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Water loss reducing agent used for well cementation in deepwater at low temperature and preparation method thereof

A fluid loss reducing agent, low temperature technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of low concentration of fluid loss reducing agent, uneconomical transportation, storage and use, uneven mixing, etc. Achieve high effective concentration, save material storage space, and simplify the effect of on-site use

Active Publication Date: 2013-05-08
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinyl alcohol fluid loss reducer in powder form needs to be dry mixed with cement in advance, and it is easy to cause uneven mixing
At present, the concentration of polyvinyl alcohol fluid loss reducers in liquid form is generally low, and the concentration does not exceed 15%, which is uneconomical in transportation, storage and use.

Method used

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  • Water loss reducing agent used for well cementation in deepwater at low temperature and preparation method thereof
  • Water loss reducing agent used for well cementation in deepwater at low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] formula:

[0025] Sodium thiosulfate pentahydrate (Langfang Asia Pacific Longxing Chemical Co., Ltd., industrial grade), 47%;

[0026] Polyvinyl alcohol BP-24 (Taiwan Chunguang Company, industrial grade), 30%;

[0027] The balance is deionized water.

[0028] The method for preparing the fluid loss reducer of the above formula is:

[0029] Add sodium thiosulfate pentahydrate and water into the reaction kettle and stir to dissolve, then slowly add polyvinyl alcohol and stir evenly to obtain the fluid loss reducer for low-temperature well cementing in deep water.

[0030] The measured solid content of the fluid loss reducer was 60% (mass percentage), consistent with the calculated value. The fluid loss reducer is effective when used immediately after preparation. However, the fluid loss reducer is easy to segregate, and there will be stratification after a period of time, so it is not suitable for long-term storage and use.

Embodiment 2

[0032] formula:

[0033] Polyether defoamer Basopur DF5 (German BASF company), 0.5%;

[0034] Xanthan gum XC-CH (Hebei Xinhe Biochemical Co., Ltd., industrial grade), 0.2%;

[0035] Sodium thiosulfate pentahydrate (Langfang Asia Pacific Longxing Chemical Co., Ltd., industrial grade), 47%;

[0036] Polyvinyl alcohol BP-24 (Taiwan Chunguang Company, industrial grade), 30%;

[0037] Sodium benzoate (Tianjin Xin Dayu Chemical Co., Ltd., industrial grade), 0.3%;

[0038] The balance is deionized water.

[0039] The method for preparing the fluid loss reducer of the above formula is:

[0040] Weigh deionized water and xanthan gum, and at room temperature, dissolve xanthan gum in water in a reactor with a stirring device, completely dissolve and increase viscosity, then add polyether defoamer Basopur DF5 and stir evenly, Add sodium thiosulfate pentahydrate and stir to dissolve. After fully stirring and dissolving, add polyvinyl alcohol and stir evenly, add sodium benzoate and st...

Embodiment 3

[0043] The fluid loss reducer (named G72LA, prepared according to Example 2) of the application for deepwater low-temperature cementing was combined with the G72S fluid loss reducer in the traditional powder form (purchased from Tianjin Zhonghai Oilfield Chemical Co., Ltd.) and the G72L in liquid form ( purchased from Tianjin Zhonghai Oilfield Chemical Co., Ltd.) for performance testing.

[0044] Table 1 lists the cement slurry properties measured under the conditions of 10°C, 20°C and 50°C using G72LA fluid loss reducer of the present application, G72S fluid loss reducer in traditional powder form and G72L in liquid form.

[0045] Table 11.50S.G Cement Slurry Formula and Performance Evaluation

[0046]

[0047]

[0048] Note: 1. BWOC is the amount of other admixtures calculated based on the weight percentage of cement;

[0049] 2. X601L is ether defoamer, G72S is traditional PVA fluid loss reducer, G72L is traditional liquid PVA fluid loss reducer (effective concentrat...

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Abstract

The invention relates to a water loss reducing agent used for well cementation in deepwater at a low temperature. The water loss reducing agent is a water suspension comprising polyvinyl alcohol and thiosulfate. The water loss reducing agent provided by the invention has dual functions of reducing water loss and coagulating at a low temperature, an effect of 'one agent with dual purposes' is realized, and field service is simplified; meanwhile, the water loss reducing agent can be directly added into well cementation mixed water to be used instead of being dryly mixed with cement, and effective concentration of a water loss reducing component is high, so that a limited material storage space of an offshore platform can be effectively saved.

Description

technical field [0001] The present application relates to a fluid loss reducer, more specifically, to a fluid loss reducer for deepwater low-temperature cementing and a preparation method thereof. Background technique [0002] At present, the development of offshore oil and gas fields is still mainly concentrated in the area near the continental shelf. For deep water areas with rich oil and gas resources, where the operating water depth is greater than 500m, development efforts need to be increased. In the exploration and development of deep water areas, the cementing profession faces difficulties such as low temperature, shallow flow, soft formation, abnormal high pressure, and narrow "window". The requirements for the performance of cement slurry are: ①At low temperature, the transition time of cement slurry is required to be short and the compressive strength is high; ②The density of cement slurry should be low; ③Low friction resistance and high displacement efficiency a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 符军放赵琥张浩王清顺宋茂林项先忠
Owner CHINA NAT OFFSHORE OIL CORP
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