CN113060993A - Drag reduction material for fine pressure control well cementation and drag reduction cement slurry - Google Patents
Drag reduction material for fine pressure control well cementation and drag reduction cement slurry Download PDFInfo
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- CN113060993A CN113060993A CN202110387102.3A CN202110387102A CN113060993A CN 113060993 A CN113060993 A CN 113060993A CN 202110387102 A CN202110387102 A CN 202110387102A CN 113060993 A CN113060993 A CN 113060993A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/28—Friction or drag reducing additives
Abstract
The invention discloses a drag reduction material for fine pressure control well cementation and drag reduction cement slurry. The drag reduction material for pressure control well cementation consists of a drag reducer, drag reduction particles, a polymer active agent, sodium sulfamate and phosphate. The cement and the anti-drag material for pressure-controlled well cementation can be used for preparing the anti-drag cement for pressure-controlled well cementation, and the mass of the anti-drag material for pressure-controlled well cementation is 10-18% of that of the cement. The anti-drag cement slurry for pressure-controlled well cementation can be prepared from at least one of anti-drag cement for pressure-controlled well cementation, water, a fluid loss additive, a retarder, a defoaming agent, a suspension stabilizer and a weighting agent. The anti-drag cement slurry for pressure-control well cementation has the characteristics of good rheological property, low friction resistance, low filtration loss, arbitrarily adjustable thickening time, stable thickening performance, simple formula composition and field construction and the like, and can meet the technical requirements of pressure-control well cementation and cement injection.
Description
Technical Field
The invention relates to a drag reduction material for fine pressure control well cementation and drag reduction cement slurry, and belongs to the technical field of petroleum engineering.
Background
As the exploration and development of oil and gas resources gradually move to deep water and deep layers, the problem of narrow-density window stratum well cementation is increasingly prominent. Because the operation density window is narrow, the pressure balance in the whole process of well cementation is difficult to realize, and overflow and leakage phenomena are easy to occur, so that the well cementation operation fails.
The fine pressure control well cementation technology can effectively solve the problem of safe well cementation of strata with a narrow density window, and the technology requires that the well entering fluid has low annular friction resistance in the pressure control well cementation process, so that accurate control of pressure control in a cement injection displacement stage is ensured, and the pressures of an overflow section and a leakage section are controlled within the range of the safe density window. The selection of a low annular friction cement slurry system is the key for ensuring the success of pressure control cementing, and the conventional cement slurry system has large annular friction of the cement slurry and small wellhead back pressure compensation space due to the fact that no special resistance reducing material is added, so that the fine pressure control at the stage of cement slurry injection cannot be realized.
At present, the anti-drag material and low-friction cement slurry system suitable for fine pressure control well cementation are few, are still in the initial development and exploration stage, and have great research value and application prospect in pressure control well cementation. Therefore, the research on the anti-drag material and the low-friction cement slurry system suitable for the fine pressure control well cementation operation is vital, the circulating pressure loss and the construction operation time in the pressure control well cementation construction process can be reduced, the construction pressure and the safety risk are reduced, and the sealing quality of the stratum with the narrow pressure window is ensured.
Disclosure of Invention
The invention aims to provide the anti-drag material for the fine pressure control well cementation, the anti-drag material has simple preparation process and low cost, the effect of reducing annular friction after being added into cement slurry is good, and the formed cement slurry can be used for the narrow-density window pressure control well cementation operation, so that the accurate control of the pressure control pressure in the cement slurry displacement stage is ensured, and the well cementation quality is improved.
The drag reduction material for pressure control well cementation provided by the invention consists of drag reducer, drag reduction particles, polymer activator, sodium sulfamate and phosphate;
the content of each component in each 100 parts by mass of the alkali-resistant material is as follows:
9-12 parts by mass of an alkali resistance agent;
30-40 parts by mass of anti-drag particles;
40-50 parts by mass of a polymer activator;
9-12 parts by mass of sodium sulfamate;
2-5 parts by mass of phosphate.
The content of each component in each 100 parts by mass of the alkali-resistant material is preferably as follows:
1) 9 parts of an alkali resistance agent; 30-40 parts by mass of anti-drag particles; 40-50 parts by mass of a polymer activator; 9-12 parts by mass of sodium sulfamate; 2-5 parts by mass of phosphate ester;
2) 9 parts of an alkali resistance agent; 30-35 parts by mass of anti-drag particles; 40-44 parts by mass of a polymer active agent; 9-10 parts by mass of sodium sulfamate; 2-3 parts by mass of phosphate ester;
3) 9 parts of an alkali resistance agent; 35 parts of drag reduction particles; 44 parts by mass of a polymer active agent; 9 parts of sodium sulfamate; 3 parts of phosphate.
