CN102998238A - Method for testing plugging effect of leakage-proof plugging system while drilling - Google Patents
Method for testing plugging effect of leakage-proof plugging system while drilling Download PDFInfo
- Publication number
- CN102998238A CN102998238A CN 201110290285 CN201110290285A CN102998238A CN 102998238 A CN102998238 A CN 102998238A CN 201110290285 CN201110290285 CN 201110290285 CN 201110290285 A CN201110290285 A CN 201110290285A CN 102998238 A CN102998238 A CN 102998238A
- Authority
- CN
- China
- Prior art keywords
- rock core
- pressure
- leak
- permeability
- testing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a method for testing plugging effect of a leakage-proof plugging system while drilling. The method comprises the steps of (a) applying standard salt water to soak a rock core, so as to keep original properties of the rock core to the greatest extent; (b) measuring permeability before plugging; (c) plugging; (d) measuring the permeability after plugging; and (e) carrying out permeability recovery value test. With the adoption of the method provided by the invention, the plugging effect of the leakage-proof plugging agent while drilling can be rapidly tested; the test precision is high, and the test steps are simple; and the test cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of method of testing with boring leak-proof leak-stopping system plugging effect.
Background technology
Leakage is in the various borehole operation processes such as the drilling well of oil, natural gas exploration and development, well cementation, test or well workover, the fluid (comprising drilling fluid, grout, well completion fluid and other working fluid) of work is under the effect of pressure reduction, a kind of down hole problem of leakage in the stratum is one of the most general in the drilling engineering, modal technical barrier.Why claiming that it is a kind of down hole problem, is because its generation majority is not that the people causes, and independent of man's will, certainly, this saying is not accurate enough.If run into the leakage channel that can produce leakage, but taked corresponding effective measures, so just might not can produce leakage, can reduce widely the leakage degree at least.Secondly, even the existing micropore in stratum is unlikely the generation leakage, but when its some measures of taking are not suitable for physical condition, for example operation pressure surpasses the parting pressure on stratum, also can cause severe circulation loss, its visualize descends at ground mud tank liquid level, or wellhead drilling fluid returns output less than the normal discharge capacity of pump, or well head returns out without drilling fluid.
Leakage is one of down hole problem common in the drilling process, and it not only can expend rig time, loss mud, and might cause the series of complex situations such as bit freezing, blowout, well slough, even cause well to be scrapped, cause heavy economic losses.
Namely paid attention to the research of leakage Prevention Technique abroad as far back as the forties; To the fifties, about leakage mechanism and leak-proof leak-stopping research on mechanism, drop ply method of testing and leak-stopping technique technology all have larger development; Carried out lost circulation simulator and leakage research on mechanism 60～seventies, progressively grasped drop ply characteristics and the leakage rule in various leakages area, various blocking methods and leak-stopping technique reach its maturity, and the leak stopping success ratio obviously improves; Developed a series of compound leakage stop agents with reservoir protection effect 80～nineties, the leak stopping success ratio improves again; Paid attention to the theoretical research to leakage, high level has been arrived in the research and development of plugging test equipment, leak stoppage tool.
For improving the drilling well work efficiency, reduce the loss of the working fluids such as activity duration and mud, minimizing to the injury of reservoir etc. obtaining maximum economic benefit, plugging while drilling technique the method that provides that addresses this problem is provided, it is with boring with stifled a kind of leakage stopping technology in drilling engineering.
Drill-feeding plugging agent is domestic and international in recent years development, the good class New Kind of Plugging Agent of result of use.Existing with boring 801 lost circulation additives at present, it is the powder product that forms through the scientific approach complex treatment with multiple macromolecular compounds such as Chinese bandoline wood powder (a kind of timber that contains vegetable gum forms through pulverizing, and it contains cellulose, lignin, poly-pentose etc.), humate, carboxymethyl cellulose.The NFU lost circulation additive, it is composite and be equipped with powdery or the pelletized product that the inert material of different cultivars, different grain size, different dosages forms through scientific approach with multiple macromolecular compounds such as nanmu root powder (a kind of purpleback murdannia herb bushes tree root that contains vegetable gum forms through pulverizing), humic acid high-valency metal salt, starch sodium carboxymethyl, polyacrylamides.The NFDF8012 lost circulation additive, it is through composite powdery or the pelletized product that forms and form with addition of the inert material of difference amount, different grain size, different cultivars of scientific formula, scientific approach with multiple macromolecular compounds such as nanmu root powder, humic acid high-valency metal salt or derivatives thereof, ammonium methylcellulose, polyacrylamide, leather powder.These drill-feeding plugging agents in the geology coalfield in 23 provinces in the whole nation, district, more than 300 unit of the industries such as metallurgy, coloured, nuclear industry, oil, chemical industry, building materials use.
In recent years, very fast in research and the application facet development of leak-proof leak-stopping technology both at home and abroad, developed multiple lost circulation material, developed the drilling fluid system of multiple leak-proof leak-stopping, wherein bridge blinding and gel blocking technology have obtained using more widely.But these methods also do not solve the root problem of leakage, mainly are that bearing capacity is poor.Reason is that the grain size distribution of conventional lost circulation additive is unreasonable, and particle shape is bad with the form fit in the crack of being blocked up, duct, lacks the acting force that stretches into the borehole wall, greatly reduces shutoff efficient.And the hydroexpanding body lost circulation additive can reach this acting force, improves the bearing capacity of the borehole wall.
Existing blocking method respectively has its relative merits, but generally speaking they all more or less delayed rig time, reduced drilling efficiency, need to stop to bore such as static leak stopping method, above-mentioned other each methods have changed the performance of drilling fluid because adding lost circulation material, need readjust the work such as prescription of drilling fluid, all will expend a large amount of time, bring very large inconvenience to drilling well, cause larger economic loss.In this case, research and the application of plugging while drilling are arisen at the historic moment, and it is to be accompanied by the carrying out of drilling well work and to carry out leak stopping, need not stop to bore, and need not adjust working fluid and lose time, really accomplish with bore with stifled with stifled with brill.Being applicable to the leakage situation is not the various leakages of especially severe, if the long section natural horizontal crack on cavern, large fracture, superficial part stratum and the leakage situation of solution cavity then need other leaking-stopping measure or just can resolve the leak stopping problem with other blocking method compound uses.Plugging while drilling is pre-lost circulation prevention well, greatly reduces the stratum and produces the possibility of inducing the crack leakage.
Preventing having unique advantage aspect perviousness and the fractured leakage with boring leak-proof sealing agent SAR.Its less investment, method is simple, do not need to stop bore to process, decrease processing time and the expense of oil gas leakage, for the bit speed that improves the leakage stratum with reduce drilling cost and be significant.
Summary of the invention
Purpose of the present invention is in order to overcome the deficiencies in the prior art and defective, a kind of method of testing with boring leak-proof leak-stopping system plugging effect is provided, and this method of testing can test out fast with the plugging effect that bores leak-proof sealing agent, and measuring accuracy is high, testing procedure is simple, greatly reduces testing cost.
Purpose of the present invention is achieved through the following technical solutions: a kind of method of testing with boring leak-proof leak-stopping system plugging effect may further comprise the steps:
(a) application standard saline sook rock core is to keep to greatest extent the original character of rock core;
(b) measure stifled front permeability;
(c) shutoff;
(d) measure stifled rear permeability;
(e) permeability resume figure test.
In the described step (a), by mass, normal saline solution forms: 2.0%KCl+5.5%NaCl+0.45%MgCl
2+ 0.55%CaCl
2
In the described step (a), with the normal saline solution vacuum outgas 1h for preparing.
In the described step (b), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; The pressure differential at rock core two ends and the flow ml/s of current when the mensuration brine stream is crossed rock core ask its stifled front water phase permeability K
w
In the described step (c), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump is forced into preset pressure; Open constant-flux pump and be forced into preset pressure; Inject displacing fluid at constant pump speed and constant driving under the body pressure, also wait for shutoff writing time, after blocking for the first time more gradually gradient increase displacement pressure, in the hope of the maximum surge pressure of this shutoff experiment, namely forward bears pressure; Release, the rock core taking-up with shutoff oppositely is contained in the core holding unit, and gradient increases displacement pressure gradually again, tries to achieve the maximum aspiration pressure of this shutoff experiment, namely oppositely bears pressure.
In the described step (d), concrete steps are: the rock core of shutoff takes out, oppositely is contained in the stifled rear water phase permeability of measuring in the core holding unit; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; Writing time and flow allow water flow through at least 15min of rock core, or wait for enter the about 1ml of measuring tube by rock core till, measure pressure reduction between flow and sample two ends, thus measure stifled after the water phase permeability K of rock core
/ w, obtain sealing ratiod; Repeat under certain conditions this experiment behind the maintenance certain hour and obtain the sealing ratiod of the rock core after the maintenance.
In the described step (e), concrete steps are: the rock core of shutoff behind the molten or hydrogen peroxide dipping, is surveyed its permeability K by acid
l(μ m
2), be permeability resume figure with the ratio that blocks up front water phase permeability.
In sum, the invention has the beneficial effects as follows: can test out fast with the plugging effect that bores leak-proof sealing agent, and measuring accuracy is high, testing procedure is simple, greatly reduces testing cost.
Embodiment
Below in conjunction with embodiment, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited to this.
Embodiment:
The present invention relates to a kind of method of testing with boring leak-proof leak-stopping system plugging effect, may further comprise the steps:
(a) application standard saline sook rock core is to keep to greatest extent the original character of rock core;
(b) measure stifled front permeability;
(c) shutoff;
(d) measure stifled rear permeability;
(e) permeability resume figure test.
In the described step (a), by mass, normal saline solution forms: 2.0%KCl+5.5%NaCl+0.45%MgCl
2+ 0.55%CaCl
2
In the described step (a), with the normal saline solution vacuum outgas 1h for preparing.
In the described step (b), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; The pressure differential at rock core two ends and the flow ml/s of current when the mensuration brine stream is crossed rock core ask its stifled front water phase permeability K
w
In the described step (c), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump is forced into preset pressure; Open constant-flux pump and be forced into preset pressure; Inject displacing fluid at constant pump speed and constant driving under the body pressure, also wait for shutoff writing time, after blocking for the first time more gradually gradient increase displacement pressure, in the hope of the maximum surge pressure of this shutoff experiment, namely forward bears pressure; Release, the rock core taking-up with shutoff oppositely is contained in the core holding unit, and gradient increases displacement pressure gradually again, tries to achieve the maximum aspiration pressure of this shutoff experiment, namely oppositely bears pressure.
In the described step (d), concrete steps are: the rock core of shutoff takes out, oppositely is contained in the stifled rear water phase permeability of measuring in the core holding unit; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; Writing time and flow allow water flow through at least 15min of rock core, or wait for enter the about 1ml of measuring tube by rock core till, measure pressure reduction between flow and sample two ends, thus measure stifled after the water phase permeability K of rock core
/ w, obtain sealing ratiod; Repeat under certain conditions this experiment behind the maintenance certain hour and obtain the sealing ratiod of the rock core after the maintenance.
In the described step (e), concrete steps are: the rock core of shutoff behind the molten or hydrogen peroxide dipping, is surveyed its permeability K by acid
l(μ m
2), be permeability resume figure with the ratio that blocks up front water phase permeability.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and any simple modification, the equivalent variations on every foundation technical spirit of the present invention above embodiment done all fall within protection scope of the present invention.
Claims (7)
1. the method for testing with brill leak-proof leak-stopping system plugging effect is characterized in that, may further comprise the steps:
(a) application standard saline sook rock core is to keep to greatest extent the original character of rock core;
(b) measure stifled front permeability;
(c) shutoff;
(d) measure stifled rear permeability;
(e) permeability resume figure test.
2. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1 is characterized in that, in the described step (a), by mass, normal saline solution forms: 2.0%KCl+5.5%NaCl+0.45%MgCl
2+ 0.55%CaCl
2
3. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1 is characterized in that, in the described step (a), with the normal saline solution vacuum outgas 1h for preparing.
4. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1, it is characterized in that in the described step (b), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; The pressure differential at rock core two ends and the flow ml/s of current when the mensuration brine stream is crossed rock core ask its stifled front water phase permeability K
w
5. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1, it is characterized in that in the described step (c), concrete steps are: rock core is contained in the core holding unit, and being heated to needs temperature; Pitcher pump is forced into preset pressure; Open constant-flux pump and be forced into preset pressure; Inject displacing fluid at constant pump speed and constant driving under the body pressure, also wait for shutoff writing time, after blocking for the first time more gradually gradient increase displacement pressure, in the hope of the maximum surge pressure of this shutoff experiment, namely forward bears pressure; Release, the rock core taking-up with shutoff oppositely is contained in the core holding unit, and gradient increases displacement pressure gradually again, tries to achieve the maximum aspiration pressure of this shutoff experiment, namely oppositely bears pressure.
6. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1, it is characterized in that, in the described step (d), concrete steps are: the rock core of shutoff takes out, oppositely is contained in the stifled rear water phase permeability of measuring in the core holding unit; Pitcher pump adds confined pressure to preset pressure; Open constant-flux pump and be forced into preset pressure; Under constant pump speed, inject normal saline solution to rock core; Writing time and flow allow water flow through at least 15min of rock core, or wait for enter the about 1ml of measuring tube by rock core till, measure pressure reduction between flow and sample two ends, thus measure stifled after the water phase permeability K of rock core
/ w, obtain sealing ratiod; Repeat under certain conditions this experiment behind the maintenance certain hour and obtain the sealing ratiod of the rock core after the maintenance.
7. a kind of method of testing with boring leak-proof leak-stopping system plugging effect according to claim 1 is characterized in that in the described step (e), concrete steps are: rock core that will shutoff by sour molten or hydrogen peroxide dipping after, survey its permeability K
l(μ m
2), be permeability resume figure with the ratio that blocks up front water phase permeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110290285 CN102998238A (en) | 2011-09-14 | 2011-09-14 | Method for testing plugging effect of leakage-proof plugging system while drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110290285 CN102998238A (en) | 2011-09-14 | 2011-09-14 | Method for testing plugging effect of leakage-proof plugging system while drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102998238A true CN102998238A (en) | 2013-03-27 |
Family
ID=47927089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110290285 Pending CN102998238A (en) | 2011-09-14 | 2011-09-14 | Method for testing plugging effect of leakage-proof plugging system while drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102998238A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606775A (en) * | 2016-02-29 | 2016-05-25 | 中国石油天然气股份有限公司 | Novel crack simulation and evaluation experiment method |
| CN108071361A (en) * | 2017-12-29 | 2018-05-25 | 长江大学 | A kind of device and its plugging effect evaluation method being used for the closure of shale microcrack |
| CN108627446A (en) * | 2018-06-11 | 2018-10-09 | 重庆科技学院 | A kind of shut-off capacity test method of pressure break sealing agent |
| CN109269901A (en) * | 2018-09-18 | 2019-01-25 | 中国石油大学(华东) | A kind of multiple dimensioned horizontal joint comprehensive regulation imitative experimental appliance of pressure-sensitive and method |
| CN109900232A (en) * | 2019-03-19 | 2019-06-18 | 西南石油大学 | The seam face drilling fluid anti-leaking method of fractured reservoir containing soluble salt |
| CN110671073A (en) * | 2019-10-23 | 2020-01-10 | 南智（重庆）能源技术有限公司 | Three-dimensional leakage stoppage method for natural gas well shaft leakage and test device thereof |
| CN111521537A (en) * | 2020-04-30 | 2020-08-11 | 太原理工大学 | Multidimensional data measuring device for coal block drilling process |
| CN113252532A (en) * | 2021-06-15 | 2021-08-13 | 西南石油大学 | Simulation device for breakthrough of abnormal high-temperature and high-pressure stratum sand body through seepage barrier |
| CN113640467A (en) * | 2021-08-09 | 2021-11-12 | 中国石油化工集团有限公司 | Method for evaluating plugging and plugging removal effects of plugging material |
-
2011
- 2011-09-14 CN CN 201110290285 patent/CN102998238A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606775A (en) * | 2016-02-29 | 2016-05-25 | 中国石油天然气股份有限公司 | Novel crack simulation and evaluation experiment method |
| CN108071361B (en) * | 2017-12-29 | 2020-02-07 | 长江大学 | Device for plugging shale microcracks and plugging effect evaluation method thereof |
| CN108071361A (en) * | 2017-12-29 | 2018-05-25 | 长江大学 | A kind of device and its plugging effect evaluation method being used for the closure of shale microcrack |
| CN108627446B (en) * | 2018-06-11 | 2020-10-09 | 重庆科技学院 | Method for testing plugging capability of plugging agent for fracturing |
| CN108627446A (en) * | 2018-06-11 | 2018-10-09 | 重庆科技学院 | A kind of shut-off capacity test method of pressure break sealing agent |
| CN109269901A (en) * | 2018-09-18 | 2019-01-25 | 中国石油大学(华东) | A kind of multiple dimensioned horizontal joint comprehensive regulation imitative experimental appliance of pressure-sensitive and method |
| CN109269901B (en) * | 2018-09-18 | 2021-01-12 | 中国石油大学(华东) | Pressure-sensitive multi-scale horizontal seam comprehensive regulation and control simulation experiment device and method |
| CN109900232A (en) * | 2019-03-19 | 2019-06-18 | 西南石油大学 | The seam face drilling fluid anti-leaking method of fractured reservoir containing soluble salt |
| CN109900232B (en) * | 2019-03-19 | 2020-05-01 | 西南石油大学 | Leakage-proof method for fracture surface soluble salt contained fractured formation drilling fluid |
| CN110671073A (en) * | 2019-10-23 | 2020-01-10 | 南智（重庆）能源技术有限公司 | Three-dimensional leakage stoppage method for natural gas well shaft leakage and test device thereof |
| CN111521537A (en) * | 2020-04-30 | 2020-08-11 | 太原理工大学 | Multidimensional data measuring device for coal block drilling process |
| CN111521537B (en) * | 2020-04-30 | 2022-10-21 | 太原理工大学 | Multidimensional data measuring device for coal block drilling process |
| CN113252532A (en) * | 2021-06-15 | 2021-08-13 | 西南石油大学 | Simulation device for breakthrough of abnormal high-temperature and high-pressure stratum sand body through seepage barrier |
| CN113252532B (en) * | 2021-06-15 | 2021-09-10 | 西南石油大学 | Simulation device for breakthrough of abnormal high-temperature and high-pressure stratum sand body through seepage barrier |
| CN113640467A (en) * | 2021-08-09 | 2021-11-12 | 中国石油化工集团有限公司 | Method for evaluating plugging and plugging removal effects of plugging material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102998238A (en) | Method for testing plugging effect of leakage-proof plugging system while drilling | |
| CN102070909B (en) | Cation modified asphalt and preparation method thereof | |
| CN102226076B (en) | Strongly-inhibitive collapse-prevention low-damage drilling fluid | |
| CN104497994A (en) | Drilling fluid and application of ionic liquid in drilling fluid | |
| CN105670584B (en) | A kind of temporary stifled type kill-job fluid being suitable for hypotonic low-pressure gas well well workover and preparation method | |
| CN102851008B (en) | Carbonate drilling fluid | |
| CN102993356A (en) | Preparation process of leak protection plugging agent along with drilling based on control of dosage of filling agent | |
| CN104987856B (en) | Offshore drilling fluid pressurization sealing agent and its application process | |
| Chuanwu et al. | Difficulties and countermeasures in horizontal well drilling for shale gas in Southern Sichuan | |
| CN110439525A (en) | Coal bed gas horizontal well de-plugging, anti-reflection completion method | |
| CN104712287A (en) | Extending method of horizontal well safe density window | |
| CN102993362A (en) | Preparation process of leak protection plugging agent along with drilling by controlling dosage of filling agent | |
| CN102093858A (en) | Leak plugging agent applied to exploration and development of petroleum and natural gas | |
| CN101387190B (en) | Well killing method using absorbent resin to protect low pressure oil and gas reservoir | |
| CN102998199A (en) | Method for testing imbibing capability of leakage-proof plugging agent while drilling | |
| CN111594124A (en) | Shallow tight oil reservoir imbibition fracturing method, fracturing system for shallow tight oil reservoir and discharge-free imbibition fracturing fluid | |
| CN102998206A (en) | Method for testing lubricity of leakage-proof plugging system while drilling | |
| CN109294544A (en) | Non-oxidized polymer chemistry de-plugging gel breaker and preparation method thereof | |
| CN102996113A (en) | Method for testing plugging capacity of polymer while-drilling leakproof plugging drilling system | |
| CN209976511U (en) | Circulation plugging device while drilling | |
| CN102993357A (en) | Preparation process of leak protection plugging agent along with drilling based on control of monomer concentration | |
| CN102998326A (en) | Method for testing temperature resistant performance of leakage-proof plugging system while drilling | |
| CN102993366A (en) | Preparation technique of preventing and plugging agent during drilling | |
| CN102996112A (en) | Method for testing plugging capacity of sulphonated polymer while-drilling leakproof plugging system | |
| CN102998205A (en) | Method for testing rock debris carrying capability of leakage-proof plugging system while drilling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130327 |