Use of pre-stressed steel strand in the procedure of multi-angle drilling coring

Abstract

The present application discloses the use of the pre-stressed steel strand in, the procedure of multi-angle core drilling. Using the properties of high strength and toughness of pre-stressed steel strand material, the core internal pipe is pushed inside the drill rod without deformation and damage. The rolling wheel is designed to rapidly take out and put back the pre-stressed steel strand to finish the extracting of the core, without taking out and putting back the drill rod. Without altering the original structure of the drilling machine, the technology of 360 core drilling is realized. Problems of tedious and arduous operations and a low efficiency in multi-angle drilling are resolved completely. The use of the pre-stressed steel strand not only can significantly improve the drilling-in efficiency, but also is beneficial to guarantee the quality of the rock mineral coring, reduce the cost of drilling, lower the labor intensity notably.

Claims

1. A method for multi-angle core drilling using pre-stressed steel strand, comprising: A setting up a drilling machine with support on a drilling field; conducting a safety check; running the drilling machine; installing a first core internal pipe; drilling a hole; B conveying a pre-stressed steel strand by a rolling wheel after the first core internal pipe is full with a core by drilling; wherein the pre-stressed steel strand enters a front part of a drill rod to obtain the core internal pipe; pulling out the first core internal pipe without taking out the drill rod; putting down the first core internal pipe; C putting a second core internal pipe in the drill rod; pushing the second core internal pipe by the pre-stressed steel strand which is driven by the rolling wheel, such that the second core internal pipe is pushed into a front end of the drill rod; pulling out the pre-stressed steel strand; winding the pre-stressed steel strand on a winder; linking the drill rod; running a power head; keeping drilling; wherein the second core internal pipe is empty before drilling; D when the drilling machine is drilling with the second core internal pipe, retrieving a core of the first core internal pipe; and when the drilling machine is drilling with the first core internal pipe, retrieving a core of the second core internal pipe; E repeating the steps B, C, and D, till a predetermined drilling depth is reached.

Description

BR DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is the structural schematic diagram where the present application is applied in the drilling equipment;

(2) FIG. 2 is the structural schematic diagram where the present application is applied in the drilling equipment (the drilling machine added).

(3) FIG. 3 is the flow chart of the present invention.

DETAILED DESCRIPTION

(4) Hereinafter, the usage of the present application is further described in detail.

(5) In FIGS. 1-2:

(6) 1. drill rod; 2. core internal pipe; 3. pre-stressed steel strand; 4. rolling wheel; 5. winder; 6. power head; 7. drill bit; 8. drill machine.

Embodiments

(7) Operation and Equipment Conditions

(8) Regarding the downhole horizontal drilling task, the working space has a height of 2 meters and a width of 2 meters. The power head type tunnel drilling machine 8 is used. The oil cylinder stroke is 0.75 meters. The hole depth is 300 meters. The double-pipe coring process meets the standard of the Ministry of Metallurgical Industry. The drill rod is 1.5 meters. The core internal pipe is 1.5 meters.

(9) The Operating Method of the Double-Pipe Coring Process in the Prior Art:

(10) 1. On the above drilling field, the drilling machine 8 is set up with supports. After the safety checking is finished, the drilling machine 8 starts to run. The core internal pipe is installed to open a hole and drill into the hole.

(11) 2. After the core internal pipe is full by drilling, (In the first round trip of drilling, the drilling machine 8 clamps the core internal pipe) the effective trip of the drilling machine 8 is used to go forward and backward twice to pull out the core internal pipe. The drill bit 7 and the reamer are demounted. The core is retrieved. Next, the drill bit 7 and the reamer are mounted again. The core internal pipe is pushed forward and backward twice with the drilling machine 8 oil cylinder, so as to be fed into the hole. The drill rod is linked to go on drilling.

(12) 3. In the second round trip, the core internal pipe is fully filled. The drilling machine 8 oil cylinder is used to go forward and backward four times to pull out the drill rod and the core internal pipe. The drill bit 7 and the reamer are demounted. The core is retrieved. Next, the drill bit 7 and the reamer are mounted again. The core internal pipe is pushed forward and backward four times to be fed into the hole. The second drill rod is linked to go on drilling.

(13) 4. In the third round trip, the core internal pipe is fully filled. The drilling machine 8 oil cylinder is used to go forward and backward six times to pull out the drill rod and the core internal pipe. The drill bit 7 and the reamer are demounted. The core is retrieved. Next, the drill bit 7 and the reamer are mounted again. The core internal pipe is pushed forward and backward six times to be fed into the hole. The third drill rod is linked to go on drilling.

(14) 5. The drilling steps are performed as above; and so on. Every time the core is retrieved, all the drill rods need to be taken out. If 200 drill rods are to be taken out, 800 times of operation of taking-out, 400 times of mounting and demounting of the drill rods are required. Each round trip can be finished within about 110 minutes.

(15) Operation Method of Pre-Stressed Steel Strand Coring Process of the Present Application:

(16) 1. Under equal conditions, the pre-stressed steel strand coring process is used. On the field, the drilling machine 8 is set up with supports. After the safety checking is finished, the drilling machine 8 starts to run. Core internal pipe 2 is installed to open a hole and drill into the hole. (Two core internal pipes are prepared on site.)

(17) 2. After the core internal pipe 2 is full by drilling, the pre-stressed steel strand coring overshot is conveyed by rolling wheel 4, and enters the drill rod to obtain core internal pipe 2. Core internal pipe 2 is rapidly pulled out and put down. Next, an empty core internal pipe is taken. The core internal pipe is pushed rapidly by the pre-stressed steel strand pusher driven by the rolling wheel. The core internal pipe is clamped. Pre-stressed steel strand 3 is pulled out. Drill rod 1 is linked to go on drilling.

(18) 3. When the drilling machine 8 is drilling, the core is retrieved, which increases the drilling-in time.

(19) 4. In the second round trip, when the core internal pipe is full, the drill rod does not need to be taken out. The pre-stressed steel strand coring overshot is conveyed by rolling wheel 4, and enters the drill rod to obtain the core internal pipe. The core internal pipe is rapidly pulled out and put down. Next, an empty core internal pipe is taken. The core internal pipe is pushed rapidly by the pre-stressed steel strand pusher driven by the rolling wheel. The core internal pipe is clamped. The pre-stressed steel strand is pulled out. The drill rod is linked to go on drilling.

(20) 5. When the drilling machine 8 is drilling, the core is retrieved.

(21) 6. In the third round trip, when the core internal pipe is full, the drill rod does not need to be taken out. The pre-stressed steel strand coring overshot is conveyed by the rolling wheel, and enters the drill rod to obtain the core internal pipe. The core internal pipe is rapidly pulled out and put down. Next, an empty core internal pipe is taken. The core internal pipe is pushed rapidly by the pre-stressed steel strand pusher driven by the rolling wheel. The core internal pipe is clamped. Pre-stressed steel strand is pulled out. The drill rod is linked to go on drilling.

(22) 7. When the drilling machine 8 is drilling, the core is retrieved.

(23) 8. The above steps are repeated, such that the core can be extracted without taking out the drill rods, as shown in FIG. 3.

(24) With the pre-stressed steel strand coring process, under equal conditions, it is not necessary to take out 200 drill rods. The pre-stressed steel strand can take out and put back the core internal pipe within about 20 minutes to finish one round trip. The efficiency of the pre-stressed steel strand coring process is 5.5 times as that of the double-pipe coring process.

(25) If a drilling task of 300 meters tunnel horizontal hole is to be completed, under equal conditions, the double-pipe coring method in the prior art requires the operator to conduct 80400 times of pulling and pushing operation, and 40200 times of mounting and demounting of the drill rods, loosening and fastening the drill rods and the drill thread actions, so as to retrieve the core. If the pre-stressed steel strand coring of the present application is used, under equal conditions, the drill rods do not need to be taken out. Merely 400 times of pulling and pushing of the core internal pipe are needed to retrieve the core (during which all the drill rods need to be taken out if the drill bit is replaced, and 1200 times of operations are counted for replacing three drill bits). Only 1600 times of pulling and pushing actions in total are needed to complete the task. The labor intensity of the operator is lowered, and 50 times of labor work can be saved.

(26) In 2015, the present application is applied in the multi-angle drilling on site for a long time. For a dozen hours of experiment every day, it is proved that the pre-stressed steel strand coring does not cause any abnormal condition, sticking of the drill, drilling without reaching the bottom of the hole, and broken pre-stressed steel strand situation. The pre-stressed steel strand coring shows good stability, and can meet the requirements on site to reach the ideal status of the pre-stressed steel strand coring. Without altering the original structure of the drilling machine, a small amount of investment is required to realize the multi-angle drilling.