CN104453836A - Multiple-stratum-series tight sandstone gas reservoir well spacing method - Google Patents
Multiple-stratum-series tight sandstone gas reservoir well spacing method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000004576 sand Substances 0.000 claims abstract description 82
- 238000011161 development Methods 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 18
- 230000002349 favourable effect Effects 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims description 59
- 238000011234 economic evaluation Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 230000008901 benefit Effects 0.000 claims description 8
- 238000011160 research Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
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- 238000004451 qualitative analysis Methods 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
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- 235000013619 trace mineral Nutrition 0.000 claims description 3
- 239000011573 trace mineral Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002356 single layer Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention discloses a multiple-stratum-series tight sandstone gas reservoir well spacing method. The method includes the following steps that first, based on high-resolution sequence stratigraphy, distribution of sand bodies is depicted, an effective reservoir stratum is predicted through the earthquake and well logging technology, and an enrichment region is preferentially selected; second, based on a favorable region, a longitudinal structure of the sand bodies is fine dissected through the geology and well logging technology, and therefore the horizontal distribution law of the sand bodies can be researched; third, in the preferential favorable region, well spacing is performed according to conditions. The well spacing method is reasonable and takes the complex geology that multiple gas-bearing series longitudinally develop in an upper palaeozoic tight sandstone gas reservoir, the single layer yield is low and the lateral variety of the reservoir stratum is fast into consideration, the drilling success of a development well can be guaranteed, the development effect can be improved to the maximum extent, and the economical and effective development of the tight sandstone gas reservoir is achieved.
Description
Technical field
The present invention relates to natural gas extraction field, relate in particular to a kind of multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well-arranging procedure.
Background technology
There is no the well spacing technology of ripe multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS both at home and abroad, existing well spacing technology major part is the oil-gas reservoir for structure type, for multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well spacing technology, there is no new research method and achievement appearance at present.
Multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS grows many cover gassiness series of strata, but advantage reservoir is not given prominence to, and individual layer yields poorly; Horizontal reservoir change is fast, and non-homogeneity is strong, and economical and effective development difficulty is large.Due to DAMAGE OF TIGHT SAND GAS RESERVOIRS depositional stage by sea-land alternately and the complicated palaeodrainage pattern of transition and the control in thing source, sedimentary facies belt and deposition characteristics change greatly, sand body change greatly, diagenesis types is complicated, cause reservoir fine and close, without natural production capacity, usually need reservoir reconstruction or use the economic development of advanced production practice technology ability.It is low that tight gas reservoir has permeability, and compact sandstone gas refers to that permeability is less than the sandstone reservoirs of 0.1mD under formation condition, and natural production capacity is low; Through MHF, or adopt horizontal well, multilateral well, the features such as ability output industrial gas.Structure type oil-gas reservoir well spacing technology carries out well site deployment in the trap structure of implementing, because constructivity oil-gas reservoir reservoir is block growth mostly, as long as well site deployment is in the trap structure of implementing.For this kind of gas reservoir of multilayer system Sandstone Gas Reservoir, the key of well site deployment is not only and is wanted reservoir to exist, but also will be in the favored site of rich accumulation of oil and gas.Well logging and gas reservoir engineering optimize a well spacing technology indispensable technology, at the gas field development initial stage, logging technique can be utilized to evaluate the lithology of reservoir, electrical, physical property and gas-bearing property, for Single Well Evaluation, but larger for well site deployment difficulty; Utilizing gas reservoir engineering technology, for evaluating gas well deliverability, stable yields feature and interwell communication situation, being applicable to the well site deployment of gas field development middle and later periods.Therefore above-mentioned different technologies also exists professional difficult point and limitation.
