CN109913186B - Petroleum drilling auxiliary and preparation method thereof - Google Patents
Petroleum drilling auxiliary and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an oil drilling aid which comprises the following components in parts by mass: 80-100 parts of modified humic acid, 20-30 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10-15 parts of maleic anhydride acylated chitosan, 5-10 parts of modified potassium hexatitanate whisker, 1-2 parts of surfactant and 500 parts of water 400-. The invention also provides a preparation method of the petroleum drilling auxiliary agent. The modified humic acid and the 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid in the formula can be used in a matched mode, the synergistic effect is achieved, the high temperature resistance and salt resistance effects of the filtrate reducer are improved, the modified potassium hexatitanate whisker is particularly excellent in high temperature resistance, and the dosage of the filtrate reducer in drilling fluid can be reduced. The petroleum drilling auxiliary agent disclosed by the invention has the functions of resisting high temperature of 260 ℃ and resisting saturated saline water, can effectively reduce the filtration loss of drilling fluid, and has a wide application prospect.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation assistants, and particularly relates to a petroleum drilling assistant and a preparation method thereof.
Background
the filtrate reducer is one of the most important additives in petroleum drilling, and plays an important role in maintaining stable performance of drilling fluid and safely and efficiently drilling. The process that free water in drilling fluid permeates to stratum under the action of pressure difference is called fluid loss, and the overlarge fluid loss often brings about a plurality of adverse results to drilling work, for example, mud cakes generated by high fluid loss can be attached to a well wall, the hydraulic diameter of a well hole and a drilling tool annular space is reduced, drilling sticking accidents are easy to occur, and in order to solve the problems that blowout, well leakage, well collapse and the like can be induced by high pumping pressure used by drilling sticking. In addition, water that penetrates the formation after fluid loss can also cause clay particles to swell and migrate, resulting in plugging of the producing formation, thereby reducing oil production. Therefore, when oil is exploited, a fluid loss additive needs to be added into the drilling fluid to reduce the fluid loss of the drilling fluid.
The natural polymer fluid loss additive such as humic acid, cellulose, lignin, starch and the like is widely applied to oil exploitation due to low price and wide sources, but along with gradual deepening of a well in oil exploitation and frequent occurrence of high-temperature and high-salt reservoirs, the natural polymer fluid loss additive generally does not have the functions of high temperature resistance and salt resistance, so that the application range of the natural polymer fluid loss additive is limited. In order to improve the situation, some researchers add other temperature-resistant and salt-resistant additives into the natural polymer filtrate reducer to improve the quality of the mud cake of the drilling fluid and reduce the high-temperature and high-pressure filtrate loss, but the additives are difficult to simultaneously achieve the effects of temperature resistance and salt resistance, and in order to simultaneously achieve the effects of temperature resistance and salt resistance, the types and the amount of the additives required to be added are large, so that the complexity of the underground situation is increased, the occurrence probability of dangerous accidents is increased, and the petroleum yield is reduced. Therefore, in order to solve the above problems, it is necessary to develop a new high temperature resistant and salt resistant filtrate reducer.
Disclosure of Invention
The invention provides a petroleum drilling aid, which solves the problems of poor high-temperature resistance and poor salt resistance of a natural polymer filtrate reducer in the prior art.
The invention aims to provide an oil drilling auxiliary agent, which consists of the following components in parts by weight: 80-100 parts of modified humic acid, 20-30 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10-15 parts of maleic anhydride acylated chitosan, 5-10 parts of modified potassium hexatitanate whisker, 1-2 parts of surfactant and 500 parts of water 400-;
Wherein, the modified humic acid is obtained by modifying humic acid with polyacrylic acid and silane coupling agent;
The modified potassium hexatitanate crystal whisker is obtained by modifying potassium hexatitanate crystal with silane coupling agent.
Preferably, the petroleum drilling aid consists of the following components in parts by weight: 90 parts of modified humic acid, 25 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10 parts of maleic anhydride acylated chitosan, 10 parts of modified potassium hexatitanate whisker, 1 part of surfactant and 450 parts of water.
Preferably, the humic acid is fulvic acid. Fulvic acid is a large group of humic acids, has excellent performance, is soluble in acid, alkali and water, contains various functional groups such as carboxyl, phenolic hydroxyl, methoxyl, sulfonic group, amino and the like, and is often used as a fluid loss additive in petroleum drilling. However, natural fulvic acid including other humic acids has poor thermal stability, and is easy to decarboxylate, dehydroxy, crack and the like at high temperature, so that the original activity of the fulvic acid is lost, and therefore, the fulvic acid is modified in order to improve the heat resistance of the fulvic acid.
Preferably, the modified potassium hexatitanate whiskers have a diameter of 0.2-1.0 micrometer and a length of 8-12 micrometers.
Preferably, the surfactant is nonylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether.
The second purpose of the invention is to provide a preparation method of the petroleum drilling auxiliary agent, which comprises the following steps:
Step 1, preparation of modified humic acid
Dissolving polyacrylic acid in ethanol to obtain a solution A; adding a silane coupling agent A into the solution A, and uniformly mixing to obtain a solution B; adding humic acid into the solution B, uniformly dispersing by ultrasonic, heating to 60-80 ℃, reacting for 4-5h under the condition of stirring, filtering after the reaction is finished, and drying to obtain the modified humic acid;
wherein the mass ratio of the polyacrylic acid to the silane coupling agent A to the humic acid to the ethanol is 1-2: 2: 20: 100, respectively;
step 2, preparing modified potassium hexatitanate whisker
Mixing and dissolving a silane coupling agent B and ethanol according to the mass ratio of 1:20 to obtain a solution C; mixing potassium hexatitanate whiskers with ethanol according to a mass ratio of 1:10, and performing ultrasonic dispersion to obtain a suspension; dropwise adding the solution C into the suspension under the stirring condition, reacting at 60 ℃ for 1-2h after dropwise adding is finished, and then filtering and drying the reaction liquid to obtain the modified potassium hexatitanate whisker;
Wherein the mass ratio of the silane coupling agent B to the potassium hexatitanate whisker is 1: 20-30 parts of;
step 3, weighing 80-100 parts of modified humic acid, 20-30 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10-15 parts of maleic anhydride acylated chitosan, 5-10 parts of modified potassium hexatitanate whisker, 1-2 parts of surfactant and 500 parts of water 400-;
And 4, mixing the modified humic acid, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, maleic anhydride acylated chitosan, modified potassium hexatitanate whisker, a surfactant and water weighed in the step 3, dispersing at a high speed, and obtaining the petroleum drilling aid after the dispersion is finished.
preferably, the silane coupling agent A and the silane coupling agent B are both a silane coupling agent KH 550.
Preferably, the ultrasonic dispersion conditions in step 1 and step 2 are both: dispersing for 30min under the condition of ultrasonic power of 300W; the stirring conditions in the step 1 and the step 2 are both 500 r/min.
preferably, the high-speed dispersion rotating speed in the step 4 is 1000-1500r/min, and the dispersion time is 15-30 min.
Compared with the prior art, the invention has the beneficial effects that:
1) The modified fulvic acid is added in the formula, the fulvic acid has a plurality of functional groups on the molecules, but has poor heat and salt resistance, so that the fulvic acid is modified by adopting polyacrylic acid and a silane coupling agent to improve the heat and salt resistance of the fulvic acid; the silane coupling agent modified fulvic acid is grafted with an Si-OR group which is easy to hydrolyze into Si-OH, and the surface of clay particles in the drilling fluid is rich in Si-OH, so that the Si-OH on the fulvic acid and the Si-OH on the surface of the clay particles are condensed to form a firm Si-O-Si bond, and the fulvic acid molecules are firmly adsorbed on the clay particles; in addition, the bond energy of the Si-O-Si bond is extremely high, and the bond is not easy to be broken under the influence of high temperature and high salt, so that the modified fulvic acid has good heat resistance and salt resistance;
After fulvic acid is modified by polyacrylic acid, carboxyl in the polyacrylic acid can be combined with functional groups in the fulvic acid to form macromolecules with a space grid structure, and when the modified fulvic acid is used as a filtrate reducer applied to drilling fluid, clay particles can be adsorbed onto molecular chains of the grid structure to block linear motion of the clay particles, so that the clay particles are difficult to contact with each other and bond; in addition, the net structure adhered with the clay particles can further form a net structure which is distributed in the whole system through bridging among the clay particles, and the space position is stabilized.
