CN1236007C - Weight additive in use for drilling fluid providing protection effect for oil layer - Google Patents
Weight additive in use for drilling fluid providing protection effect for oil layer Download PDFInfo
- Publication number
- CN1236007C CN1236007C CN 200310102217 CN200310102217A CN1236007C CN 1236007 C CN1236007 C CN 1236007C CN 200310102217 CN200310102217 CN 200310102217 CN 200310102217 A CN200310102217 A CN 200310102217A CN 1236007 C CN1236007 C CN 1236007C
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- Prior art keywords
- drilling fluid
- agent
- oil
- active agent
- oil layer
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- Earth Drilling (AREA)
Abstract
The present invention relates to a weighing agent for drilling fluid, which can protect oil layers. The weighing agent for drilling fluid mainly solves the problem that materials of the existing weighing agent of drilling fluid pollute the oil layers. The weighing agent for drilling fluid is characterized in that weighing agent contains 94 wt% to 96 wt% of calcium carbonate mineral powder, 3 wt% to 5 wt% of emulsified asphalt and 1 wt% of surface active agent, wherein the surface active agent is oleic acid. The weighing agent for drilling fluid can plug oil layer channels, prevent more harmful solid phases entering the oil layers, reduce the depth of invaded zones, reduce the oil layer pollution, and remove blocks through acidification.
Description
Technical field:
The present invention relates to the used a kind of drilling fluid weighting agent of oil drilling technical field, belong to a kind of drilling fluid weighting agent that oil reservoir is had provide protection.
Background technology:
Oil field used drilling fluid when drilling well divides water-base drilling fluid, oil base drilling well and extraordinary drilling fluid; the function of drilling fluid is many-sided; it can the bottom-hole cleaning, and cutting carring keeps the shaft bottom cleaning; guarantee the constantly broken new stratum of drill bit; avoid the repetition fragmentation, energy balance formation fluid pressure prevents blowout, leakage simultaneously; and prevent the pollution of hydrocarbon zone, protection hydrocarbon zone.High-density weighting material in the drilling fluid plays stifled temporarily effect to the hole of oil reservoir, effectively prevent the destruction of outer bound pair hydrocarbon zone, existing weighting agent material mostly is two kinds, a kind of is ground barium sulfate, it just unilaterally plays drilling fluid and increases the weight of effect, but carry out very difficulty of de-plugging by acidifying when recovering the oil, serious to oil layer pollution; Another kind is a lime carbonate, easy acidification to dispel block when recovering the oil after the brill completion, but because matter is not very tight for tiny oil reservoir hole shutoff firmly, and then to the reservoir protection weak effect.
Summary of the invention:
Oil reservoir there is the deficiency of pollution with the weighting agent material in order to overcome existing drilling fluid; the invention provides a kind of drilling fluid weighting agent that oil reservoir is had provide protection; this weighting agent promptly forms the drilling fluid that oil reservoir is had provide protection after adding drilling fluid; but this weighting agent reservoir plugging passage; prevent that more harmful solid phase from entering oil reservoir; reduce the invaded zone degree of depth, reduce oil layer pollution, and this weighting agent can pass through acidification to dispel block.
The technical solution adopted for the present invention to solve the technical problems is: this drilling fluid that oil reservoir is had provide protection comprises the calcium carbonate mineral powder with weighting agent; the content of calcium carbonate mineral powder accounts for 94%～96% by weight percentage; and add emulsified bitumen and tensio-active agent and its content and account for 3%～5% and 1% by weight percentage respectively, wherein tensio-active agent is an oleic acid.
Above-mentioned oleic acid can be substituted by SP-80 type tensio-active agent.
The invention has the beneficial effects as follows: this drilling fluid that oil reservoir is had provide protection is made up of calcium carbonate mineral powder, emulsified bitumen and tensio-active agent with weighting agent; its medium pitch becomes elastic particle under corresponding temperature; the reservoir plugging passage; prevent that more harmful solid phase from entering oil reservoir; reduce the invaded zone degree of depth; reduce oil layer pollution, tensio-active agent can make the easy de-plugging when acidification to dispel block of this weighting agent.
Embodiment
The present invention is further illustrated below in conjunction with embodiment: this uses weighting agent by the calcium carbonate mineral powder to the drilling fluid that oil reservoir has provide protection, emulsified bitumen and tensio-active agent are formed, its content accounts for 94%～96% respectively by weight percentage, 3%～5% and 1%, above-mentioned each component powder powdered mixing is promptly got this weighting agent, solid phase when oil reservoir left by brill in the drilling fluid enters the oil reservoir hole under pressure, wherein emulsified bitumen becomes elastic particle under corresponding temperature, be deposited in the blowhole oil reservoir passage is carried out shutoff, because bituminous matter is soft under pressure to tiny, crooked blowhole also can stretch into into carries out shutoff, so plugging effect is good, prevent that more harmful solid phase from entering oil reservoir, reduce the invaded zone degree of depth, reduce oil layer pollution, oil reservoir is had provide protection; Pitch belongs to oil-soluble substance, pitch is under the erosion of hydrocarbon zone after boring completion, fall nature and carry out de-plugging according to the similar principle pitch that mixes is dissolved, and the adding of tensio-active agent impels emulsified bitumen easily to dissolve when de-plugging, and the calcium carbonate mineral powder is easily fallen to reach the purpose of de-plugging by acid-respons when carrying out acidification to dispel block.According to the type difference of drilling fluid, the type of added tensio-active agent is also different in weighting agent, and water-base drilling fluid adds oleic acid, and oil base drilling fluid adds SP-80 type tensio-active agent.Use is added with the drilling fluid of this weighting agent, and permeability resume figure improves 15～18%, and the rolling rate of recovery improves 10～15%, and it is anti-collapse to strengthen drilling well simultaneously, improves the weighting agent suspending power, reduces precipitation significantly.
Embodiment 1: Bei1-330-P12Jing is a bite grease hole of grand celebration, during drilling well in the used drilling fluid weighting agent by 1% preparation of calcium carbonate mineral powder 94%+ emulsified bitumen 5%+ tensio-active agent, use is added with the drilling fluid of this high-density weighting material, permeability resume figure improves 15%, and the rolling rate of recovery improves 15%, has strengthened the caving-preventing characteristic of drilling fluid simultaneously, improved the weighting agent suspending power, reduce precipitation significantly, the intact China of drilling well back plugging removal effect is good, and recovery ratio has improved 3%.
Embodiment 2: 66-flat 61 wells in state are a bite grease holes of grand celebration, during drilling well in the used drilling fluid weighting agent by 1% preparation of calcium carbonate mineral powder 95%+ emulsified bitumen 4%+ tensio-active agent, use is added with the drilling fluid of this high-density weighting material, permeability resume figure improves 17%, and the rolling rate of recovery improves 12%, has strengthened the caving-preventing characteristic of drilling fluid simultaneously, improved the weighting agent suspending power, reduce precipitation significantly, the intact China of drilling well back plugging removal effect is good, and recovery ratio has improved 4%.
Embodiment 3: starting flat 33 wells of 57-is a bite grease holes of grand celebration, during drilling well in the used drilling fluid weighting agent by 1% preparation of calcium carbonate mineral powder 96%+ emulsified bitumen 3%+ tensio-active agent, use is added with the drilling fluid of this high-density weighting material, permeability resume figure improves 18%, and the rolling rate of recovery improves 10%, has strengthened the caving-preventing characteristic of drilling fluid simultaneously, improved the weighting agent suspending power, reduce precipitation significantly, the intact China of drilling well back plugging removal effect is good, and recovery ratio has improved 5%.
Claims (2)
1, a kind of drilling fluid weighting agent that oil reservoir is had provide protection; comprise the calcium carbonate mineral powder; it is characterized in that: the content of calcium carbonate mineral powder accounts for 94%～96% by weight percentage; emulsified bitumen and tensio-active agent and its content account for 3%～5% and 1% by weight percentage respectively, and wherein tensio-active agent is an oleic acid.
2, according to claim 1 have the drilling fluid weighting agent of provide protection to oil reservoir, it is characterized in that: oleic acid can be substituted by SP-80 type tensio-active agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310102217 CN1236007C (en) | 2003-10-27 | 2003-10-27 | Weight additive in use for drilling fluid providing protection effect for oil layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310102217 CN1236007C (en) | 2003-10-27 | 2003-10-27 | Weight additive in use for drilling fluid providing protection effect for oil layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1539911A CN1539911A (en) | 2004-10-27 |
| CN1236007C true CN1236007C (en) | 2006-01-11 |
Family
ID=34333138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310102217 Expired - Fee Related CN1236007C (en) | 2003-10-27 | 2003-10-27 | Weight additive in use for drilling fluid providing protection effect for oil layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1236007C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101595197B (en) * | 2006-09-11 | 2014-01-22 | M-I有限公司 | Precipitated weighting agents for use in wellbore fluids |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2021308313A1 (en) * | 2020-07-16 | 2023-02-23 | Omya International Ag | Alkaline earth metal minerals as carriers for surfactants in drilling fluids |
-
2003
- 2003-10-27 CN CN 200310102217 patent/CN1236007C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101595197B (en) * | 2006-09-11 | 2014-01-22 | M-I有限公司 | Precipitated weighting agents for use in wellbore fluids |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1539911A (en) | 2004-10-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060111 Termination date: 20091127 |