Wax deposition in oil pipelines brings a critical operational challenge in the oil development, and the indirect thermal washing is a most common and effective method of wax cleaning. The temperature field in thermal washing is the basis for making a reasonable plan to wash and remove wax well. In this paper, the wells of sucker rod pump in Da Qing oil field are selected as research objects, a new method which is based on heat-fluid coupling method is proposed for predicting temperature field during the thermal washing process. The temperature field of the annulus of tubing and casing and the temperature field of the annulus of rod and tubing are simulated with different thermal washing parameters. In the indirect thermal washing, the temperature in annulus of tubing and casing gradually decreases from wellhead to the bottom, while the temperature in the annulus of rod and tubing increases from bottom to the wellhead. With the increase of temperature and flow rate of thermal washing fluid, the temperature in annulus of tubing and casing and the temperature in annulus of rod and tubing are both increasing, but the rise rate is different at different depths. Compared to the measured results, the coincidences rate is in the range of 93.67%–99.31%. The research results can guide effectively the thermal washing operation.

References

References
1.
Azevedo
,
L. F. A.
, and
Teixeira
,
A. M.
,
2003
, “
A Critical Review of the Modeling of Wax Deposition Mechanisms
,”
Pet. Sci. Technol.
,
21
(
3–4
), pp.
393
408
.
2.
Kelechukwu
,
E. M.
,
Al-Salim
,
H. S.
, and
Saadi
,
A.
,
2013
, “
Prediction of Wax Deposition Problems of Hydrocarbon Production System
,”
J. Pet. Sci. Eng.
,
108
(
15
), pp.
128
136
.
3.
Hamouda
,
A. A.
, and
Viken
,
B. K.
,
1993
, “
Wax Deposition Mechanism Under High-Pressure and Presence of Light Hydrocarbons
,”
Theater
,
35
(
2
), pp.
27
29
.
4.
Elsharkawy
,
A. M.
,
Al-Sahhaf
,
T. A.
, and
Fahim
,
M. A.
,
2000
, “
Wax Deposition From Middle East Crudes
,”
Fuel
,
79
(
9
), pp.
1047
1055
.
5.
Correra
,
S.
,
Fasano
,
A.
,
Fusi
,
L.
, and
Merino-Garcia
,
D.
,
2007
, “
Calculating Deposit Formation in the Pipelining of Waxy Crude Oils
,”
Meccanica
,
42
(
2
), pp.
149
165
.
6.
Agrawal
,
K. M.
,
Khan
,
H. U.
,
Surianarayanan
,
M.
, and
Joshi
,
G. C.
,
1990
, “
Wax Deposition of Bombay High Crude Oil Under Flowing Conditions
,”
Fuel
,
69
(
6
), pp.
794
796
.
7.
And
,
D. W. J.
, and
Weispfennig
,
K.
,
2005
, “
Effects of Shear and Temperature on Wax Deposition:  Coldfinger Investigation With a Gulf of mexico Crude Oil
,”
Energy Fuels
,
19
(
4
), pp.
1376
1386
.
8.
Haitao
,
L. I.
,
Jinyong
,
L. I.
,
Gaofeng
,
L. I.
,
Wang
,
Y.
,
Miao
,
Y.
, and
Zhang
,
G.
,
2013
, “
Thermal Wax Cleaning Technology of the Hollow Rod Without Cutting Production
,”
Oil Drilling Prod. Technol.
,
35
(
4
), pp.
117
118
.
9.
Cheng
,
Q. L.
,
Wang
,
X. X.
,
Li
,
X. L.
,
Sun
,
W.
, and
Meng
,
L. D.
,
2013
, “
Study of Wax Deposition Rate in Waxy Crude Oil Pipeline
,”
Appl. Mech. Mater.
,
401–403
, pp.
891
894
.
10.
Wang
,
Q.
,
Sarica
,
C.
, and
Chen
,
T.
,
2001
, “
An Experimental Study on Mechanics of Wax Removal in Pipeline
,”
ASME J. Energy Resour. Technol.
,
127
(
4
), pp.
302
309
.
11.
Ijeomah
,
C. E.
,
Dandekar
,
A. Y.
,
Chukwu
,
G. A.
,
Khataniar
,
S.
,
Patil
,
S. L.
, and
Baldwin
,
A. L.
,
2008
, “
Measurement of Wax Appearance Temperature Under Simulated Pipeline (Dynamic) Conditions
,”
Energy Fuels
,
22
(
4
), pp. 2437–2442.
12.
Huang
,
Q.
,
Wang
,
W.
,
Wenxing
,
Q. U.
,
Quan
,
P.
, and
Jun
,
F. U.
,
2013
, “
Wax Removal Strategy and Operation Parameters Optimization of Asai Pipeline
,”
J. Petrochem. Univ.
,
26
(
4
), pp.
42
47
.
13.
Jun-Gang
,
L. I.
,
Wang
,
Z. H.
,
Long
,
A. H.
,
Zhong
,
H. Y.
, and
Xiang-Long
,
Z.
,
2006
, “
Effect of Pipe Wall and Crude Oil Temperature on Wax Deposition in Pipeline Transportation
,”
J. Daqing Pet. Inst.
,
3
, pp. 21–23.
14.
Davidsen
,
S.
, and
Hamouda
,
A. A.
,
1999
, “
Innovative Method to Determine the Wax Content and the Wax Precipitation Temperature Simultaneously for Crude Oils at Pipeline Pressures
,”
Proteomics
,
6
(
Suppl. 2
), pp.
77
81
.
You do not currently have access to this content.