2) 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid is added in the formula, the hydroxy and acetamido groups in the 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid can strongly adsorb clay, and the naphthalene sulfonic group can produce strong hydration action to form a hydration layer on the surface of clay particles and also improve the f potential of the clay particles, thereby increasing the stability of the clay particles; meanwhile, the 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid contains a sulfonic group insensitive to salt and an acetamido group capable of inhibiting decarboxylation, dehydroxylation and cracking of fulvic acid under a high-temperature condition, so that the fulvic acid can further keep the original activity under the high-temperature and high-salt conditions.
3) The modified potassium hexatitanate whisker is added in the formula, is a high-heat-resistant substance, can resist high temperature under the condition of extremely small using amount, can further improve the heat resistance of the filtrate reducer when used in the system, and can also reduce the adding amount of other filtrate reducer raw materials such as fulvic acid; the potassium hexatitanate whisker can be stably dispersed in a system after being modified by a silane coupling agent, so that the self-agglomeration phenomenon is avoided, and an organic group is introduced after being modified by the silane coupling agent, so that the bonding strength between the potassium hexatitanate whisker and clay particles is greatly improved, and the potassium hexatitanate whisker can be adsorbed on the surface of the clay particles to form an adsorption layer so as to prevent the clay particles from being flocculated and enlarged; on the other hand, the potassium hexatitanate whisker can also stabilize the fine particles detached under the action of the circulating stirring of the drilling fluid by adsorption and does not adhere to the fine particles to form large particles.
4) The formula of the invention is added with maleic anhydride acylation chitosan, and the effect of the maleic anhydride acylation chitosan is that macromolecules obtained by modifying fulvic acid with polyacrylic acid are easy to stretch, so that a space grid structure can be formed in a system.
5) The petroleum drilling auxiliary prepared by the invention has the functions of resisting high temperature of 260 ℃ and saturated saline water, can effectively reduce the addition amount of the fluid loss additive in drilling fluid and reduce the fluid loss of drilling mud, and has wide application prospect.
Detailed Description
In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.
The test methods not specifically mentioned in the following examples were carried out according to the conventional methods and conditions in the art, and the starting materials were all commercially available unless otherwise specified.
It should be noted that the preparation method of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid in the present invention is made with reference to "research on synthesis of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid" published by Baijie 2012 on fuel and dye volume 49, No. 6.
The preparation method of the maleic anhydride acylated chitosan is made by referring to a paper of synthesis of maleic anhydride acylated chitosan, published in 2005 by Sunxi Branch, on the chemical research and application No. 17, No. 2.
Example 1
The petroleum drilling auxiliary agent comprises the following components in parts by weight: 90g of modified humic acid, 25g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10g of maleic anhydride acylated chitosan, 10g of modified potassium hexatitanate whisker with the diameter of 0.2 micron and the length of 8 microns, 1g of nonylphenol polyoxyethylene ether and 450g of water;
The preparation method comprises the following steps:
step 1, preparation of modified humic acid
Dissolving 1g of polyacrylic acid in 100g of ethanol to obtain a solution A; adding 2g of silane coupling agent KH550 into the solution A, and uniformly mixing to obtain solution B; adding 20g of fulvic acid into the solution B, performing ultrasonic treatment for 30min under the power of 300W, uniformly dispersing, heating to 60 ℃, reacting for 5h at the stirring speed of 500r/min, filtering after the reaction is finished, and drying filter residues for 5h at the temperature of 60 ℃ to obtain modified humic acid;
Step 2, preparing modified potassium hexatitanate whisker
Mixing and dissolving 1g of silane coupling agent KH550 and 20g of ethanol to obtain solution C; mixing 20g of potassium hexatitanate whisker and 200g of ethanol, and ultrasonically dispersing for 30min under the ultrasonic power of 300W to obtain a suspension; dropwise adding the solution C into the suspension at a stirring speed of 500r/min, wherein the dropwise adding speed is 10ml/min, reacting at 60 ℃ for 1h after the dropwise adding is finished, filtering the reaction solution, and drying filter residues at 80 ℃ for 5h to obtain modified potassium hexatitanate whiskers;
Step 3, weighing 90g of modified humic acid, 25g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10g of maleic anhydride acylated chitosan, 10g of modified potassium hexatitanate whisker, 1g of nonylphenol polyoxyethylene ether and 450g of water according to parts by weight;
And 4, mixing the modified humic acid, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, maleic anhydride acylated chitosan, modified potassium hexatitanate whisker, nonylphenol polyoxyethylene ether and water weighed in the step 3, dispersing at a high speed of 1000r/min for 30min, and obtaining the petroleum drilling aid after the dispersion is finished.
Example 2
The petroleum drilling auxiliary agent comprises the following components in parts by weight: 80g of modified humic acid, 20g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 12g of maleic anhydride acylated chitosan, 5g of modified potassium hexatitanate whisker with the diameter of 1.0 micron and the length of 10 microns, 1.5g of octylphenol polyoxyethylene ether and 400g of water;
The preparation method comprises the following steps:
Step 1, preparation of modified humic acid
Dissolving 1.5g of polyacrylic acid in 100g of ethanol to obtain a solution A; adding 2g of silane coupling agent KH550 into the solution A, and uniformly mixing to obtain solution B; adding 20g of fulvic acid into the solution B, performing ultrasonic treatment for 30min under the ultrasonic power of 300w, uniformly dispersing, heating to 70 ℃, reacting for 4.5h at the stirring speed of 500r/min, filtering after the reaction is finished, and drying for 5h at 60 ℃ to obtain modified humic acid;
step 2, preparing modified potassium hexatitanate whisker
mixing and dissolving 1g of silane coupling agent KH550 and 20g of ethanol to obtain solution C; mixing 25g of potassium hexatitanate whisker with 250g of ethanol, and ultrasonically dispersing for 30min under the ultrasonic power of 300W to obtain a suspension; dropwise adding the solution C into the suspension at a stirring speed of 500r/min, wherein the dropwise adding speed is 10ml/min, reacting at 60 ℃ for 1.5h after the dropwise adding is finished, filtering the reaction solution, and drying filter residues at 80 ℃ for 5h to obtain modified potassium hexatitanate whiskers;
Step 3, weighing 80g of modified humic acid, 20g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 12g of maleic anhydride acylated chitosan, 5g of modified potassium hexatitanate whisker, 1.5g of octylphenol polyoxyethylene ether and 400g of water according to parts by weight;
and 4, mixing the modified humic acid, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, maleic anhydride acylated chitosan, modified potassium hexatitanate whisker, octylphenol polyoxyethylene ether and water weighed in the step 3, dispersing at a high speed of 1200r/min for 20min, and obtaining the petroleum drilling aid after the dispersion is finished.
Example 3
the petroleum drilling auxiliary agent comprises the following components in parts by weight: 100g of modified humic acid, 30g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 15g of maleic anhydride acylated chitosan, 8g of modified potassium hexatitanate whisker with the diameter of 0.6 micron and the length of 12 microns, 2g of nonylphenol polyoxyethylene ether and 500g of water;
The preparation method comprises the following steps:
step 1, preparation of modified humic acid
Dissolving 2g of polyacrylic acid in 100g of ethanol to obtain a solution A; adding 2g of silane coupling agent KH550 into the solution A, and uniformly mixing to obtain solution B; adding 20g of fulvic acid into the solution B, performing ultrasonic treatment for 30min under the ultrasonic power of 300W, uniformly dispersing, heating to 80 ℃, reacting for 4h under the stirring condition, filtering after the reaction is finished, and drying filter residues for 5h at the temperature of 60 ℃ to obtain modified humic acid;
Step 2, preparing modified potassium hexatitanate whisker
Mixing and dissolving 1g of silane coupling agent KH550 and 20g of ethanol to obtain solution C; mixing 30g of potassium hexatitanate whisker with 300ml of ethanol, and ultrasonically dispersing for 30min under the ultrasonic power of 300W to obtain a suspension; dropwise adding the solution C into the suspension at a stirring speed of 500r/min, wherein the dropwise adding speed is 10ml/min, reacting at 60 ℃ for 2 hours after the dropwise adding is finished, filtering the reaction solution, and drying filter residues at 80 ℃ for 5 hours to obtain modified potassium hexatitanate whiskers;
step 3, weighing 100g of modified humic acid, 30g of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 15g of maleic anhydride acylated chitosan, 8g of modified potassium hexatitanate whisker, 2g of nonylphenol polyoxyethylene ether and 500g of water in parts by weight;
and 4, mixing the modified humic acid, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, maleic anhydride acylated chitosan, modified potassium hexatitanate whisker, nonylphenol polyoxyethylene ether and water weighed in the step 3, dispersing at a high speed of 1500r/min for 15min, and obtaining the petroleum drilling aid after the dispersion is finished.
for illustrating the effect, the invention also provides a comparative example which is as follows:
comparative example 1
the formula and the preparation method of the petroleum drilling auxiliary agent are the same as those of example 1, except that humic acid added in comparative example 1 is not modified.
