CN210888859U - Long shaft for coring tool - Google Patents

Long shaft for coring tool Download PDF

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Publication number
CN210888859U
CN210888859U CN201921801814.XU CN201921801814U CN210888859U CN 210888859 U CN210888859 U CN 210888859U CN 201921801814 U CN201921801814 U CN 201921801814U CN 210888859 U CN210888859 U CN 210888859U
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CN
China
Prior art keywords
flow passage
axis
shaft
coring
overflow
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Active
Application number
CN201921801814.XU
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Chinese (zh)
Inventor
李涵
谢勇
谢正森
赵云刚
江春华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Kangke Petroleum Technology Co ltd
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Sichuan Kangke Petroleum Technology Co ltd
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Priority to CN201921801814.XU priority Critical patent/CN210888859U/en
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Abstract

The utility model discloses a major axis that coring tool used, including the axis body, the axis body both ends are provided with coaxial runner and lower runner respectively, the runner is gone up and the lower runner does not communicate, the lower runner is close to the lower overflow path that the axis that runner one end was provided with axis and axis body has certain contained angle down, the runner is close to lower runner one end and is provided with the overflow path, the utility model discloses can reduce the resistance that the rock core got into a coring section of thick bamboo, make the rock core suspension in liquid, do not take place the autogenous grinding between the rock core, effectively improve the rock core rate of taking.

