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In the sand soil, the core method of drilling the core of the rocky core is used in the sand soil

A sandy soil and core technology, applied in the field of sandy soil core sample collection, can solve the problem that it is difficult to accurately determine the particle composition of sandy soil core samples, which affects the accuracy of sandy soil layering and geological identification, and the drilling and extraction of sandy soil layers. Low core rate and other issues, to achieve the effect of being conducive to widespread application, easy to learn and master, and low equipment performance requirements

Active Publication Date: 2020-01-17
长江岩土工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low rate of drilling cores in sandy soil layers has always been one of the main problems affecting the quality of engineering drilling. For some projects that need to study the microstructure of sand layers, the existing techniques and methods are difficult to meet the engineering requirements
[0003] The existing sand core sample collection technology level is low, and the sand layer core sample collection rate has always been low, mostly below 50%, which affects the sand layer and geological identification accuracy
[0004] Sandy soil core samples are often mixed with mud, it is difficult to accurately determine the particle composition of sandy soil core samples, and repeatedly disturbed in the drilling tool, the sandy soil core samples taken out cannot reflect the original structure of sandy soil

Method used

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  • In the sand soil, the core method of drilling the core of the rocky core is used in the sand soil
  • In the sand soil, the core method of drilling the core of the rocky core is used in the sand soil
  • In the sand soil, the core method of drilling the core of the rocky core is used in the sand soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In the deep sand layer of a certain river, adopt the drilling and coring method of adopting the mud coat to wrap the core in the sand according to the present invention to drill and take the core, comprising the following steps:

[0062] Step 1: Drilling equipment is in place and assembled;

[0063] Step 2: Prepare natural composite mud according to the distribution of strata;

[0064] Natural composite mud is composed of water, bentonite, PW dry powder, and NaOH; bentonite: PW dry powder: NaOH is equal to 100:25:1.0:0.75; the mud specific gravity of natural composite mud is 1.03g / cm 3 ;The mud viscosity of natural composite mud is 18s;

[0065] Step 3: Drilling and coring: The diameter of the alloy drill bit of the drilling equipment is 110mm, and 9 alloy bits are inlaid with welded alloy;

[0066] (1) Drilling, according to the type of stratum, the drilling equipment drills according to the corresponding drilling parameters to a footage of 1.50m; each time the foota...

Embodiment 2

[0079] In the deep sand layer of a certain river, adopt the drilling and coring method of adopting the mud coat to wrap the core in the sand according to the present invention to drill and take the core, comprising the following steps:

[0080] Step 1: Drilling equipment is in place and assembled;

[0081] Step 2: Prepare natural composite mud according to the distribution of strata;

[0082] Natural composite mud is composed of water, bentonite, PW dry powder, and NaOH; water: bentonite: PW dry powder: NaOH is equal to 100:35:1.0:0.6; the mud specific gravity of natural composite mud is 1.15g / cm 3 ;The mud viscosity of natural composite mud is 21s;

[0083] Step 3: Drilling and coring: The diameter of the alloy drill bit of the drilling equipment is 110mm, and 9 alloy bits are inlaid with welded alloy;

[0084] (1) Drilling, according to the type of stratum, the drilling equipment drills according to the corresponding drilling parameters to a footage of 1.50m; each time the...

Embodiment 3

[0097] In the deep sand layer of a certain river, adopt the drilling and coring method of adopting the mud coat to wrap the core in the sand according to the present invention to drill and take the core, comprising the following steps:

[0098] Step 1: Drilling equipment is in place and assembled;

[0099] Step 2: Prepare natural composite mud according to the distribution of strata;

[0100] Natural composite mud is composed of water, bentonite, PW dry powder, and NaOH; bentonite: PW dry powder: NaOH is equal to 100:30:1.0:0.75; the mud specific gravity of natural composite mud is 1.10g / cm 3 ;The mud viscosity of natural composite mud is 19s;

[0101] Step 3: Drilling and coring: The diameter of the alloy drill bit of the drilling equipment is 110mm, and 9 alloy bits are inlaid with welded alloy;

[0102] (1) Drilling, according to the type of stratum, the drilling equipment drills according to the corresponding drilling parameters to a footage of 1.50m; each time the foota...

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Abstract

The invention discloses a drilling coring method enwrapping a rock core by using a mud coating in sandy soil. The drilling coring method comprises the following steps of putting a drilling apparatus in position and assembling; preparing natural compound mud according to the distribution condition of a stratum; drilling coring: according to the category of the stratum, drilling, by the drilling apparatus, until a drilling depth of 1.50m according to a corresponding drilling parameter; stopping a pump, stopping circulating the natural compound mud in a hole of a drill pipe and a drilled hole, opening a mud return valve, and putting a water-stop marble into the drill pipe; burning a bit, carrying out dry drilling after stopping the pump, drilling by adopting a low rotational speed and low drilling pressure in the beginning, when a rock core barrel is filled with the rock core, drilling by adopting high drilling pressure and a high rotational speed, generating a higher temperature betweenthe bottom of an alloy bit and a rock core sample of the sandy soil within a short time, and slightly sintering the bottom of the alloy bit and the rock core together; lifting the bit; withdrawing thecore by the pressure of the mud. The drilling coring method has the advantages that the recovery rate of the rock core sample of the sandy soil is improved by a wide margin, and can reach 100 percent; the rock core sample of the sandy soil is enwrapped by the mud coating, and the rock core sample of the sandy soil is enabled to maintain the undisturbed grain composition and structure of the sandysoil.

Description

technical field [0001] The invention relates to the technical field of taking sandy soil core samples, specifically it is a drilling and core-taking method in which mud coats are used to wrap rock cores in sandy soil; more specifically, it is a combination of a new type of mud material and a proportioning scheme The determined drilling method can greatly increase the collection rate of sandy soil core samples, up to 100%. The sandy soil core samples are wrapped in mud coat, so that the sandy soil core samples can maintain the original particle gradation and structure of sandy soil. Background technique [0002] Sandy soil is a common loose soil in Quaternary strata, which is granular, has no cohesive force, is easily broken under the condition of no confining pressure, and is easy to form quicksand flowing with water under the action of hydraulic force. The low rate of drilling cores in sandy soil layers has always been one of the main problems affecting the quality of engin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/00E21B25/08C04B26/02
CPCC04B26/026E21B25/00E21B25/08C04B14/104C04B22/062
Inventor 马贵生张延仓张涛胡梅生刘海峰候钦礼
Owner 长江岩土工程有限公司
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