Optical fiber ring structure for rotary guiding instrument and rotary guiding instrument

Abstract

The optical fiber ring structure comprises an optical fiber ring assembly arranged on a shell of the rotary guiding instrument in a sleeving mode, the optical fiber ring assembly is limited on the shell of the rotary guiding instrument, and the outer portion of the optical fiber ring assembly is sleeved with an outer cylinder. The outer cylinder is limited to be incapable of penetrating through the optical fiber ring assembly to move downwards; the optical fiber ring assembly comprises a ring support, an optical fiber ring and an upper cover, the ring support sleeves a shell of the rotary guiding instrument, a placement groove is formed in the side, away from the shell of the rotary guiding instrument, of the ring support, the upper cover covers the placement groove, and the optical fiber ring is placed in the placement groove between the ring support and the upper cover; the ring support and the upper cover are used for shielding interference of an external magnetic field on the optical fiber ring in the mounting groove. According to the optical fiber ring structure, the length of the optical fiber is increased, and the precision of the optical fiber is improved; the optical fiber ring structure provided by the invention has relatively good anti-interference capability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling engineering in the petroleum exploitation, drilling, drilling and geological exploration, and particularly relates to a fiber ring structure for a rotary steering instrument and the rotary steering instrument. BACKGROUND

[0002] The measurement-while-drilling instrument is an indispensable tool in the drilling engineering of fossil fuel of oil and natural gas, and the measurement-while-drilling instrument with a fiber-optic gyroscope has many advantages in the application in the drilling industry, such as good vibration resistance, less magnetic field change drift torque factor, less environmental temperature influence on work, etc. At present, the fiber-optic gyroscope for the measurement-while-drilling instrument is installed on the sidewall between the inner hole of the drill pipe and the outer cylinder, and the gyroscope diameter is generally required to be less than 40 mm.

[0003] However, the current rotary steering instrument does not have a fiber-optic component installed thereon, and the fiber-optic gyroscope of the existing measurement-while-drilling instrument cannot be directly applied to the rotary steering instrument due to the size problem, so it is urgent to set a fiber ring structure that can be applied to the rotary steering instrument. SUMMARY

[0004] In order to solve all or part of the above problems, the present application aims to provide a fiber ring structure for a rotary steering instrument and the rotary steering instrument. The fiber ring structure of the present application increases the length of the fiber and improves the accuracy of the fiber. The fiber ring structure of the present application can be used for the rotary steering instrument.

[0005] According to one aspect of the present application, a fiber ring structure for a rotary steering instrument is provided, which comprises a fiber ring component sleeved on the shell of the rotary steering instrument, the fiber ring component is limited on the shell of the rotary steering instrument, and the outer portion of the fiber ring component is sleeved with an outer cylinder body, which is limited and cannot move downward through the fiber ring component.

[0006] Further, the fiber ring component comprises a ring holder, a fiber ring and an upper cover, the ring holder is sleeved on the shell of the rotary steering instrument, the side of the ring holder away from the shell of the rotary steering instrument is provided with a placing groove, the upper cover covers the placing groove, the fiber ring is placed in the placing groove between the ring holder and the upper cover, and the ring holder and the upper cover are used to shield the interference of the external magnetic field on the fiber ring in the installation groove.

[0007] Further, the fiber ring is made of one fiber winding the bottom wall of the placing groove.

[0008] Further, the ring holder and the upper cover are made of one of ferrite material, magnetic alloy material or molybdenum metal material; or, surfaces of the ring holder and the upper cover are coated with a magnetic field isolation layer made of one of ferrite material, magnetic alloy material or molybdenum metal material.

[0009] Further, a step is arranged on the shell of the rotary steering instrument, and the fiber ring assembly is located above the step.

[0010] Further, a retaining wall is arranged on the shell of the rotary steering instrument above the fiber ring assembly, and the retaining wall is fixedly connected with the shell of the rotary steering instrument; an outer diameter of the retaining wall is greater than an outer diameter of the fiber ring assembly; an upper portion of the outer cylinder body is provided with a necked ring with an inner diameter smaller than the outer diameter of the retaining wall; the necked ring is located above the retaining wall; the outer cylinder body is limited from moving downward by cooperation of the necked ring and the retaining wall; and the outer cylinder body extends downward to be sleeved outside the fiber ring assembly.

[0011] Further, the retaining wall is fixedly connected with the shell of the rotary steering instrument by screws.

[0012] Further, a gap is formed between the fiber ring assembly and the retaining wall.

[0013] Further, two sealing structures are arranged between the shell of the rotary steering instrument and the outer cylinder body, and the fiber ring assembly is located between the two sealing structures.

[0014] The application further provides a rotary steering instrument, and a shell of the rotary steering instrument is provided with the fiber ring structure according to any one of the above.

[0015] According to the above technical solution, the fiber ring structure for the rotary steering instrument and the rotary steering instrument have the following beneficial effects:

[0016] The fiber ring structure increases the length of the fiber and improves the precision of the fiber.

[0017] The fiber ring structure has good anti-interference ability, can better resist the interference of an external magnetic field, minimizes the influence of the external magnetic field on the fiber ring and other modules of the rotary steering instrument, and thus guarantees the stability and reliability of the performance of the fiber ring structure and the rotary steering instrument. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 4 is a front view of a fiber ring assembly of an embodiment of the application after being installed on a shell of a rotary steering instrument;

[0019] Figure 2A cross-sectional structure schematic diagram of the fiber loop assembly of the embodiment of the present application after being installed on the housing of the rotary steering instrument;

[0020] Figure 3 A Figure 2 partial enlarged view at A in the middle;

[0021] Figure 4 A front view exploded structure schematic diagram of the fiber loop assembly of the embodiment of the present application and the housing of the rotary steering instrument;

[0022] Figure 5 Another front view exploded structure schematic diagram of the fiber loop assembly of the embodiment of the present application and the housing of the rotary steering instrument;

[0023] Figure 6 A Figure 5 partial enlarged view at B in the middle;

[0024] Figure 7 A perspective exploded structure schematic diagram of the fiber loop assembly of the embodiment of the present application and the housing of the rotary steering instrument;

[0025] Figure 8 Another front view exploded structure schematic diagram of the fiber loop assembly of the embodiment of the present application and the housing of the rotary steering instrument;

[0026] Figure 9 A Figure 8 partial enlarged view at C in the middle;

[0027] In the figure, the reference signs are: the housing 1 of the rotary steering instrument, a step 11, an outer cylinder 2, a necked ring 21, a fiber loop assembly 3, a fiber loop 31, a loop holder 32, an upper cover 33, a retaining wall 4, a screw 5. DETAILED DESCRIPTION

[0028] In order to better understand the purpose, structure and function of the present application, the following further describes in detail a fiber loop structure for a rotary steering instrument of the present application in combination with the drawings.

[0029] As Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8 shown, it shows a fiber loop structure for a rotary steering instrument of the embodiment of the present application, which comprises a fiber loop assembly 3 sleeved on the housing 1 of the rotary steering instrument, the fiber loop assembly 3 is limited on the housing 1 of the rotary steering instrument, the outer part of the fiber loop assembly 3 is sleeved with an outer cylinder 2, the outer cylinder 2 is limited to be unable to move downward through the fiber loop assembly 3.

[0030] The fiber optic ring structure of this embodiment includes a fiber optic ring assembly 3, which is fixed on the housing 1 of the rotary guide instrument, thereby realizing the application of the fiber optic ring on the rotary guide instrument; and the diameter of the fiber optic ring assembly 3 in this embodiment is larger than the diameter of the fiber optic gyroscope on the existing drilling measurement instrument. The diameter of the fiber optic ring assembly 3 in this embodiment is generally greater than 70 mm, or even larger.

[0031] In this embodiment, the outer cylinder is an external structural component. The purpose of setting the outer cylinder is to protect the fiber optic ring assembly 3 inside. The housing 1 of the rotary guide instrument is a hollow cylindrical structural component, and the fiber optic ring assembly 3 is fitted onto the housing 1 of the rotary guide instrument.

[0032] Among them, such as Figure 2 , Figure 3 As shown, the fiber optic ring assembly 3 includes a ring holder 32, a fiber optic ring, and a top cover 33. The ring holder 32 is fitted onto the housing 1 of the rotary guide instrument. A placement groove is provided on the side of the ring holder 32 away from the housing 1 of the rotary guide instrument. The top cover 33 covers the placement groove. The fiber optic ring is placed in the placement groove between the ring holder 32 and the top cover 33. The ring holder 32 and the top cover 33 are used to shield the fiber optic ring in the mounting groove from interference from external magnetic fields.

[0033] In this embodiment, the fiber optic ring assembly 3 consists of three parts: a fiber optic ring 31, a ring support 32, and a top cover 33. The fiber optic ring is an important optical component of the fiber optic gyroscope. It is located in the internal space formed by the ring support 32 and the top cover 33, that is, in the placement groove between the ring support 32 and the top cover 33. In this embodiment, the ring support 32 and the top cover 33 are used to shield the fiber optic ring in the mounting groove from interference from external magnetic fields.

[0034] The fiber optic ring 31 is made by winding a single optical fiber around the bottom wall of the placement groove, and the shape of the fiber optic ring 31 is ring-shaped. The fiber optic ring in this embodiment increases the length of the optical fiber and improves its precision; the fiber optic ring structure in this embodiment also gives it excellent market application prospects.

[0035] For the ring support 32 and the top cover 33, magnetic shielding materials are used, such as materials with superior magnetic permeability and magnetic saturation induction intensity, to shield the influence of external magnetic fields on the internal optical fiber ring.

[0036] Specifically, ferrite materials are an option due to their high permeability and magnetic saturation induction, which effectively isolates them from the influence of external magnetic fields. Soft magnetic alloys are also a candidate, possessing not only good magnetic permeability but also the ability to absorb the energy of external magnetic fields, reducing their influence range. Molybdenum metal, with its extremely high permeability, is another possible choice.

[0037] In specific implementation, for example, the ring holder 32 and the upper cover 33 are made of one of ferrite material, magnetic alloy material or molybdenum metal material; or, the surfaces of the ring holder 32 and the upper cover 33 are coated with a magnetic field isolation layer made of one of ferrite material, magnetic alloy material or molybdenum metal material.

[0038] Through reasonable selection and use of these magnetic shielding materials, the optical fiber ring assembly 3 of the embodiment has good anti-interference ability, can better resist the interference of external magnetic field, minimizes the influence of external magnetic field on the optical fiber ring and other modules of the rotary steering instrument, and further ensures the stability and reliability of the performance of the rotary steering instrument.

[0039] As shown in Figure 3 , the shell 1 of the rotary steering instrument is provided with a step 11, and the optical fiber ring assembly 3 is located above the step 11. The step 11 in the embodiment is provided to prevent the optical fiber ring assembly 3 from moving downward, thereby limiting the downward movement of the optical fiber ring assembly 3.

[0040] As shown in Figure 3 , a retaining wall 4 is sleeved on the shell 1 of the rotary steering instrument above the optical fiber ring assembly 3, the retaining wall 4 is fixedly connected with the shell 1 of the rotary steering instrument, the outer diameter of the retaining wall 4 is greater than the outer diameter of the optical fiber ring assembly 3, the upper part of the outer cylinder 2 is provided with a necked ring 21 with an inner diameter smaller than the outer diameter of the retaining wall 4, the necked ring 21 is located above the retaining wall 4, and the outer cylinder 2 is limited from moving downward by the cooperation of the necked ring 21 and the retaining wall 4, and the outer cylinder 2 extends downward to be sleeved outside the optical fiber ring assembly 3.

[0041] In the embodiment, the limiting of the outer cylinder 2 is realized by the cooperation of the necked ring 21 at the upper end of the outer cylinder 2 and the retaining wall 4, that is, the outer cylinder 2 can be hung on the retaining wall 4 through the necked ring 21, and the retaining wall 4 in the embodiment is provided to facilitate the arrangement of the outer cylinder 2, so as to protect the optical fiber ring assembly 3 in the outer cylinder 2.

[0042] The lower end of the outer cylinder 2 extends downward to cover the optical fiber ring assembly 3, and since the outer diameter of the retaining wall 4 is greater than the outer diameter of the optical fiber ring assembly 3, there is a gap between the outer wall of the optical fiber ring assembly 3 and the inner wall of the outer cylinder 2, so that the optical fiber ring assembly 3 does not directly contact the outer cylinder 2, thereby avoiding the influence of the deformation of the outer cylinder 2 caused by external force on the optical fiber ring assembly 3.

[0043] As shown in Figure 6 , Figure 9 , for example, the retaining wall 4 is fixedly connected with the shell 1 of the rotary steering instrument through a plurality of screws 5.

[0044] Again, there is a gap between the upper end of the optical fiber ring assembly 3 and the lower end of the retaining wall 4.

[0045] The shell 1 of the rotary steering instrument and the outer cylinder 2 are provided with two sealing structures, and the optical fiber ring assembly 3 is located between the two sealing structures.

[0046] For the sealing structure, a sealing ring mounting groove and a sealing ring cooperation structure are used, that is, a plurality of sealing ring mounting grooves are arranged on the shell 1 of the rotary steering instrument, and a corresponding sealing ring is arranged in each sealing ring mounting groove.

[0047] The sealing structure of the embodiment is arranged to locate the optical fiber ring assembly 3 between the two sealing structures.

[0048] The optical fiber ring assembly 3 of the embodiment can be applied to the rotary steering instrument, and the arrangement of the optical fiber ring assembly 3 of the embodiment enlarges the size of the optical fiber ring and increases the length of the optical fiber, thereby greatly improving the accuracy of the optical fiber ring.

[0049] The embodiment of the application also provides a rotary steering instrument, and the shell of the rotary steering instrument is provided with the optical fiber ring structure of any one of the above embodiments.

[0050] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the general meanings understood by the skilled in the art to which the present application belongs.

[0051] In addition, the terms "one", "two" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0052] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fiber optic ring structure for a rotary guiding instrument, characterized in that, The instrument includes an optical fiber ring assembly fitted onto the housing of a rotary guide instrument. The optical fiber ring assembly is positioned on the housing of the rotary guide instrument. An outer cylinder is fitted around the optical fiber ring assembly and is positioned to prevent it from moving downward through the optical fiber ring assembly.

2. The fiber optic ring structure for a rotary guiding instrument according to claim 1, characterized in that, The fiber optic ring assembly includes a ring holder, a fiber optic ring, and a top cover. The ring holder is fitted onto the housing of the rotary guide instrument. A placement groove is provided on the side of the ring holder away from the housing of the rotary guide instrument. The top cover covers the placement groove. The fiber optic ring is placed in the placement groove between the ring holder and the top cover. The ring holder and the top cover are used to shield the fiber optic ring in the mounting groove from interference from external magnetic fields.

3. The fiber optic ring structure for a rotary guiding instrument according to claim 2, characterized in that, The fiber optic ring is made by winding a single optical fiber around the bottom wall of the placement slot.

4. The fiber optic ring structure for a rotary guiding instrument according to claim 2, characterized in that, Both the ring support and the top cover are made of one of ferrite material, magnetic alloy material or molybdenum metal material; or, the surfaces of both the ring support and the top cover are coated with a magnetic field isolation layer made of one of ferrite material, magnetic alloy material or molybdenum metal material.

5. The fiber optic ring structure for a rotary guiding instrument according to claim 1, characterized in that, The housing of the rotary guide instrument is provided with a step, and the fiber optic ring assembly is located above the step.

6. The fiber optic ring structure for a rotary guiding instrument according to claim 5, characterized in that, A baffle wall is fitted onto the housing of the rotary guide instrument above the fiber optic ring assembly. The baffle wall is fixedly connected to the housing of the rotary guide instrument. The outer diameter of the baffle wall is larger than the outer diameter of the fiber optic ring assembly. A constricted ring with an inner diameter smaller than the outer diameter of the baffle wall is provided on the upper part of the outer cylinder. The constricted ring is located above the baffle wall. The outer cylinder is limited to not moving downward by the cooperation of the constricted ring and the baffle wall. The outer cylinder extends downward to fit over the fiber optic ring assembly.

7. The fiber optic ring structure for a rotary guiding instrument according to claim 6, characterized in that, The retaining wall is fixedly connected to the housing of the rotary guide instrument by a number of screws.

8. The fiber optic ring structure for a rotary guiding instrument according to claim 6, characterized in that, There is a gap between the fiber optic ring assembly and the retaining wall.

9. The fiber optic ring structure for a rotary guiding instrument according to claim 1, characterized in that, Two sealing structures are provided between the housing and the outer cylinder of the rotary guide instrument, and the fiber optic ring assembly is located between the two sealing structures.

10. A rotary guiding instrument, characterized in that, Its housing is provided with the fiber optic ring structure as described in any one of claims 1-9.

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