CN103982169B - Sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid - Google Patents
Sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid Download PDFInfo
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- CN103982169B CN103982169B CN201410177405.2A CN201410177405A CN103982169B CN 103982169 B CN103982169 B CN 103982169B CN 201410177405 A CN201410177405 A CN 201410177405A CN 103982169 B CN103982169 B CN 103982169B
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Abstract
Sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid disclosed by the invention, first prepares polyprotic acid, preposition acid, then injects control seam agent and preposition acid to Oil/gas Well target zone simultaneously；Then polyprotic acid, liquid nitrogen and cross-linking agent it are injected simultaneously into；Then liquid nitrogen is reinjected；Then liquid nitrogen, polyprotic acid, cross-linking agent, ceramsite sand it are injected simultaneously into；Finally all liq injecting well head is discharged in clean-up pit.The method of the present invention utilizes polyprotic acid to make slit, cross-linking agent is taken sand and kept seam length, liquid nitrogen to supplement stratum energy, by slug formula, polyprotic acid, cross-linking agent, liquid nitrogen are injected stratum, improve fracture length, the communication capability of microcrack and quick fluid-discharge, be finally reached crack and keep for a long time.
Description
Technical field
The invention belongs to oil-gas mining technical field, relate to a kind of polynary frozen glue acid and take the acidifying of sand adjustable slit height
Fracturing process.
Background technology
Carbonate reservoir acid fracturing well stimulation, its control acid fracturing chief factors of success and have three: one be
The effective length in final acid fracturing crack；Two is the ability linking up microcrack；Three is acid-etched fracture after acid fracturing
Flow conductivity.Effective crack length is by acid liquid loss, acid-rock reaction speed and acid stream in seam
The impact of speed, acid solution type etc..Linking up microcrack is the effective means improving gas testing yield, splits in guarantee
While seam length, the communication capability improving microcrack is most important.The flow conductivity of acid-etched fracture is closed
Conjunction, the dissolving power of acid, the acid etching kenel of acid-rock reaction, the acid impact on the absolute meltage etc. of rock.
Therefore carbonate reservoir acidfracturing treatment is for improving acidizing effect, and three main targets of pursuit are exactly longer
Acid-etched fracture length, microcrack communication capability and higher acid corrosion fracture, thus reach to split
Seam can keep for a long time.
Summary of the invention
It is an object of the invention to provide a kind of polynary frozen glue acid and take sand adjustable slit height acidifying fracturing process, reach
The effect that crack keeps for a long time.
The technical solution adopted in the present invention is, sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid,
Comprise the following steps:
Step 1: prepare polyprotic acid
According to mass percent, weigh following raw material: hydrochloric acid: 65%-80%, formic acid: 8%-12%,
Acidification corrosion inhibitor: 1%-2%, thickening agent: 0.4%-0.8%, ferrous stability: 1%-2%, the row of helping
Agent: 0.2%-0.4%, clear water: 2.8%-24.4%, the mass percent sum of above each component is 100%,
Add raw materials into the first acid tank in above ratio, then mixed by pump truck, obtain polyprotic acid；
Step 2: prepare preposition acid
According to mass percent, weigh following raw material: hydrochloric acid: 55%-70%, acidification corrosion inhibitor: 1%-2%,
Ferrous stability: 1%-2%, cleanup additive: 0.2%-0.4%, clear water: 25.6%-42.8%, above respectively
The mass percent sum of component is 100%, adds raw materials into the second acid tank in above ratio, then
Mixed by pump truck, obtain preposition acid；
Step 3: enforcement acid fracturing:
First inject control seam agent and 10 side-30 measured step rapid 2 of 20 side-50 sides to Oil/gas Well target zone simultaneously
In the preposition acid made；Then polyprotic acid, 5 sides made it are injected simultaneously in 100 side-400 measured step rapid 1
The liquid nitrogen of-20 sides and the cross-linking agent of 1 side-4 side；Then the liquid nitrogen of 5 side-10 sides is reinjected；Then simultaneously
Inject polyprotic acid, 0.5 side-2 side made in the liquid nitrogen of 5 side-10 sides, 50 side-200 measured step rapid 1
Cross-linking agent and the ceramsite sand of 4 side-16 sides；After 1-8 hour, all liq row of well head will be injected
In clean-up pit, i.e. complete acid fracturing.
The feature of the present invention also resides in,
In step 3, when last discharge opeing, 5 side-15 side's liquid nitrogen and 3-10 root bubble rod row is utilized also to penetrate
The hole section thoroughly row of returning.
Hydrochloric acid be mass concentration be the technical hydrochloric acid of 31%.
Formic acid is the formic acid that mass concentration is not less than 85%.
The invention has the beneficial effects as follows: the multiple-limb while regulation seam height, polyprotic acid formed to acid fracturing
Acid-etched fracture combine with adding the ceramsite sand crack of higher flow conductivity that sand formed, reached crack
The effect kept for a long time.
Accompanying drawing explanation
Fig. 1 is that the process implementing acid fracturing in sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid.
Detailed description of the invention
The present invention is described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
Sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, comprises the following steps:
Step 1: prepare polyprotic acid
According to mass percent, weigh following raw material: hydrochloric acid: 65%-80%, formic acid: 8%-12%,
Acidification corrosion inhibitor: 1%-2%, thickening agent: 0.4%-0.8%, ferrous stability: 1%-2%, the row of helping
Agent: 0.2%-0.4%, clear water: 2.8%-24.4%, the mass percent sum of above each component is 100%,
Add raw materials into the first acid tank in above ratio, then mixed by pump truck, obtain polyprotic acid；
Step 2: prepare preposition acid
According to mass percent, weigh following raw material: hydrochloric acid: 55%-70%, acidification corrosion inhibitor: 1%-2%,
Ferrous stability: 1%-2%, cleanup additive: 0.2%-0.4%, clear water: 25.6%-42.8%, above respectively
The mass percent sum of component is 100%, adds raw materials into the second acid tank in above ratio, then
Mixed by pump truck, obtain preposition acid；
Step 3: implement acid fracturing, as shown in Figure 1:
First inject control seam agent and 10 side-30 measured step rapid 2 of 20 side-50 sides to Oil/gas Well target zone simultaneously
In the preposition acid made；Then polyprotic acid, 5 sides made it are injected simultaneously in 100 side-400 measured step rapid 1
The liquid nitrogen of-20 sides and the cross-linking agent of 1 side-4 side；Then the liquid nitrogen of 5 side-10 sides is reinjected；Then simultaneously
Inject polyprotic acid, 0.5 side-2 side made in the liquid nitrogen of 5 side-10 sides, 50 side-200 measured step rapid 1
Cross-linking agent and the ceramsite sand of 4 side-16 sides；After 1-8 hour, all liq row of well head will be injected
In clean-up pit, i.e. complete acid fracturing.
In step 3, when last discharge opeing, 5 side-15 side's liquid nitrogen and 3-10 root bubble rod row is utilized also to penetrate
The hole section thoroughly row of returning.
Step 1, hydrochloric acid described in 2 be mass concentration be the technical hydrochloric acid of 31%.
Formic acid described in step 1 is the formic acid that mass concentration is not less than 85%.
Wherein, acidification corrosion inhibitor is the CHS-5 acidifying height provided by Chengdu Jian Xiang Shu Guan Science and Technology Ltd.
Temperature corrosion inhibiter；
Thickening agent is the CDC-10 frozen glue acid thickening agent provided by Chengdu Jian Xiang Shu Guan Science and Technology Ltd.；
Ferrous stability is acidified iron ion for the TWJ provided by Chengdu Jian Xiang Shu Guan Science and Technology Ltd.
Stabilizer；
Cleanup additive is the SZJ-3 acid fracturing cleanup additive provided by Chengdu Jian Xiang Shu Guan Science and Technology Ltd.；
Control seam agent is used for the FRK-KFJ fracture acidizing provided by Beijing FRAC Technology Development Co., Ltd.
Control seam agent；
Cross-linking agent is the CDS-10 frozen glue acid crosslinking agent provided by Chengdu Jian Xiang Shu Guan Science and Technology Ltd.；
The high intensity of the ceramsite sand 69MPa for being provided by Shanxi Feng Shuo petroleum fracturing propping agent company limited
Ceramsite sand petroleum fracturing propping agent.
Below by the impact on the inventive method of each factor of experimental analysis:
(1) polynary frozen glue acid rheological characteristic
The polyprotic acid placed 120 hours cross-links in agitator with cross-linking agent, obtains the acid of polynary frozen glue,
Polynary frozen glue acid being sheared 60 minutes, the viscosity recording the acid of polynary frozen glue is as shown in table 1, it can be seen that
When 60 minutes, the viscosity of polynary frozen glue acid is 119.35mPa s, it is possible to meet site operation requirement (on-the-spot
Construction requirement is: viscosity is not less than 100mPa s).
The viscosity of 60 minutes is sheared in more than 1 yuan of frozen glue acid of table
| Time (min) | Viscosity (mPa s) |
| 0 | 475 |
| 5 | 300 |
| 10 | 260 |
| 15 | 240 |
| 20 | 200 |
| 30 | 200 |
| 40 | 140 |
| 50 | 130 |
| 55 | 125 |
| 60 | 119.35 |
(2) the polynary frozen glue acidleach property lost
It is right that the evaluation of polynary frozen glue acid filtration property uses identical rock core to carry out the static filtrations of different acid
Ratio, contrast finds, the filter loss of conventional common acids is much larger than viscous acid and the acid of polynary frozen glue, and rock core pair
Little, as shown in table 2 more than viscous acid and common acids of the leak-off of polynary frozen glue acid.
Summary result of the test, polynary frozen glue acid has the advantage that
(1) polynary frozen glue acid has low filtration property.
(2) utilize polynary frozen glue acid to take sand acid fracturing, high-viscous liquid is taken sand frac-pack and is laminated with on ground
Under power and formation temperature, acid fluid system acidization after breaking gel combines, and leads finally realizing height
Acid etching-the support of stream ability is combined crack, expands oil and gas flow passage, reaches what crack kept for a long time
Effect.
Embodiment one
The polyprotic acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 70% of 31%, and mass concentration is the first of 85%
Acid 10%, CHS-5 acidification high temperature inhibiter 1.5%, CDC-10 frozen glue acid thickening agent 0.6%, TWJ
Acidifying ferrous stability 1.5%, SZJ-3 acid fracturing cleanup additive 0.3%, clear water 16.1%, above group
The content summation divided is 100%, is added by the above-mentioned raw material weighed to the first acid tank, then passes through pump truck
Mix；
The preposition acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 65% of 31%, CHS-5 acidification high temperature inhibition
Agent 1.5%, TWJ is acidified ferrous stability 1.5%, SZJ-3 acid fracturing cleanup additive 0.3%, clear water
31.7%, the content summation of above component is 100%, is added by the above-mentioned raw material weighed to the second acid tank,
Mixed by pump truck again；
Enforcement acid fracturing:
First inject the FRK-KFJ fracture acidizing control seam agent and 20 of 35 sides to Oil/gas Well target zone simultaneously
The preposition acid that side prepares；Then polyprotic acid, the liquid nitrogen of 15 sides and 2 sides that 200 sides prepare it are injected simultaneously into
CDS-10 frozen glue acid crosslinking agent；Then the liquid nitrogen of 8 sides is reinjected；Then be injected simultaneously into 8 sides liquid nitrogen,
The height of the 69MPa of polyprotic acid, the CDS-10 frozen glue acid crosslinking agent of 1.2 sides and 10 sides that 120 sides prepare
Intensity ceramsite sand petroleum fracturing propping agent；After 2 hours, all liq injecting well head is discharged to clean-up pit
In, when discharge opeing is weak, utilize 10 side's liquid nitrogen and 6 bubble rod rows going back the perforated interval thoroughly row of returning.
Embodiment two
The polyprotic acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 67% of 31%, and mass concentration is the first of 85%
Acid 9%, CHS-5 acidification high temperature inhibiter 1.25%, CDC-10 frozen glue acid thickening agent 0.5%, TWJ
Acidifying ferrous stability 1.25%, SZJ-3 acid fracturing cleanup additive 0.25%, clear water 20.75%, with
The content summation of upper component is 100%, is added by the above-mentioned raw material weighed to the first acid tank, then passes through
Pump truck mixes；
The preposition acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 60% of 31%, CHS-5 acidification high temperature inhibition
Agent 1.25%, TWJ is acidified ferrous stability 1.25%, SZJ-3 acid fracturing cleanup additive 0.25%,
Clear water 37.25%, the content summation of above component is 100%, adds the above-mentioned raw material weighed to second
In acid tank, then mixed by pump truck；
Enforcement acid fracturing:
First inject the FRK-KFJ fracture acidizing control seam agent and 15 of 25 sides to Oil/gas Well target zone simultaneously
The preposition acid that side prepares；Then polyprotic acid, the liquid nitrogen of 10 sides and 1.5 sides that 150 sides prepare it are injected simultaneously into
CDS-10 frozen glue acid crosslinking agent；Then the liquid nitrogen of 7 sides is reinjected；Then the liquid of 7 sides it is injected simultaneously into
The 69MPa's of polyprotic acid, the CDS-10 frozen glue acid crosslinking agent of 0.8 side and 7 sides that nitrogen, 80 sides prepare
High-strength ceramsite sand petroleum fracturing propping agent；After 4 hours, all liq injecting well head is discharged to discharge opeing
Chi Zhong, when discharge opeing is weak, utilizes 8 side's liquid nitrogen and 4 bubble rod rows going back the perforated interval thoroughly row of returning.
Embodiment three
The polyprotic acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 72% of 31%, and mass concentration is the first of 85%
Acid 11%, CHS-5 acidification high temperature inhibiter 1.75%, CDC-10 frozen glue acid thickening agent 0.7%, TWJ
Acidifying ferrous stability 1.75%, SZJ-3 acid fracturing cleanup additive 0.35%, clear water 12.45%, with
The content summation of upper component is 100%, is added by the above-mentioned raw material weighed to the first acid tank, then passes through
Pump truck mixes；
The preposition acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 67% of 31%, CHS-5 acidification high temperature inhibition
Agent 1.75%, TWJ is acidified ferrous stability 1.75%, SZJ-3 acid fracturing cleanup additive 0.35%,
Clear water 29.15%, the content summation of above component is 100%, adds the above-mentioned raw material weighed to second
In acid tank, then mixed by pump truck；
Enforcement acid fracturing:
First inject the FRK-KFJ fracture acidizing control seam agent and 25 of 40 sides to Oil/gas Well target zone simultaneously
The preposition acid that side prepares；Then polyprotic acid, the liquid nitrogen of 17 sides and 3 sides that 300 sides prepare it are injected simultaneously into
CDS-10 frozen glue acid crosslinking agent；Then the liquid nitrogen of 9 sides is reinjected；Then be injected simultaneously into 9 sides liquid nitrogen,
The height of the 69MPa of polyprotic acid, the CDS-10 frozen glue acid crosslinking agent of 1.6 sides and 13 sides that 160 sides prepare
Intensity ceramsite sand petroleum fracturing propping agent；After 6 hours, all liq injecting well head is discharged to clean-up pit
In, when discharge opeing is weak, utilize 12 side's liquid nitrogen and 8 bubble rod rows going back the perforated interval thoroughly row of returning.
Embodiment four
The polyprotic acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 65% of 31%, and mass concentration is the first of 85%
Acid 8%, CHS-5 acidification high temperature inhibiter 1%, CDC-10 frozen glue acid thickening agent 0.4%, TWJ acid
Change ferrous stability 1%, SZJ-3 acid fracturing cleanup additive 0.2%, clear water 24.4%, above component
Content summation be 100%, the above-mentioned raw material weighed is added to the first acid tank, then is entered by pump truck
Row mixing；
The preposition acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 55% of 31%, CHS-5 acidification high temperature inhibition
Agent 1%, TWJ is acidified ferrous stability 1%, SZJ-3 acid fracturing cleanup additive 0.2%, clear water 42.8%,
The content summation of above component is 100%, is added by the above-mentioned raw material weighed to the second acid tank, then leads to
Cross pump truck to mix；
Enforcement acid fracturing:
First inject the FRK-KFJ fracture acidizing control seam agent and 10 of 20 sides to Oil/gas Well target zone simultaneously
The preposition acid that side prepares；Then polyprotic acid, the liquid nitrogen of 5 sides and 1 side that 100 sides prepare it are injected simultaneously into
CDS-10 frozen glue acid crosslinking agent；Then the liquid nitrogen of 5 sides is reinjected；Then be injected simultaneously into 5 sides liquid nitrogen,
The 69MPa's of polyprotic acid, the CDS-10 frozen glue acid crosslinking agent of 0.5 side and 4 sides that 50 sides prepare is high-strength
Degree ceramsite sand petroleum fracturing propping agent；After 1 hour, all liq injecting well head is discharged in clean-up pit,
When discharge opeing is weak, 5 side's liquid nitrogen and 3 bubble rod rows are utilized to go back the perforated interval thoroughly row of returning.
Embodiment five
The polyprotic acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 80% of 31%, and mass concentration is the first of 85%
Acid 12%, CHS-5 acidification high temperature inhibiter 2%, CDC-10 frozen glue acid thickening agent 0.8%, TWJ acid
Change ferrous stability 2%, SZJ-3 acid fracturing cleanup additive 0.4%, clear water 2.8%, above component
Content summation is 100%, is added by the above-mentioned raw material weighed to the first acid tank, then is carried out by pump truck
Mixing；
The preposition acid in sand adjustable slit height acidifying fracturing process is taken in the polynary frozen glue acid of the present invention, by quality hundred
Proportion by subtraction weighs following raw material: mass concentration is the technical hydrochloric acid 70% of 31%, CHS-5 acidification high temperature inhibition
Agent 2%, TWJ is acidified ferrous stability 2%, SZJ-3 acid fracturing cleanup additive 0.4%, clear water 25.6%,
The content summation of above component is 100%, is added by the above-mentioned raw material weighed to the second acid tank, then leads to
Cross pump truck to mix；
Enforcement acid fracturing:
First inject the FRK-KFJ fracture acidizing control seam agent and 30 of 50 sides to Oil/gas Well target zone simultaneously
The preposition acid that side prepares；Then polyprotic acid, the liquid nitrogen of 20 sides and 4 sides that 400 sides prepare it are injected simultaneously into
CDS-10 frozen glue acid crosslinking agent；Then the liquid nitrogen of 10 sides is reinjected；Then the liquid of 10 sides it is injected simultaneously into
Polyprotic acid, the CDS-10 frozen glue acid crosslinking agent of 2 sides and the 69MPa of 16 sides that nitrogen, 200 sides prepare
High-strength ceramsite sand petroleum fracturing propping agent；After 8 hours, all liq injecting well head is discharged to
In liquid pool, when discharge opeing is weak, 15 side's liquid nitrogen and 10 bubble rod rows are utilized to go back the perforated interval thoroughly row of returning.
Claims (1)
- Sand adjustable slit height acidifying fracturing process is taken in the most yuan of frozen glue acid, it is characterised in that comprise the following steps:Step 1: prepare polyprotic acidAccording to mass percent, weigh following raw material: hydrochloric acid: 65%-80%, formic acid: 8%-12%, Acidification corrosion inhibitor: 1%-2%, thickening agent: 0.4%-0.8%, ferrous stability: 1%-2%, the row of helping Agent: 0.2%-0.4%, clear water: 2.8%-24.4%, the mass percent sum of above each component is 100%, Add raw materials into the first acid tank in above ratio, then mixed by pump truck, obtain polyprotic acid；Step 2: prepare preposition acidAccording to mass percent, weigh following raw material: hydrochloric acid: 55%-70%, acidification corrosion inhibitor: 1%-2%, Ferrous stability: 1%-2%, cleanup additive: 0.2%-0.4%, clear water: 25.6%-42.8%, above respectively The mass percent sum of component is 100%, adds raw materials into the second acid tank in above ratio, then Mixed by pump truck, obtain preposition acid；Step 3: enforcement acid fracturing:First inject control seam agent and 10 side-30 measured step rapid 2 of 20 side-50 sides to Oil/gas Well target zone simultaneously In the preposition acid made；Then polyprotic acid, 5 sides made it are injected simultaneously in 100 side-400 measured step rapid 1 The liquid nitrogen of-20 sides and the cross-linking agent of 1 side-4 side；Then the liquid nitrogen of 5 side-10 sides is reinjected；Then simultaneously Inject polyprotic acid, 0.5 side-2 side made in the liquid nitrogen of 5 side-10 sides, 50 side-200 measured step rapid 1 Cross-linking agent and the ceramsite sand of 4 side-16 sides；After 1-8 hour, all liq row of well head will be injected In clean-up pit, i.e. complete acid fracturing；In described step 3, when last discharge opeing, 5 side-15 side's liquid nitrogen and 3-10 root bubble rod row is utilized to exist The perforated interval thoroughly row of returning；Described step 1, hydrochloric acid described in 2 be mass concentration be the technical hydrochloric acid of 31%；Formic acid described in described step 1 is the formic acid that mass concentration is not less than 85%.
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| CN201410177405.2A CN103982169B (en) | 2014-04-29 | 2014-04-29 | Sand adjustable slit height acidifying fracturing process is taken in polynary frozen glue acid |
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| US7584791B2 (en) * | 2007-02-08 | 2009-09-08 | Halliburton Energy Services, Inc. | Methods for reducing the viscosity of treatment fluids comprising diutan |
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