CN114181680A - Thixotropic modifier for water-based drilling fluid and application thereof - Google Patents
Thixotropic modifier for water-based drilling fluid and application thereof 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
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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
- C09K8/02—Well-drilling compositions
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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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
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Abstract
The invention discloses a thixotropic modifying agent for water-based drilling fluid and application thereof, relating to the technical field of drilling fluid. When the N-methyl pyrrolidone solution of the modified polyurea is added into the drilling fluid, the insolubility of the effective substance in water is utilized to form fine needle-shaped micro-crystals, the three-dimensional network structure can be quickly formed by the combined action of the crystals and hydrogen bonds and the like, excellent anti-settling property is provided for the drilling fluid, meanwhile, the low shearing rate is enough to destroy the network structure, the low viscosity required by the flowing of the drilling fluid is quickly achieved, and the characteristics of the obviously low-shear thickening agent are realized. The N-methylpyrrolidone solution of the modified polyurea can be better applied to various water-based drilling fluids at normal temperature, has good synergistic effect, can realize good thixotropic effect, has different degrees of improvement on dynamic-plastic ratio, water loss and lubricity, and can be used as a thixotropic improver for the water-based drilling fluids.
Description
Technical Field
The invention relates to the technical field of drilling fluid, and particularly relates to a thixotropic modifying agent for water-based drilling fluid and application thereof.
Background
The drilling engineering is the most direct technical means for acquiring the internal data of the earth and providing a test space and a resource exploitation channel, and drilling construction often faces difficult-to-predict complex conditions in a hole, so that great uncertainty is brought to the engineering. The drilling fluid is blood in drilling engineering and plays an important role in maintaining good construction conditions in holes. Drilling fluid technology is one of the key technologies to ensure rapid and safe drilling.
The good thixotropy of the drilling fluid is beneficial to suspending weighting agents and rock debris, and the importance of the drilling fluid is more prominent particularly under the static or low-speed condition of the drilling fluid, so that the drilling fluid is one of the important characteristics of the drilling fluid. The shear force of thixotropic drilling fluids is related to, in addition to shear rate, temperature, etc., shear duration, standing time, which is a time-dependent fluid. The bentonite-containing drilling fluid is a typical thixotropic fluid, partial high polymers and inorganic salts can change the thixotropy of the drilling fluid, but with the increase of the addition of the materials, the problems of solid content increase, drilling fluid system change and the like can be caused, and the thixotropic effect of most materials is not obvious.
At present, the research on the thixotropy of the drilling fluid mainly focuses on the aspects of evaluation methods, comparison of different formula properties, thixotropic equations and the like, and the drilling fluid treating agent is only classified without a thixotropic agent temporarily, so that the research and development of special materials are not much. Therefore, research on a thixotropy modifier for water-based drilling fluid, which can maintain the existing drilling fluid system, can regulate the thixotropy more accurately and achieve the effect of 'quick weak gel', is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a thixotropic improver for water-based drilling fluid and application thereof.
The purpose of the invention is realized by the following technical scheme: the modified polyurea is applied to the thixotropic modifying agent of the water-based drilling fluid.
Further, the modified polyurea is in the form of N-methyl pyrrolidone solution of the modified polyurea.
Further, the mass percentage concentration of the modified polyurea in the drilling fluid system is 1.5-2%.
A water-based drilling fluid thixotropy modifier comprises the modified polyurea.
As a preferred scheme, the water-based drilling fluid is a solid-free drilling fluid, and the use formula of the modifier is as follows: water, 0.2-0.5% of PAM and 1.5-2% of modified polyurea.
Preferably, the water-based drilling fluid is a finely dispersed drilling fluid, and the modifier is prepared from the following formula: water, 3-6% of sodium bentonite and 1.5-2% of modified polyurea.
As a preferred scheme, the water-based drilling fluid is a non-dispersed low solid phase drilling fluid, and the modifier comprises the following components in percentage by weight: water, 2-5% of sodium bentonite, 0.1-0.3% of CMC, 0.01-0.03% of PHP and 1.5-2% of modified polyurea.
