CN111927440B - Positive pulse generator - Google Patents
Positive pulse generator Download PDFInfo
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- CN111927440B CN111927440B CN202010816331.8A CN202010816331A CN111927440B CN 111927440 B CN111927440 B CN 111927440B CN 202010816331 A CN202010816331 A CN 202010816331A CN 111927440 B CN111927440 B CN 111927440B
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Abstract
The invention provides a positive pulse generator. The positive pulse generator comprises a shell, a solenoid valve assembly, a pressure transmission assembly, a supporting guide assembly and a pulse conversion assembly, wherein the solenoid valve assembly, the pressure transmission assembly and the pulse conversion assembly are all positioned in the shell and are sequentially arranged in the axial direction of the shell; the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly is connected with the pressure transmission assembly, the second pulse conversion assembly is located in the first pulse conversion assembly, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly. The positive pulse generator provided by the invention has higher stability.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a positive pulse generator.
Background
Today, Measurement While Drilling (MWD) and Logging While Drilling (LWD) techniques are widely used in oil exploration. MWD is a technique of installing a measurement tool at a suitable location in a drilling tool and measuring downhole information in real time while drilling; LWD requires a measurement while drilling tool with a more complex structure, has more various functions, and has greater advantages in the aspects of acquiring downhole information and evaluating strata. In actual drilling and production, data transmission of MWD and LWD is mainly classified into wireless transmission and wired transmission according to different transmission channels. The wireless transmission mode is widely applied, and the wireless transmission technology of the drilling fluid pressure pulse is commonly used in the wireless transmission mode. The performance of the mud pulse generator, which is used as a core part of measurement while drilling, is necessarily connected with the reliability and accuracy of data transmission, and in the mud pulse generator, the positive pulse generator is widely used in data transmission modes of MWD and LWD due to the advantages of stable signal transmission and high decoding efficiency.
The existing positive pulse generator is arranged in a cavity of a drill rod, drilling fluid is filled between the cavity of the drill rod and the positive pulse generator, the existing positive pulse generator generally comprises a shell, an electromagnetic valve, a hydraulic system, a pulse conversion device, a centering block, a power supply device and the like, the electromagnetic valve is positioned outside the shell, the hydraulic system, the pulse conversion device, the centering block and the power supply device are positioned in the shell, wherein the shell is an integrally formed shell, the power supply device is used for electrifying the electromagnetic valve, the pulse conversion device comprises a pulse valve and a current limiting ring, one end of the pulse valve is closed, the hydraulic system comprises a hydraulic valve component, a valve sleeve component and hydraulic oil, the hydraulic oil is filled in the valve sleeve component, a spring is arranged between the electromagnetic valve and the hydraulic valve component, the pulse conversion device is in sliding fit with the valve sleeve component, and when the power supply device supplies power to the electromagnetic valve, the electromagnetic valve and the hydraulic valve component are mutually exclusive, the hydraulic valve component is promoted to rise, so that the hydraulic oil pressure of the pulse valve is increased, the pulse valve is promoted to move upwards and abut against the flow restriction ring to generate positive pulse; when the power supply device stops supplying power to the electromagnetic valve, the electromagnetic valve loses power, the pressure of drilling fluid on the upper part of the pulse valve is increased under the action of the drilling fluid, the pulse valve is enabled to move downwards and is separated from the current-limiting ring, the hydraulic valve component descends and resets under the action of the elastic force of the spring, and the centering block plays a guiding role in guiding the movement of the hydraulic valve component.
Therefore, in the conventional positive pulse generator, the pulse is generated only by the pulse valve having one closed end, and the effect of the generated pulse is not good.
Disclosure of Invention
The embodiment of the invention provides a positive pulse generator which can optimize the pulse effect generated by the positive pulse generator.
The invention provides a positive pulse generator which comprises a shell, an electromagnetic valve component, a pressure transmission component, a supporting guide component and a pulse conversion component, wherein the electromagnetic component, the pressure transmission component and the pulse conversion component are all positioned in the shell and are sequentially arranged in the axial direction of the shell;
the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly is connected with the pressure transmission assembly, the second pulse conversion assembly is located in the first pulse conversion assembly, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly.
As an alternative embodiment, the second pulse conversion component is a pulse valve, and the pulse valve is cylindrical.
As an alternative embodiment, the support guide assembly includes a plurality of guide members distributed along an axial direction of the housing between the housing and at least one of the pressure transmission assembly and the pulse conversion assembly.
In an alternative embodiment, the guide member is an annular plate and has a first through hole.
As an alternative embodiment, the plurality of guides includes a first guide between the pressure transfer assembly and the housing and a second guide between the first pulse conversion assembly and the housing.
As an alternative embodiment, the pressure transfer assembly comprises:
the first guide piece is supported between the outer wall of the outer valve sleeve and the shell;
the outer valve sleeve is provided with a first cavity and a second cavity which are sequentially arranged along the axial direction of the shell, the first cavity is communicated with the second cavity through a first communicating hole, pressure liquid is arranged in the first cavity, and the pressure liquid can enter the second cavity along the first communicating hole; the first movable piece is movably positioned in the first cavity and is provided with a blocking part which can block the first communication hole; the first electromagnetic valve is used for driving the first movable piece to move so as to enable the blocking part to move away from the first communication hole;
the end of the second cavity, which is far away from the first cavity, is an open end, the pulse conversion assembly is connected with the open end, and the pulse conversion assembly is used for generating pulses under the action of pressure liquid entering the second cavity.