In the drag reduction material, the drag reduction particles are spherical solid particles with the mesh number of 400-800 meshes, the material is metal oxide, and the metal oxide is alumina, silicon dioxide and/or trimanganese tetroxide.
The anti-drag particles comprise low-mesh spherical solid particles and high-mesh spherical solid particles;
the mass ratio of the low-mesh spherical solid particles to the high-mesh spherical solid particles is 1: 2-3, preferably 1: 2.5, the mesh number of the low-mesh spherical solid particles is preferably 400 meshes, and the mesh number of the high-mesh spherical solid particles is preferably 800 meshes.
In the drag reducing material, the drag reducing agent can be at least one of formaldehyde acetone polycondensate, polynaphthalene sulfonate, lignosulfonate and polyhydroxy carboxylate;
the formaldehyde acetone condensation polymer may be a sulfonated ketone aldehyde condensation polymer, such as the one available under the trade designation CF44S from oil science and technology, Inc., of Jianghan, Hubei.
The polynaphthalene sulfonate can be a naphthalene sulfonate formaldehyde condensate;
the polyhydroxy carboxylate can be citric acid, tartaric acid, salicylic acid and the like and salts thereof;
the polymeric active agent may be a vinyl monomer polymer or a derivative thereof, such as an ethylene-vinyl acetate copolymer or a derivative thereof;
the phosphate can be alkyl polyoxyethylene ether phosphate and alkyl phosphate, such as dodecyl phosphate triethanolamine.
On the basis of the anti-drag material, the invention further provides anti-drag cement for pressure control well cementation, which is obtained by uniformly mixing the anti-drag material with the cement;
the weight of the pressure control well cementation drag reduction material is 10-18% of that of the cement, such as 10%, 12%, 15%, 17% or 18%;
the cement is preferably G-grade oil well cement, belongs to Portland silicate oil well cement, mainly comprises tricalcium aluminate, tetracalcium aluminoferrite, tricalcium silicate and dicalcium silicate in chemical components, and requires the specific surface area not less than 300m2The grain size is 10 um-30 um per kg, and the screen residue of 45um sieve pores is not more than 5%.
The pressure-control well cementation drag-reduction cement has low friction resistance and high performance, reduces the annular friction resistance by 45-50%, and has a good drag-reduction effect.
On the basis of the anti-drag cement, the invention further provides anti-drag cement slurry for pressure-controlled well cementation, which is obtained by uniformly mixing the anti-drag cement for pressure-controlled well cementation with at least one of water and a fluid loss agent, a retarder, a defoaming agent, a suspension stabilizer and a weighting agent;
the contents of the components are as follows relative to 100 parts by mass of the cement:
3-6 parts of a fluid loss agent; 0.3-1.5 parts of retarder; 0.2-1.5 parts of a defoaming agent; 0.5-5 parts of a suspension stabilizer; 0-130 parts of weighting agent and 42-65 parts of water;
further preferred is the following
1) 3-6 parts of a fluid loss agent; 0.3-0.5 part of retarder; 0.6-1.5 parts of a defoaming agent; 1.2-2 parts of a suspension stabilizer; 20-120 parts of weighting agent and 46-64 parts of water;
2) 3 parts of a fluid loss agent; 0.5 part of retarder; 0.6 part of defoaming agent; 1.5 parts of a suspension stabilizer; 46 parts of water;
3) 3 parts of a fluid loss agent; 0.4 part of retarder; 0.6 part of defoaming agent; 2 parts of a suspension stabilizer; 20 parts of weighting agent and 46 parts of water;
4) 6 parts of a fluid loss agent; 0.3 part of retarder; 0.6 part of defoaming agent; 2 parts of a suspension stabilizer; 50 parts of weighting agent and 52 parts of water;
5) 6 parts of a fluid loss agent; 0.5 part of retarder; 0.8 part of defoaming agent; 2 parts of a suspension stabilizer; 82 parts of weighting agent and 58 parts of water;
6) 6 parts of a fluid loss agent; 0.3 part of retarder; 1.5 parts of a defoaming agent; 1.2 parts of a suspension stabilizer; weighting agent 120 parts water 64 parts.
