阅读说明：本技术 一种取心率高的取心钻具及其工作方法 (Coring drilling tool with high coring rate and working method thereof ) 是由 江玉文 谢勇 谢正森 江春华 赵云刚 李涵 于 2019-10-24 设计创作，主要内容包括：本发明提供了一种取心率高的取心钻具,包括长轴,所述长轴靠近上流道一端设置有轴肩,所述轴肩上设置有轴承组,所述长轴下端外侧依次设置有背帽、制动环以及用于连接长轴和取心筒的内管接头,所述长轴与取心筒之间设置有堵丝,所述堵丝靠近长轴一端设置有钢球,所述长轴两端分别设置有与长轴轴线同轴的上流道和下流道,所述上流道和下流道不连通,所述下流道靠近上流道一端设置有轴线与上流道的轴线存在一定夹角的下溢出通道,所述上流道靠近下流道一端设置有上溢出通道,本发明能够减少岩心进入取心筒的阻力,使岩心悬浮在液体中,岩心之间不发生自磨,有效提高岩心采取率。(The invention provides a core drill with high core rate, which comprises a long shaft, wherein a shaft shoulder is arranged at one end of the long shaft close to an upper flow passage, a bearing group is arranged on the shaft shoulder, a back cap, a brake ring and an inner pipe joint for connecting the long shaft and a core barrel are sequentially arranged at the outer side of the lower end of the long shaft, a blocking wire is arranged between the long shaft and the core barrel, a steel ball is arranged at one end of the blocking wire close to the long shaft, an upper flow passage and a lower flow passage which are coaxial with the axis of the long shaft are respectively arranged at the two ends of the long shaft, 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 upper flow passage and the axis of the lower flow passage is arranged at one end of the upper flow passage close to the lower flow passage, the resistance of a core entering the core barrel can be reduced, effectively improving the core sampling rate.)

1. The utility model provides a coring drilling tool that rate of coring is high, includes the major axis, the major axis is close to runner one end and is provided with the shaft shoulder, be provided with the bearing group on the shaft shoulder, the major axis lower extreme outside has set gradually back of the body cap, brake ring and is used for connecting the inner tube connector of major axis and coring barrel, be provided with stifled silk between major axis and the coring barrel, stifled silk is close to major axis one end and is provided with the steel ball, its characterized in that, the major axis both ends are provided with respectively with major axis coaxial runner and lower runner, runner and lower runner does not communicate, lower runner is close to runner one end and is provided with the lower passageway that overflows that axis and last runner axis have certain contained angle, it is provided with the upper overflow passageway to go up runner one end of.

2. The high core rate core drill according to claim 1, wherein the number of overflow passages is the same as the number of underflow passages, and the axes of the overflow passages are in the same plane as the axes of the underflow passages.

3. The high core rate core drill of claim 2, wherein the axis of the underflow channel is non-perpendicular to the axis of the shaft.

4. A high core rate core drill according to claim 2 wherein the angle between the axis of the underflow channel and the axis of the shaft body is 60 °.

5. The high core rate core drill of claim 1, wherein the axis of the overflow channel is perpendicular to the axis of the underflow channel.

6. The high-coring-rate coring drilling tool as claimed in claim 1, wherein an outer pipe joint for connecting with a drill rod, a bearing housing for mounting a bearing connected with the outer pipe joint, and a pressing cap arranged inside the bearing housing for fixing the bearing, a blocking wire is arranged between the long shaft and the coring barrel, a steel ball is arranged at one end of the blocking wire close to the long shaft, a lower channel of the long shaft is communicated with the inside of the coring barrel through the blocking wire, an outer barrel is arranged outside the coring barrel, the lower end of the outer barrel is connected with a centralizer, the lower end of the coring barrel is sequentially connected with an upper clamp spring seat and a lower clamp spring seat through a short-circuit inner pipe, and a drill bit is arranged at the lower end of the centralizer.

7. The high core rate core drill of claim 6, wherein the bearing set comprises two deep groove ball bearings disposed on upper and lower sides of a shoulder.

8. The high core rate coring drill of claim 7, wherein an inner centering ring is disposed inside the centralizer.

9. The method of operating a high core rate core drill according to any one of claims 1 to 8, wherein: 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; during coring, fluid entering the long shaft still enters an 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, a core drilled by the coring bit enters the coring barrel, liquid in the coring barrel is pressed to upwards push the steel ball open and is outwards discharged through the lower flow passage and the lower overflow passage of the long shaft, so that the inner space of the coring barrel occupied by the liquid is gradually replaced by the core, and meanwhile, the pressure of the liquid flowing out through the upper flow passage and the upper overflow passage is higher, the flow speed is higher, and the liquid at the lower overflow passage is adsorbed.

Technical Field

The invention relates to the technical field of drilling engineering in the petroleum and gas exploitation industry, in particular to a core drilling tool with high core rate.

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.

Disclosure of Invention

The invention aims to provide a core drill with high core rate.

The embodiment of the invention is realized by the following steps: the utility model provides a coring drilling tool that rate of coring is high, includes the major axis, the major axis is close to runner one end and is provided with the shaft shoulder, be provided with the bearing group on the shaft shoulder, the major axis lower extreme outside has set gradually back of the body cap, brake ring and is used for connecting the inner tube connector of major axis and a section of thick bamboo of coring, be provided with stifled silk between major axis and the section of thick bamboo of coring, stifled silk is close to major axis one end and is provided with the steel ball, the major axis both ends are provided with respectively with the coaxial last runner of major axis and lower runner, go up runner and lower runner do not communicate, the lower runner is close to the lower passageway that overflows that the axis that last runner one end was provided with axis and last runner had certain contained angle.

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.

