Preparation method of polymer shale inhibitor for drilling fluid

A technology of shale inhibitors and polymers, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem that the anti-slump inhibition mechanism is rare, affects the application effect of other treatment agents, and destroys drilling fluid contact. Denaturation and other issues, to achieve the effects of easy access, enhanced stability, and good adsorption performance

Active Publication Date: 2017-12-19
DAQING BEIHUA CHEM PLANT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to inhibit the hydration expansion of clay, the traditional method is to add potassium chloride, sodium chloride or divalent salts to the drilling fluid. loss, and affect the application effect of other treatment agents
[0003] Zwitterionic polyacrylamide emulsion is a kind of treatment agent for oil drilling industry that has developed rapidly in China in recent years. It can be used as oil field sewage treatment agent, thickener for oil field fracturing, oil displacement agent for tertiary oil recovery, etc. The molecular weight distribution is uniform and the dissolution speed is fast to form a uniform glue. It is effective in drilling and easy to use. However, there are few reports on improving the inhibition of drilling fluids, and most of them are still in the laboratory research stage. For its anti-slump There are very few studies on the mechanism of inhibition

Method used

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  • Preparation method of polymer shale inhibitor for drilling fluid
  • Preparation method of polymer shale inhibitor for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Mix 75 parts of acrylic acid with the same number of potassium hydroxide and stir evenly, add 75 parts of acrylamide and 25 parts of dimethyl diallyl ammonium chloride to prepare a mixed aqueous phase with a pH of 10, add 10 parts by weight Parts of emulsifier Sp-80, 100 parts by weight of white oil of T-60 were slowly added to the mixed water phase and stirred in a shear emulsification mixer at a shear speed of 500r / min for 1h to emulsify and disperse to form a water-in-oil emulsion. Transfer the emulsion into a reaction kettle, add 7 parts by weight of nano-stabilizer while stirring, then fill with nitrogen, and heat up. press n 过硫酸钠 :n 亚硫酸氢钠 =1:1 Weigh 0.4 parts by mass of the initiator to make a solution, slowly and alternately add it to the reactor, stir slowly at 100r / min for 5h, when the viscosity of the emulsion in the reactor reaches 650cp or more, discharge and cool to obtain polymer shale Inhibitors.

[0012] Above-mentioned stabilizer preparation method i...

Embodiment 2

[0017] Mix 70 parts of acrylic acid with the same number of potassium hydroxide and stir evenly, add 70 parts of acrylamide and 35 parts of dimethyl diallyl ammonium chloride to prepare a mixed aqueous phase with a pH of 10, add 10 parts by weight Parts of emulsifier Sp-80, 100 parts by weight of white oil of T-60 were slowly added to the mixed water phase and stirred in a shear emulsification mixer at a shear speed of 500r / min for 1h to emulsify and disperse to form a water-in-oil emulsion. Transfer the emulsion into a reaction kettle, add 8 parts by weight of a stabilizer while stirring, then fill with nitrogen, and heat up. press n 过硫酸钠 :n 亚硫酸氢钠 =1:1 Weigh 0.4 parts by mass of the initiator to make a solution, slowly and alternately add it to the reactor, stir slowly at 100r / min for 5h, when the viscosity of the emulsion in the reactor reaches 650cp or more, discharge and cool to obtain polymer shale Inhibitors.

Embodiment 3

[0019] Mix 80 parts of acrylic acid with the same number of potassium hydroxide and stir evenly, add 80 parts of acrylamide and 20 parts of dimethyl diallyl ammonium chloride to prepare a mixed aqueous phase with a pH of 10, add 10 parts by weight Parts of emulsifier Sp-80, 100 parts by weight of white oil of T-60 were slowly added to the mixed water phase and stirred in a shear emulsification mixer at a shear speed of 500r / min for 1h to emulsify and disperse to form a water-in-oil emulsion. Transfer the emulsion into a reaction kettle, add 9 parts by weight of a stabilizer while stirring, then fill with nitrogen, and heat up. press n 过硫酸钠 :n 亚硫酸氢钠 =1:1 Weigh 0.4 parts by mass of the initiator to form a solution, slowly and alternately add it to the reactor, stir slowly at 100r / min for 5h, when the viscosity of the emulsion in the reactor reaches 650cp or more, discharge and cool to obtain polymer shale Inhibitors.

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Abstract

The invention discloses a preparation method of a polymer shale inhibitor for a drilling fluid. The polymer shale inhibitor is prepared from acrylamide, acrylic acid, potassium hydroxide and dimethyldiallylammonium chloride through an inverse emulsion polymerization technology, and optimum synthesis conditions are as follows: a weight part ratio of the acrylamide monomer to the acrylic acid monomer to the dimethyldiallylammonium chloride monomer is (70-80):(70-80):(15-75), the three monomers are processed to prepare an aqueous phase with the pH value being 10, 10 parts by weight of emulsifiers Sp-80 and T-60 are added to emulsify and disperse the aqueous phase in 100 parts by weight of white oil, and 1-3 parts of a stabilizer N,N'-dilauroyl ethylenediamine diethanesulfonate, the reaction temperature is 30-40 DEG C, the reaction time is 8 h, an oxidation/reduction initiator ratio of n(potassium persulfate):n(sodium hydrogen sulfite) is 1:1, and the weight part number of the initiator is 4. The product can be adsorbed on the surface of clay to form a semi-permeable membrane, has a strong coating effect, can effectively encase rock debris to weaken the hydration and dispersion effect, can compress a double electrode layer to prevent the hydration swelling of the clay, and has a prominent inhibition effect.

Description

technical field [0001] The invention relates to the field of preparation of polymer shale inhibitors for drilling fluid, and relates to a preparation method of a ternary polymer. Background technique [0002] During the drilling process, when drilling into a highly water-sensitive formation, the drilling fluid invades the shale layer, which will cause the shale to hydrate and expand, causing many downhole problems. In order to inhibit the hydration expansion of clay, the traditional method is to add potassium chloride, sodium chloride or divalent salt to the drilling fluid. loss, and affect the application effect of other treatment agents. [0003] Zwitterionic polyacrylamide emulsion is a kind of treatment agent for oil drilling industry that has developed rapidly in China in recent years. It can be used as oil field sewage treatment agent, thickener for oil field fracturing, oil displacement agent for tertiary oil recovery, etc. The molecular weight distribution is unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F226/02C09K8/035
CPCC08F220/06C08F220/56C09K8/035C09K2208/34C08F226/02
Inventor 邵亚
Owner DAQING BEIHUA CHEM PLANT
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