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Underground debris sampler

A technology of sampler and cuttings, applied in the direction of wellbore/well components, earthwork drilling and mining, etc., which can solve the problems of large delay time error and other problems

Inactive Publication Date: 2013-12-11
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a downhole cuttings sampler, which can completely solve the problem of large delay time error existing in the existing mud logging technology, thereby greatly improving the cuttings logging accuracy and realizing the cuttings homing accuracy High, cuttings are not mixed, and can realize automatic, fixed-point cuttings sampling while drilling; Compared with coring, it reduces the tripping and drilling without affecting production drilling, reduces labor and improves pure drilling time

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0028] Before drilling, press the sampling bag ( Figure 7 ) from the bottom of the wellbore into the outer cylinder 2 in sequence, and record the sampling bag ( Figure 7 ) in the order of number 37. During the drilling process, in order to accurately control the inner cylinder ( figure 2 ) activities and meet the needs of cuttings sampling, connect the top of the outer cylinder 2 and the inner cylinder ( figure 2 ) The elastic recovery of the spring 13 at the top can just make the inner cylinder ( figure 2 ) lower extraction claw ( Figure 5 ) down to the sampling bag ( Figure 7 ) stacked place, and put the bag used for control sampling ( Figure 7 ) active control cap ( Figure 8 )'s triangular nose-shaped cap 6 is opened, so that the stacked sampling bags ( Figure 7 ) with exactly one sampling bag ( Figure 7 ) into the extraction claw ( Figure 5 ) in. In stacked sampling bags ( Figure 7 ) has a spring plate 4 controlled by a spring 3, so that the inner c...

Embodiment approach 2

[0033] exist Figure 9The V terminal of the circuit is connected to the drilling and measuring electrical signal, K2 is disconnected, and K1 is closed. When drilling to an abnormal signal band, a servo voltage V is generated to drive the entire circuit to realize automatic cuttings sampling. Record sampling bag ( Figure 7 ) stacking order and sampling times and the depth of the sampler when the servo voltage is generated (the depth of the sampler=the depth of the bottom of the well−the length between the drill bit and the sampler). The sampling process is consistent with Embodiment 1.

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Abstract

The invention provides an underground debris sampler, which is a section of special mineshaft. An inner cylinder (shown in a map 2) is arranged in an outer cylinder (2); a sampling bag (36) is drew by the inner cylinder (shown in the map 2) and a small wedge (34) and a small rectangular solid (35) of a drawing claw (shown in a map 5) which is positioned at the lower end of the inner cylinder (shown in the map 2) and is connected with the inner cylinder (shown in the map 2) into a whole; when the sampling bag (36) is carried by the inner cylinder (shown in the map 2) to a certain height, namely a mud injection port (7), a switch (S1 shown in a map 4) of a time trigger 555IC is triggered to ensure that debris is collected in the debris sampling bag (36); after the time trigger 555IC is reset, the inner cylinder (shown in a map 2) rises continuously, and two back-to-back small wedges (40 and 41) on an unloading claw (shown in a map 6) on the inner wall of the outer cylinder make a small metal ring (5) of the sampling bag deformed and contracted, so that the debris entering the sampling bag (36) and the debris in the mud are separated; therefore, underground automatic sampling is realized.

Description

Technical field [0001] The invention relates to a cuttings sampling device for downhole, in particular to a cuttings sampling device which is fixed-point, automatic and free from the influence of late time in the process of oil and gas drilling. Background technique [0002] At present, the well-known cuttings logging tools collect cuttings on the ground, and then judge the buried depth before the cuttings are broken by calculating the late arrival time. The accuracy of the late arrival time of cuttings directly affects the homing of the cuttings profile. Error with measured depth. Patent Nos. 92200646.6, 200820302570.6 and other patents have reported the status quo of ground cuttings logging. However, no patented technology related to sampling cuttings in the mine can be found on the patent search website of the State Intellectual Property Office and related websites. The fatal defect of the mud logging method of obtaining cuttings on the ground and analyzing the cuttings...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/02
Inventor 张雷张学娟刘敏卢双舫王民薛海涛
Owner NORTHEAST GASOLINEEUM UNIV