CN105678082A - Dual-pressure-drop method for recognizing oil and gas well acid fracturing communication reservoir types - Google Patents
Dual-pressure-drop method for recognizing oil and gas well acid fracturing communication reservoir types Download PDFInfo
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- CN105678082A CN105678082A CN201610016417.6A CN201610016417A CN105678082A CN 105678082 A CN105678082 A CN 105678082A CN 201610016417 A CN201610016417 A CN 201610016417A CN 105678082 A CN105678082 A CN 105678082A
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- 239000002253 acid Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004891 communication Methods 0.000 title claims abstract description 6
- 238000010276 construction Methods 0.000 claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 57
- 238000011161 development Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 230000003068 static effect Effects 0.000 abstract description 7
- 230000018109 developmental process Effects 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229940069428 antacid Drugs 0.000 description 1
- 239000003159 antacid agent Substances 0.000 description 1
- 230000001458 anti-acid effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention provides a dual-pressure-drop method for recognizing oil and gas well acid fracturing communication reservoir types. The method includes the following steps that A, seismic data, drilling conditions, well logging interpretation, production performance analysis and other data are collected; B, a pressure-time curve graph in the acid fracturing construction process is drawn according to the data collected in the step A; C, construction pressure drop, pump stopping pressure and pump stopping pressure drop are obtained according to the pressure-time curve graph; D, the reservoir types, seismic features, well logging interpretation, construction pressure drop, pump stopping pressure and pump stopping pressure drop obtained in the steps are analyzed, and then the communication reservoir types are obtained. The basic conditions of reservoirs within the extension range of an artificial fracture are roughly judged according to the pressure-time curve in the acid fracturing construction process, the distribution condition of underground reservoir bodies can be accurately recognized and the growth features of fracture holes can be accurately evaluated through the combination of dynamic data and necessary static information, and therefore the purposes of deepening reservoir understanding and optimizing a reformation measure scheme are achieved.
Description
Technical field
The present invention relates to the technical field of oil-gas field development, link up double; two pressure decline methods of Reservoir type particularly to a kind of identification of hydrocarbon well acid fracturing.
Background technology
Main stream approach currently for the transformation of carbonate reservoir increasing yield of oil and natural gas is to implement acid fracturing construction: inject acid solution with the injection pressure higher than formation fracture pressure to stratum, acid solution and rock intrinsic fracture, man-made fracture wall react, form uneven groove, after acid fracturing construction terminates, crack closure, the uneven groove that acid fracturing is formed serves as the passage of oil gas flowing, reduces flow resistance, improves Oil & Gas Productivity.
Carbonate Reservoir complex geologic conditions, anisotropism is strong, Oil Reservoir Types is extremely special, its reservoir space type is grown more complete, mainly being made up of Karst Caves system, intrinsic fracture band and corrosion bore hole system, simultaneously different reservoir space type is interweaved and defines seam hole type Reservoir Body with different combining forms. Sum up the development characteristics of fracture and cave reservoir be summarised as Reservoir Body complex shape, not of uniform size, be distributed discontinuous, law of development and the feature such as controlled factordisease is inconspicuous. It is extremely difficult for relying on merely static data (data such as thin slice, rock core, well logging, physical prospecting) to recognize this kind of oil reservoir for this kind of oil reservoir, most of static informations can not represent the actual characteristic of subsurface deposit simultaneously, and the representativeness of sampling of conventional reservoir physical parameter is too low for our accurate assurance characteristics of reservoirs precision.
Difficulty in view of fracture and vug carbonate reservoir research, it is likely to have more representativeness than conventional little yardstick core data according to the dynamic data that Reservoir behavior information obtains, acid fracturing construction data, the extension state of the actual man-made fracture in underground can be reflected the most really, when working liquid capability and operational discharge capacity are constant, cause that the most direct factor that operation pressure changes is reservoir characteristics, it is possible to substantially judge the basic condition of reservoir in man-made fracture expanded range according to the construction curve in work progress. In addition in conjunction with the static information of well test data, Production development data and necessity just can be relatively accurate identification underground reservoir body distribution situation, evaluate the development characteristics of crack hole, to reach in-depth reservoir understanding and Optimizing Reconstruction measure scheme purpose.
