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Low-temperature low-density well cementing cement mortar

A cementing slurry, low density technology, applied in the field of cement slurry, can solve the problems of high construction requirements, out of control pressure, chemical foaming is difficult to control the speed and quantity of gas generation, etc., so that the thickening time is easier to control and work. Procedurally simple effects

Active Publication Date: 2009-09-30
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. The existence of shallow flow is prone to pressure runaway;
[0006] 4. The existence of gas hydrates may cause the release of hydrates during the cementing operation
The disadvantage of foamed cement slurry is that it has high requirements for construction, and mechanical nitrogen filling requires additional nitrogen supply equipment, control equipment and special operators; while chemical foaming is difficult to control the speed and quantity of gas generation

Method used

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  • Low-temperature low-density well cementing cement mortar
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  • Low-temperature low-density well cementing cement mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1170

[0016] Example 11.70g / cm 3 Grout

[0017] First prepare the fluid loss reducer, according to deionized water 1200g, NNDMAM (N, N-dimethylacrylamide) 30.0g, AMPS (2 acrylamide-2 methylpropanesulfonic acid) 264g, (NH4) 2 S 2 o 8 1.5g, EDTA (ethylenediaminetetraacetic acid) 7.5g, NaOH 60.0g Weigh each component. The preparation steps are as follows: deionized water is poured into a 2000ml beaker, and then NNDMAM, AMPS, (NH 4 ) 2 S 2 o 8 , EDTA were dissolved in water in sequence; then pass N 2 20-40 minutes, heat to 60°C to start the reaction, stop heating when heated to 90°C, control the reaction temperature below 90°C, keep it at 70-85°C for 2 hours, discharge, then add solid NaOH to adjust the pH to medium The color of the product is light yellow. The prepared polymer has a solid content of about 20-30%.

[0018] Secondly, prepare the cement slurry: use a cement slurry mixing cup to measure 280g of water (for the convenience of configuration, you can also choose seaw...

Embodiment 2140

[0024] Example 21.40g / cm 3 Grout

[0025] First prepare fluid loss reducer, according to water 1036g, NNDMAM (N, N-dimethylacrylamide) 62.0g, AMPS (2 acrylamido-2 methylpropanesulfonic acid) 392g, (NH4) 2 S 2 o 8 4.7g, EDTA (ethylenediaminetetraacetic acid) 11.0g, NaOH 62.7g Weigh each component, and then prepare according to the preparation method of Example 1.

[0026] Secondly, weigh each component according to: 360g of fine high-strength cement, 240g of water, 1g of coagulation accelerator, 6.4g of retarder, 36g of fluid loss reducer, 1g of dispersant, 3.6g of stabilizer, 70g of auxiliary lightening agent, and carry out the rest. Mode is the same as embodiment 1.

[0027] The test results of the low-temperature and low-density cementing slurry in this embodiment are shown in Table 2 below.

[0028] Table 2 Density 1.40g / cm 3 Grout

[0029]

Embodiment 3130

[0030] Example 31.30g / cm 3 Grout

[0031] First prepare the fluid loss reducer, according to water 1327g, NNDMAM (N, N-dimethylacrylamide) 15.7g, AMPS (2 acrylamide-2 methylpropanesulfonic acid) 188g, (NH4) 2 S 2 o 8 1.6g, EDTA (ethylenediaminetetraacetic acid) 4.7g, NaOH 31.4g Weigh each component, and then prepare according to the preparation method of Example 1.

[0032] Secondly, according to the thickness of high-strength cement 300g (50% fine, 50% thick, the ratio is percentage by weight), water 240g, coagulant 1.2g, retarder 5.8g, fluid loss reducer 36g, dispersant 0.9g, stable Agent 3g, auxiliary alleviating agent 100g weigh each component, all the other embodiments are the same as embodiment 1.

[0033] The test results of the low-temperature and low-density cementing slurry of this embodiment are shown in Table 3 below.

[0034] Table 3 Density 1.30g / cm 3 Grout

[0035]

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Abstract

This invention relates to a low temperature low density cement paste for well-cementation use. It is composed (by weight percentages) of: high strength cement 40.0-62.3%; water 29.1-35%; setting accelerator 0.1-0.6%; cement retarder 0.6-0.9%; filtering-loss-reducer 4.4-5.2%; dispersing agent 0.1-0.3%; stabilizing agent 0.1-0.3%; auxiliary weight reducing agent 2-20%. This inventive low temperature low density cement paste, compared with prior art low temperature foam cement paste, has advantages of: no need of special equipment used for pouring cement paste, utilization of ordinary well-cementation equipment with controllable setting time and simple operation procedures.

Description

technical field [0001] The invention relates to a cement slurry used in ocean deep water cementing operations. Background technique [0002] Offshore deepwater oilfield development is an oilfield development process that requires a large number of advanced exploration and development technologies as a supporting means, and the cementing operation in the drilling program is a very important part of it. Ocean deep water is characterized by low temperature and high pressure. In many deep water development blocks, due to the particularity of deep water geological deposits, formation fracture pressure is low, and natural gas hydrate is easily associated below the mud-water interface, and shallow flow often exists, giving Drilling operations and well cementing bring challenges, and it is necessary to adopt different cementing technical measures for different deep-water merging situations. For complex deep-water formations, the problems encountered during cementing operations are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/16E21B33/12
CPCC04B28/02
Inventor 徐绍诚莫成孝王永松王清顺杨振宇冯克满林卫红
Owner CHINA NAT OFFSHORE OIL CORP
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