CN101649192B - Recycled solidfree micro-foam drilling fluid or completion fluid - Google Patents

Abstract

The invention is a recycled solidfree micro-foam drilling fluid or a completion fluid, which comprises the following components in parts by weight: 1. 2-3 parts of recycled solidfree micro-foam composite treatment agent SD-LNA; 2. 0.5-1 part of low-density solidfree tackifier SD-LNV; 3 0.5-1 part of low-density modifier SD-LFD; 4. 0.5-1 part of low-density foam stabilizer SD-LFS; 5. 0.5-1 of low-density flow type modifier SD-LFR; and 6. 100 parts of water. According to a normal preparation method, the above substances are added into water successively, mixed and stirred evenly under normal temperature and normal pressure. The invention has the advantages of low density, high viscosity, small low fluid loss, good lubricating property, strong landwaste suspension property, easy maintenance, fine cleaning capability of wells, fine inhibitory capability on clay and shale, no micro-foam convergence, recycled use and the like, can be widely applied in engineering such as petroleum, geologic drilling and the like, is particularly applicable to construction technology of well drilling and well completion of low-pressure reservoir and exhausted reservoir.

Description

No solid phase and micro-foam drilling fluid or the well finishing liquid that can be recycled

One, technical field

The present invention relates to drilling fluid and well finishing liquid, particularly a kind of no solid phase and micro-foam drilling fluid or well finishing liquid that can be recycled.

Two, background technology

Along with the oil-gas exploration and development zone constantly enlarges, oil drilling is developed to low pressure, low permeability formation and exhausted stratum by rich petroliferous province gradually, in the exploratory development process of these oil reservoirs, often uses the circulative micro-foam drilling fluid technology." geology and exploration " magazine the 44th volume has been published one piece and has been entitled as the data of " circulative micro-foam mud soaks the application in the SANDSTONE URANIUM DEPOSITS on ground " in September, 2008 the 5th phase; Introduced a kind of micro-foam drilling fluid, its prescription is: the wadding fibrous plain CMC+0.1%-0.3% whipping agent of the steady foaming agent of 4%-5% prehydration bentonite slurry+0.1% sodium hydroxide+0.2%-0.3%+0.2%-0.3% medium viscosity.The shortcoming or the deficiency of above-mentioned technology are: 1. contain wilkinite in the system, need the prehydration bentonite slurry, preparation is complicated, and the waiting time is long; 2. the foamy structure that forms is loose, poor stability; 3. contain high solid phase in the foam system and be unfavorable under the pressurized condition of down-hole, keeping low density, be used for the low porosity and low permeability reservoir and at mudstone stratum hydration swelling take place very easily, great injury is caused to reservoir in gas shutoff layer duct, has influenced oil recovery factor.

Three, summary of the invention

The purpose of this invention is to provide a kind of no solid phase and micro-foam drilling fluid or well finishing liquid that can be recycled; Adopt gas, liquid two phase circulative micro-foam systems; Shortcoming or deficiency that it can overcome effectively or avoid existing in the above-mentioned prior art; Be used for the low pressure and low permeability stratum, as workover fluid, foam flooding finish, its protection hydrocarbon zone effect is more remarkable.

No solid phase and micro-foam drilling fluid or the well finishing liquid that can be recycled of the present invention, its component and content, content are weight part:

1. circulative micro-foam does not have solid phase composite treating agent SD-LNA 2-3;

2. low density does not have solid-phase tack producing agent SD-LNV 0.5-1;

3. low density regulator SD-LFD 0.5-1;

4. low density foam stablizer SD-LFS 0.5-1;

5. low density flow pattern regulator SD-LFR 0.5-1;

6. clear water 100;

Wherein, said: 1. circulative micro-foam does not have solid phase composite treating agent SD-LNA2-3, is Na ₂CO ₃: the ratio phase composite of CMC-MV: LV-CMC=0.2-0.5: 0.3-1: 1-3; 2. low density does not have solid-phase tack producing agent SD-LNV, is the ratio phase composite of CMC-HV: XC: HEC=0.5-2: 1-3: 0.5-2; 3. low density regulator SD-LFD is: AS: ABS: polymeric alcohol: F873=1-4: 2-4: 6-10: the ratio phase composite of 6-10; 4. low density foam stablizer SD-LFS is by the ratio phase composite of DFD-140: CMC-LV: PAC-HV=3-8: 6-10: 3-8; 5. low density flow pattern regulator SD-LFR is: the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: the ratio phase composite of acrylic amide and sodium acrylate copolymer=3-7: 6-10: 3-7;

Compound method: above-mentioned substance at normal temperatures and pressures, adds in the clear water with conventional compound method by its component and content successively, and mixing and stirring is for use.

The present invention has following advantage or beneficial effect compared with prior art:

1, no solid phase and micro-foam system is little to reservoir pollution, and permeability resume figure is high.

2, no solid phase and micro-foam liquid phase degree viscosity is high, and foamed elastic is good, structure is strong, good stability;

3, can form the foam stack, stop the solid phase liquid phase to get into reservoir, reservoir protection is effective;

4, in hole, reach the microfracture place and form elastica, the hole fine fisssure is sewed with leakproof, leakage leak stopping effect,

5, density is low, and no solid phase keeps density to be lower than 1.00g/cm under the pressurized condition of down-hole ³

6, microbubble has particular structural, can coalescence not become big, good rheological property, and large rock-carrying ability is strong;

7, toxicity is low, and very easily biological degradation is little to the sensitive area influence, helps environment protection

8, preparation is quick, does not need prehydration bentonite slurry and specific installation, can directly prepare at the scene, can be recycled;

9, function is many, can be used for drilling completion, TOR, workover treatment, is particularly suitable for well-completion practice.

Five, embodiment:

A kind of no solid phase and micro-foam drilling fluid or well finishing liquid that can be recycled, its component and content, content are weight part:

1. circulative micro-foam does not have solid phase composite treating agent SD-LNA 2-3;

2. low density does not have solid-phase tack producing agent SD-LNV 0.5-1;

3. low density regulator SD-LFD 0.5-1;

4. low density foam stablizer SD-LFS 0.5-1;

5. low density flow pattern regulator SD-LFR 0.5-1;

6. clear water 100;

Wherein, said: 1. circulative micro-foam does not have solid phase composite treating agent SD-LNA and is: Na ₂CO ₃: the ratio of CMC-MV: LV-CMC=0.2-0.5: 0.3-1: 1-3 is formed; 2. low density does not have solid-phase tack producing agent SD-LNV, for: the ratio of CMC-HV: XC: HEC=0.5-2: 1-3: 0.5-2 is formed; 3. low density regulator SD-LFD is: AS: ABS: polymeric alcohol: F873=1-4: 2-4: 6-10: the ratio of 6-10 is formed; 4. low density foam stablizer SD-LFS by: the ratio of DFD-140: CMC-LV: PAC-HV=3-8: 6-10: 3-8 is formed; 5. low density flow pattern regulator SD-LFR is: the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: the ratio phase composite of acrylic amide and sodium acrylate copolymer=3-7: 6-10: 3-7;

Compound method: above-mentioned substance at normal temperatures and pressures, adds in 100 parts of clear water with conventional compound method by its component and content successively, and mixing and stirring is for use.Provide specific embodiment below:

First example

1. circulative micro-foam does not have 2 parts of solid phase composite treating agent SD-LNA, by Na ₂CO ₃: CMC-MVLV-CMC=0.2: 0.3: 1 ratio is formed; 2. low density does not have solid-phase tack producing agent SD-LNV0.5 part CMC-HV: XC: HEC=0.5: 1: 0.5 ratio is formed; 3. low density regulator SD-LFD is 0.5 part, and by AS: ABS: polymeric alcohol: F873=1: 2: 6: 6 ratio is formed; 4. low density foam stablizer SD-LFS0.5 part is by DFD-140: CMC-LV: PAC-HV=3: 6: 3 ratio is combined into; 5. low density flow pattern regulator SD-LFR is the hydrolyzed polyacrylonitrile ammonium salt for 0.5 part: the amphoteric ion polymer viscosity-depression agent: the ratio of acrylic amide and sodium acrylate copolymer=3: 6: 3 is formed; Above-mentioned substance by its component and content, under the normal temperature and pressure, is added in 100 parts of clear water with conventional compound method successively, and mixing and stirring is for use.

Second example

1. circulative micro-foam does not have 2 parts of solid phase composite treating agent SD-LNA, by Na ₂CO ₃: CMC-MV: LV-CMC=0.3: 0.5: 2 ratio is formed; 2. low density does not have solid-phase tack producing agent SD-LNV0.6 part, and by CMC-HV: XC: HEC=1: 1.8: 1.5 ratio is formed; 3. low density regulator SD-LFD0.7 part, by AS: ABS: polymeric alcohol: F873=2: 2.5: 7: 7 ratio is formed; 4. low density foam stablizer SD-LFS is 0.6 part, and by DFD-140: CMC-LV: PAC-HV=5: 7: 5 ratio is formed; 5. low density flow pattern regulator SD-LFR is 0.6 part, and by the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: the ratio of acrylic amide and sodium acrylate copolymer=4: 7: 4 is formed; Above-mentioned substance, adds in 100 parts of clear water with conventional compound method under the normal temperature and pressure by its component and content successively, and mixing and stirring is for use.

The 3rd example

1. circulative micro-foam does not have 2.5 parts of the compound SD-LNA of place of solid phase, by Na ₂CO ₃: CMC-MV: LV-CMC=0.4: 0.7: 2.5 ratio is formed; 2. low density does not have solid-phase tack producing agent SD-LNV0.8 part, and by CMC-HV: XC: HEC=1.5: 2.2: 1 ratio is formed; 3. low density regulator SD-LFD is 0.9 part, and by AS: ABS: polymeric alcohol: F873=3: 3: 8: 8 ratio is formed; 4. low density foam stablizer SD-LFS is 0.75 part, and by DFD-140: CMC-LV: PAC-HV=6: 8: 6 ratio is formed; 5. low density flow pattern regulator SD-LFR0.75 part, by the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: the ratio of acrylic amide and sodium acrylate copolymer=5: 8: 5 is formed; Above-mentioned substance by its component and content, under the normal temperature and pressure, is added in 100 parts of clear water with conventional compound method successively, and mixing and stirring is for use.

The 4th example

1. circulative micro-foam does not have solid phase composite treating agent SD-LNA3 part, by Na ₂CO ₃: CMC-MV: LV-CMC=0.5: 1: 3 ratio is formed; 2. low density does not have 1 part of solid-phase tack producing agent SD-LNV, and by CMC-HV: XC: HEC=2: 3: 0.2 ratio is formed; 3. low density regulator SD-LFD0.5 part, by AS: ABS: polymeric alcohol: F873=1: 2: 6: 6 ratio is formed; 4. low density foam stablizer SD-LFS is 1 part, and by DFD-140: CMC-LV: PAC-HV=8: 10: 8 ratio is formed; 5. low density flow pattern regulator SD-LFR1 part, by the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: the ratio of acrylic amide and sodium acrylate copolymer=7: 10: 7 is formed; Above-mentioned substance by its component and content, under the normal temperature and pressure, is added in 100 parts of clear water with conventional compound method successively, and mixing and stirring is for use.

The 1st example, the 2nd example, the 3rd example are embodiment, and the 4th example is a comparative example, its each item performance test data such as following table; Can find out by following table, no solid phase and micro-foam drilling fluid or the well finishing liquid that can be recycled of the present invention, compared with prior art; Each item index of embodiment, performance all are superior.Test data is tabulated as follows:

Each item performance test data table

Embodiment	Density 3 g/cm 3	PV mPa.s	Yield value Pa	API filtration ml	Foam stabilization rate %
						The 1st example	0.80	13	7	9	92
The 2nd example	0.78	24	11	7	94
						The 3rd example	0.74	28	13	5	95
The 4th example	0.81	31	16	4	96

Claims (1)

1. a no solid phase and micro-foam drilling fluid or well finishing liquid that can be recycled, its component and content, content are weight part:

1. circulative micro-foam does not have solid phase composite treating agent SD-LNA 2-3;

2. low density does not have solid-phase tack producing agent SD-LNV 0.5-1;

3. low density regulator SD-LFD 0.5-1;

4. low density foam stablizer SD-LFS 0.5-1;

5. low density flow pattern regulator SD-LFR 0.5-1;

6. clear water 100;

Wherein, not have solid phase composite treating agent SD-LNA be Na to said 1. circulative micro-foam ₂CO ₃: CMC-MV: LV-CMC=(0.2-0.5): (0.3-1): ratio (1-3) is formed; 2. low density does not have solid-phase tack producing agent SD-LNV, is CMC-HV: XC: HEC=(0.5-2): (1-3) ratio of (0.5-2) is formed; 3. low density regulator SD-LFD is: AS: ABS: polymeric alcohol: F873=(1-4): (2-4): (6-10): ratio (6-10) is formed; 4. low density foam stablizer SD-LFS is by DFD-140: CMC-LV: PAC-HV=(3-8): (6-10): ratio (3-8) is formed; 5. low density flow pattern regulator SD-LFR is: the hydrolyzed polyacrylonitrile ammonium salt: the amphoteric ion polymer viscosity-depression agent: acrylic amide and sodium acrylate copolymer=(3-7): (6-10): ratio (3-7) is formed;

Compound method: above-mentioned substance at normal temperatures and pressures, adds in the clear water with conventional compound method by its component and content successively, and mixing and stirring is for use.