CN110819322B - Special high-filtration-loss plugging agent for oil-based drilling fluid - Google Patents
Special high-filtration-loss plugging agent for oil-based drilling fluid Download PDFInfo
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- 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
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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Abstract
The invention discloses a special high-filtration-loss plugging agent for oil-based drilling fluid, which comprises the following components in parts by weight: 5-10 parts of fiber, 40-70 parts of porous inert material, 10-25 parts of percolation material and 5-10 parts of filter aid. The porous inert material is a mixture of ceramic powder with the grain size of 180 meshes and ceramic powder with the grain size of 250 meshes; the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is (4-6) to (3-5). The percolation material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes, and the weight ratio of the 100-mesh zeolite powder to the 150-mesh zeolite powder is (2-4) to (4-7). The fiber is polyamide fiber, the length-diameter ratio is 5-50: 1, and the diameter is 0.5-15 um. The filter aid is lime powder with the particle size of 200 meshes. The components are uniformly mixed to obtain the special high-filtration-loss plugging agent for the oil-based drilling fluid. The plugging agent is prepared by mixing various materials such as fibers, porous inert materials, percolation materials, filter aids and the like, and has the advantages of wide application range, simple plugging construction, high safety and quick response.
Description
Technical Field
The invention relates to the technical field of petroleum drilling engineering, in particular to a high-filtration leakage plugging agent special for oil-based drilling fluid.
Background
In recent years, shale gas development is developed rapidly in China, but in view of the stability problem of shale formations, most of shale gas drilling wells adopt an oil-based drilling fluid system, so that the oil-based drilling fluid system is popularized and applied in a large area in shale gas drilling wells, the shale formations have the main characteristics of universal development of microcracks and leakage caused by induced fracturing, but in the using process of the oil-based drilling fluid system, the leakage of the oil-based drilling fluid is frequently generated. Due to the high preparation cost of the oil-based drilling fluid, the leakage of the oil-based drilling fluid inevitably causes great material waste, delays the drilling period and causes great economic loss. Therefore, the development of the oil-based drilling fluid plugging agent is a problem which is urgently needed to be solved in the popularization and application of the shale gas-oil-based drilling fluid at present.
At present, a lot of plugging agents are used for water-based drilling fluids, but the plugging agents are few in variety and suitable for oil-based drilling fluid plugging agents, and the basic requirements of the oil-based drilling fluid plugging agent are that the oil-based drilling fluid plugging agent has good compatibility with the oil-based drilling fluid, good plugging effect on high-permeability and micro-fracture stratums and high pressure-bearing capacity.
The high-fluid loss plugging agent is a novel plugging material developed in recent decades, is similar to a DIASEALM plugging agent in the United states, various high-fluid loss plugging agents in China and the like. Although the types of the rapid fluid loss plugging agents are more, the action mechanisms of the rapid fluid loss plugging agents are different from each other. In the process of producing zone plugging, the acid solubility of the existing oil-based high-fluid-loss plugging agent is about 60 percent, and compared with a water-based high-fluid-loss plugging agent, the acid solubility is relatively low. The quick fluid loss plugging agent is popular on site due to the characteristics of convenient use, quick response, high success rate, wide application range and the like, but can only be used for water-based drilling fluid and is lack of a special high fluid loss plugging agent for oil-based drilling fluid.
Disclosure of Invention
The invention aims to provide a special high-filtration-loss plugging agent for oil-based drilling fluid, aiming at the current situation that the prior art lacks a special high-filtration-loss plugging agent for the oil-based drilling fluid.
The invention provides a special high-filtration-loss plugging agent for oil-based drilling fluid, which comprises the following components in parts by weight: 5-10 parts of fiber, 40-70 parts of porous inert material, 10-25 parts of percolation material and 5-10 parts of filter aid.
Wherein the porous inert material is a mixture of 180-mesh ceramic powder and 250-mesh ceramic powder with the particle size of 4-6: 3-5 by weight. The porous inert material has the function of providing certain strength and the aim of filtering diesel base fluid.
The percolation material is a mixture of zeolite powder with the particle size of 100 meshes and 150 meshes in a weight ratio of (2-4) to (4-7). The effect of the percolating material is to render the solid phase non-filterable and the liquid phase fluid-loss.
The fiber is polyamide fiber, the length-diameter ratio is 5-50: 1, the diameter is 0.5-15 um, and the temperature resistance of the fiber can reach 160 ℃ at most. The monomer material can be effectively dispersed in diesel oil-based liquid to achieve the effects of suspending inert particles and weighting agent; as a plugging material, the plugging material has the functions of hanging a resistance bridge after entering a leaking layer, drawing channels to enhance the effect and improving the plugging pressure bearing capacity.
The filter aid is lime powder with the particle size of 200 meshes and has the function of helping the liquid phase to achieve the function of rapid filtration.
Preferably, the special high-fluid-loss plugging agent for the oil-based drilling fluid comprises the following components in parts by weight: 8 parts of fiber, 50 parts of porous inert material, 15 parts of percolating material and 10 parts of filter aid; the porous inert material is a mixture of 180-mesh ceramic powder and 250-mesh ceramic powder according to a weight ratio of 5: 4; the percolation material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes according to the weight ratio of 3: 5. The components are uniformly mixed to obtain the plugging agent.
Preferably, the special high-fluid-loss plugging agent for the oil-based drilling fluid comprises the following components in parts by weight: 10 parts of polyamide fiber, 60 parts of porous inert ceramic powder, 20 parts of zeolite powder and 10 parts of lime powder; wherein, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 6: 4; in the zeolite powder, the weight ratio of 100-mesh zeolite powder to 150-mesh zeolite powder is 4: 6. The components are uniformly mixed to obtain the plugging agent.
The action mechanism of the oil-based special high-fluid-loss plugging agent disclosed by the invention is as follows: the method is characterized in that diesel oil is used as a base liquid to prepare leakage stopping slurry, after the leakage stopping slurry enters a leakage stratum, the leakage stopping slurry is quickly filtered under the action of the pressure difference between the drilling fluid column pressure and the stratum pressure, a plug is quickly formed in a stratum crack and is continuously compacted under the action of the pressure difference, so that high blocking strength can be formed, a leakage passage is effectively plugged, and the stratum pressure-bearing capacity is improved; meanwhile, the formed plugging layer has a certain microporous structure and integral filling characteristics, and the drilling fluid contains a plurality of solid-phase substances and cannot penetrate through the layer, but the drilling fluid can be subjected to filtration loss, so that a thin and compact mud cake is formed on the layer surface, and the effect of plugging a leakage channel is further achieved. The method can solve the problems of leakage, partial leakage and multi-point well leakage. Moreover, the oil-based high-filtration leakage plugging agent is prepared by mixing various materials such as fibers, porous inert materials, percolation materials, filter aids and the like, and has the advantages of wide application range, simple leakage plugging construction, high safety and quick response.
Compared with the prior art, the invention has the advantages that:
the solid phase particles in the invention have small sizes and can easily enter leakage channels and spaces with various opening sizes. Under the action of the pressure difference, the leakage is rapid, and the more serious the leakage is, the faster the leakage is.
Solid-phase substances in the leaking stoppage slurry are precipitated, stacked and crosslinked to form a filter cake, and then the filter cake is compacted to fill a leakage passage and form a sticky anti-shearing structure with the wall surface of a pore gap, so that the effect of slowing leakage is achieved; meanwhile, the formed blockage has a high-permeability microporous structure and an integral filling characteristic, so that the blockage can ventilate and permeate water, but can not permeate drilling fluid, just like homogeneous seamless low-pore sandstone formed in natural geology, and the drilling fluid is quickly lost on the formed plug surface to form a smooth and flat filter cake, thereby playing the effect of further tightly plugging a leakage channel.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
A high-filtration-loss plugging agent special for oil-based drilling fluid comprises the following components in percentage by weight: 10g of polyamide fiber, 60g of porous inert ceramic powder, 20g of zeolite powder and 10g of lime powder. Wherein, in the ceramic powder, the weight ratio of 180-mesh ceramic powder to 250-mesh ceramic powder is 6: 4; in the zeolite powder, the weight ratio of 100-mesh zeolite powder to 150-mesh zeolite powder is 4: 6. The components are uniformly mixed to obtain the plugging agent.
Example 2
A high-filtration-loss plugging agent special for oil-based drilling fluid comprises the following components in percentage by weight: 5g of polyamide fiber, 65g of porous inert ceramic powder, 20g of zeolite powder and 10g of lime powder. Wherein, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 6: 5; in the zeolite powder, the weight ratio of 100-mesh zeolite powder to 150-mesh zeolite powder is 4: 7. The components are uniformly mixed to obtain the plugging agent.
Example 3
A high-filtration-loss plugging agent special for oil-based drilling fluid comprises the following components in percentage by weight: 10g of polyamide fiber, 55g of porous inert ceramic powder, 25g of zeolite powder and 10g of lime powder; wherein, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 2: 1; in the zeolite powder, the weight ratio of 100-mesh zeolite powder to 150-mesh zeolite powder is 1: 1. The components are uniformly mixed to obtain the plugging agent.
Example 4
A high-filtration-loss plugging agent special for oil-based drilling fluid comprises the following components: 8g of fibre, 50g of porous inert material, 15g of percolating material, 10g of filter aid; the porous inert material is a mixture of 180-mesh ceramic powder and 250-mesh ceramic powder according to a weight ratio of 5: 4; the percolation material is a mixture of zeolite powder with the particle size of 100 meshes and 150 meshes according to the weight ratio of 2: 7. The components are uniformly mixed to obtain the plugging agent.
Example 5
A high-filtration-loss plugging agent special for oil-based drilling fluid comprises the following components: 10g of fibres, 60g of porous inert material, 10g of percolating material, 5g of filter aid; the porous inert material is a mixture of 180-mesh ceramic powder and 250-mesh ceramic powder according to a weight ratio of 4: 5; the percolation material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes according to the weight ratio of 1: 2. The components are uniformly mixed to obtain the plugging agent.
The plugging agent of the embodiment 1-5 is selected for performance test, and the imported plugging agent Diaseal-M is selected as a comparison sample. Respectively preparing the plugging agent and the Diaseal-M of the embodiments 1-5 and diesel into plugging slurry, wherein the preparation steps are as follows;
(1) respectively measuring 6 cups of 260ml diesel oil, and placing on a high-speed stirrer; 78g of each of the samples prepared in examples 1-5 and the imported plugging agent Diaseal-M was weighed for use.
(2) Starting a stirrer, adding 6 plugging agents into 6 cups of diesel oil respectively at 11000rpm, stirring for 20min, and scraping off adhesive substances adhered to the cup wall by using a glass rod.
The prepared plugging slurry sample is subjected to the following tests:
1. rapid fluid loss test
The sample was stirred well and poured into a dry, clean medium pressure loss filter slurry cup, the loss filter slurry cup lid was closed, and a 500ml beaker was placed at the lower exit of the loss filter to receive the filtrate. Adjusting the gas source to 0.7MPa, immediately opening the gas inlet valve, starting timing at the same time, stopping timing immediately until gas is sprayed out of the discharge port, and recording the filtration time.
2. Penetration test
After the rapid fluid loss, the formed plug is directly placed on a base of a cement standard consistency setting time tester, a test needle with the diameter of 1.13mm +/-0.05 mm and the length of 50mm +/-1 mm for initial setting is installed, a tightening screw is adjusted, a needle head just touches the surface of a filter cake, the screw is tightened by an adjusting test rod, the screw is just aligned to the position of a graduated scale 0, the tightening screw is loosened, and a scale value is read after the test needle is stabilized, namely the penetration degree. The results are shown in Table 1.
TABLE 1 oil-based high fluid loss plugging agent fluid loss time and penetration test
As can be seen from Table 1, Diaseal-M takes longer in the API fluid loss process, and the formed mud cake is soft and crumbled and not dense enough. In examples 1 to 5, the filtration rate in the API filtration process was fast, and the filter cake formed was dense, regular and had a certain initial strength.
3. Oil-based drilling fluid compatibility test
The formula of the oil-based drilling fluid comprises the following components: 240ml of 0# diesel oil, 7.2g of organic soil, 6.2ml of polyesteramide serving as a main emulsifier (AT-PMU), 4ml of modified fatty acid serving as an auxiliary emulsifier (AT-SMU), 3.6ml of wetting agent (AT-WET), 4g of calcium oxide, 60ml of 25 percent calcium chloride solution and barite powder (the density is increased to 1.60 g/cm)3)。
The preparation method of the oil-based drilling fluid comprises the following steps: measuring 240ml of 0# diesel oil, adding the 0# diesel oil into a preparation container, starting stirring, setting the rotating speed to 11000rpm, adding 7.2g of organic soil under high-speed stirring, and stirring for 10 min; then using a syringe to extract 6.2ml of main emulsifier AT-PMU, 4ml of auxiliary emulsifier AT-SMU and 3.6ml of wetting agent AT-WET, sequentially adding the mixture into a preparation container, then adding 4g of calcium oxide, adding the mixture under high-speed stirring, stirring for 30min, then adding 60ml of 25% calcium chloride solution, stirring for 30min under high-speed stirring, and finally slowly adding barite powder until the system density is 1.60g/cm3Stirring for 30min, and measuring density with densimeter to obtain measured density of 1.60g/cm3And obtaining the base slurry of the oil-based drilling fluid. Table 2 is the range of performance data requirements for oil-based drilling fluids.
TABLE 2 oil-based drilling fluid Performance data requirement Range
Respectively measuring 7 parts of the oil-based drilling fluid prepared by the method, wherein each 400ml of the oil-based drilling fluid is prepared by the method, starting a high-speed stirrer, and adjusting the rotating speed to 11000 rpm; 16g of each of the oil-based high-filtration loss plugging agent and the imported plugging agent Diaseal-M prepared in the embodiments 1-5 is weighed respectively, and is added into 6 parts of oil-based drilling fluid respectively under a stirring state, the rest 1 part of oil-based drilling fluid is used as a blank sample, the stirring is carried out for 10min, after the stirring is finished, 7 parts of samples are poured into an aging tank respectively, the aging tank is placed into a roller furnace, the aging is carried out for 16h at 150 ℃, then the performance of the oil-based high-filtration loss plugging agent and the imported plugging agent Diaseal-M is tested, and the test results are shown in Table 3. In the table, the rheology was measured using a constant temperature heating mantle temperature controlled at 50 ℃.
TABLE 3 Performance test of oil-based drilling fluids after aging
As seen from the test data in table 3, the rheological property of the entire oil-based drilling fluid is less affected after the oil-based high fluid loss plugging agent is added; after the Diaseal-M is added into the oil-based drilling fluid, the demulsification voltage is obviously reduced, and the rheological property is increased.
In conclusion, the high-filtration-loss plugging agent special for the oil-based drilling fluid has various performances which are obviously superior to those of imported plugging agent Diaseal-M, achieves unexpected technical effects, and is a plugging agent special for the oil-based drilling fluid.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The high-filtration-loss plugging agent special for the oil-based drilling fluid is characterized by comprising the following components in parts by weight: 5-10 parts of fiber, 40-70 parts of porous inert material, 10-25 parts of percolating material and 5-10 parts of filter aid; the porous inert material is a mixture of ceramic powder with the grain size of 180 meshes and ceramic powder with the grain size of 250 meshes; the percolation material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes; the fibers are polyamide fibers, the length-diameter ratio is 5-50: 1, and the diameter is 0.5-15 mu m; in the percolation material, the weight ratio of 100-mesh zeolite powder to 150-mesh zeolite powder is (2-4) to (4-7); the filter aid is lime powder with the particle size of 200 meshes.
2. The special high-filtration-loss plugging agent for the oil-based drilling fluid as claimed in claim 1, wherein the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder in the porous inert material is (4-6) to (3-5).
3. The special high fluid loss plugging agent for the oil-based drilling fluid as claimed in claim 2, which comprises the following components in parts by weight: 8 parts of fiber, 50 parts of porous inert material, 15 parts of percolating material and 10 parts of filter aid; the porous inert material is a mixture of 180-mesh ceramic powder and 250-mesh ceramic powder according to a weight ratio of 5: 4; the percolation material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes according to the weight ratio of 3: 5.
4. The special high fluid loss plugging agent for the oil-based drilling fluid as claimed in claim 2, which comprises the following components in parts by weight: 10 parts of fiber, 60 parts of porous inert ceramic powder, 20 parts of percolation material and 10 parts of filter aid; wherein, in the ceramic powder, the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is 6: 4; in the percolating material, the weight ratio of 100 mesh zeolite powder to 150 mesh zeolite powder is 4: 6.
5. The special high-fluid-loss plugging agent for the oil-based drilling fluid as claimed in any one of claims 1 to 4, wherein the plugging agent is obtained by uniformly mixing all the components.
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| CN111218260B (en) * | 2020-03-06 | 2021-02-26 | 中国石油大学(华东) | High-temperature-resistant high-oil-absorption resin particle plugging agent suitable for oil-based drilling fluid and preparation method thereof |
| CN114426811B (en) * | 2020-09-18 | 2023-08-29 | 中国石油化工股份有限公司 | High-fluid loss plugging agent for drilling fluid |
| CN112375547A (en) * | 2020-12-02 | 2021-02-19 | 台前县天宏化工有限公司 | Micro-nano rigid resin anti-collapse plugging agent |
| CN114276791B (en) * | 2021-12-14 | 2023-07-25 | 成都西油华巍科技有限公司 | High-fluid loss plugging agent for oil-based drilling fluid |
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