CN104564006A - Hypotonic gas well fracturing water-producing capacity judgment method - Google Patents
Hypotonic gas well fracturing water-producing capacity judgment method Download PDFInfo
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Abstract
The invention discloses a hypotonic gas well fracturing water-producing capacity judgment method, and relates to the hypotonic gas well fracturing water-producing capacity evaluation field. The method comprises the following steps: measuring natural gamma values of a to-be-fractured hypotonic gas well in different depths, and acquiring a curve of the natural gamma values along the depth change; according to the change form of the natural gamma value curve, determining a stratum water-producing type of the to-be-fractured hypotonic gas well; measuring logging total hydrocarbon detection numerical values of the to-be-fractured hypotonic gas well in different depths, and acquiring the curve of the logging total hydrocarbon detection numerical values of the to-be-fractured hypotonic gas well along the depth change; and determining the water-producing capacity type of the to-be-fractured hypotonic gas well according to the change form of the natural gamma value curve along with depth and the curve of the logging total hydrocarbon detection numerical values of the to-be-fractured hypotonic gas well along the depth change. The belonged type is determined according to the logging curve of the to-be-fractured position and the logging total hydrocarbon curve, and the fractured water-producing capacity is judged, the judgment is performed according to the most primitive logging information and well logging document, and the accuracy rate is high.
Description
Technical field
The present invention relates to hypotonic gas well fracturing water-yielding capacity and evaluate field, particularly one hypotonic gas well fracturing water-yielding capacity determination methods.
Background technology
Low permeability gas reservoirs is subject to the impact of reservoir properties and filled degree when becoming to hide, water-gas relation is complicated.Cause well log interpretation to be the layer position of gas-bearing formation, after pressure break, there will be product water in various degree.Often occur that in fractured layer position, well log interpretation is gas-bearing formation, but a large amount of water of pressure break rear section well output and a small amount of gas, have a strong impact on the progress of correct understanding to reservoir and evaluation and exploration and development.
Fractured Gas Wells is larger on the impact of production capacity after producing water, is mainly reflected in: after one, gas reservoir produces water, because formation water is scurried into along crack (Thief zone), and segmentation gas reservoir, forms Si Qi district, ultimate recovery is reduced.The ultimate recovery of general pure gas drive gas reservoir can up to 90%, and the average recovery ratio of water drive gas reservoir is only 40% ~ 60%.The reserves of more than 30% are also had can not adopt out due to the separation of the flow domain.Two, after Gas well dewatering, under the effect of capillary force, encroached water is to imbibition in the pore media of both sides, crack on the one hand, reduces gas flow passage in matrix; Under the back pressure that in pit shaft, hydrops produces on the other hand and the effect of microchannel capillary pressure, reverse osmosis suction water-blocking effect is formed near wellbore formation, gas well deliverability is reduced rapidly.Three, gas well reduces the permeability of gas phase after producing water, and in flow event, the pressure loss increases, and gas well output declines rapidly, enters decline period in advance.Four, gas well to produce after water because water is constantly assembled in shaft bottom, causes gas well liquid loading WGR to rise, can to gas well yield and production capacity, and even the Reserves Assessment in whole gas field and the enforcement of development plan have an impact (affecting the correct understanding to reservoir).
Accurate judgement gas well water-yielding capacity, instructs preferred fractured layer position, reduces pressure break risk particularly important.Mainly contain in the mode of water-yielding capacity prediction at present and judge that pressure break water-yielding capacity and the fluid type according to well log interpretation judge pressure break water-yielding capacity according to water saturation.
1) when adopting core experiment well logging irreducible water saturation to judge fractured layer water outlet risk, the irreducible water saturation difference obtained due to different experiments method is large, be difficult to the true Pore structure angle value determining reservoir, as shown in Figure 1, irreducible water saturation correlation corresponding to the different permeabilities obtained is poor.And divide non-homogeneity due to reservoir, be difficult to adopt segment rock core result to characterize the reservoir Pore structure of large section, owing to lacking the well-log information of Fine structural interpretation, cannot accurately judge the moisture of reservoir and gas-bearing property, therefore qualitatively judge poor reliability with this forwarding method.
2) well log interpretation relies on a large amount of rock electricity data, owing to lacking the data of this aspect for prospect pit, cause the variation of well log interpretation conclusion, the explanation results drawn the different explanation personnel of different times has larger difference, even convection cell character judges to there will be large change, the part initial stage is interpreted as gas-bearing formation, the later stage re-recognize after may for air water with layer or water layer.A lot of hypotonic gas well due to reference to well log interpretation achievement, cause the fluid of output after pressure break and intended result quite different.And usually a property parameters is generally explained to large section sandstone when well log interpretation, because Effective Reservoirs governing factor is complicated, gas-bearing property quantitative assessment difficulty is large, prospect pit lacks effective rock electricity data, part gas-bearing formation electrical property feature is not obvious, properties of fluid in bearing stratum determines difficulty, and Well log quantitative explanation is with a low credibility.The layer position large for longitudinal reservoir span, non-homogeneity is strong, because its physical property changes greatly, causes water-gas distribution uneven.Such explanation masks the segment layer that mid portion may produce water, causes and judges inaccurate to gas well fracturing water-yielding capacity.
Current method few, true property of accurate Consideration when qualitatively judging low-permeability fracturing gas well water-yielding capacity is lower, causes before and after pressure break comparatively large to the knowable difference of product, have impact on the accurate understanding to reservoir and evaluation, add pressure break risk.
Summary of the invention
The technical problem to be solved in the present invention is: in hypotonic gas well fracturing water-yielding capacity deterministic process, how to reduce the dependence to core experiment and result of log interpretation, improves the accuracy judging low-permeability fracturing gas well water-yielding capacity.
In order to solve the problems of the technologies described above, the invention provides a kind of hypotonic gas well fracturing water-yielding capacity determination methods, comprising:
Steps A, measurement treat the natural gamma value of the hypotonic gas well different depth of pressure break, and obtain the change curve of described natural gamma value with the degree of depth;
Step B, change shape according to natural gamma value curve, treat the formation water occurrence type of the hypotonic gas well of pressure break described in determining;
Step C, measurement treat that the well logging total hydrocarbon of the hypotonic gas well different depth of pressure break detects numerical value, and obtain the change curve of well logging total hydrocarbon detection numerical value with the degree of depth;
Step D, detect numerical value with the change curve of the degree of depth according to described gamma ray curve with the change shape of the degree of depth and described well logging total hydrocarbon, described in determining, treat the water-yielding capacity type of the hypotonic gas well of pressure break.
Further, also comprise after step D:
According to the water-yielding capacity type treating the hypotonic gas well of pressure break, determine the water-yielding capacity scope of Fractured Gas Wells.
Further, in described steps A, also measure treat pressure break hypotonic gas well different depth with the next item down or multinomial measurement item: the numerical value of numerical value resistivity, compensated neutron, density; Obtain resistivity curve and/or compensated neutron curve and/or density curve;
In described step B, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining;
In described step D, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining.
Further, formation water occurrence type comprises irreducible water, intermediary water, occluded water and Free water;
Wherein, described irreducible water is that the stratum product water caused is grown in reservoir micropore;
Described intermediary water is that water is produced on the stratum that reservoir heterogeneity causes;
Described occluded water is the stratum product water that gas reservoir fills the formation of degree deficiency;
Described Free water is that water is produced on the stratum that tectonic termination or source of the gas deficiency are formed.
Further, water-yielding capacity type comprises weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, owes full gassiness type and single peak gassiness type;
Wherein, described weak gassiness type is because reservoir properties is poor, and when becoming to hide, gas charge pressure is inadequate, and cause the gas flow entering reservoir few, reservoir gas-bearing saturation ratio is low, and water saturation is high; Only can see faint gas during well logging and survey display;
Well logging morphologic appearance is: gas saturation lower than the first saturation ratio threshold value, at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all lower than the first total hydrocarbon threshold value;
Described jagged peaks gassiness type is due to reservoir, and the reservoir gas-bearing property that when causing into Tibetan, thickness is less is good, and all the other position gas-bearing properties are poor, low during height during total hydrocarbon in gas logging display when well logging;
Logging curve morphologic appearance is: the gas-bearing property in same set of sand body is different, in the well logging total hydrocarbon numerical values recited alternately change of described well logging total hydrocarbon numerical value with the change curve of the degree of depth;
Described nearly full gassiness type is because reservoir properties is good, and when becoming to hide, gas charge is abundant, and overall gas-bearing property is good, but occurs that gas-bearing property is slightly poor at some position, and total hydrocarbon in gas logging display reduces, but the total hydrocarbon in gas logging of entirety display amplitude is higher, and tracing pattern is smoothly full;
Logging curve morphologic appearance is: at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all higher than the second total hydrocarbon threshold value, or the impact that described well logging total hydrocarbon numerical value is subject to reservoir properties with the well logging total hydrocarbon numerical value of certain section of the change curve of the degree of depth reduces, but remainder is higher than the second total hydrocarbon threshold value, and the well section thickness of well logging total hydrocarbon numerical value display exception is greater than Sandstone Section thickness;
When described deficient full gassiness type is owing to becoming to hide, source of the gas is inadequate, and by whole for the initial condition in reservoir displacement not out, cause part water movable, the gas-bearing property of reservoir is poor for gas, is therefore level and smooth low value on total hydrocarbon in gas logging realizes;
Logging curve morphologic appearance is: well logging total hydrocarbon numerical value has display at Reservoir Section, and at the bottom of Reservoir Section top, well logging total hydrocarbon numerical value is less than the 3rd total hydrocarbon threshold value; At middle part well logging total hydrocarbon numerical value higher than the 4th total hydrocarbon threshold value;
Described single peak gassiness type is because the good part thickness of reservoir properties is little, and when becoming to hide, gas preferentially enters this layer; But be subject to oil accumulation factor impact, all the other Reservoir Sections are completely not filled by gas, and therefore gas-bearing property is poor; Total hydrocarbon in gas logging is only higher in the part that physical property is good, and all the other positions are 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, significantly raises, occur the peak value of at the well logging total hydrocarbon numerical value of certain section of described well logging total hydrocarbon numerical value with the change curve of the degree of depth.
Further, determine in step B described in treat that the step of the formation water occurrence type of the hypotonic gas well of pressure break comprises:
B1, the change shape of the change shape of described gamma ray curve and described resistivity curve and/or the change shape of described compensated neutron curve and/or the change shape of described density curve to be compared one by one with the indicatrix in water-yielding capacity recognition template;
B2, to determine and the change shape of the change shape of described gamma ray curve and described resistivity curve and/or the change shape of described compensated neutron curve and/or the immediate stack features curve of the change shape of described density curve, using formation water occurrence type corresponding for described indicatrix as the described formation water occurrence type treating the hypotonic gas well of pressure break.
Further, determine in step D described in treat that the step of the water-yielding capacity type of the hypotonic gas well of pressure break comprises:
The gamma ray curve of fractured layer position is treated in D1, contrast, determines that analyzing well section belongs to Sandstone Section, with well logging total hydrocarbon, described well logging gas logging total hydrocarbon curve numerical value is judged that the indicatrix in pressure break water-yielding capacity recognition template compares one by one with the change curve of the degree of depth;
D2, determine to judge an immediate stack features curve in pressure break water-yielding capacity recognition template, using water-yielding capacity type corresponding for described indicatrix as the described water-yielding capacity type treating the hypotonic gas well of pressure break with described well logging total gas curve with the variation characteristic of the degree of depth and well logging total hydrocarbon.
Further, the step obtaining described water-yielding capacity recognition template comprises:
Collect hypotonic gas well fracturing tested productivity information, the statistics fracturing section gamma ray curve of often planting formation water occurrence type with the variation characteristic of the degree of depth and described resistivity curve with the variation characteristic of the degree of depth and/or described compensated neutron curve with the variation characteristic of the degree of depth and/or the described density curve variation characteristic with the degree of depth;
According to statistical information, set up described gamma ray curve and described resistivity curve and/or described compensated neutron curve and/or the variation characteristic of described density curve with the degree of depth and the corresponding relation of formation water occurrence type;
Treat described in determining in step B that the step of the formation water occurrence type of the hypotonic gas well of pressure break comprises:
According to described position for the treatment of the change shape determination Sandstone Section of the gamma ray curve of fractured layer position;
Change shape according to resistivity curve and compensated neutron curve tentatively determines stratum aquatic products shape type;
When the change shape of resistivity curve or compensated neutron curve only has one to conform to described water-yielding capacity recognition template, change shape in conjunction with density curve judges, when density value is as the criterion lower than the formation water occurrence type determined with resistivity curve during the first density threshold, the formation water occurrence type determined with compensated neutron curve higher than the first density threshold when density value is as the criterion.
Further, the step obtaining described pressure break water-yielding capacity recognition template comprises:
Collect hypotonic gas well fracturing tested productivity information and well logging total hydrocarbon in gas logging information, statistics fracturing section often plants the variation characteristic of well logging total hydrocarbon value with the degree of depth of water-yielding capacity type;
According to statistical information, set up the variation characteristic of described well logging total hydrocarbon in gas logging numerical value with the degree of depth and the corresponding relation of water-yielding capacity type.
Further, the first saturation ratio threshold value and the first total hydrocarbon threshold value are 5%.
Compared with prior art, the determination methods that the present invention proposes, according to treating that the natural gamma of log of fractured layer position, 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, rely on the most original well-log information and log data to judge, accuracy rate is high.
Accompanying drawing explanation
Fig. 1 is the irreducible water saturation that obtains of different tests method that the present invention proposes and permeability schematic diagram;
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 well fracturing section well logging complex chart of the embodiment of the present invention;
Fig. 4 is the first hypotonic gas well H1 well Logging curve variation diagram of the embodiment of the present invention;
Fig. 5 is the second hypotonic gas well H2 borehole logging tool resultant curve variation diagram of the embodiment of the present invention;
Fig. 6 is the second hypotonic gas well H2 well well logging total hydrocarbon change curve of the embodiment of the present invention;
Fig. 7 is the 3rd hypotonic gas well H3 well well logging total gas curve variation diagram of the embodiment of the present invention;
Fig. 8 is the 4th hypotonic gas well H4 well 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 chart of the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
As shown in Figure 2, the embodiment of the present invention provides a kind of hypotonic gas well fracturing water-yielding capacity determination methods, comprising:
Steps A, measurement treat the natural gamma value of the hypotonic gas well different depth of pressure break, and obtain the change curve of described natural gamma value with the degree of depth;
Step B, change shape according to natural gamma value curve, treat the formation water occurrence type of the hypotonic gas well of pressure break described in determining;
Step C, measurement treat that the well logging total hydrocarbon of the hypotonic gas well different depth of pressure break detects numerical value, and obtain the change curve of well logging total hydrocarbon detection numerical value with the degree of depth;
Step D, detect numerical value with the change curve of the degree of depth according to described gamma ray curve with the change shape of the degree of depth and described well logging total hydrocarbon, described in determining, treat the water-yielding capacity type of the hypotonic gas well of pressure break.
Wherein gamma ray curve numerical value is for judging whether Reservoir Section belongs to sandstone reservoir, and Main Basis well logging total hydrocarbon detection numerical value carries out with the change shape of the change curve of the degree of depth identification that well logging judges formation water occurrence.
Wherein, in actual applications steps A, B and step C, D have no time on sequencing.
Research according to the well logging and technological parameter that affect gas well fracturing production capacity shows, test section resistivity is the most remarkable on the impact of gas production, as shown in table 1, the parameter that secondly can reflect on log is gamma ray curve, is GR, DEN, AC, CNL, SH afterwards successively.Therefore, in qualitative analysis to Fractured Gas Wells aquifer yield, analyze resistivity curve, gamma ray curve, compensated neutron curve, (impact that AC curve is subject to borehole wall stability is larger for density curve, the difficulty that its value accurately obtains is large, therefore DEN curve is adopted to characterize reservoir properties), the curvilinear motion feature that Different Strata aquatic products shape is corresponding 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 comprise after step D:
According to the water-yielding capacity type treating the hypotonic gas well of pressure break, determine the water-yielding capacity scope of Fractured Gas Wells.
Further, in described steps A, also measure treat pressure break hypotonic gas well different depth with the next item down or multinomial measurement item: the numerical value of numerical value resistivity, compensated neutron, density; Obtain resistivity curve and/or compensated neutron curve and/or density curve;
In described step B, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining;
In described step D, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining.
Wherein, when formation water can not flow in reservoir during production, be called irreducible water, grow the stratum of causing for reservoir micropore and produce water;
Moveable water between sandstone is called intermediary water, and water is produced on the stratum of causing for reservoir heterogeneity;
When becoming to hide, the water in sandstone is not discharged by hydrocarbon gas completely, causes that gas reservoir water saturation is high is called occluded water, produces water for gas reservoir fills the stratum that degree deficiency formed;
Only at certain a bit of gassiness in sandstone, remainder gas-bearing property difference causes formation water to be completely movably called Free water, and water is produced on the stratum formed for tectonic termination or source of the gas deficiency.
Wherein, water-yielding capacity type comprises weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, owes full gassiness type and single peak gassiness type;
Described weak gassiness type is because reservoir properties is poor, and when becoming to hide, gas charge pressure is inadequate, and cause the gas flow entering reservoir few, reservoir gas-bearing saturation ratio is low, and water saturation is high; Only can see faint gas during well logging and survey display;
Well logging morphologic appearance is: gas saturation lower than the first saturation ratio threshold value, at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all lower than the first total hydrocarbon threshold value;
Described jagged peaks gassiness type is due to reservoir, and the reservoir gas-bearing property that when causing into Tibetan, thickness is less is good, and all the other position gas-bearing properties are poor, low during height during total hydrocarbon in gas logging display when well logging;
Logging curve morphologic appearance is: the gas-bearing property in same set of sand body is different, in the well logging total hydrocarbon numerical values recited alternately change of described well logging total hydrocarbon numerical value with the change curve of the degree of depth;
Described nearly full gassiness type is because reservoir properties is good, and when becoming to hide, gas charge is abundant, and overall gas-bearing property is good, but occurs that gas-bearing property is slightly poor at some position, and total hydrocarbon in gas logging display reduces, but the total hydrocarbon in gas logging of entirety display amplitude is higher, and tracing pattern is smoothly full;
Logging curve morphologic appearance is: at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all higher than the second total hydrocarbon threshold value, or the impact that described well logging total hydrocarbon numerical value is subject to reservoir properties with the well logging total hydrocarbon numerical value of certain section of the change curve of the degree of depth reduces, but remainder is higher than the second total hydrocarbon threshold value, and the well section thickness of well logging total hydrocarbon numerical value display exception is greater than Sandstone Section thickness;
When described deficient full gassiness type is owing to becoming to hide, source of the gas is inadequate, and by whole for the initial condition in reservoir displacement not out, cause part water movable, the gas-bearing property of reservoir is poor for gas, is therefore level and smooth low value on total hydrocarbon in gas logging realizes;
Logging curve morphologic appearance is: well logging total hydrocarbon numerical value has display at Reservoir Section, and at the bottom of Reservoir Section top, well logging total hydrocarbon numerical value is less than the 3rd total hydrocarbon threshold value; At middle part well logging total hydrocarbon numerical value higher than the 4th total hydrocarbon threshold value;
Described single peak gassiness type is because the good part thickness of reservoir properties is little, and when becoming to hide, gas preferentially enters this layer; But be subject to other oil accumulation factor impact (as how many in filled pressure, source of the gas), all the other Reservoir Sections are completely not filled by gas, and therefore gas-bearing property is poor; Total hydrocarbon in gas logging is only higher in the part that physical property is good, and all the other positions are 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, significantly raises, occur the peak value of at the well logging total hydrocarbon numerical value of certain section of described well logging total hydrocarbon numerical value with the change curve of the degree of depth.
Treat described in determining in step B that the step of the formation water occurrence type of the hypotonic gas well of pressure break comprises:
B1, the numerical value of described gamma ray curve to be compared with the indicatrix in water-yielding capacity recognition template with the change curve of the degree of depth with the change curve of the degree of depth, described density with the change curve of the degree of depth, described compensated neutron one by one with the change curve of the degree of depth, described resistivity;
B2, determine with described gamma ray curve, described resistivity curve, described compensated neutron curve, described density curve with the immediate stack features curve of change curve of the degree of depth, using formation water occurrence type corresponding for described indicatrix as the described formation water occurrence type treating the hypotonic gas well of pressure break.
The step obtaining described water mixing capability identification template comprises:
Collect hypotonic gas well fracturing tested productivity information, statistics fracturing section often plant the variation characteristic of gamma ray curve with the degree of depth of formation water occurrence type, described resistivity curve with the variation characteristic of the degree of depth, described compensated neutron curve with the variation characteristic of the degree of depth, described density curve with the variation characteristic of the degree of depth.
According to statistical information, set up described gamma ray curve, described resistivity curve, described compensated neutron curve, the variation characteristic of described density curve with the degree of depth and the corresponding relation of formation water occurrence type.
