CN103334740B - Consider the method for the determination drainage front of free-boundary problem - Google Patents
Consider the method for the determination drainage front of free-boundary problem Download PDFInfo
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- CN103334740B CN103334740B CN201310292033.3A CN201310292033A CN103334740B CN 103334740 B CN103334740 B CN 103334740B CN 201310292033 A CN201310292033 A CN 201310292033A CN 103334740 B CN103334740 B CN 103334740B
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Abstract
The invention provides a kind of method considering the determination drainage front of free-boundary problem, the method comprises: step 1, obtains multiple formation physical property and fluid parameter according to result of log interpretation, completion geologic report, high pressure property analysis report; Step 2, determines system compressibility; Step 3, according to oil wells in low-permeability reservoirs production report and the extensive well testing test data of pressure, obtains tired product, pressure recover pressure reduction; Step 4, according to flow-after-flow test test data, draws the relation straight line of output and bottom hole pressure difference, determines the intercept of this straight line; And step 5, according to the parameter that step 1-4 obtains, determine oil wells in low-permeability reservoirs drainage front.The present invention has taken into full account the feature of low permeability reservoir and the practical performance data of producing well, improves the accuracy that oil wells in low-permeability reservoirs drainage front is determined.
Description
Technical field
The present invention relates to oil field development technical field, particularly relate to a kind of method considering the determination drainage front of free-boundary problem.
Background technology
The drainage front of oil wells in low-permeability reservoirs is the major parameter of development of low-permeability oil reservoir, directly affects the accuracy that in oil recovery, the injecting process, Well Pattern And Spacing is determined, and then affects the development effectiveness in oil field.Current oil wells in low-permeability reservoirs drainage front computational methods need determine formation effective permeability, and formation effective permeability can only be tested by well testing and carry out well test analysis and obtain.Low-permeability oil deposit due to permeability lower, well testing test is difficult to obtain has the data of radial flow feature, causes and is difficult to accurately obtain formation effective permeability value based on the well test analysis technology of radial flow characteristic theory at present.We have invented the new method not using formation effective permeability to calculate drainage radius for this reason, solve above technical problem.
Summary of the invention
The object of this invention is to provide a kind of practical performance data taking into full account low permeability reservoir feature and producing well, improve the method for the determination drainage front of the consideration free-boundary problem of oil wells in low-permeability reservoirs drainage front determination accuracy.
Object of the present invention realizes by following technical measures: the method considering the determination drainage front of free-boundary problem, the method of the determination drainage front of this consideration free-boundary problem comprises: step 1, obtains multiple formation physical property and fluid parameter according to result of log interpretation, completion geologic report, high pressure property analysis report; Step 2, determines system compressibility; Step 3, according to oil wells in low-permeability reservoirs production report and the extensive well testing test data of pressure, obtains tired product, pressure recover pressure reduction; Step 4, according to flow-after-flow test test data, draws the relation straight line of output and bottom hole pressure difference, determines the intercept of this straight line; And step 5, according to the parameter that step 1-4 obtains, determine oil wells in low-permeability reservoirs drainage front.
Object of the present invention also realizes by following technical measures:
The plurality of formation physical property and fluid parameter comprise degree of porosity Φ, Effective thickness of formation h, water saturation S
w, oil saturation S
o, well radius r
w, oil volume coefficient B
o, formation oil compression coefficient C
o, formation water compression coefficient C
w.
Parameter degree of porosity Φ is decimal, and Effective thickness of formation h unit is m, water saturation S
wfor decimal, oil saturation S
ofor decimal, well radius r
wunit is m, oil volume coefficient B
ounit be m
3/ m
3, formation oil compression coefficient C
ounit is MPa
-1, formation water compression coefficient C
wunit is MPa
-1.
In step 2, system compressibility C is determined
trelational expression be:
C
t=C
oS
o+C
wS
w+C
f
C
f=(2.587×10
-4)/Φ
0.4358
System compressibility C
t, stratigraphic compression coefficient C
funit is MPa
-1.
In steps of 5, oil wells in low-permeability reservoirs drainage front r is determined
ephysical relationship formula be:
wherein, a is the intercept of the relation straight line of this output and bottom hole pressure difference, q
cfor tired product, unit is m
3, △ p
wsfor pressure recover pressure reduction, unit is MPa, r
eunit is m.
The method of the determination drainage front of the consideration free-boundary problem in the present invention, result of calculation can be applicable to the determination of Well Pattern And Spacing in development plan compilation process, utilize the dynamic data that well testing is enrolled, determine oil wells in low-permeability reservoirs drainage front, reflection oil development situation that can be accurate, real-time, for development of low-permeability oil reservoir provides decision-making foundation, and then produce huge economic benefit, there is certain promotional value.
Accompanying drawing explanation
Fig. 1 is the flow chart of the specific embodiment of the method for the determination drainage front of consideration free-boundary problem of the present invention;
Fig. 2 is the relation straight line schematic diagram of output and bottom hole pressure difference (q ~ △ p) in a specific embodiment of the present invention.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of the method for the determination drainage front of consideration free-boundary problem of the present invention.
In step 101, multiple formation physical property and fluid parameter is obtained according to result of log interpretation, completion geologic report, high pressure property analysis report, in one embodiment, the plurality of formation physical property and fluid parameter comprise degree of porosity Φ, Effective thickness of formation h, water saturation S
w, oil saturation S
o, well radius r
w, oil volume coefficient B
o, formation oil compression coefficient C
o, formation water compression coefficient C
w.Wherein, parameter degree of porosity Φ is decimal, and Effective thickness of formation h unit is m, water saturation S
wfor decimal, oil saturation S
ofor decimal, well radius r
wunit is m, oil volume coefficient B
ounit be m
3/ m
3, formation oil compression coefficient C
ounit is MPa
-1, formation water compression coefficient C
wunit is MPa
-1.Flow process enters into step 102.
In step 102, determine system compressibility.In one embodiment, system compressibility C is calculated
trelational expression be:
C
t=C
oS
o+C
wS
w+C
f
C
f=(2.587×10
-4)/Φ
0.4358
System compressibility C
t, stratigraphic compression coefficient C
funit is MPa
-1, flow process enters into step 103.
In step 103, according to oil wells in low-permeability reservoirs production report and the extensive well testing test data of pressure, obtain tired product q
c, pressure recover pressure reduction △ p
ws.Wherein, tired product q
cunit is m
3, pressure recover pressure reduction △ p
wsunit is MPa.Flow process enters into step 104.
In step 104, according to flow-after-flow test test data, draw the relation straight line of output and bottom hole pressure difference (q ~ △ p), determine the intercept a of this straight line.Wherein, output q unit is m
3/ d, bottom hole pressure difference △ p unit is MPa.Flow process enters into step 105.
In step 105, calculate oil wells in low-permeability reservoirs drainage front r
e, physical relationship formula is:
Drainage front r
eunit is m, and flow process terminates.
In an application specific embodiment of the present invention, according to result of log interpretation, determine effecive porosity φ=0.0662, Effective thickness of formation h=29.0m, water saturation S
w=0.8640, oil saturation S
w=0.1360; According to completion geologic report determination well radius r
w=0.06985m; Determine that oil volume coefficient is B according to the report of high pressure property fluid analysis
o=1.456m
3/ m
3, formation oil compression coefficient C
obe 1.701 × 10
-3mPa
-1, formation water compression coefficient C
wbe 4.5 × 10
-4mPa
-1;
Calculate system compressibility C
t=14.64 × 10
-4mPa
-1;
Determine that this well is tired according to production report and produce qc=111.5m
3, according to pressure buildup test determination pressure recover pressure reduction p
ws=1.6048MPa;
By flow-after-flow test test data (see table 1), draw the relation straight line of q ~ △ p, see Fig. 2, obtaining this Linear intercept is 1.026;
Table 1
According to the parameter determined above, calculate oil wells in low-permeability reservoirs drainage front
Above-described embodiment is to illustrate the invention and not to limit the present invention.
Claims (2)
1. consider the method for the determination drainage front of free-boundary problem, it is characterized in that, the method for the determination drainage front of this consideration free-boundary problem comprises:
Step 1, obtains multiple formation physical property and fluid parameter according to result of log interpretation, completion geologic report, high pressure property analysis report, and the plurality of formation physical property and fluid parameter comprise well testing testing well sector hole porosity Φ, Effective thickness of formation h, water saturation S
w, oil saturation S
o, well radius r
w, oil volume coefficient B
o, formation oil compression coefficient C
o, formation water compression coefficient C
w;
Step 2, determines system compressibility, this system compressibility C
trelational expression be:
C
t＝C
oS
o+C
wS
w+C
f
C
f＝(2.587×10
-4)/Φ
0.4358
System compressibility C
t, stratigraphic compression coefficient C
funit is MPa
-1;
Step 3, according to oil wells in low-permeability reservoirs production report and the extensive well testing test data of pressure, obtains tired product, pressure recover pressure reduction;
Step 4, according to flow-after-flow test test data, draws the relation straight line of output and bottom hole pressure difference, determines the intercept of this straight line; And
Step 5, according to the parameter that step 1-4 obtains, determines oil wells in low-permeability reservoirs drainage front, this oil wells in low-permeability reservoirs drainage front r
ephysical relationship formula be:
wherein, a is the intercept of the relation straight line of this output and bottom hole pressure difference, q
cfor tired product, unit is m
3, Δ p
wsfor pressure recover pressure reduction, unit is MPa, r
eunit is m.
2. the method for the determination drainage front of consideration free-boundary problem according to claim 1, is characterized in that, parameter degree of porosity Φ is decimal, and Effective thickness of formation h unit is m, water saturation S
wfor decimal, oil saturation S
ofor decimal, well radius r
wunit is m, oil volume coefficient B
ounit be m
3/ m
3, formation oil compression coefficient C
ounit is MPa
-1, formation water compression coefficient C
wunit is MPa
-1.
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| CN103573263B (en) * | 2013-10-12 | 2016-04-27 | 中国石油化工股份有限公司 | The horizontal well stream of a kind of tight sandstone reservoir fracturing production is installed with meter method |
| CN104632158B (en) * | 2013-11-13 | 2017-02-08 | 中国石油化工股份有限公司 | Oil well response stage dividing and distinguishing method under carbon dioxide miscible displacement condition |
| CN104632194A (en) * | 2013-11-13 | 2015-05-20 | 中国石油化工股份有限公司 | Method for determining technical well spacing of low-permeability reservoir through system well testing |
| CN105604546B (en) * | 2015-12-18 | 2018-10-16 | 中国石油天然气股份有限公司 | Quantitative classification method for dual-medium carbonate reservoir |
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| CN202325491U (en) * | 2011-11-29 | 2012-07-11 | 西南石油大学 | Batch production simulating experimental facility of oil well with low-permeability reservoir |
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| RU2385413C1 (en) * | 2008-09-30 | 2010-03-27 | Шлюмберже Текнолоджи Б.В. | Method of evaluating current gas saturation in bottomhole zone of well in deposit of volatile oil |
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|---|---|---|---|---|
| CN202325491U (en) * | 2011-11-29 | 2012-07-11 | 西南石油大学 | Batch production simulating experimental facility of oil well with low-permeability reservoir |
Non-Patent Citations (3)
| Title |
|---|
| 低渗透油藏启动压力梯度新算法及应用;许建红等;《西南石油大学学报》;20070831;第29卷(第4期);64-66 * |
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