Nonmagnetic precision guarantee for directional drilling of Baoji Dingding titanium | titanium alloy nonmagnetic drill collar

In directional drilling and logging while drilling (mwd/lwd) operations in oil and gas fields, the non-magnetic drill collar is the key carrier of "trajectory navigation" - it needs to realize the three core functions of "data transmission without magnetic interference, torsional and compressive resistance, safety protection, corrosion resistance and wear resistance under suitable conditions". The traditional non-magnetic steel drill collars have some pain points such as high permeability, easy corrosion and heavy weight. The TC4 and TC18 titanium alloy non-magnetic drill collars developed by Baoji Dingding titanium, relying on the material advantages and precision processing technology of "China Titanium Valley", strictly follow API 7-1 and ISO 13680 standards, and achieve permeability ≤ 1.005 μ Ω and torsional strength ≥ 800MPa through the "integral forging+friction welding" process, which is perfectly suitable for complex drilling scenarios such as shale gas horizontal wells, high sulfur gas fields and ultra deep wells.

1、 Core performance advantage: value of titanium alloy remolded non-magnetic drill collar

According to the core requirements of directional drilling for non-magnetic drill collars with "low magnetic interference, high strength and good corrosion resistance", TC4 and TC18 form a differentiated performance system, achieving a qualitative breakthrough compared with non-magnetic steel and stainless steel drill collars:

TC4 (balanced non-magnetic type)

Ti-6Al-4V composition, permeability ≤ 1.003 μ ₀, completely eliminating the magnetic field interference to MWD instrument; Tensile strength ≥ 960mpa, torsional strength ≥ 800MPa, suitable for 2000-4000m conventional directional wells, 45% less weight than non magnetic steel drill collars.

TC18 (sulfur resistant non-magnetic type)

The composition of ti-4.4al-4mo-2sn was optimized, the permeability was ≤ 1.005 μ ₀, and the sulfur resistance grade reached SSC C110; There is no stress corrosion under the environment of 0.3MPa partial pressure of H ɑ s, which is the exclusive choice for directional drilling in high sulfur gas fields, and its service life is 3 times longer than that of non-magnetic steel.

Torsion resistance and wear resistance upgrade

The overall forging process is adopted for the pipe body, and the wall thickness uniformity is ≤± 0.5mm; the joint surface is nitrided (hardness hrc38), the wear resistance is increased by 3 times, and the wear rate of the joint is reduced from 0.2mm/thousand hours to 0.05mm/thousand hours.

All condition adaptation

The temperature resistance range is -50 ℃~480 ℃, which can resist the formation brine and CO ɑ corrosion; The length of a single drill collar is 3-12m, and the thread specification (API nc50/nc56) can be customized, which is suitable for all kinds of drilling equipment.

2、 Precise specification system: matching drilling conditions and equipment requirements

Combined with drilling depth, pressure level and logging instrument type, provide standardized and customized non-magnetic drill collars, covering the whole scene requirements from conventional wells to special wells:

3、 Core application scenario: precise non-magnetic support for directional drilling

1. shale gas horizontal well: non magnetic precision improves reservoir hit accuracy

Shale gas horizontal wells require extremely high borehole trajectory accuracy. Titanium alloy non-magnetic drill collar can eliminate magnetic interference:

-TC4 titanium alloy non-magnetic drill collar is used in Sichuan shale gas horizontal wells, with φ 139.7mm magnetic permeability ≤ 1.003 μ ₀. With LWD logging tool, the hole trajectory positioning error is reduced from 5cm to 0.8cm, the hit accuracy in the sweet spot area of the reservoir is increased by 90%, and the gas production of a single well is increased by 15%;

-The short joint TC4 drill collar (3m long) is suitable for the horizontal section steering operation. Its weight is light and easy to adjust the angle of the drilling tool. The steering efficiency is increased by 20%, and the construction period of the horizontal section is shortened from 15 days to 12 days.

2. high sulfur gas field: sulfur resistant and non-magnetic to ensure drilling safety

High sulfur gas fields are prone to stress corrosion of drill collars, and TC18 titanium alloy non-magnetic drill collars achieve dual protection:

-TC18 non-magnetic drill collar is used in Chongqing high sulfur gas field. It has no corrosion after 300 hours of continuous drilling in the environment of H ɑ s partial pressure of 0.3MPa, which is 3 times longer than that of non-magnetic steel drill collar (prone to stress cracks), so as to avoid blowout risk caused by drill collar failure;

-TC18 drill collar joint is nitrided, with hardness of hrc38. Its wear resistance in sulfur-containing drilling fluid is increased by 3 times, and the joint replacement cycle is extended from 100 hours to 300 hours, reducing drilling costs.

3. ultra deep well drilling: tough and non-magnetic to withstand extreme conditions

The high pressure and high temperature environment in ultra deep wells has strict requirements on the strength of the drill collar. The titanium alloy non-magnetic drill collar can work stably:

-The enhanced TC4 non-magnetic drill collar is used in Xinjiang 5000m ultra-deep wells. The tensile strength of φ 193.7mm specification is ≥ 1000MPa. It can withstand 150MPa high pressure without deformation. The permeability is still stable at 1.003 μ Ω at 450 ℃ well temperature, and the success rate of MWD data transmission has increased from 85% to 99.8%;

-Compared with the traditional non-magnetic steel drill collar, the weight of a single drill collar is reduced from 2.5 tons to 1.4 tons, the lifting load of drilling equipment is reduced, and the equipment failure rate is reduced from 12% to 1.5%.

4. deep sea drilling: corrosion resistant, nonmagnetic and suitable for marine environment

The drill collar of deep-sea drilling platform needs to resist seawater corrosion, and the titanium alloy non-magnetic drill collar achieves long-term protection:

-TC18 non-magnetic drill collar is used for the 1500m deep drilling platform in the South China Sea. It has a φ 178mm specification and is free of corrosion after 5000 hours of seawater immersion. It is resistant to marine organisms. Compared with the stainless steel drill collar, the maintenance cycle is extended from 1 month to 6 months;

-The non-magnetic characteristics ensure that the MWD instrument can still accurately transmit data in the complex marine magnetic field, and the borehole trajectory control error is ≤ 1cm, meeting the precision drilling requirements of deep-sea oil and gas development.

4、 Whole process quality assurance: meet the stringent standards for oil drilling

1. traceability control of raw materials: adopt ≥ 99.8% high-purity sponge titanium, strictly control the content of Al (4.4%-5.7%) and Mo (4%-5.5%) elements by TC18, and attach ICP-MS composition report and mine traceability to each batch of raw materials to ensure stable non-magnetic and sulfur resistance;

2. precision manufacturing process: the pipe body adopts "vacuum melting+integral forging", and the wall thickness uniformity is ≤± 0.5mm; the joint adopts friction welding process, and the tensile strength of the weld is ≥ the pipe body; The five axis machining center processes threads with accuracy up to API 7-1 standard;

3. full inspection and verification: all pass the permeability test (≤ 1.005 μ ₀), torsional strength test, hydraulic test (1.5 times the rated pressure), sulfur stress corrosion test (TC18 exclusive, NACE TM0177）、 Nondestructive testing (ut/mt/pt testing, no internal defects), and each drill collar is attached with a test report;

4. on site service guarantee: provide on-site acceptance guidance for drill collars, and assist in thread screwing torque calibration; Establish drill collar use files, regularly visit the use status, and provide maintenance suggestions.

Baoji Dingding titanium: the core supplier of titanium alloy non-magnetic drill collars

The company is located in Baoji high tech Zone, the "China Titanium Valley". It has been engaged in oil drilling titanium alloy products for 15 years. It has 3 special production lines for non-magnetic drill collars, with an annual production capacity of 10000. It has passed the ISO9001 quality management system, API 7-1 certification and the qualification review of PetroChina, Sinopec and CNOOC suppliers. The products have been applied to key projects such as Sichuan Chongqing shale gas field, Xinjiang ultra deep well, South China Sea deep-sea drilling, serving well-known enterprises such as COSL and Schlumberger, and becoming a trusted partner of non-magnetic drill collars for directional drilling.

Technical core: non magnetic performance control+sulfur resistance strengthening process

Capacity Guarantee: 1000 pcs/year, 45 days for urgent orders

Service advantage: 24-hour drilling condition adaptation support

Technical consultation: send drilling depth and operating parameters to 530975155@qq.com , get the adaptation scheme within 2 hours