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High temperature resistant well-cementing spacer fluid and preparation method thereof

A spacer fluid and high temperature resistance technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance, solid phase particle settlement, slurry viscosity reduction, etc., and achieve good acid and alkali resistance , Improve rheology, reduce viscosity and shear effect

Active Publication Date: 2015-03-25
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing spacer fluid systems in China generally have poor temperature resistance, and problems such as slurry viscosity reduction and solid phase particle settlement are prone to occur under high temperature conditions.

Method used

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  • High temperature resistant well-cementing spacer fluid and preparation method thereof
  • High temperature resistant well-cementing spacer fluid and preparation method thereof
  • High temperature resistant well-cementing spacer fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] According to the designed density of the spacer, it is prepared according to 100 parts by weight of fresh water, 2-8 parts by weight of suspending agent, 1-15 parts by weight of flushing agent, 2-10 parts by weight of diluent, and 25-400 parts by weight of weighting agent.

[0015] First weigh fresh water, add suspending agent at 4000rpm and stir for 3 minutes, and dissolve for 30 minutes; add diluent and weighting agent at 4000rpm and stir for 10 minutes; add rinse agent at a stirring speed of 2000rpm and stir for 1 minute to prepare the spacer.

[0016] In order to test the rheological properties of the spacer fluid system, a density of 1.2 ~ 2.5g / cm 3 A total of 6 density points of spacer fluid. The experimental method is as follows: at room temperature, after stirring for 20 minutes in an atmospheric thickener, test the rheology with a six-speed rotational viscometer. From the experimental results (as shown in Tables 1 and 2), the spacer fluid system at each densit...

Embodiment 2

[0022] Prepare by 100 parts by weight of fresh water, 7 parts by weight of suspending agent, 3 parts by weight of diluent, 5 parts by weight of flushing agent and 40 parts by weight of weighting agent.

[0023] First weigh 100 parts by weight of fresh water, add 7 parts by weight of suspending agent at 4000rpm and stir for 3 minutes, dissolve for 30 minutes; add 3 parts by weight of diluent and 40 parts by weight of weighting agent at 4000rpm and stir for 10 minutes; Add 5 parts by weight of flushing agent and stir for 1 minute to prepare an isolation solution.

[0024] The measured spacer density is 1.3g / cm 3 , the temperature resistance test method of the spacer liquid system is as follows: ①The temperature is lower than 90°C, at the experimental temperature, after the spacer liquid is stirred in the normal pressure thickener for 20 minutes, test its rheology with a six-speed rotational viscometer; ② If the temperature is higher than 90°C, first raise the high-temperature r...

Embodiment 3

[0029] It is prepared according to 100 parts by weight of fresh water, 4 to 7 parts by weight of suspending agent, 4 parts by weight of diluent, 5 parts by weight of flushing agent and 80 parts by weight of weighting agent.

[0030] First weigh 100 parts by weight of fresh water, add 4 to 7 parts by weight of suspending agent at 4000rpm and stir for 3 minutes, dissolve for 30 minutes; add 4 parts by weight of diluent and 80 parts by weight of weighting agent at 4000rpm and stir for 10 minutes; Add 5 parts by weight of flushing agent at 2000 rpm and stir for 1 minute to prepare an isolation solution.

[0031] In order to test the influence of the amount of suspending agent on the rheological properties of the spacer fluid, a spacer fluid system with the same density and the same composition of admixtures was prepared. It can be seen from the experimental results (as shown in Table 5) that the amount of suspending agent has a good linear relationship with the plastic viscosity a...

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Abstract

The invention relates to a high temperature resistant well-cementing spacer fluid and a preparation method thereof. The spacer fluid consists of: 100 parts by weight of fresh water, 2-8 parts by weight of a suspending agent, 2-10 parts by weight of a diluents, 25-400 parts by weight of a weighting agent, and 1-15 parts by weight of a flushing agent. Specifically, the suspending agent is composed of 100 parts by weight of OCMA bentonite, 2 parts by weight of hydroxypropyl guar gum and 8 parts by weight of xanthan gum; the diluent is composed of 100 parts by weight of sodium lignin sulfonate and 20 parts by weight of sulfonated tannin; the flushing agent consists of 40 parts by weight of fatty alcohol-polyoxyethylene ether, 40 parts by weight of triethanolamine oleate and 20 parts by weight of sodium tripolyphosphate; and the weighting material is barite. The spacer fluid has stable performance under 180DEG C high temperature condition, still has good rheological performance under the premise of ensuring the system good suspension stability, is compatible with conventional cement slurry and drilling fluid systems, improves the rheological properties of drilling fluid, enhances the displacement efficiency, and reinforces the cementation quality of a cement ring with a well cementation first interface and a second interface.

Description

technical field [0001] The invention relates to a spacer fluid for cementing deep wells and ultra-deep wells, which can be used to separate drilling fluid and cement slurry in well cementing operations to prevent the drilling fluid and cement slurry from contacting and polluting each other. Background technique [0002] With the increasing intensity of oil and gas exploration and development year by year, there are more and more cementing operations in deep wells and ultra-deep wells. Due to the large investment, high risk and high engineering difficulty of such wells, spacer fluid plays an important supporting role in ensuring the safety of cementing operations in such wells, avoiding quality and safety accidents, and improving the isolation quality of cement slurry. In deep and ultra-deep well cementing operations, high temperature and high pressure formations are often encountered. Under high temperature conditions, spacer fluid admixtures will degrade and fail, resulting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40
CPCC09K8/40C09K8/52
Inventor 王翀马学勤邹建龙谢飞燕刘爱萍曾建国席方柱李鹏晓
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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