CN102504776A - Lost circulation material for malignant loss and preparation method - Google Patents
Lost circulation material for malignant loss and preparation method Download PDFInfo
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- CN102504776A CN102504776A CN2011103106112A CN201110310611A CN102504776A CN 102504776 A CN102504776 A CN 102504776A CN 2011103106112 A CN2011103106112 A CN 2011103106112A CN 201110310611 A CN201110310611 A CN 201110310611A CN 102504776 A CN102504776 A CN 102504776A
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Abstract
The invention relates to a lost circulation material for effectively plugging fractured and crushed stratum malignant loss in the drilling process and a preparation method. The invention adopts the technical scheme that a raw material for preparing the lost circulation material comprises the following components: 8 to 12 grams of hexadecyl dimethyl allyl ammonium chloride, 16 to 18 grams of acrylamide, 6 to 12 grams of styrene sodium sulfate, 0.2 to 0.4 gram of sodium dodecyl benzene sulfonate, 0.2 to 0.4 gram of potassium persulfate/sodium bisulfite, 16 to 20 grams of bentonite clay, and 239 to 279 grams of fresh water. The preparation method of the lost circulation material comprises the following steps of: firstly, dissolving recrystallized hexadecyl dimethyl allyl ammonium chloride, acrylamide and styrene sodium sulfate in the water; filling N2, adding an initiator and performing the reaction for 24 hours; precipitating, soaking and drying by using acetone so as to obtain white copolymer; and adding sodium dodecyl benzene sulfonate and bentonite clay into the copolymer and the water to obtain the lost circulation material. The lost circulation material can be used for plugging a leakage zone, has strong crushing resistance and strong temperature resistance and mineralization resistance degree and is suitable to be used for carrying out plugging on a big crack in the drilling process.
Description
Technical field
The present invention relates to a kind of being used in the drilling process effectively plugging agent and the compound method of shutoff crack property and the pernicious leakage of broken formation.
Background technology
In recent years, the western leakage problem with the Northeast, river oil gas deep drilling of China is very outstanding, and principal feature is deep-well, construct in front of the mountains, height is constructed suddenly, sulfide hydrogen, and leakage is general.Area, river east is over especially past 10 years, constructs suddenly at height, outlying zone and high mountain area extensively carry out oil-gas exploration, drilling well, and leakage is frequent more, serious, controls that Lou difficulty is bigger.Statistical information according in recent years shows: almost whenever bung down leakage in various degree all will take place; Wherein, general leakage accounts for more than 50%, and a leak stopping success ratio is more than 70%; Serious leakage accounts for 20%～30%, and this type leakage often needs the success of the ability of leak stopping for several times; Pernicious leakage accounts for 10%～20%, and the loss of this type leakage accounts for more than 50% of total losses, and leak stopping is difficult to successfully.The frequency of Kaijiang-pernicious leakage in area, Xuanhan is higher, and wastage is big, and drop ply is complicated, has bored structure leakage in various degree all takes place, and 90% drilled well has leakage to show, average about 4 layers of (inferior)/well; Wherein, the drilling fluid mistake is returned, can not be set up the pernicious leakage of round-robin and accounts for 27%, and the ratio that the wastage of pernicious leakage accounts for the leakage total amount reaches 95%.Pernicious absorption well segment length, many, the drop ply of leakage interval are difficult for confirming that pernicious drop ply is controlled difficult with Louing, need long-time leak stopping, and also serious leakage causes abandoned well the most at last.The regional leakage in east, river accounts for about 65% of drilling well number, and the processing leakage time accounts for about 6% of the activity duration, and serious leakage is handled leakage a bite well and expended units up to a million up to about 20%.Tarim Basin leakage problem ubiquity, storehouse car down warping region and tower southwest piedmont tectonic belts, land disposal former saline bed and high-pressure oil gas reservoir, and drilling fluid density is up to 2.0～2.4g/cm
3, in case leakage takes place, handle very difficulty, loss is serious.The leakage of Junggar Basin south edge in Xinjiang constructing in front of the mountains takes place frequent, and the processing leakage time accounts for about 3% of rig time.Long celebrating oil field, tell the time of breathing out oilfield treatments deep-well leakage and account for about 2% of rig time, and the leak stopping success ratio only reaches about 30%, one time leakage needs repeatedly leak stopping to accomplish.
The leakage stopping technology that tackles pernicious leakage does not both at home and abroad still pass a test so far; Still mainly be dependence experience and repeatedly repetition (tens times, tens times even inferior repetition up to a hundred at present; For example China Petrochemical Industry south branch office is in the emphasis prospect pit " golden pheasant 1 well " of Liangping County, Chongqing City deployment; This well runs into special formations such as many places solution cavity, crack and underground underground river owing to bore in wellbore construction, serious pernicious leakage takes place; Spud in during the August 20 from March 8th, 2005; Fail to set up normal mud circulation, adopt method constructions such as the leak stopping of bridge slurry, lost circulation additive, grout leak stopping and foam mud leakproof 103 times once, do not reach the purpose that blocks drop ply.This well is missed working fluid 73415.5m altogether
3) build-up effect reach the purpose of leak stopping.This repetition leak stopping is stifled to need a large amount of patching materialss, waste plenty of time to cause huge leak stopping cost, and the leak stopping success ratio is not high yet.That is to say does not still have a kind of effective sophisticated leak-stopping technique technology can solve pernicious leakage so far, and pernicious leakage remains the bottleneck of restriction drilling progress, is the technical barrier of being badly in need of solution.
The technological difficulties of pernicious leakage leak stopping
The leak stopping of pernicious leakage is difficulty very; The technological difficulties of pernicious leakage leak stopping comprise following two aspects: (1) plugging agent is all had water (or mud) by water easily in rare general formation fracture solution cavity, the leak stopping fluid is generally water base, both contacts; Naturally mix mutually; Must make stifled slurry viscosity degradation more be prone to flow away towards rare with plugging agent towards rare, patching materials is more difficult to be detained near the inlet that is accumulated in the drop ply; Leakage-stop liquid is difficult to condensation cure, or setting strength is reduced greatly after rare, is difficult to support the destruction of leakage pressure reduction, thereby makes the leak stopping failure; (2) it is fast that speed is leaked in this type of leakage, and wastage is big, and patching materials is difficult near the drop ply inlet, stop because all plugging agents all must be fluids; Or must carry the arrival drop ply by fluid; Therefore, they meet this drop ply also can miss, flow into the drop ply deep in a large number, and can not near the drop ply inlet, pile up; Also just can not play the leak stopping effect in the ingress; Plugging agent has only once getting into drop ply and does not flow away and rest on drop ply inlet built-in near position, and then glued sclerosis takes place waits effect, and ability is effective.
Summary of the invention
The objective of the invention is: for can be at the big plugging agent of high temperature resistance high pressure plugging strength of the effective resident formation bridging plug of crack property and crumbliness drop ply ingress, the spy provides a kind of plugging agent and compound method that is used for pernicious leakage.
To achieve these goals; The present invention adopts following technical scheme: a kind of plugging agent that is used for pernicious leakage; It is characterized in that: preparing raw materials used component of this plugging agent and content does, its MU is gram or kilogram: hexadecyldimethyl benzyl ammonium allyl ammonium chloride 8-12; Acrylic amide 16-18; Vinylbenzene sodium sulfate 6-12; Tensio-active agent: X 2073 0.2-0.4; Initiator: Potassium Persulphate/sodium sulfite anhy 96 0.2-0.4, the mass ratio of Potassium Persulphate and sodium sulfite anhy 96 are 1:2; Bentonite clay 16-20; Fresh water 239-279.
The compound method of this plugging agent is: with acetone acrylic amide and X 2073 are carried out recrystallization earlier, with ETHYLE ACETATE the hexadecyldimethyl benzyl ammonium allyl ammonium chloride is carried out recrystallization; In reaction vessel, add hexadecyldimethyl benzyl ammonium allyl ammonium chloride 8-12 gram, acrylic amide 16-18 gram and vinylbenzene sodium sulfate 6-12 gram behind recrystallization, dissolve fully with fresh water 140-180 gram, with the pH value of NaOH solution regulation system to 6.4-6.8; In reaction vessel, fed nitrogen 30 minutes, and added initiator potassium persulfate/sodium sulfite anhy 96 0.2-0.4 gram, continue the sealing in 10 minutes of logical nitrogen and be placed in the thermostat container 40 ℃ of constant temperature, reacted 24 hours; Taking-up is used acetone precipitation after being cooled to room temperature, with acetone soln washing 3-5 time, is ground into fine particle repeatedly, soaks one day with acetone again, and 40 ℃ of vacuum-dryings obtain white copolymer to constant weight; Get 1 gram multipolymer at last, behind the fresh water dissolution with 99 grams, add tensio-active agent X 2073 0.2-0.4 gram, treat to dissolve fully the back and add bentonite clay 16-20 gram, make this plugging agent.
