CN103160270A - Encapsulated gel breaker for hydraulic fracturing of coalbed methane well, as well as preparation and using methods thereof - Google Patents
Encapsulated gel breaker for hydraulic fracturing of coalbed methane well, as well as preparation and using methods thereof Download PDFInfo
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- CN103160270A CN103160270A CN2013100853550A CN201310085355A CN103160270A CN 103160270 A CN103160270 A CN 103160270A CN 2013100853550 A CN2013100853550 A CN 2013100853550A CN 201310085355 A CN201310085355 A CN 201310085355A CN 103160270 A CN103160270 A CN 103160270A
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Abstract
The invention discloses an encapsulated gel breaker for hydraulic fracturing of a coalbed methane well, as well as preparation and using methods thereof. The encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises a gel breaker constituted by nonylphenol polyoxyethylene ether and a capsule wrapping the gel breaker, wherein the capsule is made of polylactic acid. The preparation method of the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises the following steps: preparing the gel breaker, namely nonylphenol polyoxyethylene ether into particles; and atomizing a wrapping material, namely polylactic acid, and enabling polylactic acid to meet with the gel breaker in hot air to form the capsule wrapping on the surface of the gel breaker. The using method of the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well comprises the following steps: adding the encapsulated gel breaker and a fracturing proppant into a clean fracturing solution together, and then performing fracturing construction by using the clean fracturing solution. The invention provides the encapsulated gel breaker for hydraulic fracturing of the coalbed methane well, which can be matched with the clean fracturing solution containing an organic sodium salt and a cationic surfactant and get good effects, as well as the preparation and the using methods thereof.
Description
Technical field
The present invention relates to the CBM exploration and development field, particularly a kind of coal bed gas well waterfrac treatment is with gel breaker and preparation and application thereof.
Background technology
Coalbed methane reservoir has low hole, hypotonic characteristics, generally needs fracturing reform could obtain gas output preferably.Pressure break refers to utilize fracturing truck under the high-pressure large-displacement condition, the liquid with certain viscosity to be clamp-oned the stratum, after the stratum is extruded the crack, adds fracturing propping agents (as quartz sand etc.) filling crack, improves the penetrating power of reservoir, to increase output.Need to use the clean fracturing fluid with certain viscosity to carry fracturing propping agents in construction process and enter the stratum, this process is for taking the sand process.And clean fracturing fluid must be able to break glue and becomes low-viscosity (mobile) liquid after taking the sand process and completing, and controlledly returns and discharges the stratum, could reduce the injury of constructing to the stratum.In general well fracturing process, clean fracturing fluid is met water, crude oil and Sweet natural gas can break glue voluntarily, does not need to add gel breaker.And few due to local water, free gas in coal bed gas well, clean fracturing fluid is difficult to broken glue voluntarily, therefore must add gel breaker break glue, just can make the clean fracturing fluid row of returning smoothly, the injury of minimizing to the coal seam.Just for make gel breaker clean fracturing fluid complete take the sand effect after the broken glue effect of performance, prior art generally adopts capsule breaker.Taking the sand stage, the capsule of capsule breaker has intercepted contacting of clean fracturing fluid and gel breaker, complete take sand after, destroy capsule, gel breaker contact with clean fracturing fluid, brings into play and breaks the glue function.Pressing crack construction to the requirement of capsule breaker is, the capsule of capsule breaker can fully be delayed breaking the glue time, guarantees that clean fracturing fluid completes the sand effect of taking; After taking the sand process and completing, capsule can be destroyed, and gel breaker is contacted with clean fracturing fluid.The gel breaker of capsule breaker should react with clean fracturing fluid, makes clean fracturing fluid break glue.Thereby reduce the viscosity of clean fracturing fluid, make it discharge smoothly the stratum.
in prior art, in Chinese patent application, application number provides a kind of low-cost water-based clean fracturing liquid for the technical scheme of 200910208522.X, this clean fracturing fluid is by the small cation expansion-resisting agent, Organic Sodium Salt, cats product and water consist of, in clean fracturing fluid the concentration of small cation expansion-resisting agent be 0.4 quality %(in this application, quality % represents mass percent concentration), the concentration of Organic Sodium Salt be 0.06-0.18 quality %(in this application, quality % represents mass percent concentration), the concentration of cats product be 0.2-0.6 quality %(in this application, quality % represents mass percent concentration), the cats product that uses: the mass ratio=1:0.3 of Organic Sodium Salt, described Organic Sodium Salt is sodium salicylate, described cats product is the mixture of any or they in 16～octadecyl trimethyl ammonium chloride.In this application, be that clean fracturing fluid in the patent document of 200910208522.X is called Organic Sodium Salt and cats product clean fracturing fluid with application number in this Chinese patent application.But there is no capsule breaker a kind of and this Organic Sodium Salt and cats product clean fracturing fluid no-float in prior art.
Summary of the invention
The invention provides a kind of novel coal bed gas well waterfrac treatment capsule breaker and preparation and application thereof, make it to coordinate with Organic Sodium Salt and the cats product clean fracturing fluid of prior art, obtain good taking sand and break the glue effect, reduce pressure break to the injury on stratum, increase the effect of pressure break.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of coal bed gas well waterfrac treatment capsule breaker, comprising:
The capsule of the gel breaker that union base phenol polyethenoxy ether consists of and the described gel breaker of parcel made by poly(lactic acid).
In the present invention, the gel breaker of described union base phenol polyethenoxy ether formation is particulate state.
In the present invention, (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to the diameter of the particulate state gel breaker of described union base phenol polyethenoxy ether formation in 2-3 millimeter scope.）。
In the present invention, (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to the diameter of described capsule breaker in 3-5 millimeter scope.）。
The invention also discloses a kind of coal bed gas well waterfrac treatment preparation method of capsule breaker, the method comprises: with gel breaker polyoxyethylene nonylphenol ether granulation shape; The lapping poly(lactic acid) atomized and it is met with gel breaker in warm air, forming the capsule that is wrapped in the gel breaker surface.
In the method, can further comprise after with gel breaker polyoxyethylene nonylphenol ether granulation shape: the granular gel breaker that will make sieves, (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to obtain the particulate state gel breaker of diameter in 2-3 millimeter scope.); The lapping poly(lactic acid) is atomized and make its in warm air with sieve after gel breaker meet, form the capsule be wrapped in the gel breaker surface.
In the method, also can comprise after forming in the lapping poly(lactic acid) capsule that is wrapped in the gel breaker surface: sieve after the capsule breaker of making is cooling, (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to obtain the capsule breaker of diameter in 3-5 millimeter scope.）。
The invention also discloses the described coal bed gas well waterfrac treatment using method of capsule breaker, the method comprises: described capsule breaker is joined in clean fracturing fluid together with fracturing propping agents, then carry out pressing crack construction with this clean fracturing fluid.
In this using method, after joining in clean fracturing fluid described capsule breaker together with fracturing propping agents, the concentration of capsule breaker in clean fracturing fluid is in milliliter-0.2 gram/100 milliliter scope of 0.1 gram/100.
In this using method, described clean fracturing fluid is Organic Sodium Salt and cats product clean fracturing fluid
By as seen above-mentioned, of the present invention comprising the " capsule of the gel breaker that union base phenol polyethenoxy ether consists of and the described gel breaker of parcel made by poly(lactic acid)." capsule breaker and comprise " with gel breaker polyoxyethylene nonylphenol ether granulation shape; The lapping poly(lactic acid) atomized and it is met with gel breaker in warm air, forming the capsule that is wrapped in the gel breaker surface." described capsule breaker the preparation method and comprise and " described capsule breaker joined in clean fracturing fluid together with fracturing propping agents, then carry out pressing crack construction with this clean fracturing fluid." the using method of described capsule breaker a kind of new capsule breaker and preparation and application thereof are provided.Make it to coordinate with Organic Sodium Salt and cats product clean fracturing fluid, obtain good taking sand and break the glue effect, reduce pressure break to the injury on stratum, increase the effect of pressure break.
Description of drawings
Fig. 1 is coal bed gas well waterfrac treatment provided by the invention with the broken glue effect schematic diagram of capsule breaker to Organic Sodium Salt and cats product clean fracturing fluid;
Fig. 2 is for making capsule material parcel gel breaker process schematic diagram of the present invention with the Wurster fluidized bed process;
Fig. 3 is coal bed gas well waterfrac treatment capsule breaker provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Coal bed gas well waterfrac treatment of the present invention comprises with capsule breaker gel breaker that union base phenol polyethenoxy ether consists of and the capsule of the described gel breaker of parcel made by poly(lactic acid).Capsule breaker of the present invention is white granular.
The gel breaker polyoxyethylene nonylphenol ether is a kind of white solid nonionogenic tenside.Reach at parcel capsule on gel breaker for convenience of the later stage and use in fracturing process, should be made into particulate state.Generally (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to the diameter of particle in 2-3 millimeter scope.), the sieve of granular polyoxyethylene nonylphenol ether by certain pore size can be screened, thereby obtain the more uniform gel breaker of granular size.After making qualified gel breaker, wrap up in the appearance of gel breaker the capsule that one deck lapping is made into, thereby finally form capsule breaker, the lapping that uses is poly(lactic acid).Obtain the capsule breaker of even particle size as need, the capsule breaker of making can be passed through the sieve screening of certain pore size.(due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to the capsule breaker diameter that is made generally in 3-5 millimeter scope.）。When pressure break was used, capsule had stoped contacting of gel breaker and clean fracturing fluid.Only have after the complete capsule shell of water dissolution, gel breaker just can react with clean fracturing fluid, makes clean fracturing fluid break glue, thereby reduces its viscosity, makes it discharge smoothly the stratum.Because the dissolving of capsule in clean fracturing fluid of capsule breaker needs for some time (whole dissolution process needs are more than 30 minutes), guaranteed that clean fracturing fluid is completed to take after the sand function just that broken glue returns row.This makes clean fracturing fluid keep viscosity higher before broken glue, fracturing propping agents is carried enter the crack smoothly, plays the effect of supporting crack, prevents the crack closure that pressure break forms.Complete take sand after, capsule breaker makes clean fracturing fluid break glue, reduces its viscosity, discharges the stratum thereby clean fracturing fluid is returned than more smoothly.Because clean fracturing fluid is residual few in the stratum, has reduced the obstruction of layer gap over the ground, thereby improved fracturing effect.
in prior art, in Chinese patent application, application number is Organic Sodium Salt and cats product clean fracturing fluid for the technical scheme of 200910208522.X provides a kind of low-cost water-based clean fracturing liquid, this clean fracturing fluid is by the small cation expansion-resisting agent, Organic Sodium Salt, cats product and water consist of, in clean fracturing fluid the concentration of small cation expansion-resisting agent be 0.4 quality %(in this application, quality % represents mass percent concentration), the concentration of Organic Sodium Salt be 0.06-0.18 quality %(in this application, quality % represents mass percent concentration), the concentration of cats product be 0.2-0.6 quality %(in this application, quality % represents mass percent concentration), the cats product that uses: the mass ratio=1:0.3 of Organic Sodium Salt, described Organic Sodium Salt is sodium salicylate, described cats product is the mixture of any or they in 16～octadecyl trimethyl ammonium chloride.
In R﹠D process of the present invention, coal bed gas well waterfrac treatment provided by the invention is tested with the matching of capsule breaker and Organic Sodium Salt and cats product clean fracturing fluid.
Testing clean fracturing fluid used is: adopt the linking agent (sodium salicylate) of the solidifying agent of master (a kind of in 16～octadecyl trimethyl ammonium chloride or their mixture) of 0.4% quality+0.12% quality to be mixed with the clean fracturing fluid that viscosity is 15mPas.Because the effect of small cation expansion-resisting agent is clay water-swellable and the migration that prevents in reservoir, there is no need in ground experiment to join in clean fracturing fluid, so the clean fracturing fluid of this experiment does not add the small cation expansion-resisting agent in above-mentioned Organic Sodium Salt and cats product clean fracturing fluid.
Experiment condition: in order to simulate more realistically the pressure break situation, the experimental temperature that this experiment is chosen is 30 ℃, and the temperature of this temperature and coalbed methane reservoir approaches.Namely add capsule breaker under 30 ℃, and measure the clean fracturing fluid viscosity over time under agitation condition.
Experimental result as shown in Figure 1, Fig. 1 for for coal bed gas well waterfrac treatment provided by the invention with the broken glue effect schematic diagram of capsule breaker to Organic Sodium Salt and cats product clean fracturing fluid.As can be seen from Figure 1, coal bed gas well waterfrac treatment of the present invention begins brokenly glue with capsule breaker is probably when adding rear 30 minutes, and the viscosity drop of final clean fracturing fluid is to 2mPas.According to the regulation of 4.4 Surfactant Used in Viscoelastic Fracturing Fluids fracturing liquid current techique indexs in the oil and gas industry standard SY/T6376-2008 of the People's Republic of China (PRC), the gel breaker apparent viscosity can be thought broken glue less than 5mPa.s.Experimental result explanation coal bed gas well waterfrac treatment provided by the invention can thoroughly be broken glue to this clean fracturing fluid with capsule breaker.
Therefore, coal bed gas well waterfrac treatment provided by the invention is used in conjunction with capsule breaker and Organic Sodium Salt and cats product clean fracturing fluid, and is respond well.
Below in conjunction with accompanying drawing, the preparation method of coal bed gas well waterfrac treatment provided by the invention with capsule breaker is described in further detail.
Coal bed gas well waterfrac treatment provided by the invention comprises with the preparation method of capsule breaker: with gel breaker polyoxyethylene nonylphenol ether granulation shape; The lapping poly(lactic acid) atomized and it is met with gel breaker in warm air (warm air of the present invention refers to the air of temperature in 30-40 degree centigrade of scope), forming the capsule that is wrapped in the gel breaker surface.
The gel breaker polyoxyethylene nonylphenol ether is a kind of white solid nonionogenic tenside.Reach at parcel capsule on gel breaker for convenience of the later stage and use in fracturing process, should be made into particulate state.In order to obtain the more uniform gel breaker of granular size, the granular polyoxyethylene nonylphenol ether of making can be passed through the sieve screening of certain pore size, thereby (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to obtain the particulate state gel breaker of diameter in 2-3 millimeter scope.）。
Fig. 2 is for making capsule material parcel gel breaker process schematic diagram of the present invention with the Wurster fluidized bed process.As shown in Figure 2, warm air (warm air of the present invention refers to the air of temperature in 30-40 degree centigrade of scope) enters by bottom air grid distributor 203, guide pipe 201 by equipment central authorities, force gel breaker particle 204 upwards motion in guide pipe 201, suddenly increase at guide pipe 201 exit gas channel sectional areas, air velocity reduces suddenly, and gel breaker particle 204 drop to the bottom from annular space, be subject to the impact of gravity and Venturi effect, enter again guide pipe 201.Gel breaker particle 204 is circulation so regularly in equipment.Meanwhile, with the atomizing of coating material poly(lactic acid) and by being positioned at the upwards ejection of atomizing nozzle 202 at grid distributor 203 centers, meet with the gel breaker particle 204 of process, rear at gel breaker particle 204 surface formation capsules by warm air (warm air of the present invention refers to the air of temperature in 30-40 degree centigrade of scope) drying, the rear capsule that circulates repeatedly reaches certain thickness and gets final product.
For obtaining the capsule breaker of even particle size, sieve after can the capsule breaker of making is cooling, (due to the irregularity of particle shape, the diameter in the application refers to the maximum linear distance between 2 on particle surface to obtain the capsule breaker of diameter in 3-5 millimeter scope.）。
By the coal bed gas well waterfrac treatment of the inventive method preparation with capsule breaker as shown in Figure 3, Fig. 3 is coal bed gas well waterfrac treatment capsule breaker provided by the invention.As shown in Figure 3, coal bed gas well waterfrac treatment capsule breaker provided by the invention is white granular, and its profile is irregular.
The below is described in further detail the using method of coal bed gas well waterfrac treatment provided by the invention with capsule breaker.
Coal bed gas well waterfrac treatment provided by the invention comprises with the using method of capsule breaker: described capsule breaker is joined in clean fracturing fluid together with fracturing propping agents, then carry out pressing crack construction with this clean fracturing fluid.
When using coal bed gas well waterfrac treatment provided by the invention to use capsule breaker, should be in clean fracturing fluid and fracturing propping agents (as quartz sand etc.) joins clean fracturing fluid with capsule breaker when mixing.Add the concentration of rear capsule breaker in clean fracturing fluid in milliliter-0.2 gram/100 milliliter scope of 0.1 gram/100.Then carry out pressing crack construction, guarantee that clean fracturing fluid is pressed into the stratum before broken glue at once.
The clean fracturing fluid that is used in conjunction with capsule breaker with coal bed gas well waterfrac treatment provided by the invention is Organic Sodium Salt and cats product clean fracturing fluid.
The above is only preferred embodiment of the present invention, is not for limiting protection scope of the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. a coal bed gas well waterfrac treatment capsule breaker, is characterized in that, comprising:
The capsule of the gel breaker that union base phenol polyethenoxy ether consists of and the described gel breaker of parcel made by poly(lactic acid).
2. coal bed gas well waterfrac treatment capsule breaker as claimed in claim 1, is characterized in that, the gel breaker that described union base phenol polyethenoxy ether consists of is particulate state.
3. coal bed gas well waterfrac treatment capsule breaker as claimed in claim 2, is characterized in that, the diameter of the particulate state gel breaker that described union base phenol polyethenoxy ether consists of is in 2-3 millimeter scope.
4. any one coal bed gas well waterfrac treatment capsule breaker described in claim 1-3, is characterized in that,
The diameter of described capsule breaker is in 3-5 millimeter scope.
5. the preparation method of a coal bed gas well waterfrac treatment use capsule breaker, is characterized in that, the method comprises:
With gel breaker polyoxyethylene nonylphenol ether granulation shape;
The lapping poly(lactic acid) atomized and it is met with gel breaker in warm air, forming the capsule that is wrapped in the gel breaker surface.
6. preparation method as claimed in claim 5, is characterized in that, described method further comprises after with gel breaker polyoxyethylene nonylphenol ether granulation shape:
The granular gel breaker of making is sieved, obtain the particulate state gel breaker of diameter in 2-3 millimeter scope;
The lapping poly(lactic acid) is atomized and make its in warm air with sieve after gel breaker meet, form the capsule be wrapped in the gel breaker surface.
7. preparation method as described in claim 5 or 6, is characterized in that, described method also comprises after forming in the lapping poly(lactic acid) capsule that is wrapped in the gel breaker surface:
Sieve after the capsule breaker of making is cooling, obtain the capsule breaker of diameter in 3-5 millimeter scope.
8. coal bed gas well waterfrac treatment as claimed in claim 1 with the using method of capsule breaker, is characterized in that, the method comprises:
Described capsule breaker is joined in clean fracturing fluid together with fracturing propping agents, then carry out pressing crack construction with this clean fracturing fluid.
9. using method as claimed in claim 8, is characterized in that,
After joining in clean fracturing fluid described capsule breaker together with fracturing propping agents, the concentration of capsule breaker in clean fracturing fluid is in milliliter-0.2 gram/100 milliliter scope of 0.1 gram/100.
10. using method as claimed in claim 8 or 9, is characterized in that,
Described clean fracturing fluid is Organic Sodium Salt and cats product clean fracturing fluid.
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| CN2013100853550A CN103160270A (en) | 2013-03-18 | 2013-03-18 | Encapsulated gel breaker for hydraulic fracturing of coalbed methane well, as well as preparation and using methods thereof |
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| CN2013100853550A CN103160270A (en) | 2013-03-18 | 2013-03-18 | Encapsulated gel breaker for hydraulic fracturing of coalbed methane well, as well as preparation and using methods thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103773327A (en) * | 2013-12-20 | 2014-05-07 | 长江大学 | Solid-free active salt water drilling fluid for coalbed methane (CBM) horizontal wells |
| CN108822816A (en) * | 2018-06-25 | 2018-11-16 | 中国石油集团渤海钻探工程有限公司 | A kind of molten GEL USED FOR PLUGGING WELL LOST CIRCULATION of loose sand theobromine and preparation method thereof |
| CN109294543A (en) * | 2018-10-22 | 2019-02-01 | 唐山冀油瑞丰化工有限公司 | A kind of profile control degradation agent and preparation method thereof |
| CN111514606A (en) * | 2020-04-29 | 2020-08-11 | 吉林中粮生化有限公司 | Polylactic acid crystallization system |
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| CN102199421A (en) * | 2010-03-22 | 2011-09-28 | 天津大港油田科远石油工程有限责任公司 | Modifier for high-pour-point crude oil |
| CN102690645A (en) * | 2012-06-08 | 2012-09-26 | 中国海洋石油总公司 | Sustained-release gel-breaking type fracturing propping agent and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102199421A (en) * | 2010-03-22 | 2011-09-28 | 天津大港油田科远石油工程有限责任公司 | Modifier for high-pour-point crude oil |
| CN102690645A (en) * | 2012-06-08 | 2012-09-26 | 中国海洋石油总公司 | Sustained-release gel-breaking type fracturing propping agent and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103773327A (en) * | 2013-12-20 | 2014-05-07 | 长江大学 | Solid-free active salt water drilling fluid for coalbed methane (CBM) horizontal wells |
| CN108822816A (en) * | 2018-06-25 | 2018-11-16 | 中国石油集团渤海钻探工程有限公司 | A kind of molten GEL USED FOR PLUGGING WELL LOST CIRCULATION of loose sand theobromine and preparation method thereof |
| CN109294543A (en) * | 2018-10-22 | 2019-02-01 | 唐山冀油瑞丰化工有限公司 | A kind of profile control degradation agent and preparation method thereof |
| CN109294543B (en) * | 2018-10-22 | 2020-11-27 | 唐山冀油瑞丰化工有限公司 | Profile control degradation agent and preparation method thereof |
| CN111514606A (en) * | 2020-04-29 | 2020-08-11 | 吉林中粮生化有限公司 | Polylactic acid crystallization system |
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Application publication date: 20130619 |