CN109896801B - Novel composite lightening material low-density cement paste system and preparation method thereof - Google Patents
Novel composite lightening material low-density cement paste system and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a novel composite lightening material low-density cement paste system and a preparation method thereofThe material consists of the following substances: g-grade oil well cement, fresh water, a CP-56 novel composite lightening material, a G33S oil well cement fluid loss additive, a GH-9 oil well cement retarder, a G401 oil well cement expanding agent, a USZ oil well cement drag reducer and an XP-1 defoaming agent. The invention selects the novel CP-56 composite lightening material to prepare low-cost high-strength low-density cement paste systems (density is 1.45G/cm) with different specific gravities by selecting the novel composite lightening material, G-grade oil well cement, fluid loss additive, retarder, expanding agent, drag reducer and defoaming agent3～1.75g/cm3) The method can meet the well cementation requirement of low-pressure easily-lost strata of different blocks, well seal oil-gas layers, has very low cost control, and meets the aims of energy conservation and consumption reduction of oil field production units.
Description
Technical Field
The invention relates to the technical field of petroleum well cementation. In particular to a novel composite lightening material low-density cement paste system and a preparation method thereof.
Background
Along with the progress of petroleum exploration and development, the number of easily-lost strata such as low-pressure strata, weak strata and the like is increased, a low-density cement slurry system is gradually developed and perfected along with the treatment of the complex conditions, and along with the continuous development and popularization of deep well and ultra-deep well technologies, the easily-leaked strata of deep wells and ultra-deep wells can bring serious well leakage, so that the implementation of well cementation quality and subsequent yield increasing operation is seriously influenced. To improve the cementing quality of such complex well conditions, it is necessary to perfect a low density cement slurry system. In particular, the increasing number of complex wells, long-seal well sections and low-pressure easy-to-leak wells leads to more and more complex problems in well cementation. Because the compression strength of the well cementation low density set cement also has higher requirement, the used lightening materials have higher price, and the glass beads and the floating beads are applied more at present, but the current long-term low oil price forces each oil field to seek the lightening material with lower price, and the requirement of the design of the low density cement slurry for the well cementation construction of the oil field is met on the premise of lower cost, so that the aim of better sealing the oil-gas layer is fulfilled.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a novel composite lightening material low-density cement slurry system with low cost, low density and high cement stone strength and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
the novel composite lightening material low-density cement paste system consists of the following substances: g-grade oil well cement, fresh water, a CP-56 novel composite lightening material, a G33S oil well cement fluid loss additive, a GH-9 oil well cement retarder, a G401 oil well cement expanding agent, a USZ oil well cement drag reducer and an XP-1 defoaming agent.
The novel composite lightening material low-density cement slurry system is composed of the following substances in parts by weight: 100 parts of G-grade oil well cement, 57-100 parts of fresh water, 8-50 parts of CP-56 novel composite lightening material, 0.5-2.0 parts of G33S oil well cement filtrate reducer, 0.2-2.5 parts of GH-9 oil well cement retarder, 1.0-3.0 parts of G401 oil well cement expanding agent, 0.3-0.8 part of USZ oil well cement drag reducer and 0.2-0.4 part of XP-1 defoaming agent.
According to the novel composite lightening material low-density cement slurry system, the CP-56 novel composite lightening material is composed of the following substances in parts by weight: 10-20 parts of superfine slag, 10-20 parts of superfine cement, 20-40 parts of active silica fume, 2-6 parts of G203A oil well cement early strength agent, 2-6 parts of G204 oil well cement early strength agent and 3-5 parts of G208 oil well cement early strength agent.
In the novel composite lightening material low-density cement slurry system, the superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes.
In the novel composite lightening material low-density cement slurry system, the preparation method of the G33S oil well cement fluid loss additive comprises the following steps: (1) adding 18 parts by weight of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 2 parts by weight of N, N-dimethylacrylamide, 0.3 part by weight of fumaric acid and 0.8 part by weight of acrylic acid into 60 parts by weight of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01 part by weight of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
According to the novel composite lightening material low-density cement slurry system, the preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44 parts by weight of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 7.2 parts by weight of itaconic acid, 3.5 parts by weight of maleic anhydride and 8.3 parts by weight of acrylic acid into 50 parts by weight of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3 part by weight of initiator ammonium persulfate, stirring for 10min, then adding 0.2 part by weight of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
In the novel composite lightening material low-density cement slurry system, the G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
A preparation method of a novel composite lightening material low-density cement slurry system comprises the following steps:
(1) uniformly mixing the G-grade oil well cement, the CP-56 novel composite lightening material, the G33S oil well cement fluid loss additive, the G401 oil well cement expanding agent and the USZ oil well cement drag reducer for later use to obtain a component A;
(2) putting the fresh water, the GH-9 oil well cement retarder and the XP-1 defoaming agent into a storage tank, and pumping for 2 hours to uniformly mix for later use to obtain a component B;
(3) and (3) stirring and mixing the component A and the component B uniformly through well cementation equipment to obtain the novel composite lightening material low-density cement slurry system.
The technical scheme of the invention achieves the following beneficial technical effects:
1. the invention selects the novel CP-56 composite lightening material to prepare low-cost high-strength low-density cement paste systems (density is 1.45G/cm) with different specific gravities by selecting the novel composite lightening material, G-grade oil well cement, fluid loss additive, retarder, expanding agent, drag reducer and defoaming agent3～1.75g/cm3) The method can meet the well cementation requirement of low-pressure easily-lost strata of different blocks, well seal oil-gas layers, has very low cost control, and meets the aims of energy conservation and consumption reduction of oil field production units.
2. The cement paste system prepared by the invention has the excellent performances of stable density (the cement paste pressurization density difference is less than or equal to 0.02), self-plugging, zero free water, no shrinkage of cement stone, high early strength and the like. The fluidity is good, and slurry preparation and pumping on a construction site are facilitated; the water loss control capability is good (the API water loss is controlled within 100 mL), and the underground oil-gas reservoir can be effectively protected from being polluted; the thickening time linear relation is good, the strength of the set cement develops quickly, the top strength of 24h can reach more than 5MPa, the loss can be effectively prevented, and the well cementation construction requirements of easy-to-leak wells such as weak stratums of various oil field blocks can be met. The selected materials have low price, sufficient supply, wide production area and simple and convenient pulp preparation operation. Greatly saves the production cost.
3. The novel CP-56 composite lightening material selected by the invention takes a lightening material with low price as an aggregate, an ultrafine material is added for grain composition, a plurality of early strength agents with good effect at low temperature are added, the early strength of the set cement is improved, and the formed novel CP-56 composite lightening material has the characteristics of low cost, high early strength, high pressure resistance and the like, and well meets the performance requirements of a low-density cement slurry system.
The fluid loss agent, the retarder, the expanding agent and the drag reducer have very strong adaptability, and have good compatibility in different cement paste systems, so that the comprehensive performance of the cement paste systems is excellent.
Detailed Description
Example 1
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 100kg of fresh water, 50kg of CP-56 novel composite lightening material, 1.5kg of G33S oil well cement fluid loss additive, 0.3kg of GH-9 oil well cement retarder, 1.5kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightening material low-density cement slurry system comprises the following steps:
(1) weighing G-grade oil well cement, a CP-56 novel composite lightening material, a G33S oil well cement fluid loss additive, a G401 oil well cement expanding agent and a USZ oil well cement drag reducer, and uniformly mixing for later use to obtain a component A;
(2) putting fresh water, a GH-9 oil well cement retarder and an XP-1 defoaming agent into a storage tank, and pumping for 2 hours to circulate uniformly and mix for later use to obtain a component B;
(3) and (3) stirring and mixing the component A and the component B uniformly through well cementation equipment to obtain the novel composite lightening material low-density cement slurry system.
Example 2
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 90kg of fresh water, 40kg of CP-56 novel composite lightening material, 1.2kg of G33S oil well cement fluid loss additive, 0.2kg of GH-9 oil well cement retarder, 1.2kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
Example 3
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 78kg of fresh water, 30kg of CP-56 novel composite lightening material, 1.6kg of G33S oil well cement fluid loss additive, 0.3kg of GH-9 oil well cement retarder, 1.3kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
Example 4
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 73kg of fresh water, 25kg of CP-56 novel composite lightening material, 1.5kg of G33S oil well cement fluid loss additive, 0.4kg of GH-9 oil well cement retarder, 1.0kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
Example 5
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 66kg of fresh water, 17kg of CP-56 novel composite lightening material, 1.2kg of G33S oil well cement fluid loss additive, 0.3kg of GH-9 oil well cement retarder, 1.0kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
Example 6
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 60kg of fresh water, 12kg of CP-56 novel composite lightening material, 1.3kg of G33S oil well cement fluid loss additive, 0.3kg of GH-9 oil well cement retarder, 1.0kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
Example 7
The novel composite lightening material low-density cement paste system comprises the following substances: 100kg of G-grade oil well cement, 57kg of fresh water, 8kg of CP-56 novel composite lightening material, 1.3kg of G33S oil well cement fluid loss additive, 0.2kg of GH-9 oil well cement retarder, 1.0kg of G401 oil well cement expanding agent, 0.3kg of USZ oil well cement drag reducer and 0.2kg of XP-1 defoaming agent.
The novel CP-56 composite lightening material consists of the following substances: 12kg of superfine slag, 20kg of superfine cement, 38kg of active silica fume, 4kg of G203A oil well cement early strength agent, 4kg of G204 oil well cement early strength agent and 3kg of G208 oil well cement early strength agent. The superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active silica fume is 160-300 meshes. The active micro silicon powder manufacturer is a limited responsibility company for comprehensive utilization of the Lantian resources in Sichuan.
The preparation method of the G33S oil well cement fluid loss agent comprises the following steps: (1) adding 18kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 2kg of N, N-dimethylacrylamide, 0.3kg of fumaric acid and 0.8kg of acrylic acid into 60kg of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01kg of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
The preparation method of the GH-9 oil well cement retarder comprises the following steps: (1) adding 33.44kg of 2-acrylamide-2-methylpropanesulfonic acid AMPS, 7.2kg of itaconic acid, 3.5kg of maleic anhydride and 8.3kg of acrylic acid into 50kg of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3kg of initiator ammonium persulfate, stirring for 10min, then adding 0.2kg of sodium bisulfite, and polymerizing for 40min to obtain the retarder.
The G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent.
The G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
The preparation method of the novel composite lightweight material low-density cement slurry system of the embodiment is the same as that of embodiment 1.
The material composition of the novel composite mitigation material low density cement slurry systems of examples 1-7 are shown in table 1:
TABLE 1
The results of the performance measurements of the novel composite mitigation material low density cement slurries prepared in examples 1-7 are as follows:
1. determination of basic Properties of the Cement slurries, as shown in Table 2
TABLE 2 Cement paste Property measurement results
As can be seen from Table 2, the density of the cement paste prepared by the invention can be 1.45-1.75 g/cm3The range is adjusted, the fluidity is 20-23 cm, the slurry fluidity is good, the water loss is controlled within 100ml, the thickening time is adjustable, and the comprehensive performance of the cement slurry is good.
2. The mechanical properties of the cement paste were evaluated and shown in Table 3.
TABLE 3 mechanical Properties of Cement
As can be seen from Table 3, the set cement has excellent mechanical properties, high compressive strength and high top strength, and can well seal the shale gas layer to meet the requirements of subsequent construction.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (4)
1. A composite lightening material low-density cement paste system is characterized by comprising the following substances: g-grade oil well cement, fresh water, a CP-56 composite lightening material, a G33S oil well cement fluid loss additive, a GH-9 oil well cement retarder, a G401 oil well cement expanding agent, a USZ oil well cement drag reducer and an XP-1 defoaming agent;
100 parts of G-grade oil well cement, 57-100 parts of fresh water, 8-50 parts of CP-56 composite lightening material, 0.5-2.0 parts of G33S oil well cement fluid loss additive, 0.2-2.5 parts of GH-9 oil well cement retarder, 1.0-3.0 parts of G401 oil well cement expanding agent, 0.3-0.8 part of USZ oil well cement drag reducer and 0.2-0.4 part of XP-1 defoaming agent;
the CP-56 composite lightening material comprises the following substances in parts by weight: 10-20 parts of superfine slag, 10-20 parts of superfine cement, 20-40 parts of active silica fume, 2-6 parts of G203A oil well cement early strength agent, 2-6 parts of G204 oil well cement early strength agent and 3-5 parts of G208 oil well cement early strength agent;
the superfine slag is S95-grade granulated blast furnace slag powder; the particle size of the superfine cement is 8 +/-1 micron; the particle size of the active micro silicon powder is 160-300 meshes;
the G401 oil well cement expanding agent is a lattice expanding agent; the USZ oil well cement drag reducer is an aldehyde ketone condensate; the XP-1 defoaming agent is a polyester defoaming agent;
the G203A oil well cement early strength agent, the G204 oil well cement early strength agent, the G208 oil well cement early strength agent, the G401 oil well cement expanding agent, the USZ oil well cement drag reducer and the XP-1 defoaming agent are all products which are publicly sold in the market by chemical company Limited in Wei Hui of the applicant.
2. The composite mitigation material low-density cement slurry system of claim 1, wherein the G33S oil well cement fluid loss additive is prepared by the following method: (1) adding 18 parts by weight of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 2 parts by weight of N, N-dimethylacrylamide, 0.3 part by weight of fumaric acid and 0.8 part by weight of acrylic acid into 60 parts by weight of water, uniformly stirring, (2) neutralizing with sodium hydroxide until the pH value is 5-6, pouring into a three-neck flask, stirring, heating to 50 ℃, adding 0.01 part by weight of initiator potassium persulfate, polymerizing for 1 hour, drying and crushing to obtain the G33S oil well cement fluid loss agent.
3. The composite mitigation material low-density cement slurry system of claim 1, wherein the GH-9 oil well cement retarder is prepared by the following method: (1) adding 33.44 parts by weight of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 7.2 parts by weight of itaconic acid, 3.5 parts by weight of maleic anhydride and 8.3 parts by weight of acrylic acid into 50 parts by weight of water in sequence; (2) neutralizing the solution with sodium hydroxide until the pH value is 2-3, pouring the solution into a three-neck flask, and stirring the solution; (3) heating to 48-50 ℃, adding 0.3 weight part of initiator ammonium persulfate, stirring for 10min, then adding 0.2 weight part of sodium bisulfite, and polymerizing for 40min to obtain the product.
4. A preparation method of a composite lightening material low-density cement slurry system is characterized by comprising the following steps:
(1) uniformly mixing the G-grade oil well cement, the CP-56 composite lightening material, the G33S oil well cement fluid loss additive, the G401 oil well cement expanding agent and the USZ oil well cement drag reducer according to any one of claims 1 to 3 for later use to obtain a component A;
(2) putting the fresh water, the GH-9 oil well cement retarder and the XP-1 defoaming agent which are all described in any one of the claims 1 to 3 into a storage tank, and pumping for 2 hours to be uniformly mixed for later use to obtain a component B;
(3) and (3) stirring and mixing the component A and the component B uniformly through well cementation equipment to obtain the composite lightening material low-density cement slurry system.
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| CN111040747B (en) * | 2019-11-29 | 2023-02-17 | 中国石油天然气集团有限公司 | Long horizontal section horizontal well cementing curable pad fluid and application thereof |
| CN111233363B (en) * | 2020-02-25 | 2021-10-22 | 卫辉市化工有限公司 | Low-density reinforcing agent for oil well cement and preparation method thereof |
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