CN113667463A - Oil displacement isolation liquid for medium-low temperature oil-based drilling fluid and preparation method thereof - Google Patents
Oil displacement isolation liquid for medium-low temperature oil-based drilling fluid and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses an oil displacement isolation liquid for medium-low temperature oil-based drilling fluid and a preparation method thereof, which solve the problems that the existing oil displacement isolation liquid has high cost and the performance needs to be further improved, and comprise the following components in parts by weight: 400 parts of water, 60-100 parts of surfactant, 6-10 parts of separant, 760 parts of weighting agent and 0.2-0.3 part of defoaming agent; the separant consists of 1:1-2 mass ratio of the Xipurine gum to the superfine silicon dioxide. The invention has better oil displacement performance, low cost, high displacement efficiency of cleaning solution and good cleaning effect of oil film; the method has low cost and low energy consumption.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to an oil-displacing isolation liquid for a medium-low temperature oil-based drilling fluid and a preparation method thereof.
Background
Along with the continuous deepening of exploration and development to unconventional oil and gas reservoirs, particularly the number of shale gas wells is increased year by year, the application of the oil-based drilling fluid is more and more extensive. The use of oil-based drilling fluids results in oil wetting of the well wall and casing surfaces, which plays an important role in increasing the rate of penetration and reducing the complexity of downhole operations. However, the main problems with oil-based drilling fluids for cementing are: the oil-based drilling fluid is difficult to displace and clean the interface, the rheological property of the mixed slurry is poor, the mixed slurry strength is seriously reduced, and the like. In particular, the oil-containing mud cake exists on the well wall, the oil-based drilling fluid is adhered to the outer wall of the sleeve, the open hole section is long, the flushing effect of the water-based completion fluid on the oil film is poor, the cementing strength of the well cementation cement sheath and the quality of the first interface and the second interface well cementation are affected, and the well cementation quality is further difficult to improve. Meanwhile, with the continuous maturity of shale gas drilling well completion technology, the investment cost of a single well is reduced year by year, the well cementation cost is reduced by about 55%, the isolation agent is a key additive for ensuring the sedimentation stability of the isolation fluid, generally, high molecular materials such as modified starch, xanthan gum and the like are used as the front liquid isolation agent, the aim of ensuring the sedimentation stability of the front liquid is fulfilled by utilizing the principle of improving the liquid phase viscosity, the purchase price of the components is always high, in order to ensure the well cementation quality of a shale production zone under the low-cost condition, the isolation fluid with better oil displacement performance and lower cost must be researched, and the displacement efficiency of cleaning fluid and the cleaning effect of an oil film are improved.
Publication No. CN111527180A discloses a spacer fluid for thermal insulation, which comprises an acidic nanosilica dispersion and an alkaline activator. The acidic nanosilica dispersion comprises silica nanoparticles and a stabilizer such as a carboxylic acid. The basic activator comprises an alkanolamine. The solution forms a spacer fluid having a pH greater than 7 and less than or equal to 12 by a mixture of an acidic nanosilica dispersion and a basic activator, and causes the spacer fluid to form a spacer gel when heated to a temperature in the range of 100 ° F to 300 ° F. The technical scheme is only suitable for isolating hydrocarbon-containing fluid from the surrounding environment, and because the gel is formed after the influence of temperature, the fluidity of the gel is lost, so that the problems of poor fluidity and high construction safety risk of the cementing construction pad fluid exist.
At present, with the wide application of the oil-based drilling fluid in shale gas wells, the research on oil displacement isolation fluid is gradually increased, and the oil displacement isolation fluid has wide research value and application prospect. Therefore, the research of the low-cost and high-efficiency oil displacement isolation liquid suitable for medium and low temperature under the condition of low investment cost is particularly important, so that the cleaning efficiency of the well wall oil-based mud cake and the casing wall oil film is improved, and the displacement efficiency in the cementing operation process is improved on the premise of controlling the cost of the oil displacement isolation liquid.
Disclosure of Invention
The invention aims to solve the technical problems and provides the oil displacement isolation liquid for the medium and low temperature oil-based drilling fluid, which has the advantages of better oil displacement performance, low cost, high displacement efficiency of cleaning liquid and good cleaning effect of an oil film.
The invention also provides a preparation method of the oil displacement isolation liquid, which has low cost and low energy consumption and is easy to produce.
The technical scheme comprises the following components in parts by mass: 400 parts of water, 60-100 parts of surfactant, 6-10 parts of separant, 760 parts of weighting agent and 0.2-0.3 part of defoaming agent;
the separant consists of 1:1-2 mass ratio of the Xipurine gum to the superfine silicon dioxide.
The average grain diameter of the superfine silicon dioxide is 25-45 μm.
The xanthylic gum is composed of polysaccharide high molecular compounds D-glucose, D-mannose and D-glucuronic acid according to the mass ratio of 2:2: 1.
The weighting agent is at least one of iron ore powder or barite powder.
The average particle size of the iron ore powder is 37-71 mu m, and the average particle size of the barite powder is 10-27 mu m.
The surfactant is prepared by mixing 0.5-1:1:1-1.5 mass ratio of polysorbate, coconut oil diethanolamide and sodium dodecyl benzene sulfonate.
The defoaming agent is a polyether defoaming agent.
The preparation method of the oil displacement isolation liquid for the medium-low temperature oil-based drilling fluid comprises the following steps:
firstly), sequentially adding and uniformly stirring a nonionic surfactant and an anionic surfactant to form an oil displacement cleaning solution base solution for later use;
secondly), adding a separant into the water, uniformly stirring to form a separant solution, adding a weighting agent, and uniformly stirring to form a weighted separant solution;
and thirdly), adding the oil displacement cleaning solution base liquid into the weighted isolation liquid, adding the defoaming agent, and uniformly stirring to form the oil displacement isolation liquid.
In the second step), stirring at variable speed is adopted after the separant is added, and the stirring speed is controlled to be 1000-1200 rpm; after the weighting agent is added, variable speed stirring is adopted, and the stirring speed is controlled to be 1500-2000 rpm.
In the third step), adding the base liquid of the oil displacement cleaning liquid into the weighted isolation liquid by adopting a glass rod drainage method; after the addition of the defoaming agent, variable speed stirring is adopted, and the stirring speed is controlled to be 500-800 rpm. And (3) controlling different stirring speeds in the step two) and the step) to fully and uniformly mix the raw materials and reduce the generation of bubbles.
In order to solve the problems in the prior art, the inventor carries out intensive research on the existing isolation liquid, and finds that all high polymer materials based on the principle of improving the viscosity of the liquid phase have the problem of high cost. Therefore, the inventor changes the traditional thinking of thickening through chemical reaction, and the isolating agent in the components adopts the mixture of the Xipurine gum and the superfine silicon dioxide, wherein the Xipurine gum can play a role in improving the viscosity of a liquid phase, the superfine silicon dioxide plays a role in physically filling gaps among particles, the combination of the Xipurine gum and the superfine silicon dioxide can achieve the effect of ensuring the sedimentation stability of the isolating solution at a low temperature, and also solves the problem of difficult mixing caused by overhigh viscosity of the liquid phase due to the simple use of the Xipurine gum as the isolating agent, the preferred mass ratio of the Xipurine gum to the superfine silicon dioxide is 1:1-2, the purchase cost of the Xipurine gum is less than half of that of a high molecular material, the cost of the superfine silicon dioxide is lower, and when the Xipurine gum and the superfine silicon dioxide are compounded, the cost of the isolating agent can be greatly reduced by more than half, and the requirement of low cost is met; on the other hand, the iron ore powder and/or barite powder used as weighting agents are large in particle size, the characteristic that the ultrafine silicon dioxide is small in particle size is ingeniously utilized, chemical reaction is not generated between the ultrafine silicon dioxide and other materials, the ultrafine silicon dioxide is physically dispersed and filled between the iron ore powder and/or the barite powder, aggregation of weighting particles can be prevented, and a supporting effect between particles can be achieved. The average particle size of the iron ore powder is 37-71 mu m, the average particle size of the barite powder is 10-27 mu m, the effect of the physical filling of the ultrafine silicon dioxide is directly weakened when the average particle size is too large, and the liquid phase viscosity is improved when the average particle size is too small, so that the mixing is difficult; the ultrafine silica preferably has an average particle diameter of 25 to 45 μm, and too large will not achieve a particle gradation, and too small will increase the number of ultrafine silica particles between the weighted particles to affect the viscosity of the liquid phase. Researches find that the two can enable the oil-displacing and isolating liquid to form the optimal and stable state under the grading, thereby improving the performances of the oil-displacing and isolating liquid in various aspects such as fluidity, small sedimentation stability and the like.
Furthermore, the surfactant can be selected from ionic or nonionic surfactants, preferably, the surfactant is prepared by mixing polysorbate, coconut oil diethanolamide and sodium dodecyl benzene sulfonate, wherein the polysorbate and the coconut oil diethanolamide are nonionic surfactants, the sodium dodecyl benzene sulfonate is an anionic surfactant, and when the polysorbate and the coconut oil diethanolamide are mixed according to the mass ratio of 0.5-1:1:1-1.5, the oil-based mud cake can be effectively cleaned through the wetting reversal effect.
The oil-displacing separation liquid is suitable for medium-low temperature oil-based drilling fluid at the temperature of 30-90 ℃, preferably water-in-oil-based drilling fluid, the oil-water ratio of the oil-water separating liquid is 70: 30-90: 10, the density range of the oil-water separating liquid is 1.30-1.90 g/cm3, and the demulsification voltage is more than 400V.
Has the advantages that:
1) the product of the invention has good oil-based mud cake cleaning efficiency which can reach more than 88%;
2) the product of the invention has the preferred density of 1.45g/cm3-1.90g/cm3, good sedimentation stability and the difference of the upper and lower densities of the liquid under the condition of 30-90 ℃ and normal pressure of less than 0.02g/cm3The cleaning efficiency of annular space injection replacement and the stable gas layer pressure are ensured;
3) the product of the invention has lower preparation cost, and the cost of the separant is reduced by 45 to 55 percent;
4) the product has strong anti-pollution capability, good compatibility with two phases and three phases of oil-based drilling fluid and cement paste, and no thickening for more than 300min due to the thickening of the three phases of 7:2:1 and 1:1: 1;
5) the preparation method is simple, and has low production cost, low equipment investment and low energy consumption.
The efficient oil-displacing isolation fluid used in the oil-based drilling fluid environment has the characteristics of low preparation cost, high cleaning efficiency, efficient displacement, good wetting reversal effect, good settling stability, strong pollution resistance and the like, and can meet the technical requirements of the cement slurry pad fluid in the medium-low temperature and oil-based drilling fluid environments.
Drawings
FIG. 1 is a graph of the anti-contamination thickening of the product of example 1 of the present invention at a 7:3 ratio of the flooding isolation fluid to the oil-based drilling fluid;
FIG. 2 is a graph showing the anti-contamination thickening curve of the product of example 1 in the case that the ratio of cement paste to oil-based drilling fluid to flooding spacer fluid is 1:1: 1;
FIG. 3 is a graph showing the anti-contamination thickening curve of the product of example 1 in the case that the ratio of the cement slurry to the oil-based drilling fluid to the flooding spacer fluid is 7:2: 1.
Detailed Description
Example 1:
the invention provides an oil-displacing isolation liquid for medium-low temperature oil-based drilling fluid, which comprises the following components: 400ml of water, 60g of surfactant (the mass ratio of polysorbate to coconut oil diethanolamide to sodium dodecyl benzene sulfonate is 0.5:1:1), 6g of separant (the mass ratio of guanine gum to ultrafine silicon dioxide with the average particle size of 45 mu m is 1:1), 320g of barite powder weighting agent with the average particle size of 10-27 mu m and 0.2g of defoaming agent; wherein the Xipurine gum consists of polysaccharide high molecular compounds D-glucose, D-mannose and D-glucuronic acid according to the mass ratio of 2:2: 1;
the preparation method comprises the following steps:
weighing a nonionic surfactant and an anionic surfactant in a beaker, and uniformly stirring by using a glass rod to form an oil displacement cleaning solution base solution; taking water from a pulp cup, and adding a separant under the variable-speed stirring condition (1000-; continuously adding the barite powder weighting agent under the variable speed stirring condition (1500-; adding the prepared oil displacement cleaning solution base liquid into the weighted isolation liquid by a glass rod drainage method, adding a defoaming agent for defoaming, and uniformly stirring under the variable-speed stirring condition (500 plus 800rpm) to obtain the low-cost and high-efficiency oil displacement isolation liquid with the density of 1.45g/cm under the medium-low temperature condition3。
The properties of the flooding and isolating fluid for the medium and low temperature oil-based drilling fluid prepared in this example are shown in table 1, wherein,
the cleaning efficiency is that a rotary drum of a six-speed rotary viscometer is soaked in oil-based drilling fluid for 20min, so that oil-based mud cakes are formed on the inner wall and the outer wall of the rotary drum, the oil-displacement isolating fluid prepared in the embodiment 1 is placed in an atmospheric thickening instrument for maintenance for 20min and then poured into a slurry cup, the maintenance temperature is 90 ℃, the rotating speed of the six-speed rotary viscometer is set to be 300rpm, the rotary drum of the six-speed rotary viscometer soaked in the oil-based drilling fluid is placed into the slurry cup filled with the oil-displacement isolating fluid prepared in the embodiment 1 for soaking for 10min and then is soaked in the slurry cup filled with water for 2min, and the cleaning efficiency is measured;
normal temperature and pressure rheology: pouring the oil displacement isolation solution prepared in the example 1 into a slurry cup, and measuring the rheological readings of 600 revolutions, 300 revolutions, 200 revolutions, 100 revolutions, 6 revolutions and 3 revolutions respectively; medium-low temperature normal pressure rheology: placing the oil-displacing isolation fluid prepared in the example 1 in a normal-pressure thickener for maintenance for 20min, setting the temperature to be 90 ℃, pouring the maintained oil-displacing isolation fluid into a slurry cup, and respectively measuring rheological readings of 600 revolutions, 300 revolutions, 200 revolutions, 100 revolutions, 6 revolutions and 3 revolutions;
normal temperature and pressure sedimentation stability: pouring the oil-displacing separation solution prepared in the embodiment 1 into a 500ml measuring cylinder, standing for 2 hours, and measuring the density difference of upper, middle and lower liquids in the measuring cylinder;
medium-low temperature normal pressure sedimentation stability: pouring the oil-displacing spacer fluid prepared in the embodiment 1 into a measuring cylinder, placing the measuring cylinder in a normal-pressure thickener, standing for 2 hours, setting the temperature to be 90 ℃, and measuring the density difference of upper, middle and lower liquids in the measuring cylinder after 2 hours of maintenance;
anti-pollution performance: mixing cement slurry and oil displacement isolation fluid in a ratio of 7:3, and mixing the cement slurry, the oil displacement isolation fluid and the oil-based drilling fluid in a mass ratio of 1:1:1 and 7:2:1 respectively, and placing the mixture in a high-temperature high-pressure densifier to perform a thickening experiment, wherein the set temperature is 90 ℃ and the pressure is 40 MPa.
The oil-based drilling fluid is a water-in-oil type oil-based drilling fluid prepared from diesel oil and a 26% calcium chloride aqueous solution, and the oil-water ratio of the oil-based drilling fluid is 70:30 to 90: 10; the weighted density range of the barite is 1.30-1.90 g/cm 3; the apparent viscosity is 35-70 mPa.s; the demulsification voltage is more than 400V.
The results are shown in FIGS. 1-3 and Table 1:
table 1 oil displacement spacer fluid performance experimental data
The efficient oil-displacing separation liquid has the excellent performances of low preparation cost, good sedimentation stability, high cleaning efficiency and strong pollution resistance. When cement slurry and oil displacement isolation fluid are mixed in a ratio of 7:3 and cement slurry, oil displacement isolation fluid and oil-based drilling fluid are mixed in a ratio of 1:1:1 and 7:2:1 respectively, the anti-pollution thickening curves of the product of the embodiment are respectively shown in fig. 1, fig. 2 and fig. 3, and the cleaning efficiency calculation method is as follows, wherein W0 is the mass of a rotary drum of a six-speed rotational viscometer and is in unit g; w1 is the mass in g of a six-speed rotary viscometer drum after standing in cold oil-based drilling fluid for 20 min; w2 is the weight of the rotating drum in g after being cleaned for 10min by the oil-displacing isolation solution, then cleaned for 1min by water, taken down and placed on the absorbent paper to stand for 3 min; eta is cleaning efficiency in unit%.
Example 2:
the invention provides an oil-displacing isolation liquid for medium-low temperature oil-based drilling fluid, which comprises the following components: 400ml of water, 80g of surfactant (the mass ratio of polysorbate to coconut oil diethanolamide to sodium dodecyl benzene sulfonate is 1:1:1), 6g of separant (the mass ratio of guanine gum to superfine silicon dioxide is 1:1), 400g of barite powder weighting agent and 0.2g of defoaming agent; the preparation method is the same as example 1.
Table 2 oil displacement spacer fluid performance experimental data
Example 3:
the invention provides an oil-displacing isolation liquid for medium-low temperature oil-based drilling fluid, which comprises the following components: 400ml of water, 100g of surfactant (the mass ratio of polysorbate to coconut oil diethanolamide to sodium dodecyl benzene sulfonate is 1:1:1.5), 8g of separant (the mass ratio of guanine gum to superfine silicon dioxide is 1:1.5), 760g of barite powder weighting agent and 0.3g of defoaming agent; the preparation method is the same as example 1.
Table 3 oil displacement spacer fluid performance experimental data
Example 4:
the invention provides an oil-displacing isolation liquid for medium-low temperature oil-based drilling fluid, which comprises the following components: 400ml of water, 100g of surfactant (the mass ratio of polysorbate to coconut oil diethanolamide to sodium dodecyl benzene sulfonate is 0.5:1:1), 10g of separant (the mass ratio of guanine gum to superfine silicon dioxide is 1:2), 480g of iron ore powder weighting agent with the particle size of 37-71 mu m and 0.3g of defoaming agent; the preparation method is the same as example 1.
Table 4 oil displacement spacer fluid performance experimental data
Comparative example 1 (no ultrafine silica addition):
the release agent is a gum of Xipurine, as in example 1.
Comparative example 2
The release agent was composed of sildenafil and nano silica having an average particle size of 10 μm, and the rest was the same as in example 1.
Comparative example 3
The release agent consisted of sildenafil and silica having an average particle size of 70 μm, as in example 1. See table 5 for comparative results.
TABLE 5 oil-displacing spacer fluid Performance comparison Experimental data
As can be seen from the above table: under the same density gradient condition, the silxipurine gum used in comparative example 1 can ensure the sedimentation stability under the conditions of normal temperature and normal pressure, wherein the sedimentation stability under the conditions of low temperature and normal pressure is inferior to that of example 1; comparative example 2 the ultrafine silica with a smaller particle size is used as a component material of the separant, which has excellent sedimentation stability, but has higher liquid phase shear force under the conditions of normal temperature and normal pressure and medium and low temperature and normal pressure, and is not beneficial to pump injection in site construction; comparative example 3 the ultrafine silica with larger particle size is used as the component material of the separant, the normal temperature and normal pressure rheology and the medium and low temperature and normal pressure rheology are lower than the other three, the medium and low temperature and normal pressure sedimentation stability is poor, and the function of the ultrafine material physical filling is not exerted.
Claims (10)
1. The oil-displacing isolation liquid for the medium-low temperature oil-based drilling fluid is characterized by comprising the following components in parts by mass: 400 parts of water, 60-100 parts of surfactant, 6-10 parts of separant, 760 parts of weighting agent and 0.2-0.3 part of defoaming agent;
the separant consists of 1:1-2 mass ratio of the Xipurine gum to the superfine silicon dioxide.
2. The oil displacement spacer fluid for medium and low temperature oil based drilling fluids according to claim 1 wherein the ultra fine silica has an average particle size of 25 to 45 μm.
3. The oil displacement spacer fluid for medium and low temperature oil-based drilling fluid according to claim 1 or 2, wherein the silxipurine gum is composed of polysaccharide high molecular compounds of D-glucose, D-mannose and D-glucuronic acid in a mass ratio of 2:2: 1.
4. The oil displacement spacer fluid for the medium and low temperature oil-based drilling fluid according to claim 1 or 2, wherein the weighting agent is at least one of iron ore powder or barite powder.
5. The oil displacement isolation fluid for the medium and low temperature oil-based drilling fluid according to claim 4, wherein the average particle size of the iron ore powder is 37-71 μm, and the average particle size of the barite powder is 10-27 μm.
6. The oil displacement spacer fluid suitable for the medium and low temperature oil-based drilling fluid as claimed in claim 1 or 2, wherein the surfactant is prepared by mixing polysorbate, coconut oil diethanolamide and sodium dodecyl benzene sulfonate in a mass ratio of 0.5-1:1: 1-1.5.
7. The oil displacement spacer fluid for medium and low temperature oil-based drilling fluids according to claim 1 or 2, wherein the defoamer is a polyether defoamer.
8. A method of preparing the oil displacement spacer fluid for medium and low temperature oil based drilling fluids according to any one of claims 1 to 7,
the paint comprises the following components in parts by mass: 400 parts of water, 60-100 parts of surfactant, 6-10 parts of separant, 760 parts of weighting agent and 0.2-0.3 part of defoaming agent; the separant consists of 1:1-2 mass ratio of Xipurine gum to superfine silicon dioxide;
the preparation method comprises the following steps:
firstly), sequentially adding and uniformly stirring a nonionic surfactant and an anionic surfactant to form an oil displacement cleaning solution base solution for later use;
secondly), adding a separant into the water, uniformly stirring to form a separant solution, adding a weighting agent, and uniformly stirring to form a weighted separant solution;
and thirdly), adding the oil displacement cleaning solution base liquid into the weighted isolation liquid, adding the defoaming agent, and uniformly stirring to form the oil displacement isolation liquid.
9. The method for preparing the oil-displacing separation fluid for the medium and low temperature oil-based drilling fluid as claimed in claim 8, wherein in the second step), the separation agent is added, then variable speed stirring is adopted, and the stirring speed is controlled to be 1000-1200 rpm; after the weighting agent is added, variable speed stirring is adopted, and the stirring speed is controlled to be 1500-2000 rpm.
10. The method of preparing an oil displacement spacer fluid for a medium and low temperature oil-based drilling fluid of claim 8, wherein in step three), the flooding cleaning fluid base fluid is added to a weighting spacer fluid; after the addition of the defoaming agent, variable speed stirring is adopted, and the stirring speed is controlled to be 500-800 rpm.
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| US20150299558A1 (en) * | 2012-11-29 | 2015-10-22 | M-I L.L.C | Colloidal silica and polymer system for insulating packer fluids |
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| US20150299558A1 (en) * | 2012-11-29 | 2015-10-22 | M-I L.L.C | Colloidal silica and polymer system for insulating packer fluids |
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