As an optional embodiment, the solenoid valve assembly further comprises a second solenoid valve disposed within the first chamber to regulate the pressure within the first chamber.
As an optional implementation manner, the first pulse conversion assembly includes an inner valve sleeve, a second movable member and a current-limiting ring, a first end of the inner valve sleeve is connected to the open end of the second cavity, a second end of the inner valve sleeve is provided with a second communication hole, a first end of the second movable member is located in the inner valve sleeve and can move under the pushing of pressure liquid, a second end of the second movable member extends out of the inner valve sleeve through the second communication hole, and a second guide member is supported between a second end of the second movable member and the housing;
the second end of the second movable member can abut against the flow restriction ring to isolate the space above the inner valve sleeve and the flow restriction ring.
As an optional implementation manner, the pulse conversion assembly further includes a pulse valve, the pulse valve is connected to the second end of the second movable member, the second movable member has a hollow cavity penetrating through the first end and the second end, and the pulse valve is in sliding fit with the hollow cavity.
As an alternative embodiment, the solenoid valve assembly further comprises a third solenoid valve, which is disposed inside the inner valve housing to regulate the flow direction of the pressure fluid inside the inner valve housing.
As an optional embodiment, the outer shell comprises a plurality of hollow short sections which are connected in sequence, and a sealing assembly is arranged between every two adjacent hollow short sections.
The invention provides a positive pulse generator which comprises a shell, an electromagnetic valve component, a pressure transmission component, a supporting guide component and a pulse conversion component, wherein the electromagnetic component, the pressure transmission component and the pulse conversion component are all positioned in the shell and are sequentially arranged in the axial direction of the shell; the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly is connected with the pressure transmission assembly, the second pulse conversion assembly is located in the first pulse conversion assembly, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly. The positive pulse generator provided by the invention is provided with the first pulse conversion component and the second pulse conversion component, so that double-stage pulses can be generated, and the pulse effect generated by the positive pulse generator provided by the invention can be improved.
The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1a is a schematic diagram of a usage state of a positive pulse generator according to an embodiment of the present invention;
FIG. 1b is an enlarged view of a portion of FIG. 1 a;
FIG. 1c is an enlarged partial schematic view of FIG. 1a at B;
FIG. 1d is an enlarged partial schematic view at C of FIG. 1 a;
FIG. 2a is a schematic diagram of another operating state of the positive pulse generator according to the embodiment of the present invention;
FIG. 2b is an enlarged partial view of FIG. 2a at D;
FIG. 2c is an enlarged partial schematic view at E in FIG. 2 a;
FIG. 2d is an enlarged partial schematic view at F of FIG. 2 a;
FIG. 3a is a schematic diagram of a first guiding element and a housing of a positive pulse generator according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of the second guiding element and the housing of the positive pulse generator according to the present invention;
FIG. 3c is a schematic diagram illustrating a mating relationship between a first supporting member and a housing of the positive pulse generator according to the embodiment of the present invention;
fig. 3d is a schematic diagram illustrating a fitting relationship between a second supporting member and a housing in the positive pulse generator according to the embodiment of the present invention.
Description of reference numerals:
1-a housing; 11-hollow nipple; 11 a-first nipple; 11 b-a second nipple; 111 a-a first connection; 111 b-a second connecting portion; 2-a solenoid valve assembly; 21-a first solenoid valve; 22-a second solenoid valve; 23-a third solenoid valve; 24-a fourth solenoid valve; 3-a pressure transfer assembly; 31-an outer valve sleeve; 311-a first cavity; 312 — a second cavity; 313 — a first via hole; 314-a blocking portion; 3141-a first tapered hole; 3142-second tapered hole; 32-a first movable member; 321-a first blocking portion; 322-a first stem portion; 323-a first piston portion; 324-a baffle; 33-a spring; 4-supporting a guide assembly; 41-a guide; 41 a-first guide; 41 b-a second guide; 411 — first via; 42-a support member; 42 a-a first support; 42 b-a second support; 42 c-a third support; 421-a second via; 422 a-groove; 43-closed chamber; 5-a first pulse conversion component; 51-an inner valve sleeve; 52-a second movable member; 521-a second stem portion; 522-a second piston portion; 523-second blocking part; 5231-a first conical portion; 5232-a second conical portion; 524-a hollow cavity; 5241-third cavity; 5242-fourth chamber; 525-an extension rod; 53-a restrictor ring; 54-pulse valve.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be noted that the terms "first" and "second" in the description of the present invention are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
In current petroleum exploration, Measurement While Drilling (MWD) and Logging While Drilling (LWD) technologies are widely applied, and compared with the traditional measurement technology, the MWD and LWD technologies have the greatest advantages that parameters fed back to the surface are more reliable and time-efficient, and data measured by the MWD and LWD technologies can more truly reflect the condition of a stratum close to a drill bit and can timely transmit the parameters to the surface.
MWD is a technique of installing a measurement tool at a suitable location in a drilling tool to measure downhole information in real time while drilling; LWD requires the use of measurement-while-drilling tools with more complex structures, which also have more diverse functions and have greater advantages in the aspects of obtaining downhole information and evaluating formations. In actual drilling and production, data transmission of MWD and LWD is mainly classified into wireless transmission and wired transmission according to different transmission channels. The wireless transmission mode is widely applied, and the wireless transmission technology of the drilling fluid pressure pulse is commonly used in the wireless transmission mode. The mud pulse generator is used as a core part of measurement while drilling, the performance of the mud pulse generator is inevitably connected with the reliability and accuracy of data transmission, and in the mud pulse generator, the positive pulse generator is widely used in data transmission modes of MWD and LWD due to the advantages of stable signal transmission and high decoding efficiency.
The existing positive pulse generator is arranged in a cavity of a drill rod, drilling fluid is filled between the cavity of the drill rod and the positive pulse generator, the existing positive pulse generator generally comprises a shell, an electromagnetic valve, a hydraulic system, a pulse conversion device, a centering block, a power supply device and the like, the electromagnetic valve is positioned outside the shell, the hydraulic system, the pulse conversion device, the centering block and the power supply device are positioned in the shell, wherein the shell is an integrally formed shell, the power supply device is used for electrifying the electromagnetic valve, the pulse conversion device comprises a pulse valve and a current limiting ring, one end of the pulse valve is closed, the hydraulic system comprises a hydraulic valve component, a valve sleeve component and hydraulic oil, the hydraulic oil is filled in the valve sleeve component, a spring is arranged between the electromagnetic valve and the hydraulic valve component, the pulse conversion device is in sliding fit with the valve sleeve component, and when the power supply device supplies power to the electromagnetic valve, the electromagnetic valve and the hydraulic valve component are mutually exclusive, the hydraulic valve component is promoted to rise, so that the hydraulic oil pressure of the pulse valve is increased, the pulse valve is promoted to move upwards and abut against the flow restriction ring to generate positive pulse; when the power supply device stops supplying power to the electromagnetic valve, the electromagnetic valve loses power, the pressure of drilling fluid on the upper portion of the pulse valve is increased under the action of the drilling fluid, the pulse valve is made to move downwards and separate from the current-limiting ring, the hydraulic valve component descends and resets under the action of spring elasticity, and the centering block plays a guiding role in moving the hydraulic valve component.
Therefore, the existing positive pulse generator has the following defects:
firstly, positive pulse is generated only through a pulse valve, so that the effect generated by a positive pulse generator is poor;
secondly, the movement of the hydraulic valve assembly is guided and supported only by the single centering block, so that the stability of the positive pulse generator is reduced;
thirdly, the electromagnetic valve is positioned outside the shell, so that the occupied space of the positive pulse generator can be increased;
and the shell is an integrally formed shell, so that the positive pulse generator is inconvenient to install.
The present invention thus provides a positive pulse generator that overcomes the above-mentioned drawbacks.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1a is a schematic diagram of a usage state of a positive pulse generator according to an embodiment of the present invention. Fig. 1b is a partially enlarged schematic view of a portion a in fig. 1 a. FIG. 1c is an enlarged view of a portion of FIG. 1a at B. Fig. 1d is a partially enlarged schematic view of C in fig. 1 a. Fig. 2a is a schematic diagram of another usage state of the positive pulse generator according to the embodiment of the present invention. Fig. 2b is an enlarged partial view of fig. 2a at D. Fig. 2c is a schematic enlarged view of a portion E of fig. 2 a. Fig. 2d is a schematic enlarged view of a portion F in fig. 2 a. Fig. 3a is a schematic diagram illustrating a fitting relationship between a first guide member and a housing in a positive pulse generator according to an embodiment of the present invention. Fig. 3b is a schematic diagram illustrating a fitting relationship between a second guiding element and a housing in the positive pulse generator according to the embodiment of the present invention. Fig. 3c is a schematic diagram illustrating a matching relationship between a first supporting member and a housing in the positive pulse generator according to the embodiment of the present invention. Fig. 3d is a schematic diagram illustrating a fitting relationship between a second supporting member and a housing in the positive pulse generator according to the embodiment of the present invention.
As shown in fig. 1a to 2d, an embodiment of the present invention provides a positive pulse generator, including a housing 1, a solenoid valve assembly 2, a pressure transmission assembly 3, a support guide assembly 4, and a pulse conversion assembly, where the solenoid assembly 2, the pressure transmission assembly 3, and the pulse conversion assembly are all located inside the housing 1 and are sequentially arranged in an axial direction of the housing 1, the housing 1 is connected to the pressure transmission assembly 3 through the support guide assembly 4, the solenoid valve assembly 2 includes a first solenoid valve 21, and the first solenoid valve 21 is configured to drive a part of components in the pressure transmission assembly 3 to move, so that pressure fluid in the pressure transmission assembly 3 drives the pulse conversion assembly to generate a pulse; the pulse conversion assembly comprises a first pulse conversion assembly 5 and a second pulse conversion assembly, the first pulse conversion assembly 5 is connected with the pressure transmission assembly 3, the second pulse conversion assembly is located in the first pulse conversion assembly 5, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly 5.
In the present embodiment, the second pulse conversion component is a pulse valve 54, and the pulse valve 54 is a cylindrical shape.
The pulse conversion assembly in the positive pulse generator provided by this embodiment includes the first pulse conversion assembly 5 and the second pulse conversion assembly, so that when the first solenoid valve 21 electrically drives part of the components in the pressure transmission assembly 3 to move upwards to cause the pulse conversion assembly to generate the positive pulse, under the combination of the first pulse conversion assembly 5 and the second pulse conversion assembly, two-stage pulses can be generated, which can avoid the problem of invalid generated pulses, thereby improving the effect of generating pulses by the positive pulse generator provided by this embodiment.
In order to improve the structural stability of the positive pulse generator and the stability thereof during operation, in the present embodiment, the supporting guide assembly 4 includes a plurality of guide members 41, and the guide members 41 are distributed between at least one of the pressure transmission assembly 3 and the first pulse conversion assembly 5 and the housing 1 along the axial direction of the housing 1.
In the positive pulse generator provided by this embodiment, the supporting and guiding assembly 4 includes a plurality of guiding members 41, and therefore, in the working process of the positive pulse generator provided by this embodiment, the plurality of guiding members 41 can play an effective supporting and guiding role on the pressure transmission assembly 3 and the first pulse conversion assembly 5, so as to improve the stability of the positive pulse generator provided by this embodiment in the working process.
Specifically, when the first electromagnetic valve 21 is powered, the first electromagnetic valve 21 generates a magnetic force to drive a part of components in the pressure transmission assembly 3 to move away from the first electromagnetic valve 21, so that the pressure fluid in the pressure transmission assembly 3 drives the first pulse conversion assembly 5 and the pulse valve 54 to generate a pulse.
In this embodiment, the pressure fluid is silicone oil, and the silicone oil has higher stability, so that the stability of the positive pulse generator provided by this embodiment can be improved.
In the positive pulse generator provided in the present embodiment, a power supply device for supplying power to the first electromagnetic valve 21 is further included. The power supply device may be a direct power supply device or an indirect power supply device, and the specific type of the power supply device is not particularly limited.
As shown in fig. 3a to 3d, in order to adapt the guide to the housing 1, in the present embodiment, the inner cavity of the housing 1 is a cylindrical cavity, and the guide 41 is an annular plate.
In order to make the drilling fluid flow between the housing 1 and the pressure transmission assembly 3 and the pulse conversion assembly, in the present embodiment, the guide member 41 has a plurality of first through holes 411 which penetrate the guide member 41 in the axial direction of the housing 1, so that the drilling fluid can flow between the housing 1 and the pressure transmission assembly 3 and the pulse conversion assembly.
In the present embodiment, the plurality of guides 41 includes a first guide 41a between the pressure transmission assembly 3 and the housing 1 and a second guide 41b between the first pulse conversion assembly 5 and the housing 1.
In this way, in the working process of the positive pulse generator provided by this embodiment, the first guide 41a can support the pressure transmission assembly 3, and the second guide 41b can support and guide the first pulse conversion assembly 5, so as to improve the stability of the positive pulse generator provided by this embodiment in working.
In some embodiments, the supporting and guiding assembly 4 further includes a plurality of supporting members 42, the supporting members 42 are distributed between the first solenoid valve 21 and the housing 1 along the axial direction of the housing 1, at least a portion of the pressure transmission assembly 3 is connected to at least one of the supporting members 42, the plurality of supporting members 42 form a closed cavity 43, and the first solenoid valve 21 is located in the closed cavity 43. Thus, the first electromagnetic valve 21 can be prevented from contacting the drilling fluid, and the usability of the first electromagnetic valve 21 can be improved.
In order to make the drilling fluid flow between the housing 1 and the first solenoid valve 21, in the present embodiment, the supporting member 42 has a plurality of second through holes 421 penetrating the supporting member 42 in the axial direction of the housing 1, so that the drilling fluid can flow between the housing 1 and the first solenoid valve 21. Specifically, the second through hole 421 corresponds to the first through hole 411.
In the present embodiment, the plurality of supporting members 42 include a first supporting member 42a, a second supporting member 42b and a third supporting member 42c, the first supporting member 42a, the second supporting member 42b and the third supporting member 42c are all connected in the casing 1, the second supporting member 42b is disposed between the first supporting member 42a and the third supporting member 42c, wherein the first supporting member 42a and the second supporting member 42b are both annular plates, the bottom of the pressure transmission assembly 3 penetrates through an inner hole of the first supporting member 42a, a closed cavity 43, that is, an inner hole of the second supporting member 42b, is enclosed between the first supporting member 42a, the second supporting member 42b and the third supporting member 42c, and the first electromagnetic valve 21 is mounted on the third supporting member 42 c.
In order to facilitate the installation of the positive pulse generator provided in this embodiment, the guide 41 and the support 42 may be screwed into the housing 1. It should be noted that other detachable connection methods, such as a snap connection, may be adopted between the guide 41 and the support 42 and the housing 1, and here, the connection methods between the guide 41 and the support 42 and the housing 1 are not particularly limited.
