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Efficient imbibition nonflowback fracturing fluid of dense oil reservoir and imbibition swallowing-spitting oil production method thereof

A technology for tight oil reservoirs and fracturing fluids, applied in chemical instruments and methods, production fluids, earthwork drilling and other directions, can solve the problems of loss of formation energy, increase the cost of waste liquid treatment measures, etc., and improve the degree of imbibition production , Solid phase residue reduction, good imbibition effect

Active Publication Date: 2018-11-06
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the current fracturing measures, the fracturing fluid is generally flowback as soon as possible, which not only loses formation energy, but also increases the cost of waste liquid treatment

Method used

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  • Efficient imbibition nonflowback fracturing fluid of dense oil reservoir and imbibition swallowing-spitting oil production method thereof
  • Efficient imbibition nonflowback fracturing fluid of dense oil reservoir and imbibition swallowing-spitting oil production method thereof
  • Efficient imbibition nonflowback fracturing fluid of dense oil reservoir and imbibition swallowing-spitting oil production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-efficiency imbibition non-flowback fracturing fluid for tight oil reservoirs, the fracturing fluid includes a base fluid and a cross-linking fluid, and the cross-linking ratio of the base fluid to the cross-linking fluid is 100:10; the base fluid is thickened by agent, penetration enhancer, clay stabilizer, bactericide, PH regulator and water; crosslinking liquid is composed of crosslinking agent, gel breaker, degradation agent and water.

[0033] The thickener in the base liquid is hydroxypropyl guar gum with low water insoluble matter, the concentration is 0.4wt%, the penetration enhancer is the mixture of cocamidopropyl betaine and OP-10, the concentration is 0.1wt%; clay Stabilizer is tetramethylammonium chloride, concentration 1wt%; Bactericide is glutaraldehyde, the concentration of bactericide 0.2wt%; With sodium carbonate, adjust base liquid pH to 8-9; Cocamidopropyl betaine and The mass ratio of cocamidopropyl betaine and OP-10 in the mixture of OP-10 is...

Embodiment 2

[0046] A high-efficiency imbibition non-flowback fracturing fluid for tight oil reservoirs, the fracturing fluid includes a base fluid and a cross-linking fluid, and the cross-linking ratio of the base fluid to the cross-linking fluid is 110:10; the base fluid is thickened by agent, penetration enhancer, clay stabilizer, bactericide, PH regulator and water; crosslinking liquid is composed of crosslinking agent, gel breaker, degradation agent and water.

[0047] The thickener in the base liquid is hydroxypropyl guar gum with low water insoluble matter, the concentration is 0.3wt%, the penetration enhancer is the mixture of cocamidopropyl betaine and OP-10, the concentration is 0.15wt%; clay Stabilizer is potassium chloride, concentration 1wt%; Bactericide is formaldehyde, the concentration of bactericide is 0.2wt%; Use sodium carbonate, adjust base fluid pH to 9; Coconut amidopropyl betaine and the mixture of OP-10 The mass ratio of oleamidopropyl betaine to OP-10 is 1:1.

[0...

Embodiment 3

[0056] A high-efficiency imbibition non-flowback fracturing fluid for tight oil reservoirs, the fracturing fluid includes a base fluid and a cross-linking fluid, and the cross-linking ratio of the base fluid to the cross-linking fluid is 90:10; the base fluid is thickened by agent, penetration enhancer, clay stabilizer, bactericide, PH regulator and water; crosslinking liquid is composed of crosslinking agent, gel breaker, degradation agent and water.

[0057] The thickener in the base liquid is hydroxypropyl guar gum with low water insoluble matter, the concentration is 0.3wt%, the penetration enhancer is the mixture of cocamidopropyl betaine and OP-10, the concentration is 0.12wt%; clay The stabilizer is potassium chloride, the concentration is 1wt%; the fungicide is glutaraldehyde, the concentration of the fungicide is 0.2wt%; sodium carbonate is used to adjust the pH of the base liquid to 8.5; the mixture of cocamidopropyl betaine and OP-10 The mass ratio of cocamidopropyl...

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Abstract

The invention relates to efficient imbibition nonflowback fracturing fluid of a dense oil reservoir and an imbibition swallowing-spitting oil production method thereof. The efficient imbibition nonflowback fracturing fluid is prepared from a base solution and a cross-linking solution of which a cross-linking ratio is (90 to 110):10, wherein the base solution is prepared from a thickening agent, apermeation enhancer, a clay stabilizer, a bactericide, a PH (Potential of Hydrogen) regulator and water; the cross-linking solution is prepared from a cross-linking agent, a gel breaker, a degradationagent and water. A fracturing fluid system has the advantages that gel breaking is complete, residue can be sufficiently degraded, the content of the residue after degrading for 10 hours is smaller than 180mg / L, the degradation rate is 70 percent, an imbibition effect is good, and the imbibition recovery efficiency of rock cores at different imbibition rates can be improved by 5 percent or above;imbibition swallowing-spitting oil production can be carried out by combining a corresponding using method, and the yield of crude oil can be effectively increased; by five months of current cumulative production and compared with direct flowback wells which are put into production at the same term, oil production per well is increased by about 2t / d.

Description

technical field [0001] The invention relates to a high-efficiency imbibition non-flowback fracturing fluid and an imbibition huff and puff oil recovery method for tight oil reservoirs, and belongs to the technical field of oil and gas development. Background technique [0002] With the increase of energy demand and the advancement of exploration and development technology, unconventional oil and gas resources such as tight oil reservoirs have become an important alternative energy source. Large-scale horizontal well staged volumetric fracturing is the main means of tight oil reservoir development. Due to the characteristics of large-scale reconstruction, large amount of fluid entering the ground, and high pressure of measures, while the fracturing fluid in the ground carries sand and creates fractures, the solid phase residue and concentrated gel filter cake in the gel-breaking fluid will also cause certain damage to the formation. harm. [0003] Tight oil reservoirs are of...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/605C09K8/685C09K8/885C09K8/90C09K2208/26E21B43/26
Inventor 黄飞飞蒲春生陆雷超姜璐谷潇雨张更刘静吴飞鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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