Baoji Dingding titanium | Petroleum Instrument precision guarantee for exploration and detection of titanium alloy machined parts

In the whole process of well logging, logging and well testing for oil and gas exploration, the core processing parts of petroleum instruments are the "key barrier" to ensure data accuracy, which should not only resist 150MPa high pressure, 480 ℃ high temperature and H ɑ s strong corrosion, but also eliminate magnetic field interference. Relying on the whole industry chain capability of "China Titanium Valley", Baoji Dingding titanium focuses on TC4, TC11, TC18 special titanium alloys, takes API 11d1 standard as the guideline, and through the process of "five axis linkage processing+laser interference calibration", realizes the dimensional tolerance of machined parts ≤± 0.002mm, permeability ≤ 1.005 μ ₀, providing reliable support for high-end instruments such as logging while drilling tools and pressure sensors.

1、 Core performance advantages: three materials to solve the pain points of the instrument industry

TC4, TC11 and TC18 form a complementary performance system against the three major pain points of "magnetic interference misjudgment, corrosion failure and high temperature accuracy drift" of petroleum instruments, achieving a qualitative breakthrough over stainless steel and non-magnetic steel:

Ultra low magnetic interference free characteristics

TC4 (balanced strength and toughness type): magnetic permeability ≤ 1.003 μ ₀, tensile strength ≥ 960mpa, thermal deformation at 400 ℃ high temperature ≤ 0.003mm, suitable for conventional instruments in medium and deep wells, the magnetic measurement error is reduced by 80% compared with non magnetic steel, and the service life is extended by 3 times.

Extreme corrosion protection

TC11 (high temperature stable type): ti-6.5al-3.5mo composition, temperature resistance up to 500 ℃, high temperature creep rate of 5000 hours ≤ 0.001%/1000h, dimensional accuracy maintained it5 level in 3000m ultra deep well environment, weight reduced by 45% compared with high temperature alloy, and instrument downhole load reduced.

High temperature accuracy stability

TC18 (sulfur resistant and corrosion resistant type): ti-4.4al-4mo-2sn is optimized in composition, with sulfur resistance grade of SSC C110, no stress corrosion under the environment of 0.3MPa partial pressure of H ɑ s, and 5000 hours salt spray corrosion rate ≤ 0.00008mm/year. It is the exclusive choice for instruments in high sulfur gas fields.

High strength and lightweight

Common advantages: the density is 4.51g/cm ³, which is 45% lower than that of stainless steel, and the weight of a single set of logging tool parts is 3kg lower; the density of the surface oxide film is up to 99.9%, which can resist formation brine, Co ɑ and other corrosive media, and is suitable for the whole scene from land oil field to deep-sea exploration.

2、 Precise specification system: customized adaptation scheme according to instrument function

Combining the functional requirements of different instruments, matching exclusive materials and precise specifications to achieve "one piece one fit", covering the core functional modules of the instrument:

2、 Core application scenario: accurate matching of material properties and working conditions

1. logging while drilling: non magnetic and accurate guarantee of borehole trajectory

Logging while drilling (MWD) needs to transmit geomagnetic data in real time, and titanium alloy machined parts eliminate interference from the root:

-TC4 non-magnetic support is used for MWD of shale gas horizontal well, with permeability ≤ 1.003 μ ₀, so that the positioning error of borehole trajectory is reduced from 5cm to 1cm, the accuracy of reservoir hit is increased by 90%, and the oil production rate of single well is increased by 12%;

-The TC11 high-temperature shell is suitable for the 5000m ultra deep well logging tool. Under the high temperature of 480 ℃ and the pressure of 150MPa, the shell deformation is ≤ 0.005mm, which protects the stable operation of internal electronic components and improves the success rate of data transmission to 99.8%;

-TC18 sulfur resistant casing is used for Sichuan high sulfur gas field logging tool. It has no stress corrosion under the environment of 0.3MPa partial pressure of H ɑ s, no performance degradation during continuous operation for 2000 hours, and its service life is 8 times longer than that of stainless steel casing.

2. pressure monitoring: high precision components guarantee reservoir data

The downhole pressure gauge needs to maintain the detection accuracy in extreme environments, and the titanium alloy components realize the dual guarantee of "manufacturing resistance+accuracy":

-TC18 sensor diaphragm is used for shale gas well testing instrument, with 0.1mm ultra-thin thickness and RA ≤ 0.4 μ m polished surface, and pressure detection error ≤ 0.05%. It accurately captures reservoir micro pressure fluctuations and provides core data for fracturing scheme optimization;

-TC4 sensing chamber is suitable for conventional well pressure gauge, with tensile strength ≥ 960mpa and no deformation under 150MPa high pressure. Compared with stainless steel parts, the failure rate is reduced from 12% to 1.5%, and the annual maintenance cost is reduced by 60%.

3. fluid sampling: corrosion resistant sealing ensures accurate analysis

The formation fluid sampler needs to avoid material pollution and leakage. Titanium alloy components create a "clean+reliable" acquisition system:

-TC18 valve core is used for acid oil and gas field sampler. It is acid resistant and free of metal impurities. The deviation of fluid analysis data is ≤ 0.1%, which provides accurate basis for reservoir reserve assessment;

-TC4 valve seat is used together. After 100000 times of repeated switching, the roundness error of sealing surface is still ≤ 0.003mm, and the sampling success rate is increased from 92% to 99.5%.