CN113417620B - Method and device for preventing sand in permeable layer of weak cementation sandstone layer of heavy oil thermal production well - Google Patents
Method and device for preventing sand in permeable layer of weak cementation sandstone layer of heavy oil thermal production well Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to the technical field of petroleum drilling and production, in particular to a permeable reinforcing sand control method and device for a weak cementation sandstone layer of a heavy oil thermal production well. The method comprises the following steps: obtaining a geological sample of the weakly cemented sandstone layer; determining physical and chemical parameters of the weakly cemented sandstone layer according to the obtained geological sample; determining the particle size of a high-permeability proppant for fracturing and curing of the weakly cemented sandstone layer according to the particle size distribution of the sand grains; designing the geometrical morphology of the fracture according to the Young modulus, tensile strength and compressive strength parameters of the stratum, and determining fracturing curing construction parameters; and performing fracturing curing construction on the weakly cemented sandstone layer according to the particle size of the high-permeability propping agent and fracturing curing construction parameters. According to the invention, the stratum fracturing technology and the permeable solidification technology are combined, the high-permeability propping agent is added into the permeable base slurry to form a permeable solidification liquid system, the rheological property of the permeable solidification liquid is adjusted and used as stratum fracturing hydraulic pressure for stratum exploitation, and the sand production problem of a heavy oil thermal production well is effectively avoided.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production, in particular to a permeable reinforcing sand control method and device for a weak cementing sand stratum of a heavy oil thermal production well.
Background
China is the fourth major heavy oil producing country in the world, and heavy oil resources are distributed in each large oil field in China. Unlike conventional petroleum resources, oil reservoirs are mostly weakly cemented sandstone layers and are developed using steam flooding or steam flooding methods. Therefore, the heavy oil reservoir production process is often accompanied with a serious sand production problem, so that a series of problems such as shaft lifting equipment abrasion, sand burying of a reservoir and the like are caused, the pump detection period of an oil well is prolonged, and the yield of the oil well is reduced.
Firstly, most of the thick oil reservoirs are medium and high permeability weak cementation sandstone layers, the cementation and cementation types are mainly argillaceous point contact cementation, and the porosity is generally between 24% and 34%. The porous and point contact characteristics result in the weak cementation sandstone stratum with low strength, and sand grains are easy to peel off from a rock framework under the combined action of formation pressure and fluid scouring. Secondly, the domestic oil field generally adopts thermal recovery modes such as high-temperature steam huff and puff, and in the thermal recovery process, the hydration expansion effect of high-temperature high-pressure steam can further damage the cementite among reservoir rock particles and reduce the rock strength of the reservoir. When the scouring and drag forces of the fluid on the reservoir exceed the tensile strength of the rock, formation sand is stripped from the rock framework and transported downhole. Moreover, the viscosity of the thick oil is high, and the drag force generated in the flowing process is large, so that the thick oil reservoir can be damaged. Compared with conventional petroleum, the thickened oil also has stronger sand carrying capacity and can carry more formation sand to the bottom of an oil well.
At present, the sand control of oil and gas wells can be mainly divided into three types, namely mechanical sand control, chemical sand control and composite sand control. The mechanical sand control is to form a sand control barrier by using an underground sand control pipe column or manually filling gravel, and the chemical sand control is to form a sand control barrier by mainly using a chemical cementing agent to cement formation sand. Composite sand control is a combination of the two. However, the sand control methods have the problems of damaging the formation permeability, short sand control period and the like.
In order to better solve the problem of sand production of the thickened oil, scientific research personnel provide novel sand prevention methods such as fracturing filling sand prevention, fiber composite sand prevention and the like. The principle of fracturing sand control is to form short and wide high-diversion cracks in the stratum through artificial fracturing, so that the flow resistance is reduced, and the productivity is improved. And gravel is filled in the cracks to form the artificial well wall with the multi-stage separation and filtration functions. Although the method can effectively improve the permeability of the stratum, the filled sand grains are often accompanied with the flowback of produced fluid of the oil reservoir to cause the failure of the sand prevention well wall because the conglutination of the accumulated sand in the cracks is weak. Therefore, the sand prevention problem of the weakly consolidated sandstone layer of the heavy oil thermal production well is still a key problem to be solved urgently in the field of oil and gas wells.
Disclosure of Invention
The invention provides a permeable reinforced sand control method and device for a weak cementation sandstone layer, and aims to solve the problem of sand production of the weak cementation sandstone layer of a heavy oil thermal production well and further improve the productivity of a heavy oil production well.
In one aspect, the invention provides an in-situ consolidation method for a weak cementation sandstone layer of a heavy oil thermal production well, which comprises the following steps:
(1) Obtaining a geological sample of the weakly cemented sandstone layer;
(2) Determining physical and chemical parameters of the weakly cemented sandstone layer according to the obtained geological sample; the physicochemical parameters include, but are not limited to, temperature, sand particle size distribution, rock mineral composition, young's modulus, poisson's ratio, formation tensile strength, compressive strength, permeability;
(3) Determining the particle size of a high permeability proppant for fracturing and curing the weakly cemented sandstone layer according to the particle size distribution of the sand grains;
(4) Designing the geometrical morphology of the fracture according to the Young modulus, tensile strength and compressive strength parameters of the stratum, and determining fracturing curing construction parameters; the fracturing curing construction parameters comprise injection time, injection pressure, injection pre-liquid volume and injection curing liquid slurry volume;
(5) And performing fracturing curing construction on the weakly cemented sandstone layer according to the particle size of the high-permeability proppant and fracturing curing construction parameters.
Optionally, in step (5), the implementing fracture curing on the weakly consolidated sandstone layer according to the particle size of the curing material and the fracture curing construction parameters includes:
(5-1) selecting a proper support material according to the particle size of the high-permeability proppant. The support material is a solid-phase material which has a porous structure and can bear a high-temperature and high-pressure environment;
(5-2) preparing stratum solidifying liquid base slurry with proper viscosity, water loss rate and solidifying time according to the temperature, rock mineral components, young modulus and permeability parameters;
(5-3) mixing the support material with the stratum solidification liquid base slurry to prepare a stratum solidification working solution; the rheological property of the stratum curing working fluid is determined according to the temperature of the weakly cemented sandstone layer and the fracturing construction requirements, and the stratum curing working fluid still needs to ensure certain compressive strength and tensile strength at 300-350 ℃;
(5-4) performing fracturing construction by using the stratum solidifying liquid base slurry with the injected slurry volume according to the injection time and the injection pressure, and fracturing stratum fractures;
(5-5) after the crack is formed, injecting the prepared stratum curing working fluid into the stratum, stopping injecting after the crack is fully developed, and closing the well to wait for the formation curing fluid to be cured to form a seepage channel.
Optionally, step (2) includes:
(2-1) measuring the temperature of the stratum at the target layer position in a logging mode;
(2-2) determining the sand grain size distribution of the dried geological sample by adopting a method combining a screening method and a laser particle size analyzer test method;
(2-3) analyzing the mineral components of the rock by using an infrared spectrum method;
(2-4) testing the Young modulus, poisson's ratio, compressive strength and tensile strength of the rock sample by using a triaxial compression testing machine;
and (2-5) testing the permeability of the rock sample by using a liquid permeability tester.
Optionally, determining the particle size of the high permeability proppant for the fracturing and curing construction of the weakly cemented sandstone layer by using a one-third bridging theory in the step (3) according to a distribution curve of the sand particle sizes of the geological sample; adjusting the volume fraction of the high-permeability proppant in the curing working fluid according to the fluid absorption capacity of the stratum and the geometric dimension of the fracture;
optionally, designing the fracture geometry according to the parameters of the young's modulus, the tensile strength, the compressive strength, and the like of the formation in the step (4), includes:
(4-1) determining the fracturing construction displacement Q;
(4-2) determining the optimal fracture length according to the parameters of the stratum such as tensile strength, compressive strength and the like;
and (4-3) calculating the fracture volume according to the seam width, the seam length and the seam height.
In another aspect, the present invention also provides a fracturing construction device for a weakly cemented sandstone layer of a heavy oil thermal production well, the device comprising:
the acquisition module is used for acquiring a geological sample of the weakly cemented sandstone layer;
the first determining module is used for determining the temperature, sand grain size distribution, rock mineral composition, young modulus, poisson's ratio, tensile strength, compressive strength and permeability parameters of the weakly consolidated formation according to the geological sample;
the second determination module is used for designing the geometrical form of the fracture according to the Young modulus, tensile strength and compressive strength of the stratum;
the third determination module is used for determining the particle size and the fracturing curing construction parameters of the fracturing curing high-permeability propping agent for the weakly cemented sandstone layer according to the sand particle size and the fracture geometric form, wherein the fracturing curing construction parameters comprise injection time, injection pressure and the total amount of injected permeable curing working fluid;
and the processing module is used for realizing stratum fracturing solidification on the weakly cemented sandstone layer according to the particle size of the high-permeability propping agent and the fracturing construction parameters.
Optionally, the processing module specifically includes:
the first processing submodule selects a proper proppant material according to the particle size of the high-permeability proppant;
the first manufacturing submodule is used for mixing the proppant material with permeable curing liquid base slurry to manufacture stratum curing working fluid with certain curing slurry viscosity, wherein the curing slurry viscosity is determined according to the fracturing construction requirement of the weakly cemented sandstone layer;
the first fracturing submodule is used for injecting the curing working fluid of the total amount of the weakly cemented sandstone layer curing fluid into a shaft and pressing open the stratum according to the injection time and the injection pressure, and closing the shaft and waiting for setting after the injection is finished;
optionally, the first determining module includes:
the first determining submodule is used for determining the sand grain size of the dried geological sample by adopting a method of combining a screening method and a laser particle size analyzer testing method;
the second determination submodule analyzes the rock mineral composition by using an infrared spectrum method;
the third determining submodule is used for testing the Young modulus, poisson ratio, compressive strength and tensile strength of the rock sample by using a triaxial compression testing machine;
a fourth determining submodule for testing the permeability of the rock sample by using a liquid permeability tester;
and the fifth determining submodule acquires the ground temperature data by using a well temperature logging mode.
Optionally, the second determining module is specifically configured to: designing the geometrical morphology of the fracture according to the Young modulus, tensile strength, compressive strength and other parameters of the stratum;
and according to the parameters of the Young modulus, the tensile strength, the compressive strength and the like of the stratum, aiming at reinforcing the minimum thickness and the optimal flow conductivity of a stratum ribbed plate, and designing the length and the width of the crack by utilizing finite element simulation software.
Optionally, the third determining module is specifically configured to:
determining the volume of the fracture according to the geometrical parameters of the stratum fracture, and determining the total amount of injected stratum solidification working fluid by combining the stratum fluid absorption capacity;
determining the particle size of a high permeability proppant for cementing the weakly cemented stratum according to a distribution curve of the sand particle size of the geological sample by adopting a 'one-third bridging' theory;
determining a support material for the weakly cemented sandstone layer according to the particle size of the high permeability proppant;
and determining formation fracturing construction parameters according to the actual working conditions, wherein the fracturing construction parameters comprise injection time, injection pressure and the total amount of injected permeable curing liquid.
According to the permeable fracturing sand control method for the weakly consolidated sandstone layer, provided by the invention, after a geological sample of the weakly consolidated sandstone layer is obtained, the particle size of a high-permeability propping agent for fracturing solidification is determined according to a 'one-third bridging' theory according to the particle size distribution of sandstone, and the formation fracture parameters are designed according to the compressive strength and the tensile strength of the formation, so that the permeable fracturing solidification sand control is realized for the weakly consolidated sandstone layer of the heavy oil thermal production well. The invention provides a fracturing sand control method for weakly consolidated sandstone layers, which combines a stratum fracturing technology with a permeable solidification technology, and adds a high-permeability proppant (high-permeability microspheres) into permeable base slurry to form a permeable solidification liquid system. And adjusting the rheological property of the permeable solidification liquid and using the permeable solidification liquid as a stratum fracturing fluid for fracturing and opening the stratum. After the base slurry is completely solidified, the permeable solidification liquid can form a seepage channel with high permeability in the pressed formation fracture. In addition, the solidified body also has higher compressive strength, and can effectively support the pressed formation fractures and avoid the reclosure of the formation fractures. Because the high-permeability material used as the propping agent is solidified by the base slurry and cannot be discharged along with the washing of formation fluid, the sand production problem of the heavy oil thermal production well is effectively avoided.
Drawings
FIG. 1 is a schematic flow chart of a permeable fracturing sand control method for weakly cemented sandstone formations, provided in example 1 of the present invention;
FIG. 2 is a comparison graph of permeable stratum consolidation sand control method and traditional fracturing sand control effect provided by the embodiment 1 of the invention;
FIG. 3 is a schematic diagram of a fracture set sand control device for weakly cemented sandstone formations as provided in example 2 of the present invention;
FIG. 4 is a schematic view of a treatment module of a fracture consolidation sand control device for weakly cemented sandstone formations provided in example 2 of the present invention;
FIG. 5 is a schematic diagram of a first identified module of a fracture consolidation sand control device for weakly cemented sand formations as provided in example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The permeable sand control method in the stratum for the weakly consolidated sandstone layer provided by the embodiment 1 of the invention can be executed by a terminal device. The terminal equipment of the embodiment of the invention can be personal computers, tablet computers, notebook computers, servers and other terminal equipment.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Example 1
As shown in fig. 1, the permeable fracturing sand control method for weakly cemented sandstone formations provided by the embodiment of the invention comprises the following steps:
step S101: obtaining geological samples of weakly cemented sandstone layers
Specifically, a geological sample of the sandstone interval needing to be solidified can be obtained through geological exploration and other methods. By way of example, a geological sample of the target interval may be obtained by drilling a core over the target interval. The embodiments of the present invention are not limited thereto, and those skilled in the art can refer to the prior art.
Step S102: and determining parameters such as temperature, sand grain size distribution, rock mineral composition, young modulus, poisson's ratio, stratum tensile strength, compressive strength, permeability and the like of the weakly cemented sandstone layer according to the obtained geological sample.
Specifically, after a geological sample is obtained, sand grains in the sandstone layer are untwisted, the grain size distribution of the sand grains in the sample is measured by a laser particle sizer, and rock components in the sandstone are measured by infrared spectroscopy.
Further, a standard rock sample of phi 25 multiplied by 50mm is drilled by a core drill bit, and the actual length L and the actual diameter R of the core are measured. And carrying out compression test by using the universal compression testing machine and the corresponding displacement sensor. And acquiring the axial deformation delta L and the radial deformation delta R in the elastic deformation range of the rock core by using a displacement sensor. After the compression test data is obtained, a section of straight line in the compression process is taken, and the length change quantity delta L and the cross-sectional area change quantity delta A before and after compression are calculated. The young's modulus E is calculated as follows:
wherein A is the cross-sectional area of the rock core before the compression test, and the calculation formula is as follows:
the Poisson ratio v calculation formula of the rock is as follows:
and (4) preparing a cylindrical standard core again, and measuring the actual length L of the core. It was placed into the core holder. And introducing fluid with certain pressure into one end of the core holder, and measuring the pressure difference delta P between a liquid inlet and a liquid outlet of the discharged fluid mass at the other end of the core holder. The viscosity μ of the liquid was measured using a viscometer. A curve excluding the change in fluid mass over time is obtained. Similarly, the volume flow rate Q of water is calculated by taking a stable straight line segment.Liquid permeability K of core w Comprises the following steps:
step S103: and determining the particle size of the high-permeability proppant for fracturing and curing the weakly cemented sandstone layer according to the particle size distribution of the sand particles.
And determining the optimal solid phase particle size according to the sand grain size distribution and a 'one-third bridging' theory so as to ensure that the solid phase permeable material still has certain sand control capability under the uncured condition.
Step S104: designing the geometrical form of the fracture according to the Young modulus, tensile strength and compressive strength parameters of the stratum, and determining the fracturing curing construction parameters; wherein the construction parameters comprise injection time, injection pressure and total amount of injected curing liquid.
First, the fracture construction displacement Q is determined. Fracturing construction requires that the fracturing fluid can be set to high pressure at the bottom of a well, so that the construction displacement should exceed the liquid absorption capacity of a stratum. On the premise that equipment is allowed and safe, the discharge capacity of the fracturing fluid is increased as much as possible to obtain wider cracks.
Further, determining the optimal fracture length according to the parameters of the stratum such as tensile strength, compressive strength and the like. And determining the fracturing fluid amount and the sand ratio through fracture extension simulation by taking the optimal fracture length and the optimal fracture conductivity as targets. The well mouth construction pressure p is the sum of the static fluid column pressure of the well bore, the friction resistance of the oil pipe part in the fracturing pipe column and the flow friction resistance of the fracturing fluid of the sleeve pipe part in the fracturing pipe column.
Further, the fracturing construction power P is as follows:
P＝16.67pQ
and finally, calculating the fracture volume according to the fracture width, the fracture length and the fracture height, wherein the volume is the volume V of the injected curing liquid, and the fracturing construction time t is as follows:
step S105: and carrying out stratum solidification construction on the weakly consolidated sandstone layer according to the particle size of the stratum solidification liquid and the stratum fracturing solidification construction parameters.
Specifically, according to the determined phase particle diameter of the formation solidification liquid, selecting appropriate high-permeability microspheres, and mixing the high-permeability microspheres with the formation solidification liquid base slurry to prepare the formation solidification working liquid with a certain viscosity, wherein the viscosity of the solidification working liquid is determined by formation fracturing construction, and is specifically set according to the specific condition of the weakly consolidated sandstone layer, which is not limited in the embodiment of the invention.
And according to the fracturing construction parameters in the step S104, injecting fracturing fluid pad fluid into the stratum according to the injection time and the injection pressure, and fracturing the stratum fractures. And after the crack is formed, injecting the prepared stratum curing working fluid into the stratum, stopping injecting after the crack is fully developed, closing the well and waiting for the solidification of the stratum curing fluid to form a seepage channel.
An example of a weakly cemented sandstone formation cured by a permeable solidification method according to embodiments of the invention is shown in part in fig. 2B. And after the permeable and cured weakly cemented sandstone layer is cured, the formation curing fluid base slurry is cured to form a cemented fixed high-permeability proppant with a certain permeability. The cementing substance and the high-permeability proppant jointly form a high-permeability channel so as to ensure the normal flow of the formation crude oil in the process of thick oil recovery. Compared with natural accumulation of proppant in the conventional fracturing sand control, as shown in fig. 2A, the permeable cementing material is used for solidifying the high-permeability material in the permeable layer, so that the yield of free sand is reduced on the premise of ensuring the permeability, and the problems of sand bank collapse and the like easily occurring in the later stage of the conventional fracturing sand control are effectively prevented.
According to the method for preventing sand by in-zone consolidation of the weakly consolidated sandstone stratum, provided by the embodiment 1 of the invention, the stratum pressure is combined with the artificial gravel packing sand prevention, and the permeable base slurry is used for solidifying the high-permeability proppant in the stratum, so that a seepage fracture with certain permeability and strength is formed in the stratum. Meanwhile, the high-permeability proppant is solidified by the solidified working fluid base slurry, so that the integral tensile strength of the proppant is ensured, and the stability of the sand bank in the later-stage mining process is further ensured.
Example 2
As shown in fig. 3, the cementing device for weakly cemented sandstone layers provided in embodiment 2 of the present invention is used in a terminal device, which may be a personal computer, a tablet computer, a notebook computer, a server, etc.
A fracturing construction device for a weak cementation sandstone layer of a heavy oil thermal production well comprises:
an obtaining module 210, configured to obtain a geological sample of a weakly cemented sandstone layer;
the first determining module 220 is used for determining parameters such as temperature, sand grain size distribution, rock mineral composition, young modulus, poisson's ratio, formation tensile strength, compressive strength and permeability of the weakly cemented sandstone layer according to the geological sample;
and the second determining module 230 is used for determining the phase particle size of the permeable solidification liquid of the stratum for the weakly cemented sandstone stratum according to the parameters such as the temperature, the sand grain size distribution, the rock mineral composition, the Young modulus, the Poisson's ratio, the tensile strength, the compressive strength and the permeability of the stratum.
And a third determining module 240 for determining construction parameters of the weakly consolidated sandstone layer according to the formation physical parameters, wherein the construction parameters comprise injection time, injection pressure and total amount of injected curing liquid.
The treatment module 250 performs permeable fracturing operations on the target formation according to the formation fracturing operations parameters.
Optionally, as shown in fig. 4, the processing module 250 includes:
a first processing submodule 251, which is used for selecting a proper high-permeability proppant for the particle size of the solidified material;
the first making submodule 252 mixes the high permeability proppant and the formation solidifying liquid base slurry to make a formation solidifying working solution with a certain viscosity, wherein the viscosity of the formation solidifying working solution is determined according to the fracturing construction requirement of the weakly cemented sandstone layer.
And the first fracturing submodule 253 is used for injecting the formation fracturing fluid pad fluid into the formation according to the injection pressure, and fracturing the formation to form a fracture.
And a second fracturing sub-module 254 for injecting the volume of the permeable formation-solidifying working fluid into the fracture after the formation has been fractured.
Optionally, the first determining module 220 includes:
the first determining submodule 221 is configured to determine the sand grain size of the dried geological sample by using a method combining a screening method and a laser grain size analyzer testing method.
The second determination submodule 222 analyzes the rock mineral composition using infrared spectroscopy.
And the third determining submodule 223 tests parameters such as the Young modulus, the Poisson ratio and the compressive strength of the rock sample by using a triaxial compression testing machine.
A fourth determination submodule 224 for testing the permeability of the rock sample using a liquid permeability tester;
and a fifth determining submodule 225 for testing the production well geothermal curve using well temperature logging.
Optionally, the third determining module 240 is specifically configured to:
determining the fracturing construction discharge capacity Q according to the liquid absorption capacity of the weakly consolidated sandstone layer and the site construction requirement;
determining the particle size of a stratum solidification working liquid solid phase material for solidification in the weakly consolidated sandstone layer according to a 'one-third bridging' theory and a sand particle size distribution curve of the geological sample;
determining the optimal fracture length according to the parameters of the stratum such as tensile strength, compressive strength and the like, and calculating the fracture volume according to the fracture width and the fracture height;
the injection time is determined from the fracture volume and displacement.
It should be noted that: in the process of solidifying the weak cementation sandstone layer, the method for reinforcing and preventing sand in the thick oil weak cementation sandstone layer is exemplified by only dividing the functional modules, and in practical application, the functions can be distributed to different functional modules according to needs to be completed, that is, the internal structure of the equipment is divided into different functional modules so as to complete all or part of the functions described above. In addition, the embodiment of the device for controlling sand in the zone of the weakly consolidated sandstone layer and the embodiment of the method for controlling sand in the zone of the weakly consolidated sandstone layer provided by the embodiment belong to the same idea, and the specific implementation process is detailed in the embodiment of the method and is not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
According to the Kelly permeating fracturing curing device for the thick oil weakly consolidated sandstone layer, provided by the embodiment of the invention, after a geological sample of the weakly consolidated sandstone layer is obtained, parameters such as the temperature, the grain size distribution of sand grains, rock mineral components, the Young modulus, the Poisson ratio, the tensile strength, the compressive strength and the permeability of the formation of the weakly consolidated sandstone layer are determined by using various methods, and further, the grain size range of a high-permeability propping agent for the weakly consolidated sandstone layer and the formation fracturing construction parameters are optimized. The permeable fracturing and solidifying device for the weakly consolidated sandstone stratum provided by the embodiment of the invention combines a stratum fracturing technology with an artificial gravel packing sand control method, and injects a high-permeability proppant and a permeable slurry into a fracture formed by fracturing. After the permeable slurry is solidified, the position of the high-permeability proppant is effectively fixed, and a seepage channel formed by the connection of the pores of the permeable slurry and the high-permeability proppant ensures the normal exploitation of the thickened oil. The problem that the weakly consolidated sandstone layer of the heavy oil thermal recovery well is easy to produce sand is effectively solved, and a series of losses caused by sand production of the oil well are effectively avoided.
Those of ordinary skill in the art will understand that: all or a portion of the steps of the above-described method may be carried out entirely by computer program instructions or associated hardware. The method steps may also be stored on a computer storage medium. When the program is executed, the steps of the above-described respective embodiments can be completed. Storage media including, but not limited to, computer read-only memory (ROM), random-access memory (RAM), magnetic or optical disks, etc. may store the program code.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and should not be limited thereto; while the principles, method steps, and the like of the invention have been set forth in detail in the foregoing description, it will be understood by those of ordinary skill in the art that: the method steps of the embodiment still have a certain modification space, and a person skilled in the art can replace some or all of the technical features of the method steps according to the foregoing description; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A permeable reinforcing sand control method in a layer of a weak cementation sandstone layer of a heavy oil thermal production well is characterized by comprising the following specific steps:
s1, obtaining a geological sample of the weakly cemented sandstone layer;
s2, determining physical and chemical parameters of the weakly cemented sandstone layer according to the obtained geological sample; the physicochemical parameters include, but are not limited to, temperature, sand particle size distribution, rock mineral composition, young's modulus, poisson's ratio, formation tensile strength, compressive strength, permeability;
s3, determining the particle size of the high-permeability proppant for fracturing and curing the weakly cemented sandstone layer according to the particle size distribution of the sand grains;
s4, designing the geometrical form of the fracture according to the Young modulus, tensile strength and compressive strength parameters of the stratum, and determining fracturing curing construction parameters; the fracturing and curing construction parameters comprise injection time, injection pressure, a preposed liquid volume of the injected stratum fracturing fluid and a volume of the injected stratum curing working fluid;
s5, performing fracturing curing construction on the weakly cemented sandstone layer according to the particle size of the high-permeability proppant and fracturing curing construction parameters;
said step S5 comprises
S5-1, selecting a proper support material according to the particle size of the high-permeability proppant;
s5-2, preparing stratum curing liquid base slurry with proper viscosity, water loss rate and curing time according to the temperature, rock mineral components, young modulus and permeability parameters;
s5-3, mixing the support material with stratum solidification liquid base slurry to prepare stratum solidification working fluid; the rheological property of the stratum solidification working fluid is determined according to the temperature of the weakly consolidated sandstone layer and the fracturing construction requirement;
s5-4, performing fracturing construction by using the formation fracturing fluid pad fluid according to the injection time and the injection pressure, and fracturing a formation fracture;
s5-5, after the crack is formed, injecting the prepared stratum curing working fluid into the stratum, stopping injecting after the crack is fully developed, closing the well and waiting for the solidification of the stratum curing working fluid to form a seepage channel;
said step S2 comprises
S2-1, measuring the temperature of the stratum at the target layer position by using a logging mode;
s2-2, determining sand grain size distribution of the dried geological sample by adopting a method combining a screening method and a laser particle size analyzer testing method;
s2-3, analyzing rock mineral components by using an infrared spectrum method;
s2-4, testing the Young modulus, poisson' S ratio, compressive strength and tensile strength of the rock sample by using a triaxial compression testing machine;
and S2-5, testing the permeability of the rock sample by using a liquid permeability tester.
2. The intraformational permeable reinforced sand control method for the weakly consolidated sandstone layer of the heavy oil thermal production well according to claim 1
Method, characterized in that said step S3 comprises
And S3-1, determining the grain size of the high-permeability propping agent for the fracturing and curing construction of the weakly cemented sandstone layer according to a sand grain size distribution curve of the geological sample by adopting a one-third bridging theory.
3. The method for permeable consolidation sand control in the stratum of the weakly cemented sandstone stratum of the heavy oil thermal production well according to claim 2, wherein the step S4 comprises
S4-1, determining fracturing construction discharge capacity Q;
s4-2, determining the optimal fracture length according to the parameters of the tensile strength and the compressive strength of the stratum;
and S4-3, calculating the volume of the crack according to the width, the length and the height of the crack.
4. An intrazonal permeable consolidated sand control device for weakly cemented sandstone formations in heavy oil thermal production wells, said device comprising:
the acquisition module is used for acquiring a geological sample of the weakly cemented sandstone layer;
the first determining module is used for determining the temperature, sand grain size distribution, rock mineral composition, young modulus, poisson's ratio, tensile strength, compressive strength and permeability parameters of the weakly consolidated formation according to the geological sample;
the second determination module is used for designing the geometrical form of the fracture according to the Young modulus, tensile strength and compressive strength of the stratum; a third determining module for determining the weak glue according to the sand grain size distribution and the fracture geometry
Fracturing and curing a high-permeability proppant and fracturing and curing construction parameters of the sandstone layer;
the processing module is used for realizing stratum fracturing and curing on the weakly cemented sandstone layer according to the high-permeability propping agent and the fracturing and curing construction parameters;
the processing module specifically comprises:
the first processing submodule selects a proper proppant material according to the particle size of the high-permeability proppant;
the first manufacturing submodule is used for mixing the proppant material with stratum curing liquid base slurry to manufacture stratum curing working fluid, wherein the viscosity of the stratum curing working fluid is determined according to the fracturing construction requirement of the weakly cemented sandstone layer;
the first fracturing submodule is used for injecting the formation fracturing fluid pad fluid into the formation according to the injection time and the injection pressure, and fracturing the formation to form a fracture;
and the second fracturing submodule is used for injecting the stratum curing working fluid into the fracture after the stratum forms the fracture, and closing the well to wait for setting after the injection is finished.
5. The permeable reinforced sand control device in the stratum for the weakly consolidated sandstone formation of the heavy oil thermal production well according to claim 4, wherein the first determination module comprises:
the first determining submodule is used for determining the sand grain size of the dried geological sample by adopting a method of combining a screening method and a laser grain size analyzer testing method;
the second determination submodule analyzes the rock mineral composition by using an infrared spectrum method;
the third determining submodule is used for testing the Young modulus, poisson ratio, compressive strength and tensile strength of the rock sample by using a triaxial compression testing machine;
a fourth determining submodule for testing the permeability of the rock sample by using a liquid permeability tester; and the fifth determining submodule acquires the ground temperature data by using a well temperature logging mode.
6. The permeable reinforced sand control device in the stratum for the weak cemented sand formation of the heavy oil thermal production well according to claim 5, wherein the second determination module is specifically configured to: designing the geometrical form of the fracture according to the Young modulus, tensile strength and compressive strength of the stratum; and designing the length and the width of the fracture by using finite element simulation software according to the Young modulus, the tensile strength and the compressive strength of the stratum and by taking the lowest thickness of the stratum ribbed slab reinforcement and the best flow conductivity as targets.
7. The permeable reinforced sand control device in the stratum for the weak cemented sand formation of the heavy oil thermal production well according to claim 5, wherein the third determination module is specifically configured to:
determining the fracture volume according to the geometrical parameters of the stratum fracture, and determining the total amount of injected stratum solidification working fluid by combining the stratum fluid absorption capacity;
determining the particle size of a high permeability propping agent for cementing the weakly cemented stratum according to a sand particle size distribution curve of the geological sample by adopting a one-third bridging theory;
determining a support material for the weakly cemented sandstone layer according to the particle size of the high permeability proppant;
and determining formation fracturing construction parameters according to the actual working conditions, wherein the fracturing construction parameters comprise injection time, injection pressure, the volume of a pre-injection liquid of the injected formation fracturing liquid and the volume of a solidification working liquid of the injected formation.
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