CN104373042A - Method for replacing drilling fluid after gas drilling - Google Patents
Method for replacing drilling fluid after gas drilling Download PDFInfo
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- CN104373042A CN104373042A CN201310338735.0A CN201310338735A CN104373042A CN 104373042 A CN104373042 A CN 104373042A CN 201310338735 A CN201310338735 A CN 201310338735A CN 104373042 A CN104373042 A CN 104373042A
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- drilling
- drilling fluid
- well
- fluid
- gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a method for replacing drilling fluid after gas drilling is finished. The method comprises the steps that after gas drilling is finished, a drill tool is pulled out to the interior of a casing pipe in an upper layer; a wettability reversal agent is injected into a drill rod and a drill bit is rotated to enable the wettability reversal agent to be sprayed to the wall of a well and to flow downwards along the wall of the well until the wettability reversal agent reaches the bottom of the well, so that wettability reversal treatment is carried out on the whole wall of the well; after full treatment, the drill tool downwards runs into the bottom of the well, leaking stoppage spacer fluid and the drilling fluid are injected into the drill rod and slow pulling-out operation is carried out while the drilling fluid is injected at a low discharging rate until the drilling fluid returns to a well opening, so that the replacement work is completed; the drill bit and the drill tool which are suitable for a substratum are sent into the substratum in time to conduct pigging, circulating of the drilling fluid is well done, the wall of the well is repeatedly scratched, and the well is kept clean. According to the method, complex conditions like stratum hydration denudation, collapsing of the wall of the well and leakage loss of the drilling fluid are reduced; the influences of the complex conditions on replacement work and subsequent construction are relieved; and the method for replacing the drilling fluid is safe, simple and economical.
Description
Technical field
The present invention relates to wellbore construction process technical field, specifically a kind of gas drilling terminates the method for rear replacement drilling fluid.
Technical background
Air drilling is fast with its bit speed, be beneficial to protection reservoir, avoid the plurality of advantages such as leakage; applied just widely; but replace after gas drilling terminates in the process of drilling fluid; easily there are the complex situations such as stratum aquation is degraded, cave-in, drilling fluid leakage; give and bring a lot of difficulty for slurry operation and subsequent construction, affect bit speed.How safety successfully carries out drilling fluid replacement is an insoluble problem, and except Reasonable adjustment property of drilling fluid, the replacement technique of science is also very important.
Drilling fluid conventional is at present replaced technique and is comprised direct injection, prepad fluid method and segmentation injection method three kinds.
direct injection be by the drilling fluid that satisfies condition directly by the bottom of drilling rod Injection Well, then return well head from annular space.When arriving shaft bottom under drill bit, if the borehole wall occurs seriously to cave in, will there is drill bit, drilling tool by the risk of burying, the method is applicable to the good stratum of borehole wall stability and uses.
prepad fluid method first in drilling rod, injects one section of wettability reversal insulating liquid or leaking stoppage spacer fluid, and then injects drilling fluid, and drilling fluid displacing prepad fluid returns well head from annular space.Wettability reversal insulating liquid can carry out pretreatment to the borehole wall in advance, makes rock of borehole become oleophylic from hydrophilic, prevents stratum clay hydration swelling, avoids cave-in; Leaking stoppage spacer fluid can shift to an earlier date the lost-circulation zone that shutoff may exist, and reduces drilling fluid leakage.The method should ensure that insulating liquid and drilling fluid have good compatibility, and can not produce mixed slurry phenomenon, in addition, the method still exists drill bit, drilling tool by the risk of burying.
segmentation injection method is on the basis of prepad fluid method, and trip-out and slip casting operation repeatedly hocket, and the drilling fluid of prepad fluid and different densities (or equal densities) is injected in segmentation.The method can according to stratum characteristic and pressure distribution, select drilling fluid density targetedly, be conducive to downhole safety, also reduce drill bit, drilling tool by the risk of burying, but the method needs accurately to calculate the segmentation injection rate of drilling fluid and plays a drilling depth, remain that insulating liquid in annular space is on drilling fluid, because the well amplification degree of gas drilling changes greatly, and may lost-circulation zone be there is, so be difficult to accurately calculate segmentation injection rate and play drilling depth.The method operation relative complex in addition, and the same possibility that there is mixed slurry.
Summary of the invention
The present invention is on the basis of three kinds of method pluses and minuses more than summing up; propose a kind of construct simple, save raw material, be beneficial to well-wall protection, avoid drill bit and drilling tool is terminated the method for rear replacement drilling fluid by the gas drilling burying risk, and wherein the optimum principle of drilling fluid system still traditionally in drilling fluid replacement method is prepared.
Its technical scheme comprises:
Before gas drilling terminates, strengthen gas displacement, after carrying the sand setting in clean shaft bottom, pull out of hole in last layer sleeve pipe;
Reverse wetting agent is injected in drilling rod, and rotary drilling-head, make reverse wetting agent spray on the borehole wall and along the borehole wall toward dirty, until flow to shaft bottom, thus wettability reversal process carried out to the whole borehole wall;
After abundant process, under be drilled into shaft bottom, in drilling rod, inject leaking stoppage spacer fluid and drilling fluid, until drilling fluid returns out well head, complete replacement operation;
And enter at present understratum the drill bit that is suitable for and drilling tool carry out drifting, carry out circulation of drilling fluid, and repeatedly draw and draw a borehole wall, kept well to clean.
Such scheme comprises further:
Pull out of hole at a slow speed inject drilling fluid in drilling rod while.
In drilling rod, adopt small displacement to inject drilling fluid.
Reverse wetting agent is a kind of non-ionic surface active agent, rock surface can be converted to lipophile by hydrophily, and as polymerization alcohols, on-the-spot conventional reverse wetting agent is RSF-1 at present.
In addition; owing to replacing into water-base drilling fluid after gas drilling; the borehole wall does not have the protection of fine and close mud cake; in well slurry, Free water by formation pore, crack, will enter stratum in a large number and promptly, cause mud shale stratum hydration swelling; borehole well instability; therefore, require that the water-base drilling fluid that uses has stronger inhibition, namely replace into drilling fluid be a kind of Strong Inhibitive Drilling Fluids.
The invention has the advantages that:
1. operation is simple, and the engineering time is short.Gas drilling terminates latter direct and gets in last layer sleeve pipe, need not more bit change and drilling tool; In replacement process, marginal not drilling fluid limit pulls out of hole, and decreases the number of times that makes a trip.
2. avoid drill bit, drilling tool by the risk of burying.Rise and get in the sleeve pipe of upper strata, even if there is more serious cave-in, drill bit, drilling tool also can be avoided completely by the risk of burying; In note drilling fluid process, marginal not limit pulls out of hole, and decreases drill bit, drilling tool by the risk of burying.
3. save reverse wetting agent, borehole wall wettability reversal is effective.Spray reverse wetting agent, ensure that its fully contacting and reaction with the borehole wall, avoids mixed generation of starching simultaneously; Even if there is large hole or crack, a large amount of leakages of reverse wetting agent also can not be caused.Wherein the optimum principle of drilling fluid system still traditionally in drilling fluid replacement method is prepared
4. be conducive to protecting the borehole wall.The number of times that makes a trip is few, and first time lower when boring the borehole wall no longer dry, alleviate drilling tool and drill bit destroys the percussion of the borehole wall; Band drill bit note drilling fluid, avoids polish drill rod in conventional replacement method and notes drilling fluid to the impact in shaft bottom.
Accompanying drawing explanation
Fig. 1 is the spray schematic diagram of reverse wetting agent.
In figure: 1 stratum, 2 sleeve pipes, 3 annular spaces, 4 boreholes wall, 5 drilling rods, 6 drill bits, 7 reverse wetting agents, 8 shaft bottoms.
Detailed description of the invention
Now further illustrate technical scheme of the present invention in conjunction with Figure of description:
Exemplary embodiments 1:
As shown in Figure 1, the device that a kind of method of replacing drilling fluid after gas drilling relates to and object have: stratum 1, sleeve pipe 2, annular space 3, the borehole wall 4, drilling rod 5, drill bit 6, reverse wetting agent 7, shaft bottom 8.
Before gas drilling terminates, strengthen gas displacement, after carrying the sand setting in clean shaft bottom 8, pull out of hole in last layer sleeve pipe 2;
Reverse wetting agent 7 is injected in drilling rod 5, and rotary drilling-head 6, make reverse wetting agent spray on the borehole wall 4 and along the borehole wall toward dirty, until flow to shaft bottom 8, thus wettability reversal process carried out to the whole borehole wall;
After abundant process, under get into shaft bottom 8, in drilling rod 5, inject leaking stoppage spacer fluid and drilling fluid, limit small displacement note drilling fluid limit pulls out of hole at a slow speed, until drilling fluid returns out well head, completes replacement operation;
Then and at present enter understratum the drill bit that is suitable for and drilling tool carry out drifting, carry out circulation of drilling fluid, and repeatedly draw and draw a borehole wall, kept well to clean.
Simplified embodiment 2:
Before gas drilling terminates, strengthen gas displacement, after carrying the sand setting in clean shaft bottom 8, pull out of hole in last layer sleeve pipe 2;
Reverse wetting agent 7 is injected in drilling rod 5, and rotary drilling-head 6, make reverse wetting agent spray on the borehole wall 4 and along the borehole wall toward dirty, until flow to shaft bottom 8, thus wettability reversal process carried out to the whole borehole wall;
After abundant process, under get into shaft bottom 8, in drilling rod 5, inject leaking stoppage spacer fluid and drilling fluid, until drilling fluid returns out well head, complete replacement operation;
Then and at present enter understratum the drill bit that is suitable for and drilling tool carry out drifting, carry out circulation of drilling fluid, and repeatedly draw and draw a borehole wall, kept well to clean.
By above-described embodiment, decrease the generation of the complex situations such as stratum aquation is degraded, cave-in, drilling fluid leakage, alleviating complex situations to the impact of replacing operation and subsequent construction, is a kind of safe, simple and easy, economic drilling fluid replacement method.
Claims (5)
1. replace a method for drilling fluid after gas drilling, it is characterized in that comprising:
Before gas drilling terminates, strengthen gas displacement, after carrying the sand setting of clean shaft bottom (8), pull out of hole in last layer sleeve pipe (2);
Inject reverse wetting agent (7) toward in drilling rod (5), and rotary drilling-head (6), reverse wetting agent is sprayed at the borehole wall (4) upper and along the borehole wall toward dirty, until flow to shaft bottom (8), thus carry out wettability reversal process to the whole borehole wall;
After abundant process, under be drilled into shaft bottom (8), in drilling rod (5), inject leaking stoppage spacer fluid and drilling fluid, until drilling fluid returns out well head, complete replacement operation;
And enter at present understratum the drill bit that is suitable for and drilling tool carry out drifting, carry out circulation of drilling fluid, and repeatedly draw and draw a borehole wall, kept well to clean.
2. replace the method for drilling fluid after gas drilling as claimed in claim 1, it is characterized in that: described reverse wetting agent is a kind of non-ionic surface active agent.
3. replace the method for drilling fluid after gas drilling as claimed in claim 1, it is characterized in that: described drilling fluid is Strong Inhibitive Drilling Fluids.
4. replace the method for drilling fluid after gas drilling as claimed in claim 1, it is characterized in that: pull out of hole at a slow speed inject drilling fluid in drilling rod (5) while.
5. replace the method for drilling fluid after gas drilling as claimed in claim 2, it is characterized in that: in drilling rod (5), adopt small displacement to inject drilling fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338735.0A CN104373042A (en) | 2013-08-06 | 2013-08-06 | Method for replacing drilling fluid after gas drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310338735.0A CN104373042A (en) | 2013-08-06 | 2013-08-06 | Method for replacing drilling fluid after gas drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104373042A true CN104373042A (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310338735.0A Pending CN104373042A (en) | 2013-08-06 | 2013-08-06 | Method for replacing drilling fluid after gas drilling |
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| CN (1) | CN104373042A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112608724A (en) * | 2020-12-16 | 2021-04-06 | 成都西油华巍科技有限公司 | Gel spacer fluid for oil and gas fields and preparation method thereof |
| CN114761660A (en) * | 2019-10-11 | 2022-07-15 | Canopus知识产权基金会 | Directional drilling method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710863A1 (en) * | 1994-11-04 | 1996-05-08 | Koninklijke KPN N.V. | Installing cable-ducts |
| US5695010A (en) * | 1995-08-02 | 1997-12-09 | Hongo Company Limited | Method of drilling around an existing casing pipe to regenerate an old well |
| CN101275071A (en) * | 2008-05-09 | 2008-10-01 | 中国石油天然气集团公司 | Water-based collapse-proof drilling fluid |
| CN101319136A (en) * | 2007-06-07 | 2008-12-10 | 中国石油化工股份有限公司 | Ahead fluid for gas-liquid conversion artesian well and its use method |
-
2013
- 2013-08-06 CN CN201310338735.0A patent/CN104373042A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710863A1 (en) * | 1994-11-04 | 1996-05-08 | Koninklijke KPN N.V. | Installing cable-ducts |
| US5695010A (en) * | 1995-08-02 | 1997-12-09 | Hongo Company Limited | Method of drilling around an existing casing pipe to regenerate an old well |
| CN101319136A (en) * | 2007-06-07 | 2008-12-10 | 中国石油化工股份有限公司 | Ahead fluid for gas-liquid conversion artesian well and its use method |
| CN101275071A (en) * | 2008-05-09 | 2008-10-01 | 中国石油天然气集团公司 | Water-based collapse-proof drilling fluid |
Non-Patent Citations (1)
| Title |
|---|
| 胡家森，蒋铭坤: "川东北气液转换技术探索", 《钻采工艺》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114761660A (en) * | 2019-10-11 | 2022-07-15 | Canopus知识产权基金会 | Directional drilling method and system |
| CN112608724A (en) * | 2020-12-16 | 2021-04-06 | 成都西油华巍科技有限公司 | Gel spacer fluid for oil and gas fields and preparation method thereof |
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Application publication date: 20150225 |