CN110577827A - Isolating fluid for deepwater well cementation and preparation method thereof - Google Patents
Isolating fluid for deepwater well cementation and preparation method thereof Download PDFInfo
- Publication number
- CN110577827A CN110577827A CN201810596141.2A CN201810596141A CN110577827A CN 110577827 A CN110577827 A CN 110577827A CN 201810596141 A CN201810596141 A CN 201810596141A CN 110577827 A CN110577827 A CN 110577827A
- Authority
- CN
- China
- Prior art keywords
- spacer fluid
- parts
- fluid
- well cementation
- drilling fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/48—Density increasing or weighting additives
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a spacer fluid for deep water well cementation and a preparation method thereof, and belongs to the field of well cementation operation. The spacer fluid for deep water well cementation comprises the following components in parts by weight: 2-8 parts of suspension stabilizer, 1-4 parts of diluent, 1-190 parts of weighting agent and 100 parts of water. Wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate. The spacer fluid has the following effects: the drilling fluid has good intermiscibility with the drilling fluid and the cement paste, and the rheological property after intermiscibility is good, so that the problems of cement paste flocculation, thickening time shortening and the like can not be caused. The effect of isolating the drilling fluid and the cement paste is good, and mutual pollution between the cement paste and the drilling fluid can be effectively prevented. The drilling fluid can be effectively diluted, and the displacement efficiency of the spacer fluid to the drilling fluid is improved. The method can be applied to the deepwater cementing operation at 0-30 ℃, and is beneficial to the construction of the deepwater cementing operation.
Description
Technical Field
The invention relates to the field of well cementation operation, in particular to a spacer fluid for deep water well cementation and a preparation method thereof.
Background
Deepwater field hydrocarbon resources represent a large proportion of the total hydrocarbon reserves, such as hydrate layers (e.g., methane) deposited at the bottom of deepwater bodies. However, the deepwater environmental temperature is low, the stratum is soft, the fracture pressure is low, and the fluid movement is easy to occur, so the deepwater cementing operation is a key link of oil and gas exploitation. In deep water cementing operation, cement slurry is required to be used for displacing drilling fluid so as to play a role in supporting a casing and sealing a stratum between a well wall and the casing. However, the compatibility between cement slurry and drilling fluid is poor, and during the displacement process, the cement slurry and drilling fluid mixed section is easy to form a cement structure, which is not beneficial to the smooth operation of deepwater well cementation. The above problems can be solved by pumping spacer fluid between the cement slurry and the drilling fluid. Therefore, it is necessary to provide a spacer fluid for deep water cementing.
The related art provides a spacer fluid for deep water cementing, which includes: super absorbent resin, a tackifier, polyol, soluble salt, water and an auxiliary agent. The components in the insulating liquid are matched with each other, so that the insulating liquid can play a role in heat insulation and heat preservation, and avoid the risk caused by sudden temperature drop in the deepwater field.
The inventors found that the related art has at least the following problems:
The insulating liquid provided by the related technology improves the heat insulation performance, but has poor insulating effect on drilling fluid and cement paste.
disclosure of Invention
The embodiment of the invention provides a spacer fluid for deep water well cementation and a preparation method thereof, which can solve the technical problems. The specific technical scheme is as follows:
On one hand, the embodiment of the invention provides a spacer fluid for deepwater cementing, which comprises the following components in parts by weight:
2-8 parts of suspension stabilizer, 1-4 parts of diluent, 1-190 parts of weighting agent and 100 parts of water;
wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
in one possible design, the suspension stabilizer comprises the attapulgite, the bentonite, the carboxymethyl cellulose and the modified guar gum in a mass ratio of 58-62: 28-32: 6-10: 1-3.
in one possible design, the suspension stabilizer includes the attapulgite, the bentonite, the carboxymethyl cellulose, the modified guar gum in a mass ratio of 60:30:8: 2.
in one possible design, the diluent is selected from at least one of sodium tripolyphosphate, polyethylene glycol, sodium lignosulfonate, sulfonated tannin, sodium chloride, calcium chloride, potassium chloride, and the diluent also includes water.
In one possible design, the diluent comprises the following components in percentage by mass:
40% of sodium lignosulfonate, 10% of sulfonated tannin, 5% of sodium chloride, 5% of calcium chloride and 40% of water.
In one possible design, the weighting agent is barite.