Description

Long shaft for coring tool
Technical Field
The utility model relates to a well drilling engineering technical field of oil and gas exploitation trade particularly, relates to a major axis that coring tool used.
Background
With the increasing demand of China on oil and gas resources and the rapid development of oil and gas industry, the oil and gas resources of shallow strata are continuously reduced, the current oil and gas drilling and production is continuously developed towards deep strata, and the number of deep ultra-deep wells is also continuously increased. In the process of oil and gas field exploration and development, the geological characteristics of the stratum of an exploration area are generally required to be known first, so that first-hand data can be mastered. By drilling a core in the stratum and analyzing the physical and mechanical characteristics of the core, the properties of the related stratum and the oil-gas layer can be predicted, and reliable basis is provided for formulating a reasonable development scheme, accurately calculating the reserves of the oil field and formulating yield-increasing measures. The oil-gas exploration operation range is wide, the quantity is large, so that the coring operation has a large demand, an important part, namely a long shaft, is arranged in the coring tool, the upper end of the long shaft is connected with a drill rod to transmit power to a coring barrel, the inner cavity is used for discharging rock debris and liquid in an inner barrel during coring, when the coring is not performed, fluid entering the long shaft cannot enter the coring barrel from the center of the long shaft due to the action of a steel ball, and the fluid enters an annular space between the coring barrel and the outer barrel from a radial flow passage of the long shaft and flows to the bottom of the well; during coring, fluid entering the long shaft still enters an annular space between the coring barrel and the outer barrel through the radial flow passage and flows to the bottom of the well, the core is cored by the coring bit, the fluid in the coring barrel pushes the steel ball open under the action of the core and is gradually discharged from the coring barrel, so that the space inside the coring barrel occupied by the fluid is gradually replaced by the core, and the coring process is finished; however, at present, the long shaft is directly communicated with the drill rod, the position of the steel ball has higher pressure, the steel ball can be jacked open by the higher pressure during coring, so that liquid and rock debris in the coring barrel are discharged, the resistance of a rock core entering the coring barrel is higher, the content of the coring barrel is easy to block, and the coring rate is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a major axis that coring tool was used can reduce the resistance that the rock core got into the coring section of thick bamboo, improves coring tool's the rhythm of the heart.
The embodiment of the utility model is realized like this: a long shaft for a coring tool comprises a shaft body, wherein an upper flow passage and a lower flow passage which are coaxial are arranged at two ends of the shaft body respectively, the upper flow passage and the lower flow passage are not communicated, a lower overflow passage with a certain included angle between the axis of the shaft body and the axis of the shaft body is arranged at one end, close to the upper flow passage, of the lower flow passage, and an upper overflow passage is arranged at one end, close to the lower flow passage, of the upper flow passage.
Furthermore, the number of the upper overflow channels is the same as that of the lower overflow channels, and the axes of the upper overflow channels and the axes of the lower overflow channels are on the same plane.
Further, the axis of the underflow channel is not perpendicular to the axis of the shaft body.
Further, the included angle between the axis of the underflow channel and the axis of the shaft body is 60 degrees.
Further, the axis of the upper overflow channel is perpendicular to the axis of the lower overflow channel.
Furthermore, a shaft shoulder is arranged above the long shaft, and bearings are arranged at the upper end and the lower end of the shaft shoulder.
Further, the bearing is a deep groove ball bearing.
The utility model has the advantages that: when not coring, because the upper flow passage and the lower flow passage are not communicated, the liquid entering the coring tool through the drill rod enters the annular space between the coring barrel and the outer barrel through the upper flow passage and the upper overflow passage and flows to the bottom of the well, and simultaneously enters the lower flow passage through the lower overflow passage and fills the lower flow passage, so that the liquid passing through the drill rod can not be directly contacted with the steel ball, and the pressure of the liquid above the steel ball is reduced; when coring, the fluid entering the long shaft still enters the annulus between the core barrel and the outer barrel through the upper flow passage and the upper overflow passage and flows to the bottom of the well, the core drilled by the coring bit enters the core barrel, the liquid in the core barrel is pressed to push the steel ball upwards and outwards discharge through the lower flow passage and the lower overflow passage of the long shaft, so that the inner space of the core barrel occupied by the liquid is gradually replaced by the core, the pressure born by the steel ball is smaller because the upper flow passage and the lower flow passage are not communicated with each other, the pressure for pushing the steel ball by the liquid in the core barrel is smaller, the resistance for the core to enter the core barrel is reduced, meanwhile, the liquid flowing out through the upper flow passage and the upper overflow passage has larger pressure and faster flow rate, the liquid at the lower overflow passage is adsorbed, the liquid flowing out in the lower flow passage is accelerated, negative pressure is generated in the lower flow passage, and the resistance for the core to enter the core barrel is, the rock cores are suspended in the liquid, no autogenous grinding occurs between the rock cores, and the rock core sampling rate is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a front view of a long shaft for a coring tool of the present invention;
FIG. 2 is a schematic view of the structure of the long shaft and the coring tool.
Reference numerals: 1-long shaft, 110-shaft body, 120-lower flow channel, 121-lower overflow channel, 130-upper flow channel, 131-upper overflow channel, 140-shaft shoulder, 2-deep groove ball bearing, 3-outer pipe joint, 4-bearing shell, 5-pressing cap, 6-back cap, 7-braking ring, 8-blocking wire, 9-inner pipe joint, 10-outer pipe, 11-coring barrel, 12-inner centering ring, 13-upper snap spring seat, 14-lower snap spring seat, 15-drill bit, 16-inner pipe short circuit, 17-centralizer and 18-steel ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
A long shaft for a coring tool comprises a shaft body 110, wherein an upper flow passage 130 and a lower flow passage 120 which are coaxial are respectively arranged at two ends of the shaft body 110, the upper flow passage 130 and the lower flow passage 120 are not communicated, a lower overflow passage 121 with a certain included angle between the axis of the lower flow passage 120 and the axis of the shaft body 110 is arranged at one end, close to the upper flow passage 130, of the lower flow passage 120, an upper overflow passage 131 is arranged at one end of the upper flow passage 130, close to the lower flow passage 120, the number of the upper overflow passages 131 is the same as that of the lower overflow passages 121, the axis of the upper overflow passages 131 and the axis of the lower overflow passages 121 are on the same plane, the upper overflow passages 131 and the lower overflow passages 121 are arranged in a one-to-one correspondence manner, so that the liquid adsorption force of the liquid flowing out through the upper overflow passages 131 on the; the axial line of the underflow channel 121 is not perpendicular to the axial line of the shaft body 110, the included angle between the axial line of the underflow channel 121 and the axial line of the shaft body 110 is 60 degrees, the axial line of the overflow channel 131 is perpendicular to the axial line of the underflow channel 121, a shaft shoulder 140 is arranged above the long shaft 1, bearings are arranged at the upper end and the lower end of the shaft shoulder 140, and the bearings are deep groove ball bearings 2.
The specific working principle is as follows: when not coring, because the upper flow passage 130 is not communicated with the lower flow passage 120, the liquid entering the coring tool through the drill rod enters the annular space between the coring barrel 11 and the outer barrel 10 through the upper flow passage 130 and the upper overflow passage 131 and flows to the bottom of the well, and simultaneously enters the lower flow passage 120 through the lower overflow passage 121 and fills the lower flow passage 120, so that the liquid passing through the drill rod can not directly contact the steel ball 18, and the pressure of the liquid above the steel ball 18 is reduced; during coring, the fluid entering the long shaft 1 still enters the annulus between the coring barrel 11 and the outer barrel 10 through the upper flow passage 130 and the upper overflow passage 131 and flows to the bottom of the well, the core drilled by the coring bit 15 enters the coring barrel 11, the liquid in the coring barrel 11 is pressed to upwards eject the steel ball 18 and is discharged outwards through the lower flow passage 120 and the lower overflow passage 121 of the long shaft 1, so that the inner space of the coring barrel 11 occupied by the liquid is gradually replaced by the core, because the upper flow passage 130 and the lower flow passage 120 are not communicated with each other, the pressure born by the steel ball 18 is small, the pressure of the liquid in the coring barrel 11 for ejecting the steel ball 18 is small, the resistance of the core entering the coring barrel 11 is reduced, and simultaneously, because the pressure of the liquid flowing out through the upper flow passage 130 and the upper overflow passage 131 is large and the flow speed is fast, the adsorption effect is generated on the liquid at the lower overflow passage 121, the liquid in the lower flow passage 120 is accelerated to flow out, the resistance of the core entering the core barrel 11 is further reduced, the core is suspended in liquid, autogenous grinding does not occur between the cores, and the core sampling rate is effectively improved.
A double-bearing set is arranged above the long shaft 1, and an upper bearing is a main single-action bearing and bears upward resistance of a rock core in the drilling process to play a single-action role; the lower bearing is an auxiliary bearing, and plays a single action role in the process of re-centering the drilling tool in a drawing state of the drilling tool, such as after core cutting in the drilling process. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The long shaft for the coring tool comprises a shaft body and is characterized in that an upper flow passage and a lower flow passage which are coaxial are arranged at two ends of the shaft body respectively, the upper flow passage and the lower flow passage are not communicated, a lower overflow passage with a certain included angle between the axis of the shaft body and the axis of the shaft body is arranged at one end, close to the upper flow passage, of the lower flow passage, and an upper overflow passage is arranged at one end, close to the lower flow passage, of the upper flow passage.
2. The long shaft for a coring tool of claim 1, wherein the number of the overflow channels is the same as the number of the underflow channels, and the axes of the overflow channels are in the same plane as the axes of the underflow channels.
3. The coring tool shaft of claim 2, wherein the axis of the underflow channel is non-perpendicular to the axis of the shaft.
4. The coring tool shaft of claim 2, wherein the axis of the underflow channel is at an angle of 60 ° to the axis of the shaft body.
5. The coring tool shaft of claim 3, wherein the axis of the overflow channel is perpendicular to the axis of the underflow channel.
6. The long shaft for the coring tool of any one of claims 1-5, wherein a shoulder is provided above the long shaft, and bearings are provided at both the upper and lower ends of the shoulder.
7. The long shaft for a coring tool of claim 6, wherein the bearing is a deep groove ball bearing.
CN201921801814.XU 2019-10-24 2019-10-24 Long shaft for coring tool Active CN210888859U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921801814.XU CN210888859U (en) 2019-10-24 2019-10-24 Long shaft for coring tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921801814.XU CN210888859U (en) 2019-10-24 2019-10-24 Long shaft for coring tool

Publications (1)

Publication Number Publication Date
CN210888859U true CN210888859U (en) 2020-06-30

Family

ID=71334669

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921801814.XU Active CN210888859U (en) 2019-10-24 2019-10-24 Long shaft for coring tool

Country Status (1)

Country Link
CN (1) CN210888859U (en)

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