阅读说明：本技术 一种组合密封结构及随钻震击器 (Combined sealing structure and drilling jar ) 是由 闭磊 贺昶明 于 2021-11-22 设计创作，主要内容包括：本申请提供一种组合密封结构及随钻震击器,组合密封结构,包括：橡胶圈、隔离环以及导向环。橡胶圈具有安装面及密封面。安装面中段的部位向密封面一侧凹陷,密封面中段的部位呈凸起结构。隔离环有两片,分别设于橡胶圈两侧。导向环有两片,分别设于隔离环外侧,导向环截面为直角三角形结构。随钻震击器,包括芯轴以及壳体,还具有上述组合密封结构；芯轴的前端设有活塞,活塞的内壁与芯轴的外壁之间以及活塞的外壁与壳体的内壁之间设有至少一组所述组合密封结构。组合密封结构,便于安装,可有效防止橡胶圈受损；随钻震击器,可避免橡胶圈局部磨损,提高震击器使用寿命,且可有效防止杂质进入液压油。(The application provides a combination seal structure and jar while drilling, combination seal structure includes: rubber circle, spacer ring and guide ring. The rubber ring is provided with a mounting surface and a sealing surface. The middle section of the mounting surface is sunken towards one side of the sealing surface, and the middle section of the sealing surface is of a convex structure. The isolating ring has two pieces, which are respectively arranged at two sides of the rubber ring. The guide ring has two, locates the isolating ring outside respectively, and the guide ring cross-section is right triangle-shaped structure. The drilling jar comprises a mandrel and a shell, and also comprises the combined sealing structure; the front end of the mandrel is provided with a piston, and at least one group of combined sealing structure is arranged between the inner wall of the piston and the outer wall of the mandrel and between the outer wall of the piston and the inner wall of the shell. The combined sealing structure is convenient to install and can effectively prevent the rubber ring from being damaged; the jar can avoid rubber circle local wear along with boring, improves jar life, and can effectively prevent that impurity from getting into hydraulic oil.)

1. A composite seal structure for a jar seal, comprising: a rubber ring (11), a spacer ring (12) and a guide ring (13);

the rubber ring (11) is provided with a mounting surface (111) and a sealing surface (112);

when the rubber ring is used for inner wall sealing, the inner side surface of the rubber ring (11) is a sealing surface (112), and the outer side surface of the rubber ring is a mounting surface (111);

when the rubber ring is used for sealing the outer wall, the inner side surface of the rubber ring (11) is a mounting surface (111), and the outer side surface of the rubber ring is a sealing surface (112);

the part of the mounting surface (111) positioned at the middle section of the axis of the rubber ring (11) is sunken towards one side of the sealing surface (112), the part of the sealing surface (112) positioned at the middle section of the axis of the rubber ring (11) is of a convex structure, and the convex direction is the same as the sunken direction of the mounting surface (111);

the two isolating rings (12) are respectively arranged at two sides of the rubber ring (11), and the isolating rings (12) are made of resin;

the guide ring (13) has two, locates the isolating ring (12) outside respectively, and guide ring (13) cross-section is right triangle structure, and one right-angle side thereof is in contact with the terminal surface of isolating ring (12), and another right-angle side is in same side with sealed face (112) of rubber circle (11).

2. A combined seal according to claim 1, characterised in that when used for an inner wall seal, the outer diameter of the edge of the sealing face (112) in contact with the spacer ring (12) is smaller than the outer diameter of the spacer ring (12); when used for an outer wall seal, the inner diameter of the contact edge of the sealing surface (112) and the isolating ring (12) is larger than the inner diameter of the isolating ring (12).

3. A combined sealing structure according to claim 1, characterised in that the guide ring (13) is made of copper.

4. A combined sealing structure according to claim 1, characterised in that the rubber ring (11) is made of teflon.

5. A combined seal according to claim 1, characterised in that the spacer ring (12) and the guide ring (13) have the same outer and inner diameter.