In another aspect, an embodiment of the present invention provides a preparation method of a spacer fluid for deep water well cementation, where the preparation method is applied to any one of the above mentioned spacer fluids for deep water well cementation, and the preparation method includes:
Adding a suspension stabilizer into water according to the weight parts of the components, carrying out first stirring, and dissolving to obtain a first mixed solution;
Adding a diluent into the first mixed solution, carrying out second stirring, adding a weighting agent after dissolution, carrying out third stirring, and obtaining the spacer fluid for deep water well cementation after uniform mixing;
Wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
in one possible design, the first stirring time is 2-5 min, and the rotating speed is 3800-4200 rpm;
The time of the second stirring and the third stirring is 8-12 min, and the rotating speed is 3800-4200 rpm.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
According to the spacer fluid for deep water well cementation provided by the embodiment of the invention, each component in the spacer fluid is stably and uniformly dispersed by adding the suspension stabilizer comprising the components and cooperating with the diluent. The good rheological property of the spacer fluid is kept by adding the diluent and cooperating with the suspension stabilizer. By adding the weighting agent and cooperating with other components, the density of the spacer fluid can be adjusted, and the density of the spacer fluid is ensured to be between the drilling fluid and the cement slurry so as to meet the isolation effect. When the spacer fluid is used, the following effects are achieved: (1) the drilling fluid has good intermiscibility with the drilling fluid and the cement paste, and the rheological property after intermiscibility is good, so that the problems of cement paste flocculation, thickening time shortening and the like can not be caused. (2) The effect of isolating the drilling fluid and the cement paste is good, and mutual pollution between the cement paste and the drilling fluid can be effectively prevented. (3) The drilling fluid can be effectively diluted, and the displacement efficiency of the spacer fluid to the drilling fluid is improved. (4) The method can be applied to the deepwater cementing operation at 0-30 ℃, and is beneficial to the construction of the deepwater cementing operation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a graph of cement slurry thickening provided in application example 3;
FIG. 2 is a graph of the thickening of a mixed slurry at a drilling fluid to cement slurry volume ratio of 10:90 provided in application example 3;
FIG. 3 is a graph showing the thickening of a mixed slurry when the volume ratio of the drilling fluid, the spacer fluid and the cement slurry provided in application example 3 is 20:10: 70.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
In a first aspect, an embodiment of the present invention provides a spacer fluid for deep water well cementation, where the spacer fluid includes the following components in parts by weight:
2-8 parts of suspension stabilizer, 1-4 parts of diluent, 1-190 parts of weighting agent and 100 parts of water. Wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
According to the spacer fluid for deep water well cementation provided by the embodiment of the invention, each component in the spacer fluid is stably and uniformly dispersed by adding the suspension stabilizer comprising the components and cooperating with the diluent. The good rheological property of the spacer fluid is kept by adding the diluent and cooperating with the suspension stabilizer. By adding the weighting agent and cooperating with other components, the density of the spacer fluid can be adjusted, and the density of the spacer fluid is ensured to be between the drilling fluid and the cement slurry so as to meet the isolation effect. When the spacer fluid is used, the following effects are achieved: (1) the drilling fluid has good intermiscibility with the drilling fluid and the cement paste, and the rheological property after intermiscibility is good, so that the problems of cement paste flocculation, thickening time shortening and the like can not be caused. (2) The effect of isolating the drilling fluid and the cement paste is good, and mutual pollution between the cement paste and the drilling fluid can be effectively prevented. (3) The drilling fluid can be effectively diluted, and the displacement efficiency of the spacer fluid to the drilling fluid is improved. (4) The method can be applied to the deepwater cementing operation at 0-30 ℃, and is beneficial to the construction of the deepwater cementing operation.
wherein, the parts by weight of the suspension stabilizer can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts and the like. The diluent may be present in 1 part, 2 parts, 3 parts, 4 parts, etc.
The density of the spacer fluid is controlled between the drilling fluid and the cement slurry, so that the effects of isolation and displacement can be effectively improved. Wherein, the weight portions of the weighting agent can be 1 portion, 10 portions, 20 portions, 23 portions, 40 portions, 60 portions, 77 portions, 80 portions, 100 portions, 110 portions, 113 portions, 130 portions, 150 portions, 162 portions, 170 portions, 183 portions, 190 portions and the like.
The weighting agent is added and is cooperated with the suspension stabilizer and the diluent to adjust the density of the spacer fluid conveniently. In addition, the suspension stabilizer has a suspension stabilizing effect on the weighting agent, and the uniformity and stability of the isolation liquid provided by the embodiment of the invention are ensured.
As an example, the spacer fluid comprises the following components in parts by weight:
4-6 parts of suspension stabilizer, 2-3 parts of diluent, 30-160 parts of weighting agent and 100 parts of water.
The weight parts of the components are set, so that the effect of the components can be fully exerted, the isolation fluid has a good isolation effect, the displacement efficiency of the isolation fluid on the drilling fluid is improved, and the requirements of deepwater well cementation operation are met.
