CN110668765B - Negative-temperature well cementation cement slurry in frozen soil area and preparation method and application thereof - Google Patents
Negative-temperature well cementation cement slurry in frozen soil area and preparation method and application thereof Download PDFInfo
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- 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
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Abstract
The invention relates to a negative temperature well cementation cement paste in a frozen soil area and a preparation method and application thereof, belonging to the technical field of oil field well cementation; the negative temperature well cementation cement slurry for the frozen soil area comprises the following components in parts by weight: 100 parts of modified aluminate cement, 6-15 parts of negative temperature antifreezing early strength agent, 0.05-3 parts of alcohol-ammonia coagulant, 40-44 parts of water, 0-5 parts of light metal expanding agent and 0-6 parts of nonionic polymer fluid loss agent; the cement slurry for negative temperature well cementation in the frozen soil area has good rheological property, can be cured within 3 hours at the temperature of-18 ℃, has the 24-hour compressive strength of up to 6MPa, effectively solves the problems that the conventional cement slurry is not cured and has no strength due to liquid phase segregation freezing, the well cementation quality in the low temperature frozen soil area is poor, and even the well cementation operation can not be carried out completely in the negative temperature environment, and meets the well cementation construction requirements of the frozen soil area.
Description
Technical Field
The invention relates to the technical field of oil field well cementation, in particular to negative temperature well cementation cement slurry in a frozen soil area and a preparation method and application thereof.
Background
The polar cold sea area has important strategic value of oil and gas exploration and development, but the areas are mostly in frozen soil areas, the exploration and development conditions are very harsh, and a plurality of challenges are faced, wherein the biggest problem is that the surface stratum temperature is extremely low. The important oil and gas reservoirs in polar regions are mostly distributed in permafrost regions, the temperature is-5 to-8 ℃, the content of formation ice reaches 80 percent, and the depth reaches 500m. The strength development of the conventional well cementation cement slurry system is very slow under the low temperature condition, when the environmental temperature is lower than 20 ℃, the induction period of the cement is prolonged, and the hydration of the cement is slow; when the environmental temperature is lower than 0 ℃, the water in the cement slurry is subjected to segregation and freezing, even completely does not participate in the cement hydration reaction, so that the cement slurry is not solidified and has no strength, and the requirement of well cementation is difficult to meet.
At present, the types of well cementation cement slurry used in low temperature environment are few. Chinese patent with publication No. CN106634899A provides a liquid colloid-filled low-temperature well cementation cement slurry system, which discloses a low-temperature cement slurry comprising 100 parts of portland cement, 80-120 parts of superfine portland cement, 10-30 parts of hollow glass beads, 10-20 parts of micro-silicon, 8-12 parts of liquid colloid, 2-6 parts of an early strength agent, 1-2 parts of a drag reducer, 4-8 parts of a fluid loss agent, 1-2 parts of a defoaming agent and 120-150 parts of water. The density of the cement paste is 1.35 to 1.65g/cm 3 The cement has the advantages of adjustability, high low-temperature early strength, good thickening performance and flow performance and small water loss, and can be used for deep water surface layer interval well cementation at about 15 ℃.
Chinese patent with publication number CN105462571A discloses a low-temperature well cementation cement slurry system and composition, wherein low-temperature cement slurry consisting of 100 parts of oil well cement, 62-175 parts of oil well superfine cement, 7.3-23 parts of nano silicon dioxide, 10-32 parts of active calcium silicate, 15-50 parts of hollow glass microspheres, 3.6-10 parts of early strength agent, 3.2-8.6 parts of fluid loss agent, 0.8-2.0 parts of dispersing agent and 120-195 parts of water is disclosed. The density of the cement paste is 1.30-1.60 g/cm 3 The method is suitable for the well cementation operation of the deep sea low-temperature surface casing section at the temperature of about 15 ℃.
The research on low-temperature cement slurry is more in domestic and foreign documents. Wherein, part of the documents report PSD cement technology of Schlumberger company, the low-temperature well cementation cement paste system reaches 3.5Mpa after being maintained for 16 hours at the simulated temperature of 11 ℃ (Qinhua, dawn, tang Chun]Drilling and completion fluids, 2006,23 (6): 68-70); some documents research deep-water low-temperature well cementation cement slurry aiming at the difficulties of slow development of low-temperature set cement strength, shallow laminar flow, easy leakage and the like existing in deep-water surface layer well cementation, mainly comprises low-temperature early-strength cement, a density lightening admixture and a matched additive, and the cement slurryThe density is 1.2-1.7 g/cm 3 The low-temperature strength of the cement paste is fast to develop, the system is stable, the cement paste can be applied in the range of 4-20 ℃, and the cement paste has better comprehensive performance (square column mat, construction province, luguang, and the like; research on deepwater low-temperature well cementation cement paste [ J]Oil drilling processes, 2010,32 (1): 40-43); part of documents aims at the problem of slow development of early strength of coal bed gas low-temperature well cementation and deep water surface casing well cementation by adding colloidal SiO 2 The sulfate and the alcamines are compounded three-element to develop a compound type chlorine-free early strength agent AA, and a set of density of 1.35-1.87 g/cm is formed by adding a lightening material and a matched additive into the cement 3 The low-temperature well cementation cement slurry system has 24h compressive strength reaching 13MPa (jade ring, hou yu, guosheng) at the temperature of 30℃, and the indoor research of the low-temperature well cementation cement slurry system [ J]Drilling and completion fluids 2016,33 (1): 79-83); some other documents research the conventional performance change of low-temperature well cementation cement slurry before and after adding the redispersible latex powder at different temperatures between 10 ℃ and 60 ℃, and find that the redispersible latex powder can obviously reduce the permeability of set cement, improve the interface cementation strength, and the lower the curing temperature, the longer the thickening time (Wang Xuguang. Redispersible latex powder has influence on the performance of the low-temperature well cementation cement slurry [ J]Drilling and completion fluids 2015,32 (6): 65-71).
At present, cement paste systems which are really suitable for low temperature in the cement paste technology at home and abroad, particularly for well cementation in a frozen soil area below 0 ℃ are rarely reported, and even low-density cement paste systems at 4-8 ℃ are few, have higher cost and are more suitable for deep sea well cementation. The oil well cement slurry system and the additive which can be used in the frozen soil area have few types, and the effect is not obvious under the negative temperature, so the requirement of the well cementation operation of the frozen soil layer in the cold sea area of the polar region is difficult to meet.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a negative temperature well cementation cement slurry in a frozen soil area. In particular to negative temperature well cementation cement slurry in a frozen soil area and a preparation method and application thereof. The negative temperature well cementation cement slurry in the frozen soil area has good rheological property, can be cured within 3 hours at the temperature of 18 ℃ below zero, has the compressive strength of higher than 2MPa and can reach 6MPa within 24 hours, effectively solves the problems that the conventional cement slurry in the negative temperature environment causes no curing and no strength of cement due to liquid phase segregation freezing, has poor well cementation quality in the low temperature frozen soil area, and even can not perform well cementation operation completely, and meets the well cementation construction requirements of the frozen soil area.
One of the purposes of the invention is to provide the negative temperature well cementation cement slurry in the frozen soil area, which mainly comprises modified aluminate cement, a negative temperature antifreezing early strength agent, an alcohol ammonia coagulant, a light metal expanding agent, a non-ionic polymer fluid loss agent and water, and specifically comprises the following components in parts by weight:
100 parts of modified aluminate cement, namely 100 parts of modified aluminate cement,
6 to 15 parts of negative temperature antifreezing early strength agent, preferably 6 to 10 parts,
0.05 to 3 parts of alcohol-ammonia coagulant, preferably 0.05 to 1 part,
0 to 5 parts of light metal expanding agent, preferably 2 to 5 parts,
0 to 6 parts of nonionic polymer fluid loss agent, preferably 2 to 6 parts, more preferably 3 to 4 parts,
40-44 parts of water.
Most preferably, the following components are included in parts by weight:
100 parts of modified aluminate cement, namely 100 parts of modified aluminate cement,
6 to 10 portions of negative temperature antifreezing early strength agent,
0.05 to 1 portion of alcohol ammonia coagulant,
2 to 5 parts of light metal expanding agent,
2 to 6 portions of non-ionic polymer fluid loss agent,
40-44 parts of water.
The cement system introduces the negative temperature antifreezing early strength agent and the alcohol-ammonia coagulant on the basis of the modified aluminate cement, improves the frost resistance and the fluidity of the cement paste, and still has good fluidity and hydration curing capability at the temperature of 18 ℃ below zero.
