CN107558974A - A kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology - Google Patents
A kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology Download PDFInfo
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- CN107558974A CN107558974A CN201710783891.6A CN201710783891A CN107558974A CN 107558974 A CN107558974 A CN 107558974A CN 201710783891 A CN201710783891 A CN 201710783891A CN 107558974 A CN107558974 A CN 107558974A
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Abstract
The invention discloses a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology, wherein the mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation is：CO2：200 ~ 2000 t, thinner：0 ~ 7 t, foaming agent：0 ~ 1.7 t, bactericide：0 ~ 0.1 t, corrosion inhibiter：0‑0.7 t；And also disclose and horizontal wells in heavy oil reservoir precipitation yield-increasing technology step is implemented using said mixture.The technology can effectively reduce viscosity of thickened oil, improve oil well output and production efficiency and site operation is convenient, the cycle is short, and cost is low.
Description
Technical field
The invention belongs to oil and gas exploitation field, specifically, being to reduce thick oil horizontal well by adding mixture
It is aqueous, to improve the oil production of thick oil horizontal well, so as to improve the technology of recovery factor of heavy oil reservoir.
Background technology
With the sharp increase of world oil dosage, conventional oil reserves are constantly reduced.For the energy supply of keeping tensions down, viscous crude
Shared ratio is increasing in exploitation.Generally viscous crude possesses preferable mobility under reservoir conditions, but
In production process due to temperature, pressure change and need to overcome the influence of gravity and friction, usual viscosity of crude can increase
Cause flow difficulties, can not smoothly give rise to ground.
For stratum viscosity reduction and the viscosity reducing aspect of crude oil, substantial amounts of research work is carried out both at home and abroad, has commonly used
Viscous crude stratum viscosity reducing process mainly have：Steam drive, steam soak, combustion in situ, the drive of hot mixed phase etc.；Conventional viscosity reducing
Method mainly has：Pit shaft chemical viscosity reduction, pit shaft heating power viscosity reduction and pit shaft mix dilute viscosity reduction etc..Found by literature survey, due to
Jamin effect, seepage flow resistance in reservoir pore flow event be present in the emulsion that water-emulsifiable thinner acts on viscous crude formation
Power is larger, therefore selects suitable thinner to be acted synergistically with CO2 to reduce viscosity of thickened oil.But how to seek to drop in practice
Optimal production technology between stick and CO2, it is that current urgent need solves to improve viscous crude to improve recovery ratio in the mobility of pit shaft
Problem.
The content of the invention
The present invention is directed to existing existing issue, there is provided a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology, improves viscous crude oil
Horizontal well oil production is hidden, reduces the aqueous of thick oil horizontal well, improves recovery ratio, and realizes that benefit is developed.
The technical solution adopted in the present invention is：
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：200 ~ 2000 t, thinner：0 ~ 7 t, foaming
Agent：0 ~ 1.7 t, bactericide：0 ~ 0.1 t, corrosion inhibiter：0-0.7 t.
Using a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology of said mixture, comprise the following steps that：
(a) according to designed mixture, thinner, foaming agent, bactericide, corrosion inhibiter are weighed respectively, and mix and stir
Mix uniformly；
(b) CO2 is weighed, using pipeline injection CO2 is injected, simultaneously will（a）Mixture is added in injection pipeline in step, with
CO2 is simultaneously in Injection Level well shaft, into stratum；The t/d of injection rate 90 ~ 140, injection pressure 3 ~ 7.2 MPa；
(c) after injection terminates, horizontal well boils in a covered pot over a slow fire well, boils in a covered pot over a slow fire 8 ~ 36 days well time, waits stewing well pressure to be stabilized to 5 MPa, starts open flow
Production.
Further technical scheme of the invention is a kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：
1000 t, thinner：6t, foaming agent：1.48 t, the t of bactericide 0.02, the t of corrosion inhibiter 0.44.
Using a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology of said mixture, comprise the following steps that：
(a) according to designed mixture, thinner, foaming agent, bactericide, corrosion inhibiter are weighed respectively, and mix and stir
Mix uniformly；
(b) CO2 is weighed, using pipeline injection CO2 is injected, simultaneously will（a）Mixture is added in injection pipeline in step, with
CO2 is simultaneously in Injection Level well shaft, into stratum；The t/d of injection rate 130, injection pressure 5.2 MPa；
(c) after injection terminates, horizontal well boils in a covered pot over a slow fire well, boils in a covered pot over a slow fire 20 days well time, waits stewing well pressure to be stabilized to 5 MPa, starts open flow life
Production.
Thinner, foaming agent, bactericide, corrosion inhibiter carry by Yangzhou Runda Oilfield Chemicals Co., Ltd. in the present invention
For.
Beneficial effects of the present invention：
（1）This kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology can effectively reduce viscosity of thickened oil, improve oil well output and life
Produce efficiency；
（2）This technology site operation is convenient, and the cycle is short, and cost is low.
Embodiment
Below by non-limiting example, the present invention is expanded on further, understands the present invention.
Embodiment 1
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：1000 t, thinner：6t, foaming agent：1.48
T, the t of bactericide 0.02, the t of corrosion inhibiter 0.44.
Using a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology of said mixture, it is characterised in that specific steps are such as
Under：
(a) according to designed mixture, thinner, foaming agent, bactericide, corrosion inhibiter are weighed respectively, and mix and stir
Mix uniformly；
(b) CO2 is weighed, using pipeline injection CO2 is injected, simultaneously will（a）Mixture is added in injection pipeline in step, with
CO2 is simultaneously in Injection Level well shaft, into stratum；The t/d of injection rate 130, injection pressure 5.2 MPa；
(c) after injection terminates, horizontal well boils in a covered pot over a slow fire well, boils in a covered pot over a slow fire 20 days well time, waits stewing well pressure to be stabilized to 5 MPa, starts open flow life
Production.
Embodiment 2
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：300 t, thinner：0 t, foaming agent：0 t、
The t of bactericide 0, the t of corrosion inhibiter 0.
The t/d of injection rate 90 in step, pressure 3MPa is injected, boil in a covered pot over a slow fire 36 days well time, remaining step is the same as embodiment 1.
Embodiment 3
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：1000 t, thinner：5 t, foaming agent：0 t、
The t of bactericide 0, the t of corrosion inhibiter 0.
CO2 is first injected in step, rear injection（a）Mixture in step, the t/d of injection rate 100, inject pressure 4
MPa, 20 days well time is boiled in a covered pot over a slow fire, remaining step is the same as embodiment 1.
Embodiment 4
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：2000 t, thinner：6 t, foaming agent：0 t、
The t of bactericide 0, the t of corrosion inhibiter 0.
First injected in step（a）Mixture in step, CO2, the t/d of injection rate 100 are injected afterwards, inject pressure 4
MPa, 20 days well time is boiled in a covered pot over a slow fire, remaining step is the same as embodiment 1.
Embodiment 5
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：600 t, thinner：3 t, foaming agent：0 t、
The t of bactericide 0, the t of corrosion inhibiter 0.
First injected in step（a）Mixture in step, CO2, the t/d of injection rate 100 are injected afterwards, inject pressure 4
MPa, 10 days well time is boiled in a covered pot over a slow fire, remaining step is the same as embodiment 1.
Embodiment 6
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：1000 t, thinner：6 t, foaming agent：0 t、
.1 t of bactericide 0, the t of corrosion inhibiter 0.6.
The t/d of injection rate 125 in step, the MPa of pressure 4 is injected, boil in a covered pot over a slow fire 20 days well time, remaining step is the same as embodiment 1.
Embodiment 7
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：1000 t, thinner：5 t, foaming agent：1.3
T .02 t of bactericide 0, the t of corrosion inhibiter 0.45.
First injected in step（a）Mixture in step, CO2, the t/d of injection rate 130 are injected afterwards, inject pressure 5.2
MPa, 20 days well time is boiled in a covered pot over a slow fire, remaining step is the same as embodiment 1.
Embodiment 8
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：300 t, thinner：7 t, foaming agent：1.7
T, the t of bactericide 0, the t of corrosion inhibiter 0.7.
First injected in step（a）Mixture in step, CO2, the t/d of injection rate 130 are injected afterwards, inject pressure 5.2
MPa, 8 days well time is boiled in a covered pot over a slow fire, remaining step is the same as embodiment 1.
Embodiment 9
A kind of mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, CO2：200 t, thinner：2.6 t, foaming agent：1.7
T, the t of bactericide 0, the t of corrosion inhibiter 0.4.
Enter the t/d of speed 140 in step, inject the MPa of pressure 7.2, boil in a covered pot over a slow fire 36 days well time, remaining step is the same as embodiment 1.
Above-described embodiment is applied to emerging one section of heavy crude reservoir experiment of northern pile, the test effect of embodiment 1 is notable, can be effective
Reduction viscosity of thickened oil, improve oil well output and production efficiency；Implement according to the step of embodiment 1, day, oil-producing was by 0.45 before
T/d rises to 9t/d, aqueous to drop to 6% by 94%, and remaining oil-producing only increases by 1 ~ 5t/d embodiment day, and aqueous reduces 10
~50 %。
Claims (3)
- A kind of 1. mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation, it is characterised in that CO2：200 ~ 2000 t, viscosity reduction Agent：0 ~ 7 t, foaming agent：0 ~ 1.7 t, bactericide：0 ~ 0.1 t, corrosion inhibiter：0-0.7 t.
- A kind of 2. mixture for the volume increase of horizontal wells in heavy oil reservoir precipitation according to claim 1, it is characterised in that CO2：1000 t, thinner：6t, foaming agent：1.48 t, the t of bactericide 0.02, the t of corrosion inhibiter 0.44.
- 3. using a kind of horizontal wells in heavy oil reservoir precipitation yield-increasing technology of mixture described in claim 1, it is characterised in that tool Body step is as follows：(a) according to designed mixture, thinner, foaming agent, bactericide, corrosion inhibiter are weighed respectively, and mix and stir Mix uniformly；(b) CO2 is weighed, using pipeline injection CO2 is injected, simultaneously will（a）Mixture is added in injection pipeline in step, with CO2 is simultaneously in Injection Level well shaft, into stratum；The t/d of injection rate 90 ~ 140, injection pressure 3 ~ 7.2 MPa；(c) after injection terminates, horizontal well boils in a covered pot over a slow fire well, boils in a covered pot over a slow fire 8 ~ 36 days well time, waits stewing well pressure to be stabilized to 5 MPa, starts open flow life Production.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911121A (en) * | 2020-09-04 | 2020-11-10 | 中国石油大学(华东) | High-efficiency injection and viscosity reduction method for viscosity reducer of heavy oil reservoir |
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| CN101255788A (en) * | 2008-04-15 | 2008-09-03 | 中国石化集团胜利石油管理局石油开发中心 | Thermochemistry auxiliary reinforced steam flooding method |
| CN104975826A (en) * | 2014-04-03 | 2015-10-14 | 中国石油化工股份有限公司 | Method for improving recovery ratio of super heavy oil reservoir |
| CN105952425A (en) * | 2016-07-11 | 2016-09-21 | 中国石油大学(华东) | Method for improving ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101255788A (en) * | 2008-04-15 | 2008-09-03 | 中国石化集团胜利石油管理局石油开发中心 | Thermochemistry auxiliary reinforced steam flooding method |
| CN104975826A (en) * | 2014-04-03 | 2015-10-14 | 中国石油化工股份有限公司 | Method for improving recovery ratio of super heavy oil reservoir |
| CN105952425A (en) * | 2016-07-11 | 2016-09-21 | 中国石油大学(华东) | Method for improving ordinary heavy oil reservoir recovery ratio by adopting chemical agents to assist CO2 huff and puff |
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| CN111911121A (en) * | 2020-09-04 | 2020-11-10 | 中国石油大学(华东) | High-efficiency injection and viscosity reduction method for viscosity reducer of heavy oil reservoir |
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