The density of the anti-drag cement slurry for pressure control well cementation is 1.88g/cm3～1.92g/cm3；
The defoaming agent is at least one of polyvinyl ether, tributyl phosphate and organic silicon;
the fluid loss agent is selected from polymer fluid loss agents containing AMPS monomers, such as the fluid loss agent with the product code of CG88L of Jianghan oil science and technology Limited in Hubei province;
the retarder is sodium gluconate and/or AM/AA/AMPS terpolymer;
the weighting agent is micro manganese powder;
the suspension stabilizer is a mixture of silica fume and xanthan gum, and the mass ratio is 90-95: 5-10, preferably 95: 5.
compared with the prior art, the anti-drag cement slurry for pressure control well cementation has the following advantages:
(1) the annular friction of the cement paste is reduced by 45-50%, compared with the conventional cement paste system, the rheological property of the cement paste is obviously improved, the pump injection circulating pressure loss is effectively reduced, and the safety of pressure control well cementation operation is ensured;
(2) the cement paste has good sedimentation stability, and the middle sedimentation is realized in the long-time displacement process, so that the quality is ensured;
(3) the thickening time can be adjusted within 120-400 min, and the repeatability of the thickening time is high;
(4) the gas channeling prevention performance is good, the SPN index is 1.96, and the construction safety of the gas channeling prevention and well cementation in a narrow density window is met.
The anti-drag cement slurry for pressure-control well cementation has the characteristics of good rheological property, low friction resistance, low filtration loss, arbitrarily adjustable thickening time, stable thickening performance, simple formula composition and field construction and the like, and can meet the technical requirements of pressure-control well cementation and cement injection.
Drawings
Fig. 1 is a 100 ℃ thickening curve (initial consistency 13Bc/T.T ═ 145min) for a cement slurry of comparative example 1 (conventional cement slurry).
FIG. 2 is a 100 ℃ thickening curve (initial consistency 8Bc/T.T ═ 165min) for the grout of example 1 (low friction, high performance grout).
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The raw materials used in the following examples are all common products for offshore well cementing of medium-sea oil and can be purchased.
The cement slurries in the following examples were prepared according to the method described in the fifth section of "oil well cement test methods" in "GB/T19139-2012 (" preparation of the cement slurries ").
The sulfonated ketone-aldehyde polycondensate used in the examples described below was a product of CF44L available from Petroleum technologies, Inc. of Jianghan, North Hubei.
The fluid loss additive used in the examples described below was a product obtained from petroleum technologies ltd of Jianghan, Hubei under the trade designation CG 88L.
Examples 1,
The embodiment is a pressure-control well cementation drag-reduction cement slurry system (1.90 g/cm)3) The composition of (part by mass):
100 parts of G-grade oil well cement; 46 parts of fresh water; 10 parts of a drag reducing material; 1.5 parts of a suspension stabilizer; 3 parts of a fluid loss agent; 0.5 part of retarder; 0.6 part of defoaming agent.
The drag reduction material consists of drag reducers, drag reduction particles, polymer active agents, sodium sulfamate and phosphate, and the content of each component in 10 parts of the drag reduction material is as follows: 0.9 part of alkali resistance agent, 3.5 parts of drag reduction particles, 4.4 parts of polymer activator, 0.9 part of sodium sulfamate and 0.3 part of phosphate;
wherein the drag reducer is sulfonated ketone-aldehyde polycondensate, the drag reduction particles are spherical manganous-manganic oxide and consist of spherical solid particles with 400 meshes (low meshes) and spherical solid particles with 800 meshes (high meshes), and the mass ratio of the spherical solid particles to the spherical solid particles is 1: 2.5; the polymer activator is ethylene-vinyl acetate copolymer, and the phosphate ester is monododecyl phosphate triethanolamine.
In the cement slurry, a suspension stabilizer is a mixture of silica fume and xanthan gum (the mass ratio of the silica fume to the xanthan gum is 95:5), a fluid loss agent is a polymer fluid loss agent containing AMPS monomers, a retarder is an AM/AA/AMPS terpolymer, and a defoaming agent is a modified organic silicon defoaming agent.
Comparative examples 1,
The formulation of the cement slurry was substantially the same as in example 1, except that the drag reducing material was not included.
The following tests were performed on the slurries of example 1 and comparative example 1:
1. the grouts of example 1 and comparative example 1 were subjected to system performance tests, respectively, and the results are shown in table 1, fig. 1 and fig. 2.
TABLE 1 comparison of System Properties
As can be seen from Table 1 and FIGS. 1-2, the grout of example 1 has superior properties in settling stability, initial consistency, thickening transition time, fluid loss and compressive strength to the grout of comparative example 1.
2. The slurries of example 1 and comparative example 1 were subjected to rheological property tests, respectively, to obtain the results shown in table 2.
TABLE 2 comparison of rheological Properties
As can be seen from Table 2, the rheological properties of the cement slurry in example 1 are significantly reduced compared with those of comparative example 1, and the reading of phi 300 of the cement slurry is only half of that of comparative example 1, so that the viscosity of the cement slurry is greatly reduced.
3. Simulation test of annular friction resistance of cement slurries of example 1 and comparative example 1
TABLE 3CEM software simulation 9-5/8' casing annular friction calculation results
Remarking: in the case of the Ledong gas field simulated well 1 as an example 9-5/8' with 30% of casing and open hole, the cement slurry returns 1000 meters in height.
CEM software simulation 9-5/8' casing annulus friction calculation results show that: as shown in Table 3, compared with the field use of the comparative example 1 (conventional cement slurry formula), the annular friction resistance of the use example 1 (drag-reduction cement slurry system) is reduced by 1.18MPa and 22.8 percent, which is beneficial to reducing the ECD at the well bottom and ensuring the safe operation of pressure-control cementing operation.
6. Simulation test two for annular friction resistance of example 1 and comparative example 1
Table 4CEM software simulation 7 "casing annulus friction calculation:
remarking: take Ledong gas field simulation well 2 as example 7 "the open hole of the liner is added with 20%, and the cement slurry returns to 1000 meters in height.
CEM software simulation 7' tail pipe annulus friction calculation results show that: as shown in Table 4, compared with the field use of the comparative example 1 (conventional cement slurry formula), the annular friction resistance of the use example 1 (drag-reduction cement slurry system) is reduced by 1.69MPa, and the annular friction resistance reduction rate reaches 39.1%, so that the reduction of the ECD at the well bottom is facilitated, and the safe operation of pressure-control cementing operation is ensured.
Examples 2,
The embodiment of the invention relates to a drag-reduction cement slurry system for pressure control well cementation (2.00 g/cm)3) The composition of (A) is as follows:
100 parts of G-grade oil well cement; 46 parts of fresh water; 20 parts of weighting agent; 12 parts of a drag reducing material; 2 parts of a suspension stabilizer; 3 parts of a fluid loss agent; 0.4 part of retarder; 0.6 part of defoaming agent.
The drag reduction material consists of drag reducers, drag reduction particles, polymer active agents, sodium sulfamate and phosphate, and the content of each component in 12 parts of the drag reduction material is as follows: 1.08 parts of alkali resistance agent, 4.2 parts of drag reduction particles, 5.28 parts of polymer activator, 1.08 parts of sodium sulfamate and 0.36 part of phosphate;
wherein the drag reducer is sulfonated ketone-aldehyde polycondensate, the drag reduction particles are spherical manganous-manganic oxide and consist of spherical solid particles with 400 meshes (low meshes) and spherical solid particles with 800 meshes (high meshes), and the mass ratio of the spherical solid particles to the spherical solid particles is 1: 2.5; the polymer activator is ethylene-vinyl acetate copolymer, and the phosphate ester is monododecyl phosphate triethanolamine.
In the cement slurry, a suspension stabilizer is a mixture of silica fume and xanthan gum (the mass ratio of the silica fume to the xanthan gum is 95:5), a fluid loss agent is a polymer fluid loss agent containing AMPS monomers, a retarder is an AM/AA/AMPS terpolymer, and a defoaming agent is a modified organic silicon defoaming agent.
Examples 3,
The embodiment is a pressure-control well cementation drag-reduction cement slurry system (2.1 g/cm)3) The composition of (A) is as follows:
100 parts of G-grade oil well cement; 52 parts of fresh water; 50 parts of a weighting material; 15 parts of a drag reducing material; 2 parts of a suspension stabilizer; 6 parts of a fluid loss agent; 0.3 part of retarder; 0.6 part of defoaming agent.
The drag reduction material consists of drag reducers, drag reduction particles, polymer active agents, sodium sulfamate and phosphate, and the content of each component in 15 parts of the drag reduction material is as follows: 1.35 parts of alkali resistance agent, 5.25 parts of drag reduction particles, 6.6 parts of polymer active agent, 1.35 parts of sodium sulfamate and 0.45 part of phosphate;
wherein the drag reducer is sulfonated ketone-aldehyde polycondensate, the drag reduction particles are spherical manganous-manganic oxide and consist of spherical solid particles with 400 meshes (low meshes) and spherical solid particles with 800 meshes (high meshes), and the mass ratio of the spherical solid particles to the spherical solid particles is 1: 2.5; the polymer activator is ethylene-vinyl acetate copolymer, and the phosphate ester is monododecyl phosphate triethanolamine.
In the cement slurry, a suspension stabilizer is a mixture of silica fume and xanthan gum (the mass ratio of the silica fume to the xanthan gum is 95:5), a fluid loss agent is a polymer fluid loss agent containing AMPS monomers, a retarder is an AM/AA/AMPS terpolymer, and a defoaming agent is a modified organic silicon defoaming agent.
Examples 4,
The embodiment is a pressure-control well cementation drag-reduction cement slurry system (2.2 g/cm)3) The composition of (A) is as follows:
100 parts of G-grade oil well cement; 58 parts of fresh water; 82 parts of a weighting material; 17 parts of a drag reducing material; 2 parts of a suspension stabilizer; 6 parts of a fluid loss agent; 0.5 part of retarder; 0.8 part of defoaming agent.
The drag reduction material consists of drag reducers, drag reduction particles, polymer active agents, sodium sulfamate and phosphate, and the content of each component in 17 parts of the drag reduction material is as follows: 1.53 parts of alkali resistance agent, 5.95 parts of drag reduction particles, 7.48 parts of polymer activator, 1.53 parts of sodium sulfamate and 0.51 part of phosphate;
wherein the drag reducer is sulfonated ketone-aldehyde polycondensate, the drag reduction particles are spherical manganous-manganic oxide and consist of spherical solid particles with 400 meshes (low meshes) and spherical solid particles with 800 meshes (high meshes), and the mass ratio of the spherical solid particles to the spherical solid particles is 1: 2.5; the polymer activator is ethylene-vinyl acetate copolymer, and the phosphate ester is monododecyl phosphate triethanolamine.
In the cement slurry, a suspension stabilizer is a mixture of silica fume and xanthan gum (the mass ratio of the silica fume to the xanthan gum is 95:5), a fluid loss agent is a polymer fluid loss agent containing AMPS monomers, a retarder is an AM/AA/AMPS terpolymer, and a defoaming agent is a modified organic silicon defoaming agent.
Examples 5,
The embodiment is a pressure-control well cementation drag-reduction cement slurry system (2.30 g/cm)3) The composition of (A) is as follows:
100 parts of G-grade oil well cement; 64 parts of fresh water; 120 parts of a weighting material; 18 parts of a drag reducing material; 1.2 parts of a suspension stabilizer; 6 parts of a fluid loss agent; 0.3 part of retarder; 1.5 parts of a defoaming agent.
The drag reduction material consists of drag reducers, drag reduction particles, polymer active agents, sodium sulfamate and phosphate, and the content of each component in 18 parts of the drag reduction material is as follows: 1.62 parts of alkali resistance agent, 6.3 parts of drag reduction particles, 7.92 parts of polymer activator, 1.62 parts of sodium sulfamate and 0.54 part of phosphate;
wherein the drag reducer is sulfonated ketone-aldehyde polycondensate, the drag reduction particles are spherical manganous-manganic oxide and consist of spherical solid particles with 400 meshes (low meshes) and spherical solid particles with 800 meshes (high meshes), and the mass ratio of the spherical solid particles to the spherical solid particles is 1: 2.5; the polymer activator is ethylene-vinyl acetate copolymer, and the phosphate ester is monododecyl phosphate triethanolamine.
In the cement slurry, a suspension stabilizer is a mixture of silica fume and xanthan gum (the mass ratio of the silica fume to the xanthan gum is 95:5), a fluid loss agent is a polymer fluid loss agent containing AMPS monomers, a retarder is an AM/AA/AMPS terpolymer, and a defoaming agent is a modified organic silicon defoaming agent.
TABLE 5 Properties of the grouts of the examples
TABLE 6 reduction in friction in 9-5/8' casing annulus for each example cement versus comparative example 1 cement
Remarking: the data are obtained by calculating the friction resistance of the 9-5/8' casing annulus by using CEM software
As can be seen from Table 6, the annular friction resistances of the samples 1-5 (drag-reduction cement paste system) are respectively reduced by 1.18MPa, 1.10MPa, 1.38MPa, 1.17MPa and 1.27MPa compared with the field sample 1 (conventional cement paste formula), and the drag reduction percentages are respectively 22.8%, 21.3%, 26.7%, 22.7% and 24.6%, which is beneficial to reducing the ECD at the well bottom and ensuring the safe operation of pressure-control well cementation.
TABLE 7 reduction of friction resistance of grout in 7' casing annulus for each example versus grout of comparative example 1
As can be seen from Table 7, the annular friction resistances of the samples 1-5 (drag-reduction cement paste system) are respectively reduced by 1.69MPa, 1.75MPa, 1.55MPa, 1.60MPa and 1.73MPa compared with the field sample 1 (conventional cement paste formula), and the drag reduction percentages are respectively 39.1%, 38.0%, 41.4%, 37.0% and 40.0%, which is beneficial to reducing the ECD at the well bottom and ensuring the safe operation of pressure-control well cementation.
Therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A drag-reducing material for pressure-controlling well cementation is composed of drag reducer, drag-reducing particles, polymer activator, sodium sulfamate and phosphate.
2. The drag reducing material of claim 1 wherein: the content of each component in each 100 parts by mass of the alkali-resistant material is as follows:
9-12 parts by mass of an alkali resistance agent;
30-40 parts by mass of anti-drag particles;
40-50 parts by mass of a polymer activator;
9-12 parts by mass of sodium sulfamate;
2-5 parts by mass of phosphate.
3. The drag reducing material of claim 1 or 2 wherein: the anti-drag particles are spherical solid particles with the mesh number of 400-800 meshes, the material is metal oxide, and the metal oxide is alumina, silicon dioxide and/or mangano-manganic oxide.
4. The drag reducing material of claim 3 wherein: the anti-drag particles comprise low-mesh spherical solid particles and high-mesh spherical solid particles, and the number ratio of the low-mesh spherical solid particles to the high-mesh spherical solid particles is 1: 2.5.
5. the drag reducing material of any of claims 1-4 wherein: the drag reducer is at least one of formaldehyde acetone polycondensate, polynaphthalene sulfonate, lignosulfonate and polyhydroxy carboxylate;
the polymer activator is vinyl monomer polymer and derivatives thereof;
the phosphate ester is alkyl polyoxyethylene ether phosphate ester salt and alkyl phosphate ester salt.
6. A drag-reducing cement for pressure-controlling well cementation, which consists of cement and a drag-reducing material for pressure-controlling well cementation as claimed in any one of claims 1 to 5;
the weight of the pressure control well cementation drag reduction material is 10-18% of that of the cement.
7. The drag-reducing cement for pressure-controlled well cementation according to claim 6, characterized in that: the cement is G-grade oil well cement.
8. A drag-reducing cement slurry for pressure-controlling well cementation, which consists of the drag-reducing cement for pressure-controlling well cementation, water and at least one of a fluid loss agent, a retarder, a defoaming agent, a suspension stabilizer and a weighting agent in claim 6 or 7;
the contents of the components are as follows relative to 100 parts by mass of the cement:
3-6 parts of a fluid loss agent; 0.3-1.5 parts of retarder; 0.2-0.5 part of defoaming agent; 0.5-5 parts of a suspension stabilizer; 0-130 parts of weighting agent and 42-46 parts of water.
9. The drag-reducing cement slurry for pressure-controlling well cementation according to claim 8, characterized in that: the density of the anti-drag cement slurry for pressure control well cementation is 1.88g/cm3～1.92g/cm3；
The defoaming agent is at least one of polyvinyl ether, tributyl phosphate and organic silicon;
the fluid loss agent is selected from polymer fluid loss agents containing AMPS monomers;
the retarder is sodium gluconate and/or AM/AA/AMPS terpolymer;
the weighting agent is micro manganese powder;
the suspension stabilizer is a mixture of active silica fume and xanthan gum.
10. The use of the drag-reducing cement slurry for pressure-controlled well cementation according to claim 8 or 9 in narrow density window pressure-controlled well cementation operations;
the anti-drag cement slurry for pressure control well cementation can reduce annular friction resistance.
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| CN113800832A (en) * | 2021-09-17 | 2021-12-17 | 中国石油集团工程技术研究院有限公司 | Low-friction high-density cement paste and preparation method thereof |
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