CN110592669A - Well logging high temperature resistant encapsulation lanthanum bromide crystal and its encapsulation method - Google Patents

Abstract

The invention provides a well-logging high-temperature-resistant encapsulated lanthanum bromide crystal and an encapsulation method thereof, which relate to the technical field of crystal encapsulation, and the main purpose is to provide a lanthanum bromide-encapsulated crystal with better shock resistance and high temperature resistance. The high-temperature-resistant packaged lanthanum bromide crystal includes a crystal, a top cover, a casing and a sealing cover, wherein: the top cover is a tubular structure with openings at both ends, and a light-guiding glass is welded at the opening of one end, and the other end is connected to the The casing is fixedly connected by high-temperature-resistant adhesive to form a housing for the crystal; the outside of the crystal is wrapped with tetrafluoro tape so that the crystal is only exposed toward the side of the light-guiding glass; The sealing cover is threadedly connected with the casing, and the joint is coated with sealant. The invention is used in petroleum logging instruments to detect the intensity of radioactive elements contained in well wall rock formations, and then analyze the geological structure of rock formations.

Description

Well logging high temperature resistant encapsulation lanthanum bromide crystal and its encapsulation method

technical field

The invention relates to the technical field of crystal encapsulation, in particular to a logging high temperature resistant encapsulation lanthanum bromide crystal and an encapsulation method thereof.

Background technique

Lanthanum bromide crystals can be excited to emit fluorescent pulses when high-energy rays or radioactive particles pass through. Lanthanum bromide crystals are widely used in petroleum exploration, nuclear medicine, high-energy physics, safety inspection and other fields, and are an indispensable material for related high-tech industries.

Lanthanum bromide crystals are prone to deliquescence or cracking, and are prone to problems when subjected to external shocks or temperature changes. Therefore, precision packaging is required to meet the harsh external conditions of use.

Contents of the invention

The object of the present invention is to provide high-temperature-resistant packaged lanthanum bromide crystals for well logging and a package method thereof, so as to solve the technical problem that the packaged lanthanum bromide crystals are not shockproof in the prior art.

In order to achieve the above object, the present invention provides a logging high temperature resistant encapsulation method for lanthanum bromide crystal, comprising the following steps:

(1) Use tetrafluoro tape to tightly wrap the crystal so that only one side of the crystal is exposed;

(2) Weld the light guide glass on the metal sealing tube to form a shell with one end open;

(3) Putting the crystal treated in step (1) into the shell in step (2), making the exposed side of the crystal face the light guide glass, at this time, the crystal is closely attached to the inner wall of the shell;

(4) The sealing cover is fixedly connected to the shell from the outlet of the shell, thereby encapsulating the crystal.

Since the light guide glass is fixed on the housing by welding, compared with the traditional method, the firmness of the connection between the light guide glass and the housing is greatly improved, and the degree of sealing and shock resistance of the packaging crystal is further improved.

In the above technical solution, preferably, the light guide glass is sapphire.

In the above technical solution, preferably, an internal thread is provided at the opening of the housing, and the sealing cover is threadedly connected to the opening.

In the above technical solution, preferably, the sealing cover is recessed downward toward the middle of one side of the housing to form a cavity, and a sealant is coated in the cavity.

The sealing cover and the shell are not only fixedly connected by threads, but also bonded and connected by a sealant, which greatly improves the degree of sealing of the encapsulated crystal at the sealing cover.

In the above technical solution, preferably, the housing is further filled with two rigid gaskets sandwiching elastic gaskets.

Through the cooperation of the rigid spacer and the elastic spacer, the rigid spacer provides support for the crystal, and the elastic spacer is used to buffer the impact on the crystal, thereby greatly reducing the vibration of the lanthanum bromide crystal and further improving the shock resistance of the encapsulated crystal. .

In the above technical solution, preferably, the side of the housing facing the sealing cover is also filled with a silicone gasket and a retaining ring.

In the above technical solution, preferably, a high temperature glue is coated between the light guide glass and the crystal.

Compared with ordinary sealants, high-temperature adhesives are more viscous at high temperatures. By applying high-temperature adhesives between the light guide glass and the crystal, it can effectively prevent the sealing of the packaged crystals from being reduced at high temperatures, which will affect the experimental results.

The present invention also provides a well-logging high-temperature-resistant packaged lanthanum bromide crystal, including a crystal, a shell and a sealing cover, wherein:

The shell is a tubular structure with openings at both ends. Light guide glass is welded to the opening at one end, and threads are provided at the other end. The sealing cover is fixedly connected to the shell through the threads, thereby forming a housing for holding the The accommodating cavity of the crystal; the outside of the crystal is wrapped with tetrafluoro tape so that the crystal is only exposed to the side facing the light guide glass; the shell is an integrated structure; or, the shell is composed of a top cover and a sleeve The pipe is fixedly connected.

In the above technical solution, preferably, the sealing cover is coated with a high temperature resistant sealant.

By welding the light guide glass on the shell, the firmness of the connection between the light guide glass and the shell can be greatly improved, the light guide glass can be effectively prevented from falling off, and the strength of the package crystal and the sealing degree of the shell can be enhanced; the sealing cover and the sleeve can pass through The double fixing method of screw connection and sealant paste greatly improves the sealing degree of the packaged crystal.

In the above technical solution, preferably, two rigid gaskets interposing elastic gaskets are arranged between the sealing cover and the crystal.

In the above technical solution, preferably, the elastic gasket includes at least one of a wave spring and a disc spring.

In the above technical solution, preferably, the rigid gasket is an aluminum sheet.

In the above technical solution, preferably, the outer peripheral side of the top cover is provided with external threads.

Compared with the prior art, the present invention provides a logging high-temperature-resistant packaged lanthanum bromide crystal and its packaging method. By welding the light-guiding glass on the shell, the sealing strength of the place can be greatly improved, and the light-guiding glass can be avoided. It breaks when it is shaken. In addition, the tetrafluoro tape wound outside the crystal can also provide a good cushioning effect for the crystal; the sealing cover at the other end of the crystal and the crystal are filled with rigid gaskets and elastic gaskets. The sealing cover and the crystal are double-fixed by means of screw connection and sealing glue sticking, which not only improves the sealing effect of the packaged lanthanum bromide crystal, but also effectively plays a buffering effect, greatly reducing the vibration of the lanthanum bromide crystal possibility of fragmentation.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic cross-sectional structure schematic diagram of logging high temperature resistant encapsulation lanthanum bromide crystal of the present invention;

Fig. 2 is the structural exploded view of logging high-temperature resistant encapsulation lanthanum bromide crystal of the present invention;

Fig. 3 is a cross-sectional view of the second structure of the logging high temperature resistant packaged lanthanum bromide crystal of the present invention.

In the figure: 1. Crystal; 2. Top cover; 21. Light guide glass; 3. Sleeve; 4. Sealing cover; 5. Tetrafluoro tape; 6. Elastic gasket; 7. Rigid gasket; 8. Silicone pad ; 9, retaining ring.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in Figure 1, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred equipment or elements must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

The invention provides a method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging, comprising the following steps:

(1) Use tetrafluoro tape 5 to tightly wrap the crystal 1 so that only one side of the crystal 1 is exposed;

(2) welding the light guide glass 21 on the metal sealing tube so as to form a shell with an open end;

(3) Put the crystal 1 treated in step (1) into the casing in step (2), make the exposed side of the crystal 1 face the light guide glass 21, and at this time, the crystal 1 is closely attached to the inner wall of the casing;

(4) The sealing cover 4 is fixedly connected to the casing from the outlet of the casing, thereby encapsulating the crystal 1 .

Since the light guide glass 21 is fixed on the housing by welding, compared with the traditional method, the firmness of the connection between the light guide glass 21 and the housing is greatly improved, and the sealing degree and shock resistance of the packaged crystal are further improved. .