Further, the outer pipe joint is used for being connected with a drill rod, the bearing shell is connected with the outer pipe joint and used for installing a bearing, and the pressing cap is arranged inside the bearing shell and used for fixing the bearing.

Furthermore, the bearing set comprises two deep groove ball bearings which are respectively arranged on the upper side and the lower side of the shaft shoulder.

Further, an inner righting ring is arranged inside the centralizer.

The working method of the core drill with high core rate comprises the following steps: 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; during coring, fluid entering the long shaft still enters an 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, a core drilled by the coring bit enters the coring barrel, liquid in the coring barrel is pressed to upwards push the steel ball open and is outwards discharged through the lower flow passage and the lower overflow passage of the long shaft, so that the inner space of the coring barrel occupied by the liquid is gradually replaced by the core, and meanwhile, the pressure of the liquid flowing out through the upper flow passage and the upper overflow passage is higher, the flow speed is higher, and the liquid at the lower overflow passage is adsorbed.

The invention has the beneficial effects that:

(1) because the upper flow passage and the lower flow passage are not communicated with each other in the long shaft, the pressure born by the steel ball is smaller, the pressure for pushing the steel ball open by liquid in the core barrel is smaller, the resistance of the core to enter the core barrel is reduced, meanwhile, the pressure of the liquid flowing out through the upper flow passage and the upper overflow passage is larger, the flow speed is faster, the liquid at the lower overflow passage is adsorbed, the liquid flowing out in the lower flow passage is accelerated, the negative pressure is generated in the lower flow passage, the resistance of the core to enter the core barrel is further reduced, the core is suspended in the liquid, the self-abrasion does not occur between the cores, and the core sampling rate is effectively improved.

(2) Meanwhile, the bearing group adopts two bearings, and the upper bearing is a main single-action bearing and bears upward resistance of the 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.

(3) The centering ring is additionally arranged in the centering device, so that the centering effect is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

A core drill with high core-taking rate comprises a long shaft 1, wherein an upper flow passage 130 and a lower flow passage 120 which are coaxial with the axis of the long shaft 1 are respectively arranged at two ends of the long shaft 1, the upper flow passage 130 is not communicated with the lower flow passage 120, a lower overflow passage 121 of which the axis has a certain included angle with the axis of the upper flow passage 130 is arranged at one end of the lower flow passage 120 close to the upper flow passage 130, an upper overflow passage 131 is arranged at one end of the upper flow passage 130 close to the lower flow passage 120, the core drill further comprises an outer pipe joint 3 connected with a drill rod, a bearing shell 4 connected with the outer pipe joint 3 and used for mounting a bearing, and a gland 5 arranged inside the bearing shell 4 and used for fixing the bearing, a shaft shoulder 140 is arranged at one end of the long shaft 1 close to the upper flow passage 130, a bearing group is arranged on the shaft shoulder 140, a back cap 6, a brake ring 7 and an inner pipe joint 9 used, a wire blocking 8 is arranged between the long shaft 1 and the core barrel 11, a steel ball 18 is arranged at one end of the wire blocking 8 close to the long shaft 1, a lower flow passage 120 of the long shaft 1 is communicated with the interior of the core barrel 11 through the wire blocking 8, an outer barrel 10 is arranged outside the core barrel 11, the lower end of the outer barrel 10 is connected with a centralizer 17, the lower end of the core barrel 11 is sequentially connected with an upper clamp spring seat 13 and a lower clamp spring seat 14 through an inner pipe short circuit 16, a drill bit 15 is arranged at the lower end of the centralizer 17, the number of the upper overflow passage 131 is the same as that of the lower overflow passage 121, the axis of the upper overflow passage 131 and the axis of the lower overflow passage 121 are on the same plane, the axis of the lower overflow passage 121 is not perpendicular to the axis of the shaft body 110, the included angle between the axis of the lower overflow passage 121 and the axis of the shaft body 110 is 60 degrees, and the axis of the upper overflow passage, the bearing set comprises two deep groove ball bearings 2 which are respectively arranged at the upper side and the lower side of a shaft shoulder 140, and an inner centering ring 12 is arranged in the centering device 17.

The working method of the core drill with high core rate comprises the following steps: the working method of the core drill with high core rate comprises the following steps: 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, fluid entering the long shaft 1 still enters an 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, a core drilled by the coring bit 15 enters the coring barrel 11, liquid in the coring barrel 11 is pressed to be upwards pushed open, the steel ball 18 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, meanwhile, the pressure of the liquid flowing out through the upper flow passage 130 and the upper overflow passage 131 is higher, the flow speed is higher, the liquid at the lower overflow passage 121 is adsorbed, after the core with the required length is obtained, the coring bit 15, the centralizer 17 and the clamp spring seat are sequentially detached, and the core is taken out.

Because the upper flow passage 130 and the lower flow passage 120 in the long shaft 1 are not communicated with each other, the pressure born by the steel ball 18 is smaller, the pressure of liquid in the core barrel 11 for ejecting the steel ball 18 is smaller, the resistance of a rock core entering the core barrel 11 is reduced, meanwhile, the pressure of the liquid flowing out through the upper flow passage 130 and the upper overflow passage 131 is larger, the flow rate is faster, the liquid at the position of the lower overflow passage 121 is adsorbed, the liquid flowing out in the lower flow passage 120 is accelerated, negative pressure is generated in the lower flow passage 120, the resistance of the rock core entering the core barrel 11 is further reduced, the rock core is suspended in the liquid, autogenous grinding does not occur between the rock cores, and the rock core sampling rate is effectively improved; meanwhile, the bearing group adopts two bearings, and the upper bearing is a main single-action bearing and bears upward resistance of the 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; a righting ring is additionally arranged in the centralizer 17, so that the righting effect is further improved.

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.