Shenyang ABT Drilling Equipment Co., Ltd.

How to Select Equipment and Drilling Tools for Medium and Small-sized Drilling Machine when Laying Pipelines in Hard Rock Formations?

Nowadays, it has become a reality to use small and medium-sized horizontal directional drilling rigs to lay pipelines in hard rock formations. The following will discuss the equipment requirements and selection of using small and medium-sized horizontal directional drilling rigs to lay pipelines in hard rock formations.


Drill bit: Although the drill bit is small, it is extremely critical. All other drilling equipment is based on matching with the drill bit. Three common types of drill bits:


(1) Inclined palm face bit: cheap, suitable for pilot hole drilling in soft formations;


(2) Cone bits: moderately priced, in a variety of forms and suitable for a variety of formations, with good milling resistance and high strength, making them the most efficient bit choice for drilling in hard rock formations.


(3) Diamond drill bits: expensive, using homogeneous hard rock formations and some igneous rocks. The use of diamond drill bits in conglomerate and pebble formations will greatly shorten the lifespan. It is recommended not to use them in such formations;


Screw motor: The screw motor is driven by the mud to drive the drill bit to cut the rock and realize directional drilling. Efficient drilling can be achieved by selecting an effective combination of bit size, pump volume, and bit unit area load.


Drill rod: Drill pipe is the key medium for transmitting torque, thrust, backing force and mud. The proper diameter of the drill rod can ensure the transmission of sufficient torque and thrust to ensure the drilling of the rock formation. The inner diameter of the drill pipe needs to meet the mud volume requirements of the drive screw motor and the drill bit.


Drilling rig: drilling into the formation to determine the bottom hole assembly, so as to determine the size of the required rig.


Reamer: The pressure per unit area acting on the drilled section is not less than: 6.895Mpa, and the speed should be 40-90 rpm. The final hole diameter of the small drill is 250-305mm. Medium-sized: 445-660mm. Of course, as the length of the traverse increases, the requirements for expanding the drill rig with the same diameter are higher.


In hard rock formations, it is more economical to use small rock drilling equipment to complete pilot hole drilling and to use medium-sized drills for reaming.

Related News
  • Notes for Air Leg Rock Drill

    Notes for Air Leg Rock Drill

    May 8, 2020Air leg rock drill is a kind of high efficiency rock drill. It is widely used in rock tunnel excavation and various rock drilling operations to drill and blast holes. It is an important machine in roc...view
  • Well Drilling and Drilling Technology

    Well Drilling and Drilling Technology

    November 21, 2019Drilling is to use drilling equipment such as downhole drilling rigs to drill a test hole in the formation.view
  • What is a Jumbo Drill Rig?

    What is a Jumbo Drill Rig?

    May 8, 2020From a large, outdoor rig for wells of water, oil and natural gas to a portable auger, a jumbo drill rig is a mechanical device used for hole drilling in the earth's surface.view
  • Advantage Analysis of Water Detector to the PQWT TC150

    Advantage Analysis of Water Detector to the PQWT TC150

    October 12, 2019Searching for groundwater requires the aid of a professional underground water seeker to study topography by analyzing profiles.view
  • What are the Characteristics of a Good Construction Drilling Machine?

    What are the Characteristics of a Good Construction Drilling Machine?

    November 16, 2020The characteristics of a good construction drilling machine:1. Convenient installation: The installation is convenient, suitable for soil layers, quicksand layers, and a small amount of rock and soil ...view
  • Why Anbit

    Why Anbit

    May 8, 2020Anbit mechanical and Electrical Equipment Co., Ltd. is a high-tech drilling equipment company specializing in the sales of various drilling rigs and drilling engineering machinery. Moreover, it is als...view
CONTACT
Tel:+86-13889196063
Add:No. 95-2, blacksmith Road, Hunnan District, Shenyang, Liaoning