CN105401906B - Adjust stifled ball choosing method and adjust stifled ball shearing allowable stress test device - Google Patents
Adjust stifled ball choosing method and adjust stifled ball shearing allowable stress test device Download PDFInfo
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- CN105401906B CN105401906B CN201510873131.5A CN201510873131A CN105401906B CN 105401906 B CN105401906 B CN 105401906B CN 201510873131 A CN201510873131 A CN 201510873131A CN 105401906 B CN105401906 B CN 105401906B
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- ball
- adjusting
- plugging
- shearing
- allowable stress
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
Abstract
A kind of adjust of disclosure blocks up ball choosing method and adjusts stifled ball shearing allowable stress test device, and described adjust blocks up ball choosing method, including：The structure and injection parameter of perforated interval where obtaining borehole to be blocked；The shearing force for adjusting stifled ball in borehole opening position to be blocked is calculated according to the structure and injection parameter；Waited to choose the compressive resistance for adjusting stifled ball according to the computation of cutting force of the borehole opening position to be blocked；Wait to choose the shearing allowable stress for adjusting stifled ball described in measurement；When the shearing allowable stress is more than the compressive resistance, waits to choose described in selection and adjust stifled ball to carry out pitching.It is provided herein it is a kind of adjust stifled ball choosing method and adjust stifled ball shearing allowable stress test device to be easy to judge to adjust whether stifled ball meets compressive resistance, and then choose the stifled ball of qualified tune and carry out closure borehole.
Description
Technical Field
The application relates to the field of oil exploitation, in particular to a method for selecting a plugging ball and a device for testing shearing allowable stress of the plugging ball for a ball-throwing and selecting process.
Background
The ball throwing and selecting process is a technology for selectively blocking the corresponding blast hole of a high permeability layer by selecting the blocking adjusting balls with different diameters and density models to enable the blocking adjusting balls to be freely distributed along with water flow underground. The purpose of adjusting the water absorption profile of some special water injection wells (for example, wells with damaged casings, serious casings, large well inclination angles and other separate injection tools which cannot be normally put in, and mechanical separate injection wells) can be achieved through the ball throwing and selective injection process.
Periodical&Test of oil and gas well&The article introduction of Beijing 11 broken block pitching profile control technology application in the North China oilfield in the article No. 16, no. 2, is as follows: 1. the density of the plugging ball is determined, the position of the plugging ball in the injected water is determined, and in order to ensure that the plugging ball cannot sink to the bottom of a well or float to the wellhead, the density of the plugging ball is ensured to be close to or consistent with the density of the injected water, generally 0.999-1.098g/cm 3 . 2. High temperature resistance of more than 100 ℃ and pressure resistance of more than 40 MPa. 3. The diameter of the plugging ball is mainly designed according to the diameter of a perforation porthole of the water injection well, and is generally 10mm, 12mm or 14mm. The technology is effectively applied to the North China oil field, and the problem of adjusting the water absorption profile of the water injection well is solved to a certain extent.
Because the well depth of different water injection wells is different from the injection pressure, the pressure of a target layer in the well is different, and then the plugging adjusting ball is seated on the blasthole and is subjected to the dual functions of the water injection pressure and the pressure of a wellbore liquid column, if the compressive strength is unqualified, the plugging adjusting ball is forced into the blasthole or is sheared and damaged, so that the measure is invalid, the compressive strength of the plugging adjusting ball needs to be tested, whether the plugging adjusting ball meets the compressive strength is judged, and whether the ball throwing measure is effective is determined.
Disclosure of Invention
In view of the above technical problems, it is necessary to provide a method for selecting a plugging ball and a device for testing shearing allowable stress of the plugging ball, so as to determine whether the plugging ball meets the compressive strength, and further select a qualified plugging ball to plug the blasthole.
In order to achieve the above object, the present application provides a method for selecting a plugging ball, comprising:
acquiring the structure and injection parameters of a perforation section where a blast hole to be plugged is located;
calculating the shearing force of the plugging adjusting ball at the position of the blasthole to be plugged according to the structure and the injection parameters;
calculating the compressive strength of the adjusting and blocking ball to be selected according to the shearing force at the position of the blasthole to be blocked;
measuring the shearing allowable stress of the adjusting and blocking ball to be selected;
and when the shearing allowable stress is greater than the compressive strength, selecting the adjusting and blocking ball to be selected for ball shooting.
Preferably, the structure and the injection parameters comprise the number of layers of a perforation section where the blast hole to be plugged is located, water absorption capacity, area of the blast hole, radius of the blast hole, length of the perforation section, perforation density, water injection pressure and depth of the perforation section.
Preferably, the formula used in the step of calculating the shearing force is as follows:
wherein rho is the density of injected water, g/mm 3 ；A i Is the area of the blast hole, m 2 ；Q i M3, water absorption; r is the radius of the blast hole, mm; n is the perforation density, holes/meter; l is the length of the perforation segment m; p is water injection pressure, MPa; h is the perforation section depth, m;is the diameter of the blast hole, mm.
Preferably, the formula adopted in the step of calculating compressive strength is as follows:
wherein k sigma is the compressive strength, MPa, of the ball to be selected and plugged; sigma is the shearing stress, MPa, applied to the adjusting and blocking ball to be selected; k is a safety factor of the system,a constant; f is the shearing force of the plugging adjusting ball at the position of the blast hole to be plugged, and N is the shearing force of the plugging adjusting ball at the position of the blast hole to be plugged;selecting the diameter of the adjusting and blocking ball to be selected, which is mm;is the diameter of the blast hole, mm.
Preferably, the step of selecting the plugging ball comprises the following steps:
selecting a plugging ball with an initial diameter to execute the step of calculating compressive strength and the step of measuring shearing allowable stress;
when the shearing allowable stress of the adjusting and blocking ball with the initial diameter is larger than the compressive strength of the adjusting and blocking ball with the initial diameter, selecting the adjusting and blocking ball with the initial diameter for ball throwing;
when the shearing allowable stress of the plugging ball with the initial diameter is smaller than the compressive strength of the plugging ball, selecting the plugging ball with the diameter larger than the initial diameter according to a preset rule, and executing the step of calculating the compressive strength and the step of measuring the shearing allowable stress until the plugging ball with the diameter which meets the requirement that the shearing allowable stress is larger than the compressive strength of the plugging ball is measured; and selecting the adjusting and blocking ball with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the adjusting and blocking ball to throw the ball.
Preferably, the difference value obtained by subtracting the diameter of the blast hole to be plugged from the initial diameter is not less than 1mm;
the step of selecting the plugging ball according to the preset rule comprises the following steps:
on the basis of the initial diameter, the step of calculating the compressive strength and the step of measuring the shearing allowable stress are carried out one by taking the preset length as a diameter increasing unit until a plugging ball with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the plugging ball is measured; and selecting the adjusting and blocking ball with the diameter meeting the requirement that the shearing allowable stress is greater than the compressive strength of the adjusting and blocking ball for ball throwing.
Preferably, the predetermined length is 2mm.
The present application further provides a plugging ball shearing allowable stress testing device applied to the method for selecting the plugging ball, including:
a body having a chamber; the main body is provided with a pressure inlet and an extending inlet which are communicated with the cavity;
the mounting sleeve is detachably connected with the main body, and one end of the mounting sleeve extends into the cavity from the extending port;
the ball support is arranged in the mounting sleeve and is in sealing contact with the inner wall of the mounting sleeve; the ball support is provided with a through hole, and the through hole is close to the opening of the cavity for the regulating and blocking ball to be seated.
Preferably, the other end of the mounting sleeve is connected with a base, and an accommodating space is formed between the base and the ball support; the base is provided with air holes so as to communicate the interior of the sleeve with the outside.
Preferably, the inner wall of the mounting sleeve is provided with a limiting step, the ball support is limited by the limiting step, and a sealing ring is arranged between the side wall of the ball support and the inner wall of the mounting sleeve.
According to the technical scheme, the compression strength required by the plugging adjusting ball at the position of the blast hole to be plugged is calculated through reasonable analysis, the shearing allowable stress of the plugging adjusting ball is obtained through measurement, and then the plugging adjusting ball with the shearing allowable stress larger than the compression strength is selected.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a force analysis diagram of a plugging ball provided by the present application when the ball is located in a blasthole to be plugged;
FIG. 2 is a flow chart of a method for selecting a plugging ball according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a plugging ball shearing allowable stress testing device according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, after analyzing the main stress condition of the plugging adjusting ball 200 at the position of the blasthole 100 to be plugged after setting, the inventor can see, according to the theory of material mechanics, that the main force affecting the pressure resistance of the plugging adjusting ball 200 comes from the force in the X direction:
the X-direction force is mainly obtained by analyzing according to the basic theory of fluid mechanics: f x ＝ρQ i V i +△PA 1 (ii) a Wherein: rho Q i V i The impact force N caused by water absorption of the perforation section where the blast hole 100 to be plugged is located; delta PA 1 Is the differential pressure force caused by the bottom hole flowing pressure, N. And for Y-direction forces, mainly including: (1) friction force generated by the viscosity of the injection liquid, N; (2) the scouring force generated by the flowing of the injection liquid, N; (3) the force generated by the floating weight of the ball blockage, N. Since the influence of the Y-direction force on the pressure resistance of the plugging ball 200 is negligible, it will not be described in detail here.
In the above-mentioned formula, the compound of formula,in the formula: Δ P = P + ρ gh, which is the bottom hole flow pressure, MPa.
Based on the above analysis, please refer to fig. 2, an embodiment of the present application provides a method for selecting a plugging ball, and the present embodiment is applied to, but not limited to, selecting a plugging ball with a qualified compressive strength for ball pitching in a ball pitching and injecting process. In this embodiment, the method for selecting the plugging adjusting ball includes the following steps:
s1, obtaining a structure and injection parameters of a perforation section where a blast hole to be plugged is located.
The structure and the injection parameters can comprise the layer number of the perforation section where the blast hole 100 to be plugged is located, the water absorption capacity, the area of the blast hole 100, the radius of the blast hole 100, the length of the perforation section, the perforation density, the water injection pressure and the depth of the perforation section.
And S2, calculating the shearing force of the plugging adjusting ball 200 at the position of the blasthole 100 to be plugged according to the structure and the injection parameters.
In this step, the formula for calculating the shearing force may be:
wherein rho is the density of injected water in g/mm 3 ；A i Is the area of 100 holes, m 2 ；Q i M3, water absorption; r is the radius of the blast hole 100 mm; n is the perforation density, holes/meter; l is the length of the perforation segment, m; p is water injection pressure, MPa; h is the depth of the perforation section, m;is the diameter of a blast hole 100 mm.
And S3, calculating the compressive strength of the to-be-selected plugging ball according to the shearing force at the position of the to-be-plugged blast hole.
In this step, the formula used for calculating the compressive strength is as follows:
wherein k sigma is the compressive strength, MPa, of the adjusting and plugging ball 200 to be selected; sigma is the shear stress to which the adjusting and plugging ball 200 to be selected is subjected, and is MPa; k is a safety factor, constant; f is the shearing force of the plugging adjusting ball 200 at the position of the blasthole 100 to be plugged, and N is the shearing force;selecting the diameter of the adjusting and blocking ball 200 to be selected, which is mm;is the diameter of a blast hole 100 mm. k is a safety factor with a value greater than 1, for example k may be 1.3.
And S4, measuring the shearing allowable stress of the adjusting and blocking ball to be selected.
The shear allowable stress of the material needs to simulate the state of the plugging adjusting ball 200 when being positioned in the blasthole 100 to be plugged, and the pressure of the plugging adjusting ball 200 when being subjected to shear failure is measured under the continuous pressurization state. The diameter of the adjusting ball 200 to be selected can be 10mm, 12mm, 14mm, 16mm, 18mm and 20 mm.
Referring to fig. 3, in view of the requirement of this step, the present embodiment further provides a calibration ball shearing allowable stress testing apparatus applied to the calibration ball selecting method, including: a body 1 having a chamber 12; the main body 1 is provided with a pressure inlet 11 and an extending inlet which are communicated with the cavity 12; the mounting sleeve 2 is detachably connected with the main body 1, and one end of the mounting sleeve extends into the cavity 12 from the extending port; the ball support 4 is arranged in the mounting sleeve 2 and is in sealing contact with the inner wall of the mounting sleeve 2; the ball support 4 is provided with a through hole, and the through hole is close to the opening 41 of the cavity 12 for the adjusting and blocking ball 200 to sit on.
When in use, the ball support 4 with the same specification as the blasthole 100 to be plugged is selected, the plugging adjusting ball 200 is seated on the opening 41 of the through hole of the ball support 4, and the through hole of the ball support 4 is plugged. In order to facilitate the pressing, a small amount of sealant can be dipped on the surface of the plugging adjusting ball 200, so that the plugging effect of the plugging adjusting ball 200 is ensured. The ball 200 is located in the chamber 12, and the pressure inlet 11 may be connected to a pressing device for pressing. For safety, the whole testing device can be put into a pit or water for protection, the pressing pressure is 0-100MPa, the initial pressing size can be smaller, for example, 10MPa, then the pressing strength is gradually increased, the lifting interval can be any value from 1MPa to 20MPa each time until the plugging ball 200 is sheared and damaged, and the shearing allowable stress of the plugging ball 200 can be known by recording the current pressing value.
The other end of the mounting sleeve 2 can be connected with a base 3, and an accommodating space is formed between the base 3 and the ball support 4; the base 3 is provided with air holes so as to communicate the interior of the sleeve with the outside. In order to avoid that the broken plugging adjusting ball 200 can fly out of the ball support 4 under the condition of instantaneous pressure relief under the action of high pressure when the plugging adjusting ball 200 is sheared and damaged, the ball seat can block the broken plugging adjusting ball 200, so that the broken plugging adjusting ball 200 is kept in the accommodating space between the base 3 and the ball support 4, and the safety accident caused by the flying of the broken plugging adjusting ball 200 is prevented.
As shown in fig. 3, one end of the mounting sleeve 2 extends into the extending port to be in threaded connection with the body. The inner wall of the mounting sleeve 2 is provided with a limiting step, the ball support 4 is limited by the limiting step, and a sealing ring is arranged between the side wall of the ball support 4 and the inner wall of the mounting sleeve 2. It can be seen that the ball retainer 4 is mounted in the mounting sleeve 2 in a replaceable seal. When the ball support 4 is installed in the chamber 12, the opening 41 of the ball support 4 may be opposite to the pressure inlet 11.
Specifically, the diameter of the opening 41 of the through hole may be 8 millimeters (mm), 10mm, 12mm, 14mm, or 16mm, so as to form ball holders 4 with different specifications. Different specifications of the ball support 4 can simulate different blastholes 100, and then when the blastholes 100 of different specifications are simulated, only the ball support 4 needs to be replaced.
And S5, when the shearing allowable stress is greater than the compressive strength, selecting the adjusting and blocking ball to be selected for ball shooting.
In step S5, the step of selecting a plugging ball may include the following substeps:
s51, selecting a plugging ball 200 with an initial diameter to execute the step of calculating compressive strength and the step of measuring shearing allowable stress;
s510, when the shearing allowable stress of the adjusting and blocking ball 200 with the initial diameter is larger than the compressive strength of the adjusting and blocking ball, selecting the adjusting and blocking ball 200 with the initial diameter for ball injection;
s520, when the allowable shearing stress of the plugging ball 200 with the initial diameter is smaller than the compressive strength of the plugging ball, selecting the plugging ball 200 with the diameter larger than the initial diameter according to a preset rule, and executing the step of calculating the compressive strength and the step of measuring the allowable shearing stress until the plugging ball 200 with the diameter larger than the compressive strength of the plugging ball is measured; and selecting the adjusting and blocking ball 200 with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the adjusting and blocking ball for ball throwing.
The initial diameter needs to be larger than the diameter of the blasthole 100 to be plugged, so that the plugging adjusting ball 200 can be ensured to be seated on the blasthole 100 to be plugged. And the difference value obtained by subtracting the diameter of the blast hole to be plugged from the initial diameter is not less than 1mm. For example, the initial diameter may be 2mm larger than the diameter of the blasthole 100 to be plugged.
