CN102134481B

CN102134481B - Carboxymethyl-hydroxypropyl guar gum water-base fracturing fluid

Info

Publication number: CN102134481B
Application number: CN 201110009659
Authority: CN
Inventors: 王贤君; 张玉广; 肖丹凤; 张明慧; 韩松; 裴涛
Original assignee: Daqing Oilfield Co Ltd
Current assignee: Daqing Oilfield Co Ltd
Priority date: 2011-01-18
Filing date: 2011-01-18
Publication date: 2013-05-22
Anticipated expiration: 2031-01-18
Also published as: CN102134481A

Abstract

The invention relates to carboxymethyl-hydroxypropyl guar gum water-base fracturing fluid having the advantages of low used concentration of a thickening agent and low cost aiming at development of low permeability reservoir. The fracturing fluid comprises base fluid and crosslinked fluid in a weight ratio of 50:1, wherein the base fluid consists of 0.18 to 0.25 percent of carboxymethyl-hydroxypropyl guar gum, 0.25 to 0.20 percent of wetting-resistant surfactant, 0.20 to 0.15 percent of emulsification-resistant demulsifier, 1.20 to 0.60 percent of expansion-resistant and migration-resistant treatment agent, 0.15 to 0.10 percent of bactericide, 0.08 to 0.05 percent of pH value regulator, 0.10 to 0.05 percent of organic silicon defoaming agent and the balance of water; and the crosslinked fluid consists of 9.0 to 6.0 percent of composite crosslinking agent, 0.2 to 0.1 percent of gel breaker and the balance of water. The using amount of the thickening agent and the residue content of the fracturing fluid are greatly reduced, the harm to the reservoir and proppant cracks can be reduced, and the effect of fracturing measures is improved.

Description

Carboxymethyl-hydroxypropyl guar gum water-base fracturing fluid

Technical field

The present invention relates to the oilfield chemistry Application Areas, is a kind of aqueous fracturing fluid of the low working concentration carboxy-methyl hydroxy propyl guanidine glue for low permeability reservoir exploitation.

Background technology

Daqing and pinnacle basin are the main REGION OF WATER INJECTION OILFIELD that will realize from now on oilfield stable production, wherein grape flower, hold up 7.72 hundred million tons of the untapped reserves of poplar low permeability pay, account for 91.5% of peripheral reserves.And the oil reservoir extra-low permeability causes that pressure break is high to the reservoir damage degree, measure effect is poor, and the reserves special low abundance yields poorly after causing individual well to be pressed, the measure cost is high, restricted the exploitation of low permeability reservoir economical and effective.The key that realizes the exploitation of low permeability reservoir economical and effective is to improve correctional effect, clearly restrict the principal contradiction of effect of increasing production, break through the limitation of measure effect and benefit, form the specific aim measure, reduction measure cost, form innovative technology, satisfy low permeability pay effective exploitation needs, the marginal oil field that makes conventional exploitation can't obtain benefit is effectively employed.See with regard to present technology and industrial application situation, well stimulation is not solved to the contradiction between the fracturing liquid performance requriements, this is that the requirement fracturing liquid should have necessary visco-elasticity and carries propping agent, rapid break and reduce the reservoir supporting crack infringement low cost of begging to surrender again particularly to contradiction, improves measure effect and benefit.Particularly in recent years, people drop to fracturing liquid focusing on of paying close attention to minimum to the infringement of reservoir gradually and obtain higher fracture flow capacity and low cost is come up.

Summary of the invention

In order to solve the deficiency that exists in background technology, the invention provides a kind of ultralow working concentration, carboxymethyl-hydroxypropyl guar gum water-base fracturing fluid cheaply, this fracturing liquid can improve the fracturing liquid performance effectively, guarantee the normal need of pressing crack construction, and have advantages of reservoir and the environmental protection of the low injury of fracture flow capacity high effect nontoxic.Have simultaneously low leak-off, low cost, easy-operating characteristics.

The technical solution adopted in the present invention is: this aqueous fracturing fluid, comprise base fluid and crosslinked fluid, and base fluid and crosslinked fluid are 50:1 by weight; Base fluid is by carboxy-methyl hydroxy propyl guanidine glue 0.18～0.25%, anti-wetting table agent C alive ₁₂H ₂₅SO ₃Na 0.20～0.25%, anti-emulsion emulsion splitter 0.15～0.20%, anti-swollen antimigration treatment agent 0.60～1.20%, sterilant 0.10～0.15%, pH value conditioning agent 0.05～0.08%, silicone antifoam agent 0.05～0.10% and excess water form; Crosslinked fluid is comprised of multiple crosslinking agent 6.0～9.0%, gel breaker 0.1～0.2% and excess water, and above-mentioned each component is proportioning by mass percentage, and wherein the pH value conditioning agent is by NaOH and Na ₂CO ₃Form by weight 4:1, gel breaker is by K ₂S ₂O ₈, and Na ₂S ₂O ₈Form by weight 3:2, multiple crosslinking agent is comprised of by weight 3:2 trolamine zirconium and zirconium lactate ammonium.

Thickening material carboxy-methyl hydroxy propyl guanidine glue (CMHPG) in such scheme-be a kind of anionic of guanidine glue and the dual derivative of non-ionic type, by the dual chemical modification, namely introduce hydrophilic radical sodium carboxymethyl and hydroxypropyl in the molecular structure of guanidine glue and make.Guanidine glue is through carboxymethylation and hydroxypropylation modification, and its water-insoluble reduces, and water-soluble speed is accelerated, and anticorrosion storge quality improves.The negatively charged ion of carboxy-methyl hydroxy propyl guanidine glue and nonionic dual structure make it have dual chemical character, and be when selecting linking agent and other additive, more various and flexible.Water insoluble matter content is lower by 67% than hydroxypropyl guar, and swelling rate is fast, and dissolution time is short, and exposure concentration C* is lower by 50% than hydroxypropyl guar, and thickening efficiency is higher, consumption is lower, broken glue load is less.Under the condition that polymer concentration greatly reduces, by preferred novel lactic zirconium crosslink agent, improve cross-linking density and cross-link intensity, synergy by other additive, its viscosity criterion does not reduce, and visco-elasticity is enough to guarantee that the low series formula to 30～120 ℃ of whole fracturing liquid can have good rheological property to guarantee to carry propping agent, its breaking glue solution injury also drops to minimum, compare residue with conventional fracturing liquid and reduce by 80%, comprehensive cost can reduce by 15～20%, and following fracturing liquid scheme 1 sees Table 1 with existing hydroxypropyl guar fracturing liquid performance comparison.

90 ℃ of different fracturing fluid system performance comparison tables 1 of formula

The present invention has following beneficial effect: due to the physical property complicated condition of low permeability pay, therefore strong for of the fracturing fluid susceptibility, Formation Damaged By Hydrofrac Fluid is large, effectively controls and reduces of the fracturing fluid injury, further improving the fracturing methods effect, is the key of LOW PERMEABILITY OILFIELD DEVELOPMENT.Adopt ultralow density carboxy-methyl hydroxy propyl guanidine gum fracturing fluid to reduce extent of injury to reservoir permeability and fracture flow capacity for above-mentioned situation the present invention, improve the fracturing methods effect.

Description of drawings:

Fig. 1 301-33-44 well n that revives ₂95,94 layers of construction curve;

Fig. 24 layers of construction curve of 301-50-54 well N1 I of reviving.

Embodiment:

Fracturing liquid scheme 1:

(1) will resist the agent 0.25% alive of wetting table, non-emulsifier 0.2%, anti-swollen antimigration treatment agent 1.2%, sterilant 0.15%, pH value conditioning agent 0.08%, defoamer 0.1% and excess water wiring solution-forming, and add thickening material 0.25% to be made into base fluid under the 2000r/min high-speed stirring.

(2) with multiple crosslinking agent 6.0%, gel breaker K ₂S ₂O ₈0.1% and excess water be made into crosslinked fluid.

(3) two groups of pump trucks of field by using are simultaneously with base fluid: crosslinked fluid pumps into fracture manifold by weight 50:1 and carries out pressing crack construction.

Fracturing liquid scheme 2:

(1) will resist the agent 0.2% alive of wetting table, non-emulsifier 0.15%, anti-swollen antimigration treatment agent 0.6%, sterilant 0.1%, pH value conditioning agent 0.05%, defoamer 0.05%, water wiring solution-forming, and add thickening material 0.18% to be made into base fluid under the 2000r/min high-speed stirring.

(2) linking agent 9.0%, gel breaker 0.2% and excess water are made into crosslinked fluid.

(3) two groups of pump trucks of field by using are simultaneously with base fluid: crosslinked fluid=50:1 pumps into fracture manifold and carries out pressing crack construction.

Above-mentioned each component is proportioning by mass percentage, and wherein the pH value conditioning agent is by NaOH and Na ₂CO ₃Form by weight 4:1, gel breaker is by K ₂S ₂O ₈, and Na ₂S ₂O ₈Form by weight 3:2, multiple crosslinking agent is comprised of by weight 3:2 trolamine zirconium and zirconium lactate ammonium.

With at Hailaer Oilfield Soviet Union 301 block application examples, uses 111 layers, 44 mouthfuls of wells of methyl hydroxypropyl guar fracturing liquid of the present invention (fracturing liquid scheme 1), be constructed into power 98.9%, on average sand than 21.6%, on average adds sand intensity 2.15m ³/ m, wherein 22 mouthfuls day at average individual well initial stage of oil well production fluid reach 5.61t/d, a day produce oil reaches 2.72t/d.

Effect of field application table table 2

100 ℃ of well analyses of typical case:

Take the Hailaer Basin, Northeast China Soviet Union 301 blocks 301-33-44 of Soviet Union wells as example, this well fractured layer position is n ₂95,94, depth of reservoirs is (2858.6 ~ 2849.4) m, and reservoir temperature is 103 ℃, uses 100 ℃ of carboxy-methyl hydroxy propyl guanidine gum fracturing fluid formulas (fracturing liquid scheme 1) and carries out pressure break, and carboxymethyl guanidine gum fracturing fluid consumption is 255m ³, reality adds haydite 30m altogether ³, engineering time 117min, carboxy-methyl hydroxy propyl guanidine glue thickening material consumption is 637.5kg, is 1402.5kg as adopting the hydroxypropyl guar consumption, this well is saved thickening material 54.5%, average operation pressure: 43Mpa, operational discharge capacity: 3.5 m ³/ min, high sand ratio: 39%, average sand ratio: 24.5%, the termination of pumping pressure gradient: 0.0165 MPa/m, just common Fig. 1 constructs.

70 ℃ of well analyses of typical case:

Revive the 301 blocks 301-50-54 of Soviet Union wells as example take Hailaer Basin, Northeast China, this well fractured layer position is N1 I 4, depth of reservoirs is (1992.2 ~ 2017.0) m, reservoir temperature is 72 ℃, use 70 ℃ of carboxy-methyl hydroxy propyl guanidine gum fracturing fluid formulas (fracturing liquid scheme 2) and carry out pressure break, carboxy-methyl hydroxy propyl guanidine gum fracturing fluid consumption is 200m ³, reality adds haydite 24m altogether ³, engineering time 87min, carboxy-methyl hydroxy propyl guanidine glue thickening material consumption is 360.0kg, is 800.0kg as adopting the hydroxypropyl guar consumption, this well is saved thickening material 55.0%, average operation pressure: 41.5Mpa, operational discharge capacity: 3.5 m ³/ min, high sand ratio: 34%, average sand ratio: 20.5%, the termination of pumping pressure gradient: 0.0206 MPa/m, just common Fig. 2 constructs.

In above-described embodiment, thickening material carboxy-methyl hydroxy propyl guanidine glue CMHPG is available from Kunshan company of CNPC; Anti-emulsion emulsion splitter TR-2031 is available from grand celebration Wan Tong Chemical Industry Science Co., Ltd; Anti-swollen antimigration treatment agent A69-1 is available from grand celebration diversified economy industrial corporation with fair wind; Sterilant SJ-112 is available from Dalian Yin Feng Chemical Industry Science Co., Ltd; Silicone antifoam agent LRX-2 is available from the Shandong sincere Chemical Industry Science Co., Ltd of Binzhou sunlight.

The trolamine zirconium:

The zirconium lactate ammonium:

Claims

1. an aqueous fracturing fluid, comprise base fluid and crosslinked fluid, and base fluid and crosslinked fluid are 50:1 by weight; Base fluid is by carboxy-methyl hydroxy propyl guanidine glue 0.18～0.25%, anti-wetting table agent C alive ₁₂H ₂₅SO ₃Na 0.20～0.25%, anti-emulsion emulsion splitter 0.15～0.20%, anti-swollen antimigration treatment agent 0.60～1.20%, sterilant 0.10～0.15%, pH value conditioning agent 0.05～0.08%, silicone antifoam agent 0.05～0.10% and excess water form; Crosslinked fluid is comprised of multiple crosslinking agent 6.0～9.0%, gel breaker 0.1～0.2% and excess water, and above-mentioned each component is proportioning by mass percentage, and wherein pH value conditioning agent is by NaOH and Na ₂CO ₃Form by weight 4:1, gel breaker is by K ₂S ₂O ₈, and Na ₂S ₂O ₈Form by weight 3:2, multiple crosslinking agent is comprised of by weight 3:2 trolamine zirconium and zirconium lactate ammonium.