Summary of the invention
For the problems referred to above, the invention provides a kind of multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well-arranging procedure, to solve the problems of the prior art.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well-arranging procedure, is characterized in that, comprise the following steps:
Step (1), based on High Resolution Sequence Stratigraphy, portrays sandbody distribution, in conjunction with earthquake and logging technique, and prediction Effective Reservoirs, preferred enrichment region;
A, according to reservoir geology feature, choose upper and lower isochronous surface, and must near the time that Caledonian tectonic movement terminates and Hercynian movement starts, set up High-Resolution Sequence Stratigraphic Framework, according to the impact that depositional fabric, depositional configuration, the stacked pattern of sand body, sand mud change than feature, accommodating space mechanism and A/S ratio condition, analyze upper palaeozoic level cycle structure, set up High-Resolution Sequence Stratigraphic Framework;
B, based on rock core, thin slice, outcrop data, in conjunction with oxygen and carbon isotopes, trace element, intrusive mercury curve test, divide each substratum sedimentary subfacies and sedimentary micro type, form each Reservoir Section sedimentary microfacies map, divide favourable sedimentary micro;
C, application seismic wave characteristic analytical technology, wave impedance inversion technique, prediction sand body and net sandstone; And combine well logging, geological method, drawing each Reservoir Section has sand body and effective thickness flat distribution map;
D, enrichment region are preferred: consider Macrocosm and microcosm, the dynamic and stalic state, combination of qualitative and quantitative analysis, carry out Comprehensive Evaluation of Reservoir, set up enrichment region preferred standard, and then preferably build product enrichment region, for multilayer system tight gas reservoir well spacing lays the foundation;
Step (2) based on Favorable Areas, in conjunction with geology and logging technique, fine dissection sand body vertical structure, and then research sand body planar distribution;
A, based on high-resolution Stratigraphic framework, according to logging character, divide ultrashort cycle unit, sum up single sand body form and scale;
B, with " well " i section, gas field to be dissected comprehensively; Add up each substratum single sand body thickness, comprehensively determine flakiness ratio, aspect ratio according to gas field sedimentary characteristic in conjunction with empirical formula method, Gudao oilfield analogy method, Liulin County, Shanxi Province outcrop, Qiu Yinan, Li Si field model; And then determine width and the length of single sand body and composed sand body;
C, according to gas field section anatomical results, in conjunction with the downcutting in river and side is long-pending act on, the sand body stacked pattern of longitudinal direction and cross direction profiles feature are summed up in research; Divide the superimposed district of polygon formula, the superimposed district of multiple field, sand body isolates formula development area;
Step (3) is in preferred Favorable Areas, and meeting following condition can integral deployment horizontal well:
1. sand body is stacked based on isolated formula, and interval of interest sand thickness is greater than 8m, and effective thickness is greater than 5m;
2. reserves concentration degree is greater than 75%, and advantage reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. reserves abundance is greater than horizontal well economic limit abundance;
Economic limit abundance evaluates the minimum economic limit cumulative gas of horizontal well in conjunction with the dynamic economy method of limits according to the gross investment of horizontal well individual well, again according to horizontal well Control section recovery percent of reserves, in conjunction with horizontal well patterns, finally calculate horizontal well development interval economic limit reserves abundance;
4. horizontal well horizontal segment direction is best with vertical block biggest principal stress direction, and as far as possible along main stem direction; Horizontal section length is comprehensively determined in conjunction with scale of sand bodies, technology, economic evaluation, numerical simulation; Well spacing array pitch considers scale of sand bodies, economic evaluation, technological level and numerical simulation;
Step (4) in preferred Favorable Areas, meet following condition can the large well group of integral deployment straight/directional well:
1. sand body is stacked based on multiple field, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree is less than 60%, and longitudinally grow many cover gassiness series of strata, advantage reservoir is not given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. straight/directional well is disposed based on large well group; Well clump Number synthesis considers technique, economic evaluation, well site topography and geomorphology factor;
Step (5) is in preferred Favorable Areas, and meeting following condition can integral deployment well cluster horizontal well+straight/directional well:
1. sand body is stacked based on polygon formula, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree 60 ~ 75%, longitudinally grow many cover gassiness series of strata, local superiority's reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. East and West direction implements sand body to disposing straight/directional well, and horizontal well is disposed in north-south, based on 9 well clumps, not only improves the longitudinal reserves exploitation degree of reservoir but also improve well yield;
The complicated geologicals such as the present invention can longitudinally grow many cover gassiness series of strata for upper palaeozoic DAMAGE OF TIGHT SAND GAS RESERVOIRS, individual layer yields poorly, reservoir cross directional variations is fast, well-arranging procedure is reasonable, the drilling well success of development well can be guaranteed, and farthest can improve development effectiveness, realize the exploitation of DAMAGE OF TIGHT SAND GAS RESERVOIRS economical and effective.The present invention surveys well spacing gas-bearing formation Drilling ratio 100% in gas field, Shenmu County, Chang Qingqi district, drilling well 329 mouthfuls, drilling success 100%.Gas testing 179 mouthfuls, 177 mouthfuls of wells obtain industrial gas, gas testing open-flow capacity maximum 63.74 × 10
4m
3/ d, average 11.2 × 10
4m
3/ d, development effectiveness is good, and large well group exploitation can save a large amount of soil, saving comprises well site expense, collects the substantial contribution such as defeated expense, gas well management fee, also can save time simultaneously.
