CN114426816B - High-temperature-resistant well cementation spacer fluid and preparation method and application thereof - Google Patents
High-temperature-resistant well cementation spacer fluid and preparation method and application thereof Download PDFInfo
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- CN114426816B CN114426816B CN202010996468.6A CN202010996468A CN114426816B CN 114426816 B CN114426816 B CN 114426816B CN 202010996468 A CN202010996468 A CN 202010996468A CN 114426816 B CN114426816 B CN 114426816B
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a spacer fluid for high-temperature-resistant well cementation, and a preparation method and application thereof. The isolating liquid bag for high-temperature-resistant well cementationThe high-temperature suspension stabilizer comprises superfine silica, silica fume and attapulgite. The high temperature resistant isolating liquid has the adaptation temperature of 30-200 ℃ and the density of 1.00-2.80g/cm 3 The method is adjustable in range, has good compatibility with drilling fluid and cement slurry, is simple and consistent with the on-site water distribution flow, and does not need to add extra operation procedures and time.
Description
Technical Field
The invention relates to the field of oil and gas well cementation, in particular to a spacer fluid composition for high-temperature-resistant well cementation, and a preparation method and application thereof.
Background
In the field of petroleum engineering, well cementation is an important link in the well construction process of oil and gas wells. The well cementation is to pump cement slurry into the annular space between the well bore and the casing through a drill pipe or a casing pipe on the ground through equipment such as a cement pump truck, and finally achieve the purposes of protecting and suspending the casing pipe, sealing complex stratum and the like after the cement slurry is solidified to form a hard cement (stone) ring, so that the subsequent drilling and production are facilitated. Before cementing, the casing and the annular space between the well bore and the casing are filled with drilling fluid, most of the drilling fluid is incompatible with cement slurry, during the construction process of cementing, if the drilling fluid is directly displaced by cement slurry, the cement slurry is directly contacted with the drilling fluid, sticky block-shaped flocculating substances are generated when the cement slurry is polluted by the drilling fluid, the fluidity of the cement slurry is greatly reduced, the pumping pressure of the ground is increased, the cement slurry thickening time is greatly shortened, the cement slurry does not reach a designated position and is solidified in advance, and thus, underground accidents such as 'sausage filling' (cement slurry is solidified in a drill rod or the casing and does not enter the annular space) 'flag inserting rod' (cement slurry does not reach a designated height and is solidified in advance when the cement slurry returns up the annular space) occur.
Therefore, in the well cementation operation, a section of isolation liquid is often injected before cementing, and cement slurry and drilling fluid are isolated by means of the isolation liquid, so that cement slurry pollution caused by direct contact of the isolation liquid and the drilling fluid is avoided. The main function of the isolating liquid is that (1) the cement paste and the drilling liquid are effectively isolated, and the flocculation thickening caused by the contact pollution of the cement paste and the drilling liquid is avoided; (2) The buoyancy effect and the dragging force of the suspended solid particles are utilized to wash out mud cakes, the well bore is cleaned, the displacement effect is enhanced, the wettability of the surface of the casing and the well wall is changed, the cementing strength of a first interface and a second interface of well cementation is improved, and the quality of well cementation is improved; (3) Controlling the collapse of an underground unstable stratum, establishing pressure balance between a cementing process and the stratum, and realizing the control of the collapse of the stratum and the stability of fluid pressure; (4) Buffer is used in low pressure formations, formations with leakage problems or risks.
Based on the functions, the density of the isolating liquid is generally between that of the drilling liquid and that of the cement paste, and the density is generally in the range of 1.40-2.00g/cm 3 According to the difference of density, need use solid-phase particles such as slags, silica flour, barite, iron ore powder, manganese powder to carry out density adjustment, unlike cement, these solid-phase particles can not take place the hydration reaction in the spacer fluid, and the suspension of granule mainly relies on thick liquid viscosity, along with the temperature rise, thick liquid viscosity drops sharply, can't suspend the granule to can not effectively wash out the mud cake, subside serious person and can block up the annular space, cause the accident in pit. The poor high-temperature suspension stability of the spacer fluid results in poor temperature resistance, and the required density design requirement is difficult to achieve.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-temperature-resistant isolation fluid for well cementation, which achieves the purpose of effectively isolating cement paste from drilling fluid by using specific components.
According to the first aspect of the invention, the high-temperature-resistant well cementation spacer fluid comprises an adhesion agent, a high-temperature suspension stabilizer, a thickening thixotropic agent, a surfactant, a density regulator and water, wherein the high-temperature suspension stabilizer comprises superfine silica, silica fume and attapulgite.
The term "ultrafine silica" as used herein refers to silica particles having a particle diameter of 10 μm or less to a nanometer scale (1 to 100 nm).
According to some embodiments of the invention, the mass ratio of the ultra-fine silica, the micro silica powder, and the attapulgite is (20-60): 10-40, such as 25 (10-40): 10-40, 35 (10-40): 10-40, 45 (10-40): 10-40, and any value therebetween.
According to some embodiments of the invention, the mass ratio of the ultrafine silica, the silica fume and the attapulgite is (30-50): (20-40): (20-40), such as 35:30:30, 42:30:30, 44:30:30, 46:30:30, 48:30:30, 20:30:30, 40:25:30, 40:30:25 or 45:25:25.
The high-temperature suspension stabilizer has good adsorption and water retention properties, is more completely hydrated particularly at high temperature, can form a grid structure, and improves the suspension capability.
According to some embodiments of the invention, the mass ratio of the high temperature suspension stabilizer and the thickening thixotropic agent is (2.5-30): 1, e.g. 3:1, 4.5:1, 5:1, 6:1, 7:1, 8.5:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 16:1, 17:1, 18:1, 22:1, 24:1, 26:1, 28:1 and any value therebetween.
According to some embodiments of the invention, the mass ratio of the high temperature suspension stabilizer to the thickening thixotropic agent is (4-20): 1.
In some preferred embodiments of the invention, the mass ratio of the high temperature suspension stabilizer to the thickening thixotropic agent is (8-15): 1.
According to some embodiments of the invention, the spacer fluid for well cementing further comprises a retarder and an antifoaming agent.
According to some embodiments of the present invention, the viscosity increasing agent is 5 to 15 parts by mass, the high temperature suspension stabilizer is 5 to 15 parts by mass, the thickening thixotropic agent is 0.5 to 2 parts by mass, the surfactant is 1 to 6 parts by mass, the retarder is 0.5 to 6 parts by mass, the antifoaming agent is 0.5 to 1 to 5 parts by mass, and the density regulator is 50 to 400 parts by mass, based on 100 parts by mass of water.
According to some embodiments of the invention, the thickening thixotropic agent is selected from one or more of polyethylene glycol, polyglycerin fatty acid esters, and polyols.
According to some embodiments of the invention, the thickening thixotropic agent is selected from polyethylene glycols.
The thickening thixotropic agent can generate an additional bridging effect on the grid structure of the suspension stabilizer, and improve the stability of the grid, thereby promoting thickening and thixotropic effects and further improving the suspension capacity.
According to some embodiments of the invention, the adhesion promoting agent is selected from one or more of high molecular cellulose and high molecular polymer.
According to some embodiments of the invention, the viscosity enhancing agent is selected from one or more of methylcellulose, carboxypropylmethylcellulose, carboxyethylcellulose, carboxymethylcellulose, modified starch and xanthan gum.
According to some embodiments of the invention, the viscosity enhancing agent is carboxypropyl methylcellulose, carboxyethyl cellulose, carboxymethyl cellulose, and modified starch.
The polymer adhesive can improve the viscosity of the slurry, well control the water loss, establish the association effect among solid phase particles and improve the stability of the slurry.
According to some embodiments of the invention, the surfactant is selected from one or more of dodecyl polyoxyethylene alcohol ether, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium dodecyl sulfonate, and alkylphenol polyoxyethylene.
According to some embodiments of the invention, the surfactant is dodecyl polyoxyethylene alcohol ether, sodium dodecyl benzene sulfonate, and sodium dodecyl sulfate.
The surfactant can ensure that solid phase particles are not mutually aggregated due to electrostatic repulsive force, so as to achieve the effects of cleaning the well wall and improving wetting.
According to some embodiments of the invention, the retarder is selected from one or more of hydroxycarboxylic acids, organic phosphates, inorganic acids, and AMPS multipolymer.
According to some embodiments of the invention, the retarder is selected from one or more of hydroxycarboxylic acids and AMPS multipolymer.
According to the invention, the retarder is added to improve the compatibility of the spacer fluid, the cement paste and the drilling fluid, so that the cement paste cannot be thickened and solidified in advance due to the reduction of the concentration of the retarder after entering the spacer fluid.
According to some embodiments of the invention, the defoamer is preferably one or more of a silicone-based defoamer and a tributyl phosphate-based defoamer.
According to some embodiments of the invention, the density modifier is selected from one or more of slag, silica fume, barite, iron ore fines, and manganese fines.
The density regulator is used in the invention, and the density can be adjusted arbitrarily (1.00-2.80 g/cm) 3 ) The spacer fluid system of the method can meet the density requirement of most of well cementation working conditions of oil and gas wells on spacer fluid.
According to some embodiments of the invention, the density of the spacer fluid for well cementing is 1.0-2.80g/cm 3 。
According to a second aspect of the invention, the method of preparing a spacer fluid for well cementing comprises mixing an adhesion promoting agent, a high temperature suspension stabilizer, a thickening thixotropic agent, a surfactant, a density regulator and water, and optionally a retarder and an antifoaming agent.
According to some embodiments of the invention, the method comprises the steps of:
s1: mixing an adhesive, a surfactant, and optionally a retarder and an antifoaming agent with water to obtain a first mixed solution;
s2: mixing the first mixed solution obtained in the step S1 with a high-temperature suspension stabilizer to obtain a second mixed solution;
s3: mixing the second mixed solution obtained in the step S2 with a thickening thixotropic agent to obtain the second mixed solution;
s4: and (3) mixing the third mixed solution obtained in the step (S3) with a density regulator to obtain the isolation solution for well cementation.
According to some embodiments of the invention, the method comprises the specific steps of:
sequentially adding 5-15 parts of high polymer viscosity-improving agent, 1-6 parts of surfactant, 0.5-6 parts of retarder and 0.5-1.5 parts of defoamer into 100 parts of fresh water, and stirring at a low speed (2000 r/min) for 1-2min until the materials are uniformly distributed in water; then adding 5-15 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (2000 r/min), and stirring for 1-2min until the materials are uniformly distributed in water; then adding 0.5-2 parts of thickening thixotropic agent under the stirring state of a stirrer at low speed (< 2000 r/min), and stirring for 0.5-2min until the materials are uniformly distributed in water; finally, 50-400 parts of density regulator is added under the stirring state at the medium speed (4000+/-500 r/min) of the stirrer, and the stirrer is stirred at the high speed (12000+/-500 r/min) for 0.5-2min until the materials are uniformly distributed in the water.
According to a third aspect of the present invention, there is provided the use of a spacer fluid for well cementing as described in the first aspect or prepared by the method of the second aspect in well cementing, in particular in deep well and/or ultra-deep well cementing.
The invention has the beneficial effects that:
(1) The isolating liquid system of the invention can adapt to the temperature of 30-200 ℃ and the density of 1.00-2.80g/cm 3 The range is arbitrarily adjustable;
(2) The isolated liquid system of the invention has good sedimentation stability at high temperature<Sedimentation density difference at 200 DEG C<0.02g/cm 3 ；
(3) The salt-resistant spacer fluid system has good salt resistance, salt (NaCl and the like) can be added to prepare the salt-resistant spacer fluid, and the addition of the salt has little influence on the rheological property and the stability of the spacer fluid;
(4) The isolating liquid has good compatibility with most drilling fluid and cement slurry, and flocculation thickening can not be generated after the isolating liquid is mixed with the most drilling fluid and cement slurry;
(5) The preparation method of the spacer fluid is simple and easy to operate, is consistent with the laboratory slurry stirring and on-site water distribution flow, and does not need to add extra operation procedures and time.
Drawings
FIG. 1 shows a thickening test curve of cement paste according to the compatibility test of test example 3 of the present invention;
FIG. 2 shows a plot of the post-mixing thickening test of cement slurries and drilling fluids at a volume percent of 50:50 for the compatibility test of test example 3 according to the present invention;
FIG. 3 shows a plot of a post-mixing thickening experiment of cement slurries and spacer fluids in a volume percentage of 70:30 for the compatibility experiment of test example 3 according to the present invention;
FIG. 4 shows a plot of the thickening test after mixing cement paste with spacer fluid, drilling fluid at a volume percent of 70:20:10 for the compatibility test of test example 3 according to the present invention;
fig. 5 shows the thickening test curves after mixing cement paste and spacer fluid, drilling fluid according to the compatibility test of test example 3 according to the present invention in a volume percentage of 33.3:33.3:33.3.
Detailed Description
The present invention will be further illustrated by the following specific examples, but it should be understood that the scope of the present invention is not limited thereto.
The invention is further illustrated below with reference to the examples, which are merely illustrative of the invention and do not constitute a limitation of the invention in any way.
Unless otherwise indicated, all materials used in the examples are commercially available, and all chemical products mentioned are those commonly used in the prior art. Wherein the modified starch is oxidized modified starch, the molecular weight is 10 ten thousand-15 ten thousand, and the modified starch is produced by Shandong Texas auxiliary agent research and development center; AMPS multipolymer code SCR-4, produced by Shandong Texas auxiliary research and development center; microsilica is produced by Chengdu four-way excellent environmental protection technology limited company; superfine silica, 3000 mesh, manufactured by Shandong Dingxiang technology Co.
Example 1
Raw materials:
high molecular adhesive: the mass ratio of the carboxypropyl methyl cellulose to the carboxyethyl cellulose to the carboxymethyl cellulose to the modified starch is 20:20:20:40;
and (2) a surfactant: dodecyl polyoxyethylene alcohol ether, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate with a mass ratio of 40:30:30;
retarder: AMPS multipolymer;
defoaming agent: an organic silicon defoamer and a tributyl phosphate defoamer with a mass ratio of 50:50;
high temperature suspension stabilizer: superfine silicon dioxide, silica fume and attapulgite in a mass ratio of 40:30:30;
thickening thixotropic agent: polyethylene glycol;
density regulator: density of 2.70g/cm 3 Is not limited to the slag.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 5 parts of high polymer viscosity-increasing agent, 1 part of surfactant, 3 parts of retarder and 0.5 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 5 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; then adding 0.5 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 10:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 0.5min; finally, 50 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.5min at the high speed (12000+/-500 r/min), thus obtaining the density of 1.20g/cm 3 Is a high temperature resistant spacer fluid.
Example 2
Raw materials:
high molecular adhesive: as in example 1;
and (2) a surfactant: as in example 1;
retarder: as in example 1;
defoaming agent: as in example 1;
high temperature suspension stabilizer: as in example 1;
thickening thixotropic agent: as in example 1;
density regulator: density of 2.65g/cm 3 Quartz sand powder of (2).
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, then sequentially adding 6 parts of high polymer viscosity-increasing agent, 1 part of surfactant, 3 parts of retarder and 0.5 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 6 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; then adding 0.5 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 12:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 0.5min; finally, 105 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.5min at the high speed (12000+/-500 r/min), thus obtaining the density of 1.45g/cm 3 Is a high temperature resistant spacer fluid.
Example 3
Raw materials:
high molecular adhesive: as in example 1;
and (2) a surfactant: as in example 1;
retarder: as in example 1;
defoaming agent: as in example 1;
high temperature suspension stabilizer: as in example 1;
thickening thixotropic agent: as in example 1;
density regulator: density of 4.05g/cm 3 Is made of the fine stone powder.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, then sequentially adding 7 parts of high polymer viscosity-increasing agent, 1.5 parts of surfactant, 3 parts of retarder and 0.5 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 7 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; then 0.5 part of thickening thixotropic agent is added under the stirring state of a stirrer at low speed (1500+/-500 r/min)The mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 14:1, and stirring is continued for 0.5min; finally, 100 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.5min at the high speed (12000+/-500 r/min) to obtain the density of 1.60g/cm 3 Is a high temperature resistant spacer fluid.
Example 4
Raw materials:
high molecular adhesive: as in example 1;
and (2) a surfactant: as in example 1;
retarder: as in example 1;
defoaming agent: as in example 1;
high temperature suspension stabilizer: as in example 1;
thickening thixotropic agent: as in example 1;
density regulator: density of 4.05g/cm 3 Is made of the fine stone powder.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Example 5
Raw materials:
high molecular adhesive: as in example 1;
and (2) a surfactant: as in example 1;
retarder: as in example 1;
defoaming agent: as in example 1;
high temperature suspension stabilizer: as in example 1;
thickening thixotropic agent: as in example 1;
density regulator: density of 4.05g/cm 3 Is characterized by having a weight stone powder and a density of 5.05g/cm 3 The ratio of the iron ore powder to the iron ore powder is 1:1.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 12 parts of high polymer viscosity-improving agent, 3 parts of surfactant, 3 parts of retarder and 1 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1.5min; then adding 12 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1.5 parts of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 8:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 250 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 1min at the high speed (12000+/-500 r/min), thus obtaining the density of 2.30g/cm 3 Is a high temperature resistant spacer fluid.
Example 6
The difference from example 4 is that the mass ratio of the high temperature suspension stabilizer to the thickening thixotropic agent is 1.5:1, the other steps are the same as in example 4.
Raw materials: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 6 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 4 parts of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 1.5:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Example 7
The difference from example 4 is that the mass ratio of the high temperature suspension stabilizer to the thickening thixotropic agent is 19:1, the other steps are the same as in example 4.
Raw materials: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9.5 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 0.5 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 19:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Example 8
The difference from example 4 is that the mass ratio of ultrafine silica, silica fume and attapulgite is 10:40:50.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4
High temperature suspension stabilizer: superfine silicon dioxide, silica fume and attapulgite in the mass ratio of 10:40:50;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
100 parts of fresh water is poured into a slurry cup, then 9 parts of high polymer viscosity-improving agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer are sequentially added, and stirring is carried out at a low speed (1500+/-500 r/min) by using a stirrerStirring for 1min; then adding 9 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Example 9
The difference from example 4 is that the polymeric viscosity increasing agent used is carboxypropyl methylcellulose.
Raw materials:
high molecular adhesive: carboxypropyl methyl cellulose;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: same as in example 4;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, then sequentially adding 9 parts of carboxymethyl cellulose, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 1
The difference from example 4 is that the high temperature suspension stabilizer used is bentonite.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: bentonite;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9 parts of bentonite under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 2
The difference from example 4 is that no thickening thixotropic agent is used.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring into a pulp cup100 parts of fresh water, then sequentially adding 9 parts of polymer viscosity-improving agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring for 1min at a low speed (1500+/-500 r/min) by using a stirrer; then adding 10 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 3
The difference from example 2 is that no thickening thixotropic agent is used.
Raw materials:
high molecular adhesive: same as in example 2;
and (2) a surfactant: same as in example 2;
retarder: same as in example 2;
defoaming agent: same as in example 2;
high temperature suspension stabilizer: same as in example 2;
density regulator: as in example 2.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, then sequentially adding 6 parts of high polymer viscosity-increasing agent, 1 part of surfactant, 3 parts of retarder and 0.5 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 6.5 parts of high-temperature suspension stabilizer under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 105 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.5min at the high speed (12000+/-500 r/min), thus obtaining the density of 1.45g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 4
The difference from example 4 is that the high temperature suspension stabilizer used is ultra-fine silica.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: ultrafine silica;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9 parts of superfine silicon dioxide under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 5
The difference from example 4 is that the high temperature suspension stabilizer used is microsilica.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: micro silicon powder;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then the stirring machine is operated at low speed1500+/-500 r/min), adding 9 parts of micro silicon powder under stirring, and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 6
The difference from example 4 is that the high temperature suspension stabilizer used is attapulgite.
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
high temperature suspension stabilizer: attapulgite;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 9 parts of attapulgite in a stirring state of a stirrer at a low speed (1500+/-500 r/min), and continuously stirring for 1.5min; then adding 1 part of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 9:1) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 1min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Comparative example 7
Unlike example 4, the high temperature suspension stabilizer was not used
Raw materials:
high molecular adhesive: same as in example 4;
and (2) a surfactant: same as in example 4;
retarder: same as in example 4;
defoaming agent: same as in example 4;
thickening thixotropic agent: same as in example 4;
density regulator: same as in example 4.
The preparation method comprises the following steps:
pouring 100 parts of fresh water into a slurry cup, sequentially adding 9 parts of high polymer viscosity-increasing agent, 2 parts of surfactant, 3 parts of retarder and 0.8 part of defoamer, and stirring at a low speed (1500+/-500 r/min) for 1min by using a stirrer; then adding 10 parts of thickening thixotropic agent (the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is 0:10) under the stirring state of a stirrer at low speed (1500+/-500 r/min), and continuously stirring for 2min; finally, 232 parts of density regulator is added under the stirring state of the stirring machine at the medium speed (4000+/-500 r/min), and the stirring machine is stirred for 0.8min at the high speed (12000+/-500 r/min) to obtain the density of 2.00g/cm 3 Is a high temperature resistant spacer fluid.
Performance test:
test example 1: suspension stability
Pouring the prepared isolating liquid into a curing slurry cup, then placing the curing slurry cup into a high-temperature high-pressure curing axe for stirring and curing (rotating speed 150 r/min), setting curing temperature (90 ℃,120 ℃, 180 ℃) and pressure (20.7 MPa), heating and boosting time to 60min, closing a stirring motor after the temperature and the pressure reach set values, continuing constant-temperature constant-pressure curing for 120min, measuring the densities of the upper part and the lower part of the curing slurry cup by using a densimeter, and recording the difference between the upper density and the lower density. The experimental results are shown in Table 1, and the upper and lower density differences of the spacer fluid examples 1 to 5 are measured in the test temperature range<0.02g/cm 3 The isolation liquid system has good suspension stability in different temperature ranges. Test experiments of the embodiment 4, the embodiments 6, the embodiment 7 and the comparative embodiment 7 show that the suspension stability of the slurry can be kept better only by using the suspension stabilizer and the thickening thixotropic agent at the same time under the specific compounding proportion (the proportion range given by the invention); general purpose medicineThe test experiments of the embodiment 4 and the embodiment 9 show that the high polymer adhesive in the isolating liquid can keep better suspension stability of the slurry under the high temperature condition; comparative example 1 test experiments show that the high polymer adhesive in the isolating liquid can keep better suspension stability of slurry under the conditions of low and medium temperature; test experiments of examples 2 and 4 and comparative examples 2 and 3 show that the thickening thixotropic agent in the isolating liquid can strengthen the suspending capability of the suspension stabilizer under the condition of higher content of solid phase particles of slurry; the test experiments of the embodiment 4, the embodiment 8 and the comparative examples 4-6 show that only the high-temperature suspension stabilizer with specific compounding ratio (the compounding ratio of the three raw materials provided by the invention) can obtain good effect.
TABLE 1 isolation liquid suspension stability test
Note that: the electron densitometer used was accurate to 0.005g/cm 3
Test example 2: rheological properties
The rheological parameters of the spacer fluid in examples 1-5 were measured using a six-speed rotational viscometer and the experimental results are shown in table 2. From the table, the barrier fluid fluidity index n of the systems with different densities is between 0.6 and 0.8, and the consistency coefficient k is less than 0.8 and is far less than 1, which indicates that the barrier fluid system of the invention has good rheological property.
TABLE 2 isolation flow rheological property test
Note that: plastic viscosity pv=Φ600- Φ300, dynamic shear force yp=0.511× (Φ300-PV), fluidity index n= 3.322lg (Φ600/Φ300), consistency coefficient k=0.511×Φ300/511 n 。
Test example 3: compatibility of spacer fluid with cement slurry and drilling fluid
The cement paste, spacer fluid and drilling fluid were mixed in a certain proportion, and the rheological property and thickening time (experimental temperature 180 ℃, pressure 67MPa, and heating time 60min, and conditions were taken from a certain dry-heated rock well of the green sea basin) were measured, and the results are shown in Table 3. The thickening time of the cement paste is 436min (figure 1), after the cement paste is mixed with the drilling fluid according to the ratio of 1:1, the slurry is subjected to certain flocculation and coalescence, and the thickening time is only 69min (figure 2), which indicates that the cement paste and the drilling fluid are incompatible; after cement paste, spacer fluid and drilling fluid are mixed according to the proportions of 7:3:0, 7:2:1 and 1:1:1 respectively, the slurry is thickened to different degrees, but the slurry still has fluidity, and the slurry is not thickened after being cured at high temperature and high pressure for 440min (the slurry-leading thickening time is 436 min) (fig. 3-5), so that the spacer fluid system has better compatibility with the cement paste and the drilling fluid.
TABLE 3 compatibility experiments
Note that:
the cement paste comprises the following formula: 100 parts of Jiahua G-grade cement, 4 parts of micro-silicon, 3 parts of swelling agent SNP, 4 parts of fluid loss agent DZJ-Y, 4 parts of retarder SCR-3, 0.5 part of early strength agent TFA18, 0.5 part of defoamer DZX and 40 parts of clear water (Jiahua G-grade cement, produced by Jiahua cement plant of Sichuan leshan, produced by Sichuan Cheng Fang, SNP, sichuan Cheng Du Bo, TFA18, tianjin Bao En, DZJ-Y, SCR-3, DZX and produced by land frame of Shandong De). Cement paste density of 1.90g/cm 3 The six-speed viscometer reads: normal temperature:>300/237/174/93/9/5，93℃：>300/181/133/76/6/4；
the formulation of the spacer fluid was the same as in example 3 except that 8 parts of polymeric binder, 8 parts of high temperature suspension stabilizer and 135 parts of the spacer fluid having a density of 4.05g/cm were used 3 The density of the isolating liquid is 1.75g/cm 3 ；
The drilling fluid adopts potassium amino polysulfonate drilling fluid with density of 1.65g/cm for a certain well site of northwest oilfield northwest block 3 The plastic viscosity was 22 mPa.s and the dynamic shear force was 6Pa.
It should be noted that the above-described embodiments are only for explaining the present invention and do not limit the present invention in any way. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (13)
1. A high-temperature-resistant well cementation spacer fluid comprises an adhesive, a high-temperature suspension stabilizer, a thickening thixotropic agent, a surfactant, a density regulator, a retarder, a defoaming agent and water,
based on 100 parts by mass of water, 5-15 parts of the viscosity-raising agent, 5-15 parts of the high-temperature suspension stabilizer, 0.5-2 parts of the thickening thixotropic agent, 1-6 parts of the surfactant, 0.5-6 parts of the retarder, 0.5-1.5 parts of the defoamer and 50-400 parts of the density regulator;
wherein the thickening thixotropic agent is selected from one or more of polyethylene glycol, polyglycerol fatty acid ester and polyalcohol;
the high-temperature suspension stabilizer comprises 20-60% of superfine silicon dioxide, 10-40% of silica fume and 10-40% of attapulgite; the mass ratio of the high-temperature suspension stabilizer to the thickening thixotropic agent is (4-20): 1;
the viscosity increasing agent is one or more selected from methyl cellulose, carboxypropyl methyl cellulose, carboxyethyl cellulose, carboxymethyl cellulose, modified starch and xanthan gum;
the surfactant is one or more selected from dodecyl polyoxyethylene alcohol ether, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium dodecyl sulfonate and alkylphenol polyoxyethylene.
2. The spacer fluid for high temperature resistant well cementation according to claim 1, wherein the mass ratio of the superfine silica, the silica fume and the attapulgite is (30-50): 20-40.
3. The spacer fluid for high temperature resistant well cementation according to claim 1, wherein the mass ratio of the high temperature suspension stabilizer to the thickening thixotropic agent is (8-15): 1.
4. A spacer fluid for high temperature resistant well cementation according to any one of claims 1 to 3, wherein the thickening thixotropic agent is polyethylene glycol.
5. A spacer fluid for high temperature resistant well cementation according to any one of claims 1 to 3, wherein the viscosity increasing agent is carboxypropyl methylcellulose, carboxyethyl cellulose, carboxymethyl cellulose and modified starch.
6. The spacer fluid for high temperature resistant well cementation according to any one of claims 1 to 3, wherein,
the retarder is one or more selected from hydroxycarboxylic acids, organic phosphates, inorganic acids and AMPS multipolymer;
and/or the defoamer is selected from one or more of silicone defoamer and tributyl phosphate defoamer;
and/or the density regulator is selected from one or more of slag, silicon powder, barite, iron ore powder and manganese powder.
7. A spacer fluid for high temperature resistant well cementation according to any one of claims 1 to 3, wherein the surfactant is dodecyl polyoxyethylene alcohol ether, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
8. A spacer fluid for high temperature resistant well cementation according to any one of claims 1 to 3, wherein the density of the spacer fluid for well cementation is 1.0 to 2.80g/cm 3 。
9. A method for preparing a spacer fluid for high temperature resistant well cementation as claimed in any one of claims 1 to 8, comprising mixing an adhesion promoting agent, a high temperature suspension stabilizer, a thickening thixotropic agent, a surfactant, a density regulator and water, and a retarder and an antifoaming agent.
10. The method for preparing the spacer fluid for high temperature resistant well cementation according to claim 9, comprising the following steps:
s1: mixing an adhesive, a surfactant, a retarder and a defoamer with water to obtain a first mixed solution;
s2: mixing the first mixed solution obtained in the step S1 with a high-temperature suspension stabilizer to obtain a second mixed solution;
s3: mixing the second mixed solution obtained in the step S2 with a thickening thixotropic agent to obtain the second mixed solution;
s4: and (3) mixing the third mixed solution obtained in the step (S3) with a density regulator to obtain the isolation solution for high-temperature-resistant well cementation.
11. Use of a spacer fluid for high temperature resistant well cementing according to any one of claims 1 to 8 or prepared according to the method of claim 9 or 10 for well cementing at 30-200 ℃.
12. Use according to claim 11, the well being a deep or ultra-deep well.
13. The use according to claim 11, the well being a hot dry rock well.
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| CN1858146A (en) * | 2005-12-26 | 2006-11-08 | 西南石油学院 | Anti-pollution high efficiency isolation liquid and preparing method |
| CN100572491C (en) * | 2007-10-10 | 2009-12-23 | 中国石油集团渤海钻探工程有限公司 | Oil well cement-injection pad fluid admixture and preparation method |
| CN101775273B (en) * | 2009-01-09 | 2013-04-24 | 中国石油化工股份有限公司 | High-temperature resistance base fluid for well cementing of oil gas well, preparation method and application thereof |
| CN104745156A (en) * | 2013-12-31 | 2015-07-01 | 中国石油化工集团公司 | Oil-gas well cementing spacer fluid having effect of protecting oil and gas reservoir |
| CN104962260A (en) * | 2015-06-15 | 2015-10-07 | 中国石油天然气集团公司 | High-temperature spacer fluid suspension stabilizer for well cementation, preparation method of high-temperature spacer fluid suspension stabilizer and application of high-temperature spacer fluid suspension stabilizer |
| CN105733535A (en) * | 2016-04-08 | 2016-07-06 | 中国石油大学(华东) | Blocking-type well cementation prepad fluid system and composition |
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