In the embodiment of the invention, the suspension stabilizer, the diluent and the weighting agent are compounded, so that the weighting agent and the diluent can be stably and uniformly dispersed in water, and the stability and the uniformity of the spacer fluid are ensured. In order to provide the above-mentioned effects excellent after the suspension stabilizer synergistically acts with other components, the following examples are given:
The suspension stabilizer comprises attapulgite, bentonite, carboxymethyl cellulose and modified guar gum in a mass ratio of 58-62: 28-32: 6-10: 1-3.
The attapulgite, the carboxymethyl cellulose, the modified guar gum and the bentonite have good suspension and stability, and the four components are compounded according to the mass percentage, so that the suspension stabilizer has excellent suspension property and stability, and the weighting agent and the diluent are favorably dispersed stably and uniformly. Moreover, the components are low in price and easy to obtain.
The attapulgite and the bentonite belong to inorganic minerals, can be hydrated and uniformly dispersed in water, and form a bridged network structure through the interaction of layer bonds. The attapulgite has good saline-alkali resistance, is beneficial to seawater slurry preparation, has strong rapid hydration capability, and reduces free water in slurry through adsorption. Carboxymethyl cellulose and modified guar gum belong to high molecular materials, are dissolved and stretched in water to form molecular coils, and the carboxymethyl cellulose is completely dissolved in water in a low-temperature environment and increases the viscosity of the solution, so that the modified guar gum has good alkali resistance; the modified guar gum solution has the shearing and diluting characteristics, and the flow performance of the solution is ensured while the suspension effect of the solution is realized. The attapulgite, the carboxymethyl cellulose, the guar gum and the bentonite are compounded for use, so that the synergistic effect of a network bridge and a molecular coil is realized, the suspension stability of the solution is efficiently improved, the isolation liquid is suspended to weight solid-phase particles in a low-temperature environment, and the drilling fluid is displaced through density difference.
wherein the mass ratio of the attapulgite, the bentonite, the carboxymethyl cellulose and the modified guar gum can be 57:32:10:1, 58:32:9:1, 62:28:7:3, 60:30:8:2 and the like.
As an example, the suspension stabilizer includes attapulgite, bentonite, carboxymethyl cellulose, modified guar gum in a mass ratio of 60:30:8: 2.
The suspension stabilizer is prepared by mixing the components in percentage by mass, so that the suspension and stability performance can be fully exerted after the attapulgite, the bentonite, the carboxymethyl cellulose and the modified guar gum are compounded.
In the embodiment of the invention, the diluent can play a role in diluting the suspension stabilizer and the weighting agent, so that the spacer fluid has good rheological property. After the spacer fluid is mixed with the drilling fluid and the cement slurry, the diluent can ensure that the mixing section is not too thick, and the fluidity of the mixing section of the spacer fluid, the drilling fluid and the cement slurry is ensured, so that the deepwater well cementation operation is smoothly carried out.
The diluent is at least one selected from sodium tripolyphosphate, polyethylene glycol, sodium lignosulfonate, sulfonated tannin, sodium chloride, calcium chloride and potassium chloride, and the diluent also comprises water.
I.e., the diluent is selected from any one, two, three, or a mixture of all of the foregoing.
As an example, the diluent comprises the following components in percentage by mass:
37-42% of sodium lignosulphonate, 8-12% of sulfonated tannin, 4-6% of sodium chloride, 4-6% of calcium chloride and the balance of water.
The components of the diluent are arranged in such a way, so that the components are conveniently cooperated with one another to achieve a good diluting effect. Moreover, the components are low in price and easy to obtain.
The ionic sulfonic acid group, the sulfonated group, the sodium ion, the calcium ion and the chloride ion in the diluent can be adsorbed on attapulgite, bentonite, carboxymethyl cellulose and modified guar gum in the suspension stabilizer, electric double layers of the attapulgite, the bentonite and other ions are properly adjusted, the extending length of a carboxymethyl cellulose molecular chain and a guar gum molecular chain is changed, cementation, flocculation and the like between the attapulgite, the bentonite, the carboxymethyl cellulose and the modified guar gum and between the ionic modified guar gum and other molecules, ions and suspended matters in drilling fluid and cement paste are avoided, and the mixed slurry has good rheological property.
The mass percentage of the sodium lignin sulfonate can be 37%, 38%, 39%, 40%, 41%, 42% and the like. The mass percentage of the sulfonated tannin can be 8%, 9%, 10%, 11%, 12% and the like. The mass percentage of sodium chloride may be 4%, 5%, 6%, etc. The calcium chloride may be present in an amount of 4%, 5%, 6%, etc.
