Sage Journals: Discover world-class research

Abstract

This study attempted to more accurately predict the production performance and recoverable reserves in the late development stage, by formulating a new expression of K_ro/K_rw versus S_w by regression for the whole relative permeability curve. Further, on the basis of the Buckley-Leverett's frontal-drive equation and the Welge's average water saturation equation, two kinds of new water flooding curve were derived from the new expression of K_ro/K_rw, which are more applicable for predicting the final recoverable reserve. The laboratory tests conducted in the study show that the new cubic water flooding curve R-f_w follows the experimental curve, and the the final oil recovery calculated in the tests are the amount predicted by the new water flooding curve. An oilfield case study was also carried out, which indicates that the economically recoverable reserve at the water cut of 98% is 2.789 × 10⁴ m³ through the new approach, which has the smallest percentage of error 0.12%.

Keywords

Relative permeability Water saturation Cubic expression Water flooding curve Recoverable reserve

References

Buckley

S.E.

and Leverett

M.C.

, 1942. Mechanism of fluid displacement in sands. Trans AIME 146, 107–116.

Chen

Y.Q.

, 1985. Derivation of relationship of water drive curves. Acta Petrolei Sinica 6(2), 69–78 (in Chinese with English abstract).

Chen

Y.Q.

, 1990. Standardized method of average relative permeability curve. Oil Industry Standard and Measurement 6(3), 6–9.

Chen

Y.Q.

, 1994. Classification, correlation and evaluation of water-drive performance curve analysis method. Xinjiang Petroleum Geology 15(4), 348–356 (in Chinese with English abstract).

Chen

Y.Q.

and Tao

Z.Q.

, 1997. Derivation of water drive curve at high water-cut stage and its analysis of upwarding problem. Fault-Block Oil & Gas Field 4(3), 19–24.

Chen

Y.Q.

, 2000. Calculation methods of recoverable reserves of oilfields. Xinjiang Petroleum Geology 21(2), 130–137.

Chen

Y.Q.

and Li

, 2004. Modern Petroleum Reservoir Engineering. Petroleum Industry Press, Beijing, pp. 137–146.

Craig

F.F.

, 1993. The Reservoir Engineering Aspects of Waterflooding. Society of Petroleum Engineers of AIME, New York, pp. 112–114.

Craft

B.C.

Hawkins

M.F.

and Terry

R.E.

, 1959. Applied petroleum reservoirs engineering (Vol. 9). New Jersey: Prentice-Hall Inc., Englewood Cliffs, pp. 340–341.

10.

Dong

D.P.

, 2007. A study of percolation rules of oil-water two-phase flow in low-permeability reservoirs. Chengdu University of Technology, Chengdu, pp. 60–62.

11.

Fan

Z.Y.

Yuan

X.C.

Liao

F.R.

and Shu

Q.L.

, 2005. Common Problems and solutions in plotting theoretical curves of water-cut vs. recovery percent of reserves. Oil & Gas Geology 26(3), 384–387 (in Chinese with English abstract).

12.

S.H.

Tian

C.B.

Shi

C.F.

J.G.

Zhang

Z.B.

and Fu

X.J.

, 2012. New understanding on water-oil displacement efficiency in a high water-cut stage. Petroleum Exploration and Development 39(3), 362–370.

13.

Jiang

H.Q.

Yao

and Jiang

R.Z.

, 2006. The Fundamental and Practice of Reservoir Engineering. China University of Petroleum Press, Dongying, pp. 239–241.

14.

L.L.

Song

K.P.

Gao

and Wang

P.Z.

, 2009. Water flooding behavior of high water-cut oilfield. Petroleum Drilling Techniques 37(3), 91–94 (in Chinese with English abstract).

15.

Q.Y.

Zhang

J.Q.

Deng

B.R.

Chang

J.H.

Liu

S.S.

and Xu

X.M.

, 2011. Grey decision-making theory in the optimization of strata series recombination programs of high water-cut oilfields. Petroleum Exploration and Development 38(4), 463–469.

16.

Liu

S.H.

J.W.

and Yang

R.F.

, 2011. Peculiar water-flooding law during high water-cut stage in oilfield. Chinese Journal of Hydrodynamics 26(6), 660–666 (in Chinese with English abstract).

17.

Song

Z.J.

Z.P.

Lai

F.P.

Liu

and Gan

H.H.

, 2013. Derivation of water flooding characteristic curve for high water-cut oilfields. Petroleum Exploration and Development 40(2), 216–223.

18.

Welge

H.J.

, 1952. A simplified method for computing oil recovery by gas or water drive. Journal of Petroleum Technology 4(04), 91–98.

19.

C.F.

Liu

H.X.

Qian

G.B.

and Qin

J.H.

, 2011. Microcosmic mechanisms of water-oil displacement in conglomerate reservoirs in Karamay Oilfield, NW China. Petroleum Exploration and Development 38(6), 725–732.

20.

Q.T.

, 1999. Characteristic of oil-water seepage flow for several important water drive curves. Acta Petrolei Sinica 20(1), 56–60 (in Chinese with English abstract).

21.

Q.T.

, 1998. Application of Zhang's water drive curve and its characteristics of oil-water seepage flow. Xinjiang Petroleum Geology 19(6), 508–529 (in Chinese with English abstract).

22.

Zou

C.Y.

Chang

Y.W.

Wang

G.H.

and Lan

L.F.

, 2011. Calculation on a reasonable production-injection well ratio in waterflooding oilfields. Petroleum Exploration and Development 38(2), 211–215.

New Expression of Oil/Water Relative Permeability Ratio vs. Water Saturation and its Application in Water Flooding Curve

Abstract

Keywords

References