Tag Archives: Hdd Equipment

The horizontal directional drilling technique (HDD) is on the way up at the moment. Directional drilling operations unheard of in the past, now belong to the everyday scene on a job site. Application of HDD units make longitudinal installations up to 500 m possible. Crossings beneath rivers and other waters are frequently performed.

The directional method even makes drillings beneath industry complexes possible. The range of application includes all pipe construction measures within the bounds of gas, district heating and drinking water supply, the installation of pressure lines for sewers as well as cable protection pipes for television or telephone cables, traffic routing systems, emergency call boxes or low, medium, high voltage and optical fibre cables.

HDD Equipment

Directional drilling and horizontal wells are often more efficient than other access methods and can replace a vertical well network by maximizing the zone of influence for remediation technologies. Horizontal wells also can be located beneath surface obstacles and can reduce disruption at a site.

HDD technology was introduced into China only few years ago. Now China is the world fastest growing HDD market. The pioneers in the China market were leading foreign produced equipment manufacturers like Vermeer among others. There are now several manufacturers producing HDD machines in China. Vermeer will soon begin assembly of their machines in China as they adapt to become competitive in the local market. The introduction of advanced HDD technology has created the demand for advanced
drilling fluids in China.

The dilemma facing HDD contractors was to either pay a high price for imported drilling fluids or face the prospect of lost productivity and equipment damage from using locally produced products. This problem has now been successfully tackled by the production of advanced HDD drilling fluids in China. CETCO is a world leader in manufacturing advanced HDD drilling fluids. Several years ago CETCO started a R&D program to create advanced drilling fluids using selected deposits of Chinese calcium bentonite as the chief raw material. After considerable work in processing technology and chemistry modification, high performance drilling fluids were finally
produced in their Chicago R&D Laboratories.

Horizontal directional drilling is short for HDD. The development of domestic horizontal drilling machine is in middle or small scale development level. No matter the requirements of foreign marketing or state environmental protection policy, the market prospect of HDD is very good.

Foreign horizontal directional drill rig is developing toward to large-scale, microminiaturization, mechanical automation, hard stratum working, exceed length and depth oriented monitoring drilling.

In exceed length horizontal directional, when pilot hole drill to a certain distance, the drilling stem is too long and form “s” bending lead to the drill rig is difficult to deliver pushing ahead and appear the track of drill bit is difficult to control. The construction technology of traditional horizontal directional drilling and equipment machines tools can’t meet the requirement of drilling, so solving exceed distance horizontal directional drilling is the emphasis development trend of HDD equipment and tools.

In exceed distance through process, using the counter through technology process is advanced. Using two sets drilling rig drill the pilot hole from distinguish designing import and export soil point, jointing in middle reasonable location can solve the traditional technology’s risk and malpractice. When traditional technology produce exceed distance through, the pilot hole is difficult to control, sometimes it needs repeatedly adjust and the mud pressure is high occur the accident of risk mud.

In counter trough technology, the most difficult and important is the butt joint of pilot hole. The advantages of butt joint of pilot hole for through.

The distance of through is long; especially the through distance is within 2000m and difficult single direction through process; the precision of through is high; there don’t have error of importer and exporter soil point.

The principle of counter through is the main drill rig drilling bit find the auxiliary process drill rig drilling bit, in the drilled holes follow auxiliary construct drilling bit, it avoids the long distance stress bending and easily breakage of single through drilling stem to improve the construction safety factor.

Compared with developed country, domestic popularization and application of trenchless technology can’t reach the proper level.