CN104989357A - Method for selecting refracturing target well of tight oil and gas reservoir - Google Patents
Method for selecting refracturing target well of tight oil and gas reservoir Download PDFInfo
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Abstract
The invention provides a method for selecting a refracturing target well of a tight oil and gas reservoir. The method comprises the following steps of: determining a well completion efficiency of a well to be screened; determining the unit reservoir quality of the well to be screened; using the unit reservoir quality as a horizontal ordinate and the well completion efficiency as a longitudinal ordinate to draw a scatter diagram of the well completion efficiency and the unit reservoir quality; using transverse and longitudinal division lines for dividing the scatter diagram of the well completion efficiency and the unit reservoir quality into four parts to form an intersection diagnosis diagram, wherein the left upper part of the intersection diagnosis diagram is a re-examination development necessity region; the right upper part of the intersection diagnosis diagram is a high-productivity well high-refracturing-risk region; the left lower part of the intersection diagnosis diagram is a current stage non-considering region; the right lower part of the intersection diagnosis diagram is an optimum refracturing well region; the transverse division lines select straight lines with the well completion efficiency being 50 percent; and the longitudinal division lines are selected according to economic benefits; performing judgment on the basis of the intersection diagnosis diagram; and completing the selection of the refracturing target well of the tight oil and gas reservoir. The method has the advantage that the refracturing target well can be fast and effectively selected.
Description
Technical field
The present invention relates to a kind of system of selection of target well, particularly a kind of system of selection of fine and close oil-gas reservoir refracturing target well, belongs to technical field of petroleum extraction.
Background technology
Fine and close Reservoir Development needs the support of hydraulic fracturing technology to obtain economy exploitation, and multiple fracturing technique refers to that the development well for pressure break carries out again pressure break to slow down its production decline and to increase potential production.US natural gas research institute (GRI, now be called gas technology academy GTI) potential production that the U.S.'s 48 mouthfuls of tight gas wells are improved by refracturing has been investigated in 1996, result shows that the potential production of these wells in 5 years has exceeded 1 Tcf.This research is also pointed out for certain oil field, and 85% of the potential production that refracturing increases comes from the well of 15%-20%.Therefore can the success of any refracturing engineering be the well that identify this 15%-20% from all existing wells.
Relatively mixed and disorderly to the industry experience of multiple fracturing technique both at home and abroad, early stage multiple fracturing technique mainly lays particular emphasis on for the relatively poor well of output in oil field, but the result of refracturing is disappointing, thinking of people's mistake is caused to improve the effect of recovery ratio by multiple fracturing technique and little.But show to cause the high-yield well in well that refracturing potential production is the highest those oil fields often through GTI years of researches and some successful refracturing Project cases.
Selection at present for refracturing target well generally has three kinds of methods: produce performance contrast, mode identification technology/Virtual Intelligent method, production type Curve Matching.Although effect is better compared with mode identification technology/Virtual Intelligent method and other two kinds of methods, but still do not have a kind of satisfactory can solve for different geologic feature and the method for refracturing target well can be selected fast from a large amount of fractured well.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of system of selection of fine and close oil-gas reservoir refracturing target well, the method can select the target well that can carry out refracturing fast and effectively.
In order to achieve the above object, the invention provides a kind of method selecting fine and close oil-gas reservoir refracturing target well, the method comprises the following steps:
Determine the completion efficiency of well to be screened;
Determine the unit reservoir quality of well to be screened;
With described unit reservoir quality for abscissa, described completion efficiency is ordinate, draws the scatter diagram of completion efficiency and unit reservoir quality;
Utilize horizontal dividing line and vertical dividing line that the scatter diagram of described completion efficiency and unit reservoir quality is divided into four parts, form friendship and paint diagnostic graph, the upper left that diagnostic graph is painted in described friendship is re-examine exploitation necessity region, upper right portion is that pressure break risk zones, bottom left section are do not consider region present stage and lower right-most portion is optimum fractured well region again to high-yield well height again, wherein, described horizontal dividing line chooses the straight line that completion efficiency is 50%, and vertical dividing line is chosen according to economic benefit;
Paint diagnostic graph based on friendship to judge, complete the selection of fine and close oil-gas reservoir refracturing target well;
When specifically judging, if certain a bite well to be screened is distributed in the re-examine exploitation necessity region that diagnostic graph is painted in described friendship, need to rethink that it carries out the necessity of refracturing exploitation;
Hand over the present stage of painting diagnostic graph not consider region if be distributed in, do not select as refracturing target well;
If be distributed in the high-yield well high pressure break risk zones again handed over and paint diagnostic graph, do not select as refracturing target well;
If be distributed in the optimum fractured well region again of handing over and painting diagnostic graph, it is best refracturing target well.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, the completion efficiency of described well to be screened obtains according to following formula: C
1=(A
f-A
f, min)/(A
f, max-A
f, min),
Wherein, A
ffor the pressure break gross area of every mouthful of well to be screened, unit is square feet, A
f, minfor the minimum value of the individual well pressure break gross area in all wells to be screened, unit is square feet, A
f, maxfor the maximum value of the individual well pressure break gross area in all wells to be screened, unit is square feet.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, the pressure break gross area A of every mouthful of well to be screened
f,
n is Number of Fractures, h
ffor fracture height, unit m; x
ffor fracture length, unit is m.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, the unit reservoir quality of described well to be screened obtains according to following formula:
If well to be screened is oil well, then
unit is bucket/acre foot,
If well to be screened is the natural gas well, then
unit is Mille Cubic Feet/acre foot,
Wherein,
for reservoir porosity; S
wfor the water saturation of well to be screened; B
ofor oil volume factor; B
gfor gas formation volume factor.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, when described longitudinal dividing line is chosen according to economic benefit, the economic benefit obtained after ensureing to carry out again pressure break is not less than the cost carried out again needed for pressure break.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, the economic benefit obtained after carrying out again pressure break obtains according to following formula:
Carry out again economic benefit=OOIP × ratio × oil price of can gathering that pressure break obtains, wherein, the fine and close oil-gas reservoir quality of the fine and close oil-gas reservoir area × fine and close oil-gas reservoir thickness × unit of OOIP=.
According to the specific embodiment of the present invention, vertical dividing line considers that economic benefit divides, concrete economic indicator can be carried out self-defined according to the different development cost of different geographical, specifically dividing according to different geologic features and economic boundaries, is that those skilled in the art can carry out analyzing and determining.Such as, the cost carried out again needed for pressure break is Y, the economic benefit that so Y≤carry out again pressure break obtains, the fine and close oil-gas reservoir quality × ratio × oil price of can gathering of i.e. Y≤fine and close oil-gas reservoir area × fine and close oil-gas reservoir thickness × unit, according to Y, fine and close oil-gas reservoir area, fine and close oil-gas reservoir thickness, can gather ratio and oil price, try to achieve the span of the fine and close oil-gas reservoir quality of unit, select a suitable numerical value to be the value of longitudinal dividing line in the span of unit fine and close oil-gas reservoir quality, generally choose the minimum value of the fine and close oil-gas reservoir quality of unit.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, before the completion efficiency determining well to be screened, first determine that the hole condition of well to be screened is good and can pressing crack construction be carried out.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, by linear flow and double-log plate, determine that the hole condition of well to be screened is good and can pressing crack construction be carried out.
In the present invention, according to linear flow and double-log plate, when determining that the hole condition of well to be screened is good and pressing crack construction can be carried out, carry out according to the mode of this area routine and determination methods.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, determining that the hole condition of well to be screened is good and after can carrying out pressing crack construction, before determining the completion efficiency of well to be screened, qualitative evaluation well capacity growth potential to be screened.
In the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, preferably, by the master data qualitative evaluation of well to be screened well capacity growth potential to be screened.
In the present invention, carried out according to operation conventional in this area by the master data qualitative evaluation of well to be screened well capacity growth potential to be screened.
The method of selection provided by the invention fine and close oil-gas reservoir refracturing target well, owing to having taken into full account fracturing engineering efficiency and reservoir production potential in earlier stage, therefore more tallies with the actual situation.The method mainly adopts data based on the completion parameter of well to be screened and unit reservoir quality.First define " completion efficiency " this parameter, completion efficiency characterizes the parameter relevant to pressure break reservoir reconstruction, as well completion type, singly stitches scale, pressure break progression etc.; Another important parameter is unit reservoir quality, the hydrocarbon content namely in unit area; Then diagnostic graph is painted by the friendship of unit reservoir quality and completion efficiency, in conjunction with real economy index boundary, well to be screened can be divided into " re-examine exploitation necessity " in handing over the diverse location painting diagnostic graph by well location to be screened, " present stage is not considered ", " high-yield well height is pressure break risk again ", " optimum is fractured well again " four regions, carrying out refracturing for lower step provides target well.
When specifically being selected by the method for selection provided by the invention fine and close oil-gas reservoir refracturing target well, if the point of certain a bite well to be screened is distributed in the upper left (re-examine exploitation necessity region) that diagnostic graph (as shown in Figure 1) is painted in above-mentioned friendship, then show that the oil pool distribution of this well is barren, but completion efficiency is high, need to rethink that it carries out the necessity of refracturing exploitation; If be distributed in the bottom left section (present stage does not consider region) handed over and paint diagnostic graph, then show that this well is stripper, present stage is not considered and carries out refracturing exploitation; If be distributed in the upper right portion (high-yield well height is pressure break risk zones again) handed over and paint diagnostic graph, then both oil reservoir was abundant to show this, and completion efficiency is high again, should be high-yield well, but if carry out refracturing, risk is higher; If be distributed in the lower right-most portion (optimum is fractured well region again) handed over and paint diagnostic graph, then show that this well oil reservoir enriches, and existing completion efficiency is not high, has the larger output rising space, is best refracturing target well.
In the method for the invention, if on the intersection that the result of calculation of certain mouthful of well drops on two regions or on the intersection point in four regions, make a decision again after then needing to examine closely further, on the intersection such as dropping on " present stage does not consider region " and " optimum is fractured well region again " namely on vertical dividing line, then determine its next step treatment measures after needing after waiting for a period of time its development effectiveness of close examination further again.
In the present invention, if without specified otherwise or definition, all parameter code names and computational methods thereof are all consistent with the definition of petrochemical industry and computational methods thereof, and those skilled in the art can determine its measurement and calculation method.
The method of selection provided by the invention fine and close oil-gas reservoir refracturing target well is mainly through definition completion efficiency parameter, bonding unit reservoir quality is assessed fractured well, the method is owing to having taken into full account that fracturing engineering efficiency and reservoir produce potential in earlier stage, more tally with the actual situation, the target well being applicable to carrying out refracturing can be filtered out fast and effectively from several thousand mouthfuls of wells.
Accompanying drawing explanation
Fig. 1 is that diagnostic graph is painted in the friendship of fine and close oil-gas reservoir completion efficiency and unit reservoir quality;
Fig. 2 is that diagnostic graph is painted in the completion efficiency of embodiment 1 and the friendship of unit reservoir quality.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
Present embodiments provide a kind of method selecting fine and close oil-gas reservoir refracturing target well, the method comprises the following steps:
Data acquisition and data quality control: data comprise geologic information, reservoir physics data, drilling well report, completion data etc.;
Carry out primary dcreening operation for well to be screened: first carry out fracturing effect analysis and rapid evaluation for certain shale gas reservoir pressure break horizontal well, related work is analyzed by linear flow and double-log plate.This stage is the primary dcreening operation stage, mainly determines that refracturing well also can carry out pressing crack construction for the hole condition of well, and in addition, this stage can also by the master data qualitative evaluation well capacity growth potential of well;
Completion efficiency and reservoir quality calculating is carried out: after above-mentioned primary dcreening operation, high level diagnostics can be carried out for the well by primary election and assess its early stage completion efficiency and potential production capacity based on primary dcreening operation result.Based on the oil reservoir collected and completion data, utilize above-mentioned completion efficiency and unit reservoir quality formula to obtain individual well completion efficiency and reservoir quality, result is as shown in table 1.
In table 1, A
fmaxrepresent the maximum value of the individual well pressure break gross area in all wells to be screened, namely from A
fthe maximum value that the inside is elected also is multiplied by the maximum pressure break area of 1.2 one of drawing, unit is square feet; A
fminrepresent the minimum value of the individual well pressure break gross area in all wells to be screened, namely from A
fthe minimum value elected of the inside divided by the minimum pressure break area of 1.2 one of drawing, unit is square feet.
Draw friendship and paint diagnostic graph: after obtaining completion efficiency and unit reservoir quality, horizontal dividing line gets the straight line that completion efficiency is 50%.In the present embodiment, economic boundaries being set as that hypothesis bores completion cost is 6,000,000 dollars, gas price is 4 dollars/Mille Cubic Feet, fine and close oil-gas reservoir area 40 acres, fine and close oil-gas reservoir thickness 300 feet, the fine and close oil-gas reservoir life-span is 30 years, and consider to reclaim in 3 years to bore completion cost, 3 years tar productivities are 30% in 30 years.Fine and close oil-gas reservoir quality >=6,000,000 dollar of then profit=40 × 300 × 10% × 30% × 4 × unit, limit based on above economic condition, and the fine and close oil-gas reservoir quality of unit, that is, vertical dividing line is decided to be 400 Mille Cubic Feets/acre foot.
The diagnostic graph marked off according to above constraints and individual well point, as shown in Figure 2.
Paint diagnostic graph based on friendship to select, selection result is as follows:
1, diagnostic graph is painted in the friendship drawn according to previous step, 3 mouthfuls (being No. 1, No. 5 and No. 6 wells respectively) are had to be positioned at bottom left section (present stage does not consider region) in 16 mouthfuls of wells, not only oil reservoir is of poor quality to show these wells, and fracturing effect is before also poor.Even if carry out refracturing for these wells perhaps can improve total completion time, but poor oil reservoir quality also can limit well capacity greatly, therefore should avoid carrying out refracturing for these wells; In this test, these wells are finally eliminated, not by pressure break again.
2,1 mouthful of well (No. 16) is had to be positioned at upper left (re-examine exploitation necessity region) in 16 mouthfuls of wells, show that the fracturing effect at these wells initial stage is good, but because reservoir is poor herein, be difficult to increase potential production capacity by further refracturing, because this mouthful of well has probably reached its maximum production capacity limit, therefore the development scheme of this kind of well reappraised and made corresponding adjustment; In this test, No. 16 wells do not enter pressure break yet again and choose category.
3,4 mouthfuls (being respectively No. 11, No. 12, No. 14 and No. 15) are had to be positioned at upper right portion (high-yield well height is pressure break risk zones again) in 16 mouthfuls of wells, the fracturing effect at these well initial stages is better and position reservoir quality is higher, therefore represents high-yield well.These wells are reasonable refracturing target well and have very large hope to improve production capacity further, but carry out refracturing for these wells and also there is greater risk, closing well during being refracturing on the one hand can cause higher production loss, the more important thing is if refracturing operation unsuccessfully can lose a bite high-yield well.Deposit due to these well high yields and excessive risk, therefore prudent refracturing is carried out to this kind of well.In this test, No. 11, No. 12, No. 14 and No. 15 wells are not chosen as pressure break object more yet.
4,8 mouthfuls (being respectively No. 2, No. 3, No. 4, No. 7, No. 8, No. 9, No. 10 and No. 13) are had to be positioned at the lower right-most portion (optimum is fractured well region again) of diagnostic graph in 16 mouthfuls of wells, the initial stage fracturing effect of this part well is poor, but be in the good position of reservoir, carry out refracturing for these wells and significantly can improve production capacity, therefore these wells are best refracturing target wells.In this test, No. 2, No. 3, No. 4, No. 7, No. 8, No. 9, No. 10 and No. 13 wells are chosen as pressure break object again.Consider for logistics and well site configuration, well 4,7,8 and 13 is divided into first group, and No. 2,3,9 and 10, well is divided into second group, all by pressure break again.Again after pressure break, every mouthful of well production all reaches first 2 times or higher of pressure break, and well yield peak value is up to 80% of the original output peak value of well.
Above-described embodiment shows that method provided by the invention tallies with the actual situation, and can select the target well that can carry out refracturing fast and effectively.
Claims (10)
1. select a method for fine and close oil-gas reservoir refracturing target well, the method comprises the following steps:
Determine the completion efficiency of well to be screened;
Determine the unit reservoir quality of well to be screened;
With described unit reservoir quality for abscissa, described completion efficiency is ordinate, draws the scatter diagram of completion efficiency and unit reservoir quality;
Utilize horizontal dividing line and vertical dividing line that the scatter diagram of described completion efficiency and unit reservoir quality is divided into four parts, form friendship and paint diagnostic graph; The upper left that diagnostic graph is painted in described friendship is re-examine exploitation necessity region, upper right portion is that pressure break risk zones, bottom left section are do not consider region present stage and lower right-most portion is optimum fractured well region again to high-yield well height again, wherein, horizontal dividing line chooses the straight line that completion efficiency is 50%, and vertical dividing line is chosen according to economic benefit;
Paint diagnostic graph based on friendship to judge, complete the selection of fine and close oil-gas reservoir refracturing target well;
When specifically judging, if certain a bite well to be screened is distributed in the re-examine exploitation necessity region that diagnostic graph is painted in described friendship, need to rethink that it carries out the necessity of refracturing exploitation;
Hand over the present stage of painting diagnostic graph not consider region if be distributed in, do not select as refracturing target well;
If be distributed in the high-yield well high pressure break risk zones again handed over and paint diagnostic graph, do not select as refracturing target well;
If be distributed in the optimum fractured well region again of handing over and painting diagnostic graph, it is best refracturing target well.
2. the method for selection according to claim 1 fine and close oil-gas reservoir refracturing target well, wherein, the completion efficiency of described well to be screened obtains according to following formula: C
i=(A
f-A
f, min)/(A
f, max-A
f, min);
Wherein, A
ffor the pressure break gross area of every mouthful of well to be screened, unit is square feet, A
f, minfor the minimum value of the individual well pressure break gross area in all wells to be screened, unit is square feet, A
f, maxfor the maximum value of the individual well pressure break gross area in all wells to be screened, unit is square feet.
3. the method for selection according to claim 2 fine and close oil-gas reservoir refracturing target well, wherein, the pressure break gross area of every mouthful of well to be screened is A
f,
n is Number of Fractures, h
ffor fracture height, unit m; x
ffor fracture length, unit is foot.
4. the method for selection according to claim 1 fine and close oil-gas reservoir refracturing target well, wherein, the unit reservoir quality of described well to be screened obtains according to following formula:
If well to be screened is oil well,
unit is bucket/acre foot,
If well to be screened is the natural gas well,
unit is Mille Cubic Feet/acre foot,
Wherein,
for reservoir porosity; S
wfor the water saturation of well to be screened; B
ofor oil volume factor; B
gfor gas formation volume factor.
5. the method for selection according to claim 1 fine and close oil-gas reservoir refracturing target well, wherein, when described longitudinal dividing line is chosen according to economic benefit, the economic benefit obtained after ensureing to carry out again pressure break is not less than the cost carried out again needed for pressure break.
6. the method for selection according to claim 5 fine and close oil-gas reservoir refracturing target well, wherein, the economic benefit obtained after carrying out again pressure break obtains according to following formula:
Carry out again economic benefit=OOIP × ratio × oil price of can gathering that pressure break obtains, wherein, the fine and close oil-gas reservoir quality of the fine and close oil-gas reservoir area × fine and close oil-gas reservoir thickness × unit of OOIP=.
7. the method for selection according to claim 1 fine and close oil-gas reservoir refracturing target well, wherein, before the completion efficiency determining well to be screened, first determines that the hole condition of well to be screened is good and can carry out pressing crack construction.
8. the method for selection according to claim 7 fine and close oil-gas reservoir refracturing target well, wherein, by linear flow and double-log plate, determines that the hole condition of well to be screened is good and can carry out pressing crack construction.
9. the method for selection according to claim 1 fine and close oil-gas reservoir refracturing target well, wherein, determining that the hole condition of well to be screened is good and after can carrying out pressing crack construction, before determining the completion efficiency of well to be screened, qualitative evaluation well capacity growth potential to be screened.
10. the method for selection according to claim 9 fine and close oil-gas reservoir refracturing target well, wherein, by the master data qualitative evaluation of well to be screened well capacity growth potential to be screened.
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