Development and Application Demonstration of 5000m Intelligent Geological Drilling Technology and Equipment

Release time:

2024-10-18

Institute of Exploration Technology, Chinese Academy of Geological Sciences, 2021

Geological Design

1. Well number: JZ04, well type: geothermal geological exploration well, well type: vertical well

2. In the JZ04 geothermal geological exploration well with a drilling depth of 4007.01m, according to the requirements of small-diameter rope coring full-hole drilling, φ146 with a drilling depth of 4007.01m is drilled into the JZ04 geothermal geological exploration well.

casing, a new small-diameter drilling structure is realized


 

Overview of final hole

1. The inner casing of φ146 casing is running for 4007.01m, and all φ146 casings are taken out after well completion.

2. In September 2021, P-specification rope coring tools will be adopted to intelligently control the drilling, with the final hole depth reaching 4017.50m and the core taking rate reaching 97.08%
 

Equipment

Large depth geological drilling technology and equipment

Formation information

Main strata include Cenozoic(Quaternary, Neogene, Paleogene), Proteozoic (Jixian)

Construction characteristics

1. Outer casing: 1. 2. three-stage casing adopts hanging casing structure, and the inner hole is stepped

2. Inner casing: φ146 casing is ultra-deep hole casing, which is installed in the outer casing from wellhead to bottom hole. From the wellhead to 1000m deep and then to 3000m

The depth in turn is the weighted centralizer coupling connection,The 3000m-4007m section is a straight-connected casing, each stage of casing is centralizing and fixed, and the casing lowering process is continuous and smooth.

3, the first ultra-deep geological core drilling application of stepped long casing string, the lowering process hanging time is long.




 

  Drilling process scheme

Process technology point

Primary casing

φ339.7 casing depth about 1400m

1, 5000m intelligent geological drilling technology and equipment research and development and application, focusing on the development of 5000m intelligent AC variable.

Frequency electric drive geological core drilling rig, geological drilling technology intelligent drilling control system, high-performance thin-walled rope extraction.

Core drill pipe, small diameter high-efficiency series of drilling tools, deep hole drilling key technology and equipment, built with diamond.

Cord coring process as the main bodyGeological deep hole drilling technology system within 5000m

2. In the JZ04 geothermal geological exploration well with a drilling depth of 1007.01m, the drilling requirements shall be filled with small diameter ropes.

Please, enter4007.01m 0146 casing, to achieve a new small diameter drilling structure. Using P specifications

The rope element core drilling tool intelligently controls the drilling, and the final hole depth reaches4017.50m, the core taking rate reaches

97.08, to achieve the drilling equipment supporting integration, functional control, drilling capacity of the actual drilling verification, create.

 30146 casing sets two Asian records














 

Secondary casing

φ244.5 Casing depth about 3000m

Level 3 casing

φ177.8 Casing depth about 4000m

inner sleeve

φ146 ultra-deep drilling casing, stepped coupling,

Hybrid casing string, casing depth approx.4007.0m
 

rope drilling

P-caliber rope coring full hole drilling to the end hole

Depth4017.50m
 

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