During recognition template, according to described position for the treatment of the change shape determination Sandstone Section of the gamma ray curve of fractured layer position;
When the change shape of resistivity curve or compensated neutron curve only has one to conform to described water-yielding capacity recognition template, change shape in conjunction with density curve judges, when density value is as the criterion lower than the formation water occurrence type determined with resistivity curve during the first density threshold, the formation water occurrence type determined with compensated neutron curve higher than the first density threshold when density value is as the criterion.
The occurrence of formation water in reservoir pore, the absorption mainly by pore size, venturi and rock particles surface controlled.According to genetic model and the formation water occurrence status of moisture gas-bearing formation, formation water occurrence is divided into four classes by calmodulin binding domain CaM structure, RESERVOIR PORE STRUCTURE and heterogeneous body situation, the Free water that namely intermediary water that the irreducible water, the reservoir heterogeneity that cause cause is grown in reservoir micropore, gas reservoir fills the not enough formation of occluded water, tectonic termination or source of the gas that degree deficiency is formed.
By the tested productivity situation summary to fractured well in early stage, in conjunction with the resistivity of fracturing section and the variation characteristic of gamma ray curve, the Variation Features summing up various formation water occurrence corresponding is as shown in table 2:
(1) irreducible water: gamma ray curve is level and smooth low value, and the two ends of resistivity curve smoothly uprise to centre, compensated neutron is level and smooth low value (negative anomaly) at Reservoir Section.
(2) intermediary water: gamma ray curve entirety is low value, there is high level in local, shows the feature that shale content increases.Resistivity curve presents the change of obvious rhythm formula height.Compensated neutron curve is on the whole based on negative anomaly, and rising and falling appears in local well section.
(3) occluded water: gamma ray curve is level and smooth low value, and on resistivity curve, height bends down.Compensated neutron curve is obvious at the well section negative anomaly that resistivity is high, and its value of well section that resistivity is low increases.
(4) Free water: gamma ray curve is level and smooth low value, there is increase among a small circle in resistivity, remainder is low value.Compensated neutron is only a bit of at top there is negative anomaly, and bottom is low value.
Table 2 log sets up water-yielding capacity recognition template
Change when practical application first according to natural gamma and resistivity curve form identifies the formation water occurrence type belonging to it, and then judges its aerogenesis and water-yielding capacity qualitatively.
Treat described in determining in step D that the step of the water-yielding capacity type of the hypotonic gas well of pressure break comprises:
The gamma ray curve of fractured layer position is treated in D1, contrast, determines that analyzing well section belongs to Sandstone Section, with well logging total hydrocarbon, described well logging gas logging total hydrocarbon curve numerical value is judged that the indicatrix in pressure break water-yielding capacity recognition template compares one by one with the change curve of the degree of depth;
D2, determine to judge an immediate stack features curve in pressure break water-yielding capacity recognition template, using water-yielding capacity type corresponding for described indicatrix as the described water-yielding capacity type treating the hypotonic gas well of pressure break with described well logging total gas curve with the variation characteristic of the degree of depth and well logging total hydrocarbon.
The step obtaining described water-yielding capacity recognition template comprises:
Collect hypotonic gas well fracturing tested productivity information, the statistics fracturing section gamma ray curve of often planting formation water occurrence type with the variation characteristic of the degree of depth and described resistivity curve with the variation characteristic of the degree of depth and/or described compensated neutron curve with the variation characteristic of the degree of depth and/or the described density curve variation characteristic with the degree of depth;
According to statistical information, set up described gamma ray curve and described resistivity curve and/or described compensated neutron curve and/or the variation characteristic of described density curve with the degree of depth and the corresponding relation of formation water occurrence type.
Gas detection logging is by analyzing the component and the content thereof that enter the fuel gas in drilling fluid in drilling process, analyze the oil-gas Layer determining whether industrial value, that is by analyzing the content of gas in drilling fluid, the oil in stratum, the content of natural gas and composition thereof can directly be measured.The research that current utilization well logging Gas logging data carries out fluid identification of reservoir is more, and effect is better.Mainly because Gas logging data during well logging can accurately and really reflect reservoir properties and gas-bearing property.Therefore adopt total hydrocarbon in gas logging data to carry out gas well fracturing capability forecasting and there is theoretical foundation.
According to the relation that production capacity and the well logging total hydrocarbon (Tg) of the hypotonic gas well fracturing of reality change, sum up recognition template.Different Changing Patterns according to gamma ray curve and well logging total gas curve are divided into five types, respectively: weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, deficient full gassiness type, single peak gassiness type, the Variation Features summing up various stratum water-yielding capacity type corresponding is as shown in table 3:
1) weak gassiness type: natural gamma shows as sandstone features, and Tg value is very low, or gas does not survey display.
2) jagged peak gassiness type: little zigzag change appears in gamma ray curve curve, and the peak value of multiple segment appears in Tg, and all the other sections are low value.
3) nearly full gassiness type: little high level appears in gamma ray curve local, but shows level and smooth low value generally.Tg curve is full double-peak shape, shows gas deliverability stronger.
4) full gassiness type is owed: gamma ray curve is level and smooth low value, and Tg curve is low on Sandstone Section top, and bottom also reduces to 0 gradually, the middle peak value without exceeding many times.
5) single peak gassiness type: natural gamma is low value, belongs to typical sandstone features.There is the peak value of segment on the top of sand body in Tg, shows extremely low value at remainder, presents deficient full form generally.
The hypotonic gas well fracturing water-yielding capacity template that table 3 Logging curve is set up
Natural gamma, resistivity, compensated neutron, density four kinds of log change shapes are adopted to identify affiliated well logging and judge formation water occurrence type by treating fractured layer position, and judge formation water occurrence type by the well logging that contrast well logging total gas curve identifies, two kinds of templates all can draw the water-yielding capacity of a pressure break, choose the upper limit of the upper limit as water-yielding capacity of two kinds of results, the lower limit in two kinds of templates is as the pressure break water-yielding capacity lower limit of this layer.The pressure break water-yielding capacity difference that judges respectively of these two kinds of methods is not too large in theory, if when occurring conflicting, may be because Logging curve receives the interference of non-reservoir factor, should judge that formation water occurrence type is as the criterion with well logging.
Embodiment of the present invention tool has the following advantages:
Parameter required when the method that the embodiment of the present invention adopts judges Fractured Gas Wells water-yielding capacity is few; Can the water-yielding capacity of qualitative forecasting low-permeability fracturing gas well accurately; Do not need the various reservoir physical parameter of artificial explanation and the physical parameter of core experiment, the prospect pit that the data that is more suitable for is few and evaluation well; Pressure break well and story selecting can be instructed, evade pressure break risk, improve the efficient of fracturing technology.
Embodiment one
The present embodiment illustrates for marine first low permeability gas field H1 well the determination methods that the embodiment of the present invention provides.
Step 1: collect well logging (.las form) and the logging data for the treatment of the hypotonic gas well of pressure break, and draw natural gamma, resistivity (logarithmic scale), compensated neutron, the variable density of different depth;
Step 2: analyze and treat that the log in the natural gamma of fracturing section, resistivity, compensated neutron, density curve variation characteristic and the present invention sets up the comparison of water-yielding capacity recognition template, find out its formation water occurrence type;
Step 3: set up the rear production capacity situation of pressure in water-yielding capacity recognition template at log, determine the result qualitatively judged according to log qualitatively;
Step 4: draw natural gamma and the well logging total hydrocarbon value curve (well logging total hydrocarbon value adopts logarithmic scale) with change in depth.
Step 5: the hypotonic gas well fracturing water-yielding capacity Template Controls fractured interval natural gamma set up according to Logging curve and the curvilinear motion form of well logging total hydrocarbon (Tg), finds out the type belonging to it;
Step 6: the total hydrocarbon type judged according to Logging curve, describes it qualitatively and produces water and gas deliverability.
Step 7: the result qualitatively judged in conjunction with log and Logging curve, gets aquifer yield value as the upper limit (judging at the not full-time wherein a kind of recognition template that also can adopt of data)
Above method has considered the relation of water-yielding capacity after reservoir formation aquatic products shape (log), gas-bearing property (well logging total gas curve) and pressure break, can draw the product water risk after gas well fracturing comparatively accurately.Overcome the dependence of common method to reservoir physical parameter and core experiment, accuracy has had and has significantly improved.
First low permeability gas field H1 fracturing section is 4173-4186.5m.The reservoir permeability of well log interpretation is 2.9md, and degree of porosity is 10.1%, and water saturation is 39.8%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long is 81m.Adopt numerical Simulation Prediction productivity of fractured to be 9 × 104m3/d, produce water 15m3/d.After actual pressure break, daily gas 1.5 × 104m3/d, does not produce water.
Adopt the log in the present invention to set up water-yielding capacity recognition template, judge that this fracturing section is irreducible water occurrence (Fig. 3), after qualitatively judging its pressure break, aerogenesis is lower than 2 × 104m3/d, produces water lower than 5m3/d.Little with actual test result difference.
The hypotonic gas well fracturing water-yielding capacity template adopting Logging curve to set up judges that this layer is jagged peak gassiness type (Fig. 4), belongs to nearly full gassiness type, and daily gas, lower than 5 × 104m3/d, produces water lower than 5m3/d, close with test result.
Therefore, the method for the embodiment of the present invention is adopted can to judge water-yielding capacity after the pressure break of this well accurately.
Embodiment two
For marine second low permeability gas field H2 well, fracturing section is 3949.0-3979.9m.The reservoir permeability of well log interpretation is 1.6md, and degree of porosity is 10.2%, and water saturation is 43.8%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long is 140m.Numerical Simulation Prediction productivity of fractured is adopted to be 8.2 × 10
4m
3/ d, produces water 10m
3/ d.Daily gas 0.16 × 10 after actual pressure break
4m
3/ d, produces water 60.1m
3/ d.
Adopt the log in the present invention to set up water-yielding capacity recognition template, judge that this fracturing section is occluded water occurrence (Fig. 5), after qualitatively judging its pressure break, aerogenesis is lower than 2 × 10
4m
3/ d, produces water and is greater than 20m
3/ d.Conform to test result.
The hypotonic gas well fracturing water-yielding capacity template adopting Logging curve to set up judges that this layer is as belonging to deficient full gassiness type (Fig. 6), and daily gas is lower than 1 × 10
4m
3/ d, produces water higher than 40m
3/ d is close with test result.
Therefore, the method for the embodiment of the present invention is adopted can to judge water-yielding capacity after the pressure break of this well accurately.
Embodiment three
For land the 3rd low permeability gas field H3 well, fracturing section is 3230-3270m.The reservoir permeability of well log interpretation is 1.02 × 10
-3μm
2, degree of porosity is 13.35%, and water saturation is 46%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long is 120m.Numerical Simulation Prediction productivity of fractured is adopted to be 6 × 10
4m
3/ d, produces water 20m
3/ d.Daily gas 2.04 × 10 after actual pressure break
4m
3/ d, produces water 1.8m
3/ d.
The hypotonic gas well fracturing water-yielding capacity template adopting Logging curve to set up judges that this layer is as belonging to jagged peak gassiness type (Fig. 7), and daily gas is lower than 2-5 × 10
4m
3/ d, produces water lower than 5m
3/ d is close with test result.
Embodiment four
For land the 4th low permeability gas field H4 well, fracturing section is 3520-3560m.The reservoir permeability of well log interpretation is 0.82 × 10
-3μm
2, degree of porosity is 11.5%, and water saturation is 39%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long is 90m.Numerical Simulation Prediction productivity of fractured is adopted to be 4 × 10
4m
3/ d, produces water 16m
3/ d.Daily gas 0 × 10 after actual pressure break
4m
3/ d, produces water 7.75m
3/ d.
The hypotonic gas well fracturing water-yielding capacity template adopting Logging curve to set up judges that this layer is weak gassiness type (Fig. 8), and not aerogenesis substantially after pressure break, produces water lower than 5-10m
3/ d is close with test result.
Embodiment five
For marine 5th low permeability gas field N1 well, fracturing section is 4231-4244m.The reservoir permeability of well log interpretation is 3.2md, and degree of porosity is 11.3%, and water saturation is 57%, and well log interpretation conclusion is gas-bearing formation.Fracturing fracture half is long is 142m.Adopt numerical Simulation Prediction productivity of fractured 9 × 10
4m
3/ d, produces water 25m
3/ d.Daily gas 0 × 10 after actual pressure break
4m
3/ d, produces water 87.8m
3/ d.
Adopt the log in the present invention to set up water-yielding capacity recognition template, judge that this fracturing section is Free water occurrence (Fig. 9), to qualitatively judge after its pressure break not aerogenesis substantially, produce water and be greater than 40m
3/ d.Conform to test result.Pressure break is carried out, to reduce pressure break risk according to the reservoir selecting this formation water occurrence of avoiding that this plate can be tried one's best.
Above embodiment only in order to technical scheme of the present invention and unrestricted to be described, only with reference to preferred embodiment to invention has been detailed description.Those of ordinary skill in the art should be appreciated that and can modify to technical scheme of the present invention or equivalent replacement, and does not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1. a hypotonic gas well fracturing water-yielding capacity determination methods, comprising:
Steps A, measurement treat the natural gamma value of the hypotonic gas well different depth of pressure break, and obtain the change curve of described natural gamma value with the degree of depth;
Step B, change shape according to natural gamma value curve, treat the formation water occurrence type of the hypotonic gas well of pressure break described in determining;
Step C, measurement treat that the well logging total hydrocarbon of the hypotonic gas well different depth of pressure break detects numerical value, and obtain the change curve of well logging total hydrocarbon detection numerical value with the degree of depth;
Step D, detect numerical value with the change curve of the degree of depth according to described gamma ray curve with the change shape of the degree of depth and described well logging total hydrocarbon, described in determining, treat the water-yielding capacity type of the hypotonic gas well of pressure break.
2. determination methods as claimed in claim 1, is characterized in that: also comprise after step D:
According to the water-yielding capacity type treating the hypotonic gas well of pressure break, determine the water-yielding capacity scope of Fractured Gas Wells.
3. determination methods as claimed in claim 1 or 2, is characterized in that:
In described steps A, also measure treat pressure break hypotonic gas well different depth with the next item down or multinomial measurement item: the numerical value of numerical value resistivity, compensated neutron, density; Obtain resistivity curve and/or compensated neutron curve and/or density curve;
In described step B, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining;
In described step D, also comprehensive described resistivity curve and/or compensated neutron curve and/or density curve are with the change shape of the degree of depth, treat the water-yielding capacity type of the hypotonic gas well of pressure break described in determining.
4. determination methods as claimed in claim 1 or 2, is characterized in that: formation water occurrence type comprises irreducible water, intermediary water, occluded water and Free water;
Wherein, described irreducible water is that the stratum product water caused is grown in reservoir micropore;
Described intermediary water is that water is produced on the stratum that reservoir heterogeneity causes;
Described occluded water is the stratum product water that gas reservoir fills the formation of degree deficiency;
Described Free water is that water is produced on the stratum that tectonic termination or source of the gas deficiency are formed.
5. determination methods as claimed in claim 1 or 2, is characterized in that: water-yielding capacity type comprises weak gassiness type, jagged peaks gassiness type, nearly full gassiness type, owes full gassiness type and single peak gassiness type;
Wherein, described weak gassiness type is because reservoir properties is poor, and when becoming to hide, gas charge pressure is inadequate, and cause the gas flow entering reservoir few, reservoir gas-bearing saturation ratio is low, and water saturation is high; Only can see faint gas during well logging and survey display;
Well logging morphologic appearance is: gas saturation lower than the first saturation ratio threshold value, at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all lower than the first total hydrocarbon threshold value;
Described jagged peaks gassiness type is due to reservoir, and the reservoir gas-bearing property that when causing into Tibetan, thickness is less is good, and all the other position gas-bearing properties are poor, low during height during total hydrocarbon in gas logging display when well logging;
Logging curve morphologic appearance is: the gas-bearing property in same set of sand body is different, in the well logging total hydrocarbon numerical values recited alternately change of described well logging total hydrocarbon numerical value with the change curve of the degree of depth;
Described nearly full gassiness type is because reservoir properties is good, and when becoming to hide, gas charge is abundant, and overall gas-bearing property is good, but occurs that gas-bearing property is slightly poor at some position, and total hydrocarbon in gas logging display reduces, but the total hydrocarbon in gas logging of entirety display amplitude is higher, and tracing pattern is smoothly full;
Logging curve morphologic appearance is: at described well logging total hydrocarbon numerical value with the well logging total hydrocarbon numerical value of the change curve of the degree of depth all higher than the second total hydrocarbon threshold value, or the impact that described well logging total hydrocarbon numerical value is subject to reservoir properties with the well logging total hydrocarbon numerical value of certain section of the change curve of the degree of depth reduces, but remainder is higher than the second total hydrocarbon threshold value, and the well section thickness of well logging total hydrocarbon numerical value display exception is greater than Sandstone Section thickness;
When described deficient full gassiness type is owing to becoming to hide, source of the gas is inadequate, and by whole for the initial condition in reservoir displacement not out, cause part water movable, the gas-bearing property of reservoir is poor for gas, is therefore level and smooth low value on total hydrocarbon in gas logging realizes;
Logging curve morphologic appearance is: well logging total hydrocarbon numerical value has display at Reservoir Section, and at the bottom of Reservoir Section top, well logging total hydrocarbon numerical value is less than the 3rd total hydrocarbon threshold value; At middle part well logging total hydrocarbon numerical value higher than the 4th total hydrocarbon threshold value;
Described single peak gassiness type is because the good part thickness of reservoir properties is little, and when becoming to hide, gas preferentially enters this layer; But be subject to oil accumulation factor impact, all the other Reservoir Sections are completely not filled by gas, and therefore gas-bearing property is poor; Total hydrocarbon in gas logging is only higher in the part that physical property is good, and all the other positions are 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, significantly raises, occur the peak value of at the well logging total hydrocarbon numerical value of certain section of described well logging total hydrocarbon numerical value with the change curve of the degree of depth.
6. determination methods as claimed in claim 3, is characterized in that: treat described in determining in step B that the step of the formation water occurrence type of the hypotonic gas well of pressure break comprises:
B1, the change shape of the change shape of described gamma ray curve and described resistivity curve and/or the change shape of described compensated neutron curve and/or the change shape of described density curve to be compared one by one with the indicatrix in water-yielding capacity recognition template;
B2, to determine and the change shape of the change shape of described gamma ray curve and described resistivity curve and/or the change shape of described compensated neutron curve and/or the immediate stack features curve of the change shape of described density curve, using formation water occurrence type corresponding for described indicatrix as the described formation water occurrence type treating the hypotonic gas well of pressure break.
7. determination methods as claimed in claim 1 or 2, is characterized in that: treat described in determining in step D that the step of the water-yielding capacity type of the hypotonic gas well of pressure break comprises:
The gamma ray curve of fractured layer position is treated in D1, contrast, determines that analyzing well section belongs to Sandstone Section, with well logging total hydrocarbon, described well logging gas logging total hydrocarbon curve numerical value is judged that the indicatrix in pressure break water-yielding capacity recognition template compares one by one with the change curve of the degree of depth;
D2, determine to judge an immediate stack features curve in pressure break water-yielding capacity recognition template, using water-yielding capacity type corresponding for described indicatrix as the described water-yielding capacity type treating the hypotonic gas well of pressure break with described well logging total gas curve with the variation characteristic of the degree of depth and well logging total hydrocarbon.
8. determination methods as claimed in claim 6, is characterized in that: the step obtaining described water-yielding capacity recognition template comprises:
Collect hypotonic gas well fracturing tested productivity information, the statistics fracturing section gamma ray curve of often planting formation water occurrence type with the variation characteristic of the degree of depth and described resistivity curve with the variation characteristic of the degree of depth and/or described compensated neutron curve with the variation characteristic of the degree of depth and/or the described density curve variation characteristic with the degree of depth;
According to statistical information, set up described gamma ray curve and described resistivity curve and/or described compensated neutron curve and/or the variation characteristic of described density curve with the degree of depth and the corresponding relation of formation water occurrence type;
Treat described in determining in step B that the step of the formation water occurrence type of the hypotonic gas well of pressure break comprises:
According to described position for the treatment of the change shape determination Sandstone Section of the gamma ray curve of fractured layer position;
Change shape according to resistivity curve and compensated neutron curve tentatively determines stratum aquatic products shape type;
When the change shape of resistivity curve or compensated neutron curve only has one to conform to described water-yielding capacity recognition template, change shape in conjunction with density curve judges, when density value is as the criterion lower than the formation water occurrence type determined with resistivity curve during the first density threshold, the formation water occurrence type determined with compensated neutron curve higher than the first density threshold when density value is as the criterion.
9. determination methods as claimed in claim 7, is characterized in that: the step obtaining described pressure break water-yielding capacity recognition template comprises:
Collect hypotonic gas well fracturing tested productivity information and well logging total hydrocarbon in gas logging information, statistics fracturing section often plants the variation characteristic of well logging total hydrocarbon value with the degree of depth of water-yielding capacity type;
According to statistical information, set up the variation characteristic of described well logging total hydrocarbon in gas logging numerical value with the degree of depth and the corresponding relation of water-yielding capacity type.
10. determination methods as claimed in claim 5, is characterized in that: the first saturation ratio threshold value and the first total hydrocarbon threshold value are 5%.
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