CN104110243A - Method for combination exploitation of planar adjacent small fault blocks by cross-fault-block horizontal well - Google Patents
Method for combination exploitation of planar adjacent small fault blocks by cross-fault-block horizontal well Download PDFInfo
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Abstract
The invention provides a method for combination exploitation of planar adjacent small fault blocks by cross-fault-block horizontal well. The method includes: through accurate geological research and structural interpretation, clearly determining geologic features and structural features of a research area; determining level difference of target horizons on two sides of a fault; computing controlled reserves and increasing recoverable reserves, and combining small fault block remaining oil enriched areas adjacent on a plane; optimally designing plane positions, vertical distance to the top and horizontal section length of multiple targets of the cross-fault-block horizontal well; performing on-site trajectory tracking regulation, judging drilling conditions, clearly determining the geologic position of a drill bit, and ensuring that the horizontal well successively drills and encounters an objective oil reservoir. By the aid of the method for combination exploitation of the planar adjacent small fault blocks by the cross-fault-block horizontal well, the problem of poor economic benefit of drilling in single planar remaining oil enriched areas of the complicated small fault blocks is solved, and the purpose of benefit exploitation of the complicated small fault blocks is achieved.
Description
Technical field
The present invention relates to Complex Fault Block Oil Reservoir ultra-high water cut stage and increase substantially waterflood recovery efficiency factor field, relate in particular to the method for a kind of utilization across the adjacent little faulted block of fault block horizontal well combined planar.
Background technology
Fault block oil reservoir is employed 15.3 hundred million tons of oils in place (accounting for Shengli Oil Field 35.4%); Year 8040000 tons of produce oils (accounting for Shengli Oil Field 29.5%), are the important Oil Reservoir Types in SHENGLI PETROLEUM AREA, current moisture height (91.2%), and new district less investment, it is outstanding that unbalance is adopted in storage.The scale that how to increase substantially old liberated area recovery ratio, maintenance residual recoverable reserves recoverable amount, becomes triumph fault block oil reservoir and develops the subject matter facing.Fault block oil reservoir type is various, in small complex fault block plane, have fracture system complexity, tomography is many, oken block, and single fault block area is little, oil sand body is many, reserves are little, such fault-block structure fragmentation, and part natural fault blocks oil area is little, be difficult to form flooding pattern, elasticity exploitation or the spot floodings of adopting in exploitation more, water drive control degree is lower, and recovery ratio is generally lower.Meanwhile, because geological knowledge exists gradually, after structure is implemented again, there is certain variation in craven fault combination, occurs that the high point of part is without well control system.Therefore, remaining oil mainly concentrates on tomography angle, structure He Wujing control zone, high-order bit, but be subject to cutting apart of tomography, enrichment region in flakes property is poor, the little small complex fault block reserves control degree that causes of single oil area is low, water drive control degree is low, but single little fault block, on a small scale the independent drilling well in remaining oil enriched area is uneconomical.Therefore this class oil reservoir of exploitation that needs to adopt new method economical and efficient, further improves recovery ratio.We have invented the method for a kind of new utilization across the adjacent little faulted block of fault block horizontal well combined planar for this reason, have solved above technical problem.
Summary of the invention
The object of this invention is to provide the method for a kind of utilization across the adjacent little faulted block of fault block horizontal well combined planar, solve the single remaining oil enriched area drilling well of small complex fault block plane deficiency in economic performance problem, realize the object of small complex fault block benefit exploitation.
