CN114045159A - One-bag type plugging agent and preparation method thereof - Google Patents
One-bag type plugging agent and preparation method thereof Download PDFInfo
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- CN114045159A CN114045159A CN202111412548.3A CN202111412548A CN114045159A CN 114045159 A CN114045159 A CN 114045159A CN 202111412548 A CN202111412548 A CN 202111412548A CN 114045159 A CN114045159 A CN 114045159A
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- 238000002360 preparation method Methods 0.000 title claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 99
- 239000002245 particle Substances 0.000 claims abstract description 32
- 239000010445 mica Substances 0.000 claims abstract description 22
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 22
- 239000002981 blocking agent Substances 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000002557 mineral fiber Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 235000012343 cottonseed oil Nutrition 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
- 244000043261 Hevea brasiliensis Species 0.000 claims description 10
- 229920001222 biopolymer Polymers 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 10
- 239000012634 fragment Substances 0.000 claims description 10
- 229920003052 natural elastomer Polymers 0.000 claims description 10
- 229920001194 natural rubber Polymers 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 229910052902 vermiculite Inorganic materials 0.000 claims description 10
- 239000010455 vermiculite Substances 0.000 claims description 10
- 235000019354 vermiculite Nutrition 0.000 claims description 10
- 241000196324 Embryophyta Species 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000013311 vegetables Nutrition 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 13
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Sealing Material Composition (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to a bag type plugging agent, all components are arranged in a sealed packaging bag, the components can be sealed and stored in the sealed packaging bag at normal temperature and normal pressure, and do not react with each other, and the bag type plugging agent can be used after being unsealed and processed, and comprises the following components in parts: 5-10 parts of compressible deformable elastic blocking agent, 5-8 parts of mica sheet, 15-22 parts of mineral fiber, 3-8 parts of cottonseed, 15-25 parts of plant fiber, 15-25 parts of inorganic blocking agent and 20-30 parts of bridging agent. The plugging agent for the well leakage of the drilling well, which is prepared by the invention, has wide particle size distribution from micrometer to millimeter, can be used for an innovative plugging process which can be immediately dealt with as long as leakage occurs, does not need to judge the stratum condition in advance, is particularly suitable for permeable stratums, overbalanced stratums and induced cracks, can effectively play a role in bridging and plugging, and ensures that a plugging material can plug leaking layers with various sizes and different types, thereby ensuring the success rate at one time.
Description
Technical Field
The invention belongs to the technical field of well drilling and lost circulation, and particularly relates to a bag type plugging agent and a preparation method thereof.
Background
Lost circulation is a complex condition often encountered in drilling operations, particularly when drilling in fractured formations. Therefore, effective well-drilling leakage-proof and plugging technologies must be implemented, and the essential substance for implementing the technology is plugging materials. The most widely used and low-cost plugging material is bridging plugging at present. In the field implementation process of the conventional bridging plugging method, the plugging success rate is only 40% -60%, and the analysis of the plugging success rate mainly comprises the following aspects: 1. the size of the crack opening of the leaking layer is large, the grain diameter of the leaking stoppage material is small, and particularly, the grain diameter of the hard particle material is small, so that a bridge plug is difficult to form in the crack by bridging. 2. The crack opening is small in size, when bridging and plugging are carried out, large granular materials form a door sealing phenomenon at the crack opening, small materials are prevented from entering the crack opening to form a bridge plug, the surface of the bridge plug is plugged, but the large granular materials for sealing the door are separated from the crack opening under the actions of drilling tool collision, liquid flow scouring, drilling pulling hanging, drilling pumping and the like in subsequent drilling construction, and leakage occurs again.
Lost circulation is a common complication in the drilling process, with large losses. When leakage occurs in a drilling site, a site engineer can judge the characteristics of the leakage layer on site according to the leakage speed and the characteristics of the leakage layer, and then use different types of materials such as mica sheets, walnut shells, rubber particles, diatomite, asphalt, sawdust, cotton fibers, flax fiber chaff and the like to carry out different addition compounding according to experience. The plugging mode not only needs a large amount of plugging materials, but also needs a large amount of plugging materials. The problems of complex field operation and preparation, non-uniform formula, easy door sealing phenomenon caused by large particles, no strength, no temperature resistance and successful leaking stoppage are caused. During drilling, the plugging material of the 'sealing door' can continue to be back discharged, so that the stratum can be leaked again. Not only is engineering time wasted, but the overall drilling cost is also increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a bag-type plugging agent, all components are arranged in a sealed packaging bag, the components can be sealed and stored in the sealed packaging bag at normal temperature and normal pressure, and do not react with each other, and the bag-type plugging agent can be used after being treated after being unsealed, and comprises the following components in parts: 5-10 parts of compressible deformable elastic blocking agent, 5-8 parts of mica sheet, 15-22 parts of mineral fiber, 3-8 parts of cottonseed, 15-25 parts of plant fiber, 15-25 parts of inorganic blocking agent and 20-30 parts of bridging agent;
the use method of the one-bag type plugging agent comprises the following steps:
(1) adjusting the type of the leaking stoppage seam plate and the size of the seam according to the field condition, and preparing a bag type leaking stoppage agent and other tools;
(2) adding a bag of plugging agent in a sealing bag into slurry prepared in advance to prepare plugging slurry, stirring, and pouring the plugging slurry into a plugging instrument;
(3) installing the upper part of the leak stoppage instrument and the stirrer in place and locking by using a hoisting device, connecting a pressure sensor and a temperature sensor, pressurizing and releasing pressure, and stirring by using a stirrer water cooling pipeline;
(5) setting the temperature of a shaft and starting heating;
(6) heating to the designed temperature, stopping stirring, and gradually pressurizing to perform the plugging operation.
Preferably, the compressible and deformable elastic plugging agent comprises 22-35 parts of natural rubber, 2-3 parts of biopolymer and 2-3 parts of calcium carbonate.
In any of the above embodiments, it is preferred that the inorganic blocking agent has an average density of 2.4 to 3.0g/cm3The average particle size is 0.5-5 mm.
In any of the above embodiments, preferably, the preparation method of the inorganic blocking agent is as follows: uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain the inorganic plugging agent.
The invention also provides a preparation method of the bag-type plugging agent, which comprises the following steps:
(1) 22-35 parts of natural rubber, 2-3 parts of biopolymer and 2-3 parts of calcium carbonate. Adding the mixture into a mixer and fully mixing to obtain the compressible and deformable elastic plugging agent;
(2) uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain an inorganic plugging agent;
(3) and (2) crushing 5-8 parts of mica sheets, 15-22 parts of mineral fibers, 3-8 parts of cotton seeds and 15-25 parts of plant fibers into particles with the particle size of less than 10 meshes, and adding 5-10 parts of the compressible deformable elastic plugging agent prepared in the steps (1) and (2), 15-25 parts of the inorganic plugging agent and 20-30 parts of the bridging agent into a mixer to be fully mixed to obtain the plugging agent.
Preferably, the prepared plugging agent is gray white particles mixed with a small amount of dark brown fibers and particles, and the particle size distribution of the plugging agent is D50-33 mu m.
All the components of the prepared one-bag type plugging agent are placed in a sealing bag, when the one-bag type plugging agent is used, the mixed components are taken out and simply treated, and the one-bag type plugging agent can be directly used without additional configuration operation.
The prepared one-bag type plugging agent is simple to prepare on site, only needs to be added for small and medium-sized leakage, does not need to be mixed with other plugging materials, is high in injection speed in site construction, does not need special equipment, is advanced and mature in plugging process technology, high in safety coefficient, strong in operability and high in plugging success rate, and ensures smooth implementation of plugging construction of a complex well of a deep well. The product is designed in advance and packaged, and can be prepared into formulas with different concentrations according to the leakage rate and the type without knocking on site. The plugging agent can be used for plugging severely leaked strata, overbalance strata and cracks caused by overhigh liquid column pressure, and in addition, the on-site preparation and use can be mixed in the existing slurry, so that the required varieties of products on the plugging site are greatly reduced, the extra logistics cost of products of the plugging agent such as transportation, recovery and the like is reduced, the well site space is saved, the waste is reduced, and the plugging agent is environment-friendly and nontoxic. Can be used for fixed-point operation, and cleaning liquid and slug can be injected.
Detailed Description
In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.
Example one
The invention provides a bag-type plugging agent, all components are arranged in a sealed packaging bag, all the components can be sealed and stored in the sealed bag at normal temperature and normal pressure, and do not react with each other, and the bag-type plugging agent can be used after being treated after being unsealed, and comprises the following components in parts by weight: 5 parts of compressible deformable elastic blocking agent, 5 parts of mica sheet, 15 parts of mineral fiber, 3 parts of cottonseed, 15 parts of plant fiber, 15 parts of inorganic blocking agent and 20 parts of bridging agent, wherein the compressible deformable elastic blocking agent comprises 20 parts of natural rubber, 3 parts of biopolymer and 3 parts of calcium carbonate, and the average density of the inorganic blocking agent is 2.4-3.0g/cm3The average particle size is 0.5-5mm, and the preparation method of the inorganic plugging agent comprises the following steps: uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain the inorganic plugging agent.
The invention also provides a preparation method of the bag-type plugging agent, which comprises the following steps:
(1) 22-35 parts of natural rubber, 2-3 parts of biopolymer and 2-3 parts of calcium carbonate. Adding the mixture into a mixer and fully mixing to obtain the compressible and deformable elastic plugging agent;
(2) uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain an inorganic plugging agent;
(3) and (2) crushing 5 parts of mica sheets, 15 parts of mineral fibers, 3 parts of cotton seeds and 15 parts of plant fibers into particles with the particle size of less than 10 meshes, and adding 5 parts of the compressible deformable elastic plugging agent prepared in the steps (1) and (2), 15 parts of the inorganic plugging agent and 20 parts of the bridging agent into a mixer for fully mixing to obtain the plugging agent.
Preferably, the prepared plugging agent is gray white particles mixed with a small amount of dark brown fibers and particles, and the particle size distribution of the plugging agent is D50-33 mu m.
Example two
The invention provides a bag-type plugging agent, all components are arranged in a sealed packaging bag, and all the components are arranged in the sealed packaging bag at normal temperature and normal pressureThe bag-type plugging agent can be sealed and stored, does not react with each other, can be used after being treated after being unsealed, and comprises the following components in parts by weight: 7 parts of compressible deformable elastic blocking agent, 6 parts of mica sheet, 19 parts of mineral fiber, 6 parts of cotton seed, 20 parts of plant fiber, 20 parts of inorganic blocking agent and 25 parts of bridging agent, wherein the compressible deformable elastic blocking agent comprises 25 parts of natural rubber, 4 parts of biopolymer and 4 parts of calcium carbonate, and the average density of the inorganic blocking agent is 2.4-3.0g/cm3The average particle size is 0.5-5mm, and the preparation method of the inorganic plugging agent comprises the following steps: uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain the inorganic plugging agent.
The invention also provides a preparation method of the bag-type plugging agent, which comprises the following steps:
(1) adding 25 parts of natural rubber, 4 parts of biopolymer and 4 parts of calcium carbonate into a mixer, and fully mixing to obtain a compressible and deformable elastic plugging agent;
(2) uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain an inorganic plugging agent;
(3) and (2) crushing 6 parts of mica sheets, 19 parts of mineral fibers, 6 parts of cotton seeds and 20 parts of plant fibers into particles with the particle size of less than 10 meshes, and adding 8 parts of the compressible deformable elastic plugging agent prepared in the steps (1) and (2), 20 parts of the inorganic plugging agent and 25 parts of the bridging agent into a mixer to be fully mixed to obtain the plugging agent.
Preferably, the prepared plugging agent is gray white particles mixed with a small amount of dark brown fibers and particles, and the particle size distribution of the plugging agent is D50-33 mu m.
EXAMPLE III
The invention provides a bag-type plugging agent, all components are arranged in a sealed packaging bag, all the components can be sealed and stored in the sealed bag at normal temperature and normal pressure, and do not react with each other, and the bag-type plugging agent can be used after being treated after being unsealed, and comprises the following components in parts by weight: 10 parts of compressible deformable elastic plugging agent, 8 parts of mica sheet, 22 parts of mineral fiber, 8 parts of cotton seed and plant fiber25 parts of inorganic plugging agent and 30 parts of bridging agent, wherein the compressible and deformable elastic plugging agent comprises 30 parts of natural rubber, 5 parts of biopolymer and 5 parts of calcium carbonate, and the average density of the inorganic plugging agent is 2.4-3.0g/cm3The average particle size is 0.5-5mm, and the preparation method of the inorganic plugging agent comprises the following steps: uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain the inorganic plugging agent.
The invention also provides a preparation method of the bag-type plugging agent, which comprises the following steps:
(1) adding 30 parts of natural rubber, 5 parts of biopolymer and 5 parts of calcium carbonate into a mixer, and fully mixing to obtain a compressible and deformable elastic plugging agent;
(2) uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain an inorganic plugging agent;
(3) and (2) crushing 8 parts of mica sheets, 22 parts of mineral fibers, 8 parts of cotton seeds and 25 parts of plant fibers into particles with the particle size of less than 10 meshes, and adding 10 parts of the compressible deformable elastic plugging agent, 25 parts of the inorganic plugging agent and 30 parts of the bridging agent prepared in the steps (1) and (2) into a mixer for fully mixing to obtain the plugging agent.
Preferably, the prepared plugging agent is gray white particles mixed with a small amount of dark brown fibers and particles, and the particle size distribution of the plugging agent is D50-33 mu m.
When in specific use, the specific experimental steps are as follows:
(1) and adjusting the type of the leak stopping seam plate and the size of the seam according to the experimental requirements, and pre-installing the leak stopping seam plate in place.
(2) 1.5L of plugging slurry is prepared according to a plugging formula, stirred for 30min and poured into a plugging instrument.
(3) The upper part of the leak stoppage instrument and the stirrer are installed in place and locked by using a hoisting device, and are connected with pressure and temperature sensors, pressurization and pressure relief and a stirrer water cooling pipeline.
(4) Stirring is started, and the stirrer is set to rotate at 70-80 rpm.
(5) The wellbore temperature is set and the warming is initiated.
(6) Heating to the experiment temperature, stopping stirring, and gradually pressurizing. Selecting 0.5MPa, 0.7MPa, 1.0MPa, 1.5MPa, 3.5MPa, 5.0MPa, 7.0MPa, 10MPa, 12.0MPa, 15.0MPa and 18.0MPa as pressure test points, slowly pressurizing to 0.5MPa of an initial pressure test point, opening the valve, waiting for 5-10min, recording the initial pressure, the final pressure after 5-10min and the filtration loss every 5-10min, and keeping the valve in an open state through experiments.
If the initial loading pressure and the final stable pressure change is large and the leakage still occurs, continuously boosting to the initial pressure test point of 0.5MPa, continuously waiting for plugging for 5-10min until the initial loading pressure and the final stable pressure change is small or the leakage does not occur any more or the leakage occurs but basically tends to the stable leakage rate, gradually and slowly boosting to 0.7MPa or higher, continuously bearing pressure, increasing the pressure point every time, and completing the experiment until the pressure bearing reaches the required highest bearing pressure, and recording important parameters such as the leakage amount and the pressure bearing time under different pressures. The experimental data are shown in table 1 below:
TABLE 1 plugging wedge type crack (3.0-5.0mm) with plugging agent plugging formula prepared by the present invention
The above table shows that the plugging agent prepared by the invention can be used for plugging 3-5mm wedge-shaped seams, and the highest pressure bearing capacity is 14.98 MPa.
