CN106869880B - A kind of sandstone reservoir acidization tool - Google Patents
A kind of sandstone reservoir acidization tool Download PDFInfo
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- CN106869880B CN106869880B CN201510921016.0A CN201510921016A CN106869880B CN 106869880 B CN106869880 B CN 106869880B CN 201510921016 A CN201510921016 A CN 201510921016A CN 106869880 B CN106869880 B CN 106869880B
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- 230000020477 pH reduction Effects 0.000 claims abstract description 263
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 191
- 239000002253 acid Substances 0.000 claims abstract description 103
- 239000012530 fluid Substances 0.000 claims abstract description 52
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims description 93
- 239000007788 liquid Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 22
- 239000003129 oil well Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 5
- 239000002981 blocking agent Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000704 physical effect Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000010306 acid treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000005213 imbibition Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- RBNPZEHAODHBPZ-UHFFFAOYSA-M dihydroxyaluminium Chemical compound O.O.NCC(=O)O[Al] RBNPZEHAODHBPZ-UHFFFAOYSA-M 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000000796 hypoacidity effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
Classifications
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention provides a kind of sandstone reservoir acidization tool, comprising: according to the well-log information of sandstone reservoir, carries out acidification classification to sandstone reservoir；According to the thickness of the sandstone reservoir of each acidification grade, the dosage of the acid solution of the sandstone reservoir of each acidification grade is determined；According to the perforation quantity and preforation tunnel parameter of the sandstone reservoir of each acidification grade, the dosage of the diverting agent of the sandstone reservoir of each acidification grade is determined；Diverting agent is degradable under preset temperature；Prepad fluid, acid solution and displacement fluid are implanted sequentially according to the sandstone reservoir that the sequence of acidification grade from high to low is each acidification grade, and when the next stage sandstone reservoir of the sandstone reservoir for each acidification grade injects prepad fluid, sandstone reservoir for each acidification grade injects diverting agent, so that diverting agent fills the partial completion eyelet of the sandstone reservoir of each acidification grade.Sandstone reservoir acidization tool provided by the invention can carry out homogeneous acidification to sandstone reservoir, and can reduce the cost of sandstone reservoir acidification.
Description
Technical field
The present invention relates to oil exploitation technology more particularly to a kind of sandstone reservoir acidization tools.
Background technique
Currently, improving the transformation degree of the sandstone reservoir near oil/gas well, common transformation side to improve Oil & Gas Productivity
Method has acidification transformation, fracturing reform.Existing acidification transformation method used is machine tool separate layer acid treatment, the machine tool point
Layer acidification specifically: after being classified to sandstone reservoir, set at the oil pipe corresponding to the depth location of every grade of sandstone reservoir
Downhole tool is set, such as: packer, bridge plug etc. are acidified step by step to separate sandstone reservoir not at the same level.
However, when stating machine tool separate layer acid treatment in use and being acidified to sandstone reservoir, due to needing in oil well
Downhole tool is set on oil pipe, so that the higher cost of sandstone reservoir acidification, efficiency are lower.
Summary of the invention
The present invention provides a kind of sandstone reservoir acidization tool, to solve the cost of the acidification of sandstone reservoir in the prior art compared with
Height, the lower problem of efficiency.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
First aspect present invention provides a kind of sandstone reservoir acidization tool, comprising:
According to the well-log information of sandstone reservoir, acidification classification is carried out to the sandstone reservoir；Wherein, each adjacent two is acidified
The difference of the horizontal minimum principal stress of the sandstone reservoir of grade is more than or equal to the first preset threshold；
According to the thickness of the sandstone reservoir of each acidification grade, the acid solution of the sandstone reservoir of each acidification grade is determined
Dosage；
According to the perforation quantity and preforation tunnel parameter of the sandstone reservoir of each acidification grade, each acid is determined
Change the dosage of the diverting agent of the sandstone reservoir of grade；Wherein, the preforation tunnel parameter includes preforation tunnel diameter and Perforation
Eye depth, the diverting agent are degradable under preset temperature；
According to the dosage of the acid solution of the sandstone reservoir of each acidification grade, according to the sequence of acidification grade from high to low
It is implanted sequentially prepad fluid, acid solution and displacement fluid for the sandstone reservoir of each acidification grade, and according to described each acidification etc.
The dosage of the diverting agent of the sandstone reservoir of grade, in the next stage sandstone reservoir injection of the sandstone reservoir for each acidification grade
When prepad fluid, the sandstone reservoir for each acidification grade injects diverting agent, so that the diverting agent fills each acid
Change the partial completion eyelet of the sandstone reservoir of grade, the partial completion eyelet is the perforation that liquid absorption amount is greater than the second preset threshold
Eyelet.
As described above, the well-log information according to sandstone reservoir, carries out acidification classification to the sandstone reservoir, it is specific to wrap
It includes:
According to the well-log information of the sandstone reservoir, each horizontal minimum principal stress of the sandstone reservoir is determined, and to every
A horizontal minimum principal stress carries out static and dynamic correction, the horizontal minimum principal stress after obtaining each correction；
According to the well-log information of the sandstone reservoir, each perforation layer position of the sandstone reservoir is determined；
According to after each correction horizontal minimum principal stress and perforation layer position, determine each perforation layer position
Horizontal minimum principal stress after the corresponding correction of the sandstone reservoir at place；
Horizontal minimum principal stress after the corresponding correction of sandstone reservoir where each perforation layer position and described
First preset threshold carries out acidification classification to the sandstone reservoir.
As described above, the perforation quantity and preforation tunnel parameter of the sandstone reservoir according to each acidification grade,
The dosage for determining the diverting agent of the sandstone reservoir of each acidification grade, specifically includes:
According to the preforation tunnel diameter, the diameter of the first diverting agent is determined, and according to the sand of each acidification grade
The perforation quantity of rock reservoir and preset coefficient determine the number of the first diverting agent of the sandstone reservoir of each acidification grade
Amount；
According to the diameter of the preforation tunnel diameter and first diverting agent, the diameter of the second diverting agent, and root are determined
According to the preforation tunnel diameter, the first diverting agent of the sandstone reservoir of the preforation tunnel depth, each acidification grade
The bulk density of quantity, second diverting agent determines the matter of the second diverting agent of the sandstone reservoir of each acidification grade
Amount；
According to the preforation tunnel diameter, the diameter of the diameter of first diverting agent and second diverting agent, determine
The diameter of third diverting agent, and according to the preforation tunnel diameter, the sand of the preforation tunnel depth, each acidification grade
The quality of second diverting agent of the sandstone reservoir of the quantity of the first diverting agent of rock reservoir, each acidification grade, described the
The real density of the real density of two diverting agents, the third diverting agent determines the sandstone reservoir of each acidification grade
The quality of third diverting agent.
As described above, first diverting agent, second diverting agent are identical with the material of the third diverting agent.
As described above, the thickness of the sandstone reservoir according to each acidification grade, determines each acidification grade
The dosage of the acid solution of sandstone reservoir, specifically includes:
According to the thickness of the sandstone reservoir of each acidification grade, before determining each acidification grade sandstone reservoir
Set the dosage of the dosage of acid solution, the dosage of main body acid solution and postposition acid solution.
As described above, the dosage of the acid solution of the sandstone reservoir according to each acidification grade, according to acidification grade
Sequence from high to low is that the sandstone reservoir of each acidification grade is implanted sequentially prepad fluid, acid solution and displacement fluid, specific to wrap
It includes:
According to the dosage of preposition acid solution, the dosage of main body acid solution and the postposition acid of the sandstone reservoir of each acidification grade
The dosage of liquid, be followed successively by it is described it is each acidification grade sandstone reservoir be injected separately into prepad fluid, preposition acid solution, main body acid solution, after
Set acid solution and displacement fluid.
As described above, the dosage of the diverting agent of the sandstone reservoir according to each acidification grade, is being described every
When the next stage sandstone reservoir of the sandstone reservoir of a acidification grade injects prepad fluid, for the sandstone reservoir of each acidification grade
Diverting agent is injected, is specifically included:
According to the quantity of the first diverting agent of sandstone reservoir of each acidification grade, the quality of the second diverting agent and the
The quality of three diverting agents, for it is described it is each acidification grade sandstone reservoir next stage sandstone reservoir inject prepad fluid when, be
The sandstone reservoir of each acidification grade is implanted sequentially the first diverting agent, the second diverting agent, third diverting agent.
As described above, the sandstone reservoir is divided into the sandstone reservoir of the first acidification grade and the sandstone storage of the second acidification grade
Layer；
Then the sandstone reservoir for being followed successively by each acidification grade is injected separately into prepad fluid, preposition acid solution, main acid
Liquid, postposition acid solution and displacement fluid, specifically include:
Sandstone reservoir for the first acidification grade is injected separately into prepad fluid, preposition acid solution, main body acid solution, postposition acid solution
And displacement fluid, complete the acidification of the sandstone reservoir of the first acidification grade；
After completing the acidification of sandstone reservoir of the first acidification grade, for the sandstone reservoir note of the second acidification grade
Enter prepad fluid, wherein it is described be the second acidification grade sandstone reservoir injection prepad fluid in include it is described first acidification grade
Sandstone reservoir the first diverting agent, it is described first acidification grade sandstone reservoir the second diverting agent, it is described first acidification etc.
The third diverting agent of the sandstone reservoir of grade；
When the pressure of oil well reaches third predetermined threshold value, the sand reservoir for being acidified grade for described second is injected separately into preposition
Acid solution, main body acid solution, postposition acid solution and displacement fluid complete the acidification of the sandstone reservoir of the second acidification grade.
Sandstone reservoir acidization tool provided by the invention, by it is each acidification grade sandstone reservoir acidification after,
The big preforation tunnel of liquid absorption amount in the sandstone reservoir of each acidification grade is subjected to temporarily stifled mode with diverting agent, is realized to sand
The separate layer acid treatment of rock reservoir reduces the process of sandstone reservoir acidification, improves the efficiency of sandstone reservoir acidification, and is improving
While oily well capacity, the cost of sandstone reservoir acidification is reduced.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of sandstone reservoir acidization tool embodiment one provided by the invention；
Fig. 2 is the flow chart of sandstone reservoir acidization tool embodiment two provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Acidization tool provided by the invention can carry out homogeneous acidification to the sandstone reservoir near oil well, to improve oil well
Production capacity, be particularly suitable for the strong oil well of heterogeneity, it is intended to solve in the prior art sandstone reservoir acidification higher cost, effect
Rate is lower, is acidified non-uniform problem.
Technical solution of the present invention is described in detail with specifically embodiment below.These specific implementations below
Example can be combined with each other, and the same or similar concept or process may be repeated no more in some embodiments.
Fig. 1 is the flow chart of sandstone reservoir acidization tool embodiment one provided by the invention, and what is involved is such as the present embodiment
What is according to the well-log information of sandstone reservoir, and to the detailed process that sandstone reservoir is acidified, the method for the present embodiment is suitable for oil
Well need to use the sandstone reservoir of acidification, the sandstone reservoir strong especially suitable for heterogeneity, can reduce the acidification of sandstone reservoir at
This.As shown in Figure 1, this method may include:
S101, the well-log information according to sandstone reservoir carry out acidification classification to sandstone reservoir；Wherein, each adjacent two acid
The difference for changing the horizontal minimum principal stress of the sandstone reservoir of grade is more than or equal to the first preset threshold.
Specifically, after oil well finishing drilling, so that it may according to the well-log information of sandstone reservoir (referred to as: reservoir), to reservoir into
Row acidification classification, when it is implemented, can according in the well-log information of reservoir minimum horizontal principal stress parameter and reservoir on
Each perforating site, determine the horizontal minimum principal stress of the reservoir where each perforation layer position, and then according to arbitrary neighborhood
Difference between the horizontal minimum principal stress of reservoir where two perforation layer positions, two by difference less than the first preset threshold
Reservoir division where perforation layer position is to be acidified grade with level-one, and difference is greater than or equal to two perforations of the first preset threshold
Reservoir division where layer position is different acidification grades.As the reservoir where each perforation layer position, corresponding horizontal minimum master is answered
Power have characterize the reservoir the consistent characteristic of physical property, therefore, it is above-mentioned be classified in this way by way of, can physical property is identical or
Similar reservoir division is in same level-one, and then the reservoir that physical property can be allowed same or similar is acidified simultaneously, to reach
To the purpose for carrying out homogeneous acidification to reservoir.Wherein, above-mentioned first preset threshold can be according to the physical property and user demand of reservoir
It determines.
S102, according to it is each acidification grade sandstone reservoir thickness, determine it is each acidification grade sandstone reservoir acid
The dosage of liquid.
Specifically, after carrying out acidification classification to reservoir, so that it may according to the classification, determine the storage of each acidification grade
Layer thickness, and then can according to the thickness, determine it is each acidification grade reservoir acid solution dosage, wherein how basis
The thickness of reservoir determines the dosage of the acid solution of reservoir, may refer to the prior art.
S103, according to it is each acidification grade sandstone reservoir perforation quantity and preforation tunnel parameter, determine each acidification
The dosage of the diverting agent of the sandstone reservoir of grade；Wherein, preforation tunnel parameter includes preforation tunnel diameter and preforation tunnel depth,
Diverting agent is degradable under preset temperature.
Specifically, after carrying out acidification classification to reservoir, so that it may according to the classification, determine the storage of each acidification grade
The perforation quantity of layer, and then the temporary of each reservoir for being acidified grade can be determined according to the perforation quantity and preforation tunnel parameter
The dosage of blocking agent, when it is implemented, can determine each acidification grade according to the perforation quantity of the reservoir of each acidification grade
The quantity of perforation temporarily stifled required for reservoir, meanwhile, the volume of preforation tunnel can be determined according to preforation tunnel parameter, in this way,
The perforation quantity that can be temporarily blocked up according to required for the reservoir of the volume of preforation tunnel and each acidification grade, determines each acid
Change the dosage of the diverting agent of the reservoir of grade, wherein the Perforation that the preforation tunnel that above-mentioned needs temporarily block up can be big for liquid absorption amount
Eye, the corresponding reservoir of the big perforation of these liquid absorption amounts are the interval of good penetrability in the reservoir of each acidification grade.
In the present embodiment, above-mentioned diverting agent can be filled in the reservoir of each acidification grade in a manner of being fully populated with
The big preforation tunnel of liquid absorption amount in, to realize the temporary closure of the interval of good penetrability in the reservoir to each acidification grade.
Wherein, above-mentioned diverting agent can according to the actual temperature of the reservoir of required acidification determine, simultaneously as above-mentioned diverting agent be
Degradable diverting agent under preset temperature, does not need the individually row of returning, therefore, it is possible to reduce the preparatory process of Reservoir Acidization improves
The efficiency of Reservoir Acidization.
It should be noted that since above-mentioned diverting agent is that the liquid absorption amount of each reservoir for being acidified grade is big to be penetrated for temporarily blocking up
Hole eyelet, to avoid when to next stage Reservoir Acidization, perforated zone corresponding to the big preforation tunnel of the liquid absorption amount can will be used
In the acid solution sucking of acidification next stage reservoir, the perforated zone is caused to be acidified excessive situation.When to the last one acidification grade
Reservoir be acidified after, since the reservoirs again without other acidification grades need to be acidified, can not have to temporarily block up last
The reservoir of a acidification grade, that is to say, that the dosage of the diverting agent of the reservoir of the last one acidification grade is 0.
S104, the dosage according to the acid solution of the sandstone reservoir of each acidification grade, according to acidification grade from high to low suitable
Sequence is implanted sequentially prepad fluid, acid solution and displacement fluid for the sandstone reservoir of each acidification grade, and according to the sand of each acidification grade
The dosage of the diverting agent of rock reservoir, when the next stage sandstone reservoir of the sandstone reservoir for each acidification grade injects prepad fluid,
Sandstone reservoir for each acidification grade injects diverting agent, so that diverting agent fills the part of the sandstone reservoir of each acidification grade
Preforation tunnel, partial completion eyelet are the preforation tunnel that liquid absorption amount is greater than the second preset threshold.
Specifically, after determining the dosage of acid solution and the dosage of diverting agent of reservoir of each acidification grade, so that it may
According to the sequence of acidification grade from high in the end, i.e., according to the corresponding average level minimum principal stress of reservoir of every level-one acidification grade
Sequence from small to large first injects prepad fluid, acid solution and displacement fluid for the smallest level-one reservoir of average level minimum principal stress, with
It is acidified, that is to say, that level-one reservoir first best to physical property is acidified.
After the level-one reservoir (i.e. acidification grade highest level-one reservoir) best to physical property is acidified, to the grade
While next stage reservoir (i.e. average level minimum principal stress take second place level-one reservoir) injection prepad fluid after reservoir, for this
Grade reservoir injects diverting agent, temporarily to block up the preforation tunnel that liquid absorption amount in this grade of reservoir is greater than the second preset threshold, i.e., temporarily blocks up the grade
The interval of good penetrability in reservoir does not block up the preforation tunnel of liquid absorption amount difference in this grade of sandstone reservoir temporarily, i.e., does not block up this grade of reservoir temporarily
The interval of middle poor permeability, so that the interval of poor permeability can continue to carry out again with next stage reservoir in this grade of reservoir
Acidification, and so on, until completing acidification to elementary level-one reservoir is acidified.Wherein, above-mentioned second preset threshold can be with
It is determined according to the physical property of reservoir and user demand.
It by way of the interval of this temporarily stifled good penetrability, can inhale that hyper acid to avoid the interval of good penetrability, cause
Acidification is excessive, and hypoacidity for the suction of the interval of poor permeability, causes to be acidified halfway problem, to realize to the uniform of reservoir
Acidification, and then the connectivity of oil well and reservoir is improved, improve oily well capacity.
In the prior art, when carrying out stage acidizing to reservoir using machine tool separate layer acid treatment, the oil in oil well is needed
Downhole tool is set on pipe, so that the higher cost of Reservoir Acidization, efficiency are lower.And sandstone reservoir acidification provided in this embodiment
Method, by it is each acidification grade Reservoir Acidization after, only with diverting agent by it is each acidification grade reservoir liquid absorption amount
Big preforation tunnel carries out temporarily stifled mode, so that it may realize to the layering homogeneous acidification of reservoir, reduce the standard of Reservoir Acidization
Standby process reduces the cost of Reservoir Acidization while improving oily well capacity.
Sandstone reservoir acidization tool provided by the invention, by only using after the Reservoir Acidization to each acidification grade
The big preforation tunnel of liquid absorption amount in the reservoir of each acidification grade is carried out temporarily stifled mode by diverting agent, so that it may be realized to reservoir
Layering homogeneous acidification, reduce the preparatory process of Reservoir Acidization, improve the efficiency of Reservoir Acidization, in the production for improving oil well
While energy, the cost of Reservoir Acidization is reduced.
Sandstone reservoir acidization tool provided by the present invention will be carried out using a specific embodiment below specific
Illustrate, in the present embodiment, the span of reservoir to be acidified is 113m, i.e., the vertical thickness of reservoir is 113m, should be to be acidified
Reservoir is divided into two-stage, the reservoir of the reservoir of the respectively first acidification grade and the second acidification grade；Above-mentioned diverting agent includes:
First diverting agent, the second diverting agent and third diverting agent.It is embodied before this method, needs to make some preparations, these
Preparation may include: the well-log information for obtaining sandstone reservoir.Fig. 2 is sandstone reservoir acidization tool provided by the invention implementation
The flow chart of example two, as shown in Fig. 2, this method may include:
S201, the well-log information according to sandstone reservoir determine each horizontal minimum principal stress of sandstone reservoir, and to each water
Flat minimum principal stress carries out static and dynamic correction, the horizontal minimum principal stress after obtaining each correction.
Specifically, the above-mentioned each horizontal minimum principal stress for how determining reservoir, and how to horizontal minimum principal stress into
Action static correction, the horizontal minimum principal stress after being corrected may refer to the prior art.
S202, the well-log information according to sandstone reservoir determine each perforation layer position of sandstone reservoir.
Specifically, it is above-mentioned how according to the well-log information of reservoir, it determines each perforation layer position of reservoir, may refer to existing skill
Art.
Illustratively, it is assumed that determined according to well-log information, the perforation segment length 44m of the reservoir in the present embodiment then can root
According to the porosity and permeability on the reservoir of this 44m, each perforation layer position of the reservoir is determined.
S203, according to after each correction horizontal minimum principal stress and perforation layer position, where determining each perforation layer position
Horizontal minimum principal stress after the corresponding correction of sandstone reservoir.
S204, according to the horizontal minimum principal stress and first after the corresponding correction of sandstone reservoir where each perforation layer position
Preset threshold carries out acidification classification to sandstone reservoir.
Specifically, after horizontal minimum principal stress after the corresponding correction of reservoir where obtaining each perforation layer position,
Between horizontal minimum principal stress after being assured that the corresponding correction of reservoir where two perforation layer positions of arbitrary neighborhood
Difference will be poor by difference less than the reservoir division where two perforation layer positions of the first preset threshold to be acidified grade with level-one
Reservoir division where value is greater than or equal to two perforation layer positions of the first preset threshold is different acidification grades, to ensure object
The same or similar reservoir division of property is in same level-one, and then the reservoir that physical property can be allowed same or similar carries out acid simultaneously
Change, to achieve the purpose that carry out homogeneous acidification to reservoir.It should be noted that in order to further increase the accuracy of classification, on
It states when carrying out acidification classification to reservoir, it can also be with reference to the porosity of the reservoir where each perforation layer position in well-log information
And permeability.
With continued reference to the example of above-mentioned S202, in the present embodiment, it is above-mentioned first acidification grade reservoir with a thickness of 23
Rice, second acidification grade reservoir with a thickness of 21 meters, wherein every meter has 16 preforation tunnels.Wherein, above-mentioned first acidification etc.
The difference between horizontal minimum principal stress after the correction of the reservoir of grade and the reservoir of the second acidification grade is greater than or equal to 3 megapascal
(i.e. the first preset threshold is 3 megapascal), the horizontal minimum principal stress after the correction of the reservoir of the first acidification grade is less than the second acid
Horizontal minimum principal stress after changing the correction of the reservoir of grade, that is to say, that the acidification grade of the reservoir of the first acidification grade is high,
The acidification grade of the reservoir of second acidification grade is low.
S205, according to it is each acidification grade sandstone reservoir thickness, determine it is each acidification grade sandstone reservoir it is preposition
The dosage of the dosage of acid solution, the dosage of main body acid solution and postposition acid solution.
Specifically, with continued reference to the example of above-mentioned S204, after the fractionation, so that it may according to above-mentioned first acidification grade
The thickness of reservoir determines the dosage of preposition acid solution of the first acidification grade reservoir, the use of the dosage of main body acid solution and postposition acid solution
Amount；According to the thickness of the reservoir of above-mentioned second acidification grade, dosage, the main body of the preposition acid solution of the second acidification grade reservoir are determined
The dosage of acid solution and the dosage of postposition acid solution.Wherein, how according to the thickness of reservoir, determine the preposition acid solution of reservoir dosage,
The dosage of main body acid solution and the dosage of postposition acid solution, may refer to the prior art.
S206, according to preforation tunnel diameter, determine the diameter of the first diverting agent, and store up according to the sandstone of each acidification grade
The perforation quantity of layer and preset coefficient determine the quantity of the first diverting agent of the sandstone reservoir of each acidification grade.
Specifically, above-mentioned first diverting agent is the port being located in reservoir for temporarily blocking up preforation tunnel, therefore, above-mentioned first
The diameter of diverting agent can be slightly less than preforation tunnel diameter, so that the first diverting agent can enter inside preforation tunnel, to penetrating
The port that hole eyelet is located in reservoir is temporarily blocked up, and will not be sucked into the runner inside reservoir.When it is implemented, can be with
According to preforation tunnel diameter, the diameter of the first diverting agent is determined, and according to the perforation quantity of the reservoir of each acidification grade and in advance
If coefficient, determine it is each acidification grade reservoir the first diverting agent quantity, wherein above-mentioned preset coefficient can basis
The physical property of user demand and reservoir is determined.
With continued reference to the example of above-mentioned S204, it is assumed that above-mentioned preforation tunnel diameter is 9mm, then the diameter of the first diverting agent can
To be slightly less than 9mm, in this example, the diameter of the first diverting agent is 8mm.It, should by taking the reservoir of above-mentioned first acidification grade as an example
First acidification grade reservoir with a thickness of 23 meters, wherein every meter has 16 preforation tunnels, then it is above-mentioned first acidification grade storage
The perforation quantity of layer is 368, it is assumed that above-mentioned preset coefficient is 0.5, it is determined that the first of the reservoir of above-mentioned first acidification grade
The quantity of diverting agent is 184.
S207, according to the diameter of preforation tunnel diameter and the first diverting agent, determine the diameter of the second diverting agent, and according to penetrating
Hole eye diameter, preforation tunnel depth, the quantity of the first diverting agent of the sandstone reservoir of each acidification grade, the second diverting agent
Bulk density determines the quality of the second diverting agent of the sandstone reservoir of each acidification grade.
Specifically, above-mentioned second diverting agent be for filling inside preforation tunnel, therefore, the diameter of above-mentioned second diverting agent
Can be slightly less than or equal to preforation tunnel diameter half, and be greater than difference between preforation tunnel diameter and the first diverting agent diameter
Value, so that the effect inside the second diverting agent filling preforation tunnel is preferable, and can be temporarily stifled from first to avoid the second diverting agent
It is flowed into gap between agent and preforation tunnel in the runner of reservoir.When it is implemented, can be according to preforation tunnel diameter, first
The diameter of diverting agent determines the diameter of the second diverting agent, with continued reference to the example of above-mentioned S206, it is assumed that above-mentioned preforation tunnel diameter
For 9mm, the diameter of the first diverting agent is 8mm, then the diameter of above-mentioned second diverting agent can be greater than 1mm, and be less than 4.5mm, then
In this example, the diameter of above-mentioned second diverting agent is 3mm.
After the diameter for determining the second diverting agent, so that it may the preforation tunnel inputted according to preforation tunnel diameter, user
Quantity, the bulk density of the second diverting agent of first diverting agent of the reservoir of depth, each acidification grade, determine each acidification etc.
The quality of second diverting agent of the reservoir of grade.By taking the reservoir of the first acidification grade in above-mentioned example as an example, it is assumed that preforation tunnel
Diameter is ΦPerforation, preforation tunnel depth is h, and the quantity of the first diverting agent of the sandstone reservoir of the first acidification grade is Q1, second
The bulk density of diverting agent is ρAccumulation, the quality of the second diverting agent of the sandstone reservoir of the first acidification grade is M2, then can basis
Formula (1) determines the mass M of the second diverting agent of the sandstone reservoir of the first acidification grade2, the formula (1) is specific as follows:
S208, according to preforation tunnel diameter, the diameter of the diameter of the first diverting agent and the second diverting agent, determine that third is temporarily blocked up
The diameter of agent, and according to preforation tunnel diameter, first diverting agent of the sandstone reservoir of preforation tunnel depth, each acidification grade
Quantity, the quality of the second diverting agent of the sandstone reservoir of each acidification grade, the real density of the second diverting agent, third diverting agent
Real density, determine it is each acidification grade sandstone reservoir third diverting agent quality.
Specifically, above-mentioned third diverting agent be for filling the gap in preforation tunnel inside between the second diverting agent, because
This, the diameter of above-mentioned third diverting agent can be slightly less than or the half of the diameter equal to the second diverting agent, and is more than or equal to perforation
Difference between eye diameter and the first diverting agent diameter, so that third diverting agent is filled in the gap between the second diverting agent
Effect it is preferable, and the stream of reservoir can be flowed into from the gap between the first diverting agent and preforation tunnel to avoid third diverting agent
In road.When it is implemented, can according to preforation tunnel diameter, the diameter of the first diverting agent, the second diverting agent diameter, determine
The diameter of three diverting agents, with continued reference to the example of above-mentioned S207, it is assumed that above-mentioned preforation tunnel diameter is 9mm, the first diverting agent
Diameter is 8mm, and the diameter of the second diverting agent is 3mm, then the diameter of above-mentioned third diverting agent can be less than 1.5m, is greater than or equal to
1mm, in this example, the diameter of above-mentioned third diverting agent are 1mm.
After the diameter for determining third diverting agent, so that it may according to preforation tunnel diameter, preforation tunnel depth, each acid
Change the quantity and the quality of the second diverting agent, the real density of the second diverting agent and the of the first diverting agent of the sandstone reservoir of grade
The real density of three diverting agents determines the quality of the third diverting agent of the reservoir of each acidification grade.With in above-mentioned example
For the reservoir of one acidification grade, it is assumed that preforation tunnel diameter is ΦPerforation, preforation tunnel depth is h, the storage of the first acidification grade
The quantity of first diverting agent of layer is Q1, the quality of the second diverting agent of the reservoir of the first acidification grade is M2, the second diverting agent
Real density is ρ2, the real density of third diverting agent is ρ3, the mass M of the third diverting agent of the reservoir of the first acidification grade3,
The mass M of the third diverting agent of the reservoir of the first acidification grade can be then determined according to formula (2)3, the formula (2) is specific such as
Under:
It should be noted that the material of above-mentioned first diverting agent, the second diverting agent and third diverting agent can be identical, it can also
With difference, but volume and bulk density are different, can specifically be determined according to the physical property for the reservoir being acidified.
Dosage, the dosage and postposition of main body acid solution of the preposition acid solution of S209, the sandstone reservoir for being acidified grade according to first
The dosage of acid solution, the sandstone reservoir for the first acidification grade are injected separately into prepad fluid, preposition acid solution, main body acid solution, postposition acid solution
And displacement fluid, complete the acidification of the sandstone reservoir of the first acidification grade.
Specifically, with continued reference to above-mentioned example, when the dosage and diverting agent of the acid solution for the reservoir for determining each acidification grade
Dosage after, so that it may according to acidification grade sequence from high to low, for each acidification grade reservoir be implanted sequentially it is preposition
Liquid, acid solution and displacement fluid.In this example, the acidification grade of the reservoir of the first acidification grade is high, the reservoir of the second acidification grade
Acidification grade it is low, then can first according to the dosage of preposition acid solution of reservoir of the first acidification grade, the dosage of main body acid solution and
The dosage of postposition acid solution, the reservoir for the first acidification grade are injected separately into prepad fluid, preposition acid solution, main body acid solution, postposition acid solution
And displacement fluid, to complete the acidification of the reservoir of the first acidification grade.Wherein, the reservoir for how being acidified grade for first injects preposition
Liquid, preposition acid solution, main body acid solution, postposition acid solution and displacement fluid, may refer to the prior art.
S210, prepad fluid is injected for the sandstone reservoir of the second acidification grade, wherein for the sandstone reservoir of the second acidification grade
It include the sandstone storage of the first diverting agent, the first acidification grade of the sandstone reservoir of the first acidification grade in the prepad fluid of injection
Layer the second diverting agent, first acidification grade sandstone reservoir third diverting agent.
Specifically, while injecting prepad fluid to the reservoir of the second acidification grade, according to fixed first acidification etc.
The dosage of the diverting agent of the reservoir of grade, i.e., according to the quantity of the first diverting agent, the quality of the second diverting agent and third diverting agent
Quality is injected in prepad fluid in the sandstone reservoir for the second acidification grade, is injected separately into the first diverting agent, the second diverting agent, the
Three diverting agents.Wherein, the first diverting agent and the second diverting agent can be injected separately into preset interval time, the second diverting agent and
Three diverting agents can inject simultaneously, which can determine according to the demand of user.
It is introduced into oil well in this way, the first diverting agent can inject prepad fluid with the reservoir for the second acidification grade, and
As the direction of prepad fluid flowing enters in the reservoir of the first acidification grade in the eyelet of the big perforation of each liquid absorption amount, temporarily to block up the
The big preforation tunnel of liquid absorption amount is located at the port in reservoir in the reservoir of one acidification grade, secondly, again by the second diverting agent and the
Three diverting agents are injected in the prepad fluid of reservoir injection of the second acidification grade, imbibition in the reservoir temporarily to block up the first acidification grade
Measure the inside of big preforation tunnel.
S211, when the pressure of oil well reaches third predetermined threshold value, for second acidification grade sand reservoir be injected separately into before
Acid solution, main body acid solution, postposition acid solution and displacement fluid are set, the acidification of the sandstone reservoir of the second acidification grade is completed.
Specifically, after the big preforation tunnel of liquid absorption amount temporarily blocks up in the reservoir to the first acidification grade, when passing through oil well
When the pressure of well head knows that the pressure of oil well reaches third predetermined threshold value, that is, second acidification grade reservoir imbibition pressure
When value, then the dosage of preposition acid solution, the dosage of the dosage of main body acid solution and postposition acid solution of the reservoir for being acidified grade according to second,
Reservoir for the second acidification grade is injected separately into preposition acid solution, main body acid solution, postposition acid solution and displacement fluid, to complete the second acidification
The acidification of the reservoir of grade.
After having executed S211, the acidification of the reservoir is just completed, until after the temperature recovery of the reservoir after being acidified,
The first diverting agent, the second diverting agent, the degradation of third diverting agent in the preforation tunnel of the reservoir of injection the first acidification grade, and lose
It goes after temporarily blocking up ability, drive a well open flow, has just reached the connectivity for improving the reservoir of oil well and near wellbore zone, and then improve the oil well
Production capacity purpose.
Sandstone reservoir acidization tool provided by the invention, by only using after the Reservoir Acidization to each acidification grade
The big preforation tunnel of liquid absorption amount in the reservoir of each acidification grade is carried out temporarily stifled mode by diverting agent, so that it may be realized to reservoir
Layering homogeneous acidification, reduce the preparatory process of Reservoir Acidization, improve the efficiency of Reservoir Acidization, in the production for improving oil well
While energy, the cost of Reservoir Acidization is reduced.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above-mentioned each method embodiment can lead to
The relevant hardware of program instruction is crossed to complete.Program above-mentioned can be stored in a computer readable storage medium.The journey
When being executed, execution includes the steps that above-mentioned each method embodiment to sequence；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
The various media that can store program code such as person's CD.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of sandstone reservoir acidization tool characterized by comprising
According to the well-log information of the sandstone reservoir, each horizontal minimum principal stress of the sandstone reservoir is determined, and to each water
Flat minimum principal stress carries out static and dynamic correction, the horizontal minimum principal stress after obtaining each correction；
According to the well-log information of the sandstone reservoir, each perforation layer position of the sandstone reservoir is determined；
According to after each correction horizontal minimum principal stress and perforation layer position, where determining each perforation layer position
The corresponding correction of sandstone reservoir after horizontal minimum principal stress；
The horizontal minimum principal stress and first after the corresponding correction of sandstone reservoir where each perforation layer position is preset
Threshold value carries out acidification classification to the sandstone reservoir；Wherein, the level of the sandstone reservoir of each adjacent two acidification grade is minimum main
The difference of stress is more than or equal to the first preset threshold；
According to the thickness of the sandstone reservoir of each acidification grade, the use of the acid solution of the sandstone reservoir of each acidification grade is determined
Amount；
According to the perforation quantity and preforation tunnel parameter of the sandstone reservoir of each acidification grade, described each acidification etc. is determined
The dosage of the diverting agent of the sandstone reservoir of grade；Wherein, the preforation tunnel parameter includes that preforation tunnel diameter and preforation tunnel are deep
Degree, the diverting agent are degradable under preset temperature；
It is institute according to the sequence of acidification grade from high to low according to the dosage of the acid solution of the sandstone reservoir of each acidification grade
The sandstone reservoir for stating each acidification grade is implanted sequentially prepad fluid, acid solution and displacement fluid, and according to each acidification grade
The dosage of the diverting agent of sandstone reservoir, it is preposition in the next stage sandstone reservoir injection of the sandstone reservoir for each acidification grade
It is that the upper level of the next stage sandstone reservoir is acidified the sandstone reservoir injection diverting agent of grade, so that the diverting agent when liquid
Fill the partial completion eyelet of the sandstone reservoir of the upper level acidification grade of the next stage sandstone reservoir, the partial completion hole
Eye is the preforation tunnel that liquid absorption amount is greater than the second preset threshold.
2. the method according to claim 1, wherein the sandstone reservoir according to each acidification grade
Perforation quantity and preforation tunnel parameter determine the dosage of the diverting agent of the sandstone reservoir of each acidification grade, specifically include:
According to the preforation tunnel diameter, the diameter of the first diverting agent is determined, and stored up according to the sandstone of each acidification grade
The perforation quantity of layer and preset coefficient determine the quantity of the first diverting agent of the sandstone reservoir of each acidification grade, institute
The first diverting agent is stated for temporarily blocking up the port that the preforation tunnel is located in reservoir；
According to the diameter of the preforation tunnel diameter and first diverting agent, the diameter of the second diverting agent is determined, and according to institute
State preforation tunnel diameter, the preforation tunnel depth, it is described it is each acidification grade sandstone reservoir the first diverting agent quantity,
The bulk density of second diverting agent determines the quality of the second diverting agent of the sandstone reservoir of each acidification grade, institute
The second diverting agent is stated for filling inside the preforation tunnel；
According to the preforation tunnel diameter, the diameter of the diameter of first diverting agent and second diverting agent, third is determined
The diameter of diverting agent, and stored up according to the sandstone of the preforation tunnel diameter, the preforation tunnel depth, each acidification grade
The quality of second diverting agent of the sandstone reservoir of the quantity of the first diverting agent of layer, each acidification grade, described second are temporarily
The real density of the real density of blocking agent, the third diverting agent determines the third of the sandstone reservoir of each acidification grade
The quality of diverting agent, the third diverting agent are used to fill the sky between the second diverting agent described in the preforation tunnel inside
Gap.
3. according to the method described in claim 2, it is characterized in that, first diverting agent, second diverting agent and described
The material of third diverting agent is identical.
4. according to the method described in claim 3, it is characterized in that, the thickness of the sandstone reservoir according to each acidification grade
Degree determines the dosage of the acid solution of the sandstone reservoir of each acidification grade, specifically includes:
According to the thickness of the sandstone reservoir of each acidification grade, the preposition acid of each acidification grade sandstone reservoir is determined
The dosage of the dosage of liquid, the dosage of main body acid solution and postposition acid solution.
5. according to the method described in claim 4, it is characterized in that, the sandstone reservoir according to each acidification grade
The dosage of acid solution is implanted sequentially preposition according to the sandstone reservoir that the sequence of acidification grade from high to low is each acidification grade
Liquid, acid solution and displacement fluid, specifically include:
According to the dosage of preposition acid solution of the sandstone reservoir of each acidification grade, the dosage of main body acid solution and postposition acid solution
Dosage, the sandstone reservoir for being followed successively by each acidification grade are injected separately into prepad fluid, preposition acid solution, main body acid solution, postposition acid
Liquid and displacement fluid.
6. according to the method described in claim 5, it is characterized in that, the sandstone reservoir according to each acidification grade
The dosage of diverting agent, when the next stage sandstone reservoir of the sandstone reservoir for each acidification grade injects prepad fluid, for institute
The sandstone reservoir injection diverting agent for stating each acidification grade, specifically includes:
It is temporary according to the quantity of the first diverting agent, the quality of the second diverting agent and third of the sandstone reservoir of each acidification grade
The quality of blocking agent is described when the next stage sandstone reservoir of the sandstone reservoir for each acidification grade injects prepad fluid
It is temporary that the sandstone reservoir of the upper level acidification grade of next stage sandstone reservoir is implanted sequentially the first diverting agent, the second diverting agent, third
Blocking agent.
7. according to the method described in claim 6, it is characterized in that, the sandstone reservoir is divided into the sandstone storage of the first acidification grade
The sandstone reservoir of layer and the second acidification grade；
Then the sandstone reservoir for being followed successively by each acidification grade be injected separately into prepad fluid, preposition acid solution, main body acid solution, after
Acid solution and displacement fluid are set, is specifically included:
Sandstone reservoir for the first acidification grade is injected separately into prepad fluid, preposition acid solution, main body acid solution, postposition acid solution and top
For liquid, the acidification of the sandstone reservoir of the first acidification grade is completed；
After completing the acidification of sandstone reservoir of the first acidification grade, before the sandstone reservoir injection for the second acidification grade
Set liquid, wherein it is described be the second acidification grade sandstone reservoir injection prepad fluid in include it is described first acidification grade sand
First diverting agent of rock reservoir, the second diverting agent of the sandstone reservoir of the first acidification grade, the first acidification grade
The third diverting agent of sandstone reservoir；
When the pressure of oil well reaches third predetermined threshold value, the sand reservoir for the second acidification grade is injected separately into preposition acid
Liquid, main body acid solution, postposition acid solution and displacement fluid complete the acidification of the sandstone reservoir of the second acidification grade.
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| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN103857877A (en) * | 2011-08-05 | 2014-06-11 | 普拉德研究及开发股份有限公司 | Method of fracturing multiple zones within a well |
| CN104314547A (en) * | 2014-08-18 | 2015-01-28 | 北京运嘉普泰石油天然气技术发展有限公司 | HAFD segmented optimization method and system |
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| CN103857877A (en) * | 2011-08-05 | 2014-06-11 | 普拉德研究及开发股份有限公司 | Method of fracturing multiple zones within a well |
| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN104314547A (en) * | 2014-08-18 | 2015-01-28 | 北京运嘉普泰石油天然气技术发展有限公司 | HAFD segmented optimization method and system |
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