Comparative example 2
the formulation and preparation method of the petroleum drilling aid are the same as those of example 1, except that 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid is not added in comparative example 2.
Comparative example 3
The formulation and preparation method of the petroleum drilling aid are the same as those of example 1, except that no maleic anhydride acylated chitosan is added in comparative example 3.
Comparative example 4
The formulation and preparation method of the petroleum drilling aid are the same as those of example 1, except that no modified potassium hexatitanate whisker is added in comparative example 4.
Comparative example 5
The petroleum drilling assistant consists of fulvic acid only.
in order to verify the effect of the invention, the petroleum drilling auxiliary agents prepared in examples 1-3 and comparative examples 1-5 are subjected to performance evaluation, specifically, the auxiliary agents prepared in the invention are added into different base slurries, then aging test is carried out on the auxiliary agents (namely, the process of carrying out corresponding condition strengthening experiment on the condition that various factors involved in actual use conditions of the product age the product is simulated), the change of the filtration loss amount of the product before and after aging is measured, and the quality of the performance of the filtration loss reducer is evaluated through the analysis of the measured data.
First, influence on wall building property of fresh water base slurry due to water loss
adding 16g of bentonite into 400mL of distilled water, stirring for 30min at a stirring speed of 2000r/min, and then maintaining for 24h in a closed manner at room temperature after stirring is finished to obtain the fresh water base slurry.
taking 10 parts of fresh water base pulp, taking one part as a blank sample, adding no auxiliary agent, adding only one auxiliary agent prepared in examples 1-3 and comparative examples 1-5 to the other 9 parts, wherein the addition amount is 1 percent of the weight of the fresh water base pulp, stirring for 30min at a stirring speed of 2000r/min after the addition is finished, measuring the filtration loss of the fresh water base pulp after aging for 16h at 260 ℃, and measuring the filtration loss of the sample by using a normal-temperature medium-pressure filtration loss instrument and a high-temperature high-pressure filtration loss instrument, wherein the specific results are shown in table 1.
TABLE 1 fluid loss reduction effect on fresh water based slurries
As can be seen from Table 1, for the fresh water-based slurry, when the addition amount of the auxiliary agent is 1% in example 1, after aging at 260 ℃/16h, the medium pressure water loss of the system is about 6ml, the high pressure water loss is about 24ml, and the fresh water-based slurry has good filtrate loss reduction; the fulvic acid in the formula of comparative example 1 is not modified, so that compared with examples 1-3, the water loss under pressure and the water loss under high pressure in the system are both large, which indicates that the modified fulvic acid has better high-heat resistance; the formula of the comparative example 2 is not added with 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, the water loss under pressure and the water loss under pressure in the system are both larger, but are smaller than those in the comparative example 1, which shows that for high-heat conditions, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid plays an important role in reducing filtration loss in the whole system, but the importance is not as high as that of modified fulvic acid; the formula of the comparative example 3 is not added with the maleic anhydride acylation chitosan, and the water loss under pressure and the water loss under high pressure in the system are equivalent to those in the examples 1 to 3, which shows that the maleic anhydride acylation chitosan has little influence on the filtration reduction effect of the system under high heat conditions; the formula of the comparative example 4 is not added with the modified potassium hexatitanate whisker, the water loss under pressure and the water loss under high pressure in the system are both large and are not greatly different from those of the comparative example 1, which shows that the modified potassium hexatitanate whisker plays an important role in reducing the filtration loss in the whole system for high-heat conditions; comparative example 5 only used xanthohumic acid as a filtrate reducer, and thus the effect was not satisfactory. In conclusion, under the condition of high heat, modified humic acid and modified potassium hexatitanate crystals play important roles in reducing the fluid loss, and the materials have mutual synergistic action and play a good role in reducing the fluid loss together.
Second, the influence on the water loss wall-building property of the saturated saline water base slurry
The fresh water base pulp with the same concentration is prepared according to the method, then sodium chloride is continuously added into 400ml of the fresh water base pulp until the fresh water base pulp is saturated to prepare saturated brine base pulp, the test conditions, the test method and the test items are partially the same as the influence on the water loss wall building property of the fresh water base pulp, and the specific results are shown in table 2.
TABLE 2 fluid loss reduction effect on saturated brine-based slurries
| Item | FLAPI(ml) | FLHIHP(ml) |
| Example 1 | 8.7 | 26.3 |
| Example 2 | 9.1 | 27.2 |
| Example 3 | 9.3 | 27.8 |
| Comparative example 1 | 13.8 | 30.1 |
| comparative example 2 | 21.6 | 36.4 |
| Comparative example 3 | 10.2 | 28.7 |
| Comparative example 4 | 12.6 | 31.2 |
| comparative example 5 | 41.3 | 63.8 |
| Blank control | Full leak | Full leak |
as can be seen from Table 2, for the saturated saline water-based slurry, when the addition amount of the auxiliary agent is 1% in example 1, after aging at 260 ℃/16h, the medium-pressure water loss of the system is about 9ml, the high-pressure water loss is about 27ml, and the saturated saline water-based slurry has good filtrate loss; the water loss under high pressure and the water loss under high pressure in the system of the comparative example 1 are not large, which shows that the filtration reduction effect of the modified fulvic acid is not obvious under the condition of high salt; comparative example 2 the water loss under high pressure and the water loss under high pressure are both larger, which shows that for the condition of high salt, 4-hydroxy-6-acetamido-2-naphthalene sulfonic acid plays an important role in reducing the filtration loss in the whole system; the water loss under pressure and the water loss under high pressure in the systems of the comparative example 3 and the comparative example 4 are equivalent to those in the examples 1 to 3, which shows that the maleic anhydride acylated chitosan and the modified potassium hexatitanate whisker have little influence on the fluid loss reduction of the systems under the high salt condition; comparative example 5 only used xanthohumic acid as a filtrate reducer, and thus the effect was not satisfactory. In conclusion, under the condition of high salt, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid plays an important role in reducing the fluid loss, and materials have mutual synergistic action and play a good role in reducing the fluid loss together.
Influence on water loss wall building performance of composite saline water base slurry
The fresh water base pulp with the same concentration is prepared according to the method, then 18g of sodium chloride, 5.2g of magnesium chloride and 2g of calcium chloride are added into 400ml of the fresh water base pulp to prepare the composite brine base pulp, the test conditions, the test method and the test items are the same as the influence on the wall building property of the fresh water base pulp due to water loss, and the specific results are shown in table 3.
TABLE 3 fluid loss reduction effect on composite brine-based slurries
| Item | FLAPI(ml) | FLHIHP(ml) |
| Example 1 | 8.3 | 25.8 |
| Example 2 | 8.6 | 26.1 |
| example 3 | 8.1 | 25.6 |
| Comparative example 1 | 12.6 | 28.7 |
| comparative example 2 | 18.7 | 35.2 |
| Comparative example 3 | 9.2 | 26.9 |
| Comparative example 4 | 9.8 | 27.6 |
| Comparative example 5 | 37.4 | 59.8 |
| blank control | Full leak | full leak |
As can be seen from Table 3, for the composite saline base slurry, when the addition amount of the auxiliary agent in example 1 is 1%, after aging at 260 ℃/16h, the medium-pressure water loss amount of the system is about 8ml, the high-pressure water loss amount is about 26ml, and the composite saline base slurry is equivalent to the saturated saline base slurry and has better filtrate loss reduction; the trends of comparative examples 1 to 5 are comparable to those of saturated saline-based slurries, i.e., the action of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid is more important in terms of calcium and magnesium resistance, and the materials have synergistic interaction and together play a good fluid loss reducing role.
While the present invention has been described with respect to preferred embodiments, additional variations and modifications will occur to those embodiments once the basic inventive concepts are known to those skilled in the art. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The petroleum drilling auxiliary is characterized by comprising the following components in parts by mass: 80-100 parts of modified humic acid, 20-30 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10-15 parts of maleic anhydride acylated chitosan, 5-10 parts of modified potassium hexatitanate whisker, 1-2 parts of surfactant and 500 parts of water 400-;
The modified humic acid is obtained by modifying humic acid with polyacrylic acid and a silane coupling agent, and is prepared by the following steps:
Dissolving polyacrylic acid in ethanol to obtain a solution A; adding a silane coupling agent A into the solution A, and uniformly mixing to obtain a solution B; adding humic acid into the solution B, uniformly dispersing by ultrasonic, heating to 60-80 ℃, reacting for 4-5h under the condition of stirring, filtering after the reaction is finished, and drying to obtain the modified humic acid;
Wherein the mass ratio of the polyacrylic acid to the silane coupling agent A to the humic acid to the ethanol is 1-2: 2: 20: 100, respectively;
The modified potassium hexatitanate crystal whisker is obtained by modifying potassium hexatitanate crystal with silane coupling agent, and is prepared by the following steps:
mixing and dissolving a silane coupling agent B and ethanol according to the mass ratio of 1:20 to obtain a solution C; mixing potassium hexatitanate whiskers with ethanol according to a mass ratio of 1:10, and performing ultrasonic dispersion to obtain a suspension; dropwise adding the solution C into the suspension under the stirring condition, reacting at 60 ℃ for 1-2h after dropwise adding is finished, and then filtering and drying the reaction liquid to obtain the modified potassium hexatitanate whisker;
Wherein the mass ratio of the silane coupling agent B to the potassium hexatitanate whisker is 1: 20-30 parts of;
the silane coupling agent A and the silane coupling agent B are both silane coupling agents KH 550.
2. The oil drilling aid according to claim 1, which is composed of the following components in parts by mass: 90 parts of modified humic acid, 25 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10 parts of maleic anhydride acylated chitosan, 10 parts of modified potassium hexatitanate whisker, 1 part of surfactant and 450 parts of water.
3. An oil drilling aid according to claim 1 or 2 wherein the humic acid is fulvic acid.
4. The oil drilling aid of claim 1 or 2, wherein the modified potassium hexatitanate whiskers have a diameter of 0.2-1.0 microns and a length of 8-12 microns.
5. The oil drilling aid of claim 1 or 2, wherein the surfactant is nonylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether.
6. the method of preparing an oil drilling aid according to claim 1, comprising the steps of:
Step 1, preparation of modified humic acid
dissolving polyacrylic acid in ethanol to obtain a solution A; adding a silane coupling agent A into the solution A, and uniformly mixing to obtain a solution B; adding humic acid into the solution B, uniformly dispersing by ultrasonic, heating to 60-80 ℃, reacting for 4-5h under the condition of stirring, filtering after the reaction is finished, and drying to obtain the modified humic acid;
Wherein the mass ratio of the polyacrylic acid to the silane coupling agent A to the humic acid to the ethanol is 1-2: 2: 20: 100, respectively;
Step 2, preparing modified potassium hexatitanate whisker
mixing and dissolving a silane coupling agent B and ethanol according to the mass ratio of 1:20 to obtain a solution C; mixing potassium hexatitanate whiskers with ethanol according to a mass ratio of 1:10, and performing ultrasonic dispersion to obtain a suspension; dropwise adding the solution C into the suspension under the stirring condition, reacting at 60 ℃ for 1-2h after dropwise adding is finished, and then filtering and drying the reaction liquid to obtain the modified potassium hexatitanate whisker;
Wherein the mass ratio of the silane coupling agent B to the potassium hexatitanate whisker is 1: 20-30 parts of;
Step 3, weighing 80-100 parts of modified humic acid, 20-30 parts of 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, 10-15 parts of maleic anhydride acylated chitosan, 5-10 parts of modified potassium hexatitanate whisker, 1-2 parts of surfactant and 500 parts of water 400-;
And 4, mixing the modified humic acid, 4-hydroxy-6-acetamido-2-naphthalenesulfonic acid, maleic anhydride acylated chitosan, modified potassium hexatitanate whisker, a surfactant and water weighed in the step 3, dispersing at a high speed, and obtaining the petroleum drilling aid after the dispersion is finished.
7. the method for preparing an oil drilling aid according to claim 6, wherein the ultrasonic dispersion conditions in step 1 and step 2 are both: dispersing for 30min under the condition of ultrasonic power of 300W; the stirring conditions in the step 1 and the step 2 are both 500 r/min.
8. the method for preparing an oil drilling aid as claimed in claim 6, wherein the high speed dispersion rotation speed in step 4 is 1000-1500r/min, and the dispersion time is 15-30 min.
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