CN210622746U - Double-layer inner cylinder shape-preserving coring tool - Google Patents

Abstract

The utility model discloses a double-deck inner tube shape preserving coring tool, it belongs to well drilling coring technical field. The utility model comprises an outer cylinder and the like; the second rotating assembly comprises a second half ring, a second bearing piece, a second bearing box and a suspension component, the second half ring and the second bearing piece are sleeved on the outer side wall of the suspension component, the second half ring is abutted against the upper portion of the second bearing piece, and the second bearing box is covered on the outer side of the second bearing piece and is connected with the mandrel at the upper portion. The lower part of the suspension assembly is detachably connected with at least two arc-shaped inner cylinders through fixing pieces, and the arc-shaped inner cylinders are positioned on the same circumference; a gap is formed between the adjacent arc-shaped inner cylinders and is used for discharging crushed slag and rock debris. The utility model has the advantages that by arranging the double-bearing double-inner-cylinder structure, the rock cores can be classified and collected, and the working efficiency is improved; the multi-stage rotation stopping mechanism is arranged, the problems of core grinding, mechanical collision and the like can be better avoided, the coring is convenient and fast, the core rate is obviously improved, and the core integrity is excellent.

Description

Double-layer inner cylinder shape-preserving coring tool

Technical Field

The utility model belongs to the technical field of well drilling coring, especially, relate to a double-deck inner tube shape preserving coring tool.

Background

The core is a rock sample which is obtained by taking out underground rock through equipment such as a coring tool and the like for research, analysis and assay of researchers. The core is mainly used for researching strata, oil-gas layers and oil-producing layers, so that drilling and coring are important ways for providing underground original resources, and are direct means for acquiring information of strata lithology, oil-containing conditions and the like, and in order to accurately acquire the information of the underground original resources, the core is required to be ensured not to be damaged, and a complete core is acquired.

However, in current oilfield development, there are many problems with the protection and acquisition of cores: 1. when the drilling tool rotates, the outer cylinder drives the coring bit to rotate, the inner cylinder achieves the purpose of non-rotation through the suspension device and the rotary assembly, but in downhole operation, the problem that the rotary assembly is clamped may occur, or when the viscosity of drilling fluid is too high, mud cakes on the inner wall of the outer cylinder are too thick, the mud cakes gradually adhere the inner cylinder and the outer cylinder together, and the rock core stored in the inner cylinder and the inner cylinder wall are mechanically collided under the two conditions, so that the rock core is damaged; 2. no matter cable coring or inner and outer barrel simultaneous tripping coring in the existing drilling process, the inner barrel needs to be lifted to the ground, the rock core claw assembly is lifted, the rock core is poured out from the inner barrel, but when a broken stratum is drilled, more rock debris and broken slag can be remained in the inner barrel, the core is blocked and abraded, the rock core can be taken out only by knocking the oscillation inner barrel, so that impact damage can be caused to the rock core, the rock core is broken into sections or broken, the more serious condition can even occur that the rock core blocked in the inner barrel is still difficult to loose by knocking the inner barrel, the intact rock core is difficult to obtain, and the working efficiency is also lower.

SUMMERY OF THE UTILITY MODEL

Technical purpose

Not enough to above-mentioned prior art, the utility model provides a double-deck inner tube shape preserving coring tool aims at solving the problem that is difficult to gain intact rock core among the drilling process to improve work efficiency.

(II) technical scheme

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a double-deck inner tube shape preserving coring tool, includes safety joint, urceolus, first rotatory assembly, inner tube, rock core claw subassembly and coring bit, and outer tube and first rotatory assembly are connected respectively to the safety joint, and the inner tube suit is in the urceolus and inner tube upper portion is connected with first rotatory assembly, leaves the clearance that is used for the drilling fluid circulation between urceolus and the inner tube, and rock core claw subassembly is connected to the inner tube bottom, and coring bit is connected to the urceolus bottom. In the drilling process, the drilling fluid must be circulated to cool, take away impurities at the well bottom, and realize the functions of consolidating the well wall, etc., and the drilling fluid enters through the gap between the inner cylinder and the outer cylinder and returns to the ground through the gap between the outer cylinder and the outer sleeve; after the underground footage reaches the expected range, the core claw assembly cuts off the core by lifting the drilling tool, and the jaw opening of the core claw is provided with a wedge-shaped block structure, so that the cut core column can be supported in the process of tripping.