6. A drill jar comprising a mandrel (2) and a housing (4), characterized by a composite seal structure according to any one of claims 1 to 5;

the front end of the mandrel (2) is provided with a piston (3), and at least one group of combined sealing structures are arranged between the inner wall of the piston (3) and the outer wall of the mandrel (2) and between the outer wall of the piston (3) and the inner wall of the shell (4);

at least one group of combined sealing structure is arranged between the outer wall of the rear end of the mandrel (2) and the inner wall of the shell (4);

and the outer wall of the rear end of the mandrel (2), the inner wall and the outer wall of the piston (3) are provided with limiting grooves (31) for mounting the combined sealing structure.

7. A drilling jar according to claim 6 wherein the limiting groove (31) is trapezoidal in cross-section, and the inclined surfaces of the guiding ring (13) have conical surfaces (311), and the inclined surfaces of the guiding ring (13) abut against the conical surfaces (311).

8. A drilling jar as claimed in claim 6 wherein the guide ring (13) comprises at least two circular segments, and wherein the adjacent end faces of the circular segments of the guide ring (13) abut one another during jarring operation.

9. A drilling jar according to claim 6 wherein the spacer ring (12) has at least one notch which breaks the spacer ring (12), the notch of the spacer ring (12) being circumferentially offset from the joint of adjacent circular arc sections of the guide ring (13) when assembled.

Technical Field

The invention belongs to the technical field of jar sealing and well drilling, and particularly relates to a combined sealing structure and a jar while drilling.

Background

In drilling operation, the drill string is often stuck, and the drilling jar is one of effective tools for eliminating the stuck drill accident. When the jar is required to be knocked upwards, enough pretension or pressure is applied to the ground, so that the mandrel of the jar generates impact force to form a shock, and the stuck drill column is separated from a stuck point through multiple shocks.

The existing drilling jar mainly has the following problems: (1) when the jar works, large hydraulic impact exists between the jar mandrel and the jar shell, the cross section of a sealing ring adopted between the two ends of the mandrel and the shell of the jar is usually a circular or rectangular structure at present, and the outer diameter of the sealing ring is usually larger than the inner diameter of the shell of the jar because the sealing ring needs to be compressed to form a sealing structure, so that the piston is difficult to install due to the structure; (2) the sealing ring of the existing jar is usually directly embedded in the outer wall of the piston, and the piston is made of metal with higher hardness, the sealing ring is usually made of rubber materials, and the sealing ring is easily crushed by the edge of the piston when being extruded, so that the sealing effect is reduced or lost; (3) when the bumper jar works, when the mandrel and the shell slide relatively, impurities easily enter a hydraulic oil cavity to cause hydraulic oil pollution and abrasion of a sealing ring, so that sealing failure is caused; (4) the piston is installed inside after jar shell, mainly rely on the sealing washer of week side to make and keep predetermined clearance between piston or the shells inner wall, in order to reduce metal parts direct contact, reduce the friction, and the sealing washer majority is rubber materials, it can't guarantee that the circumference receives everywhere the pressure is the same, can't guarantee that piston and dabber and jar shell are coaxial, long-term use causes the local wear of sealing washer week side too fast easily, lead to the unable normal work of jar, because the inspection discovery of being not convenient for, only can discover when losing sealed effect, lead to in time handling, the extension maintenance duration, this will cause great economic loss.

Disclosure of Invention

In order to solve the above-mentioned deficiency of the prior art at the same time, the invention provides a kind of combined seal structure and drilling jar, the combined seal structure, easy to install, can prevent the rubber ring from damaging effectively; the drilling jar with the combined sealing structure can ensure higher coaxiality between the core shaft and the shell, avoid local abrasion of the rubber ring, prolong the service life of the jar and effectively prevent impurities from entering hydraulic oil.

In order to realize the purpose of the invention, the following scheme is adopted:

a composite seal structure for a jar seal, comprising: rubber circle, spacer ring and guide ring.

The rubber ring is provided with a mounting surface and a sealing surface.

