Downhole dynamic temperature measuring nipple

Abstract

The invention belongs to the field of underground well cementation and completion, particularly relates to an underground dynamic temperature measurement short section, and aims to solve the problems that in the prior art, in highly-deviated well or complex stratum construction, multi-time cable logging needs to be carried out on single-stratum multi-angle temperature measurement, so that many risks are increased in the whole construction process, and resources are wasted. The short section comprises a measuring short section main body and a thermodetector, the measuring nipple main body is connected between every two adjacent drill rods on a drill rod column, and the thermodetector is arranged in the measuring nipple main body and used for measuring temperature signals and formation pressure in a well. Compared with the prior art, the device enters a well while drilling, does not need to add additional working procedures, is simple to operate, safe and reliable, and can accurately measure the underground environment temperature and pressure, thereby playing a powerful supporting role in designing high-quality cement paste and formulating related processes of well cementation construction.

Description

Technical Field

[0001] The present invention belongs to the field of downhole cementing completion, and specifically relates to a downhole dynamic temperature measurement sub. Background Art

[0002] In deep well and ultra-deep well cementing, the downhole temperature has an important influence on the thickening time of cement slurry and the selection of the overall formula. A lower temperature measurement will seriously shorten the pumpable time of the cement slurry, easily causing cementing accidents. A higher temperature measurement will extend the waiting-on-cement time of the cement slurry, and even may occur super-retarding, where the top of the cement column will not completely solidify for more than ten days, delaying subsequent construction operations. Therefore, it is very important to accurately measure the dynamic circulation temperature of the downhole cement slurry.

[0003] At present, the temperature of the cementing construction section is mainly obtained by means of software simulation, logging-while-drilling (LWD) instruments, cable instruments, etc.

[0004] The formation parameters set inside the simulation software may have a large deviation from the simulation results due to the irregular movement of the formation, and the advancement, scientificity and functionality of the software still need to be improved. For conventional LWD instruments, affected by the production status of the well, fluid type, casing and cement sheath, etc., although they can reflect the formation temperature, the temperature will increase accordingly as the formation depth increases. After the temperature exceeds 160°C, the sensor is prone to misalignment and malfunction, and it is difficult to be sent in place in horizontal wells. The cable instrument measurement method is similar to the LWD measurement-while-drilling method. In the construction of highly deviated wells or complex formations, multiple cable logging operations are required for multi-angle temperature measurement of a single formation, thus adding many risks and resource waste to the entire construction process.

[0005] Based on this, the present invention proposes a downhole dynamic temperature measurement sub. Summary of the Invention

[0006] In order to solve the above problems in the prior art, that is, in the construction of highly deviated wells or complex formations in the prior art, multiple cable logging operations are required for multi-angle temperature measurement of a single formation, thus adding many risks and resource waste to the entire construction process. The present invention provides a downhole dynamic temperature measurement sub, which includes a measurement sub body and a temperature gauge;

[0007] The measurement sub body is connected between every two adjacent drill pipes on the drill pipe string, and the temperature gauge is arranged inside the measurement sub body. The temperature gauge is used to measure the temperature signal and formation pressure in the well.

[0008] In some preferred embodiments, the temperature gauge is arranged inside the measurement sub body, and its specific structure is as follows:

[0009] On the outer circumferential surface of the main body of the measurement nipple, a temperature measurement groove is provided. A thermometer is installed in the temperature measurement groove, and a fixed upper cover is installed on the temperature measurement groove. The fixed upper cover is used to fix the thermometer to the main body of the measurement nipple.

[0010] In some preferred embodiments, a shock-absorbing ring is installed between the outer surface of the thermometer and the surface of the temperature measurement groove. The shock-absorbing ring is used to prevent damage to the thermometer.

[0011] In some preferred embodiments, shock-absorbing pads are installed between both ends of the thermometer and the temperature measurement groove. The shock-absorbing pads are used to prevent damage to the thermometer.

[0012] In some preferred embodiments, multiple groups of the shock-absorbing rings are arranged along the length direction of the thermometer body.

[0013] In some preferred embodiments, the thermometer measures the formation pressure and the temperature signal through a sensor measurement system provided inside it.

[0014] In some preferred embodiments, two sets of the sensor measurement systems are provided and backed up with each other to ensure playback of the formation pressure and the temperature signal.