PTFE tape 5 has high compressibility, it is easy to fill the cavities and grooves on the sealing surface, block interface leakage, and has the characteristic of rebound and expansion when subjected to tension, so the higher the internal medium pressure, the higher the sealing force. bigger. In addition, PTFE tape 5 has excellent corrosion resistance and aging resistance, so it can be used safely for a long time in a wide temperature range, and it will not pollute the contacted fluid due to falling off. When using the PTFE tape 5, you only need to cut the PTFE tape 5 of the required length at one end, and then cross and overlap the two ends to form a sealing ring. The adhesive tape attached to one side of the PTFE tape 5 It can fix the PTFE tape 5 on the sealing surface of the equipment, that is, the outer surface of the crystal 1, to facilitate installation, and then only a small bolt tightening force (minimum pre-tightening force is 50Kgf/cm ² ) can form a good seal .

It should be noted that the shell is a tubular structure with openings at both ends, which can be directly processed into a single piece from a metal material, or can be processed into two annular columnar structures: the top cover 2 and the casing 3, and then the top cover 2 and sleeve 3 are fixedly connected by pasting.

As an optional implementation manner, the light-guiding glass 21 is sapphire, and sapphire has relatively high hardness and good light transmittance, so it is suitable for use as the light-guiding glass 21 in oil well logging.

As an optional embodiment, an internal thread is provided at the opening of the housing, and the sealing cover 4 is threadedly connected with the opening.

As an optional embodiment, the sealing cover 4 is recessed downward toward the middle of one side of the housing to form a cavity, and a sealant is coated in the cavity.

The sealing cover 4 and the shell are not only fixedly connected by threads, but also glued and connected by a sealant, which greatly improves the degree of sealing of the encapsulated crystal at the sealing cover 4 .

As an optional implementation, the housing is also filled with two rigid gaskets 7 sandwiching the elastic gasket 6 .

Through the mutual cooperation of the rigid spacer 7 and the elastic spacer 6, the rigid spacer 7 provides support to the crystal 1, and the elastic spacer 6 is used to buffer the impact of the crystal 1, thereby greatly weakening the vibration of the lanthanum bromide crystal 1, further The anti-seismic strength of the encapsulated crystal is improved.

As an optional embodiment, the side of the casing facing the sealing cover 4 is also filled with a silicone gasket 8 and a retaining ring 9 .

As an optional embodiment, a high temperature glue is coated between the light guide glass 21 and the crystal 1, and the high temperature glue can withstand a high temperature of 150-200°C.

Compared with ordinary sealants, the high-temperature glue is more viscous at high temperatures. By coating the high-temperature glue between the light guide glass 21 and the crystal 1, it can effectively prevent the sealing performance of the packaged crystal from being reduced at high temperatures, thereby affecting the experimental results.

The encapsulated lanthanum bromide crystal 1 processed by the above method has an outer diameter of 31 mm and a height of 149 mm. The sapphire welded on the shell has a diameter of 27 mm and a thickness of about 3.5 mm. The inner side of the sapphire and the crystal 1 are bonded together by high-temperature glue; The inner diameter of the shell is 27 mm, and the lanthanum bromide crystal 1 is wrapped in a tetrafluoro tape 5 and fixed inside the shell. The lower end of the shell is fixedly connected with the sealing cover 4 through threads. The sealing cover 4 is 7 mm high, and the lower end of the bottom surface is processed by knurling As shown in Figure 1.

The present invention also provides a lanthanum bromide crystal packaged with high temperature resistance for well logging, including a crystal 1, a casing and a sealing cover 4, wherein:

The shell is a tubular structure with openings at both ends. Light guide glass 21 is welded to the opening at one end, and threads are provided at the other end. The sealing cover 4 is fixedly connected with the shell through threads, thereby forming a housing chamber for receiving the crystal 1; 1 is wrapped with tetrafluoro tape 5 so that only the side of the crystal 1 facing the light guide glass 21 is exposed.

It should be noted that the outer casing of the device can be composed of a top cover 2 and a sleeve 3 fixedly connected, as shown in FIG. 1 ; it can also be an integral structure, as shown in FIG. 3 .

As an optional implementation, the sealing cover 4 is coated with a high temperature resistant sealant.

By welding the light guide glass 21 on the top cover 2, the light guide glass 21 can be effectively prevented from falling off, and the strength and sealing degree of the packaged crystal can be enhanced; the sealing cover 4 and the sleeve 3 are fixed through screw connection and sealant paste Fixed by way, greatly improving the degree of sealing of the packaged crystal.

It should be noted that in FIG. 1 , the top cover 2 and the casing 3 are fixedly connected by pasting with high-temperature glue, and the high-temperature glue can withstand high temperatures of 150-200°C.

As an optional embodiment, two rigid gaskets 7 sandwiching the elastic gasket 6 are arranged between the sealing cover 4 and the crystal 1 .

As an optional implementation manner, the elastic washer 6 includes at least one of a wave spring, a tower spring, and a disc spring.

Specifically, the elastic gasket 6 can also be made of elastic materials such as rubber, silicone, and polyurethane.

As an optional embodiment, the rigid gasket 7 is an aluminum sheet.

As an optional embodiment, the outer peripheral side of the top cover 2 is provided with external threads.

The specific information of the above-mentioned components for encapsulating the lanthanum bromide crystal is shown in FIG. 2 .

It should be noted that all the above-mentioned sealants or high-temperature glues need to be cured to achieve the sealing effect. The curing time is 12-18 hours, and the best curing time is 16 hours.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. A logging high temperature resistant encapsulation lanthanum bromide crystal encapsulation method, is characterized in that, comprises the following steps: (1) Use tetrafluoro tape to tightly wrap the crystal so that only one side of the crystal is exposed; (2) Weld the light guide glass on the metal sealing tube to form a shell with one end open; (3) Putting the crystal treated in step (1) into the shell in step (2), making the exposed side of the crystal face the light guide glass, at this time, the crystal is closely attached to the inner wall of the shell; (4) The sealing cover is fixedly connected to the shell from the outlet of the shell, thereby encapsulating the crystal. 2. The method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging according to claim 1, characterized in that the light guide glass is sapphire. 3 . The method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging according to claim 1 , wherein an internal thread is provided at the opening of the housing, and the sealing cover is threadedly connected with the opening. 4 . 4. The method for encapsulating lanthanum bromide crystals according to claim 3, characterized in that, the sealing cover is recessed toward the middle part of one side of the housing to form a cavity, and the cavity is coated with There is a sealant. 5 . The method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging according to claim 1 , wherein the casing is also filled with two rigid gaskets sandwiching elastic gaskets. 6 . 6 . The method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging according to claim 5 , wherein the side of the casing facing the sealing cover is also filled with a silica gel pad and a retaining ring. 7 . 7. The method for encapsulating lanthanum bromide crystals with high temperature resistance for well logging according to claim 1, characterized in that a high temperature glue is coated between the light guide glass and the crystals. 8. A well-logging high-temperature-resistant packaged lanthanum bromide crystal, characterized in that it includes a crystal, a casing and a sealing cover, wherein: The shell is a tubular structure with openings at both ends. Light guide glass is welded to the opening at one end, and threads are provided at the other end. The sealing cover is fixedly connected to the shell through the threads, thereby forming a housing for holding the accommodating cavity for the crystal; The outside of the crystal is wrapped with tetrafluoro tape so that only one side of the crystal is exposed toward the light-guiding glass; The shell is an integral structure; or, the shell is composed of a top cover and a sleeve fixedly connected. 9 . The well-logging high-temperature-resistant encapsulated lanthanum bromide crystal according to claim 8 , wherein two rigid gaskets interposing elastic gaskets are arranged between the sealing cover and the crystal. 10. The logging high temperature resistant packaged lanthanum bromide crystal according to claim 9, characterized in that the elastic gasket comprises at least one of a wave spring and a disc spring.