Object of the present invention can be achieved by the following technical measures: utilize the method across the adjacent little faulted block of fault block horizontal well combined planar, this utilization comprises across the method for the adjacent little fault block of fault block horizontal well combined planar remaining oil enriched area exploitation; Step 1, studies and structure interpretation by fine geology, specifies study area geologic feature and structural feature; Step 2, form and the position of portraying the definite disconnected rib of technology according to disconnected rib, utilize graphic joining method and layer position discrimination model method to two dish opposite joining relations and dock the degree of depth and differentiate, and determines the drop of tomography both sides destination layer interdigit; Step 3, successively, the Potentials of block-by-block, calculates and controls reserves and increase recoverable reserves, to single little fault block in plane, the uneconomic fault block of the independent drilling well in remaining oil enriched area carries out preferably on a small scale, and adjacent little fault block remaining oil enriched area on combined planar; Step 4, optimal design is across the plan-position of the multiple target spots of fault block horizontal well, vertical apart from apex distance from, horizontal section length; And step 5, follow the tracks of by preferred reference lamina and three-dimensional geological model, carry out on-the-spot track following regulation and control, situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores chance object oil reservoir.
Object of the present invention also can be achieved by the following technical measures:
In step 1, study the reservoir development feature of hard objectives layer position, physical property characteristic, profit distribution characteristics by fine geology; Explain hard objectives district structural feature and fracture system assemblage characteristic by fine structures.
In step 2, a common tomography is bored and is met by many mouthfuls of wells, bore the inclination angle of the breakpoint vertical depth computed tomography of meeting according to many mouthfuls of wells, according to the fault combination rule of seismic interpretation, calculate the width of each fault block, determine form and the position of disconnected rib according to well shake mould combination technology, utilize graphic joining method and layer position discrimination model method to differentiate two dish opposite joining relations and the docking degree of depth, determine the drop of tomography both sides destination layer interdigit, provide basis for optimizing target spot track.
In step 3, consider complex structural well and be suitable for geological conditions and these factors of economic policy boundary, single little fault block, small-scale remaining oil enriched area in plane are carried out preferably, by the little fault block remaining oil enriched area across adjacent on tomography horizontal well combined planar.
In step 4, according to earthquake material computation tomography crack width, combining target district Geologic Structure Feature, optimal design target position and horizontal section length.
In step 4, carry out a layer top anticipation according to finishing drilling horizontal well data, calculate shot design end face construction depth.
In step 4, according to the rhythm of reservoir, physical property characteristic and oil water relation, each target spot of optimal design apart from position, top, apart from the distance of oil-water interfaces.
In step 5, preferably reference lamina control enters the track adjustment before target, formulate risk prediction scheme, to creep into time, may run into situation analysis and game, controlling site operation situation, and by wellbore trace to three-dimensional geological model, the predictive ability having according to model itself and at any time updating ability, situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores chance object oil reservoir.
Utilization of the present invention is across the method for the adjacent little faulted block of fault block horizontal well combined planar, on the basis of meticulous pool description and remaining oil analysis and research, by block-by-block Potentials successively, plane and longitudinal remaining oil distribution are combined, utilize graphic joining method and layer position discrimination model method to differentiate two dish opposite joining relations and the docking degree of depth, determine the drop of tomography both sides destination layer interdigit, for shot design provides foundation, utilize reference lamina and three-dimensional geological model, carry out on-the-spot track following regulation and control, accurately situation is crept in judgement, specify the geologic position at drill bit place, guarantee that horizontal well successfully bores chance object oil reservoir.The method utilization has successfully realized " manually in flakes " of adjacent fault block remaining oil across tomography horizontal well, improved reserves control and development degree, has realized benefit exploitation.Utilize graphic joining method and layer position discrimination model, accurately calculated the drop of tomography Amphidiscosa mark layer interdigit, for horizontal segment adjustment section provides foundation.The technology of the present invention thinking is clear, application simple, for combination and exploitation, the benefit exploitation of the adjacent little remaining oil enriched area of plane of realizing small complex fault block provide practicable method.
Brief description of the drawings
Fig. 1 is the flow chart of utilization of the present invention across a specific embodiment of the method for the adjacent little faulted block of fault block horizontal well combined planar;
Fig. 2 is the design object district substratum end face constructional drawing in a specific embodiment of the present invention;
Fig. 3 is the graphic joining method ideograph in a specific embodiment of the present invention;
Fig. 4 is the layer position discrimination model figure in a specific embodiment of the present invention;
Fig. 5 is 3X177 piece 5-1 substratum remaining oil distribution figure in a specific embodiment of the present invention and 3-41 piece 5-2 substratum remaining oil distribution figure forever;
Fig. 6 is the profile position schematic diagram of four shot designs of horizontal well in a specific embodiment of the present invention;
Fig. 7 is the on-the-spot model following track optimizing control in a specific embodiment of the present invention.
Detailed description of the invention
For above and other object of the present invention, feature and advantage can be become apparent, cited below particularly go out preferred embodiment, and coordinate appended graphicly, be described in detail below.
As shown in Figure 1, Fig. 1 is the flow chart of utilization of the present invention across a specific embodiment of the method for the adjacent little faulted block of fault block horizontal well combined planar.
In step 101, study and structure interpretation by fine geology, specify study area geologic feature and structural feature.In one embodiment, utilize geology, well logging, well logging, seismic data to carry out fine geology research and fine structures explanation to target area, specify reservoir characteristic, structural feature and the fracture system assemblage characteristic of the husky two section of 5 layer of sand group in study area.Fig. 2 is the husky two section of 5 layer of sand group 5-1 substratum end face constructional drawing in the design object district in a specific embodiment of the present invention, and horizontal well design district is two natural fault blocks by F1, F2, F3, tetra-faults control of F4.Flow process enters into step 102.
In step 102, determine form and the position of the rib that breaks according to the disconnected rib technology of portraying, utilize graphic joining method and layer position discrimination model method to differentiate two dish opposite joining relations and the docking degree of depth, determine the drop of tomography both sides destination layer interdigit.A common tomography is bored and is met by many mouthfuls of wells, bore the inclination angle of the breakpoint vertical depth computed tomography of meeting according to many mouthfuls of wells, according to the fault combination rule of seismic interpretation, calculate the width of each fault block, determine form and the position of disconnected rib according to well shake mould combination technology, utilization utilizes graphic joining method and layer position discrimination model method to differentiate two dish opposite joining relations and the docking degree of depth, determines the drop of tomography both sides destination layer interdigit, provides basis for optimizing target spot track.In one embodiment, utilize disconnected rib to portray the occurrence that technology, co-hade computational methods are accurately portrayed crossover fault, in Fig. 3, utilize graphic joining method, asked for horizontal well design target zone piece 5-1 substratum 3 oblique 177 fault blocks and the 5-2 substratum disconnected rib plan range D of 3-41 fault block different layers position forever forever.In Fig. 4, utilize layer position docking discrimination model method, two dish opposite joining relations and the docking degree of depth are differentiated, determine that the drop H between thrown side 5-1 and tomography upthrow 5-2 substratum is 14 meters, according to drilling technology boundary, every 1 meter of drop need to the section of adjustment be 14 meters, for horizontal segment adjustment section provides accurate data.Fig. 3 is the graphic joining method ideograph in a specific embodiment of the present invention, and Fig. 4 is the layer position discrimination model figure in a specific embodiment of the present invention.Flow process enters into step 103.
In step 103, successively, the Potentials of block-by-block, calculate and control reserves and increase recoverable reserves.To single little fault block in plane, the uneconomic fault block of the independent drilling well in remaining oil enriched area carries out preferably on a small scale, adjacent little fault block remaining oil enriched area on combined planar.Single little fault block, on a small scale the independent drilling well in remaining oil enriched area is uneconomical, by successively, the Potentials of block-by-block, calculates and controls reserves and increase recoverable reserves.Consider complex structural well and be suitable for the factors such as geological conditions and economic policy boundary, single little fault block, small-scale remaining oil enriched area in plane are carried out preferably.By the little fault block remaining oil enriched area across adjacent on tomography horizontal well combined planar.In one embodiment, successively block-by-block carries out remaining oil analysis and Potentials, and single little fault block, small-scale remaining oil enriched area in plane are carried out preferably.Calculate and control reserves and recoverable reserves.According to complex structural well economic and technical limit, the adjacent remaining oil enriched area of preferred compositions plane, be respectively 3X177 piece 5-1 substratum in Fig. 5 and 3-41 piece 5-2 substratum forever, Fig. 5 is 3X177 piece 5-1 substratum remaining oil distribution figure in a specific embodiment of the present invention and 3-41 piece 5-2 substratum remaining oil distribution figure forever, by realizing adjacent fault block remaining oil " manually in flakes " across tomography horizontal well, improving reserves control and employ, benefit exploitation.Flow process enters into step 104.
In step 104, optimal design is across the plan-position of the multiple target spots of fault block horizontal well, vertical apart from apex distance from, horizontal section length.In Fig. 6, due to the complexity of the geological conditions in complex fault block district, consider to bore and meet tomography, drill the necessity of target zone possibility, anti-collision, optimal design is across the fault block horizontal well plan-position, vertical apart from apex distance from, horizontal section length of flat 9 well four target spot A, B of 3-, C, D forever.According to earthquake material computation tomography crack width, combining target district Geologic Structure Feature, optimal design target position and horizontal section length.Carry out a layer top anticipation, accurate Calculation shot design end face construction depth according to finishing drilling horizontal well data.According to the rhythm of reservoir, physical property characteristic and oil water relation, each target spot of optimal design apart from position, top, apart from the distance of oil-water interfaces.Fig. 6 is the profile position schematic diagram of four shot designs of horizontal well in a specific embodiment of the present invention.Flow process enters into step 105.
In step 105, follow the tracks of by preferred reference lamina and three-dimensional geological model, carry out on-the-spot track following regulation and control, accurately situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores chance object oil reservoir., due to wellblock fracture system complexity, wellbore trace design reclines, crossover fault is implemented, and disconnected mistake has a big risk, and by on-the-spot tracking control, grasps and creeps into dynamically in time.Preferably reference lamina control enters the track adjustment before target, formulates risk prediction scheme, may run into situation analysis and game will creep into time, controls site operation situation.And by wellbore trace to three-dimensional geological model, the predictive ability having according to model itself and at any time updating ability, accurately situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores to meet object oil reservoir.Because target area two coils opposite joining relation complexity and geosteering well logging hysteresis drill bit, the sand two 4-3 layers that utilization design A target spot is positioned at husky two 5-2 substratums tops are as stablizing reference lamina, on space, adjust wellbore trace, input at the scene real-time drilling track data in geological model simultaneously, obtain actual tag layer individual-layer data, upgrade geological model, optimize wellbore trace, analyze FEWD with boring curve data, situation is crept in judgement simultaneously.Fig. 7 is the on-the-spot model following track optimizing control in a specific embodiment of the present invention.Flow process finishes.
The technology of the present invention thinking is clear, application simple, for combination and exploitation, the benefit exploitation of the adjacent little remaining oil enriched area of plane of realizing small complex fault block provide practicable method.The method obtains application in 3-1 complex fault block district forever at Dongxing oil fields in Shengli Yong'an oilfield, success design and finishing drilling across fault block horizontal well 3 flat 9 wells forever, realize two adjacent little fault blocks of plane 3X177 piece 5-1 substratum and combination and exploitation of 3-41 piece 5-2 substratum forever forever.3X177 piece 5-1 substratum oil area 0.038 × 104km forever
2, effective thickness 10m, 5.7 ten thousand tons of oils in place, recovery ratio is according to 50% calculating, 2.5 ten thousand tons of residual recoverable reserves.3-41 piece 5-2 substratum oil area 0.0234 × 104km forever
2, effective thickness 15m, 5.23 ten thousand tons of oils in place, recovery ratio is calculated by 50%, 2.6 ten thousand tons of residual recoverable reserves.Initial stage operation CD section, 60 tons of day produce oils, not moisture, 12.7 tons of day oil at present, moisture 86.7%, remarkable in economical benefits.
Claims (8)
1. utilize the method across the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, this utilization comprises across the method for the adjacent little fault block of fault block horizontal well combined planar remaining oil enriched area exploitation:
Step 1, studies and structure interpretation by fine geology, specifies study area geologic feature and structural feature;
Step 2, form and the position of portraying the definite disconnected rib of technology according to disconnected rib, utilize graphic joining method and layer position discrimination model method to two dish opposite joining relations and dock the degree of depth and differentiate, and determines the drop of tomography both sides destination layer interdigit;
Step 3, successively, the Potentials of block-by-block, calculates and controls reserves and increase recoverable reserves, to single little fault block in plane, the uneconomic fault block of the independent drilling well in remaining oil enriched area carries out preferably on a small scale, and adjacent little fault block remaining oil enriched area on combined planar;
Step 4, optimal design is across the plan-position of the multiple target spots of fault block horizontal well, vertical apart from apex distance from, horizontal section length; And
Step 5, follows the tracks of by preferred reference lamina and three-dimensional geological model, carries out on-the-spot track following regulation and control, and situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores chance object oil reservoir.
2. utilization according to claim 1, across the method for the adjacent little faulted block of fault block horizontal well combined planar, is characterized in that, in step 1, studies the reservoir development feature of hard objectives layer position, physical property characteristic, profit distribution characteristics by fine geology; Explain hard objectives district structural feature and fracture system assemblage characteristic by fine structures.
3. utilization according to claim 1 is across the method for the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, in step 2, a common tomography is bored and is met by many mouthfuls of wells, bore the inclination angle of the breakpoint vertical depth computed tomography of meeting according to many mouthfuls of wells, according to the fault combination rule of seismic interpretation, calculate the width of each fault block, determine form and the position of disconnected rib according to well shake mould combination technology, utilize graphic joining method and layer position discrimination model method to differentiate two dish opposite joining relations and the docking degree of depth, determine the drop of tomography both sides destination layer interdigit, provide basis for optimizing target spot track.
4. utilization according to claim 1 is across the method for the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, in step 3, consider complex structural well and be suitable for geological conditions and these factors of economic policy boundary, single little fault block, small-scale remaining oil enriched area in plane are carried out preferably, by the little fault block remaining oil enriched area across adjacent on tomography horizontal well combined planar.
5. utilization according to claim 1 is across the method for the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, in step 4, according to earthquake material computation tomography crack width, combining target district Geologic Structure Feature, optimal design target position and horizontal section length.
6. utilization according to claim 1, across the method for the adjacent little faulted block of fault block horizontal well combined planar, is characterized in that, in step 4, carries out a layer top anticipation according to finishing drilling horizontal well data, calculates shot design end face construction depth.
7. utilization according to claim 1 is across the method for the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, in step 4, according to the rhythm of reservoir, physical property characteristic and oil water relation, each target spot of optimal design apart from position, top, apart from the distance of oil-water interfaces.
8. utilization according to claim 1 is across the method for the adjacent little faulted block of fault block horizontal well combined planar, it is characterized in that, in step 5, preferably reference lamina control enters the track adjustment before target, formulate risk prediction scheme, to creep into time, may run into situation analysis and game, control site operation situation, and by wellbore trace to three-dimensional geological model, the predictive ability having according to model itself and at any time updating ability, situation is crept in judgement, specifies the geologic position at drill bit place, guarantees that horizontal well successfully bores chance object oil reservoir.
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Cited By (6)
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| CN106294915A (en) * | 2015-06-04 | 2017-01-04 | 中国石油化工股份有限公司 | Beach shallow sea oil field based on well group platform development well location method for designing |
| CN110424955A (en) * | 2019-06-19 | 2019-11-08 | 中国石油化工股份有限公司 | A kind of complex fault block inside Tapping Potential Method |
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