The invention has the following advantages:
(1) the N-methyl pyrrolidone solution of the modified polyurea has the nonvolatile part accounting for 52 percent and can be well mixed and dissolved in water, and the thickening mechanism of the N-methyl pyrrolidone solution has the functions of hydrogen bonds and terminal groups. The N-methyl pyrrolidone solution of the modified polyurea has the function of steric hindrance, when the N-methyl pyrrolidone solution is added into drilling fluid, fine needle-shaped microcrystallines are formed by utilizing the insolubility of effective substances in water, the microcrystallines can quickly form a three-dimensional network structure under the combined action of hydrogen bonds and the like, excellent anti-settling property is provided for the drilling fluid, meanwhile, the low shear rate is enough to destroy the network structure, the low viscosity required by the flowing of the drilling fluid is quickly achieved, and the N-methyl pyrrolidone solution has the characteristic of obviously low shear-reducing thickening agent.
(2) The N-methylpyrrolidone solution of the modified polyurea has structural characteristics of different sizes, semi-transparent sheets and the like when being observed by naked eyes after being dissolved in water, and the water solution can be quickly lost when a water loss experiment is carried out, so that the actual particles of the modified polyurea in water belong to the category of solute or slightly small colloidal particles (1-100nm), and the modified polyurea does not precipitate after being placed for a long time. But is not easy to separate in the water loss test when being matched with the montmorillonite, and the montmorillonite can be strongly adsorbed by the montmorillonite, and the synergistic effect of the montmorillonite and the montmorillonite is good.
(3) Through the test of testing the thixotropy and related properties of the pure solution of the modified polyurea and the addition of the pure solution of the modified polyurea into various drilling fluids, the N-methylpyrrolidone solution of the modified polyurea can be better applied to various water-based drilling fluids at normal temperature, has good synergistic effect, can realize good thixotropy, has different degrees of improvement on the dynamic-plastic ratio, the water loss and the lubricity, and can be used as a thixotropy modifier for the water-based drilling fluids.
Drawings
FIG. 1 is a graph showing the relationship between static shear force and static time of an aqueous solution of the modified polyurea in different concentrations.
FIG. 2 is a shear force-rate gradient semilogarithmic thixotropic plot of aqueous solutions of various concentrations of the additive modified polyurea.
FIG. 3 is a viscosity-gradient semilogarithmic thixotropic plot of aqueous solutions of various concentrations of the additive modified polyurea.
FIG. 4 is a graph showing the relationship between static shear force and static time of the drilling fluid added with the modified polyurea.
FIG. 5 is a shear force-velocity gradient semilogarithmic thixotropic curve diagram of drilling fluid with the addition of modified polyurea.
FIG. 6 is a viscosity-speed gradient semilogarithmic thixotropic curve diagram of the drilling fluid with the addition of modified polyurea.
Detailed Description
The invention is further described with reference to the following figures and examples, without limiting the scope of the invention to the following:
example 1: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a solid-free drilling fluid, and the modifier is as follows: water + 0.2% PAM + 1.5% modified polyurea.
Example 2: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a solid-free drilling fluid, and the modifier is as follows: water + 0.5% PAM + 2% modified polyurea.
Example 3: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a solid-free drilling fluid, and the modifier is as follows: water + 0.3% PAM + 1.8% modified polyurea.
Example 4: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a finely dispersed drilling fluid, and the modifier is as follows: water, 3 percent of sodium bentonite and 1.5 percent of modified polyurea.
Example 5: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a finely dispersed drilling fluid, and the modifier is as follows: water, 6 percent of sodium bentonite and 2 percent of modified polyurea.
Example 6: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is a finely dispersed drilling fluid, and the modifier is as follows: water, 4 percent of sodium bentonite and 1.8 percent of modified polyurea.
Example 7: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is non-dispersible low solid phase drilling fluid, and the modifier is as follows: water, 2 percent of sodium bentonite, 0.1 percent of CMC, 0.01 percent of PHP and 1.5 percent of modified polyurea.
Example 8: thixotropic modifying agent for water-based drilling fluid
The water-based drilling fluid is non-dispersible low solid phase drilling fluid, and the modifier is as follows: water, 5 percent of sodium bentonite, 0.3 percent of CMC, 0.03 percent of PHP and 2 percent of modified polyurea.
Example 9: a thixotropic modifying agent for water-based drilling fluid,
the water-based drilling fluid is non-dispersible low solid phase drilling fluid, and the modifier is as follows: water, 3 percent of sodium bentonite, 0.2 percent of CMC, 0.02 percent of PHP and 1.8 percent of modified polyurea.
The following experiments illustrate the advantageous effects of the present invention
1 Experimental equipment and experimental method
1.1 Experimental Equipment
(1) Experimental equipment: ZNN-D12S intelligent digital display ten-speed rotational viscometer, SD6B medium pressure water loss instrument, EP-C extreme pressure lubrication instrument, HS-17 magnetic stirrer, DQJ type low speed powerful stirrer and Su's funnel viscometer.
(2) Experimental reagent: modified polyurea, bentonite, PAM, CMC, PHP, BaSO4And purified water.
The modified polyurea is in the form of N-methyl pyrrolidone solution of the modified polyurea, the nonvolatile part of the modified polyurea accounts for 52 percent, and the pH value is nearly neutral.
1.2 Experimental methods
Firstly, carrying out static shear force and thixotropic ring tests on aqueous solutions of modified polyurea liquid with different adding amounts, selecting a relatively proper proportion to add the aqueous solutions into a drilling fluid system without solid phase, fine dispersion, non-dispersion and the like, testing the influence of the aqueous solutions on the main performance indexes of the drilling fluid such as thixotropy, water loss, viscosity, lubrication and the like, testing the temperature adaptability and the actual suspension capacity, and comprehensively evaluating the adaptability of the drilling fluid.
2 thixotropy test of aqueous solution of modified polyurea
2.1 solution static shear test
ZNN-D12S intelligent digital display twelve-speed rotational viscometer can continuously read data at 0.1 second time interval, and can accurately find the maximum value of the shear force. The static shear method is to stir at a high speed of 600r/min for 10s, then to stand for 10s and 10min, respectively, and to use 1/2 with the maximum value measured at a rotation speed of 3r/min as initial cut (G10 '), and final cut (G10'), and the difference Δ τ is generally used to represent the thixotropy strength. The static shear force of the actual drilling fluid can continuously increase along with the increase of time, and the testing time is prolonged in order to better reflect the change rule of the actual drilling fluid along with the change of time. In each test, the measured value after the stirring is carried out again at a high speed of 600r/min for 10s is taken as the standard, and the relative stable value is recorded for reference besides the maximum value so as to more comprehensively reflect the 'diluted' state after the stirring.
The method comprises the following operation steps:
(1) adding the modified polyurea into purified water according to a certain proportion, for example, adding 5g of N-methylpyrrolidone solution of the modified polyurea into 500mL of water, uniformly stirring by adopting a magnetic stirrer, and standing for more than 12 hours for later use;
(2) the ZNN-D12S SmdMed twelve speed rotational viscometer was powered on and connected to a computer, and the regular measurement in the computer control mode was enabled, setting the reading interval to 0.1 seconds.
(3) Stirring the solution to be detected again, pouring the solution to be detected into the sample cup to the scribed line position (350mL), and finishing placement;
(4) mixing with a stopwatch, stirring at 600r/min for 10s, stopping standing for 10s, and cutting at 1/2 with a maximum value of 3r/min as initial cut (G10'); then stirring at high speed of 600r/min for 10s, stopping standing for 10min, and taking 1/2 with the maximum value measured at 3r/min as a final cut (G10'); then stirring at high speed of 600r/min for 10s, stopping standing for 30min, and using 1/2 with the maximum value measured at 3r/min as the static shear force at 30 min. And measuring static shearing forces corresponding to different times of standing for 1 hour, 2 hours, 4 hours, 16 hours and the like by analogy. Wherein the rotation time is controlled to be 10s during the 3r/min test, so that the data of the descending section tends to be stable;
(5) the instrument can automatically store data under each rotation, 10 data values can be recorded every second, the maximum value of the reading is found out by contrasting the data of related 3r/min test, the static shear force value of the solution at the corresponding time is obtained by multiplying 1/2, meanwhile, the stable value after the data is reduced when 3r/min is found out at the end of the data table, and the stable value of the solution shear force when 3r/min is obtained by multiplying 1/2.
The static shear force values of the solutions with different concentrations and adding amounts are measured when the solutions are kept still for different time periods and are shown in table 1, a curve of the relation between the static shear force and the keeping still time is drawn according to the static shear force values and is shown in figure 1, and the stable shear force values of the solutions at 3r/min are recorded and are shown in table 2.
TABLE 1 test chart for static shear force of aqueous solution
Remarking: the actual measurement value of 600r/min shearing force 1Pa, 300r/min shearing force 0.35Pa, 200r/min shearing force 0.1Pa and the measurement value below 200rpm of the purified water is 0.
Table 23r/min aqueous solution shear force stability value test table
According to the relevant data of the static shear force test, the solution performance rule can be summarized as follows:
(1) the static shear force value of the solution is in a trend of increasing along with the increase of the modified polyurea;
(2) under the same concentration, the static shear force is in a trend of continuously rising along with the time extension, a rapid growth process is carried out before about 200min, the growth amplitude is reduced, and the rapid solidification side of the 'rapid weak gel' can be better embodied.
(3) No matter how large the static shear force is actually measured, the stable shear force value after stirring can be quickly reduced to a lower value, the weak side of 'quick weak gel' is well reflected, and the performance of the property changing at once is very dribbling. For example, when a 2% strength solution is left standing for 16 hours, the static shear force is 58Pa, and the shear force value is reduced to 2.1Pa within a few seconds, and the reduction is huge.
(4) The stable shear force value at the rotating speed of 3r/min is in a whole rising trend along with the increase of time and addition.
(5) From the analysis of delta tau data, the thixotropy is not obviously improved when the addition amount is 0.5 percent and 1 percent, the effects are moderate when the addition amount is 1.5 percent and 2 percent, and the effects are larger when the addition amount is 2.5 percent and 3 percent. Therefore, a 2% addition was chosen to further test its effect on drilling fluid.
2.2 solution thixotropic Ring test
A thixotropic ring method is adopted to test the corresponding relation between the shearing force and the rotating speed of the solution with different concentrations, and the speed is reduced from low to high and then gradually reduced. Because the specification is not specified, the operation time of each circulation is controlled to be about 5min, so that the stable reading is achieved as much as possible under each speed gradient, and two incompletely coincident curves, namely thixotropic rings, appear on the shear force under the same concentration in the speed rising section and the speed falling section, so that the qualitative analysis is carried out.
The method comprises the following operation steps:
(1) adding the modified polyurea into purified water according to a certain proportion, for example, adding 5g of N-methylpyrrolidone solution of the modified polyurea into 500mL of water, uniformly stirring by adopting a magnetic stirrer, and standing for more than 12 hours for later use;
(2) the ZNN-D12S SmdMed twelve speed rotational viscometer was powered on and connected to a computer, and the regular measurement in the computer control mode was enabled, setting the reading interval to 1 second.
(3) Stirring the solution to be detected again, pouring the solution to be detected into the sample cup to the scribed line position (350mL), and finishing placement;
(4) the data test is carried out in the sequence of the rotating speed of 1r/min → 2r/min → 3r/min → 10r/min → 20r/min → 30r/min → 60r/min → 100r/min → 200r/min → 300r/min → 600r/min → 300r/min → 200r/min → 100r/min → 60r/min → 30r/min → 20r/min → 10r/min → 6r/min → 3r/min → 2r/min → 1r/min, and the stopping time of each rotating speed is about 10s, so that the speed under the speed gradient tends to be stable.
(5) The instrument can automatically store data under each rotation, find a stable value of the data under each rotation speed in a contrast manner, multiply the stable value by 1/2 to be used as a shear force under the rotation speed, and draw a shear force-speed gradient semilogarithmic thixotropic curve for analysis, wherein the shear force of an ascending section and the shear force of a descending section under the same rotation speed possibly have differences.
(6) The apparent viscosity at each rotational speed is obtained by dividing the shear value by the actual speed gradient value at that rotational speed, and the unit Pa.S is converted into mPa.S by multiplying the apparent viscosity by 1000, for example, the speed gradient of 3r/min is 5.1S-1The speed of 600r/min is 1022S-1。
The corresponding relationship between the shear force of the solution with different concentrations and the different rotating speeds is shown in table 3, and a shear force-speed gradient semilogarithmic thixotropic curve is drawn by the corresponding relationship as shown in fig. 2. Because the difference of the shear force data is small and is not beneficial to observation, the shear force is converted into the apparent viscosity under different speed steps, and a viscosity-speed step semilogarithmic thixotropic curve is drawn as shown in figure 3.
TABLE 3 aqueous solution thixotropic ring shear force test meter
According to the relevant data of the thixotropic ring method test, the property rule of the solution can be summarized as follows:
(1) the solution shearing force increases and decreases with the increase of the speed ladder, and the shearing force of the same speed ladder is generally lower than that of the ascending section in the rotating speed descending section, which shows that the solution is obviously fluid related to the shearing time.
(2) The shear force (viscosity) curves of the solutions show an overall law that the solutions tend to overlap at high speed steps and separate and increase in difference at low speed steps.
(3) When the solution is sheared from low speed to high speed, the internal structure is not destroyed and shows higher viscosity, and when the solution is sheared from high speed to low speed, the internal structure is not formed in time and shows lower viscosity, so that a thixotropic ring is formed.
(4) The apparent viscosity of the solutions with different concentrations is close and small in high-speed shearing, the viscosity of the solutions with different concentrations is rapidly increased in low-speed shearing, for example, the apparent viscosity of all the solutions with different concentrations is below 40mPa.S at 600r/min, the apparent viscosity can be maximally close to 3500mPa.s at 1r/min, and the shear dilution effect is obvious.
(5) The viscosity is increased rapidly along with the trend of zero shearing rate, namely, the solution is in the process of dynamic and static transformation from low speed to static, and the change of related properties is obvious. We say that this phenomenon is similar to the difference between "kinetic friction" and "maximum static friction", except that the transition of the solid is accomplished instantaneously, while the solution has a transition zone of intense change, the apparent viscosity reaches a maximum when completely at rest, becomes a very low strength "weak gel" like solid, and as the standing time lengthens, the internal structure begins to further strengthen in the form of static shear (or strength).
3 testing the performance of drilling fluid by using modified polyurea
3.1 drilling fluid formulation
Drilling fluid is prepared one day ahead before relevant tests are carried out, 2 percent of N-methyl pyrrolidone solution of modified polyurea is added by taking the mass of water as a base number for comparative tests, and the formula of 3 basic drilling fluids is shown in the following table 4.
Table 4 drilling fluid basic formula table
| Numbering | Basic formula | |
| 1# | Water + 0.3% PAM | Solid- |
| 2# | Water + 4% sodium bentonite | Finely dispersed |
| 3# | Water, 3% sodium bentonite, 0.2% CMC and 0.02% PHP | Non-dispersed low solid phase drilling fluid |
3.2 drilling fluid static shear test
The drilling fluid basic formula and the formula added with the modified polyurea are compared and tested, the static shear force values measured after standing for different times are shown in the following table 5, a curve of the relation between the static shear force and the standing time is drawn by the static shear force values and is shown in the figure 4, and the drilling fluid shear force stable value at 3r/min is recorded and is shown in the table 6.
TABLE 5 drilling fluid static shear force test table
Table 63 r/min drilling fluid shear force stable value test meter
According to the relevant data tested by the static shear force method, the performance rule of the drilling fluid acted by the drilling fluid can be summarized as follows:
(1) after the modifier is added, the static shear force of different drilling fluids in the step 3 is obviously increased, particularly the increase amplitude is maximum in the first 30min, the actually measured data dispersion is also high, and the static shear force has a slight descending trend due to the interaction influence among materials in the later period, particularly under the condition of bentonite;
(2) the drilling fluid added with the modifier is influenced by other materials, and the shear force stability value after 3r/min shearing is increased relative to a 2% pure solution. The solid-free drilling fluid with the formula No. 1 is in a continuous growth process and is less influenced by PAM, and the finely dispersed drilling fluid with the formula No. 2 containing bentonite has a process of obviously increasing to reducing;
(3) the drilling fluid added with the modifying agent has a shear force stability value after shearing at 3r/min which is about 50 percent of a static shear force value.
3.3 testing of thixotropic Ring of drilling fluid
The drilling fluid basic formula and the formula added with the modifier are used for comparison and test, the corresponding relation of the shear force of the drilling fluid under different rotating speeds is tested and shown in the following table 7, and a shear force-speed gradient semilogarithmic thixotropic curve is drawn by the drilling fluid basic formula and the formula added with the modifier and is shown in fig. 5. Because the difference of the shear force data is small, the observation is not facilitated, the shear force is converted into the apparent viscosity under different speed steps, and a viscosity-speed step semilogarithmic thixotropic curve is drawn as shown in fig. 6.
TABLE 7 drilling fluid thixotropic ring shear force test meter
According to the relevant data tested by the thixotropic ring method, the property rule of the thixotropic ring method acting on the drilling fluid can be summarized as follows:
(1) the drilling fluid added with the modifier can obviously change the thixotropic curve of the drilling fluid with a basic formula, so that the shear force (viscosity) is integrally improved;
(2) the thixotropic curve of the drilling fluid added with the modifying agent is similar to that of a pure solution, which shows that the whole effect is less influenced by other materials;
(3) in the drilling fluid with bentonite, the shearing force (viscosity) in the thixotropic ring tends to be closed as the shearing rate tends to be zero, which is different from that of a pure solution.
3.4 drilling fluid conventional Performance index test
To evaluate the impact of the modified polyurea on the drilling fluid as a whole, the conventional performance index test data is now collated as in table 8 below.
TABLE 8 conventional Performance test Table for drilling fluid
According to the relevant data of the conventional performance index test, the rule can be summarized as follows:
(1) the drilling fluid added with the modifier can increase the viscosity of the funnel by about one time;
(2) the drilling fluid added with the modifier can obviously improve the dynamic-plastic ratio, the 2# finely dispersed drilling fluid has the most obvious effect, and the 1# solid-free drilling fluid and the 2# non-dispersed drilling fluid are slightly inferior;
(3) the drilling fluid added with the modifier can reduce water loss, the 2# low solid phase fine dispersion drilling fluid and the 3# non-dispersion drilling fluid have the most obvious effect, the 1# non-solid phase drilling fluid is the worst, and the modifier and bentonite possibly have a more obvious synergistic effect;
(4) the filtrate of the No. 1 solid-free drilling fluid added with the modifier still has obvious thixotropy, which indicates that the particle range of the macromolecule and the modified polyurea belongs to or is lower than the range of 1-100nm of colloid particles, and the filter paper can be well penetrated. However, the filtrates obtained after the modifier is added to No. 2 and No. 3 are clear water and have no touch change, which indicates that the thixotropy is a comprehensive result after the modified polyurea and the bentonite act synergistically under the condition of the bentonite, and the modified polyurea is strongly adsorbed to the bentonite, so that the modified polyurea cannot pass through the filter paper.
(5) The modified polyurea can improve the lubricity of the drilling fluid to a certain extent.
3.5 high temperature Adaptation analysis
A2% modified polyurea aqueous solution is newly prepared, and a thixotropic ring test is carried out under the conditions of room temperature (11 ℃), water bath heating (75 ℃) and cooling to room temperature (13 ℃) after heating, so that the adaptability of the modified polyurea aqueous solution to the temperature is evaluated, the influence of other materials of the drilling fluid can be avoided, and specific data are shown in the following table 9.
TABLE 9 shear force high temperature adaptability test meter for aqueous solution
From the above table data, the following conclusions can be drawn:
(1) the solution obviously loses the shearing force at high temperature, the thixotropic action is damaged, and white precipitates in the solution can be found to increase in the heating process;
(2) the solution is reduced from high temperature to room temperature, the shear force is recovered to some extent, but the effect is not obvious, and the adaptability to high temperature is not strong overall.
3.6 actual suspension Performance analysis of weighting agent
Newly preparing 2% modified polyurea water solution, adding barite powder according to 30% of the water mass, testing the actual suspension capacity of the modified polyurea water solution, and the data is shown in the following table 10, which shows that the modified polyurea water solution has stronger actual suspension capacity on a weighting material.
TABLE 10 suspending ability results
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention.
Claims (7)
1. The modified polyurea is applied to the thixotropic modifying agent of the water-based drilling fluid.
2. The use according to claim 1, wherein said modified polyurea is in the form of a solution of modified polyurea in N-methylpyrrolidone.
3. The use according to claim 2, wherein the modified polyurea is present in the drilling fluid system at a concentration of 1.5-2% by weight.
4. A water-based drilling fluid thixotropy improver, characterized by comprising the modified polyurea of claim 1.
5. The thixotropy improver for water-based drilling fluid according to claim 4, wherein said water-based drilling fluid is a solid-free drilling fluid, and the formula of the improver is as follows: water, 0.2-0.5% of PAM and 1.5-2% of modified polyurea.
6. The thixotropy improver for water-based drilling fluids according to claim 4, wherein said water-based drilling fluid is a finely dispersed drilling fluid, and the improver is prepared from the following formula: water, 3-6% of sodium bentonite and 1.5-2% of modified polyurea.
7. The thixotropy improver for water-based drilling fluids according to claim 4, wherein said water-based drilling fluid is a non-dispersed low solid phase drilling fluid, and the usage formula of the improver is as follows: water, 2-5% of sodium bentonite, 0.1-0.3% of CMC, 0.01-0.03% of PHP and 1.5-2% of modified polyurea.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100009873A1 (en) * | 2007-10-22 | 2010-01-14 | Elementis Specialties , Inc. | Thermally Stable Compositions and Use Thereof in Drilling Fluids |
| CN107849209A (en) * | 2015-07-27 | 2018-03-27 | 毕克化学有限公司 | Urea urethane for rheology control |
| CN110330329A (en) * | 2019-04-03 | 2019-10-15 | 武汉理工大学 | A kind of thixotropy ceramic paste material and preparation method thereof for stereolithography |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100009873A1 (en) * | 2007-10-22 | 2010-01-14 | Elementis Specialties , Inc. | Thermally Stable Compositions and Use Thereof in Drilling Fluids |
| CN107849209A (en) * | 2015-07-27 | 2018-03-27 | 毕克化学有限公司 | Urea urethane for rheology control |
| CN110330329A (en) * | 2019-04-03 | 2019-10-15 | 武汉理工大学 | A kind of thixotropy ceramic paste material and preparation method thereof for stereolithography |
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