The modified aluminate cement is compound aluminate cement. Specifically, the compound aluminate cement comprises the following components in percentage by weight: 20-70% of high-alumina cement, 5-20% of gypsum and 20-60% of superfine portland cement; preferably comprises the following components in percentage by weight: 40-70% of high alumina cement, 5-20% of gypsum and 20-50% of superfine portland cement; more preferably comprises the following components in percentage by weight: 50-60% of high alumina cement, 5-15% of gypsum and 30-45% of superfine portland cement.
The preparation method of the modified aluminate cement comprises the following steps: grinding the G-grade oil well cement in a ball mill for 0.5 to 4 hours at a high speed to prepare superfine portland cement; and weighing the high-alumina cement, the gypsum and the superfine portland cement according to the proportion, and then dry-mixing the materials uniformly to obtain the modified aluminate cement.
The negative temperature antifreezing early strength agent can be at least one composite early strength agent selected from ethylene glycol, calcium nitrate, calcium chloride, sodium chloride, potassium chloride, sodium chlorate, sodium aluminate, sodium nitrite or lithium oxide, and preferably at least one composite early strength agent selected from calcium nitrate, calcium chloride, sodium nitrite and sodium aluminate.
Preferably, the negative-temperature antifreezing early strength agent comprises the following components in percentage by weight:
5 to 10 percent of calcium nitrate,
50 to 80 percent of calcium chloride,
10 to 20 percent of sodium chloride,
0.1 to 0.2 percent of sodium nitrite,
2 to 20 percent of sodium aluminate.
More preferably, the negative-temperature antifreezing early strength agent can comprise the following components in percentage by weight:
5 to 8 percent of calcium nitrate,
60 to 70 percent of calcium chloride,
10 to 15 percent of sodium chloride,
0.1 to 0.2 percent of sodium nitrite,
12 to 20 percent of sodium aluminate.
The preparation method of the negative-temperature antifreezing early strength agent can comprise the following steps: and weighing the calcium nitrate, the calcium chloride, the sodium nitrite and the sodium aluminate according to the proportion, and then dry-mixing the materials uniformly to obtain the negative temperature antifreezing early strength agent.
The alcohol ammonia coagulant can be at least one selected from triethanolamine, monoethanol diisopropanolamine, diethanol monoisopropanolamine or triisopropanolamine, preferably triethanolamine and/or monoethanol diisopropanolamine.
The light metal expanding agent may be a metal expanding agent commonly used in the art, and specifically may be at least one of magnesium oxide, calcium oxide, and aluminum oxide, preferably magnesium oxide.
The nonionic polymer fluid loss agent can be a nonionic polymer fluid loss agent commonly used in the field, specifically can be at least one of AMPS terpolymer, cellulose sulfate, hydrolyzed polypropylene polyacrylonitrile and polyalkenamide polymer, and preferably is AMPS terpolymer.
Cement hydration is a very complex physical and chemical change process, and the action of negative temperature on cement paste generally has two aspects: firstly, when the temperature is lower than 0 ℃, the water molecule film on the surface of the cement particles is at the thermodynamic equilibrium point of phase change, water molecules can not permeate into the cement particles due to the partial pressure effect of icing, the solidification speed of the system is far lower than the icing speed, and the hydration process can hardly be carried out; secondly, the hydration reaction rate of the cement particles and the liquid phase water is gradually slowed down along with the reduction of the temperature. Research shows that the water dispersed in capillary pores of cement paste is still partially in liquid phase state at-10 deg.c, -20 deg.c and even lower than-30 deg.c. But the hydration reaction between cement and water is very slow at temperatures below-10 c. Therefore, the key to realize the solidification of the cement slurry at negative temperature is to reduce the liquid-phase freezing point of the cement slurry; secondly, the continuous proceeding of hydration and solidification reaction of cement particles and water molecules under negative temperature is promoted.
The negative-temperature antifreezing early strength agent in the negative-temperature cement slurry system of the frozen soil region developed by the method is rich in Ca 2+ 、Na + 、Al 3+ The plasma has the double effects of reducing the liquid phase freezing point of the system and improving the negative temperature hydration speed of cement particles. The components contained in the cement paste not only can change the concentration of liquid phase ions of the cement paste to form hydrated ions with water molecules and destroy the arrangement of the water molecules, so that the water molecules are not easy to form hydrogen bonds to freeze, the cement paste is ensured to have enough liquid phase at negative temperature, but also can be compounded with an alcohol-ammonia coagulant to jointly promote C 3 A is hydrated to generate water-insolubleAluminate precipitation, increase C in cement 3 The hydration rate of A and calcium hydroxide react to form insoluble precipitate, so as to reduce the concentration of calcium hydroxide in liquid phase and speed C 3 And S is hydrated, and the generated double salt can increase the solid-phase ratio of the slurry and promote the continuous generation of a muddy water hydration product under the negative temperature condition.
The main mineral components of the modified high-alumina cement developed by the method are CA and CA 2 The gypsum also contains part of superfine C 3 S and other aluminates. The cement has the multiple characteristics of high-alumina cement, PSD cement and G-grade cement. According to the study, CA 2 Under the condition of-5 deg.C, even if it has no external additive, it can be solidified by hydration, and under the condition of-20 deg.C, its strength can be up to 80% of final strength after one day, so that it possesses large low-temp. hydration capacity. CA and CA in the cement component under the condition of negative temperature when water is contacted with negative temperature cement in frozen soil area 2 The gypsum and the gypsum can be subjected to hydration curing reaction firstly, and the main hydration reaction process is as follows:
CaO·Al 2 O 3 +10H 2 O→CaO·Al 2 O 3 ·10H 2 o (abbreviated as CAH) 10 ) (1)
2CA 2 +13H 2 O→2CAH 10 +2AH 3 (2)
CA+CaCO 3 +17H 2 O→C 3 A·CaCO 3 ·11H 2 O+2(Al 2 O 3 ·3H 2 O) (3)
6CA 2 +CaCO 3 +26H 2 O→C 3 A·CaCO 3 ·11H 2 O+5(Al 2 O 3 ·3H 2 O) (4)
Followed by ultra-fine C 3 S particles in coagulant and CA, CA 2 Reduction of hydration C 3 The following hydration reactions occur under the dual effect of the S hydrolysate concentration:
C 3 S+2H 2 O→C-S-H+Ca(OH) 2 (5)
wherein, CA and CA 2 The hydration product CAH of 10 Belonging to the hexagonal system, the crystals of which are in the form of plates or needles and are mutually connectedThe crossing and overlapping can form strong crystal consortium to make the cement obtain high mechanical strength. The aluminum hydroxide gel is filled in the gaps of the crystal skeleton, and can form a compact structure. CAH 10 Are metastable phases and over time these hydrates are directed to form stable hydration products C 3 AH 6 And (4) converting the direction. This is a spontaneous process, and the transformation results in a change in the internal structure of the set cement, which reduces the later strength of the set cement. And C 3 C-H-S generated by S hydration has higher strength and stability, and can just make up for the decline of later strength of the set cement and improve the overall mechanical property.
All components in the negative temperature well cementation cement slurry system in the frozen soil area are mutually connected and act synergistically to reduce adverse effects of negative temperature conditions on cement slurry curing, realize hydration curing of cement in the negative temperature environment and enable the negative temperature cement slurry system in the frozen soil area to meet well cementation construction requirements of surface strata in the extremely cold condition of the extremely cold sea area.
The invention also aims to provide a preparation method of the negative temperature well cementation cement slurry in the frozen soil area, which specifically comprises the following steps:
dissolving the negative temperature antifreezing early strength agent in water to form a slurry mixing solution, taking out the slurry mixing solution, pouring the slurry mixing solution into a slurry cup, adding the components including the modified aluminate cement, the alcohol-ammonia coagulant, the light metal expanding agent and the nonionic polymer fluid loss agent under the stirring state, and uniformly stirring to obtain the negative temperature well cementation cement slurry in the frozen soil area.
Furthermore, in order to truly simulate the low-temperature condition test sample of the extremely cold environment under the indoor condition, the invention can adopt the method that the sample is cooled and poured into the slurry cup after the slurry solution is prepared. The temperature reduction can be specifically reduced to-10 to-18 ℃.
The method specifically comprises the following steps: dissolving the negative-temperature antifreezing early strength agent in water to form a slurry preparation solution, cooling (the solution can be placed in a freezer until the temperature of the solution is reduced to the experimental target temperature), taking out the cooled slurry preparation solution, immediately pouring the cooled slurry preparation solution into a slurry cup, and starting slurry preparation, so that the influence of room temperature on slurry preparation of cement slurry is avoided as much as possible. Cement slurry formulation and performance testing was performed according to API RP10B oil well cement test method, release 22 standard. Specifically, the mixer can be started to keep the temperature at 4000r/min, the components including the modified aluminate cement, the alcohol-ammonia coagulant, the light metal expanding agent and the non-ionic polymer fluid loss agent are added within 15s, a cover of a slurry cup is covered, and the mixture is stirred for 35s at 12000r/min, so that the negative temperature well cementation cement slurry in the frozen soil area is obtained.
Immediately after the slurry preparation, the cement slurry is poured into a standard thickening instrument cup and is placed in an environment at the temperature of 18 ℃ below zero for curing. The setting time and the compressive strength test are carried out at the temperature of-18 ℃. The slurry preparation method can highly simulate the slurry preparation process under the outdoor negative temperature environment.
The third purpose of the invention is to provide the application of the negative temperature well cementation cement slurry in the frozen soil area as the well cementation cement slurry in the frozen soil area, wherein the temperature of the frozen soil area is below 0 ℃, and preferably-10 to-18 ℃.
Effects of the invention
The technical scheme of the invention aims at the difficult problem that well cementation cement is not solidified, improves the early strength of cement slurry under the negative temperature condition, develops a negative temperature cement system with strong cold resistance and fast development of the early strength, and can solve the problem of poor low temperature tolerance of the negative temperature well cementation cement in the cold sea area of the polar region. The modified aluminate cement has the hydration hardening capacity at the temperature of-18 ℃ and has higher early strength; the negative temperature antifreezing early strength agent can change the ion concentration in the cement slurry phase, lower the freezing point, ensure that the cement slurry has enough liquid phase at negative temperature, ensure that the cement particles can be continuously hydrated, and promote the C in water and cement 3 A reacts to generate water-insoluble aluminate precipitate to accelerate C in cement 3 Hydrating the A; secondly, the calcium hydroxide can react with the calcium hydroxide to generate precipitate which is difficult to dissolve in water, thereby reducing the concentration of the calcium hydroxide in a liquid phase and accelerating the C 3 S is hydrated, and the generated double salt can increase the solid-phase ratio of the slurry and accelerate the formation of set cement; and the coagulant is soluble salt, has salt effect, can increase the solubility of the cement clinker in water and quickens the hydration of the cement clinker. The light metal expanding agent can expand the volume of the cement when the cement is solidified, and plays a role in compensating the low-temperature-resistant cement hydration volume shrinkage. Introduction of non-ionic polymersThe compound fluid loss agent is characterized by the fluid loss and rheological property of the regulator cement paste. The negative temperature well cementation cement slurry system in the frozen soil area can be solidified in 0.5-3 hours at the temperature of-18 ℃, the thickening time is adjustable, and the 24-hour compressive strength is higher than 2MPa and can reach 6MPa.
With the exploration and development of oil and gas resources to the arctic cold sea, the severe environmental conditions of low-temperature frozen soil areas and complex geological conditions, the drilling operation faces more risks and challenges. All major petroleum companies and technical service companies in the world strive to develop a new generation of polar drilling technology, and the key technology of the polar drilling in China is still at the beginning stage. Therefore, in the process of developing practical projects, china is often restricted by the technical and powerful foreign companies. Through the research of the project, a low-temperature cement slurry system with excellent performance suitable for the low-temperature condition of a frozen soil area is developed, the requirements of polar region well cementation operation are met, the smooth drilling construction in the polar region is ensured, the technical economy of future arctic oil-gas international cooperation is taken high, the speaking right of China in the international polar region energy development is increased, the national rights and interests are maintained, the energy safety of China is ensured, and the low-temperature cement slurry system has great practical value and economic and social benefits.
Detailed Description
The present invention is further illustrated by the following examples. However, the present invention is not limited to these examples. Sources of raw materials for this application
The modified aluminate cement is a compound aluminate cement, and the compound aluminate cement comprises the following components in percentage by weight: 60% of high-alumina cement, 5% of gypsum and 35% of superfine portland cement; the preparation method of the superfine portland cement comprises the following steps: and grinding Jiahua G-grade oil well cement in a ball mill at high speed for 2 hours to obtain the superfine portland cement. The high-alumina cement is Jianai CA50 high-alumina cement. Adding gypsum and superfine portland cement into the CA50 high-alumina cement according to the proportion, and dry-mixing uniformly to obtain the modified aluminate cement.
The negative-temperature antifreezing early strength agent comprises the following components in percentage by weight: 5% of calcium nitrate, 60% of calcium chloride, 15% of sodium chloride, 0.1% of sodium nitrite and 19.9% of sodium aluminate; weighing the components according to the proportion, and then dry-mixing the components uniformly to obtain the negative temperature antifreezing early strength agent.
The alcohol ammonia coagulant is analytically pure triethanolamine, and the manufacturer: neutralize Shengtai.
The light metal expanding agent is magnesium oxide, and the manufacturer comprises the following components: tianjin Dingshengxin chemical Co., ltd.
The nonionic polymer fluid loss agent is AMPS terpolymer, and the manufacturing factory: jinan Nuo chemical Co.
Example 1
6 parts of the negative temperature anti-freezing early strength agent is dissolved in 44 parts of water to form a prepared slurry solution, and the prepared slurry solution is placed in a freezer until the temperature of the solution is reduced to-18 ℃. Pouring the slurry preparation solution at the temperature of-18 ℃ into a slurry cup, starting a stirrer to stir at a low speed, quickly adding 100 parts of modified aluminate cement, 0.05 part of alcohol-ammonia accelerator, 2 parts of light metal expanding agent and 3 parts of non-ionic polymer fluid loss agent which are weighed according to the proportion, and stirring at a high speed for 1min to obtain the negative temperature well cementation cement slurry in the frozen soil area.
Example 2
9 parts of the negative-temperature antifreezing early strength agent is dissolved in 44 parts of water to form a slurry preparation solution, and the solution is placed in a freezer until the temperature of the solution is reduced to-18 ℃. Pouring the slurry preparation solution with the temperature of 18 ℃ below zero into a slurry cup, starting a stirrer to stir at a low speed, quickly adding 100 parts of modified aluminate cement, 0.5 part of alcohol-ammonia coagulant, 2 parts of light metal expanding agent and 3 parts of nonionic polymer fluid loss agent which are weighed according to a ratio, and stirring at a high speed for 1min to obtain the negative temperature well cementation cement slurry in the frozen soil area.
Example 3
10 parts of the negative temperature antifreeze early strength agent is dissolved in 44 parts of water to form a prepared slurry solution, and the prepared slurry solution is placed in a freezer until the temperature of the solution is reduced to-18 ℃. Pouring the slurry preparation solution at the temperature of-18 ℃ into a slurry cup, starting a stirrer to stir at a low speed, quickly adding 100 parts of modified aluminate cement, 1 part of alcohol-ammonia accelerator, 2 parts of light metal expanding agent and 3 parts of non-ionic polymer fluid loss agent which are weighed according to a proportion, and stirring at a high speed for 1min to obtain the negative temperature well cementation cement slurry in the frozen soil area.
Example 4
15 parts of the negative-temperature antifreezing early strength agent is dissolved in 44 parts of water to form a slurry preparation solution, and the solution is placed in a freezer until the temperature of the solution is reduced to-18 ℃. Pouring the slurry preparation solution at the temperature of-18 ℃ into a slurry cup, starting a stirrer to stir at a low speed, quickly adding 100 parts of modified aluminate cement, 3 parts of alcohol-ammonia coagulant, 2 parts of light metal expanding agent and 3 parts of non-ionic polymer fluid loss agent which are weighed according to the proportion, and stirring at a high speed for 1min to obtain the negative temperature well cementation cement slurry in the frozen soil area.
Comparative example 1
100 parts of Jiahua G-grade oil well cement, 3 parts of alcohol-ammonia coagulant, 5 parts of light metal expanding agent and 3 parts of nonionic polymer fluid loss agent are added into 44 parts of water, stirred at high speed for 1min to obtain the cement slurry. Examples of Performance testing
The cement slurry for negative temperature well cementation in the frozen soil area prepared in the examples 1 to 4 and the cement slurry prepared in the comparative document 1 are subjected to initial \ setting time and compressive strength tests, and the test results are shown in the following table 1 by specifically referring to the method of GB/T19139-2012.
TABLE 1 cement slurry for well cementation at negative temperature in permafrost region and ordinary cement slurry initial \ final setting time and compressive strength (-18 ℃ C.)
Note: the initial and final setting and compressive strength were tested under the-18 ℃ curing conditions in a freezer.
From experimental results, when the environmental temperature is-18 ℃, the initial setting time of the negative temperature well cementation cement slurry in the permafrost region is adjustable from 0.5h to 3h, the cement slurry has good low-temperature curing performance, and the 24h compressive strength is higher than 2MPa and can reach 6MPa. The cement paste of comparative example 1 is placed in an environment at 18 ℃ below zero for 10min, ice crystals can be seen, the cement paste is completely frozen after 1h, the cement paste is taken out after 24h and placed in a drying oven at 50 ℃ for 0.5h to be melted, and a sample is in a slurry state, is not solidified and has no strength. As can be seen, the conventional oil well cement has no hydration and solidification capability at-18 ℃, and can not meet the well cementation requirement of a frozen soil area. The negative temperature well cementation cement slurry in the frozen soil area has obvious advantages in the environment, the setting time is adjustable, and the early strength also meets the construction requirement.
Claims (6)
1. The negative temperature well cementation cement slurry in the frozen soil region comprises the following components in parts by weight:
100 parts of modified aluminate cement, namely 100 parts of modified aluminate cement,
6 to 15 portions of negative temperature antifreezing early strength agent,
0.05 to 3 parts of alcamines coagulant,
2 to 5 parts of light metal expanding agent,
0 to 6 parts of AMPS terpolymer,
40-44 parts of water;
the modified aluminate cement comprises the following components in percentage by weight: 50-60% of high-alumina cement, 5-15% of gypsum and 30-45% of superfine portland cement;
the preparation method of the superfine portland cement comprises the following steps: grinding the G-grade oil well cement in a ball mill for 0.5 to 4 hours at a high speed to prepare superfine portland cement;
the negative-temperature antifreezing early strength agent comprises the following components in percentage by weight:
5 to 10 percent of calcium nitrate,
50 to 80 percent of calcium chloride,
10 to 20 percent of sodium chloride,
0.1 to 0.2 percent of sodium nitrite,
sodium aluminate 2-20%;
the alcohol amine coagulant is selected from at least one of triethanolamine, monoethanol diisopropanolamine, diethanol monoisopropanolamine or triisopropanolamine;
the light metal expanding agent is at least one of magnesium oxide and calcium oxide.
2. The negative temperature well cementation cement slurry for the permafrost region as claimed in claim 1, characterized by comprising the following components in parts by weight:
100 parts of modified aluminate cement, namely 100 parts of modified aluminate cement,
6 to 10 portions of negative temperature antifreezing early strength agent,
0.05 to 1 part of alcamines coagulant,
2 to 5 parts of light metal expanding agent,
2 to 6 portions of AMPS terpolymer,
40 to 44 parts of water.
3. The negative temperature well cementation cement slurry for the frozen soil area as claimed in claim 1, wherein:
the alcohol amine coagulant is selected from triethanolamine and/or monoethanol diisopropanolamine.
4. The preparation method of the negative temperature well cementation cement slurry for the permafrost region according to any one of claims 1 to 3, characterized by comprising the following steps:
dissolving the negative temperature antifreezing early strength agent in water to form a slurry preparation solution, taking out the slurry preparation solution, pouring the slurry preparation solution into a slurry cup, adding the components including the modified aluminate cement, the alcamines coagulant, the light metal expanding agent and the AMPS ternary polymer under the stirring state, and uniformly stirring to obtain the negative temperature well cementation cement slurry in the frozen soil area.
5. The use of the negative temperature well cementation cement slurry in the permafrost region as the well cementation cement slurry in the permafrost region according to any one of claims 1 to 3, wherein the temperature of the permafrost region is below 0 ℃.
6. Use according to claim 5, characterized in that the temperature of the permafrost region is-10 to-18 ℃.
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| CN113683336B (en) * | 2021-09-14 | 2022-11-04 | 中海油田服务股份有限公司 | Preparation method of composite early strength agent and application of composite early strength agent in deep water well cementation |
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