CN115678513A - Functional composite fluid loss additive for one-trip drilling process - Google Patents
Functional composite fluid loss additive for one-trip drilling process Download PDFInfo
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Abstract
The invention discloses a functional composite fluid loss agent for a one-trip drilling process, which comprises the following components in percentage by mass: 30-50% of a multi-polymer, 40-60% of an oil dispersion medium, 3-5% of a thickening agent, 5-7% of a suspension dispersant and 1-2% of an antifreezing agent; the multi-polymer is one of hydrolyzed polyacrylonitrile salt polymer, propylene polymer, hydrophobic association polymer and sulfonate copolymer; the thickening agent is one of magnesium aluminum silicate, sodium lignosulfonate, carboxymethyl cellulose, carbomer, calcium-based ester, polyurea thickening agent and polyisoprene; the antifreezing agent is one of dichloromethane, thiourea, white granulated sugar, honey, dimethyl sulfoxide, ethanol and ethylene glycol. The filtrate reducer can be used for different drilling fluid systems, can be prepared by clear water or saline water, can be rapidly dispersed and swelled in water, and the prepared drilling fluid has good comprehensive properties of temperature resistance, salt resistance, filtration loss reduction, lubrication coefficient reduction and the like.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a functional composite emulsion fluid loss additive for a one-trip drilling process.
Background
China has unconventional oil and gas resources with huge reserves, development test areas of the oil and gas resources are established in various oil and gas fields in recent years, high and new technologies of large-scale design of well factories and one-trip drilling operation of directional drilling are continuously researched and widely applied, and economic and efficient development of the unconventional oil and gas resources is greatly promoted. The method realizes that the whole footage of the well with the same size is continuously drilled by one-time well descending, is an ideal safe and efficient rock breaking and guiding drilling technology, scientifically modulates an advanced and applicable water-based drilling fluid system, is the key for ensuring safe and environment-friendly operation of one-time drilling, and has higher and higher requirements on the temperature resistance, salt resistance, density, rheological property and other properties of the drilling fluid along with the increase of high-temperature deep wells.
In recent years, how to prepare a fluid loss additive which meets the requirements of oil and gas fields on safety and environmental protection and has good performance becomes a problem to be solved urgently, and a drilling fluid system which mainly comprises the fluid loss additive of an acrylamide polymer becomes a hot spot of research on a high-performance water-based drilling system and a drilling process in one trip. At present, the research on the polymer fluid loss additive at home and abroad has also achieved some achievements, and the results mainly comprise powder polymers obtained by aqueous solution polymerization and emulsion polymers obtained by water-in-oil polymerization. For example, the techniques disclosed in patents CN101864030, CN114316282, and CN 104263329.
However, the polymer filtrate reducer generally has the problems that the powdery filtrate reducer is inconvenient to use on site, the dissolving time is long, and the lubricating effect is poor; the filtrate reducer product obtained by emulsion polymerization contains a large amount of emulsifying agents, the compatibility of the product is reduced, the solid phase content is relatively low, and the stability and the temperature resistance are poor. Therefore, the existing polymer fluid loss additive has advantages in effective substance content and comprehensive performance, and has a plurality of defects to be further improved and optimized.
Disclosure of Invention
The invention aims to provide a functional composite fluid loss agent for a one-trip drilling process, aiming at the defects of the existing polymer fluid loss agent.
The invention provides a functional composite fluid loss additive for a one-trip drilling process, which comprises the following components in percentage by mass:
30-50% of multi-polymer, 40-60% of oil dispersion medium, 3-5% of thickening agent, 5-7% of suspension dispersant and 1-2% of antifreezing agent. Wherein the content of the first and second substances,
the multi-component polymer is one of hydrolyzed polyacrylonitrile salt polymer, propylene polymer, hydrophobic association polymer and sulfonate copolymer.
The thickening agent is one of magnesium aluminum silicate, sodium lignosulfonate, carboxymethyl cellulose, carbomer, calcium-based ester, polyurea thickening agent and polyisoprene.
The antifreezing agent is one of dichloromethane, thiourea, white granulated sugar, honey, dimethyl sulfoxide, ethanol and ethylene glycol.
