) The top of the sealing plug is fixed with a hexagonal nut, which can be tightened more quickly and efficiently in actual application, and has a better sealing effect, further improving the protection effect of the temperature collector installed in the installation groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of an adapter capable of measuring downhole temperature in Example 1 of the present invention;

[0036] Figure 2 for Figure 1 Sectional view in the AA direction;

[0037] Figure 3 for Figure 2 Enlarged view of middle B;

[0038] Figure 4 It is a cross-sectional view along the AA direction of an adapter capable of measuring downhole temperature in Example 2 of the present invention;

[0039] Figure 5 for Figure 4 Enlarged view of middle C;

[0040] Figure 6 This is a measurement result diagram of application case 1 in embodiment 1 of the present invention;

[0041] Figure 7 This is a diagram of the measurement results of the actual downhole tool entering the well in the third section of the application case 2 in the embodiment 1 of the present invention;

[0042] Figure 8 This is a diagram of the measurement results of the actual downhole tool entering the well in the 9th section of the application case 2 in the embodiment 1 of the present invention;

[0043] Fig. 9 This is a diagram of the measurement results of the actual downhole tool entering the well in the 13th section of the application case 2 in the embodiment 1 of the present invention.

[0044] Marks and corresponding parts names in the attached drawings:

[0045] 01-small diameter end, 02-external thread, 03-hexagonal nut, 04-installation slot, 05-large diameter end, 06-thread slot, 07-heat conductive sheet, 08-sealing plug, 09-large diameter section, 10-middle diameter section, 11-small diameter section, 12-O-ring, 13-spring, 14-temperature collector. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, a connection or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment provides an adapter capable of measuring downhole temperature, including an adapter body, the adapter body including a large diameter end 05 and a small diameter end 01, a temperature measuring structure is arranged on the large diameter end 05 of the adapter body, the temperature measuring structure includes a mounting groove 04 arranged on the adapter body, a temperature collector 14 is installed at the bottom of the mounting groove 04, and a sealing plug 08 is used to seal the mounting groove 04 after the temperature collector 14 is installed.

[0052] Specifically, a heat conducting sheet 07 is installed at the bottom of the installation groove 04 , and the temperature collector 14 is installed above the heat conducting sheet 07 .

[0053] The heat conductive sheet 07 is located inside the adapter body and contacts the inside of the adapter body. In actual application, the temperature of the downhole liquid is transmitted to the adapter body, then to the medium in the mounting hole, and then to the temperature collector 14 through the heat conductive sheet 07, thereby effectively transmitting the actual downhole temperature.

[0054] Compared with the structure without the heat conducting sheet 07, the temperature collected by the device without the heat conducting sheet 07 is the temperature inside the adapter body, which has a certain deviation from the temperature of the external downhole liquid, and therefore cannot accurately measure the actual temperature of the downhole liquid outside the adapter. However, in the temperature measurement structure with the heat conducting sheet 07 in the present application, in the actual application process, the heat conducting sheet 07 quickly transmits the temperature of the external downhole liquid to the temperature collector 14 inside the adapter, ensuring that the collected data is consistent with the actual well temperature, and effectively ensuring the measurement effect and quality of the actual temperature.

[0055] Specifically, a spring 13 is installed between the bottom of the sealing plug 08 and the temperature collector 14 .

[0056] In actual application, the spring 13 plays an effective role in supporting the temperature collector 14 in a fixed position.

[0057] Compared with the structure without spring 13, the temperature collector 14 of the structure without spring 13 will vibrate back and forth inside the tool as the tool shakes during the well entry process, causing chip damage and inability to effectively collect and read data. In the present application, the temperature measurement structure with spring 13 is provided, and in actual application, the temperature collector 14 is effectively supported and fixed, avoiding damage to the temperature collector 14 due to back and forth shaking underground, and ensuring the safety and reliability of underground temperature data measurement and storage.

[0058] Specifically, the sealing plug 08 located at the middle diameter section 10 of the installation groove 04 is connected to the installation groove 04 through a threaded structure; the top of the sealing plug 08 is located at the large diameter end of the installation groove 04 and is fixed with a hexagonal nut 03.

[0059] The top of the sealing plug 08 is fixed with a hexagonal nut 03, which can be tightened more quickly and efficiently during actual application, and has a better sealing effect, further improving the protection effect of the temperature collector 14 installed in the installation groove 04.

[0060] Compared with the sealing plug 08 with a one-way cutter design, the sealing plug 08 specified in the present application has a better sealing effect. The sealing plug 08 with a one-way cutter design is difficult to tighten during actual application, and there is a risk of the temperature collector 14 coming into contact with external liquids, which can easily cause the temperature collector 14 to be damaged in a short period of time, affecting the collection of downhole temperature.

[0061] Specifically, an external thread 02 is provided on the small diameter end 01 of the adapter body, and a thread groove 06 is provided on the large diameter end 05 of the adapter body.

[0062] The installation method of the adapter capable of measuring downhole temperature in this embodiment is as follows: after installing the heat conductive sheet 07 at the bottom of the installation groove 04 , the temperature collector 14 , the spring 13 , and the sealing plug 08 are installed in sequence from bottom to top, and the top of the sealing plug 08 is locked using the hexagonal nut 03 .

[0063] The method of using the adapter capable of measuring downhole temperature in this embodiment is as follows: the adapter body provided with the temperature measuring structure is connected to the Baker 10# sealing tool and the soluble bridge plug assembly up and down, and then combined with other tools to form a fracturing pipe, and the adapter body is pumped downhole together with the soluble bridge plug, and the downhole dynamic temperature when the soluble bridge plug is pumped is measured and recorded by the temperature collector 14 on the adapter body, and after the fracturing pipe string is recovered, the downhole dynamic ambient temperature is obtained by extracting the data in the temperature collector 14.

[0064] Application Case 1

[0065] The adapter capable of measuring downhole temperature in Example 1 was used to measure the temperature in the Shunan Gas Mine (XXX-213 Well). The relevant parameters of the well are shown in Table 1 below.

[0066] Table 1

[0067]

[0068] The static temperature of the formation in Well XXX-213 was measured to be 140.8°C. However, during the process of entering the well using the tool connected by the adapter with the temperature measuring structure in Example 1, the maximum temperature in the well was 78.5°C ( Figure 6 The actual formation static temperature is 43.2% lower than that of the actual formation static temperature.

[0069] Application Case 2

[0070] The adapter capable of measuring downhole temperature in Example 1 was used to measure Sichuan shale gas (XXX-H1-4 well). The relevant parameters of the well are shown in Table 2 below.

[0071] Table 2

[0072]

[0073]

[0074] The static temperature of the formation in Well XXX-H1-4 was measured to be 106°C. However, during the process of entering the well using the tool connected by the adapter with the temperature measuring structure in Example 1, the highest temperature experienced by the downhole tool during the third section of the actual downhole tool entry process was 73°C, which was 45.2% lower than the actual static temperature of the formation (e.g. Figure 7 ); During the actual downhole tool entry process in the 9th section, the highest downhole temperature was 93°C, which was 14.1% lower than the actual formation static temperature (as shown in Figure 8); During the actual downhole tool entry process in Section 13, the highest downhole temperature was 62°C, which was 43% lower than the actual formation static temperature (as shown in Fig. 9 shown).

[0075] According to the above test results, it can be known that in actual application, the adapter with a temperature measuring structure in this application is used to effectively measure the downhole formation temperature. In most cases, the actual temperature in the wellbore is about 40% lower than the static temperature of the formation, which is of great significance for the downhole application of soluble tools.

[0076] Example 2

[0077] like Figure 4 and Figure 5 As shown, based on Example 1, the difference between this example and Example 1 is that the structure of the installation groove 04 of this example includes a large diameter section 09, a middle diameter section 10, and a small diameter section 11 from top to bottom, and a sealing structure is installed on the sealing plug 08 located at the small diameter section 11 of the installation groove 04. The sealing structure is two annular grooves arranged on the sealing plug 08, the two annular grooves are 5 cm apart in the vertical direction, and O-type sealing rings 12 are installed in both annular grooves.

[0078] By installing a sealing structure in the installation groove 04 and using an O-ring 12 for sealing, the liquid from the well can be prevented from seeping into the installation groove 04 and causing damage to the temperature collector 14 in the installation groove 04, thereby protecting the temperature collector 14 and further improving the accuracy of the data collected by the temperature collector 14.

[0079] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adapter capable of measuring downhole temperature, comprising an adapter body, wherein the adapter body comprises a large diameter end (05) and a small diameter end (01), characterized in that: A temperature measuring structure is provided on the large diameter end (05) of the adapter body, the temperature measuring structure comprising a mounting groove (04) provided on the adapter body, a temperature collector (14) being installed at the bottom of the mounting groove (04), and a sealing plug (08) being used to seal the mounting groove (04) after the temperature collector (14) is installed.

2. The adapter capable of measuring downhole temperature according to claim 1, characterized in that: A heat conducting sheet (07) is installed at the bottom of the installation groove (04), and the temperature collector (14) is installed above the heat conducting sheet (07).

3. The adapter capable of measuring downhole temperature according to claim 1, characterized in that: A spring (13) is installed between the bottom of the sealing plug (08) and the temperature collector (14).

4. The adapter capable of measuring downhole temperature according to claim 1, characterized in that: The structure of the installation groove (04) comprises, from top to bottom, a large diameter section (09), a middle diameter section (10), and a small diameter section (11), and a sealing structure is installed on the sealing plug (08) located at the small diameter section (11) of the installation groove (04).

5. The adapter capable of measuring downhole temperature according to claim 4, characterized in that: The sealing structure comprises an annular groove arranged on the sealing plug (08), and an O-type sealing ring (12) is installed in the annular groove.

6. The adapter capable of measuring downhole temperature according to claim 5, characterized in that: There is at least one sealing structure.

7. The adapter capable of measuring downhole temperature according to claim 4, characterized in that: The sealing plug (08) located at the middle diameter section (10) of the installation groove (04) is connected to the installation groove (04) via a threaded structure; the top of the sealing plug (08) is located at the large diameter end of the installation groove (04) and is fixed using a hexagonal nut (03).

8. The adapter capable of measuring downhole temperature according to claim 1, characterized in that: An external thread (02) is provided on the small diameter end (01) of the adapter body, and a thread groove (06) is provided on the large diameter end (05) of the adapter body.

9. A method for installing an adapter capable of measuring downhole temperature according to any one of claims 1 to 8, characterized in that: After the heat conducting sheet (07) is installed at the bottom of the installation groove (04), the temperature collector (14), the spring (13), and the sealing plug (08) are installed in sequence from bottom to top, and the top of the sealing plug (08) is locked using the hexagonal nut (03).

10. A method for using the adapter capable of measuring downhole temperature according to any one of claims 1 to 8, characterized in that: The adapter body provided with a temperature measuring structure is connected to the Baker 10# sealing tool and the soluble bridge plug assembly up and down, and then combined with other tools to form a fracturing pipe. The adapter body is pumped into the well together with the soluble bridge plug. The downhole dynamic temperature when the soluble bridge plug is pumped is measured and recorded by the temperature collector (14) on the adapter body. After the fracturing pipe string is recovered, the downhole dynamic environmental temperature is obtained by extracting the data in the temperature collector (14).

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