CN114196386B - Well cementation spacer fluid composition, well cementation spacer fluid and preparation method and application thereof - Google Patents
Well cementation spacer fluid composition, well cementation spacer fluid and preparation method and application thereof Download PDFInfo
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- CN114196386B CN114196386B CN202010978748.4A CN202010978748A CN114196386B CN 114196386 B CN114196386 B CN 114196386B CN 202010978748 A CN202010978748 A CN 202010978748A CN 114196386 B CN114196386 B CN 114196386B
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
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- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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Abstract
A well cementation spacer fluid composition, a well cementation spacer fluid and a preparation method and application thereof. The invention provides a well cementation spacer fluid composition and a well cementation spacer fluid of the well cementation spacer fluid composition. The well cementation spacer fluid composition comprises a high temperature resistant suspending agent, a high temperature resistant stabilizing agent, a cross-linking agent, a surfactant, a weighting agent and water, wherein the content of the high temperature resistant suspending agent is 3-5%, the content of the high temperature resistant stabilizing agent is 3-5%, the content of the cross-linking agent is 1-3%, the content of the surfactant is 10-13%, and the content of the weighting agent is 100-200% by mass of the water. The spacer fluid can keep better fluidity, suspension property and stability, greatly reduce the risk of pump holding and stratum leaking, efficiently wash the annular space, ensure the effective cementation of a well cementation cement ring, the stratum and a sleeve, and lay a good foundation for the subsequent fracturing construction.
Description
Technical Field
The invention relates to the field of oil and gas well cementation, in particular to a well cementation spacer fluid composition, a well cementation spacer fluid containing the well cementation spacer fluid composition and a preparation method and application thereof.
Background
In the well cementation construction of deep wells, ultra-deep wells and long sealing section horizontal wells, the well bottom temperature is high due to the fact that the well depth is large. The liquids used in the drilling engineering are all high temperature resistant systems. The annular sealing device aims to solve the problem that cement paste and drilling fluid contact with each other and pollute in deep high-temperature well cementation construction, effectively flush the annular space between a sleeve and a stratum and achieve the purpose of effectively sealing the annular space. It is necessary to formulate a suitable spacer fluid system to effectively isolate the cement slurry from the drilling fluid and to efficiently flush the annular volume of the oil-based drilling fluid within a certain time. The existing well cementation spacer fluid for the oil-based drilling fluid can be mature applied under the condition of medium and low temperature (120 ℃), when the bottom temperature exceeds 120 ℃, the suspending agent and the stabilizing agent in the system can lose effectiveness due to the influence of a high-temperature environment in the original spacer fluid formula, so that the spacer fluid has obvious sedimentation phenomenon, the rheological property of the originally designed spacer fluid can be changed, the spacer fluid cannot play the roles of isolation and efficient flushing in well cementation construction, and even accidents of annular space blockage, pump holding and stratum holding are possibly caused due to the serious sedimentation of a weighting material, and finally the failure of the well cementation construction is caused. Therefore, there is a need in the art to develop a high temperature resistant well cementing spacer fluid system to meet the application in deep well and ultra-deep well cementing engineering.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-temperature-resistant well cementation spacer fluid which achieves the aim of effectively isolating cement slurry from drilling fluid by using a specific high-temperature-resistant suspending agent and a specific stabilizer. Meanwhile, the annular space is efficiently flushed by the annular space, so that the annular space is efficiently sealed by cement paste, and the safe and smooth implementation of well cementation construction is ensured.
According to a first aspect of the invention, the well cementing spacer fluid composition comprises a high temperature resistant suspending agent, a high temperature resistant stabilizing agent, a cross-linking agent, a surfactant, a weighting agent and water,
wherein, calculated by the mass of water, the content of the high-temperature resistant suspending agent is 3-5%, the content of the high-temperature resistant stabilizing agent is 3-5%, the content of the cross-linking agent is 1-3%, the content of the surfactant is 10-13%, and the content of the weighting agent is 100-200%.
According to some embodiments of the invention, the high temperature resistant suspending agent is present in an amount of 3-5% by mass of water, e.g., 3.2%, 3.5%, 3.7%, 4.0%, 4.2%, 4.5%, and 4.7% and any value therebetween.
According to some embodiments of the invention, the high temperature stabilizer is present in an amount of 3-5% by mass of water, e.g. 3.2%, 3.5%, 3.7%, 4.0%, 4.2%, 4.5% and 4.7% and any value in between.
According to some embodiments of the invention, the cross-linking agent is present in an amount of 1-3% by mass of water, e.g., 1.2%, 1.5%, 1.7%, 2.0%, 2.2%, 2.5%, 2.7% and any value therebetween.
According to some embodiments of the invention, the surfactant is present in an amount of 10-13% by mass of water, e.g., 10.2%, 10.5%, 10.7%, 11.0%, 11.2%, 11.5%, 11.7%, 12.0%, 12.2%, 12.5%, 12.7% and any value therebetween.
According to some embodiments of the invention, the weighting agent is present in an amount of 100-200% by mass of water, e.g., 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190%, and any value therebetween.
According to some embodiments of the invention, the cementing spacer composition further comprises a dispersant and/or an antifoaming agent.
According to some embodiments of the invention, the dispersant is present in an amount of 1 to 1.5%, such as 1.1%, 1.2%, 1.3%, 1.4% and any value therebetween, based on the mass of water.
According to some embodiments of the invention, the defoamer is present in an amount of 1-2% by mass of water, such as 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% and any value therebetween.
According to some embodiments of the invention, the cementing spacer fluid composition comprises the following components in parts by weight:
according to some embodiments of the invention, the cementing spacer fluid composition further comprises the following components:
1-1.5 parts of a dispersant;
1-2 parts of a defoaming agent.
According to some embodiments of the invention, the high temperature resistant suspending agent comprises bentonite and an AMPS-based multipolymer.
According to some embodiments of the invention, the bentonite is selected from sodium bentonite.
According to some embodiments of the invention, the bentonite is a sodium bentonite of the OCMA type.
According to some embodiments of the invention, the mass ratio of bentonite to AMPS-based multipolymer is (2-4): 1.
According to some embodiments of the invention, the AMPS-type multipolymer comprises the reaction product of 2-acrylamido-2-methylpropanesulfonic acid, 3-allyloxy-2-hydroxy-1-propanesulfonic acid, N' N-dimethylacrylamide, acrylic acid, and acrylonitrile.
According to some embodiments of the present invention, the raw materials for preparing the AMPS-based multipolymer include the following: 100 parts by mass of water, 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid and 1 to 20 parts by mass of acrylonitrile.
According to some embodiments of the present invention, the AMPS-based multipolymer is prepared by the steps of: adding 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, and 1 to 20 parts by mass of acrylonitrile to 100 parts by mass of water, stirring to dissolve, then adjusting the pH of the solution to 6 to 7, followed by holding at 60 to 75 ℃ for 1 to 1.5 hours under an inert atmosphere; then adding an initiator under stirring, continuing to react under stirring at 60-75 ℃, and cooling to room temperature (for example, naturally cooling to 25 +/-5 ℃) to obtain the AMPS multipolymer.
According to some embodiments of the invention, the initiator comprises an oxidizing agent and a reducing agent; the amount of the oxidizing agent is 0.1 to 0.3 part by mass based on 100 parts by mass of the water; the amount of the reducing agent is 0.1 to 0.3 part by mass.
According to some embodiments of the invention, the oxidizing agent is ammonium persulfate and the reducing agent is sodium bisulfite.
According to some embodiments of the invention, the high temperature resistant stabilizer is selected from the sepiolite family of clay minerals.
In the invention, the sepiolite clay mineral refers to fibrous porous magnesian silicate mineral, and the crystal has chain and layer transition type structural characteristics and is characterized in that 1 layer of magnesian octahedron is sandwiched between 2 layers of silicon oxygen tetrahedral sheets. The high temperature resistance means that the high temperature resistance has higher thermal stability, and the crystal structure is not changed when the high temperature resistance is heated to 350 ℃.
According to some embodiments of the invention, the cross-linking agent is selected from cross-linked starch.
According to some preferred embodiments of the present invention, the cross-linked starch is starch obtained by cross-linking starch with phosphorus oxychloride, sodium trimetaphosphate, adipic acid, and hexametaphosphate as cross-linking agents and sodium hydroxide as a catalyst.
According to some embodiments of the invention, the surfactant comprises a nonionic surfactant, an anionic surfactant, an organic acid, a shear strength agent, and water.
According to some embodiments of the present invention, the surfactant comprises, in parts by weight, 2 to 10 parts by mass of a nonionic surfactant, 2 to 7 parts by mass of an anionic surfactant, 0.5 to 4 parts by mass of an organic acid, 0.5 to 4 parts by mass of a shear strength improver, and 72 to 100 parts by mass of water.
According to some embodiments of the invention, the nonionic surfactant is selected from one or more of fatty alcohol polyoxyethylene ethers.
According to some embodiments of the invention, the fatty alcohol-polyoxyethylene ether has the formula R 1 O(CH 2 CH 2 O) m H, in the formula, alkyl R 1 Preferably C 12 -C 18 Alkyl groups of (a); m is preferably from 3 to 9. According to some embodiments of the invention, the anionic surfactant is selected from one or more of alkyl alcohol polyoxyethylene ether phosphate salts.
According to some embodiments of the invention, the alkyl alcohol polyoxyethylene ether phosphate salt has the formula R 5 O(CH 2 CH 2 O) y OPO(ONa) 2 In the formula (II) in which the alkyl radical R 5 Preferably C 8 -C 12 Alkyl group of (1).
According to some embodiments of the invention, the organic acid is selected from linear alkyl benzene sulphonic acid and/or petroleum sulphonic acid.
According to some embodiments of the invention, the linear alkyl benzene sulfonic acid has the formula R 6 (C 6 H 4 )SO 3 H, in the formula, alkyl R 6 Preferably C 8 -C 16 Alkyl group of (1).
According to some embodiments of the invention, the petroleum sulfonic acid has the formula R 7 SO 3 H, in the formula, alkyl R 7 Preferably C 14 -C 18 Alkyl group of (1).
According to some embodiments of the invention, the stripping agent is selected from sakaguta.
According to some embodiments of the invention, the weighting agent is selected from one or more of calcium carbonate, barite, iron ore fines and galena fines.
According to some embodiments of the invention, the weighting agent is barite.
According to some embodiments of the invention, the barite has a sieve balance of less than 3% passing through a sieve having a pore size of 0.076 mm.
According to some embodiments of the invention, the barite powder has a densityIs 4.0 to 4.3g/cm 3 。
According to some embodiments of the invention, the dispersant is selected from one or more of an aldehyde ketone polycondensate and a sulfonate-based dispersant.
According to some embodiments of the invention, the dispersant is selected from one or more of an aldehyde ketone polycondensate.
According to some embodiments of the invention, the defoamer is selected from one or more of phosphate esters.
According to some embodiments of the invention, the defoamer is selected from tributyl phosphate.
According to a second aspect of the invention, the cementing spacer fluid comprises or is prepared from a feedstock comprising the composition of the first aspect.
According to some embodiments of the invention, the cementing spacer fluid has a density of 1.6 to 2.05g/cm 3 。
According to a third aspect of the invention, the preparation method of the well cementation spacer fluid comprises the following steps:
s1: mixing the high-temperature resistant suspending agent, the high-temperature resistant stabilizing agent, the cross-linking agent and optional dispersing agent and defoaming agent with water to obtain bulk water;
s2: mixing a surfactant with the bulk sample water obtained in the step S1 to obtain a spacer fluid base fluid;
s3: and (3) mixing the spacer fluid base fluid obtained in the step (S2) with a weighting agent to obtain the well cementation spacer fluid.
According to some embodiments of the invention, the spacer fluid base fluid obtained in step S2 is mixed with a weighting agent 4-6 hours before use.
In some preferred embodiments of the present invention, the method for preparing the spacer fluid system comprises the following steps:
1) Adding the high-temperature resistant suspending agent, the high-temperature resistant stabilizing agent, the cross-linking agent, the dispersing agent and the defoaming agent into water, and uniformly mixing to obtain large sample water;
2) Slowly adding the surfactant into the bulk sample water, and uniformly mixing (for example, uniformly mixing by continuous stirring) to obtain a spacer fluid base fluid;
3) And slowly adding the weighting agent into the spacer fluid base fluid 5 hours before the well cementation construction, uniformly mixing (for example, uniformly mixing by stirring) to obtain the spacer fluid system, and not stopping stirring before the well cementation construction.
According to some embodiments of the invention, the weighting agent of step 3) is stored in a closed container for use within 1 day prior to construction.
According to a fourth aspect of the present invention, the present invention provides the composition of the first aspect, the well cementing spacer fluid of the second aspect or the well cementing spacer fluid prepared by the method of the third aspect, for well cementing, in particular for deep and/or ultra-deep well cementing.
The spacer fluid system has the characteristic of low consumption of high-temperature resistant suspending agent, and simultaneously has the characteristic of high temperature resistance (such as 130-180 ℃), and in addition, the density of the spacer fluid system can be adjusted within the range of 1.6-2.05g/cm 3 . Has good suspension performance in the corresponding high-temperature oil and gas well cementing construction, and the difference of the upper density and the lower density of the spacer fluid which meets the requirements of the construction scheme is less than 0.05g/cm 3 . The slurry can maintain good rheological property of the slurry, and the risk of annular blockage and pump-out leakage of the stratum is low; meanwhile, the oil-based drilling fluid has a good flushing effect, and can achieve the purposes of fully cleaning the annular space and ensuring the efficient annular space sealing of the cement sheath. The construction of the large fracturing at the later stage can be smoothly carried out, and the risk of the shale gas well annulus under pressure is reduced.
According to the field construction reaction, the isolating liquid system has better cold slurry rheological property and good pumpability in the process of adding the weighting agent and stirring the slurry, and the density tested by the field construction and the density returned from the well head are consistent with the designed density, thereby meeting the requirements of the field construction.
Detailed Description
The invention will now be further illustrated by means of specific examples, but it will be understood that the scope of the invention is not limited thereto.
The present invention is further described below with reference to examples, which are intended to be illustrative only, and are not intended to limit the scope of the present invention in any way.
The raw materials used in the examples are all commercially available, and the chemical products mentioned are all common chemical products in the prior art, unless otherwise specified.
Example 1
Raw materials:
(1) High temperature resistant suspending agent: 75 parts by mass of OCMA type sodium bentonite and 25 parts by mass of AMPS (2-acrylamide-2-methylpropanesulfonic acid) multipolymer, wherein the preparation method of the AMPS multipolymer comprises the following steps:
adding 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, and 1 to 20 parts by mass of acrylonitrile to 100 parts by mass of water, stirring to dissolve, then adjusting the pH of the solution to 6 to 7, followed by holding at 60 to 75 ℃ for 1 to 1.5 hours under an inert atmosphere; then adding an initiator under the stirring state, continuously reacting under the stirring state at the temperature of between 60 and 75 ℃, and cooling to room temperature (for example, naturally cooling to 25 +/-5 ℃) to obtain the high-temperature-resistant fluid loss agent; wherein the initiator comprises an oxidizing agent and a reducing agent; the amount of the oxidizing agent is 0.1 to 0.3 part by mass based on 100 parts by mass of the water; the amount of the reducing agent is 0.1 to 0.3 part by mass; the oxidant is ammonium persulfate, and the reducing agent is sodium bisulfite.