As an example, the diluent comprises the following components in percentage by mass:
40% of sodium lignosulphonate, 10% of sulfonated tannin, 5% of sodium chloride, 5% of calcium chloride and 40% of water.
the mass percentages of the components are set in such a way, so that the components can fully play a role after being compounded, the diluent has an excellent diluting effect, and the problems of cement paste flocculation, thickening time shortening and the like can not be caused after the spacer fluid is mixed with the drilling fluid and the cement paste. Besides, the spacer fluid can effectively dilute the drilling fluid and improve the displacement efficiency of the spacer fluid to the drilling fluid.
In the embodiment of the invention, the weighting agent and other components are cooperated to adjust the density of the isolation fluid, so that the density of the isolation fluid is ensured to be between the drilling fluid and the cement slurry, and the isolation effect is met. As one example, the weighting agent is barite.
after the barite is compounded with the suspension stabilizer and the diluent, the barite can be stably and uniformly dispersed in the spacer fluid, so that the stability of the spacer fluid is ensured. In addition, the barite is low in price and easy to obtain.
In a second aspect, an embodiment of the present invention further provides a preparation method of a spacer fluid for deepwater well cementation, where the method is applied to any one of the above mentioned spacer fluids for deepwater well cementation, and the method includes:
adding the suspension stabilizer into water according to the parts by weight of the components, carrying out first stirring, and dissolving to obtain a first mixed solution.
and adding a diluent into the first mixed solution, carrying out second stirring, adding a weighting agent after dissolution, carrying out third stirring, and uniformly stirring to obtain the spacer fluid for deep water well cementation.
wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
The preparation method is simple, can be prepared on site, and is beneficial to deepwater well cementation operation. In addition, the prepared spacer fluid for deep water well cementation can be applied to deep water well cementation operation at 0-30 ℃, and has good isolation and displacement effects.
Wherein the first stirring time is 2-5 min, such as 2min, 3min, 4min, 5 min. The number of revolutions is 3800 to 4200rpm, and may be 3800rpm, 3850rpm, 3900rpm, 3950rpm, 4000rpm, 4050rpm, 4100rpm, 4150rpm, 4200rpm, or the like.
the time of the second stirring and the third stirring is 8-12 min, such as 8min, 9min, 10min, 11min, 12min, etc., and the rotation speed is 3800-4200 rpm, such as 3800rpm, 3850rpm, 3900rpm, 3950rpm, 4000rpm, 4050rpm, 4100rpm, 4150rpm, 4200rpm, etc.
The time and the rotating speed of the first stirring, the second stirring and the third stirring are set, so that the components are fully dissolved or mixed, and the effect of each component can be fully exerted.
The present invention will be further described below by way of specific examples.
In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer. The raw materials are conventional products which can be obtained commercially by manufacturers and specifications.
The drilling fluid is purchased from Bohai star engineering science and technology Limited in Tianjin.
Oil well G-grade cement in the cement paste is purchased from Shandong Lin' 26384victoria Special Cement Co., Ltd, and other component materials are purchased from oil Bohai Star engineering technology Co., Ltd in Tianjin. The cement slurry has a conventional density water cement ratio of 0.44.
Example 1
The embodiment provides a spacer fluid for deep water well cementation, which is prepared by the following method: 2.85g of attapulgite, 1.6g of bentonite, 0.5g of carboxymethyl cellulose and 0.05g of modified guar gum are added into 100g of water, stirred at the rotating speed of 4000rpm for 3min and dissolved for 30min to obtain a first mixed solution. Then, 0.4g of sodium lignosulfonate, 0.1g of sulfonated tannin, 0.05g of sodium chloride, 0.05g of calcium chloride and 0.4g of water are added into the first mixed solution, stirred at the rotating speed of 4000rpm for 10min and uniformly dissolved to obtain the deep water well cementing spacer fluid provided by the embodiment.
example 2
The embodiment provides a spacer fluid for deep water well cementation, which is prepared by the following method: 2.32g of attapulgite, 1.28g of bentonite, 0.36g of carboxymethyl cellulose and 0.04g of modified guar gum are added into 100g of water, stirred at the rotating speed of 4000rpm for 3min and dissolved for 30min to obtain a first mixed solution. And then adding 0.8g of sodium lignosulfonate, 0.2g of sulfonated tannin, 0.1g of sodium chloride, 0.1g of calcium chloride and 0.8g of water into the first mixed solution, stirring for 10min at the rotating speed of 4000rpm, uniformly dissolving, then adding 28g of barite, stirring for 10min at the rotating speed of 4000rpm, and uniformly stirring to obtain the deep water well cementing spacer fluid provided by the embodiment.
Example 3
The embodiment provides a spacer fluid for deep water well cementation, which is prepared by the following method: 2.07g of attapulgite, 0.93g of bentonite, 0.23g of carboxymethyl cellulose and 0.1g of modified guar gum are added into 100g of water, stirred at the rotating speed of 4000rpm for 3min and dissolved for 30min to obtain a first mixed solution. And then adding 1.2g of sodium lignosulfonate, 0.3g of sulfonated tannin, 0.15g of sodium chloride, 0.15g of calcium chloride and 1.2g of water into the first mixed solution, stirring for 10min at the rotating speed of 4000rpm, after uniform dissolution, adding 60g of barite, stirring for 10min at the rotating speed of 4000rpm, and obtaining the deep water well cementing spacer fluid provided by the embodiment after uniform dissolution.
Example 4
the embodiment provides a spacer fluid for deep water well cementation, which is prepared by the following method: adding 4g of attapulgite, 2g of xanthan gum, 0.27g of welan gum and 0.07g of bentonite into 100g of water, stirring at 4000rpm for 3min, and dissolving for 30min to obtain a first mixed solution. And then adding 1.6g of sodium lignosulfonate, 0.4g of sulfonated tannin, 0.2g of sodium chloride, 0.2g of calcium chloride and 1.6g of water into the first mixed solution, stirring for 10min at the rotating speed of 4000rpm, after uniform dissolution, adding 97g of barite, stirring for 10min at the rotating speed of 4000rpm, and obtaining the deep water well cementing spacer fluid provided by the embodiment after uniform dissolution.
Application example 1
This application example evaluates the density and rheological properties of the spacer fluids for deep water cementing provided in examples 1 to 6. The specific evaluation process comprises the following steps: the deepwater cementing spacer fluids provided in examples 1 to 6 were sampled and numbered as No. 1, No. 2, No. 3, No. 4, No. 5, and No. 6, respectively. Under the condition of room temperature, the density of No. 1 to No. 6 spacer fluid samples is respectively obtained by a densitometer, and specific parameters are detailed in Table 1.
A sample of No. 1 spacer fluid was taken at room temperature, stirred in an atmospheric densifier for 20min, and then tested for plastic viscosity and shear force at 600rpm, 300rpm, 200rpm, 100rpm, 6rpm, and 3rpm with a six-speed rotational viscometer, respectively. Similarly, the plastic viscosity and the dynamic shear force of samples nos. 2 to 6 were obtained by a six-speed rotational viscometer at 600rpm, 300rpm, 200rpm, 100rpm, 6rpm, and 3rpm, respectively. The specific parameters are detailed in table 2.
TABLE 1
TABLE 2
As can be seen from Table 1, the density of the spacer fluid for deep water cementing can be adjusted by adding different amounts of barite. As is clear from table 2, the rheological properties of the spacer fluids for deep water well cementing provided in examples 1 to 6 were good and adjustable. Therefore, the density and the rheological property of the spacer fluid for deep water well cementation provided by the embodiment of the invention are adjustable, and the spacer fluid is conveniently applied to deep water well cementation operation under different conditions.
Application example 2
The application example evaluates the rheological properties of the spacer fluid for deep water well cementation provided in example 4 at different temperatures. The specific evaluation process comprises the following steps: 6 samples were obtained from the spacer fluid for deepwater cementing provided in example 4, and the plastic viscosity and the dynamic shear force at 600rpm, 300rpm, 200rpm, 100rpm, 6rpm, and 3rpm were measured with a six-speed rotational viscometer at 5 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, and 50 ℃, respectively. The specific parameters are detailed in table 3.
TABLE 3
As can be seen from table 3, the deep water well cementing spacer fluid provided in example 4 has a slightly increased plastic viscosity and dynamic shear force with an increase in temperature, but maintains good stability. The isolation liquid can keep stable rheological property within the range of 0-50 ℃. Therefore, the spacer fluid for deep water well cementation provided by the embodiment of the invention can keep stable rheological property within the range of 0-50 ℃, and meets the requirements of deep water well cementation operation.
application example 3
The application example evaluates the intermiscibility of the deep water well cementing spacer fluid provided in example 3 with drilling fluid, cement slurry, and mixed slurry of the drilling fluid and the cement slurry, and the thickening time of the cement slurry. The specific evaluation process is as follows:
(1) The spacer fluid for deep water well cementation provided in the embodiment 3 is selected as a sample and prepared into mixed slurry with drilling fluid, and 7 parts of mixed slurry with different volume proportions are prepared, and are numbered as a, b, c, d, e, f and g in sequence. After the mixed slurry was added to an atmospheric thickener at 20 ℃ and stirred for 20min, the plastic viscosity and the dynamic shear force of each mixed slurry were measured at 600rpm, 300rpm, 200rpm, 100rpm, 6rpm, and 3rpm, respectively, using a six-speed rotational viscometer. The specific parameters are detailed in table 4.
TABLE 4
As can be seen from table 4, the isolation fluid for deep water well cementation provided in example 3 has relatively stable plastic viscosity and dynamic shear force after being mixed with the drilling fluid, which indicates that the isolation fluid has good compatibility with the drilling fluid.
(2) The spacer fluid for deep water well cementation provided in example 3 was selected as a sample and mixed with cement slurry to prepare 7 mixed slurries with different volume ratios, which were numbered h, i, j, k, l, m, n in sequence. After the mixed slurry was added to an atmospheric thickener at 20 ℃ and stirred for 20min, the plastic viscosity and the dynamic shear force of each mixed slurry were measured at 600rpm, 300rpm, 200rpm, 100rpm, 6rpm, and 3rpm, respectively, using a six-speed rotational viscometer. The specific parameters are detailed in table 5.
TABLE 5
As can be seen from table 5, the barrier fluid for deep water well cementation provided in example 3 has relatively stable plastic viscosity and dynamic shear strength after being mixed with cement slurry, which indicates that the barrier fluid has good compatibility with the cement slurry.
(3) The spacer fluid for deep water well cementation provided in the embodiment 3 is selected as a sample, and is prepared into mixed slurry together with drilling fluid and cement slurry, so that 11 parts of mixed slurry with different volume percentages are prepared, and the serial numbers of the mixed slurry are 01, 02, 03, 04, 05, 06, 07, 08, 09, 10 and 11 in sequence. And (2) at the temperature of 20 ℃, obtaining the fluidity of the mixed pulp by a fluidity ring measurement method (selecting a flat plate and a ring body, placing the ring body on the flat plate, then inversely placing the mixed pulp in the ring body, extracting the ring body, enabling the mixed pulp to flow and diffuse on the flat plate, and measuring the diffusion distance of the mixed pulp, namely the fluidity). The specific parameters are detailed in table 6.
TABLE 6
| numbering | Cement paste | Drilling fluid | Spacer fluid | Fluidity/cm |
| 01 | - | 100％ | - | 23.5 |
| 02 | 100％ | - | - | 20 |
| 03 | - | - | 100％ | 26 |
| 04 | 50％ | 50％ | - | 14 |
| 05 | 70％ | 30％ | - | 11 |
| 06 | 30％ | 70％ | - | 18 |
| 07 | 33.30％ | 33.30％ | 33.30％ | 20 |
| 08 | 70％ | 20％ | 10％ | 18.5 |
| 09 | 20％ | 70％ | 10％ | 19 |
| 10 | 5％ | - | 95％ | 26 |
| 11 | 95％ | - | 5％ | 19 |
As can be seen from Table 6, the fluidity of the mixed slurry of the cement slurry and the drilling fluid is poor, the fluidity is less than 18cm, and the fluidity of the mixed slurry is obviously improved after the isolating liquid is added, wherein the fluidity of the mixed slurry is both more than 18cm, which indicates that the isolating liquid can effectively improve the conditions of poor fluidity and thickening of the drilling fluid and the cement slurry after the contact, so that the fluidity of the mixed slurry can be obviously improved.
(4) The spacer fluid for deep water well cementation provided in the embodiment 3 is selected as a sample, and is prepared into mixed slurry together with drilling fluid and cement slurry, wherein 3 parts of mixed slurry with different volume percentages are prepared, and are numbered as 12, 13 and 14 in sequence. The thickening time of the slurry was measured by a high temperature and high pressure thickener at 20 ℃. And the attached figures 1, 2 and 3 are made (in the attached figures, the leftmost ordinate is the temperature, the right ordinate is the consistency; in the figures, the curve is a temperature-time curve in a smooth way, the curve is a consistency-time curve in a smooth way and then in an increasing way, and the test result is the time when the consistency reaches 100Bc under the set temperature condition) so as to conveniently observe the thickening curve of the mixed slurry. The specific parameters are detailed in table 7.
TABLE 7
As can be seen from table 7 and fig. 1 to 3, the thickening time of the mixed slurry of the drilling fluid and the cement slurry is significantly shorter than that of the cement slurry, and the thickening time of the mixed slurry of the drilling fluid and the cement slurry is significantly recovered after the spacer fluid for deep water cementing provided in example 3 is added, so that the requirements of deep water cementing operation can be met.
In conclusion, the spacer fluid for deep water well cementation provided by the embodiment of the invention has good intermiscibility with drilling fluid, cement slurry, drilling fluid and cement slurry, the mixed slurry has good fluidity, the thickening time of the mixed slurry cannot be obviously shortened, and the requirements of deep water well cementation operation can be met.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The spacer fluid for deepwater well cementation is characterized by comprising the following components in parts by weight:
2-8 parts of suspension stabilizer, 1-4 parts of diluent, 1-190 parts of weighting agent and 100 parts of water;
Wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
2. The spacer fluid as claimed in claim 1, wherein the suspension stabilizer comprises the attapulgite, the bentonite, the carboxymethyl cellulose and the modified guar gum in a mass ratio of 58-62: 28-32: 6-10: 1-3.
3. the spacer fluid of claim 2, wherein the suspension stabilizer comprises the attapulgite, the bentonite, the carboxymethyl cellulose, and the modified guar gum in a mass ratio of 60:30:8: 2.
4. The spacer fluid of claim 3, wherein the diluent is selected from at least one of sodium tripolyphosphate, polyethylene glycol, sodium lignosulfonate, sulfonated tannin, sodium chloride, calcium chloride, potassium chloride, and further comprises water.
5. The spacer fluid as claimed in claim 4, wherein the diluent comprises the following components in percentage by mass:
40% of sodium lignosulfonate, 10% of sulfonated tannin, 5% of sodium chloride, 5% of calcium chloride and 40% of water.
6. The spacer fluid of any one of claims 1 to 5, wherein the weighting agent is barite.
7. a preparation method of the spacer fluid for deepwater well cementation, which is applied to the spacer fluid for deepwater well cementation according to any one of claims 1 to 6, and comprises the following steps:
Adding a suspension stabilizer into water according to the weight parts of the components, carrying out first stirring, and dissolving to obtain a first mixed solution;
adding a diluent into the first mixed solution, carrying out second stirring, adding a weighting agent after dissolution, carrying out third stirring, and obtaining the spacer fluid for deep water well cementation after uniform mixing;
Wherein the suspension stabilizer is at least one selected from attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate.
8. The preparation method according to claim 7, wherein the first stirring time is 2-5 min, and the rotation speed is 3800-4200 rpm;
the time of the second stirring and the third stirring is 8-12 min, and the rotating speed is 3800-4200 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810596141.2A CN110577827B (en) | 2018-06-11 | 2018-06-11 | Isolating fluid for deepwater well cementation and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810596141.2A CN110577827B (en) | 2018-06-11 | 2018-06-11 | Isolating fluid for deepwater well cementation and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110577827A true CN110577827A (en) | 2019-12-17 |
| CN110577827B CN110577827B (en) | 2022-06-03 |
Family
ID=68809410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810596141.2A Active CN110577827B (en) | 2018-06-11 | 2018-06-11 | Isolating fluid for deepwater well cementation and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110577827B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548775A (en) * | 2020-05-27 | 2020-08-18 | 河南省恒信阳光实业有限公司 | Mixed slurry treating agent and preparation method thereof |
| CN112608724A (en) * | 2020-12-16 | 2021-04-06 | 成都西油华巍科技有限公司 | Gel spacer fluid for oil and gas fields and preparation method thereof |
| CN113355070A (en) * | 2021-07-13 | 2021-09-07 | 中石化石油工程技术服务有限公司 | High-temperature-resistant plug pressing fluid for well cementation of oil and gas well and preparation method thereof |
| CN115895615A (en) * | 2022-11-23 | 2023-04-04 | 安东石油技术（集团）有限公司 | Isolation agent, isolation liquid and preparation method of isolation liquid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858146A (en) * | 2005-12-26 | 2006-11-08 | 西南石油学院 | Anti-pollution high efficiency isolation liquid and preparing method |
| CN102337108A (en) * | 2011-10-28 | 2012-02-01 | 西南石油大学 | Efficient anti-pollution isolation liquid for well cementation and preparation method thereof |
| CN104449606A (en) * | 2013-09-13 | 2015-03-25 | 天津中油渤星工程科技有限公司 | High temperature resistant well-cementing spacer fluid and preparation method thereof |
| CN104830294A (en) * | 2015-01-20 | 2015-08-12 | 西南石油大学 | High-temperature-resistant anti-pollution well cementation spacer fluid and preparation method thereof |
-
2018
- 2018-06-11 CN CN201810596141.2A patent/CN110577827B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858146A (en) * | 2005-12-26 | 2006-11-08 | 西南石油学院 | Anti-pollution high efficiency isolation liquid and preparing method |
| CN102337108A (en) * | 2011-10-28 | 2012-02-01 | 西南石油大学 | Efficient anti-pollution isolation liquid for well cementation and preparation method thereof |
| CN104449606A (en) * | 2013-09-13 | 2015-03-25 | 天津中油渤星工程科技有限公司 | High temperature resistant well-cementing spacer fluid and preparation method thereof |
| CN104830294A (en) * | 2015-01-20 | 2015-08-12 | 西南石油大学 | High-temperature-resistant anti-pollution well cementation spacer fluid and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 杨香艳等: "一种新型广谱水基固井前置液体系的研究 ", 《钻井液与完井液》 * |
| 谭文礼等: "BCS隔离液室内研究 ", 《石油天然气学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548775A (en) * | 2020-05-27 | 2020-08-18 | 河南省恒信阳光实业有限公司 | Mixed slurry treating agent and preparation method thereof |
| CN111548775B (en) * | 2020-05-27 | 2023-04-11 | 河南省恒信阳光实业有限公司 | Mixed slurry treating agent and preparation method thereof |
| CN112608724A (en) * | 2020-12-16 | 2021-04-06 | 成都西油华巍科技有限公司 | Gel spacer fluid for oil and gas fields and preparation method thereof |
| CN113355070A (en) * | 2021-07-13 | 2021-09-07 | 中石化石油工程技术服务有限公司 | High-temperature-resistant plug pressing fluid for well cementation of oil and gas well and preparation method thereof |
| CN113355070B (en) * | 2021-07-13 | 2022-10-11 | 中石化石油工程技术服务有限公司 | High-temperature-resistant plug pressing fluid for well cementation of oil and gas well and preparation method thereof |
| CN115895615A (en) * | 2022-11-23 | 2023-04-04 | 安东石油技术（集团）有限公司 | Isolation agent, isolation liquid and preparation method of isolation liquid |
| CN115895615B (en) * | 2022-11-23 | 2023-11-10 | 安东石油技术（集团）有限公司 | Isolating agent, isolating liquid and preparation method of isolating liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110577827B (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110577827B (en) | Isolating fluid for deepwater well cementation and preparation method thereof | |
| CN103555304B (en) | A kind of oil base flushing spacer fluid and preparation method thereof | |
| US6907928B2 (en) | Storable cementitious slurries containing boric acid and method of using the same | |
| US8540025B2 (en) | Wellbore servicing compositions and methods of making and using same | |
| CN104449606B (en) | A kind of high temperature resistance well cementation insulating liquid and preparation method | |
| CN102757778B (en) | Fracturing fluid capable of resisting high salinity water quality | |
| CN105001841B (en) | Improve emulsification flushing spacer fluid of oil base drilling fluid cementing quality and preparation method thereof | |
| CN105754564A (en) | Preparation method of filtrate reducer for drilling fluid | |
| CN109439310A (en) | high-temperature guanidine gum fracturing fluid and preparation method thereof | |
| CN105331352B (en) | Seawater-based fracturing fluid and preparation method thereof | |
| CN101161760A (en) | Oil well cement-injection pad fluid admixture and preparation method | |
| CN110872507A (en) | Non-crosslinked fracturing fluid, preparation method and application thereof and non-crosslinked fracturing fluid thickener | |
| CN103483500B (en) | A kind of high temperature resistance strong absorptive fluid loss additive and application thereof | |
| CN106221683B (en) | Preparation method of well cementation spacer fluid for water-based drilling fluid | |
| CN107540260B (en) | Low-temperature cement early strength agent for well cementation and cement containing low-temperature cement early strength agent | |
| CN106800924A (en) | High-temperature-resistant xanthan gum fracturing fluid and preparation method thereof | |
| CN112552886B (en) | Superhigh temperature resistant 180 ℃ variable density solid-free tackifying type well completion fluid and workover fluid | |
| CN108165243B (en) | Konjac gum/sodium alginate solid-phase-free composite drilling fluid and preparation method thereof | |
| CN110343513B (en) | Flushing fluid, preparation method thereof and flushing fluid for deepwater well cementation | |
| CN115181557A (en) | Oil displacement type flushing isolation fluid and preparation method thereof | |
| CN112552885A (en) | Superhigh temperature resistant 180 ℃ tackifying type well completion fluid and workover fluid | |
| CN103923326B (en) | The preparation method of liquid welan gum | |
| CN110846013A (en) | Well cementation flushing fluid for oil-based drilling fluid and preparation and application methods thereof | |
| CN110669487B (en) | Fluidity control agent and preparation method thereof | |
| CN114214049B (en) | Preparation method of solid-free tackifying workover fluid for ultra-deep ultra-high temperature oil and gas wells |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |