CN105868558A - Method for evaluating profile control injectability of water injection well - Google Patents
Method for evaluating profile control injectability of water injection well Download PDFInfo
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- CN105868558A CN105868558A CN201610188677.1A CN201610188677A CN105868558A CN 105868558 A CN105868558 A CN 105868558A CN 201610188677 A CN201610188677 A CN 201610188677A CN 105868558 A CN105868558 A CN 105868558A
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- 238000002347 injection Methods 0.000 title claims abstract description 130
- 239000007924 injection Substances 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000010276 construction Methods 0.000 claims abstract description 44
- 230000009194 climbing Effects 0.000 abstract description 20
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract 2
- 238000009825 accumulation Methods 0.000 abstract 1
- 230000018109 developmental process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
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Abstract
The invention provides a method for evaluating the profile control injectivity of a water injection well, which comprises the following specific processes of firstly obtaining a data sequence of profile control injection pressure and corresponding time and drawing a relation curve of the data sequence, then carrying out area integration on a relation function of the injection pressure changing along with time, and dividing the area integration by corresponding accumulation time to finally obtain a profile control injection pressure index. The invention reflects the injection property of the profile control agent, the relative development degree of a reservoir dominant cross flow channel, the magnitude of permeability grade difference and the like through the magnitude of the profile control injection pressure index, and provides guidance for the decision of the profile control process; meanwhile, data required by profile control injection pressure index calculation are simple and convenient to record, and compared with the traditional 'climbing pressure' parameter, the method can reflect the dynamic change of the profile control construction pressure more accurately, and has stronger practicability on evaluating the profile control process technology and the implementation effect.
Description
Technical Field
The invention belongs to the technical field of oil extraction processes, and particularly relates to a method for evaluating the profile control injectivity of a water injection well by adopting an injection pressure index, which is used for evaluating the injectivity of profile control construction and the change rule of construction pressure.
Background
In the process of water injection development of an oil field, due to the existence of reservoir heterogeneity and cracks, the injected water is unevenly propelled to easily form a dominant water flow channel or suddenly advances along the cracks, so that the water content of an oil well continuously rises, and the chemical profile control technology becomes an important means for controlling the water content of the oil well.
The profile control injection pressure is an important construction parameter in the process of profile control operation and is also an important technical reference index for evaluating the performance of profile control implementation.
At present, the evaluation and analysis means of injection pressure in the profile control construction process is single, and the parameter of 'climbing pressure' is mainly used for quantitative evaluation of the injection property of the profile control. The climbing pressure is simple to calculate, namely the difference between the injection pressure at the end of profile control construction and the initial injection pressure of construction. The climbing pressure reflects the speed of pressure rise in the injection process of the profile control agent to a certain extent. The lower the climbing pressure is, the stronger the reservoir heterogeneity is, the relative development of the dominant cross flow channel is and the better the injection property of profile control construction is; on the contrary, the reservoir heterogeneity is relatively weaker, the dominant channeling flow channel is relatively undeveloped, and the injection performance of profile control construction is relatively poorer.
However, the climbing pressure can only reflect the change of the injection pressure at the beginning and the end of the profile control, is a relatively static parameter, and cannot completely reflect the dynamic change characteristics and rules of the injection pressure along with the time in the construction process.
In fact, the change rule of the injection pressure along with the time in the profile control construction process is complex, the injection pressure rises at different speeds in various stages of the construction and the change rule of the pressure are different, the corresponding injection pressure curve forms are also different, and the construction injectivity is difficult to judge when the climbing pressure is the same. Therefore, the profile control implementation effect cannot be accurately reflected by adopting the conventional climbing pressure calculation to evaluate the profile control injectability.
Disclosure of Invention
The invention aims to provide a method for evaluating the profile control injectivity of a water injection well, which can more accurately reflect and evaluate the profile control injectivity and the climbing pressure level by using an injection pressure index so as to provide a guide basis for the technical decision of a profile control process and the analysis of a profile control effect.
The technical scheme of the invention provides a method for evaluating the profile control injectability of a water injection well, which comprises the following steps:
1) recording injection pressures P corresponding to different times t in profile control construction process of different target water injection wellstOf the data sequence of (1), initialInjection pressure of P0；
2) Drawing a curve by taking time as an abscissa and injection pressure as an ordinate of the data sequence recorded in the step 1);
3) calculating a profile control injection pressure index f according to the curve chart drawn in the step 2)pA value;
profile control injection pressure index in the above step 3)Wherein,represents the profile control initial injection pressure from P in the time period of 0 to t0Is raised to PtIs integrated.
The construction period t is 20-40 days.
Preferably, the construction period t is 28 days and 30 days.
4) According to profile control injection pressure index fpAnd evaluating the profile control injectivity of the water injection well. In general, fpThe larger the value is, the higher the climbing pressure of profile control construction is, and the worse the injectability of the profile control agent is; otherwise, fpThe smaller the value, the lower the climbing pressure, and the better the profile control agent injectability.
According to the profile control injection pressure index f in the step 4)pThe method for evaluating the profile control injectivity of the water injection well comprises the following steps: comparing profile injection pressure index f for two target injection wellspMagnitude of value, fpThe target well with small value has good profile control injectivity. For three or more target water injection wells, f is obtainedpThen f of each target wellpValue and fpThe average values are compared, and the profile control injectability below the average values is good, and the profile control injectability above the average values is poor.
The above injection pressure PtMeasured by a pump injection pressure gauge on a profile control pump or a wellhead pressure gauge of a water injection wellAnd (5) obtaining the product.
The invention has the beneficial effects that: the method for evaluating the profile control injectivity of the water injection well provided by the invention utilizes the profile control injectivity pressure index to reflect and evaluate the profile control injectivity and the climbing pressure level, compared with the traditional 'climbing pressure' parameter, the method can more accurately reflect the change rule of the profile control construction pressure, and has stronger practicability on evaluating the profile control process technology and the profile control implementation effect; meanwhile, the data required by the profile control injection pressure index calculation is simple and convenient to record.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a profile control injection pressure curve for a water injection well;
FIG. 2L 22-08 well profile injection pressure curve;
FIG. 3L 20-08 well profile injection pressure curve;
FIG. 4L 24-06 well profile injection pressure curve;
FIG. 5X 88-30 well profile control injection pressure curve;
FIG. 6X 86-22 well profile injection pressure curve.
Detailed Description
Example 1:
in order to overcome the problem that the existing climbing pressure cannot completely reflect the dynamic change characteristics and rules of the injection pressure along with the time in the construction process, the embodiment provides a method for evaluating the profile control injectivity of a water injection well, which comprises the following steps:
1) recording different targets in the profile control construction process of water injection wellInjection pressure P corresponding to time ttThe initial injection pressure is P0。
2) Drawing a curve by taking time as an abscissa and injection pressure as an ordinate of the data sequence recorded in the step 1); as shown in fig. 1, where X-axis is time and Y-axis is pressure; construction injection pressure profile control initial pressure P within t time0Injection pressure P at the end of profile control construction rising to t timetFor illustration, the following auxiliary lines are required: the crossing time point t is a straight line (dotted line) parallel to the Y axis and intersects the injection pressure curve at a point M, and is connected with MPtOver P0The points are taken as straight lines (dashed lines) perpendicular to the Y-axis and compare to the straight line tM to the point N.
3) Calculating a profile control injection pressure index f according to the curve chart drawn in the step 2)pThe value, i.e. the ratio of the shaded area in fig. 1 to the time of the construction period t.
4) Comparing profile control injection pressure index f of different target water injection wellspThe value of which is based on the profile injection pressure index fpAnd evaluating the profile control injectivity of the water injection well.
Wherein, as an embodiment, the profile control injection pressure indexWherein,represents the profile control initial injection pressure from P in the time period of 0 to t0Is raised to PtIs integrated, i.e. P in FIG. 10Area enclosed by Mt 0; p0the value of t is P in FIG. 10Nt 0.
And during the time t, profile control injection pressure index fpThe higher the climbing pressure of the profile control construction is, the better the injection performance of the profile control agent is, the relative development of the reservoir advantage channeling flow channel is reflected, the permeability grade difference is large, and the requirement on the plugging strength of the profile control agent is relatively high; otherwise, the lower the climbing pressure is, the lower the pressure isThe worse the in-use performance, the relatively undeveloped the dominant cross flow channel, the small difference of permeability and the relatively lower requirement on the plugging strength of the profile control agent.
Example 2:
and calculating specific examples of two profile control wells of the same oil reservoir.
1) Target well L22-08 Profile control initial injection pressure P0The construction time t is 28 days and is 12.8 MPa; target well L20-08 Profile control initial injection pressure P012.5MPa and the construction time t is 28 days. Profile control injection pressure P corresponding to two wellstThe data sequence of (a) is as in table 1 below.
TABLE 1
2) And (3) drawing a curve by taking the construction period as an abscissa and the injection pressure as an ordinate of the data sequence recorded in the step 1) in the table 1. The L22-08 well corresponds to FIG. 2, and the L20-08 well corresponds to FIG. 3.
3) Calculating a profile control injection pressure index f according to the curve chart drawn in the step 2)pThe value is the ratio of the shaded area in fig. 2 and 3 to the construction period. I.e. profile control injection pressure indexWherein,represents the profile control initial injection pressure from P in the time period of 0 to t0Is raised to PtIs integrated, i.e. the hatched areas in fig. 2 and 3, respectively; p0t value is respectivelyThe rectangular area in the lower portion of the hatching in fig. 2 and 3. Finally obtaining f of L22-08 wellp0.9518, L20-08 well fpIs 1.0161.
4) F of L22-08 well at the same level of climbing pressure (2.7 MPa for L22-08 and 2.5MPa for L20-08)pValue ratio L20-08 well fpThe small values indicate that the L22-08 well profile injection is better than the L20-08 well.
Example 3:
and calculating specific examples of the three profile control wells of the same oil reservoir.
1) Target well L22-08 Profile control initial injection pressure P0The construction time t is 28 days and is 12.8 MPa; target well L20-08 Profile control initial injection pressure P012.5MPa and the construction time t is 28 days. Target well L24-06 Profile control initial injection pressure P0The construction time t is 28 days and is 13.0 MPa. Profile control injection pressure P corresponding to three wellstThe data sequence of (a) is as follows in table 2.
TABLE 2
2) And (3) drawing a curve by taking the construction period as an abscissa and the injection pressure as an ordinate of the data sequence recorded in the step 1) in the table 2. The L22-08 well corresponds to FIG. 2, the L20-08 well corresponds to FIG. 3, and the L24-06 well corresponds to FIG. 4.
3) Calculating a profile control injection pressure index f according to the curve chart drawn in the step 2)pThe value, i.e. the ratio of the shaded area in fig. 2, 3 and 4 to the construction period. I.e. profile control injection pressure indexWherein,represents profile control in the time range of 0 to tInitial injection pressure from P0Is raised to PtIs integrated, i.e. the hatched areas in fig. 2, 3 and 4, respectively; p0the value of t is the area of the rectangle shaded in fig. 2, 3 and 4, respectively. Finally obtaining f of L22-08 wellp0.9518, L20-08 well fp1.0161, L24-06 well fpIs 0.7714.
4) In three wells, f of L24-06 well is in the state of corresponding climbing pressure level (L22-08 is 2.7MPa, L20-08 is 2.5MPa, L24-06 is 2.6 MPa)pMinimum value, f of L22-08 wellpSecond order, f for the L20-08 wellpThe largest value indicates that the injection property of the L24-06 well is the best, the injection property of the L22-08 well is the second best, and the injection property of the L20-08 well is the worst.
Example 4:
and calculating specific examples of two profile control wells of the same oil reservoir.
1) Target well X88-30 Profile control initial injection pressure P010.5MPa, and the construction time t is 30 days; target well X86-22 profile control initial injection pressure P010.4MPa, and the construction time t is 30 days. Profile control injection pressure P corresponding to two wellstThe data sequence of (a) is as in table 3 below.
TABLE 3
2) And (3) drawing a curve by taking the construction period as an abscissa and the injection pressure as an ordinate of the data sequence recorded in the step 1) in the table 3. The X88-30 wells correspond to FIG. 5 and the X86-22 wells correspond to FIG. 6.
3) The graph meter drawn according to the step 2)Calculating profile control injection pressure index fpThe value, i.e., the ratio of the shaded area in fig. 5 and 6 to the construction period. I.e. profile control injection pressure indexWherein,represents the profile control initial injection pressure from P in the time period of 0 to t0Is raised to PtIs integrated, i.e. the hatched areas in fig. 5 and 6, respectively; p0the value of t is the area of the rectangle shaded in fig. 5 and 6, respectively. Finally obtaining f of X88-30 wellp0.1917, X86-22 well fpIs 0.3750.
4) When the climbing pressure level is corresponding (X88-30 is 1.5MPa, X86-22 is 1.5MPa), f of X88-30 wellpValue ratio X86-22 well fpThe small values indicate that the X88-30 well profile injection is better than the X86-22 well.
Therefore, the profile control injection pressure index can reflect the injection performance of a profile control agent, the relative development degree of a reservoir dominant cross flow channel, the magnitude of permeability grade difference and the like, and provides guidance for the decision of a profile control process.
The method for evaluating the profile control injectivity of the water injection well has the advantages that data required by profile control injectivity index calculation are simple and convenient to record, compared with the traditional 'climbing pressure' parameter, the method can more accurately reflect the change rule of the profile control construction pressure, and the method has stronger practicability for evaluating the profile control process technology and the profile control implementation effect.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (8)
1. A method for evaluating the profile control injectivity of a water injection well is characterized by comprising the following steps: the method comprises the following steps:
1) recording injection pressures P corresponding to different construction periods t in profile control construction processes of different target water injection wellstThe initial injection pressure is P0；
2) Drawing a curve by taking time as an abscissa and injection pressure as an ordinate of the data sequence recorded in the step 1);
3) calculating a profile control injection pressure index f according to the curve chart drawn in the step 2)pA value;
4) comparing profile control injection pressure index f of different target water injection wellspThe value of which is based on the profile injection pressure index fpAnd evaluating the profile control injectivity of the water injection well.
2. The method of evaluating injection well profile control injectivity of claim 1, wherein: profile control injection pressure index in the step 3)Wherein,represents the profile control injection pressure from the initial injection pressure P in the construction period of 0 to t0Up to the injection pressure PtIs integrated.
3. The method of evaluating injection well profile control injectivity of claim 1, wherein: the construction period t is 20-40 days.
4. The method of evaluating injection well profile control injectivity of claim 3, wherein: the construction period t is 28 days.
5. The method of evaluating injection well profile control injectivity of claim 3, wherein: the construction period t is 30 days.
6. The method of evaluating injection well profile control injectivity of claim 1, wherein: for two target water injection wells in the step 4), injecting pressure index f according to profile controlpThe method for evaluating the profile control injectivity of the water injection well comprises the following steps: comparison of profile control injection pressure index fpMagnitude of value, fpThe target well with small value has good profile control injectivity.
7. The method of evaluating injection well profile control injectivity of claim 1, wherein: for the target water injection wells with three or more ports in the step 4), injecting pressure index f according to profile controlpThe method for evaluating the profile control injectivity of the water injection well comprises the following steps: calculating three or more target water injection wells fpThen f of each target wellpValue and fpThe average values are compared, and the profile control injectability below the average values is good, and the profile control injectability above the average values is poor.
8. The method of evaluating injection well profile control injectivity of claim 1, wherein: the injection pressure PtThe profile control pump is obtained by measuring a pump injection pressure gauge on the profile control pump or a wellhead pressure gauge of the water injection well.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109577945A (en) * | 2018-11-30 | 2019-04-05 | 西南石油大学 | A kind of experimental provision and method of hypotonic-Oil in Super-low Permeability oil reservoir fluid-channeling channel differentiation |
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| CN109577945A (en) * | 2018-11-30 | 2019-04-05 | 西南石油大学 | A kind of experimental provision and method of hypotonic-Oil in Super-low Permeability oil reservoir fluid-channeling channel differentiation |
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Application publication date: 20160817 |