In some embodiments, the pressure transmission assembly 3 includes an outer valve housing 31 and a first movable member 32, the first guide member 41a is supported between an outer wall of the outer valve housing 31 and the housing 1, and the outer valve housing 31 is disposed on a first support member 42 a; the outer valve sleeve 31 is provided with a first cavity 311 and a second cavity 312 which are sequentially arranged along the axial direction of the housing 1, the first cavity 311 is communicated with the second cavity 312 through a first communicating hole 313, pressure liquid is arranged in the first cavity 311, and the pressure liquid can enter the second cavity 312 along the first communicating hole 313; the first movable member 32 is movably disposed in the first cavity 311, and the first movable member 32 has a first blocking portion 321 capable of blocking the first connection hole 313; the first solenoid valve is used for driving the first movable element 32 to move so that the first blocking portion 321 is removed from the first communication hole 313; the end of the second cavity 312 facing away from the first cavity 311 is an open end, and the first pulse conversion assembly 5 is connected to the open end, and is used for generating a primary pulse under the action of the pressure fluid entering the second cavity 312.
Specifically, when the first solenoid valve 21 is powered, the first movable element 32 is caused to move in the direction away from the first solenoid valve 21 in the outer valve sleeve 31, so that the first blocking portion 321 is removed from the first communication hole 313, and at this time, the pressure liquid in the first cavity 311 enters the second cavity 312 through the first communication hole 313, so that the pressure at the lower part of the first pulse conversion assembly 5 is increased, and the first pulse conversion assembly 5 moves upward to generate a positive pulse.
In a specific implementation manner of this embodiment, the first movable element 32 further includes a first rod portion 322, a first piston portion 323, and a baffle 324, the first rod portion 322 extends from the second cavity 312 to the enclosed cavity 43, the first blocking portion 321 is disposed at the top of the first rod portion 322, the first piston portion 323 is disposed on the middle section of the first rod portion 322, and the first blocking portion 321 and the first piston portion 323 are integrally formed with the first rod portion 322, the first piston portion 323 is in sliding fit with the first cavity 311, the baffle 324 is detachably disposed at the bottom end of the first rod portion 322, and the baffle 324 can abut against the first solenoid valve 21.
In a specific implementation manner of this embodiment, the first blocking portion 321 is a tapered structure, the blocking portion 314 is disposed on the upper end of the first communication hole 313 and the bottom wall of the second cavity 312, the blocking portion 314 is an annular plate, an inner hole of the blocking portion 314 includes a first tapered hole 3141 and a second tapered hole 3142, a small end of the first tapered hole 3141 communicates with a small end of the second tapered hole 3142, and an inner wall of the first tapered hole 3141 matches with an outer surface of the first blocking portion 321, when the first blocking portion 321 blocks the first communication hole 313, an outer wall surface of the first blocking portion 321 abuts against an inner wall of the first tapered hole 3141 to block the first communication hole 313.
In order to reset the first movable member 32 after the first electromagnetic valve 21 is de-energized, in the positive pulse generator of the present embodiment, the pressure transmission assembly 3 further includes a spring 33, the spring 33 is disposed on the first rod portion 322, and the spring 33 is located between the first supporting member 42a and the baffle 324. Specifically, the bottom of the first supporting member 42a is formed with a groove 422a having an inner diameter larger than the inner hole of the first supporting member 42a, one end of the spring 33 abuts against the bottom of the groove 422a, and the other end of the spring 33 abuts against the baffle 324.
Thus, when the first electromagnetic valve 21 is de-energized, the first movable element 32 is moved toward the first electromagnetic valve 21 by the elastic force of the spring 33, and when the bottom end of the baffle 324 abuts against the first electromagnetic valve 21, the first movable element 32 is reset.
In order to ensure the pressure balance between the inside and the outside of the first cavity 311, in this embodiment, the solenoid valve assembly 2 further includes a second solenoid valve 22, and the second solenoid valve 22 is disposed in the first cavity 311 to adjust the pressure in the first cavity 311.
In this way, the pressure in the outer valve sleeve 31 and the pressure in the housing 1 can be kept balanced, so that the stability of the positive pulse generator provided by the embodiment in operation can be improved.
In some embodiments, the first pulse conversion assembly 5 includes an inner valve housing 51, a second movable member 52 and a restrictor ring 53, a first end of the inner valve housing 51 is connected to the open end of the second chamber 312, the inner valve housing 51 is located in the second chamber 312, a second end of the inner valve housing 51 is provided with a second communication hole 511, a first end of the second movable member 52 is located in the inner valve housing 51 and can move under the pushing of the pressure fluid, a second end of the second movable member 52 extends out of the inner valve housing through the second communication hole 511, and a second guide member 41b is supported between the second end of the second movable member 52 and the housing; the second end of the second movable member 52 may abut the restrictor ring 53 to isolate the space above the inner valve sleeve 51 and the restrictor ring 53.
Specifically, when the first electromagnetic valve 21 is energized, the pressure at the lower portion of the second movable member 52 is increased, so that the second movable member 52 is urged to move upward relative to the inner valve sleeve 51 and the outer valve sleeve 31, and the second end of the second movable member 52 abuts against the restrictor ring 53, thereby isolating the space above the inner valve sleeve 51 and the restrictor ring 53 and generating a positive pulse.
In a specific embodiment of this embodiment, the second movable member 52 includes a second rod 521, a second piston 522 and a second blocking portion 523, the second piston 522 and the second blocking portion 523 are integrally connected to the second rod 521, the lower end of the second rod 521 extends into the inner valve sleeve 51, the upper end of the second rod 521 extends out of the second chamber 312, the second piston 522 is disposed on the middle section of the second rod 521, and the second piston 522 is slidably engaged with the second chamber 312, the second blocking portion 523 is disposed on the upper end of the second rod 521, and the second blocking portion 523 can abut against the inner hole of the restrictor ring 53 to isolate the space above the inner valve sleeve 51 and the restrictor ring 53, so as to generate a positive pulse.
In the present embodiment, the second blocking portion 523 includes a first tapered portion 5231 and a second tapered portion 5232, a large end of the first tapered portion 5231 is connected to a large end of the second tapered portion 5232, and the first tapered portion 5231 is located at an upper end of the second tapered portion 5232, in order to make the second blocking portion 523 abut on the current-limiting ring 53 after the first solenoid valve 21 is energized, in the present embodiment, the inner bore of the current-limiting ring 53 includes a third tapered bore 531 and a fourth tapered bore 532, the fourth tapered bore 532 is located at a lower end of the third tapered bore, a small end of the third tapered bore 531 and a small end of the fourth tapered bore 532 are communicated, and when the first solenoid valve 21 is energized, an outer wall surface of the first tapered portion 5231 abuts on an inner wall of the fourth tapered bore 532 to isolate a space above the inner valve housing 51 and the current-limiting ring 53, thereby generating a positive pulse.
In this embodiment, the pulse valve 54 is connected to the second end of the second movable member 52, the second movable member 52 has a hollow cavity 524 penetrating the first end and the second end, and the pulse valve 54 is slidably engaged with the hollow cavity 524.
Thus, when the first electromagnetic valve 21 is powered on, the pressure at the lower part of the pulse conversion assembly is increased, which not only can cause the second movable member 52 to move upwards, but also can cause the pulse valve 54 to move upwards, so that the positive pulse generator provided by the embodiment can generate two-stage pulses, the smoothness of pulse generation is ensured, and the pulse effect generated by the positive pulse generator provided by the embodiment is improved.
Specifically, the hollow cavity 524 includes a third cavity 5241 and a fourth cavity 5242, the third cavity 5241 is disposed in the second rod 521, the top end of the second rod 521 is connected with an extension rod 525, the fourth cavity 5242 is disposed in the extension rod 525, the inner diameter of the fourth cavity 5242 is greater than the inner diameter of the third cavity 5241, and the pulse valve 54 is in sliding fit with the fourth cavity 5242.
In order to ensure that the positive pulse generator of the present embodiment can perform directional flow of the pressure fluid when the pulse is generated or not generated, in the present embodiment, the solenoid valve assembly 2 further includes a third solenoid valve 23 and a fourth solenoid valve 24, the third solenoid valve 23 is disposed inside the inner valve housing 51 to adjust the flow direction of the pressure fluid inside the inner valve housing 51, and the fourth solenoid valve 24 is disposed inside the second movable member 52 to adjust the flow direction of the pressure fluid inside the hollow cavity 524.
Therefore, the pressure liquid can be ensured to flow directionally, and the pulse effect generated by the positive pulse generator provided by the embodiment is better.
In order to install the positive pulse generator provided by the present embodiment, in the present embodiment, the housing 1 includes a plurality of hollow short sections 11 connected in sequence, where the plurality of hollow short sections 11 include a first short section 11a located at the top and a second short section 11b located at the bottom, the top of the first short section 11a has a first connecting portion 111a, and the bottom of the second short section 11b has a second connecting portion 111 b.
In this embodiment, two adjacent hollow nipples 11 may be connected by a threaded connection. It should be noted that, other detachable connection methods may also be used to connect the two adjacent hollow short sections 11, for example, a connection method of a snap connection, where the connection method between the two adjacent hollow short sections 11 is not particularly limited.
In this embodiment, in order to improve the sealing performance between two adjacent hollow short sections 11, a sealing assembly is arranged between two adjacent hollow short sections 11, and the sealing assembly is arranged on any one hollow short section 11 of the two adjacent hollow short sections 11.
As an alternative embodiment of this embodiment, the sealing assembly comprises two sealing rings arranged one above the other.
As shown in fig. 1a to 1d, when the first solenoid valve 21 is energized, the bottom of the baffle 324 is urged to disengage from the first solenoid valve 21, and the first movable element 32 is moved upward to cause the first blocking portion 321 to separate from the blocking portion 314, the pressure fluid is caused to flow from the first chamber 311 into the second chamber 312 through the first communication hole 313, thereby increasing the pressure of the liquid located beneath the second moveable member 52, causing the second moveable member 52 to move upwardly, the second blocking portion 523 abuts on the inner hole of the restrictor ring 53, at this time, the second solenoid valve 22, the third solenoid valve 23 and the fourth solenoid valve 24 are energized, the flow direction of the pressure fluid and the fluid pressure inside the inner valve housing 51 are controlled, the pressure fluid flows upward, as the fluid pressure in the lower portion of the pulse valve 54 increases, the drilling fluid pressure in the upper portion of the pulse valve 54 decreases, causing the pulse valve 54 to move upward creating a positive pulse.
As shown in fig. 2a to 2d, after the first electromagnetic valve 21 is de-energized, the first movable element 32 moves downward under the action of the elastic force of the spring 33, at this time, the second electromagnetic valve 22, the third electromagnetic valve 23 and the fourth electromagnetic valve 24 are energized, the flow direction of the pressure fluid and the fluid pressure inside the inner valve housing 51 are controlled, the pressure fluid flows downward, the pressure fluid is caused to flow into the first cavity 311 from the second cavity 312 through the first communication hole 313, the fluid pressure below the second movable element 52 is reduced, the second movable element 52 moves downward, the second blocking portion 523 is caused to separate from the restrictor ring 53, the drilling fluid pressure above the pulse valve 54 is increased, the pulse valve 54 moves downward, and when the first blocking portion abuts against the inner hole of the blocking portion 314, the first movable element 32 resets.
The positive pulse generator provided by the embodiment comprises a shell, an electromagnetic valve assembly, a pressure transmission assembly, a supporting guide assembly and a pulse conversion assembly, wherein the electromagnetic assembly, the pressure transmission assembly and the pulse conversion assembly are all located in the shell and are sequentially arranged in the axial direction of the shell; the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly is connected with the pressure transmission assembly, the second pulse conversion assembly is located in the first pulse conversion assembly, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly. The positive pulse generator provided by the invention is provided with the first pulse conversion component and the second pulse conversion component, so that double-stage pulses can be generated, and the pulse effect generated by the positive pulse generator provided by the invention can be improved.
The embodiment also provides a measurement while drilling system, which comprises a detection unit, an encoding system, a decoding system and at least one positive pulse generator, wherein the detection unit is positioned underground, the encoding system is arranged in the detection unit, one end of the positive pulse generator is connected with the encoding system, and the other end of the positive pulse generator is connected with the decoding system; the detection unit is used for detecting and analyzing underground oil and gas characteristics, the coding system is used for converting data obtained by the detection unit into binary codes, the positive pulse generator converts the binary codes into pulse signals and transmits the pulse signals to the ground, and the decoding system on the ground converts the pulse signals into corresponding binary codes.
Specifically, when the measurement while drilling system provided by the present embodiment includes a plurality of positive pulse generators, between two adjacent positive pulse generators, the second connection portion 111b on one positive pulse generator is connected to the first connection portion 111a on the other positive pulse generator, so as to connect the two adjacent positive pulse generators.
It should be noted that the structure and specific implementation of the positive pulse generator have been described in detail in the above embodiments, and are not described herein again.
In this embodiment, the detection unit is a laser raman detection device, so that the detection result of the underground rock formation is more accurate.
In a specific implementation manner of this embodiment, when the laser raman detection apparatus transmits detection data of an underground oil reservoir through the positive pulse generator, and a signal sent by an encoding system in the laser raman detection apparatus is "1", the positive pulse generator generates a positive pulse; when the signal sent by the coding system is '0', the positive pulse generator does not generate positive pulse, and the ground decoding system decodes through the monitored pulse signal to obtain the detection data of the underground oil layer.
The measurement while drilling system provided by the embodiment comprises a detection unit, an encoding system, a decoding system and at least one positive pulse generator, wherein the detection unit is positioned underground, the encoding system is arranged in the detection unit, one end of the positive pulse generator is connected with the encoding system, and the other end of the positive pulse generator is connected with the decoding system; the detection unit is used for detecting and analyzing underground oil and gas characteristics, the coding system is used for converting data obtained by the detection unit into binary codes, the positive pulse generator converts the binary codes into pulse signals and transmits the pulse signals to the ground, and the decoding system on the ground converts the pulse signals into corresponding binary codes. The positive pulse generator comprises a shell, an electromagnetic valve assembly, a pressure transmission assembly, a supporting guide assembly and a pulse conversion assembly, wherein the electromagnetic assembly, the pressure transmission assembly and the pulse conversion assembly are all positioned in the shell and are sequentially arranged in the axial direction of the shell; the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly is connected with the pressure transmission assembly, the second pulse conversion assembly is located in the first pulse conversion assembly, and the second pulse conversion assembly is in sliding fit with the first pulse conversion assembly. The positive pulse generator provided by the invention is provided with the first pulse conversion component and the second pulse conversion component, so that double-stage pulses can be generated, the pulse effect generated by the positive pulse generator provided by the embodiment can be improved, the smoothness of the generated pulses is ensured, the decoding efficiency of a decoding system can be improved, the detection data can be effectively transmitted to the ground, and the accuracy of the detection effect of the measurement while drilling system can be improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A positive pulse generator is characterized by comprising a shell, a solenoid valve assembly, a pressure transmission assembly, a supporting guide assembly and a pulse conversion assembly, wherein the solenoid valve assembly, the pressure transmission assembly and the pulse conversion assembly are all positioned in the shell and are sequentially arranged in the axial direction of the shell, the shell is connected with the pressure transmission assembly through the supporting guide assembly, and the pressure transmission assembly comprises an outer valve sleeve and a first movable piece; the outer valve sleeve is provided with a first cavity and a second cavity which are sequentially arranged along the axial direction of the shell, the first cavity is communicated with the second cavity through a first communicating hole, pressure liquid is arranged in the first cavity, and the pressure liquid can enter the second cavity along the first communicating hole; the first movable piece is movably positioned in the first cavity and is provided with a first blocking part which can block the first communication hole;
the electromagnetic valve assembly comprises a first electromagnetic valve, and the first electromagnetic valve is used for driving the first movable member so that pressure liquid in the pressure transmission assembly drives the pulse conversion assembly to generate pulses;
the pulse conversion assembly comprises a first pulse conversion assembly and a second pulse conversion assembly, the first pulse conversion assembly comprises an inner valve sleeve, a second moving member and a current-limiting ring, the first end of the inner valve sleeve is connected to the opening end of the second cavity, the second end of the inner valve sleeve is provided with a second communication hole, the first end of the second moving member is located in the inner valve sleeve and can move under the pushing of the pressure liquid, and the second end of the second moving member extends out of the inner valve sleeve through the second communication hole; the second movable piece can be abutted against the flow limiting ring so as to isolate the space above the inner valve sleeve and the flow limiting ring;
the second pulse conversion assembly is positioned in the first pulse conversion assembly and is in sliding fit with the first pulse conversion assembly.
2. The positive pulser according to claim 1, wherein said second pulse transition assembly is a pulse valve and said pulse valve is cylindrical.
3. The positive pulser according to claim 2, wherein said support guide assembly comprises a plurality of guides distributed along an axial direction of said housing between said housing and at least one of said pressure transmission assembly and said pulse conversion assembly.
4. The positive pulse generator according to claim 3, wherein the guide is an annular plate, and the guide has a first through hole therein.
5. The positive pulser according to claim 4, wherein said plurality of guides comprises a first guide between said pressure transmission assembly and said housing and a second guide between said first pulse conversion assembly and said housing.
6. Positive pulse generator according to claim 5,
said first guide being supported between said outer housing outer wall and said outer housing;
the first electromagnetic valve is used for driving the first movable piece to move so as to enable the first blocking part to move away from the first communication hole;
the end, deviating from the first cavity, of the second cavity is an open end, the first pulse conversion assembly is connected with the open end, and the first pulse conversion assembly is used for generating pulses under the action of pressure liquid entering the second cavity.
7. The positive pulser according to claim 6, wherein the solenoid valve assembly further comprises a second solenoid valve disposed within the first chamber to regulate pressure within the first chamber.
8. The positive pulse generator as claimed in claim 5, wherein the second guide member is supported between the second end of the second movable member and the housing;
the pulse valve is connected at the second end of the second moving part, the second moving part is provided with a hollow cavity which penetrates through the first end and the second end, and the pulse valve is in sliding fit with the hollow cavity.
9. The positive pulser according to claim 8, wherein said solenoid valve assembly further comprises a third solenoid valve disposed within said inner valve housing for regulating the direction of pressurized fluid flow within said inner valve housing.
10. A positive pulse generator according to any one of claims 1 to 9, wherein the housing comprises a plurality of hollow nipples connected in series, and a sealing assembly is provided between two adjacent hollow nipples.
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| CN202010816331.8A CN111927440B (en) | 2020-08-14 | 2020-08-14 | Positive pulse generator |
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| CN202010816331.8A CN111927440B (en) | 2020-08-14 | 2020-08-14 | Positive pulse generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7735579B2 (en) * | 2005-09-12 | 2010-06-15 | Teledrift, Inc. | Measurement while drilling apparatus and method of using the same |
| CN2921275Y (en) * | 2006-07-17 | 2007-07-11 | 郑州士奇测控技术有限公司 | Rotary valve type slurry positive pulse generator |
| CN101294492B (en) * | 2007-04-29 | 2012-08-22 | 西部钻探克拉玛依钻井工艺研究院 | Slurry pulsator |
| CN101718195B (en) * | 2009-12-21 | 2013-05-08 | 北京中联博韬科技咨询有限公司 | Slurry pulse generator |
| CN101881158B (en) * | 2010-07-28 | 2013-01-09 | 哈尔滨工业大学 | Pipe fluid pressure pulse signal generator |
| CA2738271A1 (en) * | 2011-04-28 | 2012-10-28 | Sondex Wireline Ltd. | Measurement-while-drilling mud pulser and method for controlling same |
| US9702204B2 (en) * | 2014-04-17 | 2017-07-11 | Teledrill, Inc. | Controlled pressure pulser for coiled tubing measurement while drilling applications |
| CN103015990A (en) * | 2012-12-26 | 2013-04-03 | 西安思坦仪器股份有限公司 | Downhole mud positive pulse generator |
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