Coring device and coring method

A coring device and coring bit technology, which is applied in the direction of extracting undisturbed core devices, borehole/well valve devices, earthwork drilling and mining, etc., can solve problems such as ball valve stuck, and achieve the effect of accurate results and simple structure

Active Publication Date: 2021-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the rock core is easy to get stuck when the ball valve is closed, and to provide a coring device and a coring method. The ball valve is stuck to realize in-situ fidelity coring, so as to ensure the accuracy of the calculation results of oil and gas reserves

Method used

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  • Coring device and coring method
  • Coring device and coring method
  • Coring device and coring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] figure 1 It is a schematic diagram of the state of the coring device opening the ball valve, figure 2 It is a schematic diagram of the state of closing the ball valve of the coring device, image 3 yes figure 2 Enlarged view of one end of the core bit in the coring device, see Figure 1-Figure 3 As shown, the coring device includes an upper connection button 1 , a coring outer cylinder 6 and a coring drill 4 connected in sequence. The upper link 1 is used to connect a power device to provide drilling power. The upper connecting button has an axially arranged connecting button inner hole 101, the connecting button inner hole 101 of the upper connecting button 1, the inner hole of the coring outer cylinder 6 and the drill bit inner hole 402 of the coring drill bit 4 connected to form the first shaft hole. The core drill 4 is provided with a drill inner hole 402 , and the bottom surface of the drill inner hole 402 is provided with a core hole 404 , and one end of th...

Embodiment 2

[0035] The difference between the coring device in embodiment 1 and the coring device in embodiment 2 lies in the lifting mechanism. see Figure 1-Figure 3 As shown, the lifting mechanism includes a protruding ring 201 arranged on the outer wall of the differential lifting rod 2, an annular groove 102 is opened on the inner wall of the inner hole 101 of the buckle, and the outer diameter of the protruding ring 201 is consistent with the The diameters of the ring grooves 102 are equal. The protruding ring 201 is set in the annular groove 102, and the differential lifting rod 2 is provided with a second communication hole 207, and the second communication hole 207 is located on the protruding ring 201 close to the core bit 4 On one side, the second communication hole 207 communicates with the buckle inner hole 101, the side wall of the ring groove 102 is provided with a second drain hole 11, and the second drain hole 11 is located in the convex ring 201 away from the side of t...

Embodiment 3

[0039] see Figure 1-Figure 3 As shown, on the basis of Example 2, the inner wall of the coring outer cylinder 6 is provided with a vacuum insulation sleeve 8 to further heat-insulate the coring inner cylinder 7 . The upper adapter 1 is connected to the coring outer cylinder 6 through a connecting head 3 . The two ends of the connecting head 3 form a tapered structure, and the two ends of the coring outer cylinder 6 are provided with tapered holes to be threadedly connected with the connecting head 3 . The connecting groove 206 is opened on the connecting head 3 and the coring outer cylinder 6 , or the section of the connecting head 3 and the bottom surface of the taper hole of the coring outer cylinder 6 are spaced to form the connecting groove 206 . The coring outer cylinder 6 is threadedly connected to the core bit 4 . The chamfering of the mouth of the drill inner hole 402 forms a tapered hole structure 404, the two ends of the coring outer cylinder 6 are tapered, and th...

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Abstract

The invention discloses a coring device and a coring method. The coring device comprises an upper connecting buckle, a coring outer cylinder and a coring drill bit which are sequentially connected, a connecting buckle inner hole of the upper connecting buckle, an inner hole of the coring outer cylinder and a drill bit inner hole of the coring drill bit are communicated to form a first shaft hole, a detachable valve, a slidable differential lifting rod and a coring inner cylinder connected with the valve and the differential lifting rod are arranged in the first shaft hole, a coring hole of the coring drill bit is communicated with the coring inner cylinder through the valve, the differential lifting rod is further connected with a lifting mechanism, and the lifting mechanism can drive the differential lifting rod and the coring inner cylinder to be away from the valve by a certain distance and close the valve. The coring method comprises the step that a sealing ball is put in to enable the lifting mechanism to drive the differential lifting rod to ascend. According to the coring device and the coring method, the valve is closed after a rock core is far away from the valve for a certain distance, so that the problem that the valve is blocked by the rock core is avoided, and the reliability of heat-preservation and pressure-maintaining coring is improved.

Description

technical field [0001] The invention relates to the technical field of coring for oil and gas exploration, in particular to a coring device and a coring method. Background technique [0002] The core is the most intuitive and reliable precious data reflecting the underground depositional environment. When conducting rock mechanics test research, the rock or core is usually taken out first and processed into a standard specimen before testing. However, after the core is taken out from the in-situ environment, some components of the core are oxidized after contact with the outside air, the original pressure is released, and the oil, gas and water in the core are volatilized and lost due to changes in the original pressure and temperature state of the formation. , the physical properties of the rock will also be destroyed. In order to make the oil and gas characteristics of the core consistent with the real situation of the formation, and to ensure the accuracy of the calculat...

Claims

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Application Information

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IPC IPC(8): E21B25/00E21B25/10E21B34/06E21B10/60E21B21/00
CPCE21B25/00E21B25/10E21B34/06E21B10/605E21B21/00
Inventor 敬佳佳邱志礼邱晨昊唐曦何航宇
Owner SOUTHWEST PETROLEUM UNIV
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