High-temperature hyper-salinity water-base fracturing fluid

A high-salinity, water-based fracturing technology, applied in the field of high-temperature fracturing fluid, can solve the problems of complex preparation process and high cost, and achieve the effect of convenient fluid preparation process and delayed cross-linking time

Active Publication Date: 2014-01-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of using surfactants abroad is high, and it is not suitable for the development of high-temperature and low-permeability oil and gas fields. Domestic published patents and documents use a variety of additives, making the preparation process complicated and costly.

Method used

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  • High-temperature hyper-salinity water-base fracturing fluid
  • High-temperature hyper-salinity water-base fracturing fluid
  • High-temperature hyper-salinity water-base fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 9939kg of seawater to the liquid mixing tank, slowly add 40kg of sulfonic acid hydroxypropyl guar gum, add 10kg of sodium thiosulfate and 1kg of glutaraldehyde after circulating for 10 minutes, and finally add 10kg of dodecyltrimethylammonium bromide , and recirculate for 10 minutes to obtain a uniform and transparent viscosified liquid. The viscosity measured by a six-speed rotational viscometer was 57 mPa·s, and the pH was 8.2.

[0023] Take 1000g of the prepared thickened liquid, add 2g of cross-linking agent under rapid stirring, and continue stirring for 8 minutes to obtain a pickable jelly. The rheological properties of the jelly were tested at 140°C using a RS6000 rheometer (see figure 1 ).

[0024] Add 1 g of ammonium persulfate to 1000 g of the jelly prepared in the previous step, and place it in a water bath at 80°C for 2 hours to fully hydrate the jelly.

Embodiment 2

[0026] Add 9902kg of formation produced water into the liquid mixing tank, slowly add 50kg of sulfobetaine amphoteric guar gum, add 15kg of sodium thiosulfate and 3kg of formaldehyde after circulating for 10 minutes, and finally add 30kg of hexadecyl trimethyl bromide ammonium, and recirculate for 10 minutes to obtain a uniform and transparent thickened liquid. The viscosity measured by a six-speed rotational viscometer was 66 mPa·s, and the pH was 8.5.

[0027] Take 1000g of the prepared thickened solution, add 4g of cross-linking agent under rapid stirring, and continue stirring for 7 minutes to obtain a pickable jelly. The rheological properties of the jelly were tested at 150°C using a RS6000 rheometer (see figure 2 ).

[0028] Add 1,000 g of the jelly prepared in the previous step, add 5 g of ammonium persulfate under stirring, and place it in a water bath at 80°C for 3 hours. The jelly is completely hydrated. After hydration, the viscosity of the liquid measured by a ...

Embodiment 3

[0030] Add 9864kg seawater in the liquid mixing tank, slowly add 60kg carboxymethyl guar gum sulfonate, add 20kg sodium thiosulfate and 6kg glutaraldehyde after circulating for 10 minutes, and finally add 50kg cetyltrimethylammonium bromide, Recirculate for 10 minutes to obtain a uniform and transparent thickened liquid. The viscosity measured by a six-speed rotational viscometer was 78 mPa·s, and the pH was 8.7.

[0031] Take 1000g of the prepared thickened solution, add 6g of cross-linking agent under rapid stirring, and continue stirring for 5 minutes to obtain a pickable jelly. The rheological properties of the jelly were tested at 160°C using a RS6000 rheometer (see image 3 ).

[0032] Add 10 g of ammonium persulfate to 1000 g of the jelly prepared in the previous step, and place it in a water bath at 80°C for 3 hours to fully hydrate the jelly.

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Abstract

The invention discloses high-temperature hyper-salinity water-base fracturing fluid consisting of thickening liquid, a cross-linking agent and a gel breaker, wherein the thickening liquid comprises the following components in percentage by weight: 0.4-0.7% of a thickening agent, 0.1-0.8% of a cleanup additive, 0.01-0.1% of a sterilizing agent, 0.1-0.3% of a temperature stabilizing agent, and the balance of hyper-salinity seawater or stratum produced water; the thickening agent is sulfonyl hydroxypropyl guar gum, sulfonyl betaine amphoteric guar gum or sulfonyl carboxymethyl guar gum; the cross-linking agent is a stable complex formed from reaction of 9-18% of a zirconium compound, 3-40% of a boron compound, 9-18% of a chelating ligand and 5-19% of a bridging ligand by mass; the gel breaker is either ammonium persulfate or sodium persulfate. The fracturing fluid is directly prepared from hyper-salinity water and realizes effective utilization of seawater and hyper-salinity produced water from land, and is applicable to seaborne and terrestrial high-temperature oil-gas wells.

Description

technical field [0001] The invention relates to a high-temperature fracturing fluid that can be prepared by using high-salinity water in the field of oil and gas field development and production increase. Background technique [0002] Hydraulic fracturing is one of the important measures to stimulate low-permeability reservoirs, and is widely used in onshore oil and gas fields. Boron cross-linked fracturing fluid is widely used in fracturing construction. On land, boron cross-linked fracturing fluid is prepared from fresh water and other additives. At present, offshore fracturing construction is also carried out according to the process on land, and it is transported from land first. The sea water goes to the offshore platform, and the fracturing fluid is prepared on the platform, and then construction is carried out. This puts forward very high requirements on the logistics at sea, and the cost has been greatly increased. Oilfields on land have high-salinity produced wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/665C09K8/685C09K8/887C09K8/90C09K2208/26
Inventor 郭建春王世彬唐洪彪何乐赖杰王恒赵金洲
Owner SOUTHWEST PETROLEUM UNIV
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