Further, the step of selecting a plugging ball according to a predetermined rule (the step S520) may include the following sub-steps:
s525, on the basis of the initial diameter, the step of calculating the compressive strength and the step of measuring the shearing allowable stress are carried out one by taking the preset length as a diameter increasing unit until the plugging ball 200 with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength is measured; and selecting the adjusting and blocking ball 200 with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the adjusting and blocking ball for ball injection.
In an embodiment, the predetermined length may be 2mm. Taking the preset length of 2mm and the initial diameter of 14mm as an example, when the allowable shearing stress of the 14mm plugging ball 200 is tested to be smaller than the compressive strength, whether the 16mm plugging ball 200 meets the compressive strength is tested, if the 16mm plugging ball 200 still does not meet the compressive strength, whether the 18mm plugging ball 200 meets the compressive strength is tested, and the like is carried out until the plugging ball 200 meeting the condition that the allowable shearing stress is larger than the compressive strength is selected.
According to the technical scheme, the compression strength required by the adjusting and blocking ball at the position of the blast hole to be blocked is calculated through reasonable analysis, the shearing allowable stress of the adjusting and blocking ball is obtained through measurement, and then the adjusting and blocking ball with the shearing allowable stress larger than the compression strength is selected.
In a specific embodiment, taking HN12-13 well as an example, the well depth of the target zone of the well (the structure and injection parameters of the perforation section of the blasthole 100 to be plugged) is 3213 meters, the water injection pressure is 12.4MPa, the diameter of the blasthole 100 is 12mm, and the injection displacement is 97 square/day. And (3) calculating the pressure of the 14mm plugging ball 200 at the position of the target layer to be 43.16MPa according to the steps S2 and S3, and multiplying the design requirement by 1.3 times of safety factor, wherein the compressive strength of the plugging ball 200 is required to be greater than 56MPa. According to the selection principle of the plugging ball 200 in the step S4, the pressure resistance test is carried out by adopting the plugging ball 200 with the diameter of 14mm, the numerical value of the plugging ball 200 subjected to shearing damage is tested to be about 76MPa, the error is positive or negative 2MPa, and the test result shows that the plugging ball 200 with the diameter of 14mm can completely meet the water injection requirement without selecting the plugging ball 200 with the larger diameter.
Meanwhile, the selection method of the plugging adjusting ball 200 is sequentially used for 3 well tests on large-inclination wells HN12-13, HN27-15 and HN11-9 in Liaohe oil field, and the implementation effect shows that after the selection method is used for selecting the plugging adjusting ball 200, the problems of measure invalidation, short measure effective period and the like caused by insufficient compressive strength of the plugging adjusting ball 200 do not occur, the ball throwing and selecting efficiency is greatly improved, and meanwhile, the effective period of the measure of the plugging adjusting ball 200 is longer.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges are inclusive of the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the indicated endpoints.
All articles and references disclosed, including patent applications and publications, are incorporated by reference herein for all purposes. The term "consisting essentially of 8230to describe a combination shall include the identified element, ingredient, component or step and other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not a disclaimer of such subject matter, nor is it to be construed that the inventors do not consider such subject matter to be part of the disclosed inventive subject matter.
Claims (10)
1. A method for selecting a plugging ball is characterized by comprising the following steps:
acquiring the structure and injection parameters of a perforation section where a blast hole to be plugged is located;
calculating the shearing force of the plugging adjusting ball at the position of the blasthole to be plugged according to the structure and the injection parameters;
calculating the compressive strength of the adjusting and plugging ball to be selected according to the shearing force at the position of the blasthole to be plugged;
measuring the shearing allowable stress of the adjusting and blocking ball to be selected;
and when the shearing allowable stress is greater than the compressive strength, selecting the adjusting and blocking ball to be selected for ball shooting.
2. A selection method as claimed in claim 1, characterized by: the structure and the injection parameters comprise the layer number of the perforation section where the blasthole to be plugged is located, the water absorption capacity, the blasthole area, the blasthole radius, the perforation section length, the perforation density, the injection water density, the water injection pressure and the perforation section depth.
3. A selection method as claimed in claim 2, characterized in that: the formula adopted in the step of calculating the shearing force is as follows:
wherein rho is the density of injected water in g/mm 3 ；A i Is the area of the blast hole, m 2 ；Q i M3, water absorption capacity; r is the radius of the blast hole, mm; n is perforation density, holes/meter; l is the length of the perforation segment m; p is water injection pressure, MPa; h is the depth of the perforation section, m;is the diameter of the blast hole, mm.
4. A selection method as claimed in claim 3, characterized by: the formula adopted in the step of calculating the compressive strength is as follows:
wherein k sigma is the compressive strength, MPa, of the adjusting and plugging ball to be selected; sigma is the shearing stress, MPa, applied to the adjusting and blocking ball to be selected; k is a safety factor, constant; f is the shearing force of the plugging adjusting ball at the position of the blast hole to be plugged, and N is the shearing force of the plugging adjusting ball at the position of the blast hole to be plugged;the diameter of the adjusting and blocking ball to be selected is mm;is the diameter of the blast hole, mm.
5. A selection method as claimed in claim 1, characterized in that: the step of selecting the plugging ball comprises the following steps:
selecting a plugging ball with an initial diameter to execute the step of calculating compressive strength and the step of measuring shearing allowable stress;
when the shearing allowable stress of the adjusting and blocking ball with the initial diameter is larger than the compressive strength of the adjusting and blocking ball with the initial diameter, selecting the adjusting and blocking ball with the initial diameter for ball throwing;
when the shearing allowable stress of the plugging ball with the initial diameter is smaller than the compressive strength of the plugging ball, selecting the plugging ball with the diameter larger than the initial diameter according to a preset rule, and executing the step of calculating the compressive strength and the step of measuring the shearing allowable stress until the plugging ball with the diameter which meets the requirement that the shearing allowable stress is larger than the compressive strength of the plugging ball is measured; and selecting the adjusting and blocking ball with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the adjusting and blocking ball to throw the ball.
6. A selection method as claimed in claim 5, characterized by: the difference value of subtracting the diameter of the blast hole to be plugged from the initial diameter is not less than 1mm;
the step of selecting the plugging ball according to the preset rule comprises the following steps:
on the basis of the initial diameter, the step of calculating the compressive strength and the step of measuring the shearing allowable stress are carried out one by taking the preset length as a diameter increasing unit until a plugging ball with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the plugging ball is measured; and selecting the adjusting and blocking ball with the diameter meeting the requirement that the shearing allowable stress is larger than the compressive strength of the adjusting and blocking ball to throw the ball.
7. A selection method according to claim 6, characterized in that: the predetermined length is 2mm.
8. A plugging ball shearing allowable stress testing device applied to the plugging ball selecting method according to claim 1, characterized by comprising:
a body having a chamber; the main body is provided with a pressure inlet and an extending inlet which are communicated with the cavity;
the mounting sleeve is detachably connected with the main body, and one end of the mounting sleeve extends into the cavity from the extending port;
the ball support is arranged in the mounting sleeve and is in sealing contact with the inner wall of the mounting sleeve; the ball support is provided with a through hole, and the through hole is close to the opening of the cavity and is used for the adjusting and blocking ball to be seated.
9. The test apparatus of claim 8, wherein: the other end of the mounting sleeve is connected with a base, and an accommodating space is formed between the base and the ball support; the base is provided with air holes so as to communicate the interior of the sleeve with the outside.
10. The test apparatus of claim 8, wherein: the inner wall of the mounting sleeve is provided with a limiting step, the ball support is limited by the limiting step, and a sealing ring is arranged between the side wall of the ball support and the inner wall of the mounting sleeve.
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| CN106014314B (en) * | 2016-07-05 | 2018-11-20 | 中交第四航务工程勘察设计院有限公司 | A kind of drill takes device with hydraulic rock core card |
| CN106907978B (en) * | 2017-02-06 | 2020-05-08 | 中国石油天然气股份有限公司 | Detection method and detection system for plugging ball |
| CN112360403A (en) * | 2020-09-29 | 2021-02-12 | 中海油能源发展股份有限公司 | Simulation device and test method for evaluating reservoir shearing resistance of gel plugging agent of screen pipe well completion production well |
| CN112980422B (en) * | 2021-03-31 | 2023-03-28 | 中国石油化工股份有限公司 | Timed gel-breaking carrier fluid composition and using method thereof |
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