The plugging agent that is used for pernicious leakage provided by the invention compared with prior art; Have following beneficial effect: (1) this plugging agent has good shear thinning performance; It is prone in pipeline, drill string and in the annular space flow, and in drop ply crack and duct, moves very difficulty; (2) this plugging agent is elastomeric viscoelastic fluid, has very strong quiet yielding stress, it is flowed need overcome very big quiet yielding stress, and 80 ℃ former has very high trigger pressure, and plugging strength is high; (3) following of high-temperature and high-pressure conditions has the rare ability of very strong anti-impact, can when crack and space, duct are filled in draining, can keep original good performance; (4) can be in the crack, macropore forms effective cork, helps the effectively resident of expanding material and bridging material.The present invention can be good at the shutoff drop ply; Have also simultaneously that crushing resistance is big, the anti-salinity ability of heatproof has characteristics by force, be suitable in drilling process, carrying out leak stopping.
Embodiment
Embodiment 1: the compound method of this plugging agent:
Earlier acrylic amide and X 2073 are carried out recrystallization, the hexadecyldimethyl benzyl ammonium allyl ammonium chloride is carried out recrystallization with ETHYLE ACETATE with acetone; In reaction vessel, add hexadecyldimethyl benzyl ammonium allyl ammonium chloride 10 grams, acrylic amide 17 grams and vinylbenzene sodium sulfate 9 grams behind recrystallization earlier, with the dissolving fully of fresh water 160 grams, with the pH value to 6.5 of NaOH solution regulation system; In reaction vessel, fed nitrogen 30 minutes, and added initiator potassium persulfate/sodium sulfite anhy 96 0.2 gram, continue the sealing in 10 minutes of logical nitrogen and be placed in the thermostat container 40 ℃ of constant temperature, reacted 24 hours; Taking-up is used acetone precipitation after being cooled to room temperature, with acetone soln washing 3 times, is ground into fine particle repeatedly, soaks one day with acetone again, and 40 ℃ of vacuum-dryings obtain white copolymer to constant weight; Get 1 gram multipolymer at last, behind the fresh water dissolution with 99 grams, add tensio-active agent X 2073 0.3 gram, treat to dissolve fully the back and add bentonite clay 18 grams.Make this plugging agent.
Embodiment 2: adopt the method that tails over to measure this plugging agent towards rare degree, this invention of experiment proof has the rare ability of good anti-impact
The rare aptitude tests result of this plugging agent of table 1 anti-impact
Through to this plugging agent under differing temps and the different down concentration towards rare level determinations.The plugging agent of finding concentration 1% still has the rare ability of stronger anti-impact under the condition of high temperature.
Embodiment 3: the present invention has good resident ability, can be effectively resident near large fracture drop ply inlet;
Resident ability is to estimate the one-tenth net retention performance of plugging agent in the stratum;
Measuring method is: this plugging agent that will prepare, pour in the core holding unit that the simulation large fracture is housed (simulation fracture width 3mm) steel cylinder lower end pad one deck 10 eye mesh screens (simulation is leakage greatly) into; Core holding unit is inserted in the high temperature oven; Add ring and press 3MPa, open constant-flux pump, simulated field squeezes stifled operating mode; Displacement clear water 10ml (1PV), the amount of filtrate of mensuration displacement pump pressure and exit end
The resident ability test result of table 2
Found out that by experimental data after this plugging agent progressive die was intended the stratum, its spatial grid structure forms agent adsorbed on the rock core at the scene, puts up a bridge, is cross-linked into reticulated structure each other, forms plugged zone fast, and stronger presence is arranged, stifled layer bearing capacity is big.
Claims (2)
1. plugging agent that is used for pernicious leakage, it is characterized in that: preparing raw materials used component of this plugging agent and content does, its MU is gram or kilogram: vinylbenzene sodium sulfate 6-12; Hexadecyldimethyl benzyl ammonium allyl ammonium chloride 8-12 is with ETHYLE ACETATE the hexadecyldimethyl benzyl ammonium allyl ammonium chloride to be carried out the product behind the recrystallization; Acrylic amide 16-18 is the product that acrylic amide is carried out recrystallization with acetone; Tensio-active agent: X 2073 0.2-0.4 is the product that X 2073 is carried out recrystallization with acetone; Initiator: Potassium Persulphate/sodium sulfite anhy 96 0.2-0.4, the mass ratio of Potassium Persulphate and sodium sulfite anhy 96 are 1:2; Bentonite clay 16-20; Fresh water 239-279.
2. compound method of plugging agent according to claim 1; It is characterized in that: in reaction vessel, add hexadecyldimethyl benzyl ammonium allyl ammonium chloride 8-12 gram, acrylic amide 16-18 gram behind recrystallization earlier; Vinylbenzene sodium sulfate 6-12 gram; With the dissolving fully of fresh water 140-180 gram, with the pH value of NaOH solution regulation system to 6.4-6.8; In reaction vessel, fed nitrogen 30 minutes, and added initiator potassium persulfate/sodium sulfite anhy 96 0.2-0.4 gram, continue the sealing in 10 minutes of logical nitrogen and be placed in the thermostat container 40 ℃ of constant temperature, reacted 24 hours; Taking-up is used acetone precipitation after being cooled to room temperature, with acetone soln washing 3-5 time, is ground into fine particle repeatedly, soaks one day with acetone again, and 40 ℃ of vacuum-dryings obtain white copolymer to constant weight; Get 1 gram multipolymer at last, behind the fresh water dissolution with 99 grams, add tensio-active agent X 2073 0.2-0.4 gram, treat to dissolve fully the back and add bentonite clay 16-20 gram, make this plugging agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103106112A CN102504776A (en) | 2011-10-14 | 2011-10-14 | Lost circulation material for malignant loss and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103106112A CN102504776A (en) | 2011-10-14 | 2011-10-14 | Lost circulation material for malignant loss and preparation method |
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| CN102504776A true CN102504776A (en) | 2012-06-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289013A (en) * | 2013-05-30 | 2013-09-11 | 西南石油大学 | Gel and method thereof used for plugging and method for plugging killing well |
| WO2015018203A1 (en) * | 2013-08-09 | 2015-02-12 | 西南石油大学 | Plugging agent and preparation method thereof |
| CN105949386A (en) * | 2016-04-29 | 2016-09-21 | 西南石油大学 | Temperature-resistant and salt-resistant amphoteric hydrophobic association polymer and preparation method thereof |
| CN109796941A (en) * | 2019-01-14 | 2019-05-24 | 西南石油大学 | A kind of expansion sealing agent and preparation method thereof and microcapsule-type sealing agent and water-base drilling fluid and its application |
| CN111139046A (en) * | 2020-02-26 | 2020-05-12 | 刘小龙 | Polymer gel composite plugging agent and preparation method thereof |
-
2011
- 2011-10-14 CN CN2011103106112A patent/CN102504776A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289013A (en) * | 2013-05-30 | 2013-09-11 | 西南石油大学 | Gel and method thereof used for plugging and method for plugging killing well |
| US20160069153A1 (en) * | 2013-05-30 | 2016-03-10 | Southwest Petroleum University | Gel, leaking stoppage method using the same and well kill leaking stoppage method using the same |
| CN103289013B (en) * | 2013-05-30 | 2016-08-10 | 西南石油大学 | A kind of gel and for the method for leak stopping and the method for leak stopping kill-job |
| WO2015018203A1 (en) * | 2013-08-09 | 2015-02-12 | 西南石油大学 | Plugging agent and preparation method thereof |
| CN105949386A (en) * | 2016-04-29 | 2016-09-21 | 西南石油大学 | Temperature-resistant and salt-resistant amphoteric hydrophobic association polymer and preparation method thereof |
| CN109796941A (en) * | 2019-01-14 | 2019-05-24 | 西南石油大学 | A kind of expansion sealing agent and preparation method thereof and microcapsule-type sealing agent and water-base drilling fluid and its application |
| CN109796941B (en) * | 2019-01-14 | 2020-12-29 | 西南石油大学 | Expansion plugging agent and preparation method thereof, microcapsule type plugging agent, water-based drilling fluid and application thereof |
| CN111139046A (en) * | 2020-02-26 | 2020-05-12 | 刘小龙 | Polymer gel composite plugging agent and preparation method thereof |
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