Table 1 Well formation water, crude oil and natural gas fractions.

From: Failure analysis of 3Cr oil pipe body fracture

Formation water

Geology

Sampling date

Chloride ion

(mg/L)

Total mineralization

(mg/L)

Hydroentanglement

PH

C

2019-11-01

100,000

164,300

CaCl2

6.30

Crude oil

Geology

Sampling date

20℃ density

(g/cm3)

50℃ density

(g/cm3)

Dynamic viscosity

(mPa·s)

Deposit

(%)

C

2020-01-02

0.8649

0.8441

7.120

0.07

Asphaltene

(%)

Colloid

(%)

Sulfur content

(%)

Wax content

(%)

Freezing point

(℃)

/

9.37

1.22

0.510

9.800

−2.00

/

Natural gas

Geology

Sampling date

O2,

%(mol/mol)

CO2,

%(mol/mol)

H2S,

%(mol/mol)

N2,

%(mol/mol)

C

2020-01-03

0.9883

0.0210

0.0000

72.48