(2) High temperature resistant stabilizer: sepiolite clay minerals available from sepiolite wool, inc.
(3) A crosslinking agent: high temperature resistant cross-linked starch, available from merosal industries, ltd.
(4) Surfactant (b): 2 to 10 parts of fatty alcohol-polyoxyethylene ether, 2 to 7 parts of alkyl alcohol-polyoxyethylene ether phosphate, 0.5 to 4 parts of linear alkyl benzene sulfonic acid or petroleum sulfonic acid, 0.5 to 4 parts of bentonite and 72 to 100 parts of water.
(5) Dispersing agent: aldehyde ketone polycondensate, dispersant DZS from continental shelf petroleum engineering technologies ltd, texas.
(6) Defoaming agent: tributyl phosphate.
(7) Weighting agent: the barite powder has a density of 4.0-4.3g/cm 3 The screen allowance of the screen with the aperture of 0.076mm is less than 3 percent.
The preparation method comprises the following steps:
(1) Adding 3 parts by mass of high-temperature resistant suspending agent, 3 parts by mass of high-temperature resistant stabilizing agent, 1 part by mass of cross-linking agent, 0.8 part by mass of dispersing agent and 1 part by mass of defoaming agent into 100 parts of water, and uniformly mixing to obtain large sample water; and adding 10 parts by mass of surfactant into the bulk sample water, and uniformly mixing to obtain the base solution of the spacer fluid, wherein the base solution can be used for construction.
(2) And adding 100 parts by mass of weighting agent into the base fluid of the spacer fluid, and fully and uniformly stirring to form the spacer fluid suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 2
Raw materials:
(1) High temperature resistant suspending agent: the same as in example 1.
(2) High temperature resistant stabilizer: the same as in example 1.
(3) A crosslinking agent: example 1.
(4) Surfactant (b): the same as in example 1.
(5) Dispersing agent: the same as in example 1.
(6) Defoaming agent: the same as in example 1.
(7) Weighting agent: the same as in example 1.
The preparation method comprises the following steps:
(1) Adding 4 parts by mass of high-temperature resistant suspending agent, 3 parts by mass of high-temperature resistant stabilizer, 2 parts by mass of cross-linking agent, 0.8 part by mass of dispersing agent and 1 part by mass of defoaming agent into 100 parts of water, and uniformly mixing to obtain large sample water; and adding 10 parts by mass of surfactant into the bulk sample water, and uniformly mixing to obtain the base solution of the spacer fluid, wherein the base solution can be used for construction.
(2) And adding 150 parts by mass of weighting agent into the base fluid of the spacer fluid, and fully and uniformly stirring to form the spacer fluid suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 3
Raw materials:
(1) High temperature resistant suspending agent: the same as in example 1.
(2) High temperature resistant stabilizer: the same as in example 1.
(3) A crosslinking agent: example 1.
(4) Surfactant (b): the same as in example 1.
(5) Dispersing agent: the same as in example 1.
(6) Defoaming agent: the same as in example 1.
(7) Weighting agent: the same as in example 1.
The preparation method comprises the following steps:
(1) Adding 5 parts by mass of high-temperature resistant suspending agent, 3 parts by mass of high-temperature resistant stabilizer, 3 parts by mass of cross-linking agent, 1 part by mass of dispersing agent and 1 part by mass of defoaming agent into 100 parts of water, and uniformly mixing to obtain large sample water; and adding 10 parts by mass of surfactant into the bulk sample water, and uniformly mixing to obtain the base solution of the spacer fluid, wherein the base solution can be used for construction.
(2) And adding 200 parts by mass of weighting agent into the base fluid of the spacer fluid, and fully and uniformly stirring to form the spacer fluid suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 4
3 parts of high-temperature resistant suspending agent and 5 parts of high-temperature resistant stabilizing agent, and the rest is the same as example 3.
The amounts of the components are shown in Table 1.
Example 5
The same procedure as in example 3 was repeated except that 13 parts by mass of a surfactant was used.
The amounts of the components are shown in Table 1.
Example 6
The procedure of example 1 was repeated except that the high-temperature resistant suspending agent was 50 parts by mass of OCMA type sodium bentonite and 50 parts by mass of AMPS multipolymer.
The amounts of the components are shown in Table 1.
Example 7
The procedure of example 1 was repeated except that the high-temperature resistant suspension concentrate was 85 parts by mass of OCMA type sodium bentonite and 15 parts by mass of AMPS multipolymer.
The amounts of the components are shown in Table 1.
Comparative example 1
The same procedure as in example 1 was repeated except that 2 parts by mass of the high temperature resistant suspending agent was used.
The amounts of the components are shown in Table 1.
Comparative example 2
The same procedure as in example 1 was repeated except that 0 part by mass of the crosslinking agent was used.
The amounts of the components are shown in Table 1.
Comparative example 3
The procedure of example 1 was repeated except that 2 parts by mass of the high-temperature stabilizer was used.
The amounts of the components are shown in Table 1.
Comparative example 4
The same procedure as in example 3 was repeated except that 6 parts by mass of the high temperature resistant suspending agent was used.
The amounts of the components are shown in Table 1.
Comparative example 5
The same as in example 1 except for 6 parts by mass of a high temperature resistant stabilizer and 0 part by mass of a high temperature resistant suspending agent.
The amounts of the components are shown in Table 1.
Comparative example 6
The procedure of example 1 was repeated except that 0 part by mass of the high temperature resistant stabilizer and 6 parts by mass of the high temperature resistant suspending agent were used.
The amounts of the components are shown in Table 1.
TABLE 1
Performance testing
The spacer fluid systems prepared in examples 1 to 7 and comparative examples 1 and 6 were subjected to performance tests, and specific performance results are shown in table 2.
TABLE 2 high temperature resistant insulating fluid system Performance
As can be seen from table 2, the shear stress readings of the spacer fluids in examples 1 to 3 are good, and the good stability at normal temperature indicates that the spacer fluid system corresponding to each density has good fluidity and good suspension property at normal temperature, the density of the slurry at normal temperature is uniform, and the slurry has the conditions of safe pumping in site construction; the slurry sedimentation density difference after high-temperature condition maintenance meets the well cementation construction requirement, and the result shows that under the underground high-temperature condition, a spacer fluid system can still keep better slurry fluidity, the suspension property and the stability of the slurry are better kept, in the whole construction process, the slurry can not have serious heavy material sedimentation risk, can not block an annular space, can not hold a pump, can ensure the smooth proceeding of the whole construction process, the flushing and oil displacement efficiency of spacer fluids with three densities on oil-based drilling fluid can reach more than 96 percent, and the result shows that the annular space can be effectively flushed under each density, the effective cementation of a well cementation cement ring, a stratum and a sleeve is ensured, and the success of well cementation construction is promoted.
Comparative examples 1 to 3 are respectively added with 1 part by mass of less high-temperature resistant suspending agent, less high-temperature resistant stabilizing agent and less cross-linking agent compared with example 1, the normal-temperature rheological property and the oil displacement efficiency of the slurry meet the requirements of well cementation construction, but the density difference of the upper part and the lower part of the slurry under the high-temperature curing condition is more than 0.05g/cm 3 Under the condition of high temperature in the well, the risk of serious sedimentation of slurry is high, which may cause the phenomena of pump holding and stratum leaking, and the smooth operation of well cementation construction cannot be ensured.
Compared with the embodiment 3, the high-temperature resistant suspending agent is added by 1 part by mass, so that the slurry has larger fluidity tail number under the curing condition of 93 ℃ and poor slurry fluidity, and the normal-temperature stability meets the requirement, but the slurry is obviously thickened under the high-temperature curing condition, the rheological parameter cannot be measured, the slurry has poor fluidity under the high-temperature environment, the pump pressure is high, and the requirement of well cementation construction is also not met.
In example 4, compared with example 3, the high temperature resistant suspending agent is added by 2 parts by mass less, the high temperature resistant stabilizing agent is added by 2 parts by mass more, and the normal temperature rheological property, the normal temperature stability and the high temperature stability of the isolation liquid slurry body all meet the requirements of well cementation construction. The high-temperature resistant suspending agent and the high-temperature resistant stabilizing agent play a crucial role in a spacer fluid system, and the defects are all obvious. The performance of the isolated liquid system can be optimized by refining the addition amount.
Compared with the embodiment 3, the embodiment 5 has the advantages that the addition of the flushing liquid is increased by 3 parts by mass, the oil displacement effect is improved, the oil displacement effect is over 99 percent, and the oil displacement effect is excellent. The minimum flushing liquid dosage of the spacer fluid system is 10%, and the dosage of the flushing liquid can be flexibly adjusted according to different oil-based drilling fluid performances of different wells.
The high-temperature resistant suspending agent in the embodiment 6 is prepared by compounding 50 parts by mass of OCMA type sodium bentonite and 50 parts by mass of AMPS multipolymer, the compounding proportion of the original embodiment 1 is changed from 3 to 1, and correspondingly, the addition of the sodium bentonite is obviously reduced, an isolation liquid system is obviously thinned at normal temperature, and has poor settling stability at normal temperature, and the requirements of field construction are not met.
The high-temperature resistant suspending agent in the embodiment 7 is prepared by compounding 85 parts by mass of OCMA type sodium bentonite and 15 parts by mass of AMPS multipolymer, the compounding proportion of the original embodiment 1 is changed from 3 to 1 to about 5.7, and the normal-temperature slurry fluidity of the spacer fluid system is deteriorated but the construction requirement is still met; however, the density difference of the upper part and the lower part of the pulp is more than 0.05g/cm under the high-temperature curing condition 3 Under the high temperature condition in the pit, the risk of serious sedimentation of slurry is higher, which may cause the phenomena of pump holding and stratum leaking, and the smooth proceeding of well cementation construction cannot be ensured.
According to the experimental results of the embodiments 1, 6 and 7, the optimized compounding ratio of the OCMA type sodium bentonite to the AMPS multipolymer in the high-temperature resistant suspending agent is (2-4): 1.
Comparative examples 5 and 6 are the case where only the high temperature resistant suspending agent or the high temperature resistant stabilizer is added under the condition that the total amount of the high temperature resistant suspending agent and the high temperature resistant stabilizer is not changed. Compared with the example 1, the sedimentation stability of the spacer fluid system under high-temperature curing tends to be poor, which shows that the high-temperature resistant suspending agent and the high-temperature resistant stabilizing agent are key auxiliary agents in the formation of the spacer fluid system, and have a synergistic effect and are not indispensable.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not set any limit to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (9)
1. A well cementation spacer fluid comprises a high temperature resistant suspending agent, a high temperature resistant stabilizing agent, cross-linked starch, a surfactant, a weighting agent and water,
wherein, based on the mass of water, the content of the high-temperature resistant suspending agent is 3-5%, the content of the high-temperature resistant stabilizing agent is 3-5%, the content of the cross-linked starch is 1-3%, the content of the surfactant is 10-13%, and the content of the weighting agent is 100-200%;
the well cementation spacer fluid also comprises a dispersant and a defoaming agent, wherein the content of the dispersant is 1-1.5% by mass of water; the content of the defoaming agent is 1-2%; the dispersant is selected from aldehyde ketone polycondensates;
the high-temperature resistant suspending agent comprises bentonite and an AMPS multipolymer, wherein the mass ratio of the bentonite to the AMPS multipolymer is (2-4): 1, the bentonite is selected from sodium bentonite, and the AMPS multipolymer comprises a reaction product of 2-acrylamide-2-methyl propane sulfonic acid, 3-allyloxy-2-hydroxy-1-propane sulfonic acid, N' N-dimethylacrylamide, acrylic acid and acrylonitrile;
the high temperature resistant stabilizer is selected from sepiolite clay minerals;
the surfactant comprises 2 to 10 parts by weight of nonionic surfactant, 2 to 7 parts by weight of anionic surfactant, 0.5 to 4 parts by weight of organic acid, 0.5 to 4 parts by weight of shear strength improver and 72 to 100 parts by weight of water; the nonionic surfactant is selected from one or more of fatty alcohol-polyoxyethylene ether, the anionic surfactant is selected from one or more of alkyl alcohol-polyoxyethylene ether phosphate ester salts, the organic acid is selected from linear alkyl benzene sulfonic acid and/or petroleum sulfonic acid, and the stripping agent is selected from bentonite.
2. The cementing spacer fluid of claim 1, wherein the weighting agent is selected from one or more of calcium carbonate, barite, iron ore fines, and galena fines.
3. The cementing spacer fluid of claim 2, wherein the barite has less than 3% of its screen residue passing through a 0.076mm mesh.
4. The cementing spacer fluid of claim 1 or 2, wherein the defoamer is selected from tributyl phosphate.
5. The cementing spacer fluid of claim 1 or 2, wherein the cementing spacer fluid has a density of 1.6-2.05g/cm 3 。
6. A method of preparing the cementing spacer fluid of any one of claims 1 to 5, comprising the steps of:
s1: mixing the high-temperature resistant suspending agent, the high-temperature resistant stabilizing agent, the cross-linked starch, the dispersing agent and the defoaming agent with water to obtain bulk water;
s2: mixing a surfactant with the bulk sample water obtained in the step S1 to obtain a spacer fluid base fluid;
s3: and (3) mixing the spacer fluid base fluid obtained in the step (S2) with a weighting agent to obtain the well cementation spacer fluid.
7. The preparation method according to claim 6, wherein the spacer fluid base fluid obtained in step S2 is mixed with a weighting agent 4-6 hours before use.
8. Use of a cementing spacer fluid according to any one of claims 1 to 5 or prepared according to the preparation process of claim 6 or 7 in cementing wells.
9. Use according to claim 8, wherein the use is in deep and/or ultra deep well cementing.
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Citations (3)
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| US5030366A (en) * | 1989-11-27 | 1991-07-09 | Atlantic Richfield Company | Spacer fluids |
| US5447197A (en) * | 1994-01-25 | 1995-09-05 | Bj Services Company | Storable liquid cementitious slurries for cementing oil and gas wells |
| 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 |
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| US20120090848A1 (en) * | 2010-10-19 | 2012-04-19 | Halliburton Energy Services, Inc. | Modification of solid polysaccharide with transesterification agent |
| CN103965845B (en) * | 2013-02-05 | 2017-04-12 | 中国石油化工股份有限公司 | Flushing fluid for cementing of horizontal shale gas well |
| CN103555304B (en) * | 2013-11-08 | 2016-06-08 | 沈阳工业大学 | A kind of oil base flushing spacer fluid and preparation method thereof |
| CN111018410B (en) * | 2018-10-09 | 2022-06-03 | 中国石油化工股份有限公司 | Cement paste system and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5030366A (en) * | 1989-11-27 | 1991-07-09 | Atlantic Richfield Company | Spacer fluids |
| US5447197A (en) * | 1994-01-25 | 1995-09-05 | Bj Services Company | Storable liquid cementitious slurries for cementing oil and gas wells |
| 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 |
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