CN106047323B - A kind of water solubility diverting agent and preparation method thereof - Google Patents
A kind of water solubility diverting agent and preparation method thereof Download PDFInfo
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- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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Abstract
The present invention provides a kind of water-soluble diverting agents and preparation method thereof, water solubility diverting agent of the present invention uses in fracturing process, crack can preferably be blocked, with certain elasticity and intensity, its dosage is few, temperature resistance ability and bearing capacity are good, can be bonded in fracture faces completely, nontoxic, green, environmentally friendly；The preparation method of water solubility diverting agent of the present invention is simple, and the diverting agent function admirable prepared measures it by core flow test instrument and reaches 10MPa in 90 DEG C of bearing capacities, and 90 DEG C of times being dissolved in fracturing fluid, residue content was less than 1% in 4 hours；And water-soluble diverting agent price of the present invention is relatively low.
Description
Technical field
The invention belongs to be applied to pressure break temporarily to block up the sealing agent fields stitched more, more particularly, to a kind of water-soluble diverting agent and
Preparation method.
Background technique
It has become better and approaching perfection day by day for the horizontal well naked eye staged fracturing reforming technology of tight sandstone reservoir, and has been advised greatly at present
Mould promotes and applies, and is made that tremendous contribution for hyposmosis tight sand Efficient Development, but as exploitation is deeply and to stone
The increase of oily natural gas demand improves yield to the greatest extent, and reduces construction risk and difficulty simultaneously, becomes us and continues
The direction deeply made great efforts, for example multiple cracking pressure break is realized on open-hole horizontal well, increase the transformation volume of reservoir.
By temporarily blocking up more seam technologies in net horizontal section, filter cake bridge blinding is generated in high permeability zone with diverting agent, formation is higher than upper
The pressure difference of layer gash fracture pressure, promotes the generation newly stitched.To realize multiple crack fracturing in net horizontal section, increases horizontal segment and split
Density is stitched, mining-employed reserves of horizontal well are further increased, realizes that purpose is transformed in Domain Volume, improves gas well yield.
The water-soluble diverting agent of studies in China is mostly the compounding product of high molecular polymer at present, and dissolution is fast, cannot
It is used in the higher well of temperature, the reduction of bearing capacity caused by dissolution is too fast also affects effect of the diverting agent in construction, is
This improves original defect by synthesizing new water-soluble diverting agent, reduces it in 80 DEG C or more dissolubilities, and protect
Its bearing capacity is demonstrate,proved.
Summary of the invention
In view of this, the present invention is directed to propose it is a kind of water solubility diverting agent, cannot be in temperature to solve existing diverting agent
The problems such as higher well uses and bearing capacity is low.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of water solubility diverting agent, it is characterised in that:
By weight percentage, it is prepared from the following components:
Further, the crosslinking agent is glutaraldehyde.
Further, the secondary monomer is hydroxypropyl guar gum and modified starch.
Further, the mass ratio of the hydroxypropyl guar gum and modified starch is 3:1~1:1.
Further, the modified starch is carboxymethyl starch.
Further, the main monomer is gelatine, and the water-proofing agent is sulfonated gilsonite.
The present invention also provides a kind of preparation methods of water-soluble diverting agent, include the following steps:
1) each component is weighed according to the ratio；
2) main monomer is poured into the reaction flask equipped with weighed gauge water, 75-85 DEG C of constant temperature stirring, until main monomer is abundant
It is dissolved in water；
3) reaction temperature is reduced to after 65~75 DEG C, adjusts the pH value of solution to 7~8 and secondary monomer is added, secondary monomer is
Hydroxypropyl guar gum and modified starch.Hydroxypropyl guar gum, modified starch are successively sequentially added in proportion, until secondary monomer sufficiently dissolves and is
It can；
4) reaction temperature is reduced to 40~50 DEG C, is proportionally added into crosslinking agent, after constant temperature stirs 20~40min, constant temperature is anti-
It answers 3~4 hours and obtains preliminary product；
5) it is proportionally added into quantitative water-proofing agent, is evenly stirred until to obtain diverting agent thick liquid；
6) diverting agent thick liquid is poured into the square box for being covered with tinfoil, it is small is placed in thermostatic drying chamber dry 24
When week take out, tear off tinfoil, the diverting agent for becoming solid colloidal is cut into the rectangular particle within length 1cm, continues to place
Diverting agent finished product is obtained after 24 hours dry in thermostatic drying chamber.
Further, 80 DEG C of stirrings 20-40min, preferably 30min of constant temperature in step 2)；
Reaction temperature is reduced in step 3) to 70 DEG C, and secondary monomer is added and is down to reaction temperature after constant temperature stirs 30min
45℃；
The pH value of main monomer solution is adjusted in step 4) to after 7.5, reducing reaction temperature to 55 DEG C, perseverance reaction 3.5 hours
Preliminary product is obtained afterwards；
20~40min, preferably 30min are stirred in step 5)；
The temperature of thermostatic drying chamber is 100 DEG C in step 6).
Further, main monomer addition reaction flask is placed in 80 DEG C of water-baths of constant temperature in step 2)；
Step 2), step 4), feeds in step 5) at step 3) while stirring.
Further, the high 2cm of square box in step 6).
Compared with the existing technology, water-soluble diverting agent of the present invention has the advantage that
(1) water-soluble diverting agent of the present invention uses in fracturing process, can preferably block crack, has certain
Elasticity and intensity, dosage is few, and temperature resistance ability and bearing capacity are good, can be bonded in fracture faces, nontoxic, green, ring completely
It protects；
(2) preparation method of water-soluble diverting agent of the present invention is simple, and the sealing agent function admirable prepared passes through
Core flow test instrument measures it and reaches 10MPa in 90 DEG C of bearing capacities, and 90 DEG C of times being dissolved in fracturing fluid were at 4 hours
Interior, residue content is less than 1%；And water-soluble diverting agent price of the present invention is relatively low.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is that diverting agent swelling volume described in the embodiment of the present invention 1 changes with time；
Fig. 2 is that diverting agent swelling volume described in the embodiment of the present invention 2 changes with time；
Fig. 3 is that diverting agent swelling volume described in the embodiment of the present invention 3 changes with time；
Fig. 4 is that diverting agent swelling volume described in the embodiment of the present invention 4 changes with time；
Fig. 5 is that diverting agent swelling volume described in the embodiment of the present invention 5 changes with time.
Specific embodiment
Unless otherwise stated, term used in the present invention all has the meaning that those skilled in the art routinely understand, is
It is easy to understand the present invention, some terms used in the present invention have been subjected to following definitions.
It using in the specification and in the claims, singular type "one" and " this " they include plural reference, unless on
Hereafter separately there is clear statement.For example, term " (one) cell " includes the cell of plural number, including its mixture.
All number marks, such as pH, temperature, time, concentration, including range, are all approximations.It is to be understood that although
Term " about " is all added before always not describing all number marks explicitly.While it will also be understood that, although always not clear
Narration, reagent described herein is only example, and equivalent is known in the art.
Below with reference to examples and drawings, the present invention will be described in detail.
Modified starch is carboxymethyl starch in embodiment 1-5, and diverting agent is made in accordance with the following methods in embodiment 1-5
: each component is weighed according to the ratio；Gelatine is poured into the reaction vial equipped with gauge water, reaction vial is placed in 80 DEG C
30min is stirred in thermostat water bath, until gelatine is substantially dissolved in water；Reaction temperature is reduced to 70 DEG C, adjusts gelatine solution
PH value sequentially adds hydroxypropyl guar gum and modified starch to after 7.5 in proportion, after mixing evenly, reduces reaction temperature to 55 DEG C,
It is proportionally added into crosslinking agent, constant temperature stirs 30 minutes, and reaction obtained preliminary product after 3.5 hours, and reaction temperature is down to 45
℃；Sulfonated gilsonite is added, stirs 30 minutes, obtains diverting agent thick liquid；Diverting agent thick liquid is poured into and is covered with tinfoil
Height is to be placed in 100 DEG C of thermostatic drying chambers and took out in dry 24 hours weeks, tear tinfoil off, will become solid in 2cm square box
The gelatinous diverting agent of body cuts into the rectangular particle within length 1cm, and it is small to continue to be placed in drying 24 in 100 DEG C of thermostatic drying chambers
When after obtain diverting agent finished product.
When carrying out bearing capacity and sealing ratiod test to the sealing agent that embodiment 1-5 is provided, flow F=1.0ml/min is surveyed
Try temperature: 90 DEG C, artificial core parameter is as shown in table 1.
Table 1
Embodiment 1
A kind of water blanket dissolubility diverting agent, is made of following components in percentage by weight:
At 90 DEG C, the expansion rate of the diverting agent in the present embodiment 1, dissolution time, bearing capacity and sealing ratiod are carried out
Detection.
(1) expansion rate
Diverting agent is immersed in the volume change in 90 DEG C of clear water in 1 hour, as shown in Figure 1, by being calculated, 90
DEG C aqueous solution in, the maximum swelling rate of diverting agent is 21.66%.
Expansion rate calculation formula is (Δ V- Δ VWater)/VDiverting agent, wherein Δ V refers to the overall expansion volume in expansion test test,
ΔVWaterRefer to the swelling volume of water, VDiverting agentRefer to the volume of diverting agent.
(2) dissolubility
Dissolution time of the diverting agent in 90 DEG C of clear water, salt water, 0.5% hydroxypropyl melon sol solution, as shown in table 2:
The dissolution time of 2 diverting agent of table
| Liquid title | Dissolution time, h |
| Clear water | 1.5 |
| Salt water | 2.5 |
| 0.5% hydroxypropyl melon sol solution | 3.5 |
(3) bearing capacity and sealing ratiod
Diverting agent sample is put into rock core Flow Meter, blocking formation conditions are simulated by instrument to test the envelope of diverting agent
Stifled intensity, the pressure data obtained are as shown in table 3:
3 breakthrough pressure of table and sealing ratiod
| Breakthrough pressure, MPa | Sealing ratiod, % |
| 7.8 | 99 |
During the experiment, as liquid constantly pumps note, pressure is gradually risen, breakthrough pressure 7.8MPa, arrives 30min
When pressure rise to 25MPa.Sealing ratiod is 99%.
(4) residue content
5g diverting agent is dissolved completely in 200mL water, is dried after being centrifuged by centrifuge, diverting agent residue is obtained, contains
Amount is 0.05%.
Embodiment 2
A kind of water blanket dissolubility diverting agent, is made of following components in percentage by weight:
At 90 DEG C, the expansion rate of the diverting agent in the present embodiment 2, dissolution time, bearing capacity and sealing ratiod are carried out
Detection.
(1) expansion rate
Diverting agent is immersed in the volume change in 90 DEG C of clear water in 1 hour, as shown in Fig. 2, by being calculated, 90
DEG C aqueous solution in, the maximum swelling rate of diverting agent is 23.74%.
(2) dissolubility
Dissolution time of the diverting agent in 90 DEG C of clear water, salt water, 0.5% hydroxypropyl melon sol solution is investigated, such as 4 institute of table
Show:
The dissolution time of 4 diverting agent of table
| Liquid title | Dissolution time, h |
| Clear water | 2 |
| Salt water | 3 |
| 0.5% hydroxypropyl melon sol solution | 4 |
(3) bearing capacity and sealing ratiod
Diverting agent sample is put into rock core Flow Meter, blocking formation conditions are simulated by instrument to test the envelope of diverting agent
Stifled intensity, the pressure data obtained are as shown in table 5:
5 breakthrough pressure of table and sealing ratiod
| Breakthrough pressure, MPa | Sealing ratiod, % |
| 11 | 98 |
During the experiment, as liquid constantly pumps note, pressure is gradually risen, breakthrough pressure 11MPa, arrives 30min
When pressure rise to 15MPa.Sealing ratiod is 98%.
(4) 5g diverting agent is dissolved completely in 200mL water by residue content, is dried after being centrifuged by centrifuge, is obtained temporarily
Blocking agent residue, content 0.08%.
Embodiment 3
A kind of water blanket dissolubility diverting agent, is made of following components in percentage by weight:
It is examined by investigating expansion rate, 90 DEG C dissolution times, bearing capacity and sealing ratiod of the diverting agent at 90 DEG C to integrate
Examine the performance of diverting agent.
At 90 DEG C, the expansion rate of the diverting agent in the present embodiment 3, dissolution time, bearing capacity and sealing ratiod are carried out
Detection.
(1) expansion rate
Diverting agent is immersed in the volume change in 90 DEG C of clear water in 1 hour, as shown in figure 3, by being calculated, 90
DEG C aqueous solution in, the maximum swelling rate of diverting agent is 26.58%.
(2) dissolubility
Dissolution time of the diverting agent in 90 DEG C of clear water, salt water, 0.5% hydroxypropyl melon sol solution, as shown in table 6:
The dissolution time of 6 diverting agent of table
| Liquid title | Dissolution time, h |
| Clear water | 2 |
| Salt water | 3 |
| 0.5% hydroxypropyl melon sol solution | 4 |
(3) bearing capacity and sealing ratiod
Diverting agent sample is put into rock core Flow Meter, blocking formation conditions are simulated by instrument to test the envelope of diverting agent
Stifled intensity, the pressure data obtained are as shown in table 7:
7 breakthrough pressure of table and sealing ratiod
| Breakthrough pressure, MPa | Sealing ratiod, % |
| 9 | 99 |
During the experiment, as liquid constantly pumps note, pressure is gradually risen, breakthrough pressure 9MPa, when arriving 25min
Pressure rises to 25MPa.Sealing ratiod is 99%.
(4) residue content
5g diverting agent is dissolved completely in 200mL water, is dried after being centrifuged by centrifuge, diverting agent residue is obtained, contains
Amount is 0.08%.
Embodiment 4
A kind of water blanket dissolubility diverting agent, is made of following components in percentage by weight:
At 90 DEG C, the expansion rate of the diverting agent in the present embodiment 4, dissolution time, bearing capacity and sealing ratiod are carried out
Detection, the performance of integrated survey diverting agent.
(1) expansion rate
Diverting agent is immersed in the volume change in 90 DEG C of clear water in 1 hour, as shown in figure 5, by being calculated, 90
DEG C aqueous solution in, the maximum swelling rate of diverting agent is 53.33%.
(2) solubility experiment
Dissolution time of the diverting agent in 90 DEG C of clear water, salt water, 0.5% hydroxypropyl melon sol solution is investigated, such as 8 institute of table
Show:
The dissolution time of 8 diverting agent of table
| Liquid title | Dissolution time, h |
| Clear water | 3 |
| Salt water | 4 |
| 0.5% hydroxypropyl melon sol solution | 5 |
(3) bearing capacity and sealing ratiod
Diverting agent sample is put into rock core Flow Meter, blocking formation conditions are simulated by instrument to test the envelope of diverting agent
Stifled intensity, the pressure data obtained are as shown in table 9:
9 breakthrough pressure of table and sealing ratiod
| Breakthrough pressure, MPa | Sealing ratiod, % |
| 16 | 99 |
During the experiment, as liquid constantly pumps note, pressure is gradually risen, breakthrough pressure 16MPa, arrives 25min
When pressure rise to 25MPa.Sealing ratiod is 99%.
(4) residue content
5g diverting agent is dissolved completely in 200mL water, is dried after being centrifuged by centrifuge, diverting agent residue is obtained, contains
Amount is 0.15%.
Embodiment 5
A kind of water blanket dissolubility diverting agent, is made of following components in percentage by weight:
At 90 DEG C, the expansion rate of the diverting agent in the present embodiment 5, dissolution time, bearing capacity and sealing ratiod are carried out
Detection.
(1) expansion rate
Diverting agent is immersed in the volume change in 90 DEG C of clear water in 1 hour, as shown in figure 5, by being calculated, 90
DEG C aqueous solution in, the maximum swelling rate of diverting agent is 17.65%.
(2) dissolubility
Dissolution time of the diverting agent in 90 DEG C of clear water, salt water, 0.5% hydroxypropyl melon sol solution is investigated, such as 10 institute of table
Show:
The dissolution time of 10 diverting agent of table
| Liquid title | Dissolution time, h |
| Clear water | 1.5 |
| Salt water | 2 |
| 0.5% hydroxypropyl melon sol solution | 2.5 |
(3) bearing capacity and sealing ratiod
Diverting agent sample is put into rock core Flow Meter, blocking formation conditions are simulated by instrument to test the envelope of diverting agent
Stifled intensity, the pressure data obtained are as shown in table 11:
11 breakthrough pressure of table and sealing ratiod
| Breakthrough pressure, MPa | Sealing ratiod, % |
| 7 | 99 |
During the experiment, as liquid constantly pumps note, pressure is gradually risen, breakthrough pressure 7MPa, when arriving 25min
Pressure rises to 25MPa.Sealing ratiod is 99%.
(4) residue content
5g diverting agent is dissolved completely in 200mL water, is dried after being centrifuged by centrifuge, diverting agent residue is obtained, contains
Amount is 0.06%.
Diverting agent is made in embodiment 1-5 formula as follows: weighing each component according to the ratio；Main monomer is poured into dress
In the reaction flask for having weighed gauge water, 75 DEG C of constant temperature stirrings, until main monomer is substantially dissolved in water；Reaction temperature is reduced to 65
After DEG C, the pH value of main monomer solution is adjusted to 7, secondary monomer is added, when secondary monomer is hydroxypropyl guar gum and modified starch in proportion
Successively sequentially add hydroxypropyl guar gum, modified starch；Reaction temperature is reduced to 50 DEG C, is proportionally added into crosslinking agent, constant temperature stirring
After 20min, preliminary product is obtained within isothermal reaction 3 hours；Reaction temperature is down to 40 DEG C, is proportionally added into quantitative water-proofing agent,
Stirring is to obtaining diverting agent thick liquid；Diverting agent thick liquid is poured into the square box for being covered with tinfoil, is placed in 100 DEG C
Dry 24 hours weeks took out in thermostatic drying chamber, tear tinfoil off, the diverting agent for becoming solid colloidal is cut within length 1cm
Rectangular particle, continue to be placed in 100 DEG C of thermostatic drying chambers it is 24 hours dry after obtain diverting agent finished product.Diverting agent obtained
In 90 DEG C of aqueous solution, maximum swelling rate is all larger than 17%；At 90 DEG C in dissolution time in clear water between 1.5h~3h, 90
At DEG C in dissolution time in salt water between 2~4h, dissolution time exists in 0.5% hydroxypropyl melon sol solution at 90 DEG C
Between 2.5~5h；Breakthrough pressure is in 7.5MPa or more, and sealing ratiod is 98% or more；5g diverting agent is dissolved completely in
Diverting agent residue content is respectively less than 1% in 200mL water.
Diverting agent is made in embodiment 1-5 formula as follows: weighing each component according to the ratio；Main monomer is poured into dress
In the reaction flask for having weighed gauge water, 85 DEG C of constant temperature stirrings, until main monomer is substantially dissolved in water；Reaction temperature is reduced to 65
After DEG C, the pH value of main monomer solution is adjusted to 7, secondary monomer is added, when secondary monomer is hydroxypropyl guar gum and modified starch in proportion
Successively sequentially add hydroxypropyl guar gum, modified starch；Reaction temperature is reduced to 50 DEG C, is proportionally added into crosslinking agent, constant temperature stirring
After 20min, preliminary product is obtained within isothermal reaction 3 hours；It is proportionally added into quantitative water-proofing agent, is stirred sticky to diverting agent is obtained
Liquid；Diverting agent thick liquid is poured into the square box for being covered with tinfoil, it is small to be placed in 100 DEG C of thermostatic drying chambers dry 24
When week take out, tear off tinfoil, the diverting agent for becoming solid colloidal is cut into the rectangular particle within length 1cm, continues to place
Diverting agent finished product is obtained after 24 hours dry in 100 DEG C of thermostatic drying chambers.It is maximum in 90 DEG C of diverting agent of aqueous solution obtained
Expansion rate is all larger than 17%；Dissolution time in clear water is between 1.5h~3h at 90 DEG C, when being dissolved in salt water at 90 DEG C
Between between 2~4h, at 90 DEG C in 0.5% hydroxypropyl melon sol solution dissolution time between 2.5~5h；Breakthrough pressure
In 7.5MPa or more, sealing ratiod is 98% or more；5g diverting agent is dissolved completely in diverting agent residue content in 200mL water
Respectively less than 1%.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of water solubility diverting agent, it is characterised in that:
By weight percentage, it is prepared from the following components:
Wherein, the crosslinking agent is glutaraldehyde；
The pair monomer is hydroxypropyl guar gum and modified starch；
The main monomer is gelatine,
The water-proofing agent is sulfonated gilsonite.
2. water solubility diverting agent according to claim 1, it is characterised in that: the matter of the hydroxypropyl guar gum and modified starch
Amount is than being 3:1~1:1.
3. water solubility diverting agent according to claim 1, it is characterised in that: the modified starch is carboxymethyl starch.
4. a kind of preparation method of the described in any item water-soluble diverting agents of claim 1-3, it is characterised in that: including walking as follows
It is rapid:
1) each component is weighed according to the ratio；
2) main monomer is poured into the reaction flask equipped with weighed gauge water, 75-85 DEG C of constant temperature stirring, until main monomer sufficiently dissolves
In water；
3) reaction temperature is reduced to after 65~75 DEG C, the pH value of solution is adjusted to 7~8 and secondary monomer is added, and secondary monomer is hydroxypropyl
When base guar gum and modified starch, hydroxypropyl guar gum, modified starch are successively sequentially added in proportion, until secondary monomer sufficiently dissolves and is
It can；
4) reaction temperature is reduced to 40~50 DEG C, is proportionally added into crosslinking agent, after constant temperature stirs 20~40min, isothermal reaction 3~
Obtain preliminary product within 4 hours；
5) it is proportionally added into quantitative water-proofing agent, is evenly stirred until to obtain diverting agent thick liquid；
6) diverting agent thick liquid is poured into the square box for being covered with tinfoil, is placed in thermostatic drying chamber dry 24 hour week
It takes out, tears tinfoil off, the diverting agent for becoming solid colloidal is cut into the rectangular particle within length 1cm, continues to be placed in perseverance
Drying obtained diverting agent finished product after 24 hours in warm drying box.
5. the preparation method of water solubility diverting agent according to claim 4, it is characterised in that:
80 DEG C of stirring 20-40min of constant temperature in step 2)；
Reaction temperature is reduced in step 3) to 70 DEG C, secondary monomer is added, reaction temperature is down to 45 DEG C after constant temperature stirs 30min；
The pH value of main monomer solution is adjusted in step 4) to after 7.5, reducing reaction temperature to 55 DEG C, after perseverance reaction 3.5 hours
To preliminary product；
20~40min is stirred in step 5)；
The temperature of thermostatic drying chamber is 100 DEG C in step 6).
6. the preparation method of water solubility diverting agent according to claim 5, it is characterised in that: stirred for 80 DEG C of constant temperature in step 2)
Mix 30min.
7. the preparation method of water solubility diverting agent according to claim 5, it is characterised in that:
30min is stirred in step 5).
8. the preparation method of water solubility diverting agent according to claim 4, it is characterised in that:
Main monomer is added reaction flask and is placed in 80 DEG C of water-baths of constant temperature in step 2)；
Step 2), step 4), feeds in step 5) at step 3) while stirring.
9. the preparation method of water solubility diverting agent according to claim 4, it is characterised in that: square box is high in step 6)
2cm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610361549.2A CN106047323B (en) | 2016-05-26 | 2016-05-26 | A kind of water solubility diverting agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610361549.2A CN106047323B (en) | 2016-05-26 | 2016-05-26 | A kind of water solubility diverting agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106047323A CN106047323A (en) | 2016-10-26 |
| CN106047323B true CN106047323B (en) | 2019-02-15 |
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| CN102020984B (en) * | 2009-09-15 | 2013-07-03 | 中国石油天然气股份有限公司 | In-fissure diversion fracturing temporary blocking agent for low-permeability oilfield, and preparation method and application thereof |
| CN102093864B (en) * | 2010-12-21 | 2013-07-10 | 中国石油天然气股份有限公司 | Temporary plugging diversion agent for refracturing of oil-water well and preparation method thereof |
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Effective date of registration: 20211220 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co., Ltd Address before: No.106 Huanghai Road, Binhai New Economic and Technological Development Zone, Tianjin 300457 Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |