Self-association fracturing fluid system with water control function and preparation method thereof

A technology of self-association and fracturing fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve problems such as oil production reduction

Inactive Publication Date: 2017-06-23
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing fracturing fluid systems mainly include guar gum fracturing fluid, slick water fracturing fluid, VES clean fracturing fluid, anionic polymer fracturing fluid, and associative polymer fracturing fluid; The seepage channel formed after the formation is opened is not only a channel for oil and gas flow, but also a channel for formation water; however, the production of formation water will inevitably lead to a decrease in oil production. Therefore, it is necessary to develop a fracturing fluid system with water control function, so While increasing oil and gas production after fracturing, it can prevent the production of formation water, that is, while increasing oil and gas production after fracturing, it can also effectively control and prevent the production of formation water

Method used

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  • Self-association fracturing fluid system with water control function and preparation method thereof
  • Self-association fracturing fluid system with water control function and preparation method thereof
  • Self-association fracturing fluid system with water control function and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take by weighing 20gDMDAAC (purity is 65%) and 20gDMC (purity is 78%) and join in the deionized water of 60g successively, stir and mix evenly, obtain mixed reaction solution; Continue to add the persulfuric acid of each 0.02g in the mixed reaction solution under room temperature Ammonium and sodium bisulfite were reacted for 30 minutes under the protection of a nitrogen atmosphere, and finally a white colloid was obtained, which was dried and crushed at 65-70°C, which was a cationic polymer; the average molecular weight of the cationic polymer was 1.5 million;

[0029] When using on-site, add 0.4g cationic polymer to every 100ml of water, then add 0.3g dodecylbenzenesulfonic acid, stir for 2 minutes to form a jelly, the viscosity of the jelly is 236mPa.S; continue to add 0.05g over Ammonium sulfate, mixed evenly, can obtain a self-associated fracturing fluid system with water control function.

[0030] The fracturing fluid system prepared in Example 1 was subjected to ...

Embodiment 2

[0034] Take by weighing 20gDMDAAC (purity is 65%) and 20gDMC (purity is 78%) and join in the deionized water of 60g successively, stir and mix evenly, obtain mixed reaction solution; Continue to add the persulfuric acid of each 0.02g in the mixed reaction solution under room temperature Ammonium, sodium bisulfite and 4g of ammonium bicarbonate were reacted for 30 minutes under the protection of a nitrogen atmosphere, and finally a white colloid was obtained, which was dried and pulverized at 65-70 ° C, which was a cationic polymer; the cationic polymer The average molecular weight is 2 million;

[0035]When using on-site, add 0.4g cationic polymer to every 100ml of water, then add 0.3g dodecylbenzenesulfonic acid, stir for 2 minutes to form a jelly, the viscosity of the jelly is 240mPa.S; continue to add 0.05g over Ammonium sulfate, mixed evenly, can obtain a self-associated fracturing fluid system with water control function.

[0036] The fracturing fluid system prepared in ...

Embodiment 3

[0040] Take by weighing 15gDMDAAC (purity is 65%) and 15gDMC (purity is 78%) and join in the deionized water of 70g successively, stir and mix uniformly, obtain mixed reaction solution; Continue to add each 0.01g persulfuric acid in mixed reaction solution under room temperature Ammonium, sodium bisulfite and 4g of ammonium bicarbonate were reacted for 30 minutes under the protection of a nitrogen atmosphere, and finally a white colloid was obtained, which was dried and pulverized at 65-70 ° C, which was a cationic polymer; the cationic polymer The average molecular weight is 2.6 million;

[0041] When using on-site, add 0.4g cationic polymer to every 100ml of water, then add 0.3g dodecylbenzenesulfonic acid, stir for 2 minutes to form a gel, and the viscosity of the gel is 250mPa.S; continue to add 0.05g over Ammonium sulfate, mixed evenly, can obtain a self-associated fracturing fluid system with water control function.

[0042] The fracturing fluid system prepared in Examp...

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Abstract

The invention discloses a self-association fracturing fluid system with a water control function and a preparation method thereof. According to the self-association fracturing fluid system, a cationic polymer is adopted as a thickening agent, an anionic surfactant is adopted as a cross-linking agent, after a cross-linking system of the cationic polymer and the anionic surfactant acts with a corresponding gel breaker, a macromolecular chain segment of the cationic polymer is broken, and is changed from a high molecule to a small molecule, and a small-molecule cationic polymer solution with a certain concentration is formed; such a small-molecule cationic polymer solution can generate strong adsorption in a stratum, thus, the wettability of the stratum is changed, the rock surface of the stratum is changed to have a highly hydrophilic nature, and the attachment energy and the flow resistance of water are increased, and water controlling and water lowering effects are achieved; the preparation method of the self-association fracturing fluid system is simple, is mild in reaction condition, is convenient to operate, and is easy for industrialized production.

Description

technical field [0001] The invention relates to the technical field of oil and gas well fracturing reconstruction operations, in particular to a self-associated fracturing fluid system with water control function and a preparation method thereof. Background technique [0002] Fracturing is an oil well stimulation measure in the oil field. The high-viscosity fluid fracturing fluid system is used to open the formation to form fractures and carry proppant into the formation fractures. After construction, the proppant remains in the fractures and prevents the fractures from closing, thus forming a high-pressure line in the formation. Diversion channels to increase yield. [0003] The existing fracturing fluid systems mainly include guar gum fracturing fluid, slick water fracturing fluid, VES clean fracturing fluid, anionic polymer fracturing fluid, and associative polymer fracturing fluid; The seepage channel formed after the formation is opened is not only a channel for oil an...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/604C09K8/887C09K2208/12C09K2208/22
Inventor 王中泽徐克彬任孝柯陈清孙海林白田增曾昊杨煜王航穆海林刘汉强张鹏瞿红霞江新民徐昊洋杜鑫芳陈天昊郑立军高秀君夏克文
Owner CNPC BOHAI DRILLING ENG
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