CN110872499A - High-dehydration curing plugging agent, and preparation method and application thereof - Google Patents
High-dehydration curing plugging agent, and preparation method and application thereof Download PDFInfo
- Publication number
- CN110872499A CN110872499A CN201811024803.5A CN201811024803A CN110872499A CN 110872499 A CN110872499 A CN 110872499A CN 201811024803 A CN201811024803 A CN 201811024803A CN 110872499 A CN110872499 A CN 110872499A
- Authority
- CN
- China
- Prior art keywords
- agent
- parts
- plugging
- plugging agent
- high water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 208000005156 Dehydration Diseases 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 98
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 108010081750 Reticulin Proteins 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 32
- 239000002657 fibrous material Substances 0.000 claims abstract description 24
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 23
- 239000002981 blocking agent Substances 0.000 claims abstract description 22
- 230000003213 activating effect Effects 0.000 claims abstract description 17
- 229920000742 Cotton Polymers 0.000 claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims abstract description 12
- 239000012190 activator Substances 0.000 claims abstract description 12
- 239000006260 foam Substances 0.000 claims abstract description 12
- -1 polyethylene Polymers 0.000 claims abstract description 12
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 239000004794 expanded polystyrene Substances 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 19
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 13
- 239000000292 calcium oxide Substances 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000010440 gypsum Substances 0.000 claims description 8
- 239000011398 Portland cement Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 239000003002 pH adjusting agent Substances 0.000 claims description 2
- 239000000565 sealant Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 11
- 238000001914 filtration Methods 0.000 abstract description 9
- 230000009471 action Effects 0.000 abstract description 8
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 239000002253 acid Substances 0.000 description 11
- 239000002994 raw material Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 239000012065 filter cake Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000000499 gel Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000002937 thermal insulation foam Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a high-dehydration curing blocking agent, a preparation method and an application thereof, wherein the blocking agent comprises the following components in parts by weight: 60-70 parts of blast furnace slag; 5-10 parts of a reticular fiber material, wherein the reticular fiber material is polyethylene foam cotton or expanded polystyrene; 10-20 parts of a reinforcing agent; 3-9 parts of an activator; 4-6 parts of an alkaline pH regulator. The components of the high water loss plugging agent act together, so that the high water loss plugging agent has high water loss speed, and the filtration time is within 30 s; the curing material in the plugging agent is cured within 5-10 hours under the action of the activating agent, so that the well wall is reinforced, and the re-leakage is not easy to occur. In addition, most of the components of the plugging agent are acid-soluble substances, so that the plugging agent is suitable for plugging a production zone, and the plugging agent is easy to remove in the later stage and protects the production zone. Meanwhile, the blocking agent is simple in preparation method, is directly prepared by clear water, and has little environmental pollution; the material source is wide, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of drilling and plugging of oil and gas fields, and particularly relates to a high-water-loss curing plugging agent, and a preparation method and application thereof.
Background
In the process of oil and gas exploration and development, the leakage of drilling fluid into a stratum (well leakage for short) is a common complex condition in the drilling process, and the well leakage can lose the drilling fluid and influence the production timeliness. If the plugging is unsuccessful or untimely, serious accidents such as well collapse, blowout and the like are easily caused, and great economic loss is caused. In order to solve the above problems, it is a common practice to add a plugging agent (or called plugging agent) to the drilling fluid to improve the performance.
At present, commonly used plugging agents mainly comprise bridging agents, high water loss agents, chemical gels, inorganic gelling plugging agents and the like. The bridging leak stoppage is mainly based on the particle size grading principle, on the premise that the leakage characteristics are clearly mastered, otherwise, the bridging residence or door sealing phenomenon of the leak stoppage material in a leakage passage cannot be formed, so that the leak stoppage fails. The chemical gel plugging is mainly based on the fact that materials react with each other to form gel to plug the stratum, but the pressure bearing capacity and the reaction control time of the chemical gel plugging are difficult to control. The inorganic gelling system plugging is mainly the plugging of a cement slurry system, although the strength of a formed plugging layer is high, the cement slurry is not easy to stay in a leakage channel, the setting time is long, and the cement slurry is lost along with the fluctuation of formation fluid, so that the plugging failure is caused.
The high water loss plugging agent generally comprises a curing material, a fiber material, other auxiliary agents and the like, and the high water loss plugging agent rapidly loses water under the action of pressure difference and is cured to form a filter cake plugging leaking layer with certain strength. The existing high-water-loss plugging agent has a good plugging effect in the early stage, but in the later stage of drilling into a deeper stratum, the problem of pressure bearing difference and the like can cause repeated leakage.
Disclosure of Invention
In view of the above, the application provides a high-dehydration curing plugging agent, a preparation method and an application thereof, and the plugging agent provided by the invention has the advantages of fast plugging, high bearing strength, high plugging success rate and difficulty in causing repeated leakage.
The invention provides a high-dehydration curing plugging agent which comprises the following components in parts by weight:
60-70 parts of blast furnace slag;
5-10 parts of a reticular fiber material, wherein the reticular fiber material is polyethylene foam cotton or expanded polystyrene;
10-20 parts of a reinforcing agent;
3-9 parts of an activator;
4-6 parts of an alkaline pH regulator.
Preferably, the size range of the reticular fiber material is 4-10 meshes of a standard sample separation sieve.
Preferably, the enhancer is calcium oxide.
Preferably, the activator is gypsum or ultra-fine portland cement.
Preferably, the alkaline pH adjusting agent is caustic soda.
The invention provides a preparation method of the high water loss curing plugging agent, which comprises the following steps:
according to parts by weight, mixing blast furnace slag, a reticular fiber material, a reinforcing agent, an activating agent and an alkaline pH regulator to obtain the plugging agent.
Preferably, the method specifically comprises the following steps:
adding a reticular fiber material into water, and stirring at a low speed to obtain a first mixture;
adding an alkaline pH regulator into the first mixture, dissolving, adding a reinforcing agent, and stirring at a low speed to obtain a second mixture;
adding blast furnace slag into the second mixture, and stirring at a high speed to obtain a third mixture;
and adding an activating agent into the third mixture, and stirring at a high speed to obtain a blocking agent solution.
The invention provides the application of the high water loss curing plugging agent in the well drilling plugging.
Preferably, the high-water-loss curing plugging agent is suitable for plugging 1-6mm crack loss or permeability loss.
Compared with the prior art, the high water loss plugging agent provided by the invention mainly comprises blast furnace slag, a reticular fiber material, a reinforcing agent, an activating agent and an alkaline pH regulator in a certain ratio, wherein the reticular fiber material is polyethylene foam cotton or expanded polystyrene. The key point of the invention is to adopt polyethylene foam cotton or expanded polystyrene reticular fiber material, the fiber has small dependence on the size of the leakage layer, is easy to enter a leakage channel and reside, and is suitable for 1-6mm crack leakage or permeability leakage. The fiber adopted by the common high water loss plugging agent is easy to agglomerate in the preparation process and is easy to accumulate at the sealing opening, while the reticular fiber provided by the invention is soft in texture but is not agglomerated, the dispersibility is excellent, the accumulation stressed volume can be greatly reduced, so that the plugging layer is more compact, and the pressure bearing capacity of the plugging layer is strong. The components of the high water loss plugging agent act together, so that the high water loss plugging agent has high water loss speed, and the filtration time is within 30 s; the curing material in the plugging agent is cured within 5-10 hours under the action of the activating agent, so that the well wall is reinforced, and the re-leakage is not easy to occur.
In addition, most of the components of the plugging agent are acid-soluble substances, so that the plugging agent is suitable for plugging a production zone, and the plugging agent is easy to remove in the later stage and protects the production zone. Meanwhile, the blocking agent is simple in preparation method, is directly prepared by clear water, and has little environmental pollution; the material source is wide, and the cost is low.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The invention provides a high-dehydration curing plugging agent which comprises the following components in parts by weight:
60-70 parts of blast furnace slag;
5-10 parts of a reticular fiber material, wherein the reticular fiber material is polyethylene foam cotton or expanded polystyrene;
10-20 parts of a reinforcing agent;
3-9 parts of an activator;
4-6 parts of an alkaline pH regulator.
The high-dehydration curing plugging agent provided by the invention has the advantages of quick plugging, high bearing strength, high acid solubility, easiness in plugging removal, low cost and the like, and is beneficial to application.
According to parts by weight, the blocking agent comprises 60-70 parts of blast furnace slag as a curing material in the blocking agent. The blast furnace slag is waste slag discharged from a blast furnace in the steelmaking process in the steelmaking industry; from the chemical composition, the blast furnace slag belongs to silicate materials, and the main components of the blast furnace slag are CaO and SiO2And Al2O3. The embodiment of the invention adopts the blast furnace slag micro powder, the particle size of the slag micro powder is generally 200-400 meshes (the adopted slag in the target particle size range has no great influence on the performance of the plugging agent), and the specific surface area is more than or equal to 380m2Per kg; which contains Al2O3And more CaO, belonging to alkaline slag.
In the invention, the blocking agent comprises 5-10 parts by weight of a reticular fiber material, and the reticular fiber material is polyethylene foam (EPE, pearl cotton) or Expanded Polystyrene (EPS). In the embodiment of the invention, the size range of the reticular fiber material is 4-10 meshes of a standard sample separating sieve; the density is in the range of 0.03-0.05g/cm3The tensile strength is 3.4-3.8kg/cm2The tear strength is 2.6-2.9kg/cm2. If the size range of the reticular fibers is too large, the adaptability to cracks is weakened, a door is easily sealed and blocked to form a filter cake, once the filter cake is damaged, a leaking layer is exposed again, and re-leakage occurs; if the size range is too small, the plugging slurry cannot stay in the leakage passage, and the plugging slurry material flows to the deep part of the fracture along with the drilling fluid, so that the plugging fails.
The key point of the invention is to adopt polyethylene foam cotton or expanded polystyrene reticular fiber material, the fiber has small dependence on the size of the leakage layer, is easy to enter a leakage channel and reside, and is suitable for 1-6mm crack leakage or permeability leakage. The fiber adopted by the common high water loss plugging agent is easy to agglomerate in the preparation process and is easy to accumulate at the seal, while the reticular fiber provided by the invention is soft in texture but is not agglomerated, the dispersibility is excellent, the accumulation stressed volume can be greatly reduced, and thus, the plugging layer is more compact, and the pressure-bearing capacity of the plugging layer is favorably enhanced.
The plugging agent comprises 10-20 parts by weight of a reinforcing agent, preferably a reinforcing agent calcium oxide, and mainly enhances the fluid loss performance of materials. The blocking agent comprises 3-9 parts of an activating agent; the curing material in the plugging agent can be cured within 5-10 hours under the action of the activating agent, so that the well wall is reinforced. The activator is preferably gypsum or ultra-fine portland cement, which allows for more complete reaction of the setting material. Wherein the gypsum is monoclinic mineral, and the main chemical component is calcium sulfate (CaSO)4) A hydrate of (1). The fineness of the superfine portland cement is 600-800 meshes, and the seven-day compressive strength is more than 40 MPa.
And the high-dehydration curing plugging agent comprises 4-6 parts of an alkaline pH regulator. The alkaline pH regulator can be caustic soda, and the pH value of the formula is adjusted to 11-13, so that the chemical reaction is favorably carried out. The high-dehydration curing plugging agent can be applied in a solution state, namely, the high-dehydration curing plugging agent comprises the balance of water, and 40-60 kg of the components can be added in every 100 kg of water.
In the invention, the reticular fibers have strong adaptability to the leakage layer, are easy to enter and reside in the leakage channel, so that a bridging material is not required to be added. After the plugging agent is pumped to a leaking layer, the plugging agent rapidly loses water under the action of pressure difference to form a cured material plugging layer with certain strength, and under the action of ground temperature, the activating agent can cure and bond the plugging layer, so that the bearing strength in a short period can be greatly improved. Under the combined action of the components, the high water loss plugging agent has high water loss speed and the filtration time is within 30 s.
In addition, most of the components of the plugging agent are acid-soluble substances, so that the plugging agent is suitable for plugging a production zone, and the plugging agent is easy to remove in the later stage and protects the production zone. In conclusion, the high-dehydration curing plugging agent has the advantages of fast plugging, high pressure bearing capacity, high acid solubility and the like. Meanwhile, the blocking agent is simple in preparation method, is directly prepared by clear water, and has little environmental pollution; the material source is wide, and the cost is low.
The embodiment of the invention provides a preparation method of the high water loss curing plugging agent, which is directly mixed, and specifically comprises the following steps:
adding the reticular fiber material into water, and stirring at a low speed to obtain a first mixture;
adding the alkaline pH regulator into the first mixture, dissolving, adding the reinforcing agent, and stirring at a low speed to obtain a second mixture;
adding the blast furnace slag into the second mixture, and stirring at a high speed to obtain a third mixture;
and adding the activator into the third mixture, and stirring at a high speed to obtain the blocking agent solution.
In an embodiment of the invention, the raw material components may be mixed with clear water in sequence, with 40-60 kg of raw material being added per 100 kg of water. The content of each raw material component is as described above; the time of the low-speed stirring is independently 10 minutes to 15 minutes, and the time of the high-speed stirring is independently 20 minutes to 30 minutes.
After the plugging agent is prepared, the high water loss curing plugging agent is applied to well drilling plugging. Wherein the high water loss curing plugging agent can plug 1 mm-6 mm crack loss or permeability loss.
The experimental result shows that the invention has short filtration time which is controlled within 30 s. The plugging agent disclosed by the invention is short in curing time and can meet the requirements of on-site plugging construction. The plugging agent has higher compressive strength after being cured, the compressive strength is more than 15MPa, and the plugging requirement is met. The plugging agent has the characteristic of high acid solubility, the acid solubility is over 80 percent, and the plugging agent is suitable for plugging a production zone, is easy to remove the plugging in the later period and protects the production zone.
For further understanding of the present application, the high water loss curing plugging agent provided herein, its preparation method and application are specifically described below with reference to examples.
Blast furnace slag used in the following examplesThe particle size of the slag particles is 200-400 meshes and the specific surface area is more than or equal to 380m2Per kg, containing Al2O3And more CaO, belonging to alkaline slag; the reticular fiber material is polyethylene foam cotton or expanded polystyrene, is purchased from Xintian packaging material Co., Ltd of Xinxiang city, and has a density range of 0.03-0.05g/cm3The tensile strength is 3.4-3.8kg/cm2The tear strength is 2.6-2.9kg/cm2The defects of fragility, deformation and poor restorability of common foaming glue are overcome, and the size range of the crushed reticular fibers is 4-10 meshes of a standard sample separating sieve; the enhancer is calcium oxide well known in the art, and is not particularly limited; the gypsum is well known in the art and is not particularly limited, and the main chemical component is calcium sulfate (CaSO)4) A hydrate of (a); the superfine portland cement is commercially available, the fineness is 600-800 meshes, and the seven-day compressive strength is more than 40 MPa.
Example 1
The blocking agent comprises the following components in parts by weight: 10 parts of polyethylene foam cotton with 4-10 meshes, 70 parts of blast furnace slag, 10 parts of reinforcing agent calcium oxide, 4 parts of activating agent gypsum and 6 parts of caustic soda.
The preparation method comprises the following steps:
40 kg of raw material was added per 100 kg of water. Adding the reticular fiber into 300mL of clear water, stirring at a low speed for 15 minutes, adding the reinforcing agent after adding caustic soda for dissolution, stirring at a low speed for 10 minutes, adding blast furnace slag, stirring at a high speed for 20 minutes, adding the activating agent, and stirring at a high speed for 30 minutes to obtain the plugging agent solution.
Example 2
The blocking agent comprises the following components in parts by weight: 5 parts of polyethylene foam cotton with 4-10 meshes, 60 parts of blast furnace slag, 20 parts of reinforcing agent calcium oxide, 9 parts of activator superfine portland cement and 6 parts of caustic soda by using a standard sample separating sieve;
the preparation method comprises the following steps:
60 kg of raw materials are added per 100 kg of water. Adding the reticular fiber into 300mL of clear water, stirring at a low speed for 15 minutes, adding the reinforcing agent after adding caustic soda for dissolution, stirring at a low speed for 10 minutes, adding blast furnace slag, stirring at a high speed for 20 minutes, adding the activating agent, and stirring at a high speed for 30 minutes to obtain the plugging agent solution.
Example 3
The blocking agent comprises the following components in parts by weight: 8 parts of expanded polystyrene with 4-10 meshes, 65 parts of blast furnace slag, 15 parts of reinforcing agent calcium oxide, 8 parts of activator gypsum and 4 parts of caustic soda by using a standard sample separating sieve;
the preparation method comprises the following steps:
the preparation method comprises the following steps:
50 kg of raw material was added per 100 kg of water. Adding the reticular fiber into 300mL of clear water, stirring at a low speed for 15 minutes, adding the reinforcing agent after adding caustic soda for dissolution, stirring at a low speed for 10 minutes, adding blast furnace slag, stirring at a high speed for 20 minutes, adding the activating agent, and stirring at a high speed for 30 minutes to obtain the plugging agent solution.
Example 4
The blocking agent comprises the following components in parts by weight: 7 parts of expanded polystyrene with a standard sample separation sieve of 4-10 meshes, 70 parts of blast furnace slag, 15 parts of reinforcing agent calcium oxide, 3 parts of activator superfine portland cement and 5 parts of caustic soda;
the preparation method comprises the following steps:
55 kg of raw material was added per 100 kg of water. Adding the reticular fiber into 300mL of clear water, stirring at a low speed for 15 minutes, adding the reinforcing agent after adding caustic soda for dissolution, stirring at a low speed for 10 minutes, adding blast furnace slag, stirring at a high speed for 20 minutes, adding the activating agent, and stirring at a high speed for 30 minutes to obtain the plugging agent solution.
Example 5
The blocking agent comprises the following components in parts by weight: 6 parts of polyethylene foam cotton with 4-10 meshes, 65 parts of blast furnace slag, 14 parts of reinforcing agent calcium oxide, 9 parts of activator gypsum and 6 parts of caustic soda by using a standard sample separating sieve;
the preparation method comprises the following steps:
45 kg of raw material was added per 100 kg of water. Adding the reticular fiber into 300mL of clear water, stirring at a low speed for 15 minutes, adding the reinforcing agent after adding caustic soda for dissolution, stirring at a low speed for 10 minutes, adding blast furnace slag, stirring at a high speed for 20 minutes, adding the activating agent, and stirring at a high speed for 30 minutes to obtain the plugging agent solution.
Example 6 evaluation of Properties
1. Fluid loss time
High fluid loss is one of the most important properties of the sealant. The method is measured according to the method for testing the fluid loss in the SY/T5621-93 drilling fluid test program, and the fluid loss speed and the fluid loss are evaluated by reading the filtration completion time and the corresponding fluid loss.
The specific test steps are as follows:
1) pouring the plugging agent prepared in the embodiment into a clean pressure filter of a medium pressure filtration loss instrument until reaching a specified scale mark, then sequentially filling a gasket and dry filter paper, covering a cover and fixing, and placing a 300mL beaker below the pressure filter to measure the filtration volume;
2) and opening the gas cylinder, adjusting the pressure of a gas source to be 0.7MPa, opening the gas inlet valve in time, spraying gas out of an outlet, stopping timing, and recording the filtration time. Referring to the results in Table 1, it can be seen from the experimental results that the fluid loss time of the present invention is short and the fluid loss time is controlled within 30 s.
TABLE 1 results of fluid loss experiments for examples of the invention
| Experimental sample | Fluid loss time(s) | Fluid loss (mL) |
| Example 1 | 20 | 250 |
| Example 2 | 19 | 246 |
| Example 3 | 23 | 245 |
| Example 4 | 18 | 247 |
| Example 5 | 21 | 251 |
2. Compressive strength
And (3) placing the blocking agent filter cake in the experiment in a water bath at the temperature of 60 ℃ for curing for 24 hours, and measuring the strength of the cured blocking agent filter cake by using a strength tester, namely the compressive strength. The experimental result shows that the plugging agent has higher compressive strength after being cured, the compressive strength is more than 15MPa, and the plugging requirement is met.
TABLE 2 compression Strength results after curing for inventive examples
| Compressive strength (MPa) | |
| Example 1 | 16.6 |
| Example 2 | 15.5 |
| Example 3 | 17.4 |
| Example 4 | 15.1 |
| Example 5 | 16.1 |
3. Determination of the curing time
The prepared blocking agent is poured into a beaker, put into an oven for 60 ℃ water bath, measured once every 20 minutes, and the coagulation time is recorded. The experimental result shows that the blocking agent has short curing time and can meet the requirements of on-site plugging construction.
Table 3 curing time results for inventive examples
| Curing time (h) | |
| Example 1 | 8.2 |
| Example 2 | 8.9 |
| Example 3 | 9.2 |
| Example 4 | 10.5 |
| Example 5 | 9.5 |
4. Acid solubility
And drying and cooling the filter cake obtained by testing the filtration loss time, and weighing a certain mass of the filter cake. The acid dissolution rate of the plugging agent is determined according to the determination method of acid insoluble substances in SY/T5559-92 'general experimental method for treating agent for drilling fluid'. The results are shown in Table 4, and it can be seen from the experimental results that the plugging agent of the present invention has the characteristic of high acid solubility, and the acid solubility is all above 80%.
TABLE 4 results of acid solubility measurement of examples of the present invention
| Acid solubility (%) | |
| Example 1 | 80 |
| Example 2 | 81 |
| Example 3 | 82 |
| Example 4 | 82 |
| Example 5 | 80 |
5. Effect of staying in
The reticular fibers in the embodiments 1 and 2 of the present invention were respectively replaced with paper fibers (obtained by slightly soaking and kneading waste newspaper, and then putting the waste newspaper into a high-speed pulverizer, wherein the fiber length range is 0.5mm-1.5mm), polyurethane (obtained from polyurethane pipeline insulation foam, pulverized into 20-60 mesh particles by the pulverizer), and the rest components were unchanged and are correspondingly marked as sample 1 and sample 2. The test adopts a crack block with the width of 4mm and the length of 15cm, the crack block is arranged in a steel cylinder with the length of 50cm, a valve below the crack block is closed, leakage-stopping liquid is poured in the crack block, an upper cover is covered, and the upper cover is connected with a metering pump through a pipeline; the lower valve was opened, the metering pump was opened, and when the filtrate volume no longer increased, the pressure was recorded and the crack block was broken apart to measure the length of material intrusion. The results are as follows:
TABLE 5 residence Effect of embodiments of the invention
| Dwell length cm | Bearing capacity MPa | |
| Example 1 | 5.2 | >8 |
| Example 2 | 5.0 | >8 |
| Example 3 | 5.5 | >8 |
| Sample 1 | 1.5 | >8 |
| Sample 2 | 2.0 | >8 |
The above experimental results show that although the solid phase is not changed and the pressure bearing capacity is not changed, the residence length is obviously changed, the paper fibers in the sample 1 are easy to agglomerate, and the polyurethane in the sample 2 is also of a net structure, but has hard texture and is not easy to compress and extrude into the deep part of the crack.
According to the embodiments, the components of the high water loss plugging agent act together, so that the high water loss plugging agent has high water loss speed, and the filtration time is within 30 s; the curing material in the plugging agent is cured within 5-10 hours under the action of the activating agent, so that the well wall is reinforced, and the re-leakage is not easy to occur. In addition, most of the components of the plugging agent are acid-soluble substances, so that the plugging agent is suitable for plugging a production zone, and the plugging agent is easy to remove in the later stage and protects the production zone. Meanwhile, the blocking agent is simple in preparation method, is directly prepared by clear water, and has little environmental pollution; the material source is wide, and the cost is low.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (9)
1. A high-dehydration curing plugging agent comprises the following components in parts by weight:
60-70 parts of blast furnace slag;
5-10 parts of a reticular fiber material, wherein the reticular fiber material is polyethylene foam cotton or expanded polystyrene;
10-20 parts of a reinforcing agent;
3-9 parts of an activator;
4-6 parts of an alkaline pH regulator.
2. The high water loss curing plugging agent according to claim 1, wherein the size range of the reticular fiber material is 4-10 mesh standard sample sieve.
3. The high water loss curing plugging agent of claim 1, wherein said reinforcing agent is calcium oxide.
4. The high water loss curing plugging agent according to claim 1, wherein said activator is gypsum or ultra fine portland cement.
5. The high water loss curing plugging agent of claim 1, wherein said basic pH adjusting agent is caustic soda.
6. The method for preparing the high water loss curing plugging agent of claim 1, comprising the following steps:
according to parts by weight, mixing blast furnace slag, a reticular fiber material, a reinforcing agent, an activating agent and an alkaline pH regulator to obtain the plugging agent.
7. The preparation method according to claim 6, which specifically comprises:
adding a reticular fiber material into water, and stirring at a low speed to obtain a first mixture;
adding an alkaline pH regulator into the first mixture, dissolving, adding a reinforcing agent, and stirring at a low speed to obtain a second mixture;
adding blast furnace slag into the second mixture, and stirring at a high speed to obtain a third mixture;
and adding an activating agent into the third mixture, and stirring at a high speed to obtain a blocking agent solution.
8. The use of the high water loss cured plugging agent according to any one of claims 1 to 5 for plugging a drilling well.
9. The use according to claim 8, wherein the high water loss cured sealant is suitable for plugging 1-6mm crack loss or permeability loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024803.5A CN110872499A (en) | 2018-09-04 | 2018-09-04 | High-dehydration curing plugging agent, and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024803.5A CN110872499A (en) | 2018-09-04 | 2018-09-04 | High-dehydration curing plugging agent, and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110872499A true CN110872499A (en) | 2020-03-10 |
Family
ID=69716872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811024803.5A Pending CN110872499A (en) | 2018-09-04 | 2018-09-04 | High-dehydration curing plugging agent, and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110872499A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115806808A (en) * | 2021-09-14 | 2023-03-17 | 中国石油化工股份有限公司 | Bridging leakage blocking method and application thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191024A (en) * | 2011-04-11 | 2011-09-21 | 大庆石油管理局 | Curable leak-stopping agent |
| CN102443383A (en) * | 2011-09-06 | 2012-05-09 | 中国石油天然气集团公司 | High-dehydration hardenable plugging sealing agent |
| CN103242813A (en) * | 2013-04-24 | 2013-08-14 | 中国石油集团渤海钻探工程有限公司 | Gel curing solution and preparation method thereof |
| CN103923627A (en) * | 2014-04-22 | 2014-07-16 | 西安石油大学 | Drilling pressure-bearing plugging agent for oil-gas wells and preparation and application thereof |
| CN104152125A (en) * | 2014-08-16 | 2014-11-19 | 成都汉元君业油田技术有限公司 | High dehydration solidification pressuring bearing plugging agent |
| CN104559979A (en) * | 2015-01-19 | 2015-04-29 | 中国石油集团渤海钻探工程有限公司 | Efficient-dehydration lost circulation additive |
| CN105062440A (en) * | 2015-08-31 | 2015-11-18 | 天津中油渤星工程科技有限公司 | Leakage-stoppage and leakage-proof material |
| CN107987814A (en) * | 2017-12-05 | 2018-05-04 | 西南石油大学 | A kind of multi-functional low-density cures working solution system |
-
2018
- 2018-09-04 CN CN201811024803.5A patent/CN110872499A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191024A (en) * | 2011-04-11 | 2011-09-21 | 大庆石油管理局 | Curable leak-stopping agent |
| CN102443383A (en) * | 2011-09-06 | 2012-05-09 | 中国石油天然气集团公司 | High-dehydration hardenable plugging sealing agent |
| CN103242813A (en) * | 2013-04-24 | 2013-08-14 | 中国石油集团渤海钻探工程有限公司 | Gel curing solution and preparation method thereof |
| CN103923627A (en) * | 2014-04-22 | 2014-07-16 | 西安石油大学 | Drilling pressure-bearing plugging agent for oil-gas wells and preparation and application thereof |
| CN104152125A (en) * | 2014-08-16 | 2014-11-19 | 成都汉元君业油田技术有限公司 | High dehydration solidification pressuring bearing plugging agent |
| CN104559979A (en) * | 2015-01-19 | 2015-04-29 | 中国石油集团渤海钻探工程有限公司 | Efficient-dehydration lost circulation additive |
| CN105062440A (en) * | 2015-08-31 | 2015-11-18 | 天津中油渤星工程科技有限公司 | Leakage-stoppage and leakage-proof material |
| CN107987814A (en) * | 2017-12-05 | 2018-05-04 | 西南石油大学 | A kind of multi-functional low-density cures working solution system |
Non-Patent Citations (1)
| Title |
|---|
| 马超等: "一种新型高渗透层钻井堵漏剂 ", 《断块油气田》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115806808A (en) * | 2021-09-14 | 2023-03-17 | 中国石油化工股份有限公司 | Bridging leakage blocking method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4129949A1 (en) | Unfired construction material using original state shielding soil and preparation method therefor | |
| US5106423A (en) | Formation grouting method and composition useful therefor | |
| US5151126A (en) | Cement-base injection grout for consolidating structures | |
| CN105367004A (en) | C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method | |
| CN110872503B (en) | Novel composite plugging agent for well drilling and application thereof | |
| CN104152125A (en) | High dehydration solidification pressuring bearing plugging agent | |
| CN103553375A (en) | Composite soil solidifying agent, and preparation and application thereof | |
| CN109369137A (en) | A kind of acid and alkali-resistance concrete | |
| CN108395126B (en) | Anti-seepage leak-stopping material and application thereof in hydraulic engineering | |
| CN110872499A (en) | High-dehydration curing plugging agent, and preparation method and application thereof | |
| CN106747130B (en) | A kind of high temperature resistant oil well sealing agent | |
| Mollamahmutoglu | Treatment of medium-to coarse-grained sands by fine-grained portland cement (FGPC) as an alternative grouting material to silicate-ester grouts | |
| Chuaqui et al. | Mix design and quality control procedures for high mobility cement based grouts | |
| CN113354360B (en) | Concrete for deep well and preparation method thereof | |
| Kennedy | Pressure grouting fine fissures | |
| CN115611597A (en) | Spraying material, preparation method thereof and spraying method in roadway | |
| JP4505064B2 (en) | Ground consolidation improver | |
| CN108383418A (en) | A kind of water-permeable cement concrete and its preparation method using inorganic powder reinforcing agent suitable for severe cold area | |
| Hu et al. | Study on high-performance spraying self-healing material for gas sealing in coal mines | |
| Youssef et al. | Pozzolanic activity assessment of some mineral additives used in roller compacted concrete for dam construction | |
| CN113416051A (en) | Rapid sealing material and preparation method thereof | |
| CN114804737B (en) | Cement-free grouting material for tunnel and preparation method thereof | |
| CN109400088A (en) | A method of solving Slag concrete bleeding | |
| CN103043938A (en) | Impermeable micro composite particles of concrete | |
| Ludwig | Theoretical and practical research on the alkali-silica reaction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200310 |
|
| RJ01 | Rejection of invention patent application after publication |