The oil dispersion medium is one or a mixture of two of white oil, diesel oil, naphthenic oil, aviation kerosene, squalane, transformer oil and biodegradable hydraulic oil. The preferable dispersion medium is biodegradable hydraulic oil, the main components of the biodegradable hydraulic oil comprise vegetable base oil and synthetic vinegar, and the vegetable oil has natural biodegradability and viscosity-temperature performance.
The suspension dispersant is one or two of Tween 60, tween 80, span 60, CAB-35, AEO, OP-10 and dodecyl phosphate betaine.
Preferably, the functional composite fluid loss agent for the one-trip drilling process comprises the following components in percentage by mass: 40% of a multi-polymer, 48% of an oil dispersion medium, 4% of a thickening agent, 6% of a suspension dispersant and 2% of an antifreezing agent.
The invention also provides a preparation method of the functional composite fluid loss agent for the one-trip drilling process, which comprises the following steps:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding an oil dispersion medium into the reaction kettle, starting stirring, controlling the stirring speed to be the best when the linear velocity at the tail end of a stirring rod is more than 18m/S, slowly adding a thickening agent in a stirring state, adding a suspension dispersing agent and an antifreezing agent after stirring uniformly, and continuing stirring for 10min to form a light yellow viscous liquid, namely a suspension base liquid.
And S2, pumping suspension base liquid into a colloid mill communicated with the reaction kettle from a reaction kettle with a diaphragm pump under the stirring condition, adding the multipolymer at the upper end of the colloid mill, controlling the adding speed of the multipolymer at 25kg/10min, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form the stable and uniform functional composite filtrate reducer.
Compared with the prior art, the invention has the advantages that:
(1) The invention adopts the multipolymer to prepare a suspension system through a suspension compounding process, is green and environment-friendly, integrates the functions of reducing filtration loss, resisting temperature and salt, reducing lubricating coefficient and the like, and solves a series of problems of low dissolving speed, easy dust generation, poor lubricating effect, low content of effective substances of the emulsion fluid loss additive, low swelling speed, poor stability, easy solidification and agglomeration at low temperature and the like of the conventional powder fluid loss additive. The reduction rate of the lubricating coefficient is up to more than 60 percent, the performance of the drilling fluid can be effectively improved, and the drilling fluid is suitable for different drilling fluid systems, and is particularly suitable for preparing high-performance water-based drilling fluid for a one-trip drilling process.
(2) The drilling fluid can be used for different drilling fluid systems, can be prepared by clear water or saline water, can be rapidly dispersed and swelled in water, has good comprehensive performances of temperature resistance, salt resistance, filtration loss reduction, lubrication coefficient reduction and the like, can still keep a flowing state at the temperature of-15 ℃, can control the performance of the drilling fluid by adjusting the dosage during field construction, and is very suitable for large-scale one-trip drilling construction of well factories and unconventional oil and gas reservoirs.
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.
Drawings
Fig. 1 and a graph showing the results of the compatibility tests of the functional composite fluid loss additive of examples 1 to 6.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1: the preparation method of the functional composite fluid loss agent comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 50kg of biodegradable hydraulic oil into the reaction kettle, starting stirring, controlling the stirring speed to optimally adjust the linear velocity of the tail end of a stirring rod to be more than 18m/S, slowly and uniformly adding 4kg of thickening agent magnesium aluminum silicate under the stirring state, continuously stirring for 20min, adding 6kg of suspension dispersant (mixture of span 80 and Tween 60 in equal mass ratio) and 2kg of antifreezing agent dichloromethane, and continuously stirring for 10min to form light yellow viscous liquid, namely suspension base liquid.
S2, pumping suspension base liquid into a colloid mill communicated with the reaction kettle from the reaction kettle by a diaphragm pump under the stirring condition, adding 38kg of partially hydrolyzed polyacrylamide into the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer; numbered PFR-1. In order to reduce the cost of the liquid and ensure the performance of the drilling fluid, the drilling fluid is prepared by adopting clear water.
Example 2: the preparation method of the functional composite fluid loss agent comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 48kg of naphthenic base oil into the reaction kettle, starting stirring, controlling the stirring speed to optimally adjust the linear velocity of the tail end of a stirring rod to be more than 18m/S, slowly and uniformly adding 4kg of thickening agent sodium lignosulphonate with low sulfonation degree in a stirring state, continuously stirring for 20min, adding 6kg of suspension dispersant (mixture of span 80 and Tween 60 in equal mass ratio) and 2kg of antifreezing agent thiourea, and continuously stirring for 10min to form light yellow viscous liquid, namely suspension base liquid.