The detailed description and obtaining that feature of the present invention can consult the graphic and following better embodiment of this case is well understood to.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below in conjunction with specific embodiment.
See Fig. 1, a kind of multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well-arranging procedure, comprises the following steps:
Step (1), based on High Resolution Sequence Stratigraphy, portrays sandbody distribution, in conjunction with earthquake and logging technique, and prediction Effective Reservoirs, preferred enrichment region;
A, according to reservoir geology feature, choose upper and lower isochronous surface, and must near the time that Caledonian tectonic movement terminates and Hercynian movement starts, set up High-Resolution Sequence Stratigraphic Framework, according to the impact that depositional fabric, depositional configuration, the stacked pattern of sand body, sand mud change than feature, accommodating space mechanism and A/S ratio condition, analyze upper palaeozoic level cycle structure, set up High-Resolution Sequence Stratigraphic Framework;
B, based on rock core, thin slice, outcrop data, in conjunction with oxygen and carbon isotopes, trace element, intrusive mercury curve test, divide each substratum sedimentary subfacies and sedimentary micro type, form each Reservoir Section sedimentary microfacies map, divide favourable sedimentary micro;
C, application seismic wave characteristic analytical technology, wave impedance inversion technique, prediction sand body and net sandstone; And combine well logging, geological method, drawing each Reservoir Section has sand body and effective thickness flat distribution map;
D, enrichment region are preferred: consider Macrocosm and microcosm, the dynamic and stalic state, combination of qualitative and quantitative analysis, carry out Comprehensive Evaluation of Reservoir, set up enrichment region preferred standard, and then preferably build product enrichment region, for multilayer system tight gas reservoir well spacing lays the foundation;
(1) sedimentary micro is mainly channel bar, distributary channel and distributary channel;
(2) reservoir properties is better, and based on middle coarse quartz grain sandstone, landwaste quartz sandstone, aperture combination is based on intergranular pore, dissolution pore, intracrystalline pore, and Areal porosity is greater than 2%, and degree of porosity is greater than 8%, and permeability is greater than 0.5mD;
(3) each interval sand body gross thickness is greater than 10m, and Effective Reservoirs thickness is greater than 5m;
(4) gas testing open-flow capacity is greater than 2 × 10
4m
3/ d;
(5) reserves abundance is greater than 0.5 × 10
8m
3/ km
2;
(6) reservoir wave impedance value is 10000 ~ 11000g/cm
3.m/s;
(7) there is " ten " word survey line of reliable in quality or single survey line;
(8) reservoir is laterally stablized with genesis analysis, and of certain scale, its offset well gas testing open-flow capacity reaches industrial gas, and production feature is relatively stable.
Step (2) based on Favorable Areas, in conjunction with geology and logging technique, fine dissection sand body vertical structure, and then research sand body planar distribution;
A, based on high-resolution Stratigraphic framework, according to logging character, divide ultrashort cycle unit, sum up single sand body form and scale;
B, with " well " i section, gas field to be dissected comprehensively; Add up each substratum single sand body thickness, flakiness ratio (70 ~ 1004) is comprehensively determined in conjunction with empirical formula method, Gudao oilfield analogy method, Liulin County, Shanxi Province outcrop, Qiu Yinan, Li Si field model: 1, aspect ratio (2 ~ 4): 1 according to gas field sedimentary characteristic; And then determine width and the length of single sand body and composed sand body;
C, according to gas field section anatomical results, in conjunction with the downcutting in river and side is long-pending act on, the sand body stacked pattern of longitudinal direction and cross direction profiles feature are summed up in research; Divide the superimposed district of polygon formula, the superimposed district of multiple field, sand body isolates formula development area;
Step (3) is in preferred Favorable Areas, and meeting following condition can integral deployment horizontal well:
1. sand body is stacked based on isolated formula, and interval of interest sand thickness is greater than 8m, and effective thickness is greater than 5m;
2. reserves concentration degree is greater than 75%, and advantage reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. reserves abundance is greater than horizontal well economic limit abundance;
Economic limit abundance evaluates the minimum economic limit cumulative gas of horizontal well in conjunction with the dynamic economy method of limits according to the gross investment of horizontal well individual well, again according to horizontal well Control section recovery percent of reserves, in conjunction with horizontal well patterns, finally calculate horizontal well development interval economic limit reserves abundance;
4. horizontal well horizontal segment direction is best with vertical block biggest principal stress direction, and as far as possible along main stem direction; If Chang Qingqi district biggest principal stress direction is approximately EW, main stem is nearly north-south, and north-south can be selected in levelness direction; Horizontal section length is comprehensively determined in conjunction with scale of sand bodies, technology, economic evaluation, numerical simulation; As Chang Qingqi district horizontal section length 1200 ~ 1500m; Well spacing array pitch considers scale of sand bodies, economic evaluation, technological level and numerical simulation;
Step (4) in preferred Favorable Areas, meet following condition can the large well group of integral deployment straight/directional well:
1. sand body is stacked based on multiple field, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree is less than 60%, and longitudinally grow many cover gassiness series of strata, advantage reservoir is not given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. straight/directional well is disposed based on large well group; Well clump Number synthesis considers technique, economic evaluation, well site topography and geomorphology factor; If Chang Qingqi district is based on 9 well clumps.
Step (5) is in preferred Favorable Areas, and meeting following condition can integral deployment well cluster horizontal well+straight/directional well:
1. sand body is stacked based on polygon formula, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree 60 ~ 75%, longitudinally grow many cover gassiness series of strata, local superiority's reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. East and West direction implements sand body to disposing straight/directional well, and horizontal well is disposed in north-south, based on 9 well clumps, not only improves the longitudinal reserves exploitation degree of reservoir but also improve well yield;
The complicated geologicals such as the present invention can longitudinally grow many cover gassiness series of strata for upper palaeozoic DAMAGE OF TIGHT SAND GAS RESERVOIRS, individual layer yields poorly, reservoir cross directional variations is fast, well-arranging procedure is reasonable, the drilling well success of development well can be guaranteed, and farthest can improve development effectiveness, realize the exploitation of DAMAGE OF TIGHT SAND GAS RESERVOIRS economical and effective.The present invention surveys well spacing gas-bearing formation Drilling ratio 100% in gas field, Shenmu County, Chang Qingqi district, drilling well 329 mouthfuls, drilling success 100%.Gas testing 179 mouthfuls, 177 mouthfuls of wells obtain industrial gas, gas testing open-flow capacity maximum 63.74 × 10
4m
3/ d, average 11.2 × 10
4m
3/ d, development effectiveness is good, and large well group exploitation can save a large amount of soil, saving comprises well site expense, collects the substantial contribution such as defeated expense, gas well management fee, also can save time simultaneously.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and manual; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in claimed scope of the present invention.The protection domain of application claims is defined by appending claims and equivalent thereof.
Claims (1)
1. a multilayer system DAMAGE OF TIGHT SAND GAS RESERVOIRS well-arranging procedure, is characterized in that, comprise the following steps:
Step (1), based on High Resolution Sequence Stratigraphy, portrays sandbody distribution, in conjunction with earthquake and logging technique, and prediction Effective Reservoirs, preferred enrichment region;
A, according to reservoir geology feature, choose upper and lower isochronous surface, and must near the time that Caledonian tectonic movement terminates and Hercynian movement starts, set up High-Resolution Sequence Stratigraphic Framework, according to the impact that depositional fabric, depositional configuration, the stacked pattern of sand body, sand mud change than feature, accommodating space mechanism and A/S ratio condition, analyze upper palaeozoic level cycle structure, set up High-Resolution Sequence Stratigraphic Framework;
B, based on rock core, thin slice, outcrop data, in conjunction with oxygen and carbon isotopes, trace element, intrusive mercury curve test, divide each substratum sedimentary subfacies and sedimentary micro type, form each Reservoir Section sedimentary microfacies map, divide favourable sedimentary micro;
C, application seismic wave characteristic analytical technology, wave impedance inversion technique, prediction sand body and net sandstone; And combine well logging, geological method, drawing each Reservoir Section has sand body and effective thickness flat distribution map;
D, enrichment region are preferred: consider Macrocosm and microcosm, the dynamic and stalic state, combination of qualitative and quantitative analysis, carry out Comprehensive Evaluation of Reservoir, set up enrichment region preferred standard, and then preferably build product enrichment region, for multilayer system tight gas reservoir well spacing lays the foundation;
Step (2) based on Favorable Areas, in conjunction with geology and logging technique, fine dissection sand body vertical structure, and then research sand body planar distribution;
A, based on high-resolution Stratigraphic framework, according to logging character, divide ultrashort cycle unit, sum up single sand body form and scale;
B, with " well " i section, gas field to be dissected comprehensively; Add up each substratum single sand body thickness, comprehensively determine flakiness ratio, aspect ratio according to gas field sedimentary characteristic in conjunction with empirical formula method, Gudao oilfield analogy method, Liulin County, Shanxi Province outcrop, Qiu Yinan, Li Si field model; And then determine width and the length of single sand body and composed sand body;
C, according to gas field section anatomical results, in conjunction with the downcutting in river and side is long-pending act on, the sand body stacked pattern of longitudinal direction and cross direction profiles feature are summed up in research; Divide the superimposed district of polygon formula, the superimposed district of multiple field, sand body isolates formula development area;
Step (3) is in preferred Favorable Areas, and meeting following condition can integral deployment horizontal well:
1. sand body is stacked based on isolated formula, and interval of interest sand thickness is greater than 8m, and effective thickness is greater than 5m;
2. reserves concentration degree is greater than 75%, and advantage reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. reserves abundance is greater than horizontal well economic limit abundance;
Economic limit abundance evaluates the minimum economic limit cumulative gas of horizontal well in conjunction with the dynamic economy method of limits according to the gross investment of horizontal well individual well, again according to horizontal well Control section recovery percent of reserves, in conjunction with horizontal well patterns, finally calculate horizontal well development interval economic limit reserves abundance;
4. horizontal well horizontal segment direction is best with vertical block biggest principal stress direction, and as far as possible along main stem direction; Horizontal section length is comprehensively determined in conjunction with scale of sand bodies, technology, economic evaluation, numerical simulation; Well spacing array pitch considers scale of sand bodies, economic evaluation, technological level and numerical simulation;
Step (4) in preferred Favorable Areas, meet following condition can the large well group of integral deployment straight/directional well:
1. sand body is stacked based on multiple field, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree is less than 60%, and longitudinally grow many cover gassiness series of strata, advantage reservoir is not given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. straight/directional well is disposed based on large well group; Well clump Number synthesis considers technique, economic evaluation, well site topography and geomorphology factor;
Step (5) is in preferred Favorable Areas, and meeting following condition can integral deployment well cluster horizontal well+straight/directional well:
1. sand body is stacked based on polygon formula, and longitudinal sand thickness is greater than 10m, and effective thickness is greater than 5m;
2. reserves concentration degree 60 ~ 75%, longitudinally grow many cover gassiness series of strata, local superiority's reservoir is given prominence to;
Reserves concentration degree=(individual layer oil in place/reservoir gross reserves) × 100%;
3. East and West direction implements sand body to disposing straight/directional well, and horizontal well is disposed in north-south, based on 9 well clumps, not only improves the longitudinal reserves exploitation degree of reservoir but also improve well yield.
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| CN106246158A (en) * | 2016-08-15 | 2016-12-21 | 中国石油天然气股份有限公司 | Method and device for distributing wells in ultra-deep low-hole fractured sandstone gas reservoir |
| CN106437631A (en) * | 2016-09-12 | 2017-02-22 | 中国石油天然气股份有限公司 | Oil reservoir exploitation method and device thereof |
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