CN104762074A - A polymer-surfactant binary combination well flushing fluid for injection wells and a preparing method thereof - Google Patents
A polymer-surfactant binary combination well flushing fluid for injection wells and a preparing method thereof Download PDFInfo
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- CN104762074A CN104762074A CN201510127737.4A CN201510127737A CN104762074A CN 104762074 A CN104762074 A CN 104762074A CN 201510127737 A CN201510127737 A CN 201510127737A CN 104762074 A CN104762074 A CN 104762074A
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- China
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- flushing fluid
- poly
- injection well
- table binary
- binary drive
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Abstract
A polymer-surfactant binary combination well flushing fluid for injection wells and a preparing method thereof are provided. The method includes following steps: adding a potassium permanganate solution into phosphoric acid, stirring for 20-30 min, allowing the mixture to stand, adding a sulfonate, and stirring for 5-10 min to obtain the polymer-surfactant binary combination well flushing fluid for injection wells, wherein the reaction is performed at 60-70 DEG C, and the mass ratio of the potassium permanganate solution, the phosphoric acid and the sulfonate is 5-8:0.5-1:0.5-1. The polymer-surfactant binary combination well flushing fluid for injection wells, which is obtained by the preparing method, is also provided. The polymer-surfactant binary combination well flushing fluid is simple in preparing process and low in production cost, can fully degrade polyacrylamide, and can completely treat blocking compounds formed by the polyacrylamide.
Description
Technical field
The present invention relates to a kind of flushing fluid and preparation method thereof, particularly a kind of flushing fluid and preparation method thereof of poly-table binary drive injection well, belongs to technical field of petroleum extraction.
Background technology
When ligh-oil reservoir enters mid-later development phase, oil well generally occurred comprehensive moisture content rise and oil well output successively decrease quickening problem.For improving oil well output, ensureing the effect of block exploitation, needing the substituted technique finding exploitation, and changing development scheme.
It is a kind of block implementation result significant oil recovery technique higher at Exploitation degree that poly-table binary is driven.The Main Function mechanism of this technology is the viscosity utilizing Water-soluble Polymer Molecules, improves the mobility ratio of displacing fluid, and utilizes Surfactant to reduce the tension force of water-oil interface, improves efficiency of displacement and swept volume, thus reaches the object improving recovery ratio.
Poly-table binary is driven and is generally adopted polyacrylamide as main flooding polymers, and its method for implanting injects stratum after being mixed with tensio-active agent by polyacrylamide solution.But, viscosity due to polyacrylamide solution is higher and have certain adsorptivity, in long-term injection process, polyacrylamide solution can be caused to be adsorbed on the water nozzle of Injection Well separate injection tubing string and perforation interval borehole and to form blocking, cause poly-table binary to drive the problem that injection pressure raises and injection rate reduces.
At present, the settling mode for blocking water nozzle problem comprises with sewage well-flushing, carries out the mode such as operation process and injection unblocking agent to Injection Well.
The mode of conventional utilization sewage well-flushing cannot play the object thoroughly removing blocking, and coagulates wadding property because polyacrylamide has, and easily forms new blocking; The bothersome effort of mode of by operation water nozzle being cleared up and changing, and running cost is high; Settling mode for blocking perforation interval borehole problem is generally injection unblocking agent, and the method can make unblocking agent enter stratum, and formation damages.
In sum, a kind of unblocking agent that effectively can solve the poly-table binary drive injection well of the problem of polyacrylamide blocking perforation interval borehole is provided to be one of this area problem needing solution badly.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of poly-table binary drive injection well flushing fluid and preparation method thereof, poly-table binary drive injection well flushing fluid effectively can solve the blockage problem of poly-table binary drive injection well, thoroughly can process the tamper that polyacrylamide is formed.
In order to achieve the above object, the invention provides a kind of preparation method of poly-table binary drive injection well flushing fluid, the method comprises the following steps:
Step one: add potassium permanganate solution in phosphoric acid, stirs 20-30min, leaves standstill;
Step 2: add sulfonate, stirs 5-10min, obtains poly-table binary drive injection well flushing fluid;
Described step one and step 2 are carried out at the temperature of 60-70 DEG C, and wherein, the mass ratio of potassium permanganate solution, phosphoric acid and sulfonate is 5-8:0.5-1:0.5-1, and preferred mass is than being 5:1:0.5.
In the preparation method of poly-table binary drive injection well flushing fluid provided by the invention, preferably, the concentration of the potassium permanganate solution of employing is 1500mg/L-1700mg/L; More preferably, the concentration of the potassium permanganate solution of employing is 1500mg/L, 1600mg/L or 1700mg/L; Most preferably, the concentration of the potassium permanganate solution of employing is 1700mg/L.
According to the specific embodiment of the present invention, preferably, in step one, phosphoric acid is stirred 5-10min, then add potassium permanganate solution wherein.
In the preparation method of poly-table binary drive injection well flushing fluid provided by the invention, preferably, in step one, in phosphoric acid, add potassium permanganate solution, stir 20-30min, leave standstill 30min.
In the preparation method of poly-table binary drive injection well flushing fluid provided by the invention, preferably, the mass concentration of the phosphoric acid of employing is 20%-30%.
In the preparation method of poly-table binary drive injection well flushing fluid provided by the invention, preferably, the sulfonate of employing comprises sulfonated petro-leum and/or Sodium dodecylbenzene sulfonate.
Present invention also offers a kind of poly-table binary drive injection well flushing fluid, it is prepared by above-mentioned preparation method.
Present invention also offers a kind of pumping and washing process, completed by above-mentioned poly-table binary drive injection well flushing fluid, the method comprises the following steps:
Step one: inject described poly-table binary drive injection well flushing fluid 4-6m in poly-table binary drive injection well
3;
Step 2: after stewing well 1h, inject sodium hydrogen carbonate solution (preferred mass mark is the sodium hydrogen carbonate solution of 20%-40%), warm water (preferable temperature is 40 DEG C-50 DEG C), wherein, total injection rate of sodium hydrogen carbonate solution and warm water is 30-40m
3, complete poly-table binary drive injection well flushing fluid to the cleaning of poly-table binary drive injection well.According to specific embodiment of the invention scheme, when adopting poly-table binary drive injection well flushing fluid provided by the invention to clean poly-table binary drive injection well, can nubbin solution after polyacrylamide in described flushing fluid and pit shaft reacts, injection liquid can be driven to follow-up binary to have an impact, sodium hydrogen carbonate solution and warm water therefore should be adopted after well-flushing to clean tubing string and pit shaft.
Poly-table binary drive injection well flushing fluid provided by the invention is adopted to carry out well-flushing, reacted with the polyacrylamide be blocked on water nozzle and perforation interval borehole by the flushing fluid of strong oxidizing property, utilize the strong oxidizing property of flushing fluid to carry out degradation treatment to it, reach the object of de-plugging.
The raw material of the preparation method of poly-table binary drive injection well flushing fluid provided by the invention is easy to get, and preparation technology is simple, and production cost is low.
Poly-table binary drive injection well flushing fluid provided by the invention utilizes potassium permanganate strong oxidizing property in an acidic solution, fully degrades to polyacrylamide, more thoroughly processes the tamper that polyacrylamide is formed.
Accompanying drawing explanation
Fig. 1 is the speed of reaction curve that the potassium permanganate solution of different concns in embodiment 1 and polyacrylamide react.
Fig. 2 is the sectional structure chart of the Flushing tubular column of certain Injection Well of embodiment 1.
Main Reference nomenclature:
1 well head injection gate 2 wellhead casing pipe injection gate 3 injects pipeline 4 Injection Well sleeve pipe 5Y441 pkr 6 water nozzle 7 note binary and drives pipeline 8 well-flushing gate 9 well-flushing pipeline
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.
Embodiment 1
First the present embodiment is selected the concentration of the potassium permanganate solution adopted in poly-table binary drive injection well flushing fluid:
2,500 ten thousand are about for the relative molecular weight that poly-table binary drives the polymkeric substance of utilization at present, concentration range is 1400mg/L-2000mg/L (that conventional is 1600mg/L), the concentration that for this reason have chosen 500mL is that the potassium permanganate solution that the polyacrylamide solution of 1600mg/L and the concentration of equivalent are respectively 1500mg/L, 1600mg/L and 1700mg/L reacts, and response curve as shown in Figure 1.
As shown in Figure 1, be that the speed of reaction of the potassium permanganate solution of 1700mg/L is very fast in concentration, residual volume is less.Therefore, the concentration of the potassium permanganate solution adopted in the pumping and washing process of poly-table binary drive injection well flushing fluid that the present embodiment provides is 1700mg/L.
Present embodiments provide a kind of poly-table binary drive injection well flushing fluid, it is prepared by following steps:
Step one: to start and the temperature controlling reactor is 65 DEG C;
Step 2: add in reactor by 150kg phosphoric acid, stirs 5min;
Step 3: add the potassium permanganate solution 500L that concentration is 1700mg/L in reactor, stirs 20min, leaves standstill 30min;
Step 4: add in reactor by 100kg Sodium dodecylbenzene sulfonate, stirs 6 minutes, obtains 5.6m
3poly-table binary drive injection well flushing fluid.
Certain Injection Well 2011.04.23 bets, and this well well depth is 1328.7m, and be divided into two Injection Well sections to inject, the concentration of injection of polymer is 1650mg/L, and injection allocation is 90m
3/ d.The injection pressure recording this well before construction is 15.6MPa, and diurnal injection is 43m
3.By analyzing, this well raises because injection of polymer blocking water nozzle and borehole cause injection pressure the problem reduced with injection rate.
The present embodiment additionally provides the pumping and washing process adopting above-mentioned poly-table binary drive injection well flushing fluid, and when carrying out well-flushing to certain Injection Well above-mentioned, the simple and easy cross-section structure of Flushing tubular column as shown in Figure 2, specifically comprises the following steps:
Injection Well is equipped with Injection Well sleeve pipe 4, with the well of fixing Injection Well;
By 5.6m
3flushing fluid inject gate 1 by well head and flow through wellhead casing pipe and inject gate 2 by injecting pipeline 3 and inject in pit shaft that (pkr is Y344 pkr 5, inject liquid by the external world and can make removing seal for packer) in pit shaft through perforated interval and water nozzle 6, flushing fluid and the polyacrylamide be blocked on borehole and water nozzle are fully reacted; Recirculation well-flushing 40 minutes, stewing well, after 1 hour, injects in gate 2 to wellhead casing pipe and injects sodium hydrogen carbonate solution and warm water, and open well-flushing gate 8, and well-flushing raffinate drives pipeline 7 through water nozzle 6 and note binary and flows back to well head, then flows out from well-flushing gate 8 and well-flushing pipeline 9.
This well enforcement well-flushing on July 30th, 2013, the injection pressure after construction is 11.7MPa, and diurnal injection is promoted to 89m
3, construction effect is remarkable.
2012-2014, adopts the pumping and washing process of poly-table binary drive injection well flushing fluid of the present invention to test 28 wells, average individual well step-down 4.8MPa, average individual well day augmented injection 53m
3after implementing pumping and washing process of the present invention, the injection rate of poly-table binary drive injection well is improved, and reservoir pressure obviously reduces, and this illustrates that poly-table binary drive injection well flushing fluid provided by the invention is a kind of flushing fluid that effectively can solve blockage problem in poly-table binary drive injection well.
Claims (10)
1. a preparation method for poly-table binary drive injection well flushing fluid, the method comprises the following steps:
Step one: add potassium permanganate solution in phosphoric acid, stirs 20-30min, leaves standstill;
Step 2: add sulfonate, stirs 5-10min, obtains poly-table binary drive injection well flushing fluid;
Described step one and step 2 are carried out at the temperature of 60-70 DEG C, and wherein, the mass ratio of described potassium permanganate solution, phosphoric acid and sulfonate is 5-8:0.5-1:0.5-1.
2. preparation method according to claim 1, wherein, the mass ratio of described potassium permanganate solution, phosphoric acid and sulfonate is 5:1:0.5.
3. preparation method according to claim 1 and 2, wherein, the concentration of described potassium permanganate solution is 1500mg/L-1700mg/L; Preferred concentration is 1500mg/L, 1600mg/L or 1700mg/L.
4. preparation method according to claim 1, wherein, in step one, the time left standstill is 30min.
5. preparation method according to claim 1, wherein, the mass concentration of described phosphoric acid is 20%-30%.
6. preparation method according to claim 1, wherein, described sulfonate comprises sulfonated petro-leum and/or Sodium dodecylbenzene sulfonate.
7. a poly-table binary drive injection well flushing fluid, it is obtained by the preparation method described in any one of claim 1-6.
8. a pumping and washing process, it is completed by poly-table binary drive injection well flushing fluid according to claim 7, and the method comprises the following steps:
Step one: inject described poly-table binary drive injection well flushing fluid 4-6m in poly-table binary drive injection well
3;
Step 2: after stewing well 1h, inject sodium hydrogen carbonate solution, warm water, complete poly-table binary drive injection well flushing fluid to the cleaning of poly-table binary drive injection well, wherein, total injection rate of sodium hydrogen carbonate solution and warm water is 30-40m
3.
9. want the pumping and washing process described in 8 according to right, the massfraction of the sodium hydrogen carbonate solution injected in step 2 is 20%-40%.
10. pumping and washing process according to claim 8, in step 2, the temperature of warm water is 40 DEG C-50 DEG C.
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| CN201510127737.4A CN104762074A (en) | 2015-03-23 | 2015-03-23 | A polymer-surfactant binary combination well flushing fluid for injection wells and a preparing method thereof |
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| CN201510127737.4A CN104762074A (en) | 2015-03-23 | 2015-03-23 | A polymer-surfactant binary combination well flushing fluid for injection wells and a preparing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343586A (en) * | 2020-08-19 | 2021-02-09 | 中国石油天然气股份有限公司 | Meter-gathering binary flooding influence factor evaluation method based on numerical simulation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250602A (en) * | 2011-05-06 | 2011-11-23 | 河北科技大学 | Composite acid blockage removing agent for oil well |
-
2015
- 2015-03-23 CN CN201510127737.4A patent/CN104762074A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250602A (en) * | 2011-05-06 | 2011-11-23 | 河北科技大学 | Composite acid blockage removing agent for oil well |
Non-Patent Citations (2)
| Title |
|---|
| 徐伟生，程丽晶: ""聚合物驱油注聚中期解堵试验研究"", 《内蒙古石油化工》 * |
| 王亚洲: ""聚驱井解堵降解剂的优选及性能评价"", 《应用化工》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343586A (en) * | 2020-08-19 | 2021-02-09 | 中国石油天然气股份有限公司 | Meter-gathering binary flooding influence factor evaluation method based on numerical simulation |
| CN112343586B (en) * | 2020-08-19 | 2023-07-25 | 中国石油天然气股份有限公司 | Meter-gathering binary flooding influence factor evaluation method based on numerical simulation |
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Application publication date: 20150708 |