The first rotating assembly comprises a first half ring, a first bearing piece, a first bearing box and a mandrel, the first half ring and the first bearing piece are sleeved on the outer side wall of the mandrel, the first half ring is abutted against the upper part of the first bearing piece, the first bearing box is sleeved on the outer side of the first bearing piece, and the upper part of the first bearing box is connected with the safety joint; the mandrel is provided with a circulation hole which is communicated with a gap between the outer cylinder and the inner cylinder and used for circulating drilling fluid; the lower part of the mandrel is connected with the inner cylinder. First bearing spare is by first semi-ring, first bearing box and mandrel surround, play stable spacing effect to first bearing spare, first bearing box can produce the rotation in a circumferential direction around first bearing spare, its specific functional effect does, drive urceolus and linkage coring bit when the safety joint rotation, thereby realize advancing in the pit, and the safety joint drives first bearing box circumferential direction on first bearing spare, because the effect of first bearing spare again, avoid the mandrel along with rotating, then the mandrel can not drive the inner tube rotation of downside, thereby can not appear grinding the heart, take place mechanical collision's problem with the rock core.

The upper part of the mandrel is open, the inside of the mandrel is hollow, and drilling fluid flows into the mandrel from an upper drilling tool and then flows into a gap between the inner barrel and the outer barrel through the through hole.

The double-layer inner cylinder conformal coring tool further comprises a second rotating assembly, the second rotating assembly comprises a second half ring, a second bearing piece, a second bearing box and a suspension component, the second half ring and the second bearing piece are sleeved on the outer side wall of the suspension component, the second half ring is abutted against the upper portion of the second bearing piece, the second bearing box is covered on the outer side of the second bearing piece, and the upper portion of the second bearing box is connected with the mandrel. The second bearing piece is by the second semi-ring, second bearing box and hang the subassembly and surround, play stable spacing effect to the second bearing piece, the second bearing box can produce the rotation in a circumferential direction around the second bearing piece, the effect of the rotatory assembly of second does, it weakens or even when inefficacy to spline the function at first rotatory assembly, though the mandrel can drive the inner tube and rotate this moment, but can avoid the rotation of mandrel linkage second bearing box and drive and hang the subassembly, it does not rotate then can not drive the arc inner tube rotation of its downside to hang the subassembly, can continue to ensure that the heart abrasion can not appear, take place mechanical collision's problem with the rock core.

The lower part of the suspension assembly is detachably connected with at least two arc-shaped inner cylinders through fixing pieces, and the arc-shaped inner cylinders are positioned on the same circumference; and a gap is formed between every two adjacent arc-shaped inner cylinders and is used for discharging core slag and rock debris. During coring, the suspension assembly can be detached, the fixing piece is taken down, the arc can be detached from the suspension assembly, then the whole rock core column can be directly taken out, the inner tube wall does not need to be knocked, the intact rock core is favorably acquired, and the coring operation is convenient and simple.

Further, the top of the safety joint is provided with a first thread protecting sleeve used for protecting the top thread of the safety joint.

Further, the bottom of the safety joint is provided with an adjusting part, the first bearing box is connected with the adjusting part, and the connecting position of the first bearing box can be adjusted in the adjusting part so as to adjust the distance between the core gripper assembly and the core bit. Specifically, the connecting position of the first bearing box and the adjusting part is adjusted downwards, so that the distance between the core claw assembly and the core drill bit can be shortened, and the core claw assembly is suitable for soft strata; the connecting position of the first bearing box and the adjusting part is adjusted upwards, so that the distance between the core gripper assembly and the core bit can be increased, and the core gripper assembly is suitable for harder strata. To sum up, the utility model discloses can adapt to the lithology condition in different stratum.

Furthermore, the adjusting part is sequentially sleeved with a pressing cap, a braking ring and an adjusting nut from top to bottom, the braking ring is clamped between the pressing cap and the adjusting nut, and the lower part of the adjusting nut is connected with the first bearing box. The pressing cap, the braking ring, the adjusting nut and the mandrel play a role in mutual braking, and the adjusting nut and the mandrel can be prevented from rotating relatively.

Furthermore, a back pressure valve seat is arranged at the top of the suspension assembly and used for placing a sealing ball to seal the inner cavity of the inner barrel. The upper part of the suspension assembly is opened, the suspension assembly is hollow, and in actual operation, before drilling and coring, sealing well fluid is not thrown into the well and can enter the inner cylinder through a back pressure valve seat of the suspension assembly, so that the well bottom is washed, and the inner cavity of the inner cylinder can be cleaned; when core drilling is required, a sealing ball is thrown in, falls on the back pressure valve seat, the top end of the suspension assembly is sealed, the inner cavity of the inner barrel is sealed, and drilling fluid only enters a gap between the inner barrel and the outer barrel from a circulation hole of the mandrel and cannot enter the inner barrel again.

Further, a second thread protecting sleeve is arranged at the bottom of the outer barrel and used for protecting bottom side threads of the outer barrel.

Further, an upper stabilizer is arranged between the safety joint and the outer cylinder; the lower part of the outer barrel is connected with a lower stabilizer, and the lower part of the lower stabilizer is connected with the second thread protecting sleeve. The upper stabilizer and the lower stabilizer can keep the outer cylinder and the coring bit to work stably, and are favorable for preventing well deviation.

Further, the fixing member is a pin.

Furthermore, the arc inner cylinder is divided into two blocks. Of course, the arcuate inner barrel can be other numbers.

(III) advantageous effects

Compared with the prior art, the beneficial effects of the utility model reside in that: by the double-bearing double-inner-cylinder structural form, the rock cores can be collected in a classified mode, and the working efficiency is improved; the multi-stage rotation stopping mechanism is arranged, the problems of core grinding, mechanical collision and the like can be better avoided, the core taking is convenient and fast, the core rate of the drilling well is obviously improved, and the core integrity is excellent.

Drawings

Fig. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic view of the upper section of the present invention;

FIG. 3 is a schematic front view of the lower section of the present invention;

fig. 4 is a partial enlarged view of fig. 2A according to the present invention;

fig. 5 is a partial enlarged view of fig. 2B according to the present invention;

fig. 6 is a cross-sectional view of the arc-shaped inner cylinder in embodiment 1 of the present invention;

description of reference numerals: 1-a safety joint; 11-a first wire sheath; 12-an adjustment section; 21-upper stabilizer; 22-lower stabilizer; 31-pressing the cap; 32-a brake ring; 33-adjusting the screw cap; 41-a first half ring; 42-a first bearing; 43-a first bearing cartridge; 44-a mandrel; 441-flow-through holes; 51-a second half-ring; 52-second bearing member; 53-second bearing cartridge; 54-a suspension assembly; 541-back pressure valve seat; 6-outer cylinder; 61-a second wire sheath; 7-inner cylinder; 8-an arc-shaped inner cylinder; 81-a fixing member; 82-notch; and 9, a core gripper assembly.

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.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

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

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

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

Referring to fig. 1-6, the present invention provides a preferred embodiment of a double-layer inner cylinder conformal coring tool.

Referring to fig. 1 to 5, a double-layer inner cylinder shape-preserving coring tool comprises a safety joint 1, an outer cylinder 6, a first rotating assembly, an inner cylinder 7, a core claw assembly 9 and a coring bit, wherein the safety joint 1 is respectively connected with the outer cylinder 6 and the first rotating assembly, the inner cylinder 7 is sleeved in the outer cylinder 6, the upper part of the inner cylinder 7 is connected with the first rotating assembly, a gap for circulating drilling fluid is reserved between the outer cylinder 6 and the inner cylinder 7, the bottom of the inner cylinder 7 is connected with the core claw assembly 9, and the bottom of the outer cylinder 6 is connected with the coring bit. The top of the safety joint 1 is provided with a first thread protecting sleeve 11 for protecting the top thread of the safety joint 1.

The first rotating assembly comprises a first half ring 41, a first bearing 42, a first bearing box 43 and a mandrel 44, the first half ring 41 and the first bearing 42 are sleeved on the outer side wall of the upper part of the mandrel 44, the first half ring 41 is abutted on the upper part of the first bearing 42, the first bearing box 43 is covered on the outer side of the first bearing 42, and the upper part of the first bearing box is connected with the safety joint 1; the mandrel 44 is provided with a flow hole 441, and the flow hole 441 is communicated with a gap between the outer cylinder 6 and the inner cylinder 7 and is used for circulating drilling fluid; the lower portion of the spindle 44 is connected to the inner cylinder 7. The bottom of the safety joint 1 is provided with an adjusting part 12, the first bearing box 43 is connected with the adjusting part 12, and the connecting position of the first bearing box can be adjusted in the adjusting part 12 so as to adjust the distance between the core gripper assembly 9 and the coring bit. The adjusting part 12 is sequentially sleeved with a pressing cap 31, a braking ring 32 and an adjusting nut 33 from top to bottom, the braking ring 32 is clamped between the pressing cap 31 and the adjusting nut 33, and the lower part of the adjusting nut 33 is connected with the first bearing box 43.

The double-layer inner cylinder conformal coring tool further comprises a second rotating assembly, the second rotating assembly comprises a second half ring 51, a second bearing 52, a second bearing box 53 and a suspension component 54, the second half ring 51 and the second bearing 52 are sleeved on the outer side wall of the upper portion of the suspension component 54, the second half ring 51 is abutted against the upper portion of the second bearing 52, the second bearing box 53 is wrapped on the outer side of the second bearing 52, and the upper portion of the second bearing box is connected with the mandrel 44.

The lower part of the suspension component 54 is detachably connected with two arc-shaped inner cylinders 8 through pins, and the arc-shaped inner cylinders 8 are positioned on the same circumference; a gap 82 is formed between the two arc-shaped inner cylinders 8 and is used for discharging core slag and rock debris. The top of the suspension component 54 is provided with a back pressure valve seat 541 for placing a sealing ball to seal the inner cavity of the inner cylinder 7.

An upper stabilizer 21 is arranged between the safety joint 1 and the outer cylinder 7; the lower part of the outer cylinder 7 is connected with a lower stabilizer 22, and the lower part of the lower stabilizer 22 is connected with the second thread protecting sleeve 61 for protecting the bottom thread of the lower stabilizer 22.

Referring to fig. 6, in this embodiment, it should be noted that, the vertical distance between the notches 8 is t, and the size of t is adjusted to adapt to core fragments and rock debris with different sizes; when a broken stratum is drilled, t needs to be increased, because the broken rock core and the rock debris are more at the moment, the rock core is easy to be blocked in the inner cylinder 7, and more broken rock core and rock debris can enter the inner cylinder 7 through the increased notch 8, so that excessive abrasion of the broken rock core and the rock debris on the rock core and damage of the integrity of the rock core are avoided; when a harder stratum is drilled, t can be reduced, the area of the inner wall of the arc-shaped inner cylinder 8 is larger, and the support stability of the core pillar is improved.

Referring to fig. 1 to 6, when the scheme is used, a drilling tool is assembled and goes down a well, a sealing ball is not thrown into the drilling tool, a return pressure valve seat 541 is a passage, a mandrel 44 is communicated with an inner cylinder 7, and a circulation hole 441 is communicated with gaps between the mandrel 44 and the inner cylinder 7 and between the mandrel 44 and an outer cylinder 6; pumping drilling fluid to the well and forming the circulation, forming the mud cake protection wall of a well in the pit, erodeing the shaft bottom, some drilling fluid enters into the arc inner tube 8 that hangs subassembly 54 and connect back through back pressure valve seat 541 in addition, because be equipped with breach 82 between two arc inner tubes 8, so drilling fluid can directly wash to the inner wall of inner tube 7 on, the chamber wall of inner tube 7 and arc inner tube 8 all receives to wash, avoids having impurity adhesion to remain, has wearing and tearing destruction to the rock core.

Before drilling begins, the sealing ball is thrown into the well, falls in the drilling tool and finally falls on the back pressure valve seat 541, blocks the suspension assembly 54 and blocks the communication between the mandrel 44 and the inner barrel 7. When the core is fed, the safety joint 1 drives the outer cylinder 6 to rotate, the outer cylinder 6 is linked with the core bit to feed and core, and the first bearing box 43 and the first bearing piece 42 are in rolling connection under the action of the first rotating assembly, so that the first bearing box 43 rotating along with the safety joint 1 cannot drive the mandrel 44 to rotate, and the inner cylinder 7 cannot rotate; it should be noted that, what is described above is that the first-stage rotation stopping mechanism in this scheme can provide a stable storage space for the rock core column in the inner tube 7, and plays the guard action to the rock core.

The second rotating assembly is used as a second-stage rotation stopping mechanism and only plays a role in installing and connecting the arc-shaped inner cylinder 8 when the first rotating assembly works normally. The inner diameter of the core jaw assembly 9 is adapted to the circumference formed by the two arc-shaped inner cylinders 8, so that the core column can smoothly enter the two arc-shaped inner cylinders 8. Referring to fig. 6, when the core pillar enters the arc core inner cylinder 8, the outer surface of the complete core can carry rock debris, the broken core generally returns to the shape of broken slag, and the rock debris and the broken slag enter the space between the arc inner cylinder 8 and the inner cylinder 7 through the notch 82, so that the problems of core grinding, mechanical collision and the like are avoided. Further improvement, the lithology of the bottom layer is obtained according to the existing geological data or pre-drilling, the proper type of the arc inner cylinder 8 can be selected, namely, the vertical distance t between the arc inner cylinders 8 is adjusted, t is increased to adapt to a broken stratum, and t is reduced to adapt to a hard and complete stratum.

It should be noted that, when the rotation stopping function of the first rotating assembly is weakened or even disabled, the mandrel 44 may drive the inner cylinder 7 to rotate, which may damage the core string, and at this time, the second rotating assembly may play a role in stopping rotation, specifically, the second bearing box 53 and the second bearing 52 are in rolling connection, although the mandrel 44 may drive the inner cylinder 7 to rotate but may not drive the hanging assembly 54, the arc-shaped inner cylinder 8 connected to the hanging assembly 54 may not rotate, which still provides a stable storage space for the core string.

When coring and reaching the default, pull out the brill, dismantle out inner tube 7 and arc inner tube 8 from the drilling tool, the detritus and the rock core disintegrating slag of collecting in the inner tube 7, what collect in the arc inner tube 8 is intact rock core, the utility model discloses have the function of classified collection to the rock core, improved work efficiency. In this embodiment, the process of detaching the arc-shaped inner cylinder 8 includes removing a pin of one of the arc-shaped inner cylinders 8 from the suspension assembly 54, and then removing the arc-shaped inner cylinder 8, so that a complete core column is exposed, and the core column can be smoothly and conveniently taken out. Of course, the fixing member 81 may be a detachable member for fixing other than the pin.

Claims (9)

1. A double-layer inner cylinder shape-preserving coring tool comprises a safety joint (1), an outer cylinder (6), a first rotating assembly, an inner cylinder (7), a core claw component (9) and a coring bit, wherein the safety joint (1) is respectively connected with the outer cylinder (6) and the first rotating assembly, the inner cylinder (7) is sleeved in the outer cylinder (6), the upper part of the inner cylinder (7) is connected with the first rotating assembly, a gap for circulation of drilling fluid is reserved between the outer cylinder (6) and the inner cylinder (7), the bottom of the inner cylinder (7) is connected with the core claw component (9), and the bottom of the outer cylinder (6) is connected with the coring bit; the method is characterized in that:

the first rotating assembly comprises a first half ring (41), a first bearing piece (42), a first bearing box (43) and a mandrel (44), the first half ring (41) and the first bearing piece (42) are sleeved on the outer side wall of the mandrel (44), the first half ring (41) is abutted to the upper portion of the first bearing piece (42), the first bearing box (43) is wrapped on the outer side of the first bearing piece (42), and the upper portion of the first bearing box is connected with the safety joint (1); the mandrel (44) is provided with a circulation hole (441), and the circulation hole (441) is communicated with a gap between the outer cylinder (6) and the inner cylinder (7) and is used for circulating drilling fluid; the lower part of the mandrel (44) is connected with the inner cylinder (7);

the double-layer inner cylinder conformal coring tool further comprises a second rotating assembly, the second rotating assembly comprises a second half ring (51), a second bearing piece (52), a second bearing box (53) and a suspension component (54), the second half ring (51) and the second bearing piece (52) are sleeved on the outer side wall of the suspension component (54), the second half ring (51) abuts against the upper portion of the second bearing piece (52), the second bearing box (53) is sleeved on the outer side of the second bearing piece (52), and the upper portion of the second bearing box is connected with the mandrel (44);

the lower part of the suspension component (54) is detachably connected with at least two arc inner cylinders (8) through fixing pieces (81), and the arc inner cylinders (8) are positioned on the same circumference; a gap (82) is formed between every two adjacent arc-shaped inner cylinders (8) and is used for discharging core crushed slag and rock debris.

2. The dual layer inner barrel conformal coring tool of claim 1, wherein: the top of the safety joint (1) is provided with a first thread protecting sleeve (11) for protecting the top thread of the safety joint (1).

3. The dual layer inner barrel conformal coring tool of claim 1, wherein: the bottom of the safety joint (1) is provided with an adjusting part (12), the first bearing box (43) is connected with the adjusting part (12), and the connecting position of the first bearing box can be adjusted in the adjusting part (12) so as to adjust the distance between the core gripper assembly (9) and the coring bit.

4. The dual layer inner barrel conformal coring tool of claim 3, wherein: the adjusting part (12) is sequentially sleeved with a pressing cap (31), a braking ring (32) and an adjusting nut (33) from top to bottom, the braking ring (32) is clamped between the pressing cap (31) and the adjusting nut (33), and the lower part of the adjusting nut (33) is connected with the first bearing box (43).

5. The dual layer inner barrel conformal coring tool of claim 1, wherein: and a back pressure valve seat (541) is arranged at the top of the suspension component (54) and used for placing a sealing ball to seal the inner cavity of the inner cylinder (7).

6. The dual layer inner barrel conformal coring tool of claim 1, wherein: and a second thread protecting sleeve (61) is arranged at the bottom of the outer cylinder (6) and used for protecting the bottom side threads of the outer cylinder (6).

7. The dual layer inner barrel conformal coring tool of claim 6, wherein: an upper stabilizer (21) is arranged between the safety joint (1) and the outer cylinder (6); the lower part of the outer cylinder (6) is connected with a lower stabilizer (22), and the lower part of the lower stabilizer (22) is connected with the second thread protecting sleeve (61).

8. The dual layer inner barrel conformal coring tool of claim 1, wherein: the fixing piece (81) is a pin.

9. The dual layer inner barrel conformal coring tool of any one of claims 1-8, wherein: the number of the arc-shaped inner cylinders (8) is two.

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