[0015] Advantages of the present invention:

[0016] Compared with the prior art, the present invention has a delicate structure and does not require changing or adding construction steps. It can be installed at multiple positions on the drill pipe, be lowered into the well along with the drill pipe, and simultaneously measure the temperature and pressure. It is simple to operate, safe and reliable, and can accurately measure the downhole environmental temperature and pressure, thus strongly supporting the design of high-quality cement slurry and the formulation of related cementing construction processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives and advantages of the present application will become more obvious:

[0018] Figure 1 is an internal structure schematic diagram of a downhole dynamic temperature measurement nipple of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present application 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 related invention and are not intended to limit the invention. Additionally, it should be noted that for the sake of description, only parts related to the relevant invention are shown in the drawings.

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] As shown in Figure 1 , the present invention provides a downhole dynamic temperature measurement sub, which includes a measurement sub body 1 and a temperature measuring instrument 2;

[0022] The measurement sub body 1 is connected between every two adjacent drill pipes on the drill pipe string, the temperature measuring instrument 2 is arranged inside the measurement sub body 1, and the temperature measuring instrument 2 is used to measure the temperature signal and formation pressure in the well.

[0023] As a further explanation of the present invention, referring to Figure 1 , the temperature measuring instrument 2 is arranged inside the measurement sub body 1, and its specific structure is:

[0024] A temperature measurement groove is formed on the outer circumferential surface of the measurement sub body 1, the temperature measuring instrument 2 is installed in the temperature measurement groove, and a fixed upper cover 1-1 is installed on the temperature measurement groove, and the fixed upper cover 1-1 is used to fix the temperature measuring instrument 2 to the measurement sub body 1.

[0025] As a further explanation of the present invention, referring to Figure 1 , a shock-absorbing ring 1-2 is installed between the outer surface of the temperature measuring instrument 2 and the surface of the temperature measurement groove, and the shock-absorbing ring 1-2 is used to prevent the temperature measuring instrument 2 from being damaged.

[0026] As a further explanation of the present invention, referring to Figure 1 , shock-absorbing pads 1-3 are installed between both ends of the temperature measuring instrument 2 and the temperature measurement groove, and the shock-absorbing pads 1-3 are used to prevent the temperature measuring instrument 2 from being damaged.

[0027] As a further explanation of the present invention, referring to Figure 1 , multiple groups of the shock-absorbing rings 1-2 are arranged along the length direction of the body of the temperature measuring instrument 2.

[0028] As a further explanation of the present invention, the temperature measuring instrument 2 measures the formation pressure and the temperature signal through a sensor measurement system arranged inside it.

[0029] As a further explanation of the present invention, the sensor measurement system is provided with two sets and backs up each other to ensure the playback of the formation pressure and the temperature signal.

[0030] Among them, the present invention can install sensors with different ranges inside and outside the body according to different well conditions, or can also select one of the two sensors for individual use according to needs, expanding the applicable range of the instrument.

[0031] The terms "first", "second", etc. are used to distinguish similar objects and are not used to describe or indicate a specific order or sequence.

[0032] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, methods, articles, or apparatus / devices.

[0033] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A downhole dynamic temperature measurement sub, characterized in that, the sub includes a measurement sub body (1) and a thermometer (2); the measurement sub body (1) is connected between every two adjacent drill pipes on the drill pipe string, the thermometer (2) is arranged inside the measurement sub body (1), and the thermometer (2) is used for measuring the temperature signal and formation pressure in the well.

2. The downhole dynamic temperature measurement sub according to claim 1, characterized in that, the thermometer (2) is arranged inside the measurement sub body (1), and its specific structure is: a temperature measurement groove is formed on the outer circumferential surface of the measurement sub body (1), the thermometer (2) is installed in the temperature measurement groove, and a fixed upper cover (1-1) is installed on the temperature measurement groove, and the fixed upper cover (1-1) is used for fixing the thermometer (2) to the measurement sub body (1).

3. The downhole dynamic temperature measurement sub according to claim 2, characterized in that, a shock-absorbing ring (1-2) is installed between the outer surface of the thermometer (2) and the surface of the temperature measurement groove, and the shock-absorbing ring (1-2) is used to prevent the thermometer (2) from being damaged.

4. The downhole dynamic temperature measurement sub according to claim 3, characterized in that, shock-absorbing pads (1-3) are installed between both ends of the thermometer (2) and the temperature measurement groove, and the shock-absorbing pads (1-3) are used to prevent the thermometer (2) from being damaged.

5. The downhole dynamic temperature measurement sub according to claim 4, characterized in that, multiple groups of the shock-absorbing rings (1-2) are arranged along the length direction of the thermometer (2) body.

6. The downhole dynamic temperature measurement sub according to claim 5, characterized in that, the thermometer (2) measures the formation pressure and the temperature signal through a sensor measurement system arranged inside it.

7. The downhole dynamic temperature measurement sub according to claim 6, characterized in that, the sensor measurement system is provided with two sets and backs up each other to ensure the playback of the formation pressure and the temperature signal.

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