In carbonate reservoir acid fracturing work progress, whether the construction parameter such as pump pressure, discharge capacity can press off along with man-made fracture, whether link up natural seam_cavern type and be varied from, it is also possible to directly reflect the truth on stratum.Acid fracturing construction curve can not only for judging acidizing treatment quality, analyze construction effect to provide foundation, moreover it is possible to judges reservoir characteristic and seam hole developmental state by the multi-aspect information analysis such as reservoir permeability, leak-off.
Acid fracturing process can be divided into four-stage, as shown in Figure 1, respectively squeeze the fracturing fluid stage, squeeze the acid solution stage, squeeze displacement fluid stage and termination of pumping pressure measurement depression of order section, in acid fracturing work progress, can be determined with the relation of displacement variation by pump pressure in acid fracturing construction curve and whether work progress link up to the favourable intrinsic fracture of reservoir, seam hole or cave; Wherein, the more low seam hole body scale showing that ditch leads to of termination of pumping pressure is more big; Termination of pumping pressure drop shows that more greatly around pit shaft, reservoir physical property is better.
The present invention is based on the pressure time curve in acid fracturing work progress, integrated survey construction pressure drop, termination of pumping pressure drop, and fine identification acid fracturing links up Reservoir type.
Summary of the invention
The technical problem to be solved is a kind of difficulty overcoming and utilizing static data identification carbonate complex rock Reservoir type, reaches double; two pressure decline methods of the purpose identification of hydrocarbon well acid fracturing communication Reservoir type finely identifying that Reservoir type is linked up in acid fracturing construction.
This invention address that above-mentioned technical problem be the technical scheme is that to comprise the following steps:
The data such as A, collection seismic data, drilling well situation, well log interpretation, Production development analysis;
B, according to the pressure-time diagram in the data plotting acid fracturing work progress collected in step A;
C, according to above-mentioned pressure-time diagram obtain construction pressure drop, termination of pumping pressure, termination of pumping pressure drop;
D, analyze above-mentioned steps obtain Reservoir type, seismic signature, well log interpretation, construction pressure drop, termination of pumping pressure, termination of pumping pressure drop, thus obtain link up Reservoir type.
In order to further finely identify acid fracturing link up Reservoir type, it is preferred that technical scheme is: analytical data in described step D and finely identify link up Reservoir type situation be:
(1) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 20MPa, termination of pumping pressure is less than 15.7MPa, when termination of pumping pressure drop is less than 3.8MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is large-scale solution cavity (cave type);
(2) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 18MPa, termination of pumping pressure is less than 16.6MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is medium-sized solution cavity (cave type);
(3) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 10MPa, termination of pumping pressure is less than 37.6MPa, when termination of pumping pressure drop is 0.5-2.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is filling-type Karst cave (cave type);
(4) when earthquake is characterized as strong reflection shape, well log interpretation is II, III class reservoir, construction pressure drop is less than 2MPa, termination of pumping pressure is more than 21MPa, when termination of pumping pressure drop is less than 4.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is microcrack small holes developmental pattern reservoir (fracture-vug);
(5) when earthquake is characterized as strong amplitude+beading, well log interpretation is II, III class reservoir, construction pressure drop is less than 10MPa, termination of pumping pressure is 6.2-37.7MPa, when termination of pumping pressure drop is 0-6.7MPa, the result obtained is Reservoir type is hole type+fracture-vug, and linking up reservoir situation is many seams hole developmental pattern reservoir (fracture-vug);
(6) mixed and disorderly reflection or strong reflection amplitude shape it are characterized as when earthquake, well log interpretation is II, III class reservoir, construction pressure drop is 0MPa, termination of pumping pressure is more than 30MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is hole type reservoir.
Beneficial effects of the present invention: the present invention overcomes and relies on merely static data data such as () thin slice, rock core, well logging, physical prospectings to recognize carbonate complex rock oil reservoir acid fracturing to link up the difficulty of Reservoir type; The basic condition of reservoir in man-made fracture expanded range is substantially judged according to the pressure time curve in acid fracturing work progress, in conjunction with the static information of dynamic data and necessity just can be relatively accurate identification underground reservoir body distribution situation, evaluate the development characteristics of crack hole, to reach in-depth reservoir understanding and Optimizing Reconstruction measure scheme purpose.
Accompanying drawing explanation
Fig. 1 is pressure time history plot in antacid pressure work progress;
Fig. 2 is pressure-time diagram in embodiment.
Detailed description of the invention
A kind of identification of hydrocarbon well acid fracturing of the present invention links up double; two pressure decline methods of Reservoir type, comprises the following steps: the data such as A, collection seismic data, drilling well situation, well log interpretation, Production development analysis; B, according to the pressure-time diagram in the data plotting acid fracturing work progress collected in step A; C, according to above-mentioned pressure-time diagram obtain construction pressure drop, termination of pumping pressure, termination of pumping pressure drop; D, analyze above-mentioned steps obtain Reservoir type, seismic signature, well log interpretation, construction pressure drop, termination of pumping pressure, termination of pumping pressure drop, thus obtain link up Reservoir type.
Above-mentioned steps A collects the data such as seismic data, drilling well situation, well log interpretation and Production development analysis, specifically includes the leakage in seismic exploration data, drilling process, drilling failure, whether bore Multilateral Wells, well log interpretation. Drawing the pressure time curve in acid fracturing work progress in described step B, namely draw pressure time history plot in acid fracturing work progress, this figure is as shown in Figure 1. The foundation analyzing situation in described step D is: when discharge capacity is constant, produces construction pressure drop and illustrates to link up favorable reservoir body, and pressure drop more big then favorable reservoir body of constructing is more big; During acid fracturing, man-made fracture may lead to, at crowded fracturing fluid initial stage, middle and late stage or crowded acid solution initial stage, middle and late stage inter-drain, the seam hole system that Reservoir Body is favourable, the different phase reaction Reservoir Body linked up and the distance of the spacing of pit shaft, link up more early to illustrate that Reservoir Body distance pit shaft is more near, otherwise then illustrate that Reservoir Body distance pit shaft is more remote; The more low seam hole body scale showing that ditch leads to of termination of pumping pressure is more big, and termination of pumping pressure drop shows that more greatly around pit shaft, reservoir physical property is better.
Concrete segmentation situation is: (1) is characterized as beading when earthquake, well log interpretation is II, III class reservoir, construction pressure drop is more than 20MPa, termination of pumping pressure is less than 15.7MPa, when termination of pumping pressure drop is less than 3.8MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is large-scale solution cavity (cave type);
(2) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 18MPa, termination of pumping pressure is less than 16.6MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is medium-sized solution cavity (cave type);
(3) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 10MPa, termination of pumping pressure is less than 37.6MPa, when termination of pumping pressure drop is 0.5-2.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is filling-type Karst cave (cave type);
(4) when earthquake is characterized as strong reflection shape, well log interpretation is II, III class reservoir, construction pressure drop is less than 2MPa, termination of pumping pressure is more than 21MPa, when termination of pumping pressure drop is less than 4.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is microcrack small holes developmental pattern reservoir (fracture-vug);
(5) when earthquake is characterized as strong amplitude+beading, well log interpretation is II, III class reservoir, construction pressure drop is less than 10MPa, termination of pumping pressure is 6.2-37.7MPa, when termination of pumping pressure drop is 0-6.7MPa, the result obtained is Reservoir type is hole type+fracture-vug, and linking up reservoir situation is many seams hole developmental pattern reservoir (fracture-vug);
(6) mixed and disorderly reflection or strong reflection amplitude shape it are characterized as when earthquake, well log interpretation is II, III class reservoir, construction pressure drop is 0MPa, termination of pumping pressure is more than 30MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is hole type reservoir.
Six kinds of situation forms of above-mentioned segmentation represent such as table 1
Table 1 acid fracturing links up the Reservoir type criteria for classifying
Below in conjunction with embodiment, the present invention will be further described in detail.
A present tight gas reservoir frac water horizontal well, first collects the data such as the seismic data of this well, drilling well situation, well log interpretation, Production development analysis. The seismic signature showing this well from seismic data is strong amplitude+beading pattern, drilling process does not occur drilling fluid leakage, drilling failure does not occur, do not bore Multilateral Wells, well log interpretation display reservoir is II, III class reservoir, then smooth from the known wellbore construction of above data, does not bore chance large-scale crack, solution cavity, do not bore chance water layer, implement acid fracturing construction and can improve oil-production capacity to a certain extent.
Then the pressure time curve in acid fracturing work progress is drawn; Pressure time curve as shown in Figure 2 is drawn according to the pressure data that acid fracturing work progress records.
And analyze the construction situation such as pressure drop, termination of pumping pressure drop, construction pressure drop is about 10MPa as can be seen from Figure 2, and termination of pumping pressure is about 30MPa, and termination of pumping pressure drop is about 0.2MPa.
Referring finally to table 1, it is known that it is hole type+fracture-vug that many seam holes are grown that Reservoir type is linked up in this time acid fracturing construction, produces construction pressure drop time earlier, illustrate that the effective Reservoir Body linked up distance pit shaft is had a contest closely.
Claims (2)
1. double; two pressure decline methods of an identification of hydrocarbon well acid fracturing communication Reservoir type, it is characterised in that comprise the following steps:
The data such as A, collection seismic data, drilling well situation, well log interpretation, Production development analysis;
B, according to the pressure-time diagram in the data plotting acid fracturing work progress collected in step A;
C, according to above-mentioned pressure-time diagram obtain construction pressure drop, termination of pumping pressure, termination of pumping pressure drop;
D, analyze above-mentioned steps obtain Reservoir type, seismic signature, well log interpretation, construction pressure drop, termination of pumping pressure, termination of pumping pressure drop, thus obtain link up Reservoir type.
2. a kind of identification of hydrocarbon well acid fracturing according to claim 1 link up Reservoir type double; two pressure decline methods, it is characterised in that analytical data in described step D and finely identify communication Reservoir type situation be:
(1) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 20MPa, termination of pumping pressure is less than 15.7MPa, when termination of pumping pressure drop is less than 3.8MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is large-scale solution cavity (cave type);
(2) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 18MPa, termination of pumping pressure is less than 16.6MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is medium-sized solution cavity (cave type);
(3) when earthquake is characterized as beading, well log interpretation is II, III class reservoir, construction pressure drop is more than 10MPa, termination of pumping pressure is less than 37.6MPa, when termination of pumping pressure drop is 0.5-2.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is filling-type Karst cave (cave type);
(4) when earthquake is characterized as strong reflection shape, well log interpretation is II, III class reservoir, construction pressure drop is less than 2MPa, termination of pumping pressure is more than 21MPa, when termination of pumping pressure drop is less than 4.2MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is microcrack small holes developmental pattern reservoir (fracture-vug);
(5) when earthquake is characterized as strong amplitude+beading, well log interpretation is II, III class reservoir, construction pressure drop is less than 10MPa, termination of pumping pressure is 6.2-37.7MPa, when termination of pumping pressure drop is 0-6.7MPa, the result obtained is Reservoir type is hole type+fracture-vug, and linking up reservoir situation is many seams hole developmental pattern reservoir (fracture-vug);
(6) mixed and disorderly reflection or strong reflection amplitude shape it are characterized as when earthquake, well log interpretation is II, III class reservoir, construction pressure drop is 0MPa, termination of pumping pressure is more than 30MPa, when termination of pumping pressure drop is less than 3.3MPa, the result obtained is Reservoir type is fracture-vug, and linking up reservoir situation is hole type reservoir.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107083939A (en) * | 2017-06-26 | 2017-08-22 | 中国石油化工股份有限公司 | Three-dimensional development method for the disconnected solution oil reservoir of carbonate rock |
| CN107191175A (en) * | 2017-07-11 | 2017-09-22 | 中国石油化工股份有限公司 | Flooding pattern construction method for the disconnected solution oil reservoir of carbonate rock |
| CN110792436A (en) * | 2018-08-02 | 2020-02-14 | 中国石油天然气股份有限公司 | Method and device for determining carbonate reservoir type |
| CN112483064A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Method, device and equipment for determining well arrangement mode of condensate gas reservoir and storage medium |
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- 2016-01-12 CN CN201610016417.6A patent/CN105678082B/en not_active Expired - Fee Related
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| CN103902827A (en) * | 2014-04-03 | 2014-07-02 | 刘鑫 | Flow unit division method of carbonate-rock horizontal wells |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083939A (en) * | 2017-06-26 | 2017-08-22 | 中国石油化工股份有限公司 | Three-dimensional development method for the disconnected solution oil reservoir of carbonate rock |
| CN107191175A (en) * | 2017-07-11 | 2017-09-22 | 中国石油化工股份有限公司 | Flooding pattern construction method for the disconnected solution oil reservoir of carbonate rock |
| CN110792436A (en) * | 2018-08-02 | 2020-02-14 | 中国石油天然气股份有限公司 | Method and device for determining carbonate reservoir type |
| CN112483064A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Method, device and equipment for determining well arrangement mode of condensate gas reservoir and storage medium |
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