CN112662384A - Easily-degradable environment-friendly drilling fluid and preparation method thereof - Google Patents
Easily-degradable environment-friendly drilling fluid and preparation method thereof Download PDFInfo
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- CN112662384A CN112662384A CN202011508154.3A CN202011508154A CN112662384A CN 112662384 A CN112662384 A CN 112662384A CN 202011508154 A CN202011508154 A CN 202011508154A CN 112662384 A CN112662384 A CN 112662384A
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Abstract
The invention provides an easily degradable environment-friendly drilling fluid and a preparation method thereof, wherein the drilling fluid comprises the following components in parts by weight: 2-7 parts of bentonite, 0.03-0.09 part of alkalinity regulator, 0.15-0.66 part of coating agent, 2-10 parts of filtrate reducer, 0.5-1.5 parts of non-fluorescent lubricant, 78-7.5 parts of polymer PE2 and 100 parts of water. The rock debris recovery rate of the easily degradable environment-friendly drilling fluid provided by the invention exceeds 80 percent; the PE cloud point is 62 ℃, the porosity of the mud cake can be effectively blocked, and the permeability recovery value is as high as 78.5%; the toxicity is very weak, and the long-term or unacceptable burden can not be caused to the ecological environment; the salt erosion resistance, calcium resistance and soil erosion resistance are good, and compared with other types of drilling fluids, the environmental-friendly drilling fluid has much better lubricity.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to an easily degradable environment-friendly drilling fluid and a preparation method thereof.
Background
During the petroleum exploration and development process, discharges such as rock debris, drilling fluid and the like can be generated in the drilling construction link; the waste drilling fluid usually contains complex and various chemical agents, such as polymers, heavy metals, inorganic substances and the like, and most of the chemical agents are toxic substances. Once the toxic substances are discharged or leaked into the ecological environment without treatment, the environment can be seriously polluted, and meanwhile, drinking water sources and farming soil can be polluted, so that the human body is harmed, the normal and smooth development of drilling construction can be influenced, and the social and economic benefits can be seriously damaged. Therefore, environmental issues in drilling operations are of great concern.
In recent years, with the continuous progress of oil and gas drilling technology and the close attention of human beings to the problem of ecological environment protection, the requirement on environment-friendly drilling fluid in the process of oil drilling is increasingly urgent; the environment-friendly drilling fluid not only needs to have basic functions of drilling lubrication, well wall stabilization, reservoir protection and the like of the traditional drilling fluid, but also needs to meet the characteristic of environmental friendliness.
However, from the current domestic practical application situation, the research on the environment-friendly drilling fluid is not deep enough, and especially in the aspects of the preparation process, the use conditions and the action mechanism, such as the contradiction between a complex preparation process and process, degradability and stability, higher preparation cost and the like, the problems need to be solved urgently.
In conclusion, in order to meet the requirements of safe and efficient exploration and development of petroleum and natural gas, research and development of an easily degradable environment-friendly drilling fluid is very important, and the drilling fluid is a key technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides an easily degradable environment-friendly drilling fluid and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an easily degradable environment-friendly drilling fluid comprises the following components in parts by weight:
in the technical scheme, the fluid loss additive is a mixture of a fluid loss additive NFG-28 and a fluid loss additive HJK.
Preferably, in the above technical scheme, the fluid loss additive is a mixture of 2-5: 1-3 of a mixture of fluid loss additives NFG-28 and fluid loss additive HJK.
In the above technical scheme, the alkalinity regulator is NaOH.
In the technical scheme, the coating agent is IDH-32.
In the technical scheme, the non-fluorescent lubricant is FDL-2.
Further, in the technical scheme, the easily-degradable environment-friendly drilling fluid also comprises 0.01-9 parts of barite.
In a preferred embodiment, the easily degradable and environment-friendly drilling fluid consists of the following components in parts by weight:
the invention also provides a preparation method of the easily degradable environment-friendly drilling fluid, which comprises the following steps:
s1, weighing the components according to the proportion, adding bentonite and an alkalinity regulator into water, and stirring for reaction to obtain a mixed solution;
s2, under the condition of heating and stirring, sequentially adding a coating agent, a filtrate reducer, a non-fluorescent lubricant and a polymer PE into the mixed solution prepared in the step S1;
and S3, adding barite, and uniformly mixing to obtain the product.
In the above technical scheme, in the step S1, the stirring reaction is specifically, stirring at 900-1500rpm for 1.5-2h at 40-50 ℃, and then standing for 18-24 h.
In the above technical solution, in step S2, the heating and stirring is specifically 1200-1600rpm stirring at 40-50 ℃.
In the above technical solution, in step S3, the mixing speed is 5000-.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides an easily degradable environment-friendly drilling fluid, wherein the rock debris recovery rate of the drilling fluid is over 80 percent and far exceeds the rock debris recovery rate (60 percent) of the conventional drilling fluid;
(2) the PE cloud point of the easily-degradable environment-friendly drilling fluid provided by the invention is 62 ℃, the pores of mud cakes can be effectively blocked, the surface tension of the mud cakes is reduced, and the mud cakes and a saline water system can cooperatively inhibit the clay minerals in a reservoir from expanding, in addition, the recovery results of the core permeability of different drilling fluids are compared, the recovery value of the permeability of the easily-degradable environment-friendly drilling fluid provided by the invention is up to 78.5 percent, the recovery value of the core permeability of the corresponding rock is also kept at a higher value, and the conventional polymer drilling fluid in the prior art is only 53.6 percent, which shows that the easily-degradable environment-friendly drilling fluid provided by the invention has obviously better performance;
(3) the depth of invasion of the easily degradable environment-friendly drilling fluid provided by the invention is smaller, and the side surface proves that the drilling fluid has more obvious protective effect on an oil layer;
(4) the easily degradable environment-friendly drilling fluid provided by the invention has very weak toxicity, has relatively good biodegradability performance no matter in the aspects of chemical effect or biological effect, and does not cause long-term or unacceptable burden to the ecological environment;
(5) the easily degradable environment-friendly drilling fluid provided by the invention has good salt erosion resistance, calcium resistance and soil erosion resistance, and compared with other types of drilling fluids, the environment-friendly drilling fluid has much better lubricity.
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.
The following examples are given for the purpose of illustration only and are not intended to limit the scope of the invention.
All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.
In the examples of the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the examples of the present invention, the terms "apparent viscosity", "plastic viscosity", "static shear", "fluid loss", "high temperature and high pressure fluid loss", and "biological and chemical oxygen demand" are defined as follows:
apparent viscosity: the ratio of the shearing stress to the velocity gradient of the drilling fluid under a certain velocity gradient is expressed by AV and has the unit of mPas;
plastic viscosity: when the drilling fluid is in laminar flow, the sum of various internal friction forces among solid particles, between the solid particles and liquid molecules and between the liquid molecules in the drilling fluid is expressed by 'PV', and the unit is mPas;
static shearing force: strength of the internal gel network when the fluid is in a resting state. Expressed as "S", in Pa;
fluid loss reduction: the water in the drilling fluid is inevitably lost to the stratum through the well wall under the action of pressure difference, so that the drilling fluid loses water, and the unit is ml, which is expressed by API;
high temperature high pressure fluid loss: the water loss of the drilling fluid is under the environment of 3.5MPa and 130 ℃;
biological and chemical oxygen demand: under aerobic conditions, microorganisms or chemical oxidants degrade the amount of oxygen required by the organic matter.
Example 1
The embodiment of the invention provides an easily degradable environment-friendly drilling fluid.
(1) Composition of raw materials
(2) Preparation method
The method comprises the following specific steps:
s1, weighing the components according to the proportion, adding bentonite and an alkalinity regulator into water, stirring at 1200rpm for 1.5h at the temperature of 45 ℃, and then standing for 24h to obtain a mixed solution;
s2, stirring at 45 ℃ and 1500rpm, and sequentially adding the coating agent, the filtrate reducer, the non-fluorescent lubricant and the polymer PE into the mixed solution prepared in the step S1;
and S3, adding barite, and uniformly mixing at 7500rpm to obtain the environment-friendly drilling fluid system A.
Example 2
The embodiment of the invention provides an easily degradable environment-friendly drilling fluid.
(1) Composition of raw materials
(2) Preparation method
The method comprises the following specific steps:
s1, weighing the components according to the proportion, adding bentonite and an alkalinity regulator into water, stirring for 1.5h at the temperature of 45 ℃ and 1000rpm, and then standing for 18h to obtain a mixed solution;
s2, stirring at 45 ℃ and 1200rpm, and sequentially adding the coating agent, the filtrate reducer, the non-fluorescent lubricant and the polymer PE into the mixed solution prepared in the step S1;
and S3, adding barite, and uniformly mixing at 8000rpm to obtain the environment-friendly drilling fluid system B.
Comparative example 1
The embodiment of the invention provides a drilling fluid.
(1) Composition of raw materials
(2) Preparation method
The method comprises the following specific steps:
s1, weighing the components according to the proportion, adding bentonite and an alkalinity regulator into water, stirring at 1200rpm for 1.5h at the temperature of 45 ℃, and then standing for 24h to obtain a mixed solution;
s2, stirring at 45 ℃ and 1500rpm, and sequentially adding the coating agent, the filtrate reducer, the non-fluorescent lubricant and the polymer PE into the mixed solution prepared in the step S1;
and S3, adding barite, and uniformly mixing at 7500rpm to obtain the drilling fluid system C.
The properties of the environment-friendly drilling fluid system a and the environment-friendly drilling fluid system B prepared in examples 1-2 and the drilling fluid system C prepared in comparative example 1 were measured, respectively, and the results are shown in table 1 below.
Table 1 performance results for drilling fluids prepared in examples 1-2 and comparative example 1
From the above table, the environment-friendly drilling fluid prepared by the embodiment of the invention has the advantages of excellent inhibition, lower water loss reduction, good high temperature resistance, good stability and the like, the density can be widely implemented, and meanwhile, the environment-friendly drilling fluid has strong pollution resistance, weak toxicity and good degradability, is beneficial to protecting oil and gas reservoirs, and meets the requirements of drilling production.
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An easily degradable environment-friendly drilling fluid is characterized in that,
comprises the following components in parts by weight:
2. the environment-friendly drilling fluid easy to degrade as claimed in claim 1,
the fluid loss additive is a mixture of a fluid loss additive NFG-28 and a fluid loss additive HJK;
preferably, the fluid loss additive is prepared from 2-5 mass percent: 1-3 of a mixture of fluid loss additives NFG-28 and fluid loss additive HJK.
3. The environment-friendly drilling fluid easy to degrade as claimed in claim 1,
the alkalinity regulator is NaOH.
4. The environment-friendly drilling fluid easy to degrade as claimed in claim 1,
the coating agent is IDH-32.
5. The environment-friendly drilling fluid easy to degrade as claimed in claim 1,
the non-fluorescent lubricant is FDL-2.
6. The degradable environment-friendly drilling fluid according to any one of claims 1 to 5,
also comprises 0.01-9 parts of barite.
7. The degradable environment-friendly drilling fluid according to any one of claims 1 to 6,
the composition consists of the following components in parts by weight:
8. the preparation method of the easily degradable and environment friendly drilling fluid as claimed in any one of claims 1 to 7, characterized in that,
the method comprises the following steps:
s1, weighing the components according to the proportion, adding bentonite and an alkalinity regulator into water, and stirring for reaction to obtain a mixed solution;
s2, under the condition of heating and stirring, sequentially adding a coating agent, a filtrate reducer, a non-fluorescent lubricant and a polymer PE into the mixed solution prepared in the step S1;
and S3, adding barite, and uniformly mixing to obtain the product.
9. The preparation method of the easily degradable environment-friendly drilling fluid according to claim 8,
in step S1, the stirring reaction is specifically, stirring at 900-1500rpm for 1.5-2h at 40-50 ℃, and then standing for 18-24 h.
10. The preparation method of the easily degradable environment-friendly drilling fluid according to claim 8,
in step S2, the heating and stirring is specifically 1200-1600rpm stirring at 40-50 ℃;
and/or, in step S3, the mixing rate is 5000-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011508154.3A CN112662384A (en) | 2020-12-18 | 2020-12-18 | Easily-degradable environment-friendly drilling fluid and preparation method thereof |
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| CN202011508154.3A CN112662384A (en) | 2020-12-18 | 2020-12-18 | Easily-degradable environment-friendly drilling fluid and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009114611A2 (en) * | 2008-03-13 | 2009-09-17 | M-I Drilling Fluids Uk Limited | Viscosity reducer for water-based muds |
| CN105038737A (en) * | 2015-06-29 | 2015-11-11 | 北京中科天启油气技术有限公司 | Strong-inhibition anticaving drilling fluid and application thereof |
| CN106398668A (en) * | 2016-08-31 | 2017-02-15 | 中国石油集团渤海钻探工程有限公司 | Environmentally friendly drilling fluid |
| US20200115613A1 (en) * | 2018-10-15 | 2020-04-16 | Cnpc Engineering Technology R&D Company Limited | Temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and use thereof |
-
2020
- 2020-12-18 CN CN202011508154.3A patent/CN112662384A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009114611A2 (en) * | 2008-03-13 | 2009-09-17 | M-I Drilling Fluids Uk Limited | Viscosity reducer for water-based muds |
| CN105038737A (en) * | 2015-06-29 | 2015-11-11 | 北京中科天启油气技术有限公司 | Strong-inhibition anticaving drilling fluid and application thereof |
| CN106398668A (en) * | 2016-08-31 | 2017-02-15 | 中国石油集团渤海钻探工程有限公司 | Environmentally friendly drilling fluid |
| US20200115613A1 (en) * | 2018-10-15 | 2020-04-16 | Cnpc Engineering Technology R&D Company Limited | Temperature-resistant calcium-resistant water-based drilling fluid for oil and gas reservoir protection and use thereof |
Non-Patent Citations (2)
| Title |
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| 罗云凤等: "新型海洋环保聚合醇钻井液室内性能研究", 《石油钻探技术》 * |
| 鲁江永等: "埕北25GB井组钻井液技术", 《钻井液与完井液》 * |
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Application publication date: 20210416 |