It will be understood by those skilled in the art that a bag-type plugging agent and a method for preparing the same according to the present invention, including any combination of the above-mentioned contents of the present specification and the parts shown in the detailed description, is not described in detail and in the embodiments constituting these combinations for the sake of brevity. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A bag-type plugging agent is characterized by comprising the following components in parts by weight: 5-10 parts of compressible deformable elastic blocking agent, 5-8 parts of mica sheet, 15-22 parts of mineral fiber, 3-8 parts of cottonseed, 15-25 parts of plant fiber, 15-25 parts of inorganic blocking agent and 20-30 parts of bridging agent.
2. The bag-type plugging agent as claimed in claim 1, wherein the elastic plugging agent comprises 22-35 parts of natural rubber, 2-3 parts of biopolymer and 2-3 parts of calcium carbonate.
3. The bag-type plugging agent as claimed in claim 1, wherein the average density of the inorganic plugging agent is 2.4-3.0g/cm3The average particle size is 0.5-5 mm.
4. The bag-type plugging agent as claimed in claim 1, wherein the preparation method of the inorganic plugging agent is as follows: uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain the inorganic plugging agent.
5. A preparation method of a bag-type plugging agent is characterized by comprising the following steps:
(1) 22-35 parts of natural rubber, 2-3 parts of biopolymer and 2-3 parts of calcium carbonate. Adding the mixture into a mixer and fully mixing to obtain the compressible and deformable elastic plugging agent;
(2) uniformly mixing mica sheets, expandable vermiculite and shell fragments according to the mass ratio of 1:1 (1-3), and crushing and screening to obtain an inorganic plugging agent;
(3) 5-8 parts of mica sheet, 15-22 parts of mineral fiber, 3-8 parts of cottonseed and 15-25 parts of vegetable fiber are crushed into particles with the particle size of less than 10 meshes;
(4) and (3) adding the crushed material obtained in the step (3), 5-10 parts of the compressible deformable elastic plugging agent, 15-25 parts of the inorganic plugging agent and 20-30 parts of the bridging agent obtained in the steps (1) and (2) into a mixer for fully mixing to obtain the plugging agent.
6. The method for preparing a bag-type plugging agent according to claim 5, wherein the particle size distribution of the plugging agent is D50-33 μm.
7. The use method of the bag-type plugging agent as claimed in claim 1, characterized in that the use method comprises the following steps in sequence:
(1) adding water into a bag of plugging agent in a sealing bag to prepare plugging slurry, stirring, and pouring the plugging slurry into a plugging instrument;
(2) installing the upper part of the leak stoppage instrument and the stirrer in place and locking by using a hoisting device, connecting a pressure sensor and a temperature sensor, pressurizing and releasing pressure, and stirring by using a stirrer water cooling pipeline;
(3) setting the temperature of a shaft and starting heating;
(4) stopping stirring, and pressurizing step by step to perform plugging operation.
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| US20030186819A1 (en) * | 2002-03-26 | 2003-10-02 | Halliburton Energy Services, Inc. | Compositions for restoring lost circulation |
| CN101649193A (en) * | 2009-06-18 | 2010-02-17 | 东营泰尔石油技术有限公司 | Compressible highly flexible plugging agent |
| CN101671550A (en) * | 2009-06-17 | 2010-03-17 | 东营泰尔石油技术有限公司 | Hard compound reinforcing bridging agent |
| CN104087274A (en) * | 2014-07-14 | 2014-10-08 | 中国石油集团渤海钻探工程有限公司 | Multi-stage blocking pressure-bearing plugging agent |
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