CN112983359B - Thin interbed oil field development method - Google Patents
Thin interbed oil field development method Download PDFInfo
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- CN112983359B CN112983359B CN202110211214.3A CN202110211214A CN112983359B CN 112983359 B CN112983359 B CN 112983359B CN 202110211214 A CN202110211214 A CN 202110211214A CN 112983359 B CN112983359 B CN 112983359B
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- 238000011161 development Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000011440 grout Substances 0.000 claims abstract description 9
- 238000002474 experimental method Methods 0.000 claims abstract description 4
- 208000035126 Facies Diseases 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000007569 slipcasting Methods 0.000 claims description 7
- 239000003208 petroleum Substances 0.000 abstract description 11
- 238000011084 recovery Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 22
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
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Classifications
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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
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- 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
- E21B7/00—Special methods or apparatus for drilling
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a thin interbed oilfield development method, which comprises the steps of measuring and obtaining detailed data of a thin interbed horizon structure; preparing a thin interbed sample with the same mechanical property as the thin interbed according to the data condition of the thin interbed; performing a fracturing experiment on the thin interbed sample to obtain the expected fracturing fracture condition of the thin interbed; designing drilling point positions according to the fracturing fracture conditions; drilling according to the designed drilling point positions; inserting a development pipe into the well after the well drilling is finished; grouting the inserted development pipe, and starting oil field exploitation after the grout is solidified. The method is characterized in that the detailed pre-judgment is carried out on the fracturing fracture condition of the thin interbed in advance, the optimal drilling point is determined, the corresponding drilling point can communicate a larger amount of petroleum through the fracture as far as possible, meanwhile, the pipeline can be stretched into a deeper layer through the extension of the development pipe, the petroleum can be collected more widely, the recovery ratio of the petroleum is improved, and the better oil recovery effect and the oil recovery efficiency are obtained.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a thin interbed oilfield development method.
Background
In a shale oil reservoir, the shale oil reservoir with rock mass characteristics expressed as multi-rhythm is called a thin interbed, and as oil exploration and development go deep, a large number of distributed thin interbed reservoirs gradually become important resources for oil yield increase. Interbed refers to the repeated appearance of two rock layers, indicating repeated, repetitive changes in the depositional environment. The thin interbed reservoir usually has the characteristics that thick sandstone reservoirs and thin shale interbed alternately appear in the longitudinal direction, and the reservoir presents the characteristics that sand layers and mud layers alternately develop and have different thicknesses in the longitudinal direction.
The oil field with thin interbed development has thin single layer, more layers and large longitudinal span, and can be effectively developed by adopting a conventional development mode, the development effect is not ideal, and the recovery ratio is low.
Disclosure of Invention
The invention aims to provide a thin interbed oil field development method to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a thin interbed oilfield development method, comprising the steps of:
firstly, measuring and acquiring detailed data of a thin interbed horizon structure;
secondly, preparing a thin interbed sample with the same mechanical property as the thin interbed according to the thin interbed data condition obtained in the first step;
thirdly, performing a fracturing experiment on the thin interbed sample obtained in the second step to obtain the expected fracturing crack condition of the thin interbed;
fourthly, designing drilling point positions according to the fracturing fracture conditions in the third step;
fifthly, drilling according to the drilling point positions designed in the fourth step;
sixthly, inserting a development pipe into the well drilling after the well drilling is finished;
and seventhly, grouting the development pipe inserted in the sixth step, and starting oil field exploitation after the grout is solidified.
As a further scheme of the invention: the detailed data obtaining mode of the thin interbed horizon structure in the first step comprises the following steps: firstly, determining the logging layering depth and the well facies characteristics through lithology and logging curves, secondly, processing related data by using a computer, judging the polarity of a thin interbed section according to the processed data and the geological characteristics of the area where the thin interbed is located, and thirdly, acquiring detailed thin interbed layer position mechanism data by combining the judged result and the seismic facies characteristics of the thin interbed and using a secondary calibration method.
As a further scheme of the invention: and when the thin interbed sample in the second step is prepared, firstly, collecting core debris of the thin interbed, secondly, crushing the collected core debris to prepare core powder, and thirdly, pressing the core powder under the conditions of thin interbed temperature and stress according to the obtained thin interbed data to obtain the thin interbed sample.
As a further scheme of the invention: and after the condition of the fracturing fracture in the third step is obtained, processing the fracturing fracture through a computer, introducing the corresponding fracturing fracture condition into a corresponding three-dimensional space model, and selecting a drilling point position according to the condition displayed by the three-dimensional space model.
As a further scheme of the invention: the development pipe in the sixth step includes and is responsible for and the outer tube, the outer tube sets up in the outside of being responsible for and realizes connecting through supporting the connecting rib, forms the slip casting passageway between being responsible for and the outer tube, connects a plurality of flexible pipes on being responsible for, and the flexible pipe includes two-layerly, and the inlayer and the person in charge intercommunication of flexible pipe, the skin and the outer tube intercommunication of flexible pipe form the passageway that is linked together with the slip casting passageway between the inlayer and the skin of flexible pipe and the terminal inlayer and the skin closure of flexible pipe.
As a further scheme of the invention: the closed part of the inner layer and the outer layer at the tail end of the flexible pipe is provided with a plurality of air exhaust holes for exhausting air.
As a further scheme of the invention: the support connecting ribs are cylindrical rod pieces, and two ends of each cylindrical rod piece are respectively connected with the outer sleeve and the main pipe.
Compared with the prior art, the invention has the beneficial effects that:
the method determines the optimal drilling point by pre-judging the fracturing crack condition of the thin interbed in advance, so that the corresponding drilling point can communicate a larger amount of petroleum through the crack as far as possible, and meanwhile, the pipeline can extend into a deeper layer through the extension and fixation of the development pipe, so that the petroleum can be more widely collected, the recovery ratio of the petroleum is improved, and the better oil recovery effect and oil recovery efficiency are obtained.
Drawings
FIG. 1 is a schematic diagram of a development pipe configuration for a thin interbed oilfield development process.
Fig. 2 is a schematic structural diagram of a development pipe in a use state in a thin interbed oilfield development method.
FIG. 3 is a schematic view of the connection structure of the main pipe and the outer casing pipe in the thin interbed oil field development method.
In the figure: 1-outer sleeve, 2-main pipe, 3-grouting channel, 4-flexible pipe and 5-supporting connecting rib.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-3, a method for developing a thin interbed oil field includes the following steps:
firstly, measuring and acquiring detailed data of a thin interbed horizon structure;
secondly, preparing a thin interbed sample with the same mechanical property as the thin interbed according to the thin interbed data condition obtained in the first step;
thirdly, performing a fracturing experiment on the thin interbed sample obtained in the second step to obtain the expected fracturing crack condition of the thin interbed;
fourthly, designing drilling point positions according to the fracturing fracture conditions in the third step;
fifthly, drilling according to the drilling point positions designed in the fourth step;
sixthly, inserting a development pipe into the well drilling after the well drilling is finished;
and seventhly, grouting the development pipe inserted in the sixth step, and starting oil field exploitation after the grout is solidified.
The detailed data obtaining mode of the thin interbed horizon structure in the first step comprises the following steps: firstly, determining the logging layered depth and the logging facies characteristics through the lithology and the logging curve, and determining the logging layered depth and the logging facies characteristics of a thin interbed through the lithology and the logging facies curve characteristics in a lithology and logging facies mode; secondly, processing related data by using a computer, judging the polarity of the section of the thin interbed according to the processed data and the geological characteristics of the area where the thin interbed is located, wherein when judging, a common lithosomal needs to be combined with a seismic wavelet polarity judgment method, and a special lithosomal area judges the related polarity according to the mode of combining special seismic response and seismic wavelet polarity judgment; thirdly, the detailed thin interbed layer position mechanism data is obtained by combining the judged result with the seismic facies characteristics of the thin interbed layer and utilizing a secondary calibration rule, and the fine measurement of the whole well section is completed by combining the well positions of the long well section and the multi-target layer while utilizing the secondary calibration rule.
And when the thin interbed sample in the second step is prepared, firstly, collecting core debris of the thin interbed, secondly, crushing the collected core debris to prepare core powder, limiting the size of the core powder to be less than 100 meshes when the core powder is crushed, thirdly, pressing the core powder under the conditions of thin interbed temperature and stress according to the obtained thin interbed data to obtain the thin interbed sample, and when the thin interbed sample is obtained, not only the temperature and stress conditions but also the corresponding layer number and layer thickness are considered for corresponding treatment.
After the condition of the fracturing fracture in the third step is obtained, processing the fracturing fracture through a computer, introducing the corresponding fracturing fracture condition into a corresponding three-dimensional space model, selecting a drilling point position according to the condition displayed by the three-dimensional space model, obtaining the three-dimensional space model, and obtaining point cloud data by adopting three-dimensional scanning, wherein the point cloud data can be collected by adopting an I-Site8200ER three-dimensional laser scanner produced by Australian MAPTEKE company; the scanner has the maximum measuring range of 500m and the angle measuring range of 10 seconds, integrates a high-resolution panoramic camera, and can synchronously obtain texture information accurately matched with point cloud data. The scanner has the characteristic of small system volume, light weight, high integration level, convenient carrying, high precision, convenient acceptance check, automatic splicing, real data and the like; and the point cloud data is imported into a 3ds Max for processing by processing the point cloud data, and the software has the advantages of concise and intuitive operation interface, intuitive and powerful view function, high design efficiency and the like.
The development pipe in the sixth step is including being responsible for 2 and outer tube 1, outer tube 1 sets up and realizes connecting in the outside of being responsible for 2 and through supporting connecting rib 5, forms slip casting passageway 3 between being responsible for 2 and outer tube 1, connects a plurality of flexible tubes 4 on being responsible for 2, and flexible tube 4 is two-layer, and the inlayer of flexible tube 4 and being responsible for 2 intercommunication, the skin and the outer tube 1 intercommunication of flexible tube 4 form the passageway that is linked together with the slip casting passageway and the terminal inlayer and the skin closure of flexible tube between the inlayer and the skin of flexible tube 4.
In practical use, after the development pipe is inserted into a well, the flexible pipe 4 is attached to the outer side surface of the outer casing 1 because the flexible pipe is flexible, so that the normal insertion of the development pipe cannot be influenced; after the development pipe is inserted to a preset position, grout is injected into the top of the development pipe through a grouting channel 3 between a main pipe 2 and an outer sleeve 1 on the development pipe, the grout can move downwards along the grouting channel 3 and is injected into the space between the inner layer and the outer layer of a flexible pipe 4, at the moment, the grout is continuously injected into the grouting channel 3 through the top of the development pipe and is properly pressurized, the flexible pipe 4 stretches out towards two sides through the support of the grout and pressure, can extend to the deep part of a thin interbed, the grouting is stopped after the flexible pipe extends to a certain state, the top of the grouting channel 3 is sealed, after the grout is completely solidified, a channel capable of flowing liquid is formed inside the development pipe and the expanded flexible pipe 4, namely a channel for oil exploitation, so that the development of the thin interbed oil can be realized, and the flexible pipe 4 under the condition can be deeply inserted into different layer gaps, therefore, the development of multilayer petroleum can be realized through the development pipe, and the development efficiency can be ensured.
The inner layer and the outer closed position at the tail end of the flexible pipe 4 are provided with a plurality of air exhaust holes, and the air exhaust holes are arranged to avoid that gas between the inner layer and the outer layer of the grouting channel 3 and the flexible pipe 4 is not timely exhausted to cause gas accumulation at the tail end of the flexible pipe during grouting, so that adverse effects are caused on later-stage oil exploitation.
In fact, when using, in order to further increase the efficiency that flexible pipe 4 gathered oil, can also set up a lot of pipelines that run through flexible pipe 4 on flexible pipe 4, these pipelines run through the inlayer and the skin of flexible pipe 4, can directly be linked together the inside passageway of flexible pipe and the outside petroleum layer of flexible pipe 4, and the convenience is to the collection of oil, increases the efficiency of gathering.
The method is characterized in that the detailed pre-judgment is carried out on the fracturing fracture condition of the thin interbed in advance, the optimal drilling point is determined, the corresponding drilling point can communicate a larger amount of petroleum through the fracture as far as possible, meanwhile, the pipeline can be stretched into a deeper layer through the extension of the development pipe, the petroleum can be collected more widely, the recovery ratio of the petroleum is improved, and the better oil recovery effect and the oil recovery efficiency are obtained.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (6)
1. A thin interbed oilfield development method, comprising the steps of:
firstly, measuring and acquiring detailed data of a thin interbed horizon structure;
secondly, preparing a thin interbed sample with the same mechanical property as the thin interbed according to the thin interbed data condition obtained in the first step;
thirdly, performing a fracturing experiment on the thin interbed sample obtained in the second step to obtain the expected fracturing crack condition of the thin interbed;
fourthly, designing drilling point positions according to the fracturing fracture conditions in the third step;
fifthly, drilling according to the drilling point positions designed in the fourth step;
sixthly, inserting a development pipe into the well drilling after the well drilling is finished;
seventhly, grouting the development pipe inserted in the sixth step, and starting oil field exploitation after the grout is solidified;
development pipe in the sixth step is including being responsible for (2) and outer tube (1), outer tube (1) sets up in the outside of being responsible for (2) and realizes connecting through supporting connecting rib (5), forms slip casting passageway (3) between being responsible for (2) and outer tube (1), connect a plurality of flexible tubes (4) on being responsible for (2), flexible tube (4) are including two-layer, the inlayer and the person in charge (2) intercommunication of flexible tube (4), the skin and outer tube (1) intercommunication of flexible tube (4), it is closed with the terminal inlayer and the skin of flexible tube to form the passageway that is linked together with the slip casting passageway between the inlayer and the skin of flexible tube (4).
2. The thin interbed oilfield development method of claim 1, wherein the detailed data acquisition of the thin interbed horizon structure in the first step comprises: firstly, determining the logging layering depth and the well facies characteristics through lithology and logging curves, secondly, processing related data by using a computer, judging the polarity of a thin interbed section according to the processed data and the geological characteristics of the area where the thin interbed is located, and thirdly, acquiring detailed thin interbed layer position mechanism data by combining the judged result and the seismic facies characteristics of the thin interbed and using a secondary calibration method.
3. The thin interbed oilfield development method of claim 2, wherein the thin interbed sample in the second step is prepared by first collecting core debris of the thin interbed, then crushing the collected core debris to form core powder, and then pressing the obtained thin interbed data pair under conditions of thin interbed temperature and stress to obtain the thin interbed sample.
4. The thin interbed oilfield development method of claim 3, wherein after the fracture conditions in the third step are obtained, the fracture conditions are processed by a computer and introduced into a corresponding three-dimensional space model, and drilling point locations are selected according to the conditions exhibited by the three-dimensional space model.
5. A thin interbed oilfield development method according to any one of claims 1 to 4, wherein the flexible pipe (4) is provided with a plurality of air vent holes at the closed positions of the inner layer and the outer layer of the end.
6. The thin interbed oilfield development method according to claim 5, wherein the support connection ribs (5) are cylindrical rod members, and both ends of the cylindrical rod members are connected to the outer casing pipe (1) and the main pipe (2), respectively.
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