CN104564006B - A kind of hypotonic gas well fracturing water-yielding capacity determination methods - Google Patents
A kind of hypotonic gas well fracturing water-yielding capacity determination methods Download PDFInfo
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Abstract
A kind of hypotonic gas well fracturing water-yielding capacity determination methods, are related to hypotonic gas well fracturing water-yielding capacity to evaluate field, including：The natural gamma value of the hypotonic gas well different depth of pressure break is treated in measurement, and obtains change curve of the natural gamma value with depth；According to the change shape of natural gamma value curve, it is determined that the stratum aquatic products shape type for treating the hypotonic gas well of pressure break；The well logging total hydrocarbon detection numerical value of the hypotonic gas well different depth of pressure break is treated in measurement, and obtains change curve of the well logging total hydrocarbon detection numerical value with depth；Change curve of the numerical value with depth is detected with the change shape of depth and the well logging total hydrocarbon according to the gamma ray curve, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.The present invention determines the classification belonging to it according to the log and well logging total gas curve for the treatment of fractured layer position, and judges its post-fracturing water-yielding capacity, and well-log information and log data by most original are judged that accuracy rate is high.
Description
Technical field
Field is evaluated the present invention relates to hypotonic gas well fracturing water-yielding capacity, more particularly to a kind of hypotonic gas well fracturing produces water energy
Power determination methods.
Background technology
Low permeability gas reservoirs are being influenceed when hiding by reservoir properties and filling degree, and water-gas relation is complicated.Cause well logging
The layer position of gas-bearing formation is construed to, different degrees of product water occurs after pressure break.Well log interpretation is gas in often there is fractured layer position
Layer, but the substantial amounts of water of part well output and a small amount of gas after pressure break, have a strong impact on to the correct understanding of reservoir and evaluation and survey
Visit the progress of exploitation.
Influence after Fractured Gas Wells product water to production capacity is mainly reflected in than larger：First, after gas reservoir produces water, due to stratum water
Scurried into along crack (Thief zone), split gas reservoir, form Si Qi areas, reduce ultimate recovery.Typically pure gas drive gas reservoir is final
Recovery ratio may be up to 90%, and the average recovery ratio of water drive gas reservoir is only 40%~60%.Also more than 30% reserves due to
The separation of the flow domain and can not adopt out.2nd, after Gas well dewatering, in the presence of capillary force, one side encroached water is to crack two
Imbibition in the pore media of side, reduces gas flow passage in matrix；Back pressure in another aspect pit shaft produced by hydrops and
Reverse osmosis is formed near wellbore formation under the effect of microchannel capillary pressure and inhales water-blocking effect, gas well deliverability is reduced rapidly.3rd, gas well is produced
The permeability of gas phase is reduced after water, the pressure loss increase in flow event, gas well yield declines rapidly, enter successively decrease in advance
Phase.4th, gas well is constantly assembled due to water after producing water in shaft bottom, causes gas well liquid loading WGR to rise, can to gas well yield and
Production capacity, or even the implementation of the Reserves Assessment and development plan in whole gas field produces influence (correct understanding of the influence to reservoir).
It is accurate to judge gas well water-yielding capacity, preferred fractured layer position is instructed, reduce pressure break risk particularly important.Producing water at present
The main with good grounds water saturation of mode of ability prediction judges pressure break water-yielding capacity and is sentenced according to the fluid type of well log interpretation
Disconnected pressure break water-yielding capacity.
1) when irreducible water saturation is logged well to judge fractured layer water outlet risk using core experiment, due to different experiments side
The irreducible water saturation difference that method is obtained is big, it is difficult to determine the true irreducible water saturation value of reservoir, as shown in figure 1, obtain
The corresponding irreducible water saturation correlation of different permeabilities is poor.And due to reservoir point anisotropism, it is difficult to use segment rock core
Result characterizes the reservoir constraint water saturation of big section, due to lacking the well-log information of Fine structural interpretation, it is impossible to accurately judge containing for reservoir
Water and gas-bearing property, therefore qualitatively judge poor reliability with the forwarding method.
2) well log interpretation relies on substantial amounts of rock electricity data, due to lacking the data of this aspect for prospect pit, causes survey
Well explains conclusion variation, and the explanation results drawn in different times difference explanation personnel have larger difference, or even to fluid
Property judges to occur big change, and the part initial stage is construed to gas-bearing formation, the later stage re-recognize after may be air water with layer or water
Layer.Many hypotonic gas wells cause the fluid of output after pressure break quite different with intended result due to referring to well log interpretation achievement.And
And a property parameters are generally generally explained to big section sandstone in well log interpretation, because Effective Reservoirs governing factor is complicated, contain
Gas quantitative assessment difficulty is big, and prospect pit lacks effective rock electricity data, and part gas-bearing formation electrical property feature is not obvious, properties of fluid in bearing stratum
It is determined that difficult, Well log quantitative explanation is with a low credibility.For longitudinal layer that reservoir span is big, anisotropism is strong position, due to its physical property
Change greatly, cause water-gas distribution uneven.Such explanation masks center section and may produce the segment layer of water, causes to gas
Well pressure break water-yielding capacity judges inaccurate.
Current method quasi- Consideration when low-permeability fracturing gas well water-yielding capacity is qualitatively judged is few, true property is relatively low, causes
It is larger to producing knowable difference before and after pressure break, have impact on to the accurate understanding of reservoir and evaluation, increased pressure break risk.
The content of the invention
The technical problem to be solved in the present invention is：How to be reduced to rock in hypotonic gas well fracturing water-yielding capacity deterministic process
The heart tests the dependence with result of log interpretation, and raising judges the accuracy of low-permeability fracturing gas well water-yielding capacity.
