CN102086390B - Solidfree well killing fluid for acidic oil-gas reservoir - Google Patents

Solidfree well killing fluid for acidic oil-gas reservoir Download PDF

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CN102086390B
CN102086390B CN 200910241446 CN200910241446A CN102086390B CN 102086390 B CN102086390 B CN 102086390B CN 200910241446 CN200910241446 CN 200910241446 CN 200910241446 A CN200910241446 A CN 200910241446A CN 102086390 B CN102086390 B CN 102086390B
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well control
control fluid
fluid
product
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CN102086390A (en
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吴锦平
崔有明
杨升峰
韩新宇
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Anton Oilfield Services Group Ltd
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Anton Oilfield Services Group Ltd
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Abstract

The invention discloses a solidfree well killing fluid for an acidic oil-gas reservoir, belonging to the field of petroleum and natural gas exploration and development. The solidfree well killing fluid disclosed by the invention is prepared from the following components: 2.0-3.0% of tackifier, 1.5-2.0% of fluid loss additive, 2.0-3.0% of oil layer protecting agent, 0.5-1.0% of anti-swelling agent, a weight agent for regulating the specific gravity of the well killing liquid within 1.57-1.80g/cm<3> and the balance of water. The well killing fluid disclosed by the invention reduces the cost and the corrosion on underground devices such as pipelines and the like, still can keep excellent performance under a high temperature environment, and is suitable for the exploitation of the acidic oil-gas reservoir.

Description

The non-fixed phase well control fluid that is used for the sour oil gas reservoir
Technical field
The present invention relates to a kind of well control fluid that uses when the petroleum and natural gas exploratory development, particularly a kind of non-fixed phase well control fluid that uses when the sour oil gas reservoir is developed.
Background technology
Be to guarantee the Efficient Development of oil-gas field, Reasonable Protection reservoir and safety in production need, and greater than 1.0 the time, will use the well control fluid of rational density when the reservoir pressure coefficient in operation process.But for the sour oil gas reservoir, also there is no at present cost-effective high temperature resistance high specific gravity non-fixed phase well control fluid system.
The key of preparation high temperature high specific gravity non-fixed phase well control fluid is weighting agent, and in Killing Fluid System, the cost of weighting agent accounts for 90% left and right.In order to obtain high specific gravity (proportion＞1.56g/cm 3) non-fixed phase well control fluid, prior art generally adopts the organic salt cesium formate as weighting agent.The maximum specific weight of cesium formate can reach 2.3g/cm 3, but that it has is expensive, the source of goods is limited and unstable, numerous unfavorable factors such as procurement cycle is long.Well control fluid cost with the cesium formate preparation is very high, becomes an obstacle of marketing.
In addition, with producing a large amount of foams in the process of cesium formate preparation Killing Fluid System, need extra operation to defoam, causing configuring well control fluid wastes time and energy, and this problem also becomes the factor that restriction cesium formate well control fluid is promoted.
Because the content of sour gas in the sour oil gas reservoir is higher, Cl -Introducing can aggravate the corrosion of underground equipment, and Ca 2+Introducing can cause precipitation, therefore, need to work out and not contain Cl in a kind of system -, Ca 2+Well control fluid.
Summary of the invention
Main purpose of the present invention is to provide a kind of sour oil gas reservoir that is applicable to, the with low cost and simple high temperature resistance high specific gravity of dosing program non-fixed phase well control fluid.
To achieve these goals, the present invention is by the following technical solutions:
A kind of non-fixed phase well control fluid for the sour oil gas reservoir is formed by following composition configuration:
Tackifier 2.0～3.0%g/cm 3, fluid loss agent 1.5～2.0%g/cm 3, oil layer protective agent 2.0～3.0%g/cm 3, expansion-resisting agent 0.5～1.0%g/cm 3, the proportion of described well control fluid is adjusted to 1.57～1.80g/cm 3Between the weighting agent of amount, surplus is water.
Described weighting agent is synthetic organic salt, and pale yellow powder does not contain Ca 2+, Cl -, the product of Beijing Pei Kangjia industry Technology Dev Company Ltd., product designation weigh4.
Described tackifier are preferably the product of Zhengzhou De Kai Chemical Industry Science Co., Ltd, and product designation DKKJ-1 is the natural modified product of middle polymer.
Described fluid loss agent is preferably the product into Beijing grand diligent petroleum assistant company limited, and product designation HQJL is the high-temperature resisting and salt-resisting fluid loss agent, includes the high temperature resistance group, has certain colloidality energy that protects.
Described oil layer protective agent is preferably the product of Zhengzhou De Kai Chemical Industry Science Co., Ltd, and product designation DKMS is long-chain poly-hydroxy alcohols.
Described expansion-resisting agent is preferably Zhengzhou De Kai Chemical Industry Science Co., Ltd, and product designation DKYB is high temperature resistant expansion-resisting agent.
The compound method of described non-fixed phase well control fluid for the sour oil gas reservoir, step is as follows:
1) according to amount and the proportion of required well control fluid, prepare weighting agent, tackifier, fluid loss agent, oil layer protective agent and expansion-resisting agent according to the well control fluid formula;
2) injected water in mud dosing pond, add weighting agent under the whipped state of 3000 rev/mins (rotating speed of following whipped state is constant), is mixed with the well control fluid base fluid;
3) when stirring, utilize hydraulic jet pump to add tackifier in the dosing pond, tackifier are uniformly dissolved, occur without micelle;
4) add fluid loss agent under whipped state, stir;
5) continue to add oil layer protective agent under whipped state, stir;
6) add expansion-resisting agent at last under whipped state, after stirring, namely obtain the non-fixed phase well control fluid for the sour oil gas reservoir.
Beneficial effect of the present invention is:
The weighting agent that the present invention adopts can not produce bubble in the process of preparation well control fluid, therefore cesium formate is made weighting agent relatively, has saved operation and the cost of preparation.With the well control fluid of weighting agent with the identical proportion of cesium formate preparation, save cost and be approximately 50～60%.
The tackifier that the present invention adopts and fluid loss agent 180 ℃ of heat roll aging after, the apparent viscosity of Killing Fluid System and filter loss all can reach quality standards, the requirement of high temperature resistance in the time of can satisfying actual use.
Owing to not containing Cl in the present invention's Killing Fluid System used -, Ca 2+, the corrosion that has therefore greatly slowed down the underground equipments such as tubing, and can be because of Ca 2+Introducing and cause precipitation, satisfy the requirement of acid gas reservoir well control fluid.
When solving the problems such as poor high temperature stability, solid phase pollution reservoir, discarded contamination of working fluid environment, more can reduce the generation of the down-hole complex accident in the rig-site utilization process, be a kind of good environmental protection and safety type well control fluid.
Embodiment
Embodiment 1
One, well control fluid formula
1) weighting agent: synthetic organic salt, pale yellow powder does not contain Ca 2+, Cl -, requiring to carry out the dosage adjustment according to on-the-spot different proportions, the relation of concrete dosage and proportion can be referring to table 1:
Table 1 well control fluid proportion and weighting agent add the relationship between quantities
Preparation density d (g/cm 3) 1.58 ?1.61 ?1.65 ?1.71 ?1.75 ?1.80
Weighting agent dosage (ton/m 3Well control fluid) 0.9029 ?0.9745 ?1.0331 ?1.1861 ?1.3733 ?1.6195
2) tackifier DKKJ-1: Zhengzhou De Kai Chemical Industry Science Co., Ltd provides, the natural modified product of middle polymer, and salt resistance is good, and dosage 2.0～3.0% is namely prepared 1 side's well control fluid and need be added 0.02 ton of tackifier, and is lower same;
3) fluid loss agent, Beijing grand diligent petroleum assistant company limited includes the high temperature resistance group, has certain colloidality energy, dosage 1.5～2.0% of protecting;
4) oil layer protective agent DKMS, Zhengzhou De Kai Chemical Industry Science Co., Ltd provides, and is long-chain poly-hydroxy alcohols, dosage 2.0～3.0%;
5) expansion-resisting agent, Zhengzhou De Kai Chemical Industry Science Co., Ltd provides, and is high temperature resistant expansion-resisting agent, and dosage is 0.5～1.0%.
Two, well control fluid collocation method
Concrete process for preparation is:
1) according to the amount of required well control fluid and proportion (with 100m 3, proportion 1.61g/cm 3Be example), prepare weighting agent, tackifier, fluid loss agent, oil layer protective agent and expansion-resisting agent according to the well control fluid formula;
2) inject clear water 63.55m in mud dosing pond 3, add 97.45 tons of weighting agents under whipped state, be mixed with proportion 1.61g/cm 3The well control fluid base fluid;
3) when stirring with the speed of 3000 rev/mins, utilize hydraulic jet pump to add 3.0 tons of tackifier in the dosing pond, tackifier are uniformly dissolved, occur without micelle;
4) add 2.0 tons of fluid loss agents under whipped state, stir;
5) continue to add 3.0 tons of oil layer protective agents under whipped state, stir;
6) add at last 0.5 ton of expansion-resisting agent under whipped state, stir;
7) fully can directly the preparation well control fluid be used for kill-job, workover treatment after stirring.
Three, the Performance Detection of well control fluid
Above-mentioned well control fluid is carried out comprehensive performance evaluation, and performance index have reached the requirement of " Q/CYADA020-2008ADYJ non-fixed phase well control fluid " standard.Concrete property indices such as table 2:
Table 2 well control fluid performance index
Figure G2009102414462D00031
By the table in data can find out, through 180 ℃ of heat roll aging after, well control fluid of the present invention still can keep original performance, can satisfy the hot environment in practical application.

Claims (1)

1. a non-fixed phase well control fluid that is used for the sour oil gas reservoir, is characterized in that, formed by following composition configuration:
Tackifier 2.0～3.0%g/cm 3, fluid loss agent 1.5～2.0%g/cm 3, oil layer protective agent 2.0～3.0%g/cm 3, expansion-resisting agent 0.5～1.0%g/cm 3, the proportion of described well control fluid is adjusted to 1.57～1.80g/cm 3Between the weighting agent of amount, surplus is water;
Described weighting agent is the product of Beijing Pei Kangjia industry Technology Dev Company Ltd., product designation weigh4;
Described tackifier are the product of Zhengzhou De Kai Chemical Industry Science Co., Ltd, product designation DKKJ-1;
Described fluid loss agent is the product of Beijing grand diligent petroleum assistant company limited, product designation HQJL;
Described oil layer protective agent is the product of Zhengzhou De Kai Chemical Industry Science Co., Ltd, product designation DKMS;
Described expansion-resisting agent is the product of Zhengzhou De Kai Chemical Industry Science Co., Ltd, product designation DKYB;
Described non-fixed phase well control fluid is prepared by following compound method:
1) according to amount and the proportion of required well control fluid, prepare weighting agent, tackifier, fluid loss agent, oil layer protective agent and expansion-resisting agent according to the well control fluid formula;
2) injected water in mud dosing pond, add weighting agent under the whipped state of 3000 rev/mins, is mixed with the well control fluid base fluid;
3) utilize hydraulic jet pump to add tackifier under whipped state in the dosing pond, tackifier are uniformly dissolved, occur without micelle;
4) add fluid loss agent under whipped state, stir;
5) continue to add oil layer protective agent under whipped state, stir;
6) add expansion-resisting agent at last under whipped state, after stirring, namely obtain the non-fixed phase well control fluid for the sour oil gas reservoir;
Wherein, the relation of the proportion of required well control fluid and weighting agent dosage is as follows:
Preparation density d (g/cm 3) 1.58 1.61 1.65 1.71 1.75 1.80
Weighting agent dosage (ton/m 3Well control fluid) 0.9029 0.9745 1.0331 1.1861 1.3733 1.6195.
CN 200910241446 2009-12-02 2009-12-02 Solidfree well killing fluid for acidic oil-gas reservoir Active CN102086390B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103694971B (en) * 2013-12-18 2016-03-02 安东石油技术（集团）有限公司 A kind of non-fixed phase well control fluid and preparation method thereof
CN104099070A (en) * 2014-05-16 2014-10-15 西南石油大学 Solid free well killing fluid using salt extraction waste brine as base liquid and preparation method thereof
CN104449604A (en) * 2014-06-26 2015-03-25 武志学 Solid-free well control fluid for borehole operation for low permeability reservoir and preparation method of solid-free well control fluid
CN104232033B (en) * 2014-09-15 2017-05-10 北京博达石科科技开发有限公司 Multifunctional type high-temperature-resistant composite well control fluid and preparation method and applications thereof
CN106566489B (en) * 2016-10-19 2020-09-22 中国石油化工股份有限公司 High-acidity gas reservoir water-based microbubble well killing fluid

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN101074364A (en) * 2006-05-18 2007-11-21 大庆浩拓化工有限公司 Efficient multifunctional clay anti-expension stabilizer for injecting water and its production
CN101255332A (en) * 2008-03-28 2008-09-03 安东石油技术（集团）有限公司 Solid-free high temperature resistant petroleum oil well completion working liquid
CN101555404A (en) * 2009-05-20 2009-10-14 大庆开发区东油新技术有限公司 Environment-friendly low-damage solidfree well control fluid and applications thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101074364A (en) * 2006-05-18 2007-11-21 大庆浩拓化工有限公司 Efficient multifunctional clay anti-expension stabilizer for injecting water and its production
CN101255332A (en) * 2008-03-28 2008-09-03 安东石油技术（集团）有限公司 Solid-free high temperature resistant petroleum oil well completion working liquid
CN101555404A (en) * 2009-05-20 2009-10-14 大庆开发区东油新技术有限公司 Environment-friendly low-damage solidfree well control fluid and applications thereof

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