S2, pumping suspension base liquid into a colloid mill communicated with the reaction kettle from a reaction kettle with a diaphragm pump under the stirring condition, adding 40kg of propylene-based polymer (acrylonitrile-butadiene-acrylate copolymer) at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer; numbered PFR-2. The PFR-2 has excellent salt resistance and temperature resistance, and can be prepared into drilling fluid by adopting clear water or composite salt water.
Example 3: the preparation method of the functional composite filtrate reducer comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 48kg of squalane into the reaction kettle, starting stirring, controlling the stirring speed to be the best when the linear velocity at the tail end of a stirring rod is greater than 18m/S, slowly and uniformly adding 4kg of thickening agent calcium-based grease in a stirring state, continuously stirring for 20min, adding 6kg of suspension dispersant (mixture of dodecyl phosphate betaine, tween 60 and the like in a mass ratio) and 2kg of antifreezing agent white granulated sugar, and continuously stirring for 10min to form light yellow viscous liquid, namely suspension base liquid.
S2, pumping a suspension base liquid into a colloid mill communicated with the reaction kettle from a diaphragm pump of the reaction kettle under the stirring condition, adding 40kg of sulfonate polymer (acrylamide-dimethyl diallyl ammonium chloride-2-acrylamide-2-methyl sodium propane sulfonate copolymer) at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer, wherein the serial number is PFR-3. The PFR-3 has excellent salt resistance and temperature resistance, and can be prepared into drilling fluid by adopting clear water or saturated salt water.
Example 4: the preparation method of the functional composite fluid loss agent comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 45kg of dispersion medium (a mixture of biodegradable hydraulic oil and aviation kerosene with the mass ratio of 1.
S2, pumping suspension base liquid into a colloid mill communicated with the reaction kettle from the reaction kettle by a diaphragm pump under the stirring condition, adding 44kg of partially hydrolyzed polyacrylamide at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer which is numbered as PFR-4.
Example 5: the preparation method of the functional composite filtrate reducer comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 40kg of dispersion medium (the mass ratio of biodegradable hydraulic oil to white oil is 1.
S2, pumping suspension base liquid into a colloid mill communicated with the reaction kettle from the reaction kettle by a diaphragm pump under the stirring condition, adding 50kg of propenyl polymer (acrylonitrile-butadiene-acrylate copolymer) at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer, wherein the serial number of the filtrate reducer is PFR-5.
Example 6: the preparation method of the functional composite fluid loss agent comprises the following steps of taking 100kg of product as an example:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding 60kg of dispersion medium (the mass ratio of biodegradable hydraulic oil to squalane is 1.
S2, pumping a suspension base solution into a colloid mill communicated with the reaction kettle by a diaphragm pump arranged in the reaction kettle under the stirring condition, adding 30kg of sulfonate polymer (acrylamide-dimethyldiallylammonium chloride-2-acrylamide-2-methyl sodium propanesulfonate copolymer) at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form a stable and uniform functional composite filtrate reducer, wherein the serial number of the filtrate reducer is PFR-6.
Performance evaluation:
in the measurement experiment of the functional composite filtrate reducer prepared by the embodiment of the invention, the high-speed stirring speed is 11000r/min to 12000r/min.
(1) Evaluation of long-term stability of the functional composite fluid loss additive of examples 1 to 6:
and (3) respectively pouring the prepared functional composite fluid loss additive PFR-1, PFR-2, PFR-3, PFR-4, PFR-5 and PFR-6400mL in 200mL into a transparent sample bottle with scales, standing in a room at normal temperature, regularly (every month) observing samples in the bottle, and recording the precipitation condition at the bottom and the volume of supernatant liquid. In addition, 200mL of the solution is poured into a transparent sample bottle with scales, the sample bottle is placed in a refrigerator freezing chamber with the temperature of-15 ℃, samples in the bottle are observed regularly (every 10 days), the bottom precipitation condition and the volume of supernatant liquid are recorded, and data and experimental phenomena are shown in a table 1. The test result shows that the time for all samples to have no delamination at room temperature and-15 ℃ is more than 6 months, and the PFR-2 and the PFR-3 have almost no change in the observation period of 9 months, thereby showing excellent long-term stability.
Table 1 results of testing long-term stability of functional composite type fluid loss additives of examples 1 to 6
(2) And (3) testing the performance of the drilling fluid prepared from the functional composite filtrate reducer in the embodiments 1 to 6.
Preparing base slurry: 400mL of distilled water and 0.64g (weighed to be 0.01 g) of anhydrous sodium carbonate are distributed and added into a high-stirring cup, 16.0g (weighed to be 0.01 g) of bentonite for the drilling fluid test slurry is slowly added under high-speed stirring after dissolution to avoid agglomeration, the high-speed stirring is accumulated for 20min, at least two times are stopped during the process, the bentonite adhered to the cup wall is scraped, and the closed maintenance is carried out for 24h at the temperature of 25 +/-1 ℃.
Preparing the fresh water slurry drilling fluid and testing the performance: taking two cups of prepared base slurry, slowly adding 3.5g (weighed to be 0.01 g) of the sample under high-speed stirring, cumulatively stirring at high speed for 20min, and stopping at least twice during the period so as to scrape the drilling fluid sample adhered to the cup wall. And (3) sealing and maintaining the mixture for 24 hours at the temperature of 25 +/-1 ℃ in a biochemical incubator, stirring the mixture at a high speed for 5 minutes, and measuring the apparent viscosity and the API (American Petroleum institute) filtration loss of the drilling fluid at room temperature.
Taking another two cups of prepared fresh water base slurry, slowly adding 6g of the sample (weighed to 0.01 g) under high-speed stirring, accumulating the high-speed stirring for 20min, stopping at least twice during the period to scrape the drilling fluid sample adhered to the cup wall, transferring the drilling fluid sample into a maintenance tank, introducing nitrogen gas of 0.7Mpa for 30s, putting the maintenance tank into a roller heating furnace, and hot rolling for 16h at 150 ℃. Taking out the maintenance tank, cooling to room temperature, transferring the test slurry in the maintenance tank into a stirring cup, stirring at high speed for 5min, and measuring HTHP filtration loss under the conditions of 150 ℃ and 3.45 Mpa.
Preparing the composite brine slurry drilling fluid and testing the performance: taking 4 cups of prepared base slurry of 400mL each, slowly adding 15.0g of the sample (weighed to 0.01 g) under high-speed stirring, and cumulatively stirring at high speed for 20min, wherein the sample is stopped at least twice during the stirring so as to scrape off the drilling fluid sample adhered to the cup wall. Then 18.0g of sodium chloride, 5.2g of magnesium chloride hexahydrate and 2.0g of anhydrous calcium chloride are added, and the mixture is stirred at a high speed for 20min. Taking two cups of sample slurry, maintaining in a biochemical incubator at 25 +/-1 ℃ for 24h in a closed manner, stirring at a high speed for 5min, and measuring the apparent viscosity and API (application program interface) filtrate loss of the drilling fluid at room temperature.
Taking another two cups of sample pulp, transferring into a maintenance tank, introducing nitrogen gas at 0.7Mpa for 30s, placing the maintenance tank into a roller heating furnace, and hot rolling at 150 ℃ for 16h. Taking out the maintenance tank, cooling to room temperature, transferring the test slurry in the maintenance tank into a stirring cup, stirring at high speed for 5min, measuring apparent viscosity, and measuring HTHP filtration loss under the conditions of 150 ℃ and 3.45 Mpa.
Preparing saturated saline slurry drilling fluid and testing performance: taking 4 cups of prepared base slurry of 400mL each, slowly adding 15.0g of the sample under high-speed stirring, accumulating the high-speed stirring for 20min, and stopping at least twice during the period so as to scrape off the drilling fluid sample adhered to the cup wall. Then 136.0g of sodium chloride is added, and the mixture is stirred at a high speed for 20min.
Taking two cups of sample slurry, maintaining in a biochemical incubator at 25 +/-1 ℃ for 24h in a closed manner, stirring at a high speed for 5min, and measuring the apparent viscosity and the API (American Petroleum institute) filtrate loss of the drilling fluid at room temperature.
Taking another two cups of sample pulp, transferring into a maintenance tank, introducing nitrogen gas at 0.7Mpa for 30s, placing the maintenance tank into a roller heating furnace, and hot rolling at 150 ℃ for 16h. Taking out the maintenance tank, cooling to room temperature, transferring the test slurry in the maintenance tank into a stirring cup, stirring at high speed for 5min, measuring apparent viscosity, and measuring HTHP filtration loss under the conditions of 150 ℃ and 3.45 Mpa.
The performance test results of the drilling fluid prepared from the functional composite type fluid loss additive in the embodiments 1-6 are shown in table 2, and the experimental data in the table show that the functional composite type fluid loss additive prepared by the invention meets the requirements of different drilling fluid systems, and has good temperature resistance and salt resistance effects.
Table 2 results of testing the properties of drilling fluids formulated in examples 1-6
(3) And testing the compatibility of the functional composite filtrate reducer of the embodiments 1-6.
The compatibility of the functional composite filtrate reducer of the embodiment 1-6 is tested by using the field well slurry, and the density of the well slurry is 1.8g/cm 3 Aging temperature 180 ℃, HTHP at 180 ℃ was tested, and the experimental results are shown in FIG. 1. With the addition of the functional composite fluid loss additive, the fluid loss of the well slurry is obviously improved and reduced to 18mL from the lowest uncontrolled value, and the fluid loss is reduced with the increase of the dosage, so that the effect of the fluid loss additive is better. The fluid loss agent provided by the invention has good compatibility with other additives in well slurry, has excellent fluid loss performance, and can be used on site to optimize the dosage according to experiments.
(4) The lubricating coefficient reduction rate of the functional composite fluid loss additive of examples 1 to 6 was measured.
Taking 400mL of distilled water, adding 20.0g (accurate to 0.01 g) of bentonite for drilling fluid test slurry preparation and 0.8g (accurate to 0.01 g) of anhydrous sodium carbonate, stirring at a high speed for 20min, pouring into a closed container, maintaining at (25 +/-3) DEG C for 24h, adding 16.0g of sodium chloride, stirring at a high speed for 10min, and taking the mixture as base slurry for later use. 6g of a sample was added to the base slurry, and stirred at a high speed for 20min. And respectively measuring the lubrication coefficients of the base slurry and the sample-adding slurry by using an extreme pressure lubrication instrument at room temperature.
The lubrication coefficient decrease rate was calculated as follows.
In the formula:
r-reduction of coefficient of lubrication,%;
K 0 -the lubricity coefficient of the base slurry;
K 1 -the lubrication factor of the sample slurry.
Two common filtrate reducer comparison products 1 and 2 in the market are selected, wherein the comparison product 1 is a drilling emulsion filtrate reducer of Shandong Baomo biochemical industry Co., ltd, and the comparison product 2 is a filtrate reducer AMPS emulsion copolymer QFL-1 for drilling fluid of a seventh chemical industry Co., ltd, new county, henan province, and the experimental data are shown in Table 3. Experimental results show that the fluid loss additive provided by the invention has the lubrication coefficient reduction rate of more than 60% and the comparative products have lower lubrication coefficient reduction rates. Because the main component dispersant in the fluid loss additive provided by the invention is oil substances, the solid-solid friction between the drilling tool and the well wall is converted into the friction between oil films or between non-polar ends by forming an adsorption oil film on the surfaces of the drilling tool, the well wall and the drill cuttings, the friction between the drilling tool and the well wall is reduced, and the wear of the drilling tool is reduced. Therefore, the fluid loss additive provided by the invention can effectively reduce the flow resistance of drilling fluid and the friction coefficient of filter cakes, reduce the torque of a drill bit and improve the water horsepower of the drill bit. The product can reduce the usage amount of the lubricant in the drilling fluid system and reduce the drilling cost.
Table 3 results of the test of the coefficient of lubricity decrease rate of the functional composite type fluid loss additive of examples 1 to 6
| Sample numbering | Base stock lubrication coefficient | Coefficient of sample slurry lubrication | A lubrication coefficient reduction rate% |
| PFR-1 | 53.6 | 17.8 | 66.79 |
| PFR-2 | 53.6 | 18.6 | 65.30 |
| PFR-3 | 53.6 | 18.9 | 64.74 |
| PFR-4 | 53.6 | 17.2 | 67.91 |
| PFR-5 | 53.6 | 18.7 | 65.11 |
| PFR-6 | 53.6 | 18.2 | 66.04 |
| |
53.6 | 33.2 | 38.06 |
| |
53.6 | 42.8 | 20.15 |
(5) And the EC50 test of the biological toxicity of the functional composite type fluid loss additive of the embodiment 1-6.
The biotoxicity EC50 of the functional composite type filtrate reducers of examples 1 to 6 was tested according to the bacterial luminescence method, and the experimental results are shown in table 4. Experimental results show that the fluid loss additive provided by the invention has EC50 of more than 30000mg/L, and is environment-friendly and safe.
Table 4 biotoxicity EC50 test results of functional complex fluid loss additives of examples 1 to 6
| Sample numbering | EC50，mg/L |
| PFR-1 | 31028 |
| PFR-2 | 30085 |
| PFR-3 | 30062 |
| PFR-4 | 32014 |
| PFR-5 | 31032 |
| PFR-6 | 30862 |
In conclusion, the functional composite filtrate reducer provided by the invention has the advantages of high dissolving speed, lubricating coefficient reducing function, environmental friendliness, and capability of being used for different drilling fluid systems and effectively reducing the filtrate loss of mud; the reduction rate of the lubricating coefficient is up to more than 60 percent, the performance of the drilling fluid can be effectively improved, and the method is applicable to different drilling fluid systems, and is particularly suitable for preparing the high-performance water-based drilling fluid for the drilling process of one-trip drilling. Meanwhile, compared with the filtrate reducer in the prior art, the filtrate reducer is more convenient to use, reduces energy consumption and avoids resource waste.
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 (6)
1. The functional composite fluid loss agent for the one-trip drilling process is characterized by comprising the following components in percentage by mass:
30-50% of a multi-polymer, 40-60% of an oil dispersion medium, 3-5% of a thickening agent, 5-7% of a suspension dispersant and 1-2% of an antifreezing agent;
the multi-polymer is one of hydrolyzed polyacrylonitrile salt polymer, propylene polymer, hydrophobic association polymer and sulfonate copolymer;
the thickening agent is one of magnesium aluminum silicate, sodium lignosulfonate, carboxymethyl cellulose, carbomer, calcium-based ester, polyurea thickening agent and polyisoprene;
the antifreezing agent is one of dichloromethane, thiourea, white granulated sugar, honey, dimethyl sulfoxide, ethanol and ethylene glycol.
2. The functional composite fluid loss additive for one-trip drilling process according to claim 1, wherein the oil dispersion medium is one or a mixture of two of white oil, diesel oil, naphthenic oil, aviation kerosene, squalane, transformer oil and biodegradable hydraulic oil.
3. The functional composite fluid loss additive for one-trip drilling process according to claim 2, wherein the suspending dispersant is one or two of tween 60, tween 80, span 60, CAB-35, AEO, OP-10 and dodecyl phosphate betaine.
4. The functional composite fluid loss additive for one-trip drilling process according to claim 3, which comprises the following components in percentage by mass: 40% of a multi-polymer, 48% of an oil dispersion medium, 4% of a thickening agent, 6% of a suspension dispersant and 2% of an antifreezing agent.
5. The method for preparing the functional composite type fluid loss additive for the one-trip drilling process according to any one of claims 1 to 4, which is characterized by comprising the following steps of:
s1, setting the temperature of a reaction kettle to be constant at 30 +/-2 ℃, adding an oil dispersion medium into the reaction kettle, starting stirring, slowly adding a thickening agent in a stirring state, adding a suspension dispersing agent and an antifreezing agent after uniformly stirring, and continuously stirring for 10min to form a light yellow viscous liquid, namely a suspension base liquid;
and S2, pumping the suspension base liquid into a colloid mill communicated with the reaction kettle from the reaction kettle by a diaphragm pump under the stirring condition, adding the multipolymer at the upper end of the colloid mill, enabling the liquid and the raw materials to return to the reaction kettle after mixing, grinding and shearing circulation through the colloid mill, and circularly stirring for 120min to form the stable and uniform functional composite filtrate reducer.
6. The method for preparing the functional composite type fluid loss additive for one-trip drilling process according to claim 5, wherein in the step S2, the adding speed of the copolymer is controlled at 25kg/10min.
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| CN113549442A (en) * | 2021-08-30 | 2021-10-26 | 四川奥赛德材料科技有限公司 | Functional composite thickening agent for integrated fracturing process |
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