In order to solve the above-mentioned technical problem, the invention provides a kind of hypotonic gas well fracturing water-yielding capacity determination methods, bag
Include：
The natural gamma value of the hypotonic gas well different depth of pressure break is treated in step A, measurement, and obtains the natural gamma value with depth
The change curve of degree；
Step B, the change shape according to natural gamma value curve, it is determined that the stratum aquatic products shape for treating the hypotonic gas well of pressure break
Type；
Step C, measurement treat the well logging total hydrocarbon detection numerical value of the hypotonic gas well different depth of pressure break, and obtain the detection of well logging total hydrocarbon
Numerical value with depth change curve；
Step D, detect numerical value with depth with the change shape of depth and the well logging total hydrocarbon according to the gamma ray curve
The change curve of degree, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.
Further, also include after step D：
According to the water-yielding capacity type for treating the hypotonic gas well of pressure break, the water-yielding capacity scope of Fractured Gas Wells is determined.
Further, in the step A, also measurement treats that the following one or more of the hypotonic gas well different depth of pressure break is surveyed
Quantifier：Numerical value resistivity, compensated neutron, the numerical value of density；Obtain resistivity curve and/or compensated neutron curve and/or density
Curve；
In the step B, the also comprehensive resistivity curve and/or compensated neutron curve and/or density curve are with depth
Change shape, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break；
In the step D, the also comprehensive resistivity curve and/or compensated neutron curve and/or density curve are with depth
Change shape, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.
Further, stratum aquatic products shape type includes irreducible water, intermediary water, occluded water and Free water；
Wherein, the irreducible water is that water is produced on the stratum that the development of reservoir micropore is caused；
The intermediary water produces water for the stratum that reservoir heterogeneity is caused；
The occluded water is that water is produced on the not enough stratum for being formed of gas reservoir filling degree；
The Free water is that water is produced on tectonic termination or the not enough stratum for being formed of source of the gas.
Further, water-yielding capacity type includes weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, owes full
Gassiness type and single peak gassiness type；
Wherein, the weak gassiness type is that, because reservoir properties are poor, gas charge pressure not enough, causes to enter reservoir when hiding
Gas flow it is few, reservoir gas-bearing saturation degree is low, and water saturation is high；It is only capable of seeing faint gas survey display during well logging；
Well logging morphologic appearance is：Gas saturation is less than the first saturation degree threshold value, in the well logging total hydrocarbon numerical value with depth
The well logging total hydrocarbon numerical value of change curve be entirely below the first total hydrocarbon threshold value；
The jagged peaks gassiness type is that, due to reservoir, the less reservoir gas-bearing property of thickness is good when causing into Tibetan,
Remaining position gas-bearing property is poor, low when high when in well logging, total hydrocarbon in gas logging shows；
Logging curve morphologic appearance is：Gas-bearing property in same set of sand body is different, in the well logging total hydrocarbon numerical value with depth
Change curve well logging total hydrocarbon numerical values recited alternately change；
The nearly full gassiness type is that, because reservoir properties are good, fully, overall gas-bearing property is good for gas charge when hiding, but
There is gas-bearing property at some positions slightly worse, total hydrocarbon in gas logging display is reduced, but the total hydrocarbon in gas logging display amplitude of entirety is higher, shaped form
State smooths full；
Logging curve morphologic appearance is：It is complete with the well logging total hydrocarbon numerical value of the change curve of depth in the well logging total hydrocarbon numerical value
Portion is higher than the second total hydrocarbon threshold value, or the well logging total hydrocarbon numerical value of certain section with the change curve of depth of the well logging total hydrocarbon numerical value is received
To the influence reduction of reservoir properties, but remainder is higher than the second total hydrocarbon threshold value, and well logging total hydrocarbon numerical value shows abnormal well section
Thickness is more than Sandstone Section thickness；
The deficient full gassiness type is that, because source of the gas is inadequate when hiding, gas is not by the initial condition whole displacements in reservoir
Out, cause part water movable, the gas-bearing property of reservoir is poor, therefore be smooth low value in total hydrocarbon in gas logging realization；
Logging curve morphologic appearance is：Well logging total hydrocarbon numerical value has display in Reservoir Section, in Reservoir Section top bottom well logging total hydrocarbon
Numerical value is less than the 3rd total hydrocarbon threshold value；In middle part, well logging total hydrocarbon numerical value is higher than the 4th total hydrocarbon threshold value；
The single peak gassiness type is that, because the preferable part thickness of reservoir properties is small, gas preferentially enters this when hiding
Layer；But influenceed by oil accumulation factor, remaining Reservoir Section is not filled completely by gas, therefore gas-bearing property is poor；Total hydrocarbon in gas logging is only in thing
The good part of property is higher, and remaining position is substantially without display；
Logging curve morphologic appearance is：Whole Sandstone Section well logging total hydrocarbon numerical value is less than the 5th total hydrocarbon threshold value, in the well logging
Total hydrocarbon numerical value is significantly raised with certain section of the change curve of depth of well logging total hydrocarbon numerical value, the peak value for occurring.
Further, the step for the treatment of the stratum aquatic products shape type of pressure break hypotonic gas well described in determining in step B includes：
B1, change shape and/or the benefit by the change shape of the gamma ray curve and the resistivity curve
Repay the indicatrix in the change shape of neutron curve and/or the change shape of the density curve and water-yielding capacity recognition template
Compare one by one；
B2, determination and the change shape of the gamma ray curve and the change shape of the resistivity curve and/or institute
The immediate one group of indicatrix of the change shape of change shape and/or the density curve of compensated neutron curve is stated, by institute
The corresponding stratum aquatic products shape type of indicatrix is stated as the stratum aquatic products shape type for treating the hypotonic gas well of pressure break.
