CN107573912A - Mud cake elasticity agent, its preparation method and application and mud cake molding simulation method - Google Patents
Mud cake elasticity agent, its preparation method and application and mud cake molding simulation method Download PDFInfo
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- CN107573912A CN107573912A CN201710993581.7A CN201710993581A CN107573912A CN 107573912 A CN107573912 A CN 107573912A CN 201710993581 A CN201710993581 A CN 201710993581A CN 107573912 A CN107573912 A CN 107573912A
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Abstract
The invention discloses a kind of mud cake elasticity agent, its preparation method and application and mud cake molding simulation method.The mass percent of the mud cake elasticity agent each component is：Acrylamide 12.5%~20%, acrylic acid 5%~7.5%, N, N DMAAs 5%~7.5%, N, N methylene-bisacrylamides 0.05%~0.15%, ammonium persulfate 0.02%~0.15%, the potassium ferricyanide 0.025%~0.175%, remaining is water.Mud cake elasticity agent provided by the invention can be such that the mud cake of well cementation annular space second interface is integrally crosslinked, form one layer of elastification mud cake for being similar to rubber resin, with good sealability and higher intensity, be advantageous to improve the airtight quality of well cementation second interface, overcome present in existing mud cake curing, solidify the problem that damage inactivation easily occurs for mud cake in the production in later stage and stimulation process.
Description
Technical field
The present invention relates to a kind of mud cake elasticity agent, and in particular to a kind of mud cake elasticity agent, its preparation method and application
And mud cake molding simulation method.Belong to the solid completion technique field of petroleum works.
Background technology
Well cementation is an important step during oil, gas well shaft building, is the tripping in sleeve pipe into well after well is drilled to,
And the process of cement mortar is injected to the annular space between well and sleeve pipe.One of main function of cementing concrete ring is excluder ring
It is empty.The failure of cement sheath annular space sealability can cause crossflow, influence the separate zone production and management of oil-gas Layer, or even can cause
Well head bleed steams, and endangers environment and personal safety.After terminating due to well cementing operation, one layer is often had at well cementation second interface
The mud cake that can not be consolidated is present, postponement over time, and this layer of uncured mud cake can be gradually due to reasons such as the water-soluble erosions in stratum
Destroy, cause fluid that channelling occurs at annular space second interface.In order to improve the sealability of second interface mud cake, researcher
Mud cake curing is proposed, is solidified the mud cake that can not solidify originally to improve two boundaries of well cementation by using some measures
The sealability of face mud cake.Mud cake curing mainly includes two kinds, and (Mud to Cement, i.e. mud are converted into cement to MTC
Slurry) multifunctional drilling fluid method is combined, with MTA (Mud Cake to Agglomerated Cake, i.e. mud cake are imitatively into solidifying cake)
Method.Although the sealing effectiveness of the solidification mud cake formed by above-mentioned mud cake curing preferably changes than having before solidification
It is kind, but the intensity of the solidification mud cake formed in aforementioned manners is weaker, in the production in later stage and stimulation process, solidification mud cake holds
Failure damage, and then loss of seal ability easily occurs.
The content of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of mud cake elasticity agent, its preparation side
Method and application and mud cake molding simulation method.After the mud cake elasticity agent enters mud cake as Cementing leak-off, make mud
Cake is integrally cross-linked to form a kind of water-absorbing resin of high intensity, can improve the sealability of annular space second interface, and in the production in later stage
And in stimulation process, mud cake is not susceptible to failure damage.
To achieve the above object, the present invention uses following technical proposals：
A kind of mud cake elasticity agent, is made up of following raw materials by mass percentage：Acrylamide is 12.5%~20%, third
Olefin(e) acid is 5%~7.5%, and N,N-DMAA is 5%~7.5%, N, and N- methylene-bisacrylamides are 0.05%
~0.15%, ammonium persulfate is 0.02%~0.15%, and the potassium ferricyanide is 0.025%~0.175%, and remaining is water.
The preparation method of above-mentioned mud cake elasticity agent, it is concretely comprised the following steps：Take acrylamide, acrylic acid, N, N- dimethyl
Acrylamide, N, N- methylene-bisacrylamides, ammonium persulfate, the potassium ferricyanide are dissolved in water and are mixed to prepare mud cake elasticity agent.
Application of the above-mentioned mud cake elasticity agent in well cementation as Cementing, using above-mentioned mud cake elasticity agent as solid
After well prepad fluid leak-off enters mud cake, mud cake is integrally cross-linked to form a kind of water-absorbing resin of high intensity, the boundary of annular space two can be improved
The sealability in face, and in the production in later stage and stimulation process, mud cake is not susceptible to failure damage.
As one of preferable technical scheme, above-mentioned application concretely comprises the following steps：
(1) above-mentioned mud cake elasticity agent is injected into Oil/gas Well as Cementing, the mud cake elasticity agent with
Wall cake directly contacts；
(2) cement mortar is injected into Oil/gas Well, the cement mortar directly contacts with mud cake elasticity agent in step (1).
As one of preferable technical scheme, step (1) the mud cake elasticity agent is more than 8 with wall cake time of contact
Minute.
As one of further preferred technical scheme, when step (1) the mud cake elasticity agent contacts with wall cake
Between be more than 10 minutes.
A kind of mud cake molding simulation method, this analogy method are to simulate elastification indoors using above-mentioned mud cake elasticity agent
The forming process of mud cake, it is concretely comprised the following steps：
(1) drilling well liquid-based slurry is poured into cement mortar high-temperature and high-pressure filter press cylinder, is pressurizeed using nitrogen, in 30 DEG C, 1MPa
Keep preparing drilling fluid mud cake in 30 minutes under pressure difference；
(2) pressure is laid down, filter press cylinder is opened and carefully washes unnecessary drilling well liquid-based slurry, by above-mentioned mud cake elastification
Agent is poured into filter press cylinder as Cementing, is pressurizeed 10 minutes under 1MPa pressure difference, is penetrated into mud cake elasticity agent and is bored
In well liquid mud cake；
(3) the drilling fluid mud cake for being permeated with mud cake elasticity agent is taken out, the water-bath maintenance 8 at a temperature of normal pressure, 70 DEG C
Hour, obtain elastification mud cake.
As one of preferable technical scheme, the compound method of above-mentioned steps (1) the drilling well liquid-based slurry is：By 4 weight
The clear water mixing of part sodium bentonite, the sodium carbonate of 0.2 parts by weight, 100 parts by weight, high-speed stirred 24 hours.
After mud cake elasticity agent provided by the invention enters mud cake as Cementing leak-off, well cementation annular space two can be made
The mud cake at interface is integrally crosslinked, and forms one layer of elastification mud cake for being similar to rubber resin, has good sealability, higher
Intensity and shock resistance, be advantageous to improve well cementation second interface bonding quality.Utilize mud cake elasticity agent provided by the invention
The elastification mud cake of formation in the production in later stage and stimulation process, is not easy compared with the solidification mud cake that mud cake solidification method is formed
Generation failure damage, overcome the problem that damage inactivation easily occurs for the solidification mud cake present in existing mud cake curing.
Brief description of the drawings
Fig. 1 is the state picture before elastification mud cake stretching prepared by simulating lab test；
State picture when Fig. 2 is elastification mud cake stretching prepared by simulating lab test；
Fig. 3 is the resistance impact of performance figure of the elastification mud cake of the embodiment of the present invention；
Fig. 4 is the resistance impact of performance figure for solidifying mud cake.
Embodiment
The present invention will be further elaborated with reference to the accompanying drawings and examples, it should which explanation, the description below is only
It is to explain the present invention, its content is not defined.
Embodiment 1：
Prepare mud cake elasticity agent：Take acrylamide, acrylic acid, N, N- DMAAs, N, N- di-2-ethylhexylphosphine oxides third
Acrylamide, ammonium persulfate, the potassium ferricyanide are dissolved in water composition mud cake elasticity agent.The quality hundred of each component in the mud cake elasticity agent
Fraction is respectively：Acrylamide is 20%, acrylic acid 5%, N,N-DMAA 5%, N, N- di-2-ethylhexylphosphine oxides third
Acrylamide is 0.15%, ammonium persulfate 0.15%, the potassium ferricyanide 0.175%, and remaining is water.
Using above-mentioned mud cake elasticity agent as Cementing, it is injected into Oil/gas Well, the mud cake elasticity agent and well
Wall mud cake directly contacts, and time of contact is 10 minutes, and cement mortar is injected into Oil/gas Well, makes cement mortar and mud cake elasticity agent
Directly contact.
In above-mentioned work progress, mud cake elasticity agent is penetrated into wall cake, can form elastification mud cake, the elasticity
Well cementation second interface airtight quality can be improved by changing mud cake, and in the production in later stage and stimulation process, be not susceptible to failure damage.
Mud cake molding simulation method：
Elastification mud cake preparation facilities is used as using cement mortar high-temperature and high-pressure filter press (model HTD7169), first to mistake
150g drilling well liquid-based slurry is poured into water instrument cylinder, is pressurizeed using nitrogen, keeps preparing brill in 30 minutes under 30 DEG C, 1MPa pressure differences
Well liquid mud cake, pressure is then laid down, open filter press cylinder and carefully wash unnecessary drilling fluid, by above-mentioned mud cake elasticity agent
100g pours into filter press cylinder as Cementing, continues to pressurize 10 minutes under 1MPa pressure difference, oozes mud cake elasticity agent
Enter drilling fluid mud cake, the drilling fluid mud cake for being permeated with mud cake elasticity agent is taken out, the water-bath maintenance at a temperature of normal pressure, 70 DEG C
8 hours, obtain elastification mud cake.The compound method of above-mentioned drilling well liquid-based slurry is：By 4 parts by weight sodium bentonites, 0.2 parts by weight
Sodium carbonate, 100 parts by weight clear water mixing, high-speed stirred 24 hours.
Embodiment 2：
Prepare elastic agent：Take acrylamide, acrylic acid, N, N- DMAAs, N, N- methylene bisacrylamide acyls
Amine, ammonium persulfate, the potassium ferricyanide are dissolved in water composition mud cake elasticity agent.The mass percent of each component in the mud cake elasticity agent
Respectively：Acrylamide is 12.5%, acrylic acid 7.5%, N,N-DMAA 7.5%, N, N- di-2-ethylhexylphosphine oxides
Acrylamide is 0.05%, ammonium persulfate 0.02%, the potassium ferricyanide 0.025%, and remaining is water.
Using above-mentioned mud cake elasticity agent as Cementing, it is injected into Oil/gas Well, the mud cake elasticity agent and well
Wall mud cake directly contacts, and time of contact is 10 minutes, and cement mortar is injected into Oil/gas Well, makes cement mortar and mud cake elasticity agent
Directly contact.
In above-mentioned work progress, mud cake elasticity agent is penetrated into wall cake, can form elastification mud cake, the elasticity
Well cementation second interface airtight quality can be improved by changing mud cake, and in the production in later stage and stimulation process, be not susceptible to failure damage.
Mud cake molding simulation method：
Elastification mud cake preparation facilities is used as using cement mortar high-temperature and high-pressure filter press (model HTD7169), first to mistake
150g drilling well liquid-based slurry is poured into water instrument cylinder, is pressurizeed using nitrogen, keeps preparing brill in 30 minutes under 30 DEG C, 1MPa pressure differences
Well liquid mud cake, pressure is then laid down, open filter press cylinder and carefully wash unnecessary drilling fluid, by above-mentioned mud cake elasticity agent
100g pours into filter press cylinder as Cementing, continues to pressurize 10 minutes under 1MPa pressure difference, oozes mud cake elasticity agent
Enter drilling fluid mud cake, the drilling fluid mud cake for being permeated with mud cake elasticity agent is taken out, the water-bath maintenance at a temperature of normal pressure, 70 DEG C
8 hours, obtain elastification mud cake.The compound method of above-mentioned drilling well liquid-based slurry is：By 4 parts by weight sodium bentonites, 0.2 parts by weight
Sodium carbonate, 100 parts by weight clear water mixing, high-speed stirred 24 hours.
Embodiment 3：
Prepare elastic agent：Take acrylamide, acrylic acid, N, N- DMAAs, N, N- methylene bisacrylamide acyls
Amine, ammonium persulfate, the potassium ferricyanide are dissolved in water composition mud cake elasticity agent.The mass percent of each component in the mud cake elasticity agent
Respectively：Acrylamide is 15%, acrylic acid 10%, N,N-DMAA 10%, N, N- methylene bisacrylamides
Acid amides is 1%, ammonium persulfate 1%, the potassium ferricyanide 0.1%, and remaining is water.
Using above-mentioned mud cake elasticity agent as Cementing, it is injected into Oil/gas Well, the mud cake elasticity agent and well
Wall mud cake directly contacts, and time of contact is 10 minutes, and cement mortar is injected into Oil/gas Well, makes cement mortar and mud cake elasticity agent
Directly contact.
In above-mentioned work progress, mud cake elasticity agent is penetrated into wall cake, can form elastification mud cake, the elasticity
Well cementation second interface airtight quality can be improved by changing mud cake, and in the production in later stage and stimulation process, be not susceptible to failure damage.
Mud cake molding simulation method：
Elastification mud cake preparation facilities is used as using cement mortar high-temperature and high-pressure filter press (model HTD7169), first to mistake
150g drilling well liquid-based slurry is poured into water instrument cylinder, is pressurizeed using nitrogen, keeps preparing brill in 30 minutes under 30 DEG C, 1MPa pressure differences
Well liquid mud cake, pressure is then laid down, open filter press cylinder and carefully wash unnecessary drilling fluid, by above-mentioned mud cake elasticity agent
100g pours into filter press cylinder as Cementing, continues to pressurize 10 minutes under 1MPa pressure difference, oozes mud cake elasticity agent
Enter drilling fluid mud cake, the drilling fluid mud cake for being permeated with mud cake elasticity agent is taken out, the water-bath maintenance at a temperature of normal pressure, 70 DEG C
8 hours, obtain elastification mud cake.The compound method of above-mentioned drilling well liquid-based slurry is：By 4 parts by weight sodium bentonites, 0.2 parts by weight
Sodium carbonate, 100 parts by weight clear water mixing, high-speed stirred 24 hours.
The form of elastification mud cake obtained by the present embodiment is as depicted in figs. 1 and 2, it can be seen that this elastification mud cake is specific
Higher elasticity, and be not easily broken.
Comparative example：
Prepare active drilling fluid of diving：Bentonite, metakaolin, slag, water are taken, forms active drilling fluid of diving.The latent activity
The mass percent of each component is respectively in drilling fluid：Bentonite is 3.4%, metakaolin 3.4%, slag 1.2%, its
Yu Weishui.
Prepare latent active drilling fluid solidification activator：Take sodium metasilicate, sodium hydroxide, water, the latent active drilling fluid solidification of composition
Activator.The mass percent of each component is respectively in the latent active drilling fluid solidification activator：Sodium metasilicate is 16%, hydroxide
Sodium is 0.4%, and remaining is water.
Mud cake molding simulation method：
Using cement mortar high-temperature and high-pressure filter press (model HTD7169) as solidification mud cake preparation facilities, first to dehydration
150g latent active drilling fluid is poured into instrument cylinder, is pressurizeed using nitrogen, keeps preparing for 30 minutes under 30 DEG C, 1MPa pressure differences latent
Active drilling fluid mud cake, pressure is then laid down, open filter press cylinder and carefully wash unnecessary drilling fluid, by above-mentioned latent activity
Drilling fluid solidification activator 100g pours into filter press cylinder as Cementing, continues to pressurize 10 minutes under 1MPa pressure difference,
Latent active drilling fluid solidification activator is penetrated into drilling fluid mud cake, the drilling fluid of latent active drilling fluid solidification activator will be permeated with
Mud cake takes out, and water-bath maintenance 24 hours at a temperature of normal pressure, 70 DEG C, obtains solidifying mud cake.Above-mentioned latent active drilling fluid is matched somebody with somebody
Method processed is：By 3.4 parts by weight sodium bentonites, the metakaolin of 3.4 parts by weight, the slags of 1.2 parts by weight, 92 parts by weight
Clear water mixes, high-speed stirred 24 hours.
Using under counterweight placement in height, the method for mud cake is impacted, evaluates the shock resistance of mud cake.Using 100g counterweight from
Eminence drop impact mud cake at 10cm.The shock resistance effect of the gained elastification mud cake of embodiment 3 is shown in Fig. 3, and mud cake is not sent out
Raw to destroy, the shock resistance of solidification mud cake obtained by comparative example takes effect fruit Fig. 4, and mud cake damage degree is high, it can be seen that the present invention is real
The elastification mud cake for applying example has preferably shock resistance compared to solidification mud cake.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, on the basis of technical scheme, those skilled in the art need not pay creative work and can do
The various modifications or deformation gone out are still within protection scope of the present invention.
Claims (8)
1. a kind of mud cake elasticity agent, it is characterised in that be made up of by mass percentage following raw materials：Acrylamide is 12.5%
~20%, acrylic acid is 5%~7.5%, and N,N-DMAA is 5%~7.5%, N, N- methylene-bisacrylamides
For 0.05%~0.15%, ammonium persulfate is 0.02%~0.15%, and the potassium ferricyanide is 0.025%~0.175%, and remaining is
Water.
2. the preparation method of the mud cake elasticity agent described in claim 1, it is characterised in that comprise the following steps：Take acryloyl
Amine, acrylic acid, N,N-DMAA, N, N- methylene-bisacrylamides, ammonium persulfate, the potassium ferricyanide are dissolved in water mixing
Mud cake elasticity agent is made.
3. application of the mud cake elasticity agent in well cementation as prepad fluid described in claim 1.
4. application of the mud cake elasticity agent according to claim 3 in well cementation as prepad fluid, it is characterised in that specific
Step is：
(1) above-mentioned mud cake elasticity agent is injected into Oil/gas Well as Cementing, the mud cake elasticity agent and the borehole wall
Mud cake directly contacts；
(2) cement mortar is injected into Oil/gas Well, the cement mortar directly contacts with mud cake elasticity agent in step (1).
5. application according to claim 4, step (1) the mud cake elasticity agent is more than 8 with wall cake time of contact
Minute.
6. application according to claim 5, step (1) the mud cake elasticity agent is more than 10 with wall cake time of contact
Minute.
A kind of 7. mud cake molding simulation method, it is characterised in that utilize the mould indoors of the mud cake elasticity agent described in claim 1
The forming process of pseudo-elastic approximation mud cake, it is concretely comprised the following steps：
(1) drilling well liquid-based slurry is poured into cement mortar high-temperature and high-pressure filter press cylinder, is pressurizeed using nitrogen, in 30 DEG C, 1MPa pressure differences
It is lower to keep preparing drilling fluid mud cake in 30 minutes；
(2) pressure is laid down, filter press cylinder is opened and carefully washes unnecessary drilling well liquid-based slurry, above-mentioned mud cake elasticity agent is made
Pour into filter press cylinder for Cementing, pressurizeed 10 minutes under 1MPa pressure difference, mud cake elasticity agent is penetrated into drilling fluid
In mud cake；
(3) the drilling fluid mud cake for being permeated with mud cake elasticity agent is taken out, water-bath maintenance 8 hours at a temperature of normal pressure, 70 DEG C,
Obtain elastification mud cake.
8. according to the method for claim 7, it is characterised in that the compound method of drilling well liquid-based slurry is：By 4 parts by weight
Sodium bentonite, the sodium carbonate of 0.2 parts by weight, 100 parts by weight clear water mixing, high-speed stirred 24 hours.
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Cited By (1)
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|---|---|---|---|---|
| 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 |
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