CN103509534A - Plugging agent for petroleum drilling - Google Patents

Plugging agent for petroleum drilling Download PDF

Info

Publication number
CN103509534A
CN103509534A CN201210225751.4A CN201210225751A CN103509534A CN 103509534 A CN103509534 A CN 103509534A CN 201210225751 A CN201210225751 A CN 201210225751A CN 103509534 A CN103509534 A CN 103509534A
Authority
CN
China
Prior art keywords
component
plugging agent
plugging
weight parts
agent
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.)
Granted
Application number
CN201210225751.4A
Other languages
Chinese (zh)
Other versions
CN103509534B (en
Inventor
刘四海
刘金华
张凤英
高书阳
陈曾伟
王治法
张国
徐江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
Original Assignee
China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Petroleum and Chemical Corp, Sinopec Research Institute of Petroleum Engineering filed Critical China Petroleum and Chemical Corp
Priority to CN201210225751.4A priority Critical patent/CN103509534B/en
Publication of CN103509534A publication Critical patent/CN103509534A/en
Application granted granted Critical
Publication of CN103509534B publication Critical patent/CN103509534B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/032—Inorganic additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/08—Fiber-containing well treatment fluids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts

Abstract

The invention provides a plugging agent for petroleum drilling. The plugging agent for petroleum drilling is composed of the following components: 60-80 parts of component A, namely, calcium carbonate and/or barium carbonate, 15-25 parts of component B, namely, lime powder and/or G-grade cement, and 5-15 parts of component C, namely, fibre materials, wherein preferably, the component A is particles with a particle size of 150-250 microns; the component B is powder with a particle size of greater than 0-150 microns; the length of the component C is 1-2 mm. The invention further provides preparation and application methods for the plugging agent. The plugging agent provided by the invention is simple in ingredients and preparation method, for example, the acid solubility can achieve more than 97.5%, thus facilitating acidification unplugging; the plugging agent can be independently used for plugging while drilling or matched with other bridging materials, and used in large and medium loss plugging work.

Description

Leak-stopping agent for petroleum drilling
Technical field
The present invention relates to petroleum drilling leak stopping field, relate in particular to a kind of leak-stopping agent for petroleum drilling and preparation method thereof.
Background technology
Leakage is one of common down-hole difficult problem of petroleum drilling, and leakage not only can expend rig time, loss drilling fluid, and likely cause the series of problems such as bit freezing, blowout, borehole well instability.For reservoir leakage, pile up at the venturi place that the subparticle in drilling fluid can be narrower at the gas channel of reservoir, thereby block or make flow passage to diminish part flow passage, therefore reduces oil gas flow.Under the anti-differential pressure action that these solid phase tampers usually produce in formation testing or oil recovery, can not be discharged from, thereby cause permanent plugging, have a strong impact on oil and gas production.
In order to protect reservoir, pressure that Di， shaft bottom produces will be near or below formation pore pressure to require drilling fluid density to try one's best, and prevents that drilling fluid filtrate and solid phase particle from entering reservoir.If reservoir pore space pressure is unknown, or a not only layer position of reservoir, each layer of interdigit pore pressure is inconsistent, and at this moment drilling fluid density causes leakage with regard to likely surpassing the pore pressure on stratum.If reservoir permeability is fine, easily cause permeability loss, the filtrate in common drilling fluid and solid phase particle are easy to enter reservoir, and reservoir is polluted.Run into this situation, just need in drilling fluid, add drill-feeding plugging agent, at reservoir, near the well section of the borehole wall, form fine and close plugged zone, the generation of prevention leakage, protects reservoir to avoid the injury of filtrate and solid phase particle as far as possible.
Patent CN1096537C discloses a kind of plugging agent, and its formula is: solubility in acid chemical substance material: wilkinite: lime powder: Paris white: cement: filamentary material=(15-45): (5-25): (5-30): (5-25): (0-40): (0-20).This plugging agent is used more for convenience, but component kind is more, and the solubility in acid of this plugging agent is unknown.
Patent CN1171969C discloses a kind of temporary plugging agent being comprised of swelling property material, bridging materials, packing material and inhibition material etc., wherein the size of swelling property material is 5-381 μ m, bridging materials is that size is the sheet mica of 11-541 μ m, packing material can be ordinary calcium carbonate etc., and size is 5-140 μ m.This temporary plugging agent has been used the strong basicity organic salts such as polyacrylonitrile sodium salt as inhibition material, and its hydrolysis or degraded product can produce toxicity.The use of such material also easily causes the pollution of Oil/gas Well, has also increased the complicacy that temporary plugging agent forms simultaneously.
In addition, conventional lost circulation additive material has 801 drill-feeding plugging agents, DF-1 uniaxial pressure encapsulant, and FDJ-1 plugging agent, KSY are without permeable membrane pressure-bearing treatment agent, PB-1 shielding diverting agent and calcium carbonate etc.These lost circulation additive materials have been obtained good plugging effect to a certain extent, but its solubility in acid is poor, and for example the molten rate of acid of general lost circulation additive material is below 30%.Although calcium carbonate has the high feature of sour molten rate, it can only use separately plugging effect poor as building bridge or packing material effect, only has with other patching materials and is used in conjunction with its plugging effect just better.
Summary of the invention
Generally lower for the molten rate of plugging agent acid of the prior art, easy contaminated oil gas-bearing formation when Reservoir Section is used, the problems such as the rear unfavorable acidifying solution depollution of Oil/gas Well operation, the present invention proposes a kind of leak-stopping agent for petroleum drilling and preparation method thereof.This patching materials can be used with boring, and also can be used in conjunction with other bridge material, is specially adapted to leakproof and the reservoir protection of Reservoir Section.
The invention still further relates to the application method according to plugging agent of the present invention.
According to the present invention, a kind of leak-stopping agent for petroleum drilling is provided, composed of the following components: component A: calcium carbonate and/or barium carbonate, 60 ~ 80 weight parts; B component: lime powder and/or G class g cement, 15 ~ 25 weight parts; Component C: filamentary material, 5 ~ 15 weight parts.
Wherein, component A can be regarded as and serves as bridging materials, and B component is served as increasing filter and packing material.Component C can be used for the peracid of construction cement slurry, textiles manufacture, filter tip, sheet base, plastics molten (for example sour molten rate is greater than 95%.In this article, sour molten rate refers to the mass percent that every 2 grams of samples can dissolve in the hydrochloric acid soln of 100ml 15%.) filamentary material.
In a preferred version of the present invention, plugging agent is composed of the following components: component A is 70 ~ 80 weight parts; B component is 15 ~ 20 weight parts; Component C is 10 ~ 15 weight parts.
In preferred version of the present invention, select bridging materials (component A), increasing filter and packing material (B component) and the filamentary material (component C) of peracid molten (for example sour molten rate is 97-100%), by bridging materials with increase filter and packing material is processed into respectively particle and the powdered material of different-grain diameter, filamentary material is processed into different length.By the size of further preferred particulates, powder and filamentary material and mutual proportion relation thereof, form the molten patching materials of the good peracid of performance.
Preferably, component A is that particle diameter is the particle of 150 ~ 250 μ m; B component is that particle diameter is the powder that is greater than 0 ~ 150 μ m; The length of component C is 1 ~ 2mm.
More preferably, component A is that particle diameter is the particle of 200 ~ 250 μ m, and B component is that particle diameter is the powder of 10 ~ 100 μ m.
According to preferred version of the present invention, component C is selected from one or more in alkali free glass fibre, trevira, two type cellulose acetate and triacetate fiber.Wherein, G class g cement for example can be good magnificent G class g cement.
Preferably, the molten rate of the acid of component A is 97-100%.
The present invention also provides a kind of preparation method of plugging agent, comprising: component A, B component and component C are put into stirrer by weight part as above, and churning time is made as 1 ~ 7min, takes out, and obtains described plugging agent.Preferably, churning time is made as to 2 ~ 5min.
In addition, the present invention also provides the application method according to plugging agent of the present invention, comprising: (i) plugging agent is added in drilling fluid, make the plugging agent that contains 2 ~ 5g in the drilling fluid of every 100ml, gained mixture is for lost circulation additive; Or (ii) plugging agent and bridge material are added in drilling fluid and form leak stopping slurry, for plugging operations, the plugging agent that wherein contains 2 ~ 5g in every 100ml leak stopping slurry.Bridge material described in (ii) refers to the larger particulate material of particle diameter adapting with leakage channel width, is generally the granulate material that is greater than 0.5mm, and it can contact with each other formation " bridge-like structure " in leakage channel.Like this, fill by the less particulate state of particle diameter or flaky material in the rear formed space of particulate material bridge formation that particle diameter is larger, thereby can reach the object of shutoff drop ply.Described bridging materials is such as being shell, rubber grain, broken plastic pellet of various particle diameters etc.
According to plugging agent of the present invention, it forms simple, does not need complexity or expensive material, need to do not formed by the material of crossing multiple types yet, and its preparation is simple.
The molten rate of the acid of plugging agent of the present invention in 15% hydrochloric acid can reach more than 97.5%.Therefore, this plugging agent is easy to acidification to dispel block in the application of drilling well, and can not damage reservoir.
Plugging agent according to the present invention dispersibles in drilling fluid, very little on the impact of drilling fluid rheology performance, can assist and generate fine and close mud cake, improves plugging effect.This plugging agent both can also can coordinate with other bridge material separately for lost circulation additive, for big-and-middle-sized leakage plugging operations.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, but scope of the present invention is not limited to this.
Embodiment 1-4:
First, each component A and B component shown in table 1 are processed to (for example grinding), particulate component A and the finely powdered B component below 150 μ m of then with standard sieve, screening 150 ~ 250 μ m.Component C is cut into the long short silk of 1 ~ 2mm standby.
Each component is put into the omnipotent stirrer of high speed according to the formula of the embodiment 1-4 shown in table 1 and stir certain hour, take out, can obtain the plugging agent of embodiment 1-4.
Measure plugging agent that each embodiment the obtains molten rate of acid in 15% hydrochloric acid, result is as shown in table 1.
Comparative example:
The plugging agent that comparative example is used is commercially available shielding diverting agent PB-1, measures the molten rate of its acid in 15% hydrochloric acid, and result is as shown in table 1.
Table 1
Figure BDA00001832826400041
Visible, plugging agent prepared in accordance with the present invention has higher solubility in acid, and for example the molten rate of the acid of the plugging agent of embodiment 1-4 in 15% hydrochloric acid is all greater than 97.5%, is easy to acidification to dispel block, and can not damage reservoir.

Claims (9)

1. a leak-stopping agent for petroleum drilling, composed of the following components:
Component A: calcium carbonate and/or barium carbonate, 60 ~ 80 weight parts;
B component: lime powder and/or G class g cement, 15 ~ 25 weight parts; With
Component C: filamentary material, 5 ~ 15 weight parts.
2. plugging agent according to claim 1, is characterized in that, described component A is 70 ~ 80 weight parts; Described B component is 15 ~ 20 weight parts; Described component C is 10 ~ 15 weight parts.
3. plugging agent according to claim 1, is characterized in that, described component A is that particle diameter is the particle of 150 ~ 250 μ m; Described B component is that particle diameter is the powder that is greater than 0 ~ 150 μ m; The length of described component C is 1 ~ 2mm.
4. plugging agent according to claim 1, is characterized in that, described component A is that particle diameter is the particle of 200 ~ 250 μ m, and described B component is that particle diameter is the powder of 10 ~ 100 μ m.
5. according to the plugging agent described in any one in claim 1-4, it is characterized in that, described component C is selected from one or more in alkali free glass fibre, trevira, two type cellulose acetate and triacetate fiber.
6. according to the plugging agent described in any one in claim 1-4, it is characterized in that, the molten rate of acid of component A is 97-100%.
7. a method of preparing the plugging agent as described in any one in claim 1-6, comprise: component A, B component and component C are put into stirrer by weight part as claimed in claim 1 or 2, churning time is made as 1 ~ 7min, takes out, and obtains described plugging agent.
8. method according to claim 7, is characterized in that, described churning time is made as 2 ~ 5min.
9. an application method for the plugging agent preparing according to the method described in claim 7 or 8, comprising:
(i) plugging agent is added in drilling fluid, make the plugging agent that contains 2 ~ 5g in the drilling fluid of every 100ml, gained mixture is for lost circulation additive; Or
(ii) plugging agent and bridge material are added in drilling fluid and form leak stopping slurry, for plugging operations, the plugging agent that wherein contains 2 ~ 5g in every 100ml leak stopping slurry.
CN201210225751.4A 2012-06-29 2012-06-29 Leak-stopping agent for petroleum drilling Active CN103509534B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210225751.4A CN103509534B (en) 2012-06-29 2012-06-29 Leak-stopping agent for petroleum drilling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210225751.4A CN103509534B (en) 2012-06-29 2012-06-29 Leak-stopping agent for petroleum drilling

Publications (2)

Publication Number Publication Date
CN103509534A true CN103509534A (en) 2014-01-15
CN103509534B CN103509534B (en) 2016-03-30

Family

ID=49892973

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210225751.4A Active CN103509534B (en) 2012-06-29 2012-06-29 Leak-stopping agent for petroleum drilling

Country Status (1)

Country Link
CN (1) CN103509534B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104087274A (en) * 2014-07-14 2014-10-08 中国石油集团渤海钻探工程有限公司 Multi-stage blocking pressure-bearing plugging agent
CN104892836A (en) * 2015-05-15 2015-09-09 西安理工大学 Nano-plugging agent for oil well water plugging and preparation method thereof
CN105623632A (en) * 2016-03-10 2016-06-01 中国石油天然气集团公司 Acid soluble curing plugging agent
CN105647494A (en) * 2014-09-18 2016-06-08 新疆格瑞迪斯石油技术股份有限公司 Agent for leak prevention and leak stoppage while drilling and preparation process thereof
CN107011875A (en) * 2017-04-12 2017-08-04 中国石油化工股份有限公司 A kind of drilling fluid crack sealing agent and preparation method thereof
CN108865088A (en) * 2018-07-04 2018-11-23 西南石油大学 Diverting agent and preparation method thereof and with drilling fluid and its application in fracture-type reservoir plugging while drilling
CN109135695A (en) * 2018-09-07 2019-01-04 中国石油化工股份有限公司 A kind of molten plugging drilling fluid of theobromine and preparation method thereof
CN110105934A (en) * 2019-04-19 2019-08-09 河南省遨太化工有限公司 A kind of drilling fluid acid-soluble pressurization sealing agent and preparation method
CN110819321A (en) * 2018-08-13 2020-02-21 中国石油化工股份有限公司 Curing plugging agent, preparation method thereof and plugging slurry
CN112195017A (en) * 2020-10-10 2021-01-08 蒙吉光 Plugging agent, preparation method and application thereof in well drilling plugging
CN113390726A (en) * 2021-06-10 2021-09-14 中国石油天然气股份有限公司 Packer leakage plugging material, experimental method and device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1280239A (en) * 1999-07-12 2001-01-17 四川石油管理局川东钻探公司 Strong binding acid soluble leak stopping agent
CN1432620A (en) * 2002-01-14 2003-07-30 中国石油化工股份有限公司 Temporary leakage-stopping agent for well drilling shielding and its application
US20100273912A1 (en) * 2007-05-10 2010-10-28 Halliburton Energy Services, Inc. Cement Compositions Comprising Latex and a Nano-Particle
US20110162845A1 (en) * 2007-05-10 2011-07-07 Halliburton Energy Services, Inc. Lost Circulation Compositions and Associated Methods
CN102453472A (en) * 2010-10-25 2012-05-16 中国石油化工股份有限公司 High strength heat resistant bridging plugging agent and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1280239A (en) * 1999-07-12 2001-01-17 四川石油管理局川东钻探公司 Strong binding acid soluble leak stopping agent
CN1432620A (en) * 2002-01-14 2003-07-30 中国石油化工股份有限公司 Temporary leakage-stopping agent for well drilling shielding and its application
US20100273912A1 (en) * 2007-05-10 2010-10-28 Halliburton Energy Services, Inc. Cement Compositions Comprising Latex and a Nano-Particle
US20110162845A1 (en) * 2007-05-10 2011-07-07 Halliburton Energy Services, Inc. Lost Circulation Compositions and Associated Methods
CN102453472A (en) * 2010-10-25 2012-05-16 中国石油化工股份有限公司 High strength heat resistant bridging plugging agent and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王建学等: "《钻井工程》", 30 April 2008, 石油工业出版社 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104087274A (en) * 2014-07-14 2014-10-08 中国石油集团渤海钻探工程有限公司 Multi-stage blocking pressure-bearing plugging agent
CN104087274B (en) * 2014-07-14 2016-10-19 中国石油集团渤海钻探工程有限公司 Multistage closure pressurization sealing agent
CN105647494A (en) * 2014-09-18 2016-06-08 新疆格瑞迪斯石油技术股份有限公司 Agent for leak prevention and leak stoppage while drilling and preparation process thereof
CN104892836A (en) * 2015-05-15 2015-09-09 西安理工大学 Nano-plugging agent for oil well water plugging and preparation method thereof
CN105623632A (en) * 2016-03-10 2016-06-01 中国石油天然气集团公司 Acid soluble curing plugging agent
CN107011875A (en) * 2017-04-12 2017-08-04 中国石油化工股份有限公司 A kind of drilling fluid crack sealing agent and preparation method thereof
CN108865088A (en) * 2018-07-04 2018-11-23 西南石油大学 Diverting agent and preparation method thereof and with drilling fluid and its application in fracture-type reservoir plugging while drilling
CN110819321A (en) * 2018-08-13 2020-02-21 中国石油化工股份有限公司 Curing plugging agent, preparation method thereof and plugging slurry
CN110819321B (en) * 2018-08-13 2021-12-28 中国石油化工股份有限公司 Curing plugging agent, preparation method thereof and plugging slurry
CN109135695A (en) * 2018-09-07 2019-01-04 中国石油化工股份有限公司 A kind of molten plugging drilling fluid of theobromine and preparation method thereof
CN110105934A (en) * 2019-04-19 2019-08-09 河南省遨太化工有限公司 A kind of drilling fluid acid-soluble pressurization sealing agent and preparation method
CN112195017A (en) * 2020-10-10 2021-01-08 蒙吉光 Plugging agent, preparation method and application thereof in well drilling plugging
CN113390726A (en) * 2021-06-10 2021-09-14 中国石油天然气股份有限公司 Packer leakage plugging material, experimental method and device

Also Published As

Publication number Publication date
CN103509534B (en) 2016-03-30

Similar Documents

Publication Publication Date Title
CN103509534A (en) Plugging agent for petroleum drilling
EP1991633B1 (en) Wellbore fluid comprising a base fluid and a particulate bridging agent
CN103740341B (en) The agent of leak stopping pressure-bearing
CN106281272B (en) A kind of fracture-type reservoir bridge joint sealing agent and the preparation method and application thereof
CN102559155B (en) Strong-inhibition efficient shielding temporary plugging protection reservoir drilling fluid and preparation method thereof
CN103013467B (en) Nonclay one-way plugging drilling fluid
CN102618234B (en) High sour gas well gas testing operation operation temporary plugging agent
CN103450867B (en) A kind of method solving water-blocking effect
US9637675B2 (en) Use of composites having deformable core and viscosifying agent coated thereon in well treatment operations
Luzardo et al. Alternative lost circulation material for depleted reservoirs
CN104119847A (en) Acid-soluble composite plugging agent and application thereof
CN103602323A (en) Nanometer plugging agent for drilling fluid and preparation method thereof
CN103740346A (en) Plugging flexibilizer
CN103773335B (en) Acidificable consolidation type plugging agent
CN104634924A (en) Temporary plugging agent reservoir protection effect evaluating method
Yang et al. A biomimetic drilling fluid for wellbore strengthening
US11525079B1 (en) Preparation method of fully adaptive modified nanographene plugging type anti-collapse drilling fluid and use thereof
CN103131402A (en) High temperature resistance solid free low damage well killing fluid and preparation method thereof
CN110139909A (en) Form the leakage control slurry of the fast dewatering of acid-soluble plug
CN110819314A (en) Novel drilling fluid nano plugging agent, preparation method thereof and water-based drilling fluid containing plugging agent
CN107057662A (en) A kind of water-base drilling fluid sealing agent and its preparation method and application
US20220041916A1 (en) Cross-linked plugging agent stimulated by high density brine and preparing method thereof
CN101092559A (en) Water flooding added agent in use for watering oil field, and preparation method
CN102504781B (en) Oil and water well sealing and plugging agent and preparation method thereof
CN102516957A (en) Degradable drilling fluid used for drilling in soft coal seam

Legal Events

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