Further, the step for the treatment of the water-yielding capacity type of pressure break hypotonic gas well described in determining in step D includes：
D1, contrast treat the gamma ray curve of fractured layer position, it is determined that analysis well section belongs to Sandstone Section, the well logging gas are surveyed
Total gas curve numerical value with change curve and the well logging total hydrocarbon of depth judge indicatrix in pressure break water-yielding capacity recognition template by
One compares；
D2, determination and the well logging total gas curve judge that pressure break water-yielding capacity is known with the variation characteristic and well logging total hydrocarbon of depth
Immediate one group of indicatrix in other template, treats that pressure break is low using the corresponding water-yielding capacity type of the indicatrix as described
The water-yielding capacity type of permeation well.
Further, the step of obtaining the water-yielding capacity recognition template includes：
Hypotonic gas well fracturing tested productivity information is collected, the natural gamma for counting the every kind of stratum aquatic products shape type of fracturing section is bent
Line is with the variation characteristic and the resistivity curve of depth with the variation characteristic and/or the compensated neutron curve of depth with depth
Variation characteristic and/or the density curve with depth variation characteristic；
According to statistical information, set up the gamma ray curve and the resistivity curve and/or the compensated neutron is bent
Line and/or the density curve are with the variation characteristic of depth and the corresponding relation of stratum aquatic products shape type；
The step for the treatment of the stratum aquatic products shape type of pressure break hypotonic gas well described in determining in step B includes：
Change shape according to the gamma ray curve for treating fractured layer position determines the position of Sandstone Section；
Change shape according to resistivity curve and compensated neutron curve primarily determines that stratum aquatic products shape type；
When the change shape of resistivity curve or compensated neutron curve only has one kind with the water-yielding capacity recognition template
When being consistent, judged with reference to the change shape of density curve, when density value is less than the first density threshold with resistivity curve
The stratum aquatic products shape type of determination is defined, when density value is higher than the stratum aquatic products that the first density threshold is determined with compensated neutron curve
Shape type is defined.
Further, the step of obtaining the pressure break water-yielding capacity recognition template includes：
Hypotonic gas well fracturing tested productivity information and well logging total hydrocarbon in gas logging information are collected, the every kind of water-yielding capacity of fracturing section is counted
The well logging total hydrocarbon value of type with depth variation characteristic；
According to statistical information, variation characteristic and water-yielding capacity type of the well logging total hydrocarbon in gas logging numerical value with depth are set up
Corresponding relation.
Further, the first saturation degree threshold value and the first total hydrocarbon threshold value are 5%.
Compared with prior art, determination methods proposed by the present invention, according to the natural gal of the log for treating fractured layer position
Horse, resistivity, compensated neutron, density or natural gamma and well logging total gas curve can determine the classification belonging to it, and judge
Its post-fracturing water-yielding capacity, well-log information and log data by most original are judged that accuracy rate is high.
Brief description of the drawings
Fig. 1 is the irreducible water saturation and permeability schematic diagram that different tests method proposed by the present invention is obtained；
Fig. 2 is the flow chart of a kind of hypotonic gas well fracturing water-yielding capacity determination methods of the embodiment of the present invention；
Fig. 3 is the first hypotonic gas well H1 wells fracturing section well logging complex chart of the embodiment of the present invention；
Fig. 4 is the first hypotonic gas well H1 wells Logging curve variation diagram of the embodiment of the present invention；
Fig. 5 is the second hypotonic gas well H2 borehole logging tools resultant curve variation diagram of the embodiment of the present invention；
Fig. 6 is the second hypotonic gas well H2 wells well logging total hydrocarbon change curve of the embodiment of the present invention；
Fig. 7 is the 3rd hypotonic gas well H3 wells well logging total gas curve variation diagram of the embodiment of the present invention；
Fig. 8 is the 4th hypotonic gas well H4 wells well logging total gas curve variation diagram of the embodiment of the present invention；
Fig. 9 is the 5th hypotonic gas well N1 borehole logging tool composite curve charts of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
As shown in Fig. 2 the embodiment of the present invention provides a kind of hypotonic gas well fracturing water-yielding capacity determination methods, including：
The natural gamma value of the hypotonic gas well different depth of pressure break is treated in step A, measurement, and obtains the natural gamma value with depth
The change curve of degree；
Step B, the change shape according to natural gamma value curve, it is determined that the stratum aquatic products shape for treating the hypotonic gas well of pressure break
Type；
Step C, measurement treat the well logging total hydrocarbon detection numerical value of the hypotonic gas well different depth of pressure break, and obtain the detection of well logging total hydrocarbon
Numerical value with depth change curve；
Step D, detect numerical value with depth with the change shape of depth and the well logging total hydrocarbon according to the gamma ray curve
The change curve of degree, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.
Wherein gamma ray curve numerical value is used to judge whether Reservoir Section belongs to sandstone reservoir, the inspection of Main Basiss well logging total hydrocarbon
Survey numerical value carries out the identification that well logging judges stratum aquatic products shape with the change shape of the change curve of depth.
Wherein, step A, B and step C, D do not have temporal sequencing in actual applications.
The research of well logging and technological parameter according to influence gas well fracturing production capacity shows that test section resistivity is to gas production
Significantly, as shown in table 1, the parameter that secondly can reflect on log is gamma ray curve, is successively afterwards for influence
GR、DEN、AC、CNL、SH.Therefore, in the qualitative analysis of Fractured Gas Wells aquifer yield, analysis resistivity curve, natural gamma are bent
Line, compensated neutron curve, density curve (AC curves are influenceed larger by borehole wall stability, and the difficulty that its value is accurately obtained is big,
Therefore reservoir properties are characterized using DEN curves), the corresponding curvilinear motion feature of Different Strata aquatic products shape can be found out.
Table 1 is based on the factors on productivity degree of association and sequence after the pressure of gray relative analysis method
Wherein, also include after step D：
According to the water-yielding capacity type for treating the hypotonic gas well of pressure break, the water-yielding capacity scope of Fractured Gas Wells is determined.
Further, in the step A, also measurement treats that the following one or more of the hypotonic gas well different depth of pressure break is surveyed
Quantifier：Numerical value resistivity, compensated neutron, the numerical value of density；Obtain resistivity curve and/or compensated neutron curve and/or density
Curve；
In the step B, the also comprehensive resistivity curve and/or compensated neutron curve and/or density curve are with depth
Change shape, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break；
In the step D, the also comprehensive resistivity curve and/or compensated neutron curve and/or density curve are with depth
Change shape, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.
Wherein, it is referred to as irreducible water when stratum water is not flowable in reservoir during production, is that the development of reservoir micropore is caused
Produce water in stratum；
Moveable water between sandstone is referred to as intermediary water, is that water is produced on the stratum that reservoir heterogeneity is caused；
Be not completely exhausted out for the water in sandstone by hydrocarbon gas when hiding, and causes gas reservoir water saturation referred to as occluded water high,
For water is produced on the not enough stratum for being formed of gas reservoir filling degree；
Only in certain a bit of gassiness in sandstone, remainder gas-bearing property difference causes stratum water to be movably referred to as Free water completely,
It is that water is produced on tectonic termination or the not enough stratum for being formed of source of the gas.
Wherein, water-yielding capacity type includes weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, deficient full gassiness
Type and single peak gassiness type；
The weak gassiness type is that, because reservoir properties are poor, gas charge pressure not enough, causes to enter the gas of reservoir when hiding
The scale of construction is few, and reservoir gas-bearing saturation degree is low, and water saturation is high；It is only capable of seeing faint gas survey display during well logging；
Well logging morphologic appearance is：Gas saturation is less than the first saturation degree threshold value, in the well logging total hydrocarbon numerical value with depth
The well logging total hydrocarbon numerical value of change curve be entirely below the first total hydrocarbon threshold value；
The jagged peaks gassiness type is that, due to reservoir, the less reservoir gas-bearing property of thickness is good when causing into Tibetan,
Remaining position gas-bearing property is poor, low when high when in well logging, total hydrocarbon in gas logging shows；
Logging curve morphologic appearance is：Gas-bearing property in same set of sand body is different, in the well logging total hydrocarbon numerical value with depth
Change curve well logging total hydrocarbon numerical values recited alternately change；
The nearly full gassiness type is that, because reservoir properties are good, fully, overall gas-bearing property is good for gas charge when hiding, but
There is gas-bearing property at some positions slightly worse, total hydrocarbon in gas logging display is reduced, but the total hydrocarbon in gas logging display amplitude of entirety is higher, shaped form
State smooths full；
Logging curve morphologic appearance is：It is complete with the well logging total hydrocarbon numerical value of the change curve of depth in the well logging total hydrocarbon numerical value
Portion is higher than the second total hydrocarbon threshold value, or the well logging total hydrocarbon numerical value of certain section with the change curve of depth of the well logging total hydrocarbon numerical value is received
To the influence reduction of reservoir properties, but remainder is higher than the second total hydrocarbon threshold value, and well logging total hydrocarbon numerical value shows abnormal well section
Thickness is more than Sandstone Section thickness；
The deficient full gassiness type is that, because source of the gas is inadequate when hiding, gas is not by the initial condition whole displacements in reservoir
Out, cause part water movable, the gas-bearing property of reservoir is poor, therefore be smooth low value in total hydrocarbon in gas logging realization；
Logging curve morphologic appearance is：Well logging total hydrocarbon numerical value has display in Reservoir Section, in Reservoir Section top bottom well logging total hydrocarbon
Numerical value is less than the 3rd total hydrocarbon threshold value；In middle part, well logging total hydrocarbon numerical value is higher than the 4th total hydrocarbon threshold value；
The single peak gassiness type is that, because the preferable part thickness of reservoir properties is small, gas preferentially enters this when hiding
Layer；But (as how much filled pressure, source of the gas) is influenceed by other oil accumulation factors, remaining Reservoir Section is not filled completely by gas, because
This gas-bearing property is poor；Total hydrocarbon in gas logging is only higher in the good part of physical property, and remaining position is substantially without display；
Logging curve morphologic appearance is：Whole Sandstone Section well logging total hydrocarbon numerical value is less than the 5th total hydrocarbon threshold value, in the well logging
Total hydrocarbon numerical value is significantly raised with certain section of the change curve of depth of well logging total hydrocarbon numerical value, the peak value for occurring.
The step for the treatment of the stratum aquatic products shape type of pressure break hypotonic gas well described in determining in step B includes：
It is B1, the numerical value of the gamma ray curve is bent with the change of depth with the change curve of depth, the resistivity
In the change curve and water-yielding capacity recognition template of line, the change curve of the compensated neutron and depth, the density and depth
Indicatrix compare one by one；
B2, determination and the gamma ray curve, the resistivity curve, the compensated neutron curve, the density are bent
Line with depth the immediate one group of indicatrix of change curve, using the corresponding stratum aquatic products shape type of the indicatrix as
The stratum aquatic products shape type for treating the hypotonic gas well of pressure break.
The step of obtaining the water mixing capability identification template includes：
Hypotonic gas well fracturing tested productivity information is collected, the natural gamma for counting the every kind of stratum aquatic products shape type of fracturing section is bent
Line with the variation characteristic of depth, the resistivity curve with the variation characteristic of depth, the compensated neutron curve with depth change
Change the variation characteristic of feature, the density curve with depth.
According to statistical information, the gamma ray curve, the resistivity curve, the compensated neutron curve, institute are set up
Density curve is stated with the variation characteristic of depth and the corresponding relation of stratum aquatic products shape type.
During recognition template, the change shape according to the gamma ray curve for treating fractured layer position determines the position of Sandstone Section
Put；
When the change shape of resistivity curve or compensated neutron curve only has one kind with the water-yielding capacity recognition template
When being consistent, judged with reference to the change shape of density curve, when density value is less than the first density threshold with resistivity curve
The stratum aquatic products shape type of determination is defined, when density value is higher than the stratum aquatic products that the first density threshold is determined with compensated neutron curve
Shape type is defined.
Occurrence of the stratum water in reservoir pore, mainly by the absorption institute of pore size, venturi and rock particles surface
Control.Genetic model and stratum water occurrence status according to aqueous gas-bearing formation, calmodulin binding domain CaM construction, RESERVOIR PORE STRUCTURE and heterogeneous
Stratum aquatic products shape is divided into four classes by situation, i.e., the layer that the development of reservoir micropore is caused irreducible water, reservoir heterogeneity are caused
Between water, the occluded water that gas reservoir filling degree is not enough to be formed, tectonic termination or the not enough Free water for being formed of source of the gas.
Summarized by tested productivity situation to early stage fractured well, with reference to the resistivity and gamma ray curve of fracturing section
Variation characteristic, sums up the corresponding Variation Features of various stratum aquatic products shapes as shown in table 2：
(1) irreducible water：Gamma ray curve is smooth low value, and the two ends of resistivity curve uprise to centre is smooth, mend
It is smooth low value (negative anomaly) that neutron is repaid in Reservoir Section.
(2) intermediary water：, locally there is high level in gamma ray curve generally low value, shows the increased spy of shale content
Point.Resistivity curve is presented obvious rhythm formula height to be changed.Compensated neutron curve on the whole based on negative anomaly, local well section
Occur rising and falling.
(3) occluded water：Gamma ray curve is smooth low value, and relative superiority or inferiority is low on resistivity curve.Compensated neutron curve exists
Resistivity well section negative anomaly high is obvious, its value increase of the low well section of resistivity.
(4) Free water：Gamma ray curve is smooth low value, and the increase of small range occurs in resistivity, and remainder is equal
It is low value.Only there is negative anomaly top is a bit of in compensated neutron, and bottom is low value.
The log of table 2 sets up water-yielding capacity recognition template
Change in practical application first according to natural gamma and resistivity curve form identify it belonging to stratum
Aquatic products shape type, and then qualitatively judge its aerogenesis and water-yielding capacity.
The step for the treatment of the water-yielding capacity type of pressure break hypotonic gas well described in determining in step D includes：
D1, contrast treat the gamma ray curve of fractured layer position, it is determined that analysis well section belongs to Sandstone Section, the well logging gas are surveyed
Total gas curve numerical value with change curve and the well logging total hydrocarbon of depth judge indicatrix in pressure break water-yielding capacity recognition template by
One compares；
D2, determination and the well logging total gas curve judge that pressure break water-yielding capacity is known with the variation characteristic and well logging total hydrocarbon of depth
Immediate one group of indicatrix in other template, treats that pressure break is low using the corresponding water-yielding capacity type of the indicatrix as described
The water-yielding capacity type of permeation well.
The step of obtaining the water-yielding capacity recognition template includes：
Hypotonic gas well fracturing tested productivity information is collected, the natural gamma for counting the every kind of stratum aquatic products shape type of fracturing section is bent
Line is with the variation characteristic and the resistivity curve of depth with the variation characteristic and/or the compensated neutron curve of depth with depth
Variation characteristic and/or the density curve with depth variation characteristic；
According to statistical information, set up the gamma ray curve and the resistivity curve and/or the compensated neutron is bent
Line and/or the density curve are with the variation characteristic of depth and the corresponding relation of stratum aquatic products shape type.
Gas detection logging is the component and its content by analyzing the fuel gas entered in drilling fluid in drilling process, analysis
Determine whether the oil-gas Layer of industrial value, that is to say, that by analyzing the content of gas in drilling fluid, can be with direct measurement stratum
In oil, the content of natural gas and its composition.The research for carrying out fluid identification of reservoir with well logging Gas logging data at present is more,
Application effect is preferable.Gas logging data during mainly due to well logging can accurately and really reflect reservoir properties and gas-bearing property.
Therefore carrying out gas well fracturing capability forecasting using total hydrocarbon in gas logging data has theoretical foundation.
The relation that production capacity according to actual hypotonic gas well fracturing changes with well logging total hydrocarbon (Tg), summarizes recognition template.According to
The different Changing Patterns of gamma ray curve and well logging total gas curve are divided into five types, are respectively：Weak gassiness type, jagged peaks
Value gassiness type, nearly full gassiness type, deficient full gassiness type, single peak gassiness type, sum up various stratum water-yielding capacity types pair
The Variation Features answered are as shown in table 3：
1) weak gassiness type：Natural gamma shows as sandstone features, and Tg values are very low, or surveys display without gas.
2) jagged peak gassiness type:There is small zigzag change in gamma ray curve curve, and multiple segments occurs in Tg
Peak value, remaining section is low value.
3) nearly full gassiness type：Locally there is small high level in gamma ray curve, but generally shows smooth low value.
Tg curves are full double-peak shape, show gas deliverability stronger.
4) full gassiness type is owed:Gamma ray curve is smooth low value, and Tg curves are low on Sandstone Section top, bottom also by
0 is gradually reduced to, middle nothing is higher by many times of peak value.
5) single peak gassiness type:Natural gamma is low value, belongs to typical sandstone features.Tg occurs small on the top of sand body
The peak value of section, extremely low value is shown in remainder, and the form for owing full is generally presented.
The hypotonic gas well fracturing water-yielding capacity template that the Logging curve of table 3 is set up
By treating fractured layer position using natural gamma, resistivity, compensated neutron, four kinds of log change shapes of density
Well logging belonging to identifying judges stratum aquatic products shape type, and the well logging identified by contrasting well logging total gas curve judges ground
Layer aquatic products shape type, two kinds of templates can all draw a water-yielding capacity for pressure break, choose two kinds of upper limits of result as product water energy
The upper limit of power, lower limit in two kinds of templates as this layer pressure break water-yielding capacity lower limit.Both approaches judge respectively in theory
Pressure break water-yielding capacity difference it is not too large, if occur conflicting, it may be possible to due to Logging curve receive non-reservoir because
The interference of element, should judge that stratum aquatic products shape type is defined to log well.
The embodiment of the present invention has the following advantages that：
The method that the embodiment of the present invention is used judges that parameter required during Fractured Gas Wells water-yielding capacity is few；Can be accurate
The water-yielding capacity of qualitative forecasting low-permeability fracturing gas well；The reservoir physical parameter and core experiment of various artificial explanations are not needed
Physical parameter, is more suitable for the few prospect pit of data and evaluates well；Pressure break well and story selecting can be instructed, evades pressure break risk, improved
The effective percentage of fracturing technology.
Embodiment one
The present embodiment illustrates determination methods provided in an embodiment of the present invention by taking marine first low permeability gas field H1 wells as an example.
Step 1：Well logging (.las forms) and the logging data of the hypotonic gas well of pressure break are treated in collection, and draw different depth oneself
Right gamma, resistivity (logarithmic scale), compensated neutron, variable density；
Step 2：Natural gamma, resistivity, compensated neutron, density curve variation characteristic and the present invention of fracturing section are treated in analysis
In log set up water-yielding capacity recognition template comparison, find out its stratum aquatic products shape type；
Step 3：The production capacity situation after being pressed during log sets up water-yielding capacity recognition template, qualitatively determines according to survey
The result that well curve is qualitatively judged；
Step 4：(well logging total hydrocarbon value is carved using logarithm with the curve of change in depth to draw natural gamma and well logging total hydrocarbon value
Degree).
Step 5：According to the hypotonic gas well fracturing water-yielding capacity Template Controls fractured interval natural gamma that Logging curve is set up
With the curvilinear motion form of well logging total hydrocarbon (Tg), the type belonging to it is found out；
Step 6：According to the total hydrocarbon type that Logging curve judges, qualitatively describe it and produce water and gas deliverability.
Step 7：With reference to the result that log and Logging curve are qualitatively judged, take aquifer yield value most as the upper limit (
Data is not full-time can also to be judged using one of which recognition template)
Above method has considered reservoir formation aquatic products shape (log), gas-bearing property (well logging total gas curve) and pressure break
The relation of water-yielding capacity, can accurately draw the product water risk after gas well fracturing afterwards.Common method is overcome to reservoir
The dependence of physical parameter and core experiment, accuracy has and significantly improves.
First low permeability gas field H1 fracturing sections are 4173-4186.5m.The reservoir permeability of well log interpretation is 2.9md, porosity
It is 10.1%, water saturation is 39.8%, well log interpretation conclusion is gas-bearing formation.The a length of 81m of fracturing fracture half.Using numerical simulation
Prediction productivity of fractured is 9 × 104m3/d, produces water 15m3/d.1.5 × 104m3/d of daily gas, does not produce water after actual pressure break.
Water-yielding capacity recognition template is set up using the log in the present invention, judges that the fracturing section is irreducible water occurrence
(Fig. 3), aerogenesis produces water and is less than 5m3/d less than 2 × 104m3/d after qualitatively judging its pressure break.It is small with actual test result difference.
The hypotonic gas well fracturing water-yielding capacity template for using Logging curve to set up judges that the layer is jagged peak gassiness type
(Fig. 4), belongs to nearly full gassiness type, and daily gas are less than 5 × 104m3/d, produces water and is less than 5m3/d, close with test result.
Therefore, water-yielding capacity after the pressure break of the well can be accurately judged using the method for the embodiment of the present invention.
Embodiment two
By taking marine second low permeability gas field H2 wells as an example, fracturing section is 3949.0-3979.9m.The reservoir infiltration of well log interpretation
Rate is 1.6md, and porosity is 10.2%, and water saturation is 43.8%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is a length of
140m.It is 8.2 × 10 to use numerical Simulation Prediction productivity of fractured4m3/ d, produces water 10m3/d.Daily gas 0.16 after actual pressure break ×
104m3/ d, produces water 60.1m3/d。
Water-yielding capacity recognition template is set up using the log in the present invention, judges that the fracturing section is occluded water occurrence
(Fig. 5), aerogenesis is less than 2 × 10 after qualitatively judging its pressure break4m3/ d, produces water and is more than 20m3/d.It is consistent with test result.
The hypotonic gas well fracturing water-yielding capacity template for using Logging curve to set up judges the layer to belong to deficient full gassiness type
(Fig. 6), daily gas are less than 1 × 104m3/ d, it is higher than 40m to produce water3/ d is close with test result.
Therefore, water-yielding capacity after the pressure break of the well can be accurately judged using the method for the embodiment of the present invention.
Embodiment three
By taking the low permeability gas field H3 wells of land the 3rd as an example, fracturing section is 3230-3270m.The reservoir permeability of well log interpretation is
1.02×10-3μm2, porosity is 13.35%, and water saturation is 46%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long
It is 120m.It is 6 × 10 to use numerical Simulation Prediction productivity of fractured4m3/ d, produces water 20m3/d.Daily gas 2.04 after actual pressure break ×
104m3/ d, produces water 1.8m3/d。
The hypotonic gas well fracturing water-yielding capacity template for using Logging curve to set up judges that the layer contains to belong to jagged peak
Gas type (Fig. 7), daily gas are less than 2-5 × 104m3/ d, produces water and is less than 5m3/ d is close with test result.
Example IV
By taking the low permeability gas field H4 wells of land the 4th as an example, fracturing section is 3520-3560m.The reservoir permeability of well log interpretation is
0.82×10-3μm2, porosity is 11.5%, and water saturation is 39%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long
It is 90m.It is 4 × 10 to use numerical Simulation Prediction productivity of fractured4m3/ d, produces water 16m3/d.Daily gas 0 × 10 after actual pressure break4m3/
D, produces water 7.75m3/d。
The hypotonic gas well fracturing water-yielding capacity template for using Logging curve to set up judges that the layer is weak gassiness type (Fig. 8), presses
Substantially not aerogenesis after splitting, produces water and is less than 5-10m3/ d is close with test result.
Embodiment five
By taking marine 5th low permeability gas field N1 wells as an example, fracturing section is 4231-4244m.The reservoir permeability of well log interpretation is
3.2md, porosity is 11.3%, and water saturation is 57%, and well log interpretation conclusion is gas-bearing formation.The a length of 142m of fracturing fracture half.
Using numerical Simulation Prediction productivity of fractured 9 × 104m3/ d, produces water 25m3/d.Daily gas 0 × 10 after actual pressure break4m3/ d, produces water
87.8m3/d。
Water-yielding capacity recognition template is set up using the log in the present invention, judges that the fracturing section is Free water occurrence
(Fig. 9), qualitatively judges after its pressure break not aerogenesis substantially, produces water and is more than 40m3/d.It is consistent with test result.Can be with according to this plate
As far as possible avoid select the stratum aquatic products shape reservoir carry out pressure break, to reduce pressure break risk.
The above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, reference only to preferred embodiment to this hair
It is bright to be described in detail.It will be understood by those within the art that, technical scheme can be modified
Or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should cover in claim model of the invention
In the middle of enclosing.
Claims (9)
1. a kind of hypotonic gas well fracturing water-yielding capacity determination methods, including：
Step A, measurement treat the natural gamma value and following one or more of the hypotonic gas well different depth of pressure break：Numerical value resistance
Rate, compensated neutron, the numerical value of density, and the natural gamma value is obtained with change curve, resistivity curve, the compensation of depth
Sub- curve and/or density curve；
Step B, the change shape according to natural gamma value curve, the comprehensive resistivity curve and/or compensated neutron curve and/
Or density curve is with the change shape of depth, it is determined that the stratum aquatic products shape type for treating the hypotonic gas well of pressure break；
Step C, measurement treat the well logging total hydrocarbon detection numerical value of the hypotonic gas well different depth of pressure break, and obtain well logging total hydrocarbon detection numerical value
With the change curve of depth；
Step D, detect numerical value with depth with the change shape of depth and the well logging total hydrocarbon according to the gamma ray curve
Change curve, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break；
Wherein, the step for the treatment of the stratum aquatic products shape type of pressure break hypotonic gas well described in determining in step B includes：
B1, by the change shape and/or the compensation of the change shape of the gamma ray curve and the resistivity curve
Indicatrix in the change shape and water-yielding capacity recognition template of the change shape of sub- curve and/or the density curve is one by one
Compare；
B2, determination and the change shape of the gamma ray curve and the change shape of the resistivity curve and/or the benefit
The immediate one group of indicatrix of the change shape of change shape and/or the density curve of neutron curve is repaid, by the spy
The corresponding stratum aquatic products shape type of curve is levied as the stratum aquatic products shape type for treating the hypotonic gas well of pressure break.
2. determination methods as claimed in claim 1, it is characterised in that：Also include after the step D：
According to the water-yielding capacity type for treating the hypotonic gas well of pressure break, it is determined that the water-yielding capacity model for treating the hypotonic gas well of pressure break
Enclose.
3. determination methods as claimed in claim 1 or 2, it is characterised in that：
In the step D, the change of the comprehensive resistivity curve and/or compensated neutron curve and/or density curve with depth is gone back
Change form, it is determined that the water-yielding capacity type for treating the hypotonic gas well of pressure break.
4. determination methods as claimed in claim 1 or 2, it is characterised in that：Stratum aquatic products shape type includes irreducible water, interlayer
Water, occluded water and Free water；
Wherein, the irreducible water is that water is produced on the stratum that the development of reservoir micropore is caused；
The intermediary water produces water for the stratum that reservoir heterogeneity is caused；
The occluded water is that water is produced on the not enough stratum for being formed of gas reservoir filling degree；
The Free water is that water is produced on tectonic termination or the not enough stratum for being formed of source of the gas.
5. determination methods as claimed in claim 1 or 2, it is characterised in that：Water-yielding capacity type includes weak gassiness type, jagged peaks
Value gassiness type, nearly full gassiness type, deficient full gassiness type and single peak gassiness type；
Wherein, the weak gassiness type is that, because reservoir properties are poor, gas charge pressure not enough, causes to enter the gas of reservoir when hiding
The scale of construction is few, and reservoir gas-bearing saturation degree is low, and water saturation is high；It is only capable of seeing faint gas survey display during well logging；
Well logging morphologic appearance is：Gas saturation be less than the first saturation degree threshold value, the well logging total hydrocarbon numerical value with depth change
The well logging total hydrocarbon numerical value for changing curve is entirely below the first total hydrocarbon threshold value；
The jagged peaks gassiness type is that, due to reservoir, the less reservoir gas-bearing property of thickness is good when causing into Tibetan, remaining
Position gas-bearing property is poor, low when high when in well logging, total hydrocarbon in gas logging shows；
Logging curve morphologic appearance is：Gas-bearing property in same set of sand body is different, the well logging total hydrocarbon numerical value with depth change
The well logging total hydrocarbon numerical values recited for changing curve alternately changes；
The nearly full gassiness type is that, because reservoir properties are good, fully, overall gas-bearing property is good for gas charge when hiding, but at certain
A little positions occur that gas-bearing property is slightly worse, and total hydrocarbon in gas logging display is reduced, but the total hydrocarbon in gas logging display amplitude of entirety is higher, and tracing pattern is put down
Cunning is full；
Logging curve morphologic appearance is：It is all high with the well logging total hydrocarbon numerical value of the change curve of depth in the well logging total hydrocarbon numerical value
In the second total hydrocarbon threshold value, or the well logging total hydrocarbon numerical value of certain section with the change curve of depth of the well logging total hydrocarbon numerical value is stored up
The influence reduction of layer physical property, but remainder is higher than the second total hydrocarbon threshold value, and well logging total hydrocarbon numerical value shows abnormal well section thickness
More than Sandstone Section thickness；
The deficient full gassiness type is that, because source of the gas is inadequate when hiding, gas does not go out the initial condition whole displacements in reservoir
Come, cause part water movable, the gas-bearing property of reservoir is poor, therefore be smooth low value in total hydrocarbon in gas logging realization；
Logging curve morphologic appearance is：Well logging total hydrocarbon numerical value has display in Reservoir Section, in Reservoir Section top bottom well logging total hydrocarbon numerical value
Less than the 3rd total hydrocarbon threshold value；In middle part, well logging total hydrocarbon numerical value is higher than the 4th total hydrocarbon threshold value；
The single peak gassiness type is that, because the preferable part thickness of reservoir properties is small, gas preferentially enters the layer when hiding；But
Influenceed by oil accumulation factor, remaining Reservoir Section is not filled completely by gas, therefore gas-bearing property is poor；Total hydrocarbon in gas logging is only good in physical property
Part is higher, and remaining position is substantially without display；
Logging curve morphologic appearance is：Whole Sandstone Section well logging total hydrocarbon numerical value is less than the 5th total hydrocarbon threshold value, in the well logging total hydrocarbon
Numerical value is significantly raised with certain section of the change curve of depth of well logging total hydrocarbon numerical value, the peak value for occurring.
6. determination methods as claimed in claim 1 or 2, it is characterised in that：The hypotonic gas well of pressure break is treated described in determining in step D
The step of water-yielding capacity type, includes：
D1, contrast treat the gamma ray curve of fractured layer position, it is determined that analysis well section belongs to Sandstone Section, by the well logging total hydrocarbon in gas logging
Curve numerical value judges that the indicatrix in pressure break water-yielding capacity recognition template compares one by one with the change curve of depth with well logging total hydrocarbon
Compared with；
D2, determination and the well logging total gas curve judge that pressure break water-yielding capacity recognizes mould with the variation characteristic and well logging total hydrocarbon of depth
Immediate one group of indicatrix in plate, the hypotonic gas of pressure break is treated using the corresponding water-yielding capacity type of the indicatrix as described
The water-yielding capacity type of well.
7. determination methods as claimed in claim 1, it is characterised in that：The step of obtaining the water-yielding capacity recognition template is wrapped
Include：
Collect hypotonic gas well fracturing tested productivity information, count the gamma ray curve of the every kind of stratum aquatic products shape type of fracturing section with
The variation characteristic of depth and the resistivity curve with depth variation characteristic and/or the compensated neutron curve with depth change
Change the variation characteristic of feature and/or the density curve with depth；
According to statistical information, set up the gamma ray curve and the resistivity curve and/or the compensated neutron curve and/
Or the density curve is with the variation characteristic of depth and the corresponding relation of stratum aquatic products shape type；
The step for the treatment of the stratum aquatic products shape type of pressure break hypotonic gas well described in determining in step B includes：
Change shape according to the gamma ray curve for treating fractured layer position determines the position of Sandstone Section；
Change shape according to resistivity curve and compensated neutron curve primarily determines that stratum aquatic products shape type；
When the change shape of resistivity curve or compensated neutron curve only has one kind to be consistent with the water-yielding capacity recognition template
When, judged with reference to the change shape of density curve, determined with resistivity curve when density value is less than the first density threshold
Stratum aquatic products shape type be defined, when the stratum aquatic products shape class that density value is determined higher than the first density threshold with compensated neutron curve
Type is defined.
8. determination methods as claimed in claim 6, it is characterised in that：The step of obtaining the pressure break water-yielding capacity recognition template
Including：
Hypotonic gas well fracturing tested productivity information and well logging total hydrocarbon in gas logging information are collected, the every kind of water-yielding capacity type of fracturing section is counted
Well logging total hydrocarbon value with depth variation characteristic；
According to statistical information, the variation characteristic for setting up the well logging total hydrocarbon in gas logging numerical value with depth is corresponding with water-yielding capacity type
Relation.
9. determination methods as claimed in claim 5, it is characterised in that：First saturation degree threshold value and the first total hydrocarbon threshold value are 5%.
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| CN111784065B (en) * | 2020-07-09 | 2021-04-16 | 东北石油大学 | Oil well productivity intelligent prediction method based on grey correlation |
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| CN114382460A (en) * | 2022-01-20 | 2022-04-22 | 中海石油(中国)有限公司上海分公司 | Logging evaluation method and device for water outlet result of low-permeability and compact gas reservoir |
| CN114991724B (en) * | 2022-06-17 | 2024-01-02 | 中海石油(中国)有限公司 | Dense gas well productivity prediction method and system |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |