Oil well cement-injection pad fluid admixture and preparation method

A technology of cement injection and prefluid, which is applied in water well cementing, natural gas, and petroleum fields. It can solve problems such as poor compatibility of cement slurry, affecting well wall stability, and difficulty in on-site preparation, so as to speed up the dissolution rate and dissolve The effect of fast speed and easy on-site preparation

Inactive Publication Date: 2008-04-16
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Sodium silicate type pre-fluid, the pre-fluid has a certain viscosity, which can improve the displacement efficiency, but the compatibility with cement slurry is not good, which affects its fluidity
[0006] Dilution prefluid, the prefluid is mainly composed of drilling fluid diluent, which can dilute the drilling fluid and improve the flushing eff...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of oil well cementing prefluid admixture test sample

[0025] Weigh 400g of sorbitan monostearate emulsifier, heat it to 90°C in a small kneader, after the sorbitan monostearate emulsifier is completely melted, open the agitator, add 600g carboxylate under stirring and kneading condition Sodium methylcellulose, after stirring and kneading for 2 hours, pass water to the kneader to cool down to room temperature. The obtained sample is pulverized to obtain the intermediate sample microcapsule emulsified viscosifier.

[0026] Take by weighing sulfonated tannin (SMT) 500g, silicon dioxide micropowder (microsilicon) 500g, sodium sulfate 250g, sodium carbonate 250g, add in the small mixer and mix for 10 minutes, then add microcapsule emulsifying tackifier 1000g and mix uniformly, The sample of oil well cementing prefluid admixture can be obtained.

[0027] Preparation of flushing solutions for laboratory use

[0028] Weigh 10g of the oil well cemen...

Embodiment 2

[0037] Embodiment 2: take by weighing 350kg sorbitan monostearate emulsifier produced by Lvshun Chemical Auxiliary Factory in Dalian City, Liaoning Province, heat to 80 ℃ in kneader, sorbitan monostearate emulsifier melts completely Afterwards, open agitator, add 650kg sodium carboxymethyl cellulose under stirring and kneading condition, after stirring and kneading for 2.5 hours, feed water to the kneader and cool to room temperature. The obtained product is pulverized to obtain the intermediate product microcapsule emulsified thickener.

[0038]Take by weighing 350kg of sulfonated tannin (SMT) produced by Chengdu Chuanfeng Chemical Engineering Co., Ltd., 350kg of silicon dioxide micropowder (microsilicon), 100kg of sodium sulfate, and 200kg of sodium carbonate, add to a mixer and mix for 15 minutes, then add and pulverize 1000kg of microcapsule emulsified viscosifier, mixed evenly, can get 2000kg of oil well cementing prefluid admixture used on site.

Embodiment 3

[0039] Embodiment 3: take by weighing 270kg sorbitan monostearate emulsifier, be heated to 85 ℃ in the kneader, after sorbitan monostearate emulsifier melts completely, open agitator, under stirring kneading condition Add 630 kg of sodium carboxymethylcellulose, stir and knead for 2.5 hours, then cool the kneader with water and cool to room temperature. The obtained product is pulverized to obtain the intermediate product microcapsule emulsified thickener.

[0040] Take by weighing sulfonated tannin (SMT) 418kg, silicon dioxide micropowder (microsilicon) 352kg, sodium sulfate 198kg, sodium carbonate 132kg, add in mixer and mix 20 minutes, then add the microcapsule emulsifying tackifier 900kg that pulverizes, Mix evenly to obtain 2000 kg of oil well cementing pre-fluid admixture for on-site use.

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Abstract

The invention provides a lead admixture for oil well cement, which is used in cementing operation. The invention is characterized in that: the invention comprises microcapsule emulsified tackifier and diluting, grinding, antigelling agent, the weight percent of the two components is 40 to 50 percent:50 to 60 percent, wherein, the weight percent of the composition of microcapsule emulsified tackifier is as follows: 30 to 40 percent of Sorbitan Monostearate emulsifying agent, 60 to 70 percent of sodium carboxymethylcellulose; and the weight percent of the composition of the diluting, grinding and antigelling agent is as follows: 30 to 40 percent of sulfonated tannin, 30 to 40 percent of fine silica powder, 10 to 25 percent of sodium sulfate, and 10 to 25 percent of sodium carbonate. The invention has the advantages that: the lead compounded by the lead admixture for oil well cement has good slurrycompatibility with drilling fluid and oil well grout. And flushing fluid, weighted spacer fluid, viscoelastic spacer fluid and displacement fluid can be prepared by compounding with the lead admixture for oil well cement. The lead admixture for oil well cement has the characteristic of high dissolution rate and easy field compounding.

Description

technical field [0001] The invention relates to the technical field of oil, natural gas and water well cementing, in particular to a cementing prefluid admixture for well cementing, and is a preparation method capable of preparing flushing fluid, spacer fluid and plugging fluid admixture for cementing and cementing slurry . Background technique [0002] Before oil and gas well cementing and injecting slurry, in order to isolate the cement slurry from the drilling fluid and improve the displacement efficiency, a liquid needs to be injected between the cement slurry and the drilling fluid, and the injected liquid is called the slurry pre-fluid. Why use grout pre-fluid? Because the cement slurry phase is saturated with C a (OH) 2 Once the solution is mixed with the drilling fluid, the clay component in the drilling fluid will undergo calcium invasion to form a viscous flocculation substance, making the mixture a jelly with extremely poor fluidity or no flow; in addition, the...

Claims

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Application Information

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IPC IPC(8): C09K8/40
Inventor 赵德喜耿东士赵福祥王益山王野邓艳华宫延军
Owner CNPC BOHAI DRILLING ENG
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