When the rubber ring is used for sealing the inner wall, the inner side surface of the rubber ring is a sealing surface, and the outer side surface of the rubber ring is a mounting surface.

When the rubber ring is used for sealing the outer wall, the inner side face of the rubber ring is a mounting face, and the outer side face of the rubber ring is a sealing face.

The part of the mounting surface, which is positioned in the middle section of the axis of the rubber ring, is sunken towards one side of the sealing surface, the part of the sealing surface, which is positioned in the middle section of the axis of the rubber ring, is of a convex structure, and the convex direction is the same as the sunken direction of the mounting surface.

The isolating ring has two pieces, which are set on two sides of the rubber ring separately and made of resin.

The guide ring has two, locates the isolating ring outside respectively, and the guide ring cross-section is right triangle structure, and one right-angle side contacts with the terminal surface of isolating ring, and another right-angle side is in same one side with the sealed face of rubber circle.

Further, when the sealing ring is used for inner wall sealing, the outer diameter of the contact edge of the sealing surface and the isolating ring is smaller than that of the isolating ring; when used for outer wall sealing, the inner diameter of the contact edge of the sealing surface and the isolating ring is larger than that of the isolating ring.

Further, the guide ring is made of copper.

Further, the rubber ring is made of polytetrafluoroethylene.

Furthermore, the outer diameter and the inner diameter of the isolation ring and the guide ring are the same.

A drilling jar comprises a mandrel and a shell, and also comprises the combined sealing structure;

the front end of the mandrel is provided with a piston, and at least one group of combined sealing structure is arranged between the inner wall of the piston and the outer wall of the mandrel and between the outer wall of the piston and the inner wall of the shell.

At least one group of the combined sealing structure is arranged between the outer wall of the rear end of the mandrel and the inner wall of the shell.

And the outer wall of the rear end of the mandrel, the inner wall and the outer wall of the piston are provided with limit grooves for installing the combined sealing structure.

Furthermore, the cross section of the limiting groove is of a trapezoidal structure, the inclined surfaces of the limiting groove corresponding to the guide ring are provided with conical surfaces, and the inclined surfaces of the guide ring are attached to the conical surfaces.

Furthermore, the guide ring is composed of at least two arc sections, and the adjacent end faces of the arc sections of the guide ring are mutually attached during the shock operation.

Furthermore, the isolating ring is provided with at least one notch, the isolating ring is disconnected by the notch, and the notch of the isolating ring and the joint of the adjacent arc section of the guide ring are staggered along the circumference during assembly.

The invention has the beneficial effects that:

1. the inclined plane is arranged on the sealing surface of the rubber ring, and the groove is formed in the mounting surface of the rubber ring, so that the rubber ring is more convenient to mount.

2. Through at the rubber circle, both ends set up the isolating ring, and the isolating ring adopts and intersects in the softer resin preparation of metal texture to play the purpose that prevents the rubber circle and damage. Meanwhile, by optimizing the structure of the contact part of the two sides of the sealing surface of the rubber ring and the isolating ring, the edge of the rubber ring can be prevented from entering the space between the isolating ring and the to-be-sealed piece, and the rubber ring is prevented from being damaged fundamentally.

3. The conical surface of the limiting groove is matched with the guide ring, and the piston, the mandrel and the shell of the jar are all in a coaxial state according to the principle of conical centering, so that the rubber ring has balanced pressure at each part of the circumference, the local abrasion of the rubber ring is avoided, and the service life of the jar is prolonged.

4. Utilize the circular conical surface of spacing groove to make the guide ring with wait to keep the laminating state between the sealing member, be favorable to getting rid of the impurity of adhering to on dabber outer wall and casing are inside, prevent that impurity from getting into hydraulic oil.

Drawings

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

FIG. 1 shows a structural cross-sectional view of a jar according to the present application.

Fig. 2 shows an enlarged view at a in fig. 1.

Fig. 3 shows an enlarged view at B in fig. 2.

Fig. 4 shows a structural cross-sectional view of the spindle and the bearing.

Figure 5 shows a cross-sectional view of a composite seal arrangement for an inner wall seal.

Figure 6 shows a cross-sectional view of the combined seal arrangement when used for an outer wall seal.

Fig. 7 shows a structural broken sectional view of the piston.

Fig. 8 shows a cross-sectional view of the composite sealing structure when mounted to the piston.

The labels in the figure are: rubber ring-11, mounting surface-111, sealing surface-112, isolating ring-12, guide ring-13, mandrel-2, piston-3, limiting groove-31, conical surface-311 and shell-4.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, but the described embodiments of the present invention are a part of the embodiments of the present invention, not all of the embodiments of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only for convenience of describing the present invention and simplifying the description. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

A composite seal structure for a jar seal, comprising: rubber ring 11, spacer ring 12 and guide ring 13.

Specifically, as shown in fig. 5 or 6, the rubber ring 11 has a mounting surface 111 and a sealing surface 112, and the mounting surface 111 and the sealing surface 112 are a circumferential inner wall or a circumferential outer wall of the rubber ring 11, respectively. The mounting face 111 faces the side for mounting the composite seal structure body part, and the sealing face 112 faces the side of the part to be sealed. The rubber ring 11 is preferably made of polytetrafluoroethylene.

More specifically, as shown in fig. 5, when used for inner wall sealing, the inner side face of the rubber ring 11 is a sealing face 112, and the outer side face thereof is a mounting face 111.

More specifically, as shown in fig. 6, when used for outer wall sealing, the inner side face of the rubber ring 11 is a mounting face 111, and the outer side face thereof is a sealing face 112.

For ease of understanding and description of the solution, hereinafter the part for mounting the composite sealing structure is defined as the body part and the sealing part cooperating with the body part is defined as the part to be sealed. The mounting surface 111 contacts the surface of the main body member, and the surface may be an arc inner surface or an arc outer surface. The sealing surface 112 contacts with the surface of the part to be sealed, when the mounting surface 111 contacts with the arc outer surface of the main part, the sealing surface 112 will contact with the arc inner surface of the part to be sealed, and the main part has an outer cylinder structure and the part to be sealed has an inner cylinder hole structure. When the mounting surface 111 contacts the inner surface of the arc of the body part, the sealing surface 112 will contact the outer surface of the arc of the seal to be sealed, the body part having an inner cylindrical configuration and the seal to be sealed having an outer cylindrical configuration.

More specifically, as shown in fig. 5 or 6, the mounting surface 111 is recessed toward the sealing surface 112 at a middle portion of the axis of the rubber ring 11, and the edge of the mounting surface 111 has a sharp-angled structure, so that it is easy to compress the mounting surface during assembly. After the sharp corner parts at the edges of the two sides of the mounting surface 111 are compressed, a surface contact structure is formed between the mounting surface 111 and the main part to ensure the sealing effect, and meanwhile, the sunken part of the mounting surface 111 is tightly attached to the surface of the main part, so that the mounting surface 111 is integrally attached to the main part to ensure the sealing property between the combined sealing structure and the main part.

More specifically, as shown in fig. 5 or fig. 6, the sealing surface 112 is in a convex structure at the middle section of the axis of the rubber ring 11, the convex direction is the same as the concave direction of the mounting surface 111, and both sides of the convex structure are inclined surfaces, so that the sealing surface can be conveniently compressed and assembled. When the rubber ring is installed, the inclined surface structure of the sealing surface 112 is used as a guide, so that the rubber ring 11 is easier to be installed into a to-be-sealed piece. After the sealing surface 112 contacts the surface to be sealed, the raised structure on the surface of the sealing surface 112 is flattened to increase the sealing surface and improve the sealing effect.

Specifically, the spacer ring 12 has two pieces, which are respectively disposed on both sides of the rubber ring 11, and the spacer ring 12 is made of resin, because the resin material is softer than the metal material, the rubber ring 11 can be prevented from being crushed when the rubber ring 11 contacts the spacer ring 12.

As shown in fig. 5, when used for sealing against the inner wall of the member to be sealed, the mounting face 111 has an inner diameter smaller than that of the spacer ring 12, and the sealing face 112 has an outer diameter larger than that of the spacer ring 12. As shown in fig. 6, when used for sealing the outer wall of the member to be sealed, the outer diameter of the mounting face 111 is larger than the outer diameter of the spacer ring 12, and the inner diameter of the sealing face 112 is smaller than the inner diameter of the spacer ring 12. So as to ensure that the mounting surface 111 has enough compression allowance and is tightly attached to the main part; the sealing surface 112 has enough compression allowance to ensure that the sealing surface 112 is tightly attached to the to-be-sealed member. The sealing effect is ensured.

Specifically, as shown in fig. 5 or fig. 6, the guide ring 13 has two pieces, which are respectively disposed outside the isolation ring 12 on both sides of the rubber ring 11, the cross section of the guide ring 13 is a right-angled triangle structure, one right-angled side of the guide ring is in contact with the end face of the isolation ring 12, and the other right-angled side of the guide ring is located on the same side as the sealing surface 112 of the rubber ring 11.

Preferably, as shown in fig. 5, when the combined sealing structure is used for sealing the inner wall of the member to be sealed, the outer diameter of the sealing surface 112, i.e. both a and b in fig. 5, is smaller than the outer diameter of the spacer ring 12, and the contact edge is in contact with the spacer ring 12. When the composite seal structure is used for an outer wall seal, as shown in FIG. 6, the seal face 112 contacts the edge of the spacer ring 12, both of which have an inside diameter greater than the inside diameter of the spacer ring 12, as shown at a, b in FIG. 6. Through the above structural design, the area of the two sides of the sealing surface 112 of the rubber ring 11 in contact with the isolating ring 12 is reduced, and after the rubber ring 11 is compressed, the part at the edge of the sealing surface 112 is clamped between the isolating ring 12 and the to-be-sealed piece and is damaged, so that the structural integrity of the rubber ring 11 is improved.

Preferably, the guide ring 13 is made of copper to prevent wear on the body parts, the seal to be sealed and the spacer ring 12.

Preferably, the spacer ring 12 and the guide ring 13 have the same outer diameter and inner diameter so as to prevent the rubber ring 11 from being damaged by the guide ring 13 when the rubber ring 11 is pressed and the edge of the spacer ring contacts the guide ring 13.

A drill jar, as shown in fig. 1-4, includes a mandrel 2 and a housing 4, and further has a composite seal structure as described above.

Specifically, as shown in fig. 2 to 4, a piston 3 is disposed at the front end of the mandrel 2, and at least one set of the combined sealing structure is disposed between the inner wall of the piston 3 and the outer wall of the mandrel 2 and between the outer wall of the piston 3 and the inner wall of the housing 4.

The piston 3 is slidably mounted on the mandrel 2, and when the total amount of hydraulic oil between the outer side of the middle section of the mandrel 2 and the housing 4 is reduced, the pressure will be reduced, and the piston 3 will move toward the front end of the mandrel 2 by itself to avoid the vacuum state.

As a preferred embodiment of the present application, as shown in fig. 8, two sets of combined sealing structures are provided on both the outer wall and the inner wall of the piston 3 in the axial direction. And the group sealing structures of the inner wall and the outer wall of the piston 3 are in one-to-one correspondence, and the two groups of combined sealing structures of the inner wall and the outer wall are respectively positioned on the same sections of the two positions of the piston 3. So as to ensure that the stress of the combined sealing structure at each position is more balanced.

As shown in fig. 3, the combined sealing structure arranged between the inner wall of the piston 3 and the outer wall of the mandrel 2 is realized by adopting the structure shown in fig. 6, and is used for realizing the sealing of the outer wall of the mandrel 2. At this time, the sealing surface 112 contacts the outer wall of the mandrel 2, the convex structure of the sealing surface 112 is compressed to form a sealing structure, and the mounting surface 111 contacts the inner wall of the piston 3.

As shown in fig. 3, the combined sealing structure of the mandrel 2 disposed between the outer wall of the piston 3 and the inner wall of the housing 4 is implemented by the structure shown in fig. 5, for implementing the inner wall sealing cover to the housing 4. The raised configuration of the sealing face 112 is compressed to form a seal and the mounting face 111 contacts the outer wall of the piston 3.

Two groups of combined sealing cover structures shown in fig. 5 are arranged between the outer wall of the rear end of the mandrel 2 and the inner wall of the shell 4 along the axis direction, and are used for realizing sealing between the outer wall of the mandrel 2 and the inner wall of the shell 4. The raised configuration of the sealing surface 112 is compressed to form a seal and the mounting surface 111 is in contact with the outer wall of the mandrel 2.

More specifically, as shown in fig. 7, the rear end of the mandrel 2 and the inner wall and the outer wall of the piston 3 are both provided with a limiting groove 31 for installing the combined sealing structure. To prevent the combined seal cap structure from moving in the axial direction.

Preferably, as shown in fig. 7 and 8, the cross section of the stopper groove 31 is trapezoidal, and the inclined surfaces of the guide ring 13 have conical surfaces 311, and the inclined surfaces of the guide ring 13 are attached to the conical surfaces 311.

When the jar works, the mandrel 2 pulls the piston 3 to move along the axial direction of the shell 4. As shown in fig. 3, when the bearing 3 moves upward relative to the mandrel 2, the conical surface 311 thereof located below the limiting groove 31 applies pressure to the guide ring 13 located at the lower portion of the combined seal structure. The pressure force is mainly divided into two directions, a first direction force along the axial direction of the piston 3, and a second direction force perpendicular to the axial direction of the piston 3. The force in the first direction and the force in the second direction are defined only for convenience of description.

The force in the second direction will cause the inner wall of the guide ring 13 located at the lower part of the combined sealing structure between the mandrel 2 and the piston 3 to cling to the outer wall of the mandrel 2. Because the conical surface 311 uniformly applies a force in the second direction to the circumference of the guide ring 13 along the circumference, the mandrel 2 and the piston 3 can be coaxial by the structure by utilizing the principle of conical centering, so that the stress at each part of the circumferential side of the rubber ring 11 is more uniform, and the local abrasion is avoided.

Similarly, the force in the second direction can keep the piston 3 and the housing 4 coaxial through the combined sealing structure between the piston 3 and the housing 4, so that the stress on each part of the periphery of the rubber ring 11 is more uniform, and the local wear is avoided.

Simultaneously, be direct contact between guide ring 13 and dabber 2 and the casing 4, the sharp corner structure at usable guide ring 13 border will be attached to the impurity on 2 outer walls of dabber and the inner wall of casing 4 and pushed away, further prevents that impurity from getting into the hydraulic oil intracavity of 2 middle parts of dabber to keep the cleanliness of hydraulic oil, improve jar knocker life.

Preferably, when the combined seal arrangement is used in a drill jar of the present application, the guide ring 13 is formed of at least two circular arc segments for ease of installation. When the jolt works, the mandrel 2 moves relative to the shell 4 along the axis direction, the conical surface 311 is utilized to simultaneously push the plurality of arc sections of the guide ring 13, the adjacent end surfaces of the arc sections of the guide ring 13 are mutually attached to form a sealing structure, so that hydraulic oil is prevented from being leaked, and impurities are prevented from entering the hydraulic oil. As a preferred embodiment of the present application, the guide ring 13 may be provided in a three-segment structure, and the arc lengths of the segments are the same. When in replacement, the three circular arc sections are replaced simultaneously in a complete set.

Preferably, when the combined sealing structure is used in the drilling jar of the present application, in order to facilitate installation, the isolation ring 12 has at least one notch, the notch breaks the isolation ring 12, and the notch of the isolation ring 12 and the joint of the adjacent arc segments of the guide ring 13 are staggered along the circumference during assembly, so as to improve the sealing effect.

The foregoing is only a preferred embodiment of the present invention and is not intended to be exhaustive or to limit the invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention.