CN107573912B - Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method - Google Patents
Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method Download PDFInfo
- Publication number
- CN107573912B CN107573912B CN201710993581.7A CN201710993581A CN107573912B CN 107573912 B CN107573912 B CN 107573912B CN 201710993581 A CN201710993581 A CN 201710993581A CN 107573912 B CN107573912 B CN 107573912B
- Authority
- CN
- China
- Prior art keywords
- mud cake
- elasticizer
- mud
- cake
- percent
- 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.)
- Active
Links
Images
Landscapes
- Treatment Of Sludge (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a mud cake elasticizer, a preparation method and application thereof, and a mud cake forming simulation method. The mud cake elasticizer comprises the following components in percentage by mass: 12.5 to 20 percent of acrylamide, 5 to 7.5 percent of acrylic acid, 5 to 7.5 percent of N, N-dimethylacrylamide, 0.05 to 0.15 percent of N, N-methylene-bisacrylamide, 0.02 to 0.15 percent of ammonium persulfate, 0.025 to 0.175 percent of potassium ferricyanide and the balance of water. The mud cake elasticizer provided by the invention can enable the mud cakes on the two interfaces of the well cementation annulus to be integrally crosslinked to form a layer of elastic mud cake similar to rubber resin, has good sealing capability and higher strength, is beneficial to improving the sealing quality of the two interfaces of the well cementation, and overcomes the problem that the solidified mud cake is easy to damage and lose efficacy in the later production and yield increasing processes in the existing mud cake curing method.
Description
Technical Field
The invention relates to a mud cake elasticizer, in particular to a mud cake elasticizer, a preparation method and application thereof, and a mud cake forming simulation method. Belongs to the technical field of petroleum engineering well fixing and completing.
Background
Well cementation is an important link in the process of constructing oil and gas wells, and is a process of putting a casing into a well after a well bore is drilled, and injecting cement slurry into an annular space between the well bore and the casing. One of the main functions of the cementing cement sheath is to isolate the annulus. The annular sealing capability of the cement sheath fails to cause interlayer channeling, the layered exploitation and the management of an oil-gas layer are influenced, and even a wellhead is caused to emit oil and gas, so that the environment and the personal safety are damaged. After the well cementation operation is finished, a layer of mud cake which cannot be solidified often exists at the well cementation interface, and the layer of uncured mud cake is gradually damaged due to formation water corrosion and the like along with the delay of time, so that fluid channeling occurs at the annular space interface. In order to improve the sealing capability of the two-interface mud cake, researchers propose a mud cake curing method, and the sealing capability of the well cementation two-interface mud cake is improved by curing the mud cake which cannot be cured originally by adopting some measures. The Mud Cake curing method mainly comprises two methods, namely an MTC (Mud to Cement) method combined with a multifunctional drilling fluid method and an MTA (Mud Cake to aggregate Cake) method. Although the sealing effect of the solidified mud cake formed by the mud cake solidifying method is better improved than that before solidification, the strength of the solidified mud cake formed by the method is weaker, and the solidified mud cake is easy to lose effectiveness and damage and further lose the sealing capability in the later production and yield increasing processes.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a mud cake elasticizer, a preparation method and application thereof and a mud cake forming simulation method. The mud cake elasticizer is used as a cementing pad fluid to filter and enter the mud cake, so that the mud cake is integrally crosslinked to form a high-strength water-absorbing resin, the sealing capability of an annular two-interface can be improved, and the mud cake is not easy to lose efficacy and damage in the later production and yield increasing processes.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mud cake elasticizer is composed of the following raw materials by mass percent: 12.5 to 20 percent of acrylamide, 5 to 7.5 percent of acrylic acid, 5 to 7.5 percent of N, N-dimethylacrylamide, 0.05 to 0.15 percent of N, N-methylene-bisacrylamide, 0.02 to 0.15 percent of ammonium persulfate, 0.025 to 0.175 percent of potassium ferricyanide and the balance of water.
The preparation method of the mud cake elasticizer comprises the following specific steps: dissolving acrylamide, acrylic acid, N, N-dimethylacrylamide, N, N-methylene bisacrylamide, ammonium persulfate and potassium ferricyanide in water, and mixing to obtain the mud cake elasticizer.
The mud cake elasticizer is used as a cementing pad fluid in well cementation, and after the mud cake elasticizer is filtered into the mud cake as the cementing pad fluid, the whole mud cake is crosslinked to form a high-strength water-absorbing resin, so that the sealing capability of an annular two-interface can be improved, and the mud cake is not easy to lose efficacy and damage in the later production and yield increasing processes.
As one of the preferable technical solutions, the specific steps of the above application are:
(1) injecting the mud cake elasticizer serving as well cementation pad fluid into an oil gas well, wherein the mud cake elasticizer is directly contacted with a well wall mud cake;
(2) and (2) injecting cement slurry into the oil and gas well, wherein the cement slurry is in direct contact with the mud cake elasticizer in the step (1).
As one of the preferable technical proposal, the contact time of the mud cake elasticizer and the mud cake on the well wall in the step (1) is more than 8 minutes.
As one of the further preferable technical proposal, the contact time of the mud cake elasticizer and the mud cake on the well wall in the step (1) is more than 10 minutes.
A mud cake shaping simulation method is to simulate the shaping process of an elasticized mud cake indoors by using the mud cake elasticizer, and comprises the following specific steps:
(1) pouring drilling fluid base slurry into the cement slurry high-temperature high-pressure dehydration instrument cylinder, pressurizing by using nitrogen, and keeping for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a drilling fluid mud cake;
(2) pressure is relieved, a water loss instrument cylinder is opened, redundant drilling fluid base slurry is carefully cleaned, the mud cake elasticizer is poured into the water loss instrument cylinder as well cementation pad fluid, and the pressure is increased for 10 minutes under the pressure difference of 1MPa, so that the mud cake elasticizer is infiltrated into the drilling fluid mud cake;
(3) and taking out the mud cake of the drilling fluid into which the mud cake elasticizer is infiltrated, and carrying out water bath maintenance for 8 hours at the temperature of 70 ℃ under normal pressure to obtain the elasticized mud cake.
As one of the preferable technical solutions, the preparation method of the drilling fluid-based slurry in the step (1) comprises: 4 parts by weight of sodium bentonite, 0.2 part by weight of sodium carbonate and 100 parts by weight of clear water were mixed and stirred at high speed for 24 hours.
The mud cake elasticizer provided by the invention can be used as a cementing pad fluid to filter and enter the mud cake, so that the mud cake on the two interfaces of the cementing annulus can be integrally crosslinked to form a layer of elasticized mud cake similar to rubber resin, and the elasticized mud cake has good sealing capability, higher strength and impact resistance, and is beneficial to improving the cementing quality of the two interfaces of the cementing well. Compared with the solidified mud cake formed by the mud cake solidifying method, the elasticized mud cake formed by the mud cake elasticizer provided by the invention is not easy to fail and destroy in the later production and yield increasing processes, and overcomes the problem that the solidified mud cake is easy to destroy and lose efficacy in the existing mud cake solidifying method.
Drawings
FIG. 1 is a picture of the state of an elasticized mud cake prepared by an indoor simulation experiment before stretching;
FIG. 2 is a picture of the state of an elasticized mud cake prepared by an indoor simulation experiment when stretched;
FIG. 3 is a graph showing the effect of the impact resistance of the elasticized mud cake of this embodiment of the present invention;
fig. 4 is a graph of the impact resistance effect of the cured mud cake.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the invention.
Example 1:
preparing a mud cake elasticizer: dissolving acrylamide, acrylic acid, N-dimethylacrylamide, N-methylene-bisacrylamide, ammonium persulfate and potassium ferricyanide in water to form the mud cake elasticizer. The mud cake elasticizer comprises the following components in percentage by mass: 20% of acrylamide, 5% of acrylic acid, 5% of N, N-dimethylacrylamide, 0.15% of N, N-methylenebisacrylamide, 0.15% of ammonium persulfate, 0.175% of potassium ferricyanide and the balance of water.
And (3) injecting the mud cake elasticizer serving as well cementation pad fluid into an oil gas well, wherein the mud cake elasticizer is in direct contact with a mud cake on a well wall, the contact time is 10 minutes, and injecting cement slurry into the oil gas well to enable the cement slurry to be in direct contact with the mud cake elasticizer.
In the construction process, the mud cake elasticizer permeates into the mud cake of the well wall to form an elasticized mud cake, the elasticized mud cake can improve the sealing quality of the two interfaces of the well cementation, and the elasticized mud cake is not easy to lose effectiveness and damage in the production and yield increasing processes in the later period.
The mud cake forming simulation method comprises the following steps:
a cement slurry high-temperature high-pressure water loss instrument (model HTD7169) is used as an elasticizing mud cake preparation device, 150g of drilling fluid base slurry is poured into a water loss instrument cylinder, nitrogen is used for pressurization, the pressure is kept for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a drilling fluid mud cake, then the pressure is relieved, the water loss instrument cylinder is opened, redundant drilling fluid is carefully cleaned, 100g of mud cake elasticizer is poured into the water loss instrument cylinder as well cementation pad fluid, the pressurization is continued for 10 minutes under the pressure difference of 1MPa, the mud cake elasticizer is made to permeate the drilling fluid mud cake, the drilling fluid mud cake permeated with the mud cake elasticizer is taken out, and the water bath maintenance is carried out for 8 hours at the temperature of 70 ℃ under normal pressure to obtain the elasticizing mud cake. The preparation method of the drilling fluid base slurry comprises the following steps: 4 parts by weight of sodium bentonite, 0.2 part by weight of sodium carbonate and 100 parts by weight of clear water were mixed and stirred at high speed for 24 hours.
Example 2:
preparing an elasticizer: dissolving acrylamide, acrylic acid, N-dimethylacrylamide, N-methylene-bisacrylamide, ammonium persulfate and potassium ferricyanide in water to form the mud cake elasticizer. The mud cake elasticizer comprises the following components in percentage by mass: 12.5% of acrylamide, 7.5% of acrylic acid, 7.5% of N, N-dimethylacrylamide, 0.05% of N, N-methylenebisacrylamide, 0.02% of ammonium persulfate, 0.025% of potassium ferricyanide and the balance of water.
And (3) injecting the mud cake elasticizer serving as well cementation pad fluid into an oil gas well, wherein the mud cake elasticizer is in direct contact with a mud cake on a well wall, the contact time is 10 minutes, and injecting cement slurry into the oil gas well to enable the cement slurry to be in direct contact with the mud cake elasticizer.
In the construction process, the mud cake elasticizer permeates into the mud cake of the well wall to form an elasticized mud cake, the elasticized mud cake can improve the sealing quality of the two interfaces of the well cementation, and the elasticized mud cake is not easy to lose effectiveness and damage in the production and yield increasing processes in the later period.
The mud cake forming simulation method comprises the following steps:
a cement slurry high-temperature high-pressure water loss instrument (model HTD7169) is used as an elasticizing mud cake preparation device, 150g of drilling fluid base slurry is poured into a water loss instrument cylinder, nitrogen is used for pressurization, the pressure is kept for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a drilling fluid mud cake, then the pressure is relieved, the water loss instrument cylinder is opened, redundant drilling fluid is carefully cleaned, 100g of mud cake elasticizer is poured into the water loss instrument cylinder as well cementation pad fluid, the pressurization is continued for 10 minutes under the pressure difference of 1MPa, the mud cake elasticizer is made to permeate the drilling fluid mud cake, the drilling fluid mud cake permeated with the mud cake elasticizer is taken out, and the water bath maintenance is carried out for 8 hours at the temperature of 70 ℃ under normal pressure to obtain the elasticizing mud cake. The preparation method of the drilling fluid base slurry comprises the following steps: 4 parts by weight of sodium bentonite, 0.2 part by weight of sodium carbonate and 100 parts by weight of clear water were mixed and stirred at high speed for 24 hours.
Example 3:
preparing an elasticizer: dissolving acrylamide, acrylic acid, N-dimethylacrylamide, N-methylene-bisacrylamide, ammonium persulfate and potassium ferricyanide in water to form the mud cake elasticizer. The mud cake elasticizer comprises the following components in percentage by mass: 15% of acrylamide, 10% of acrylic acid, 10% of N, N-dimethylacrylamide, 1% of N, N-methylenebisacrylamide, 1% of ammonium persulfate, 0.1% of potassium ferricyanide and the balance of water.
And (3) injecting the mud cake elasticizer serving as well cementation pad fluid into an oil gas well, wherein the mud cake elasticizer is in direct contact with a mud cake on a well wall, the contact time is 10 minutes, and injecting cement slurry into the oil gas well to enable the cement slurry to be in direct contact with the mud cake elasticizer.
In the construction process, the mud cake elasticizer permeates into the mud cake of the well wall to form an elasticized mud cake, the elasticized mud cake can improve the sealing quality of the two interfaces of the well cementation, and the elasticized mud cake is not easy to lose effectiveness and damage in the production and yield increasing processes in the later period.
The mud cake forming simulation method comprises the following steps:
a cement slurry high-temperature high-pressure water loss instrument (model HTD7169) is used as an elasticizing mud cake preparation device, 150g of drilling fluid base slurry is poured into a water loss instrument cylinder, nitrogen is used for pressurization, the pressure is kept for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a drilling fluid mud cake, then the pressure is relieved, the water loss instrument cylinder is opened, redundant drilling fluid is carefully cleaned, 100g of mud cake elasticizer is poured into the water loss instrument cylinder as well cementation pad fluid, the pressurization is continued for 10 minutes under the pressure difference of 1MPa, the mud cake elasticizer is made to permeate the drilling fluid mud cake, the drilling fluid mud cake permeated with the mud cake elasticizer is taken out, and the water bath maintenance is carried out for 8 hours at the temperature of 70 ℃ under normal pressure to obtain the elasticizing mud cake. The preparation method of the drilling fluid base slurry comprises the following steps: 4 parts by weight of sodium bentonite, 0.2 part by weight of sodium carbonate and 100 parts by weight of clear water were mixed and stirred at high speed for 24 hours.
The shape of the elasticized mud cake obtained in this example is shown in fig. 1 and 2, and it can be seen that the elasticized mud cake has high elasticity and is not easily broken.
Comparative example:
preparing a latent-activity drilling fluid: the bentonite, metakaolin, slag and water are taken to form the latent-activity drilling fluid. The latent-activity drilling fluid comprises the following components in percentage by mass: 3.4 percent of bentonite, 3.4 percent of metakaolin, 1.2 percent of slag and the balance of water.
Preparing a latent-activity drilling fluid curing activator: sodium silicate, sodium hydroxide and water are taken to form the latent-activity drilling fluid curing activator. The curing activator for the latent-activity drilling fluid comprises the following components in percentage by mass: 16% of sodium silicate, 0.4% of sodium hydroxide and the balance of water.
The mud cake forming simulation method comprises the following steps:
a cement slurry high-temperature high-pressure water loss instrument (model HTD7169) is used as a solidified mud cake preparation device, 150g of latent-activity drilling fluid is poured into a water loss instrument cylinder, nitrogen is used for pressurization, the pressure is kept for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a latent-activity drilling fluid mud cake, then the pressure is relieved, the water loss instrument cylinder is opened, redundant drilling fluid is carefully cleaned, 100g of the latent-activity drilling fluid solidification activator is poured into the water loss instrument cylinder as well cementation pre-positioned fluid, pressurization is continued for 10 minutes under the pressure difference of 1MPa, the latent-activity drilling fluid solidification activator is made to permeate into the drilling fluid mud cake, the drilling fluid mud cake permeated with the latent-activity drilling fluid solidification activator is taken out, and water bath maintenance is carried out for 24 hours at the temperature of 70 ℃ under normal pressure to. The preparation method of the latent activity drilling fluid comprises the following steps: 3.4 parts by weight of sodium bentonite, 3.4 parts by weight of metakaolin, 1.2 parts by weight of slag and 92 parts by weight of clear water are mixed and stirred at a high speed for 24 hours.
And (3) evaluating the impact resistance of the mud cakes by adopting a method of dropping weights in high altitude and impacting the mud cakes. The cake was struck by dropping it from a height of 10cm with a 100g weight. The impact resistance effect of the elastic mud cake obtained in example 3 is shown in fig. 3, the mud cake is not damaged, the impact resistance effect of the cured mud cake obtained in the comparative example is shown in fig. 4, and the mud cake damage degree is high, so that the elastic mud cake of the example of the invention has better impact resistance than the cured mud cake.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto, and various modifications and variations which do not require inventive efforts and which are made by those skilled in the art are within the scope of the present invention.
Claims (7)
1. The mud cake elasticizer is characterized by comprising the following raw materials in percentage by mass: 12.5 to 20 percent of acrylamide, 5 to 7.5 percent of acrylic acid, 5 to 7.5 percent of N, N-dimethylacrylamide, 0.05 to 0.15 percent of N, N-methylene-bisacrylamide, 0.02 to 0.15 percent of ammonium persulfate, 0.025 to 0.175 percent of potassium ferricyanide and the balance of water;
the preparation method of the mud cake elasticizer comprises the following steps: dissolving acrylamide, acrylic acid, N, N-dimethylacrylamide, N, N-methylene bisacrylamide, ammonium persulfate and potassium ferricyanide in water, and mixing to obtain the mud cake elasticizer.
2. Use of a mud cake elasticizer according to claim 1 as a pad fluid in well cementing.
3. The application of the mud cake elasticizer as a pad fluid in well cementation according to claim 2 is characterized by comprising the following specific steps:
(1) injecting the mud cake elasticizer serving as well cementation pad fluid into an oil gas well, wherein the mud cake elasticizer is directly contacted with a well wall mud cake;
(2) and (2) injecting cement slurry into the oil and gas well, wherein the cement slurry is in direct contact with the mud cake elasticizer in the step (1).
4. The use of claim 3, wherein the mud-cake elasticizer of step (1) is in contact with the sidewall mud-cake for a period of time greater than 8 minutes.
5. The use of claim 4, wherein the mud-cake elasticizer of step (1) is in contact with the sidewall mud-cake for a period of time greater than 10 minutes.
6. A mud cake forming simulation method is characterized in that the mud cake elasticizer of claim 1 is used for simulating the forming process of an elasticated mud cake indoors, and the mud cake forming simulation method comprises the following specific steps:
(1) pouring drilling fluid base slurry into the cement slurry high-temperature high-pressure dehydration instrument cylinder, pressurizing by using nitrogen, and keeping for 30 minutes at 30 ℃ under the pressure difference of 1MPa to prepare a drilling fluid mud cake;
(2) pressure is relieved, a water loss instrument cylinder is opened, redundant drilling fluid base slurry is carefully cleaned, the mud cake elasticizer is poured into the water loss instrument cylinder as well cementation pad fluid, and the pressure is increased for 10 minutes under the pressure difference of 1MPa, so that the mud cake elasticizer is infiltrated into the drilling fluid mud cake;
(3) and taking out the mud cake of the drilling fluid into which the mud cake elasticizer is infiltrated, and carrying out water bath maintenance for 8 hours at the temperature of 70 ℃ under normal pressure to obtain the elasticized mud cake.
7. The method of claim 6, wherein the drilling fluid-based slurry is formulated by: 4 parts by weight of sodium bentonite, 0.2 part by weight of sodium carbonate and 100 parts by weight of clear water were mixed and stirred at high speed for 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993581.7A CN107573912B (en) | 2017-10-23 | 2017-10-23 | Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993581.7A CN107573912B (en) | 2017-10-23 | 2017-10-23 | Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107573912A CN107573912A (en) | 2018-01-12 |
| CN107573912B true CN107573912B (en) | 2020-03-31 |
Family
ID=61038467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710993581.7A Active CN107573912B (en) | 2017-10-23 | 2017-10-23 | Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107573912B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868656A (en) * | 2018-06-06 | 2018-11-23 | 中石化石油工程技术服务有限公司 | Bottom compression device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172890A (en) * | 1997-08-27 | 1998-02-11 | 辽河石油勘探局钻采工艺研究院 | Preparing and use of liquid bridging plug |
| CA2378952A1 (en) * | 1999-07-13 | 2001-01-18 | M-I L.L.C. | Latex additive for water-based drilling fluids |
| CN1752171A (en) * | 2004-09-22 | 2006-03-29 | 中国石油天然气股份有限公司 | Process for preparing high water absorption resin by underground polymerization |
| CN102863593A (en) * | 2012-09-18 | 2013-01-09 | 中国地质大学（武汉） | Sludge cake curing agent, and preparation and application method thereof |
| CN103289661A (en) * | 2012-03-01 | 2013-09-11 | 中国石油化工股份有限公司华东分公司采油厂 | High-temperature annular protection sealing liquid for water injection well |
| CN105062446A (en) * | 2015-08-27 | 2015-11-18 | 山东聚鑫化工有限公司 | Granular profile control water-plugging agent |
| CN106124400A (en) * | 2016-06-22 | 2016-11-16 | 西南石油大学 | A kind of high-density water-based drilling fluid mud cake quality evaluation methodology |
-
2017
- 2017-10-23 CN CN201710993581.7A patent/CN107573912B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172890A (en) * | 1997-08-27 | 1998-02-11 | 辽河石油勘探局钻采工艺研究院 | Preparing and use of liquid bridging plug |
| CA2378952A1 (en) * | 1999-07-13 | 2001-01-18 | M-I L.L.C. | Latex additive for water-based drilling fluids |
| CN1752171A (en) * | 2004-09-22 | 2006-03-29 | 中国石油天然气股份有限公司 | Process for preparing high water absorption resin by underground polymerization |
| CN103289661A (en) * | 2012-03-01 | 2013-09-11 | 中国石油化工股份有限公司华东分公司采油厂 | High-temperature annular protection sealing liquid for water injection well |
| CN102863593A (en) * | 2012-09-18 | 2013-01-09 | 中国地质大学（武汉） | Sludge cake curing agent, and preparation and application method thereof |
| CN105062446A (en) * | 2015-08-27 | 2015-11-18 | 山东聚鑫化工有限公司 | Granular profile control water-plugging agent |
| CN106124400A (en) * | 2016-06-22 | 2016-11-16 | 西南石油大学 | A kind of high-density water-based drilling fluid mud cake quality evaluation methodology |
Non-Patent Citations (2)
| Title |
|---|
| 基于地质聚合物原理实现泥饼固化的固井质量改善方法;步玉环 等;《钻井液与完井液》;20170131;第34卷(第1期);第96-100页 * |
| 泥饼质量改进剂及其对固井质量的影响;张健伟 等;《硅酸盐通报》;20160229;第35卷(第2期);第623-627页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107573912A (en) | 2018-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108756841B (en) | Shale repeated fracturing treatment method | |
| CN101857799B (en) | Curable leaking stoppage spacer fluid and preparation method thereof | |
| CN106639971B (en) | A kind of high pressure-bearing method for blocking of perforation holes | |
| CN100575447C (en) | A kind of composition and preparation thereof and application | |
| CN107573912B (en) | Mud cake elasticizer, preparation method and application thereof, and mud cake forming simulation method | |
| CN103740352A (en) | Expansion oil well cement with temperature resistance | |
| CN111472741A (en) | Experimental method for researching rock fracturing multi-crack propagation rule by using volume expansion material | |
| CN102926701A (en) | Continuous mixing type water plugging technique | |
| US7500520B2 (en) | Method of cementing well bores | |
| CN111285642A (en) | Plugging agent, preparation method and application thereof | |
| CN113266304B (en) | Penetrating hydrate layer cementing method for prolonging long-acting production life of oil and gas well | |
| CN103756656B (en) | For blocking the quiet gelling leakage-stop liquid of severe mud losses | |
| CN101967964B (en) | Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing | |
| CN111662048A (en) | Low-density plugging cement slurry system for cementing fractured oil reservoir | |
| CN106747130B (en) | A kind of high temperature resistant oil well sealing agent | |
| CN110954419B (en) | Hydraulic fatigue fracture design method for preset fracture | |
| CN109294542B (en) | Intra-fracture temporary plugging agent for fracturing and preparation method thereof | |
| CN112302604A (en) | Horizontal well subsection repeated fracturing method and application thereof | |
| RU2209928C1 (en) | Method of isolation of absorption zones in well | |
| CN109705828A (en) | A kind of high temperature resistant sealing agent and preparation method thereof | |
| CN105567188A (en) | Assistant for improving leak stopping performance of cyanogen coagulation leak stopping agent, preparation method thereof, and cyanogen coagulation leak stopping agent | |
| CN107559010B (en) | A kind of well-cementing cement | |
| RU2483093C1 (en) | Compound for isolation of water inflow and absorbing zones in well, and its application method | |
| CN110028941B (en) | Annular plugging agent and application thereof | |
| CN108130062B (en) | Rapid self-degradation water-soluble liquid rubber plug and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |