CN103902827A - Flow unit division method of carbonate-rock horizontal wells - Google Patents
Flow unit division method of carbonate-rock horizontal wells Download PDFInfo
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Abstract
The invention discloses a flow unit division method of carbonate-rock horizontal wells. The flow unit division method includes the steps of judgment of communicating relation among the wells; determination of an oil drainage area; recognition of reservoir body characteristics and establishment and verification of numerical well testing models. The flow unit division method is of great importance to production development and management and subsequent potential tapping of a well mine. Development of well drilling can be ensured not to employ untouched flow units aiming at complex geological features of anisotropy and the like of carbonate reservoirs, a great deal of funds can be saved, and economic effectiveness can be improved. By the flow unit division method, the flow units can be accurately divided, and the great importance to the production development and management and subsequent potential tapping of the well mine can be achieved.
Description
Technical field
The invention belongs to carbonate rock hydrocarbon reservoir development technique field, relate in particular to a kind of carbonatite horizontal well flow unit division methods.
Background technology
Flow unit is to have identical seepage flow characteristics, can be used as aborning the reservoir units of a relatively independent exploitation, the well that is positioned at same flow moving cell has identical the sedimentary age and sedimentary environment, relatively consistent pressure breakdown or pressure trend, and there is same or analogous production variation characteristic, and in Development and Production, there is interference phenomenon between well.Therefore, accurately division of flow units, specifies flow unit and is controlled by individual well or is communicated with well group and be of great significance for production development management and the later stage tool of taping the latent power.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of carbonatite horizontal well flow unit division methods, is intended to tap the latent power guidance is provided for the production development management of Jing Kuang and later stage.
The embodiment of the present invention is achieved in that a kind of carbonatite horizontal well flow unit division methods, and this carbonatite horizontal well flow unit division methods comprises the following steps:
Step 1, select adjacent Liang Koujing, the judgement of interwell communication relation;
Step 2, in horizontal well, be lowered to pressure gauge, gaging pressure recovers data; Obtain after pressure recovery data, adopt responding curve of well well-logging method, choose with single horizontal well or be communicated with the construction location of well group, the boundary model calculating drainage area that reservoir distribution scope conforms to;
Step 3, in conjunction with Seismic reflection character and reservoir distribution scope, in drainage area, determine the particular location of single or multiple Reservoir Bodies; According to single horizontal well or connection well group different times PVT sampling data and oil gas aquation certification of registered capital material, the character of analyzing oil and gas water or other fluid situation over time, determines the fluid properties of each Reservoir Body;
Step 4, select in second step pressure to recover data, use numerical well testing module in Saphir software, set up following single horizontal well or be communicated with the numerical well testing model of well group; Adopt PEBI grid and numerical technology, the numerical value of each Reservoir Body mobility ratio and dispersion ratio in debugging drainage area, until pressure matched curve and the measured curve similarity of the numerical well testing model of building are high, related coefficient reaches designing requirement, the permeability magnitude of each region interpretation meets geologic feature, judges that the flow unit boundary demarcation of single horizontal well or connection well group is reasonable; Otherwise pressure matched curve and the measured curve similarity of the numerical well testing model of building are low, related coefficient does not reach designing requirement, need again to carry out the work, until the pressure matched curve of the numerical well testing model of building and the related coefficient of measured curve reach designing requirement.
Further, in step 1, the method for interwell communication relation judgement comprises two kinds of methods:
Method one, does interference test test and judges the connectedness between adjacent well, and in interference test test, perturbed well sends exciting signal, if monitor at inspection well the signal that perturbed well sends, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with; Method two, does tracer test and judges the connectedness between adjacent well, adds tracer agent in water injection well, if detect the tracer agent adding in inspection well, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with.
Further, if judge that two mouthfuls of wells are disconnected, divide single horizontal well flow unit border, otherwise divide the flow unit border that is communicated with well group.
Further, in step 3, determine the Reservoir Body number of single horizontal well or the control of connection well group; By the production run of the single horizontal well of Real-Time Monitoring or connection well group, analyzing oil and gas production decline law in time, if oil gas production decline law is in time two exponential tapers, judge and have multiple Reservoir Bodies to participate in feed flow, successively decrease if oil gas production decline law is in time single index, judgement is that single Reservoir Body participates in feed flow.
Further, in step 4, numerical well testing model comprises: load the omnidistance pressure of each well, yield data, using middle drainage area as peripheral boundary, each Reservoir Body is as seepage flow variation zone independently in drainage area, and gives assignment with the weighted mean value of thickness in work area and factor of porosity.
Carbonatite horizontal well flow unit division methods provided by the invention, adopts the judgement of interwell communication relation; Drainage area is determined; Reservoir Body feature understanding; Numerical well testing model is set up and checking; Accurately division of flow units, is of great significance for the production development management of Jing Kuang and the later stage tool of taping the latent power.The present invention can be for complicated geological features such as carbonate reservoir nonuniformity, guarantees that exploitation well bores chance and do not employ flow unit, can save substantial contribution, increases economic efficiency.
Accompanying drawing explanation
Fig. 1 is the carbonatite horizontal well flow unit division methods process flow diagram that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the carbonatite horizontal well flow unit division methods of the embodiment of the present invention comprises the following steps:
S101: interwell communication relation judgement;
S102: drainage area is determined;
S103: Reservoir Body feature understanding;
S104: numerical well testing model is set up and checking.
Concrete steps of the present invention are:
The first step, judges the connectedness between adjacent well; Concrete grammar is:
Choose adjacent Liang Koujing;
Method one, does interference test test and judges the connectedness between adjacent well.In interference test test, perturbed well sends exciting signal, if monitor at inspection well the signal that perturbed well sends, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with; Method two, does tracer test and judges the connectedness between adjacent well.In water injection well, add tracer agent, if detect the tracer agent adding in inspection well, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with;
If judge that two mouthfuls of wells are disconnected, divide single horizontal well flow unit border, otherwise divide the flow unit border that is communicated with well group;
Second step, calculated level well drainage area;
In horizontal well, be lowered to pressure gauge, gaging pressure recovers data;
Obtain after pressure recovery data, adopt responding curve of well well-logging method, choose with single horizontal well or be communicated with the construction location of well group, the boundary model calculating drainage area that reservoir distribution scope conforms to;
The 3rd step, determines Reservoir Body number and the fluid properties of horizontal well control;
The first step is determined single horizontal well or is communicated with the Reservoir Body number of well group control.By the production run of the single horizontal well of Real-Time Monitoring or connection well group, analyzing oil and gas production decline law in time, if oil gas production decline law is in time two exponential tapers, judge and have multiple Reservoir Bodies to participate in feed flow, successively decrease if oil gas production decline law is in time single index, judgement is that single Reservoir Body participates in feed flow;
In conjunction with Seismic reflection character and reservoir distribution scope, in drainage area, determine the particular location of single or multiple Reservoir Bodies;
According to single horizontal well or connection well group different times PVT sampling data and oil gas aquation certification of registered capital material, the character of analyzing oil and gas water or other fluid situation over time, determines the fluid properties of each Reservoir Body.
The 4th step, sets up numerical well testing model, the rationality on insolation level well stream moving cell border;
Select pressure in second step to recover data, use numerical well testing module in Saphir software, set up the numerical well testing model of following single horizontal well or connection well group: load the omnidistance pressure of each well, yield data, using drainage area in second step as peripheral boundary, each Reservoir Body is as seepage flow variation zone independently in drainage area, and gives assignment with the weighted mean value of thickness in work area and factor of porosity;
Adopt PEBI grid and numerical technology, the numerical value of each Reservoir Body mobility ratio and dispersion ratio in debugging drainage area, until pressure matched curve and the measured curve similarity of the numerical well testing model of building are high, related coefficient reaches designing requirement, the permeability magnitude of each region interpretation meets geologic feature, judges that the flow unit boundary demarcation of single horizontal well or connection well group is reasonable; Otherwise pressure matched curve and the measured curve similarity of the numerical well testing model of building are low, related coefficient does not reach designing requirement, need again to carry out the work of the first step-tetra-steps, until the pressure matched curve of the numerical well testing model of building and the related coefficient of measured curve reach designing requirement.
Below in conjunction with specific embodiment, the present invention is further elaborated:
By on January 15th, 2014, Ta Zhong I district had 65 oral examinations and adopts well, and in tower, totally 43 mouthfuls of 26,62 wellblocks, account for 66%, had employed flow unit and had not employed flow unit and divide for 26,62 wellblocks in tower.
1, interwell communication relation judgement:
The contrast of table 1 common method
Connected relation is analyzed:
In conjunction with the high connected relation determination methods of precision, the connected relation between well in 26,62 wellblocks in tower has been carried out analyzing judgement, mainly comprise the connected relation judgement of new well and the connected relation combing of old well.
(1) TZ26-2H, the connective judgement of TZ243 well group
The about 900m of distance between TZ26-2H well and TZ243 well.This well group carried out interference test test, content measurement is as follows: TZ26-2H well is perturbed well, carry out successively the excitement of back pressure test (oil nozzle size: 4mm, 5mm, 6mm, 7mm) and pressure buildup test, TZ243 well is inspection well, pressure in the constant situation of production system at the bottom of monitor well changes, and carries out excitement after approximately 455 hours at TZ26-2H well, and TZ243 well receives undesired signal, and obtain two groups of Trendline that slope is different, think that this well group is communicated with.
Table 2TZ26-2H and TZ243 well reservoir pressure contrast table
TZ243 and TZ26-2H go into operation respectively at 2007/7/7 and 2009/4/22, and the initial bottom pressure of TZ26-2H is about 43MPa, and initial reservoir pressure coefficient is about 0.99, and stratum is obviously in debt, judge that two wells are communicated with.Comprehensive above analysis judges that TZ26-2H and TZ243 well are communicated with.
(2) TZ62-7H, the connective judgement of TZ622 well group
The about 550m of distance between TZ62-7H well and TZ622 well, reservoir prediction figure shows two well reservoirs not in flakes, is communicated with possibility less.In conjunction with the same height above sea level pressure comparison of contemporaneity, two well pressures differ larger, may not be communicated with.
Later stage brought in well TZ62-7H pressure is higher than early stage brought in well TZ622, and comprehensive above analysis judges that TZ62-7H is not communicated with TZ622.
Table 3TZ622 and the contrast of TZ62-7H reservoir pressure
(3) TZ622-H2, the connective judgement of TZ62-6H well group
The about 920m of distance between TZ622-H2 well and TZ62-6H well, according to reservoir prediction, two well reservoirs are grown in flakes, think to exist to be communicated with possibility.
The sand face pressure monitoring of two wells shows that two well pressure drop trend are close, exists and is communicated with possibility; According to initial formation pressure data, after TZ622-H2 well, go into operation, reservoir pressure coefficient is 0.84, has obvious stratum deficit (as table 4), and the fluid properties of two wells changes identical (as table 5), comprehensively judges that TZ622-H2 is communicated with TZ62-6H.
Table 4TZ622-H2 and TZ62-6H reservoir pressure contrast table
Table 5TZ622-H2 and TZ62-6H formation fluid property contrast table
(4) TZ62-1, the connective judgement of TZ62-4H well group
TZ62-1 and TZ62-4H well be at a distance of about 300m, and reservoir prediction figure shows that two well reservoirs grow in flakes, exist and be communicated with possibility, and TZ621 well and offset well TZ62-4H be at a distance of 1300m, and reservoir prediction figure shows two well reservoir developments not in flakes, and connection possibility is less.
TZ62-4H and TZ62-1 go into operation respectively at 2009/5/7 and 2005/11/11, TZ62-4H operation initial stage pressure recovers to obtain reservoir pressure 37.84MPa,, there is obvious stratum deficit (as shown in table 6) in pressure coefficient 0.8, meets the pressure drop trend rule of unit, communicating slits hole.
Table 6TZ62-1 and TZ62-4H well reservoir pressure contrast table
| Pound sign | Test mode | Production time | TestDate | Dark in payzone | In dark pressure | Pressure coefficient |
| TZ62-1 | Press extensive | 2005.11.11 | 2005.09.15-11.02 | 4932.92 | 57.84 | 1.20 |
| TZ62-4H | Press extensive | 2009.05.07 | 2010.09.03-09.15 | 4882.97 | 37.84 | 0.80 |
Table 7TZ62-1 and TZ62-4H well formation fluid property contrast table
TZ62-1 well is respectively at 2011/10/11 and 2012/12/14 two-wheeled water filling, and TZ62-4H well is subject to effect obviously, and moisture obvious rising of later stage.Comprehensive judgement thinks that TZ62-1 well and TZ62-4H well are communicated with.
(5) TZ621, the connective judgement of TZ62-4H well group
TZ621 well is in high-order bit relatively, and bottom hole location is higher than TZ62-4H well bottom hole location, output gas oil ratio stable (about 500m left and right), and without pneumatic jack, the two is not communicated with to judge TZ621 and TZ62-4H according to Hydrocarbon Accumulation character.
Table 8TZ621 and TZ62-4H well formation fluid property contrast table
Therefore, comprehensive judgement thinks that TZ621 well and TZ62-4H well are not communicated with.
26 wellblocks in Well 62 field of Central Tarim and tower, judge that combing goes out to be communicated with 6 groups of well groups altogether.
Table 9 Well 62 field of Central Tarim is communicated with well group and divides table with 26 wellblocks in tower
When the dynamic data of monitoring should strengthen to(for) new well is particularly gone into operation, the test of original pressure, provides foundation to the evaluation of subsequent flowing unit.
Step 2, drainage area is determined:
The drainage area analysis of individual well or connection well group is intended to portray and retrain in conjunction with the peripheral boundary of static geologic information flow unit, in conjunction with 26,62 wellblock construction locations and reservoir distribution scope in tower, adopts square boundary to carry out the calculating of drainage area.
According to connected relation judged result, TZ62-1 and the TZ62-4H co-controlling flow unit that is interconnected, TZ621 controls separately another flow unit.In conjunction with " elongated rectangular shape shape " geologic feature, seismic reflection and property distribution, utilize yield data and stream to press historical, adopt the square boundary model in Ecrin platform Topaze module to portray constraint to two flow unit peripheral boundary, the rectangle drainage area that comprises TZ62-1 and TZ62-4H well group and TZ621, each boundary parameter is shown in table 40:
Table 10 individual well drainage boundary distance table
| Pound sign | Border 1 | Border 2 | Border 3 | Border 4 |
| TZ621 | 1240 | 311 | 671 | 233 |
| TZ62-1 | 756 | 286 | 255 | 296 |
| TZ62-4H | 715 | 318 | 505 | 397 |
According to the drainage boundary distance of single well-controlled, can sketch out single well-controlled drainage boundary distribution plan in the System planes of TZ621 seam hole, and then lay a good foundation for the foundation of numerical well testing model, after finally verifying by numerical well testing, accurately mark off and employed unit and do not employed cell distribution region, for interspaced well deployment from now on provides reliable basis.
26, the 62 existing pilot production Jing40Kou in wellblock in tower, in conjunction with the variation relation of production data and sand face pressure, each well drainage area is as shown in table 11.
26 wellblock part well drainage boundary summary sheets in table 11 Well 62 field of Central Tarim and tower
Step 3, Reservoir Body feature understanding:
Reservoir Body feature understanding need to comprehensively be analyzed in conjunction with many-sided professional data such as geology, earthquake, brill well logging, well logging, reservoir reconstruction, dynamic monitoring, fluid chemical examinations, its main contents comprise the number of Reservoir Body in flow unit and corresponding oil gas characteristic, portray to reach the object that in flow unit, different the flow domains distribute, for the foundation of follow-up numerical well testing model lays the foundation.
Instance analysis: TZ62-7H
TZ62-7H well location horizontal exploitation well of a bite in No. 62 lithologic trap north section in I Slope break belt tower in low protruding tower in Tarim Basin central uplift tower, spudded on May 6th, 2008, September 20 completion, October 7 in 2008 go into operation after Nikkei acid fracturing.
This well has adopted point 4 sections of acid fracturings to carry out reservoir reconstruction, learns that according to bottomhole wellbore pressure after each section of termination of pumping and the relation that accumulative total is injected liquid measure the 1st, 4 sections have been opened relatively independent Reservoir Body, and the 2nd, 3 sections have pressed off same Reservoir Body.
Recover double logarithmic curve form according to pressure, there is different percolation abilities region in TZ62-7H, possible cause is peripheral other Reservoir Bodies that exist, present the upper warp line of Different Slope in conjunction with the responding curve of well well-test curve later stage, for multiple Reservoir Bodies participate in the feature of feed flow, and on seismic section, show the seismic reflection type combination of weak reflection, weak beading and strong beading, comprehensively judge that TZ62-7H controls many cover Reservoir Bodies.
According to TZ62-7H pilot production situation, this well is with water steady production for a long time, and water outlet does not form impact to oil and gas production, and water is independent a set of Reservoir Body, average output gas oil ratio 688 of 30 days initial stages, crude oil and white oil mix out, oil, gas may be Reservoir Body independently mutually, higher in conjunction with part C1 gas measured value on logging presentation, bottom C1 gas measured value is on the low side, in well logging, TZ62-7H has obvious three cover reservoir distribution, and on seismic section, have and think that three kinds of corresponding different reflection type are (if be followed successively by from top to bottom reflection, weak beading, strong reflection), comprehensively think that the three cover Reservoir Bodies of TZ62-7H are respectively the condensate gas at top (if seismic reflection type is reflection), middle water (seismic reflection type is weak beading), the oil (seismic reflection type is strong beading) of bottom.
Therefore, adopt well for 26,62 wellblock 40 oral examinations in tower and carried out Reservoir Body feature understanding, portrayed distribution and the oil gas characteristic of Reservoir Body in each unit, for the later stage sets up numerical well testing model and carries out unit checking strong foundation is provided, concrete analysis result is as shown in table 12.
62,26 wellblock Reservoir Body mark sheets in table 12 tower
Step 4, numerical well testing model is set up and checking:
Portray and Reservoir Body signature analysis based on connected relation judgement, drainage area, in conjunction with individual well pressure buildup test data, set up the reliability that numerical well testing model is divided with checking flow unit, reach the object of meticulous division of flow units.
12 of 26,62 wellblocks flow unit in tower is carried out to numerical well testing checking at present, is verified as example with the numerical well testing of TZ623-H1, TZ62-11H and TZ62-2 well group, tri-flow units of TZ623-H2 and describes, be analyzed as follows:
(1)TZ623-H1
This well drops into pilot production on July 10th, 2012, carries out pressure buildup test 11 days-June 27 June in 2013, adopts closing well to press extensive data, and substitution saphir Well Testing Software, carries out Numerical Well Test Analysis.
This input parameter
Table 13 basic parameter table fruit data
This well thinks that single well control unit area is larger by analysis, can be divided into inner high peripheral hypotonic two regions that blend by its relative percolation ability, inner region area is about 1.876x105m2, permeability 1.58md, peripheral hypotonic district supplies with area and is about 2.267x105m2, permeability 0.158md.Numerical well testing fitting effect is better, illustrates that the division of TZ623-H1 well stream moving cell is reliable.
(2) TZ62-2 and TZ62-11H well group
TZ62-2 and TZ62-11H well group are one and are communicated with well group, and the test data of two mouthfuls of wells is carried out to preliminary comparison screening, and this well group uses TZ62-2 well for analyzing well, TZ62-11H well location auxiliary reference well.TZ62-2 drops into pilot production on Dec 22nd, 2005, carry out pressure buildup test 2 days-January 23 January in 2009, adopt SIP (shut-in pressure) to recover data, in conjunction with omnidistance pressure, production history data substitution saphir Well Testing Software, carry out omnidistance pressure value well test analysis.
1. this input parameter
Table 14 basic parameter table
This well group thinks that control module area is larger by analysis, is divided into San Gegaoshen district and peripheral two hypotonic districts, have tomography, but tomography not exclusively seals in unit.Gao Shen district total area 3.167x105m2, Area-weighted mean permeability 13md, peripheral hypotonic district's aggregate supply area 4.74x105m2, Area-weighted mean permeability 0.5376md, numerical well testing fitting effect is better, illustrates that this well group flow unit division is reliable.
(3) TZ623-H2 well
TZ623-H2 well drops into pilot production on July 31st, 2012, carry out pressure buildup test 14 days-July 3 June in 2013, adopt SIP (shut-in pressure) to recover data, in conjunction with omnidistance pressure, production history data substitution saphir Well Testing Software, carry out omnidistance pressure value well test analysis.
1. basic input parameters
Table 15 basic parameter table
This well group thinks that control module area is larger by analysis, is divided into Liang Ge Relative High Permeability district and peripheral hypotonic district.Gao Shen district total area 2.94x105m
2, Area-weighted mean permeability 3.2437md, peripheral hypotonic district's aggregate supply area 2.28x105m
2, Area-weighted mean permeability 0.2396md, numerical well testing fitting effect is better, illustrates that this well group flow unit division is reliable.
26 wellblocks in tower and Well 62 field of Central Tarim institute division of flow units are set up to numerical well testing model and verify, shown in table 46, dividing elements is all reliable.
Table 16 numerical well testing model
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a carbonatite horizontal well flow unit division methods, is characterized in that, this carbonatite horizontal well flow unit division methods comprises the following steps:
Step 1, select adjacent Liang Koujing, the judgement of interwell communication relation;
Step 2, in horizontal well, be lowered to pressure gauge, gaging pressure recovers data; Obtain after pressure recovery data, adopt responding curve of well well-logging method, choose with single horizontal well or be communicated with the construction location of well group, the boundary model calculating drainage area that reservoir distribution scope conforms to;
Step 3, in conjunction with Seismic reflection character and reservoir distribution scope, in drainage area, determine the particular location of single or multiple Reservoir Bodies; According to single horizontal well or connection well group different times PVT sampling data and oil gas aquation certification of registered capital material, the character of analyzing oil and gas water or other fluid situation over time, determines the fluid properties of each Reservoir Body;
Step 4, select in second step pressure to recover data, use numerical well testing module in Saphir software, set up following single horizontal well or be communicated with the numerical well testing model of well group; Adopt PEBI grid and numerical technology, the numerical value of each Reservoir Body mobility ratio and dispersion ratio in debugging drainage area, until pressure matched curve and the measured curve similarity of the numerical well testing model of building are high, related coefficient reaches designing requirement, the permeability magnitude of each region interpretation meets geologic feature, judges that the flow unit boundary demarcation of single horizontal well or connection well group is reasonable; Otherwise pressure matched curve and the measured curve similarity of the numerical well testing model of building are low, related coefficient does not reach designing requirement, need again to carry out the work, until the pressure matched curve of the numerical well testing model of building and the related coefficient of measured curve reach designing requirement.
2. carbonatite horizontal well flow unit division methods as claimed in claim 1, is characterized in that, in step 1, the method for interwell communication relation judgement comprises two kinds of methods:
Method one, does interference test test and judges the connectedness between adjacent well, and in interference test test, perturbed well sends exciting signal, if monitor at inspection well the signal that perturbed well sends, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with; Method two, does tracer test and judges the connectedness between adjacent well, adds tracer agent in water injection well, if detect the tracer agent adding in inspection well, judge that two mouthfuls of wells are communicated with, otherwise judgement is not communicated with.
3. carbonatite horizontal well flow unit division methods as claimed in claim 2, is characterized in that, if judge that two mouthfuls of wells are disconnected, divides single horizontal well flow unit border, otherwise divides the flow unit border that is communicated with well group.
4. carbonatite horizontal well flow unit division methods as claimed in claim 1, is characterized in that, in step 3, determines the Reservoir Body number of single horizontal well or the control of connection well group; By the production run of the single horizontal well of Real-Time Monitoring or connection well group, analyzing oil and gas production decline law in time, if oil gas production decline law is in time two exponential tapers, judge and have multiple Reservoir Bodies to participate in feed flow, successively decrease if oil gas production decline law is in time single index, judgement is that single Reservoir Body participates in feed flow.
5. carbonatite horizontal well flow unit division methods as claimed in claim 1, it is characterized in that, in step 4, numerical well testing model comprises: load the omnidistance pressure of each well, yield data, using middle drainage area as peripheral boundary, each Reservoir Body is as seepage flow variation zone independently in drainage area, and gives assignment with the weighted mean value of thickness in work area and factor of porosity.
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