WO2014183312A1

WO2014183312A1 - Novel vegetable gum fracturing fluid jelly for oil well

Info

Publication number: WO2014183312A1
Application number: PCT/CN2013/077032
Authority: WO
Inventors: 孙虎; 王祖文; 张冕; 廖乐军; 高燕; 李婧; 赵文钢; 陈亚联; 郭伟林; 李楠; 高红平
Original assignee: 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司
Priority date: 2013-05-16
Filing date: 2013-06-09
Publication date: 2014-11-20
Also published as: CN103215025B; CN103215025A

Abstract

The present invention relates to a novel vegetable gum fracturing fluid jelly for an oil well. The novel vegetable gum fracturing fluid jelly for the oil well is characterized by being prepared from the following components: 0.15-0.25% of fenugreek gum, 0.3-0.85% of anti-swelling agent, 0.4-0.8% of cross-linking agent, 0.3-1.0% of cleanup additive, 0.05-0.1% of bactericide, and 97.0-98.8% of water, wherein percentages aforementioned are mass percentages. A use concentration of the fenugreek gum in the novel vegetable gum fracturing fluid jelly for the oil well is low, and a use temperature ranges from room temperature to 145℃; a cost of underground construction work is reduced, and normal production and sustainable development of oilfield are guaranteed; and a research result has obvious economic benefits, important social benefits, and great popularization and application prospects.

Description

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The invention relates to a fracturing fluid jelly, in particular to a novel sputum fracturing fluid for oil wells.

Changqing Oilfield is a low-porosity, ultra-low-permeability tight reservoir. The oil and gas exploration area is large. Nearly 10,000 wells need to be fractured every year because of the large demand for fracturing fluids, especially high-quality fracturing liquid products. a former Changqing oilfield in the oil and fracturing construction usually - using 3⁄4 propyl silicone system as a construction liquid, although the fracturing fluid of this system better meets the needs of the oil ffl field fracturing process, with the 2012 fox The straight line of rubber prices has risen and the supply channels are single, which has caused high cost and supply instability for fracturing construction. At the same time, the gelatin system has a high concentration of the use agent, a large amount of the breaker, and a large damage rate to the support crack conductivity.

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The object of the present invention is to provide a low-cost, high-performance, low-temperature, high-temperature, gel-breaking base for supporting the deficiencies of the prior art. New vegetable gum fracturing fluid jelly for oil wells with small crack conductivity. It can also achieve the fracturing of the fracturing «.

The present invention is achieved by the following technical solution, a novel vegetable gum fracturing fluid jelly for oil wells, characterized in that it is prepared from the following components: coumarin gum 0. 15~0, 25% 0%, 杀剂剂0. 3〜1. 0%, 菌剂0. (3⁄4~0. 1% and water, anti-swelling agent 0, 3~0, 85%, cross-linking agent 0. 4~0, 8%, helper agent 0. 3~1. 97. 0~ 98. 8% composition, the above percentages are mass percentages.

The fast anti-swelling agent is a compound of a polyquaternium having a molecular weight of less than 40,000 and a potassium chloride. The crosslinking agent is 1,2-dicarbo-dodecane.

The drainage aid is a combination of sodium lauryl sulfate and an alcohol.

The bactericide is aldehyde or glutaraldehyde _δ

The coumarin gum is traded as coumarin gum XYXD 1, anti-J Peng agent is the trade name anti-swelling agent XYFP-1, and the drainage aid is the product name as the drainage aid XYWZ 1.

The product name is fragrant bean 1. The product name anti-swelling agent XYFP 1, the product name drainage agent XWZ 1 , the above reagents are purchased from Xi'an Changqing Oilfield Company Chemical Group.

The preparation process of the coumarin gum comprises the following steps: taking the couma bean film and fully dissolving in the water for 5 small Then, the swollen coupon pieces are taken out, and the coumarin film is extruded and extruded by a three-roller machine, and the extrusion puffing time is 4 hours, and then the film is dried under lOfTC, and the film is baked to a half state. After taking out, use the » crusher to smash the film, and require the coumarin powder to pass through SSW0. 090/0. 063 sieve fineness is 92. 5%, and the coriander powder is dried at 60 ° C. After 8 hours of drying, the rubber powder was taken out as a finished bean.

The water-insoluble matter of the 3⁄4!3⁄4 coumaine is 3.5~9.0%, and the water content is 6.5~9.0%.

Compared with the prior art, the invention has the following technical effects: 1) the concentration of the agent is low, the crack concentration of the new coumarin gum is 0.15 0.35%, and the concentration of the conventional PCT glue fracturing fluid is 0.25~0.55% „ 2) With high temperature resistance, 0.35% coumarin fracturing fluid has a temperature resistance of 145 Ό, while conventional PCT fracturing fluid has a temperature resistance of 9 (TC. 3). The limb is fast, the gel is completely broken, and the support is 3⁄4. The sulcus conductivity is less harmful, the injury rate is less than 22%, and the pulsation rate of the conventional pulsating fracturing fluid to the supporting crack is greater than 22%. 4) The coumarin glue produced is 3.5~9.0%. The ice content is 6.5~9.0%, with low water content and low water insoluble matter: tt.

The composition, performance and method of the fracturing 'de-gelling gel of the present invention will be described in detail below with reference to the examples and the examples P, but not as R for the present invention.

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FIG 1 is a preparation process of the present invention fenugreek gum FIG _β

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The oil uses a new type of vegetable gum fracturing liquid jelly, which is prepared by the following components by mass percentage: coumarin 0.1%, anti-swelling agent 0.5% cross-linking agent 0.6%, drainage agent 0.7% , fungicide 0.08% and water 97.92% composition, (for the best formula) 3⁄4 of the coumarin gum is the trade name for coumarin gum XYXD-1, anti-swelling agent is the product name for the anti-shadow agent XYFP-1, help The agent is the product name as the drainage aid XYWZ-1, the cross-linking agent is 1, dicarbo-dodecane, the bactericide is aldehyde or glutaraldehyde. The chemical reagents of Shangyu are purchased from Xi'an Changqing Oil Ffl Branch. Chemical Group, address R, Chaoyang 7 Road, Licheng District, PB City, Shandong Province, 3⁄4, 712042. The above thickener is coumarin gum, which acts as an aqueous solution to thicken the gel and is suitable for oil and _β

The preparation process is as follows

In the high-speed stirrer, adding 97. 2ml of sterilized agent, adding 9 grams of coumarin gum, stirring for 3 minutes, then adding 5 grams of anti-swelling agent, 7 grams of drainage aid, 0. 8 grams of fungicide , stirring for 3 minutes, stirring evenly to obtain the base liquid of the present invention Take the above base liquid, use a wide pH test paper, and measure the pH value of the base liquid to 7~8 _{; in the} state of stirring, add 6 grams of cross-linked cut, and use a wide pH test paper to measure the pH value of the cross-linked fracturing fluid. 8~9, the crosslinking time is

In 18 seconds, the jelly of the present invention was obtained. The viscosity of the obtained base liquid was 10.5 _m Pa> _S , and the jelly formed after cross-linking was sheared at 100 ° C for 1 hour by a PVS rheometer, and the viscosity of the jelly was 72 mP _a . To achieve the same viscosity, the concentration of 3⁄4 propyl PCT is at least 0.35% and the maximum temperature is 90V. 3%, Ρ — 膨膨膨一种一种一种一种油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油油The cross-linking agent is 0.4%, the helper agent is 0.3%, the bactericide is 0. 05% and the water is 98.8%, and the |» swell agent is a polyquaternium and potassium chloride having a molecular weight of less than 40,000. The compound; the fast crosslinking agent is 1,2-dicarbo-dodecane. The drainage aid is a composite of uranium dodecanoate and an alcohol. The bactericide is formaldehyde or glutaraldehyde. The coumarin gum is the trade name of coumarin gum XYXD-1, purchased from Xi'an Changqing Oilfield Company Chemical Group, address insurance, Chaoyang 7 Road, Qingcheng District, Xianyang City, West Province, 712042. The oil gel suitable for preparing the same procedure _Β embodiment 1 side.

Although the viscosity of the base liquid is only 3⁄4 iiPa, the gel after the cross-linking is deformed at 80 ° C for 60 minutes by a PVS rheometer, and the viscosity is 70 mP _ae to reach the same viscosity. Normal 3⁄4 propyl PCT The concentration of hydroxypropyl tannin required for the jelly is at least 0.3%.

实肃两3 A new type of plant 骹 fracturing fluid jelly for oil sputum, which is prepared by pressing the following components at a speed percentage: coumarin gum 0,25%, anti-swelling agent 0,85%, The combination agent is 0.8%, the drainage aid 1.0%, the bactericide 0.1% and the water 97.0%. The anti-swelling agent is the trade name anti-swelling agent XYFP 1, and the drainage aid is the product name as the drainage agent XYffZ-1 The cross-linking agent is 1,2-dicarbona-doderacane, and the bactericide is formaldehyde or dialdehyde. The above chemical reagents are purchased from Xi'an Changqing Oilfield Company Chemical Group, and ttR 7 in Chaoyang City, Xianyang City, Xiyang City Road, zip code 712042. It can also be purchased from other markets. The jelly is suitable for use in oil wells. Preparation process Example 1 ₀

As shown in Figure 1: The coumarin gum is prepared by the following process steps: 100 g of coumarin film is fully swelled in 900 g of water for 5 hours, and then the swollen coumarin film is taken out using a three-roller machine to the coumarin The film is extruded and extruded, and the extrusion time is 4 hours. Then the R piece is dried under 105 ,, and after the film is taken to a half-thousand state, it is taken out, and the film is pulverized by a pulverizer, and the coumarin powder is required to pass.

SSW0. 090/0. 063 sieve fineness is 92, 5% (percentage is mass percentage). The coumarin powder is dried at 6 °C under low temperature, and the powder is taken out for 8 hours to obtain the finished coumarin gum. The made coumarin glue insoluble matter is 0〜9. 0%, having a water content of 6. 5~9. 0%, having characteristics of low water content and low water insoluble matter.

Although the viscosity of the base liquid was only 22,5 mPa«s, the gel formed after cross-linking was sheared at 14 CTC for 90 minutes by a PVS rheometer, and the viscosity of the gel was 68 mP«. Concentration to achieve the same viscosity hydroxypropyl guar gum, hydroxypropyl guanidine ordinary gum jellies require at least 0.45% _β jelly temperature capabilities of the present invention to achieve 145 ° C, and hydroxypropyl guar gum fracturing fluid temperature as

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This example gives the formulation of the fracturing fluid of the present invention and the freeze performance at low coumarin dosage. The selected coumarin gum product code is "XYXD-1", planted by Anhui Province; using a compound of polyquaternium it and potassium chloride with a molecular weight of less than 40,000 as a swell agent; using 1,2-two carbon generation Diboronium as a crosslinking agent; a composition of sodium dodecyl sulfate and an alcohol as a drainage aid; a formulation of 0.2% XYXD-1 + 0.3%|3⁄4 The agent +0.3% drainage aid + 0.1% fungicide fracturing liquid base solution has been prepared as follows

In a high-speed agitator, 1000 ml of water was added, and under stirring, 2.0 g of XYXD-1 was added, and after stirring for 3 minutes, 3 g of anti-swelling agent, 1 g of fungicide, and 3 g of a drainage aid were sequentially added. Stir 3ηώι, mix well and obtain base liquid containing 0.2% XYXD-1

Take 100 g of the above base liquid, and use a wide range of ρΗ value test paper to measure the base liquid ρΗ letter as 7~8 _{; in the} half-state, add 0.4 g of cross-linking agent, cross-linking fracturing fluid ρΗ儳 is 8~9, The crosslinking time is 21s. Although the viscosity of the base fluid only 9mPa _'S, but frozen after crosslinking pasterns in 8 <TC PVS rheometer after shearing after 60 minutes' ft of gel is 70 iBPa. To achieve the same ft, the 3⁄4 propyl phthalate concentration required for normal 3⁄4 propyl virgin rubber is at least 0.3%.

Real clock two 5 This example gives the performance of 0.25 XYXD-1 fracturing fluid jelly. The formula for pressing 3⁄4 liquid is

0.25% XYXD-1 + 0.3% anti-swelling agent + 0.3% drainage aid + 0.1% bactericide. . Preparation process of fracturing fluid

H two. The viscosity of the obtained base liquid was i0.5 mP _S . Take 100 ml of base solution, and add 60 g of cross-linking agent to form a cross-linked jelly for 18 s. After 1 hour of 1 WFC shearing by PVS rheometer, the gel viscosity is 62 _m P∑ _S . To achieve the same viscosity, the normal hydroxypropyl hydrazine jelly requires a hydroxypropyl pulse concentration of at least 0.35%.

Whoever reverses this example gives an example of hydraulic fracturing using the fracturing fluid jelly of the implementation of the present invention. Changqing Oilfield Mountain 060-50 is located in Yizheng Township, Zhidan County, R Province, and is structurally belonging to the Yishang Slope in the Ordos Basin. The well depth is 2094.00m, and the finished drilling layer is 6 layers long. The reservoir resistivity is 10.22Qm, the reservoir porosity is 11.27%, and the reservoir permeability is 43.48x 10- ³ μηι ² , which belongs to the low porosity and ultra-low permeability reservoir and needs to be developed by fracturing technology.

On October 23, 2012, sand fracturing was carried out on Mount 060-50. It was prepared in Example 1 embodiment jelly 120m ^3, active water 30m ^3, main construction parameters: displacement i.6 _m ³ / min, burst pressure 28.7MPa, operation pressure 17.8MPa, stop the pump pre-pressure used _7.8Μ Β The liquid is 21rf, the sand carrying liquid is 83m ³ , the replacement liquid is 5.4 in ³ , the average sand ratio is 30.1%, the total sand content is 25.0m ³ » the total liquid volume is 109.4 ηΛ, the oil production is 22.5m ³ , and the daily output ice is 5.2m ³ .

In this embodiment, the jelly of any one of the steels 2-5 can be used, and the effects are basically the same, and the effects of the embodiment 1 and the embodiment 3 are good.

The parts and the abbreviations that are not described in detail in this embodiment are common knowledge of the Bank, and can be searched on the Internet, and are not described here. The novel plant I cross-cracking fluid of the invention is suitable for oil wells of different reservoirs. ffi cracking construction The invention realizes the fracturing fluid according to the characteristics of small molecular weight of the coumarin gum and less addition of the broken cross-crossing agent [Hit treatment; Root «Different reservoir characteristics to select the corresponding oil well fracturing. The liquids used in this construction can reduce the cost of underarm work, ensure the normal production and sustainable development of oil ffl; the research results are not only obvious The economic benefits' have important social benefits and have great application prospects.

Claims

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1. A novel vegetable gum fracturing fluid jelly for oil wells, characterized in that it is prepared from the following components: coumarin gum 0, 15~0, 25% > anti-swelling agent 0, 3~0. 8%, the cross-linking agent 0. 4~0. 8 , the helper agent 0. 3~ 1. 0%, the fungicide 0. 05~0. 1% and water 97. 0~98, composition, the above percentage As a percentage of mass.

2. A novel vegetable gum fracturing fluid crucible for oil wells according to claim 1, wherein: said anti-swelling agent is a compound of polyquaternium it and potassium chloride having a molecular weight of less than 40,000.

3. A novel vegetable gum for fleas according to claim 1, which is a fracturing fluid jelly, characterized in that - the cross-linking agent is 1,2-di-[deca-dodecyl].

4. In accordance with one oil a fan of claim twisted fracturing fluid gel with new plants, characterized in _that: said drainage aid is sodium lauryl sulfate and synthetic alcohols "

5. A new vegetable gum fracturing fluid for oil wells according to claim 1, wherein the W germicide is aldehyde or glutarylene.

6. A novel vegetable gum fracturing fluid jelly for oil well according to claim 1, wherein: the coumarin gum is comminuted as coumarin gum XYX^l, and the anti-swelling agent is a trade name. For the anti-swelling agent XYFP-1, the drainage aid is the trade name for the drainage aid XYWZ - 1„

7. According to the claim of the right and left, one type of oil is used in combination with the new plant ship fracturing fluid jelly, which is characterized by the trade name of coumarin gum XYXD-1, the product name K swell agent, and the name of the product. - 1, the above reagents were purchased from Xi'an Changqing Oilfield Company Chemical Group _β

8. The novel vegetable gum fracturing fluid jelly for oil well according to claim 1, characterized in that: the preparation process of the coumarin gum comprises the following steps: taking the cous bean film in the water sufficiently After the hour, the swollen bean film was taken out, and the bean film was extruded and extruded by a three-roller machine. The extrusion time was 4 hours, and the film was dried at 105 Torr, and the film was taken out to half a state and then taken out. Using the smasher to smash the film, the fragrant bean dumpling powder is required to pass SSffO. 090/0. 063 sieve fineness is 92. 5%, the coumarin gum is dried at 6 (TC), dry The rubber powder was taken out for 8 hours to be a finished coumarin gum.

9. A new type of vegetable gum fracturing fluid for oil wells according to the requirements of the patent claim 8 is characterized in that the water-insoluble matter of the coumarin gum product is 3.5 to 9.0% and the water content is 6.5 to 9.0%.