CN115746804A - Oleophylic inert material for oil-based drilling fluid plugging and preparation method thereof - Google Patents
Oleophylic inert material for oil-based drilling fluid plugging and preparation method thereof Download PDFInfo
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- CN115746804A CN115746804A CN202111027489.8A CN202111027489A CN115746804A CN 115746804 A CN115746804 A CN 115746804A CN 202111027489 A CN202111027489 A CN 202111027489A CN 115746804 A CN115746804 A CN 115746804A
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Abstract
The invention provides a preparation method of an oleophylic inert material for plugging oil-based drilling fluid. The inert plugging material has strong hydrophilicity, is not easy to reside in the oil-based drilling fluid, has poor stability of a plugging layer and has unsatisfactory plugging effect. On the premise of keeping the original plugging performance, the modified inert material prepared by the invention has the advantages that the surface polymer absorbs oil and expands, has cohesiveness, can cohere with rocks of a leaking layer and an auxiliary plugging material, improves the staying property of the plugging material and the stability of the plugging layer, solves the problems of return spitting, re-leakage and the like of the plugging material, and meets the plugging requirement of the oil-based drilling fluid. The preparation method provided by the invention adopts a high-polymer high-temperature mixing method, is safe and simple, and is convenient for large-scale production. The invention also provides a lipophilic inert material for plugging the oil-based drilling fluid.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and particularly relates to a lipophilic inert material for plugging an oil-based drilling fluid and a preparation method thereof.
Background
Along with more and more complex stratums encountered by drilling of the oil-based drilling fluid, the fracture pores of the stratums encountered by drilling are more developed, the oil-based drilling fluid is seriously leaked, and the oil-based drilling fluid plugging material is suitable for research and development and application of oil-based drilling fluid plugging materials but develops slowly. For the leakage loss of the oil-based drilling fluid, the commonly used plugging material on site still takes the water-based drilling fluid plugging material as the main material. However, the plugging materials have strong hydrophilicity and poor compatibility in oil-based drilling fluid, so that the retention capacity of the plugging materials is insufficient, the anti-damage capacity of a plugging layer is poor, the backflow and the re-leakage are easy to occur, and the plugging effect is not ideal. The plugging material in the prior art does not have lipophilicity, oil absorption cohesiveness, and can not solve the problems of difficult material residence, poor stability of a plugging layer and the like in the plugging of the oil-based drilling fluid.
Disclosure of Invention
In view of the above, the invention aims to provide a lipophilic inert material for oil-based drilling fluid plugging and a preparation method thereof.
The invention provides a preparation method of a lipophilic inert material for plugging an oil-based drilling fluid, which comprises the following steps:
and mixing the inert plugging material and the lipophilic thermoplastic polymer, and then processing and molding to obtain the lipophilic inert material for plugging the oil-based drilling fluid.
Preferably, the inert plugging material is one or more selected from calcium carbonate, limestone powder, shell powder, quartz sand, glass fiber and sepiolite fiber.
Preferably, the lipophilic thermoplastic polymer is selected from one or more of polyethylene-vinyl acetate, polyethylene-butyl acrylate, polystyrene-butadiene-styrene, SBS, ethylene propylene diene monomer and styrene butadiene rubber.
Preferably, the mass ratio of the inert plugging material to the lipophilic thermoplastic polymer is (50-99) to (1-50).
Preferably, the temperature of the mixing is 60 ℃ to 300 ℃.
Preferably, the mixing time is 10min to 120min.
Preferably, the mixing method is mixing.
Preferably, the particle size of the lipophilic thermoplastic polymer is 1 μm to 5,000. Mu.m.
The invention provides the oleophylic inert material for plugging of the oil-based drilling fluid, which is prepared by the method in the technical scheme.
The invention uses oleophylic thermoplastic high polymer to modify the conventional inert plugging material through high-temperature blending, and the modified material still has the original plugging characteristic; the surface of the material adsorbs the lipophilic high polymer, and the lipophilic high polymer absorbs oil to expand and become sticky at the temperature of the leaking layer, has cohesiveness, can cohere rocks and leaking stoppage materials of the leaking layer, improves the staying property of the leaking stoppage materials and the stability of the plugging layer, effectively solves the problems of backflow, re-leakage and the like of the leaking stoppage materials, and has important significance for oil-based drilling leaking stoppage.
The invention is based on oleophylic modification of the surface of the plugging material, and mainly improves the acting force among the plugging material, the rock of the plugging layer and the plugging material through modification, thereby achieving the purpose of improving the retention capability of the plugging material and the stability of the plugging layer, and solving the problems of difficult retention, easy return and repeated leakage and the like of the plugging material. The method provided by the invention does not contain oleophilic monomers in the modification process, and has the advantages of simple equipment and preparation process, safety, environmental protection and convenience for large-scale production.
The product prepared by the invention is an inert plugging material with oleophylic modified surface, and a layer of oleophylic high polymer is adsorbed on the surface of the inert material; the main body is a conventional inert plugging material and still has the original plugging capability; the drilling fluid is solid at normal temperature, has small influence on the rheological property of the oil-based drilling fluid, and is convenient to pump to a leaking layer; under the temperature and pressure of a leakage layer, the polymer on the surface of the material absorbs oil and expands and slowly becomes sticky; the bonding surface of the plugging material can effectively bond rocks of a leaking layer, and the staying capacity is improved; the stability of the plugging layer is improved by self-bonding and bonding other plugging materials; the plugging material provided by the invention can effectively solve the problems of difficult residence of the conventional plugging material in an oil phase environment, poor stability of a plugging layer and the like, thereby solving the problems of backflow, repeated leakage and the like of the plugging material and meeting the plugging requirement of the oil-based drilling fluid.
Drawings
FIG. 1 is a photograph of a blocking layer taken out of a product prepared in example 1 of the present invention after blocking;
FIG. 2 is a picture of a plugging layer taken out after plugging of a product prepared in example 1 of the present invention after applying pressure;
fig. 3 is a graph showing the relationship between the pressure after plugging and the deformation of the plugging layer of the product prepared in example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be 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 examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention. In the examples, the methods used were all conventional methods unless otherwise specified.
The invention provides a preparation method of a lipophilic inert material for plugging an oil-based drilling fluid, which comprises the following steps:
and mixing the inert plugging material and the lipophilic thermoplastic polymer, and then processing and molding to obtain the lipophilic inert material for plugging the oil-based drilling fluid.
In the invention, the inert plugging material is preferably selected from one or more of calcium carbonate, limestone powder, shell powder, quartz sand, glass fiber and sepiolite fiber.
In the present invention, the lipophilic thermoplastic polymer is preferably one or more selected from the group consisting of polyethylene-vinyl acetate (EVA), polyethylene-butyl acrylate (EBA), polystyrene-butadiene-styrene (SBS), saturated SBS (SEBS), ethylene Propylene Diene Monomer (EPDM) and general Styrene Butadiene Rubber (SBR).
In the present invention, the particle size of the lipophilic thermoplastic polymer is preferably 1 μm to 5,000. Mu.m, more preferably 10 to 4000. Mu.m, more preferably 50 to 3000. Mu.m, more preferably 100 to 2000. Mu.m, more preferably 500 to 1500. Mu.m, more preferably 800 to 1200. Mu.m, and most preferably 1000. Mu.m.
In the invention, the mass ratio of the inert plugging material to the lipophilic thermoplastic polymer is preferably (50-99) to (1-50), more preferably (60-90): (5 to 40), more preferably (70 to 80): (10 to 30), most preferably 75:20.
in the present invention, the mixing is preferably performed under stirring; the mixing method is preferably mixing; the mixing temperature is preferably 60-300 ℃, more preferably 100-250 ℃, more preferably 150-200 ℃, and most preferably 160-180 ℃; the mixing time is preferably 10 to 120min, more preferably 20 to 100min, more preferably 50 to 80min, and most preferably 60 to 70min.
In the present invention, it is preferable that the mixture further comprises:
and cooling the mixed product, and processing and forming.
In the present invention, the temperature of the temperature reduction is preferably less than 60 ℃.
In the present invention, it is preferable that the above-mentioned processing and molding step is carried out by extrusion granulation, melt granulation, crushing granulation or the like, depending on the characteristics of the lipophilic thermoplastic polymer.
In the present invention, the particle size of the above-mentioned granules is preferably 160 to 600. Mu.m, more preferably 200 to 550. Mu.m, still more preferably 250 to 500. Mu.m, yet more preferably 300 to 450. Mu.m, most preferably 350 to 400. Mu.m.
In the invention, the product is preferably kept close to the shape of the inert plugging material in the process of processing and forming, and the invention aims to modify the surface of the inert material and keep the original shape of the inert material as much as possible.
In the invention, the preparation method of the oleophylic inert material for plugging the oil-based drilling fluid preferably comprises the following steps:
mixing the inert plugging material with oleophylic thermoplastic polymer, stirring at high temperature, adsorbing the polymer by the inert plugging material, cooling, and forming to obtain the plugging material with oleophylic surface.
In the invention, the preparation method of the oleophylic inert material for plugging the oil-based drilling fluid more preferably comprises the following steps:
adding lipophilic thermoplastic polymer powder or particles into a container;
adding inert plugging materials into the container, and fully stirring;
mixing the obtained mixture;
and cooling the mixed product, and processing and forming to obtain the surface oleophylic modified plugging material.
The invention provides the oleophylic inert material for plugging of the oil-based drilling fluid, which is prepared by the method in the technical scheme.
In the invention, the particle size of the oleophilic inert material for plugging the oil-based drilling fluid is preferably 160-600 μm, more preferably 200-550 μm, more preferably 250-500 μm, more preferably 300-450 μm, and most preferably 350-400 μm.
The main body of the oleophylic inert material provided by the invention is a conventional inert plugging material and still has the original plugging capability; the drilling fluid is solid at normal temperature, has small influence on the rheological property of the oil-based drilling fluid, and is convenient to pump to a leakage layer; under the temperature and pressure of a leakage layer, the polymer on the surface of the material absorbs oil and expands and slowly becomes sticky; the bonding surface of the plugging material can effectively bond rocks of a leaking layer, and the staying capacity is improved; the stability of the plugging layer is improved by self-bonding and bonding other plugging materials; the plugging material can effectively solve the problems of difficult residence, poor stability of a plugging layer and the like of the conventional plugging material in an oil phase environment, thereby solving the problems of backflow, re-leakage and the like of the plugging material and meeting the plugging requirement of the oil-based drilling fluid.
Example 1
30g of polyethylene-vinyl acetate (EVA) powder and 70g of calcium carbonate powder are fully stirred and uniformly mixed, then mixed for 10-20 min at 150 ℃, cooled and granulated, and the particle size is 160-600 mu m, thus obtaining the surface oleophylic modified calcium carbonate powder.
Example 2
Mixing 30g SBS and 70g limestone powder via stirring, milling at 180 deg.c for 10-20 min, cooling and forming to obtain surface lipophilic modified limestone powder of 160-600 micron size.
Example 3
And (2) fully and uniformly stirring 30g of Styrene Butadiene Rubber (SBR) and 70g of diatomite, mixing for 10-20 min at 180 ℃, cooling, and granulating to obtain the surface oleophylic modified diatomite with the particle size of 160-600 mu m.
Performance detection
(1) Evaluation of plugging Property
The product prepared by the embodiment of the invention is subjected to related performance evaluation, and the result is as follows:
oil-based drilling fluid (density 1.5 g/cm) 3 ): diesel oil (oil-water ratio =80: 20) +3wt% organic soil +3wt% primary emulsion (provided by Zhongpetrochemical Central plains engineering driller house) +3wt% secondary emulsion (provided by Zhongpetrochemical Central plains engineering driller house) + CaCl 2 Solution (mass concentration is 20%) + barite, aging for 16h at 150 ℃ for standby.
The formula of the plugging slurry comprises: oil-based drilling fluid plus the conventional inert lost circulation material with oleophilic and modified surface prepared in the example.
5g, 10g and 15g of the inert plugging material with oleophylic and modified surfaces prepared in the embodiment are respectively added into 200mL of oil-based drilling fluid, uniformly stirred, kept stand and sealed, and kept stand for 2 hours at the temperature of 80 ℃.
River sand of 20-40 meshes is adopted and dried for 0.5h at the temperature of 80 ℃. And (3) preheating a sand bed cylinder in advance, adding 15cm of preheated river sand, adding the plugging slurry while the sand bed cylinder is hot, pressurizing to 0.69MPa, and observing the plugging condition of the plugging slurry. To better illustrate the effect of the plugging material, unmodified calcium carbonate powder and limestone powder were used instead of the modified materials in the examples, respectively, and comparative experiments were performed, the results of which are shown in table 1.
Table 1 results of the product loss measurements made in the examples
As can be seen from Table 1, the modified plugging material prepared by the embodiment of the invention can effectively plug the pores in the sand bed, and has a good plugging effect. The plugging effect of the conventional plugging material is poor, which shows that the plugging performance of the plugging material can be effectively improved through oleophylic modification of the conventional plugging material.
(2) Evaluation of stability of plugging layer
The plugged layer was removed (oil based drilling fluid +10g of example 1) as shown in fig. 1, the change in the plugged layer was observed under pressure, and the plugged layer after 80% compression was shown in fig. 2; and the relationship between pressure and deformation of the sealant was recorded as shown in fig. 3.
As can be seen from the figures 1 and 2, the plugging layer containing the modified plugging material can be effectively bonded with river sand to form an integral plugging layer; under the action of external force, river sand particles in the plugging layer are not dispersed and still form a whole. The invention can effectively improve the stability of the plugging layer through oleophylic modification, thereby solving the problems of return discharge, repeated leakage and the like of the oil-based drilling fluid plugging material.
According to the embodiment, the main body of the product provided by the invention is a conventional inert plugging material and still has the original plugging capability; the drilling fluid is solid at normal temperature, has small influence on the rheological property of the oil-based drilling fluid, and is convenient to pump to a leakage layer; under the temperature and pressure of a leakage layer, the high polymer on the surface of the material absorbs oil and expands and slowly becomes sticky; the bonding surface of the plugging material can effectively bond rocks of a leaking layer, and the staying capacity is improved; the stability of the plugging layer is improved by self-bonding and bonding other plugging materials; the plugging material can effectively solve the problems of difficult residence, poor stability of a plugging layer and the like of the conventional plugging material in an oil phase environment, thereby solving the problems of backflow, re-leakage and the like of the plugging material and meeting the plugging requirement of the oil-based drilling fluid.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A preparation method of an oleophylic inert material for plugging an oil-based drilling fluid comprises the following steps:
and mixing the inert plugging material and the lipophilic thermoplastic polymer, and then processing and molding to obtain the lipophilic inert material for plugging the oil-based drilling fluid.
2. The method according to claim 1, wherein the inert lost circulation material is selected from one or more of calcium carbonate, limestone powder, shell powder, quartz sand, glass fiber and sepiolite fiber.
3. The method of claim 1, wherein said lipophilic thermoplastic polymer is selected from one or more of polyethylene-vinyl acetate, polyethylene-butyl acrylate, polystyrene-butadiene-styrene, SBS, ethylene propylene diene monomer and styrene butadiene rubber.
4. The method as claimed in claim 1, wherein the mass ratio of the inert plugging material to the lipophilic thermoplastic polymer is (50-99) to (1-50).
5. The method of claim 1, wherein the temperature of the mixing is 60 ℃ to 300 ℃.
6. The method of claim 1, wherein the mixing time is 10min to 120min.
7. The method of claim 1, wherein the method of mixing is compounding.
8. The method according to claim 1, wherein the particle size of the lipophilic thermoplastic polymer is 1 μm to 5,000 μm.
9. The oleophilic inert material for plugging of the oil-based drilling fluid, which is prepared by the method of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111027489.8A CN115746804A (en) | 2021-09-02 | 2021-09-02 | Oleophylic inert material for oil-based drilling fluid plugging and preparation method thereof |
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| CN202111027489.8A CN115746804A (en) | 2021-09-02 | 2021-09-02 | Oleophylic inert material for oil-based drilling fluid plugging and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634898A (en) * | 2015-07-15 | 2017-05-10 | 中国石油化工股份有限公司 | Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof |
| CN107987807A (en) * | 2017-11-28 | 2018-05-04 | 中国石油集团渤海钻探工程有限公司 | Shell core formula oil base drilling fluid leak stopping bridge formation particle and preparation method thereof |
| CN108219332A (en) * | 2017-12-29 | 2018-06-29 | 中海石油(中国)有限公司湛江分公司 | A kind of oil suction expanding material and its preparation method and application |
| CN111849431A (en) * | 2020-07-29 | 2020-10-30 | 长江大学 | Composite plugging material for well drilling and application thereof |
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2021
- 2021-09-02 CN CN202111027489.8A patent/CN115746804A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634898A (en) * | 2015-07-15 | 2017-05-10 | 中国石油化工股份有限公司 | Drill-feeding plugging agent used for oil-based drilling fluid, preparation method and application thereof |
| CN107987807A (en) * | 2017-11-28 | 2018-05-04 | 中国石油集团渤海钻探工程有限公司 | Shell core formula oil base drilling fluid leak stopping bridge formation particle and preparation method thereof |
| CN108219332A (en) * | 2017-12-29 | 2018-06-29 | 中海石油(中国)有限公司湛江分公司 | A kind of oil suction expanding material and its preparation method and application |
| CN111849431A (en) * | 2020-07-29 | 2020-10-30 | 长江大学 | Composite plugging material for well drilling and application thereof |
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