CN100500795C - Gas well completion fluid for well drilling in oil field - Google Patents
Gas well completion fluid for well drilling in oil field Download PDFInfo
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- CN100500795C CN100500795C CNB2006100722520A CN200610072252A CN100500795C CN 100500795 C CN100500795 C CN 100500795C CN B2006100722520 A CNB2006100722520 A CN B2006100722520A CN 200610072252 A CN200610072252 A CN 200610072252A CN 100500795 C CN100500795 C CN 100500795C
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Abstract
The invention relates to a gas-well completion fluid to solve the problem that the present gas-well completion fluid has heavily corroded the downhole equipment and oil pipe and has badly polluted the environment, which is characterized in that it consists of the following components proportioning by mass percentage: 0.5 %-2 % cationic polymer of quaternary ammonium salt, 0.5 % -4 % erinitrit, 1 %-2 % cellulose sodium salt or carboxymethyl hydroxyethyl cellulose, and the other is water. The invention has reached its invention purpose of protecting reservoir bed, reducing pollution and corrosion to the downhole equipment, solved the well completion fluid margin of our country in gas-well application and provided powerful guarantee for gas well of high and stable yield.
Description
Technical field:
The present invention relates to a kind of gas well completion fluid of using in the oil drilling field.
Background technology:
The well finishing liquid product is widely used in the exploration operation process of borehole operation such as perforation kill-job, well-flushing, well workover and Pressure Curve in Oil Testing Well; can prevent reservoir clay mineral hydration swelling well and disperse migration; pollute reducing reservoir completions; the protection reservoir, raising oil gas well output, injectability, raising recovery ratio have important role.Along with the minimizing of petroleum resources and deepening continuously of oil field prospecting work, obtaining breakthrough progress aspect the deep layer gas finding in recent years, on five kinds of reservoirs in geographic four layer positions such as Song Fangtun, peaceful, Wang Jia village, obtain industrial gas, developed a lot of high gas rate wells.In the construction process of these gas wells, well finishing liquid occurred the tubing and casing seriously corroded has been reached the phenomenon that well finishing liquid pours in down a chimney to the stratum in the kill-job construction process.Find that oil pipe has the serious pitting corrosion of part area.Conventional high-density well finishing liquid is the bivalent metal halide completion brine, and the peculiar point corrosion of halogenide salt solution when running into the High Temperature High Pressure gas well, can cause serious pitting corrosion to downhole tubular goods.And most bivalent metal halide completion brines in running into local water carbonate and form precipitation during sulfate radical easily, not only cause reservoir infringement in various degree, reduce effective permeability.And in construction process, cause construction to be hampered easily.
Summary of the invention:
In order in formation testing gas testing process, to protect reservoir better; minimizing is to reservoir pollution; minimizing is to the corrosion failure of underground equipment and oil pipe; the invention provides a kind of gas well completion fluid; this product reaches the protection reservoir, reduces and pollute, reduce the corrosive goal of the invention to underground equipment; solved the blank of China's well finishing liquid in gas well is used, for the stable high yield of gas well provides strong assurance.
Technical scheme of the present invention is: this gas well completion fluid, it is characterized in that: comprise following component, following each component is proportioning by mass percentage: quaternary ammonium salt cationic polymkeric substance 0.5%～2%, Sodium Nitrite 0.5%～4%, cellulose sodium salt or carboxymethyl hydroxyethyl cellulose 1%～2%, surplus are water.
Also comprise SODIUMNITRATE 5%～46% in the above-mentioned scheme; The molecular weight of quaternary ammonium salt cationic polymkeric substance is 7000～22000.
The present invention has following beneficial effect: the present invention adopts technique scheme, and the mutual compatibleness of various raw materials is good, and gas well completion fluid and stratum compatibleness are good.This product reaches the protection reservoir, reduce to pollute, reduces the corrosive goal of the invention to underground equipment, has solved the blank of China's well finishing liquid in gas well is used, for the stable high yield of gas well provides strong assurance.
The well finishing liquid chamber of experimentizing that makes with technique scheme is detected, and detection method and experiment condition are as follows:
1, density: detect by 2.3.3 clause regulation among the GB/T 4472-1984.
2, pH value: detect with accurate pH test paper, measure three times, average.
3, rock core infiltration recovery rate:
3.1 laboratory apparatus and material: a) core flow test device: SM-1 type or like product; B) vacuum pump; C) kerosene; D) strainer; E) millipore filtration: 0.2 μ m aperture; F) formation core; G) drilling machine: can bore φ 25 * L50mm rock core; H) slicing machine; I) Constant Temp. Oven: room temperature～200 ℃.
3.2 determination step:
Drill through standard rock core (specification Φ 25mm * L50mm), measure its actual diameter and length.
Good rock core dries to constant weight under 120 ℃ ± 3 ℃ temperature with cutting mill.
Dried rock sample with the vacuum pump saturated kerosene of finding time, is calculated its porosity simultaneously.
Rock core is put into the core flow test device, selects convenient pressure with kerosene forward displacement rock core, to displacement volume 20～50 times greater than volume of voids, and pressure comparatively constant till, core permeability is surveyed in the back, note is made K
1
With the kerosene in the well finishing liquid sample reverse displacement rock core, to displacement volume 20～50 times greater than volume of voids, and pressure is comparatively constant, use the well finishing liquid in the kerosene forward displacement rock core afterwards again, to displacement volume 20～50 times greater than volume of voids, and pressure is comparatively constant, surveys the rate of permeation of this moment, and note is made K
2
3.3 calculate:
Rock core infiltration recovery rate by formula (1) is calculated.
K＝(K
2/K
1)×100……………………………(1)
In the formula: K---recovery of core permeability, %;
K
1---with recording core permeability after the displacement of kerosene forward, μ m
2
K
2---with the core permeability that records with the displacement of kerosene forward again behind the well finishing liquid reverse displacement, μ m
2
4, erosion rate: the mensuration of erosion rate is undertaken by the HG/T2159-1991 regulation.
5, filter loss: measure and calculate filter loss by the method for stipulating among the SY/T5621-1993.
6, relative expansion rate:
6.1 laboratory apparatus and medicine: a) graduated vessels: 50mL tool plug measuring graduates; B) balance: sensibility reciprocal is 0.01g; C) clay: meet the one-level wilkinite in the SY/T 5060-1993 standard.
6.2 testing sequence:
Take by weighing 4.0g (accurately to 0.01g) and be dried to the clay of constant weight in advance under 120 ℃ ± 2 ℃ temperature, pour in the cleaning exsiccant tool plug measuring graduates, rolling is real gently, reads clay volume, and note is made V
0
In tool plug measuring graduates, pour the 40mL well finishing liquid into, fully shake up immediately, static, make clay under the room temperature in well finishing liquid aquation 24h.Sway during this time 5 times, the time is 0.5h, 1h, 2h, 6h, 8h after adding well finishing liquid respectively.Leave standstill the volume cost that reads clay behind the 24h again, this value note is made V
1
Do blank assay with tap water simultaneously, with tap water aquation clay, leave standstill 24h after the volume cost note make V
2
6.3 method of calculation:
Relative expansion rate by formula (2) is calculated.
ψ＝[(V
1-V
0)/(V
2-V
0)]×100…………………(2)
In the formula: ψ-relative expansion rate, %;
Vo-clay original volume, mL;
V
1Clay volume behind 24h during-well finishing liquid aquation clay, mL;
V
2Clay volume behind 24h during-tap water aquation clay, mL.
7, apparent viscosity:
Measure and calculate apparent viscosity by the method for stipulating among the SY/T 5621-1993.
Experimental result sees Table 1:
Table 1
| Sequence number | Project | Index |
| 1 | Density, g/cm 3 | 1.00～1.36 |
| 2 | The pH value | 6～9 |
| 3 | Core infiltration recovery rate, % | ≥80 |
| 4 | Erosion rate, g/m 2·h | ≤0.1 |
| 5 | Filter loss, mL | ≤20 |
| 6 | The relative expansion rate, % | ≤20 |
| 7 | Apparent viscosity, mpa.s | ≤20 |
Embodiment:
The invention will be further described below in conjunction with embodiment: this gas well completion fluid comprises following component, following each component is proportioning by mass percentage: quaternary ammonium salt cationic polymkeric substance 0.5%～2%, Sodium Nitrite 0.5%～4%, cellulose sodium salt or carboxymethyl hydroxyethyl cellulose 1%～2%, surplus are water.
Above-mentioned quaternary ammonium salt cationic polymkeric substance is polymerized by epoxy chloropropane and methylamine as clay stabilizer, its molecular weight is between 7000～22000, after adding this clay stabilizer among the present invention, anti-swollen effect increases substantially, and the relative expansion rate is less than below 20%; Sodium Nitrite is as inhibiter, select this inhibiter for use after, significantly reduce corrodibility, corrosion can reduce more than 10 times, this inhibiter also can be with other nitrite replacements; Cellulose sodium salt or carboxymethyl hydroxyethyl cellulose are as fluid loss agent, and this fluid loss agent can significantly reduce filter loss, and surplus is a water.
Require difference according to drilling well, add SODIUMNITRATE 5%～46% and be used for regulating density in this well finishing liquid, select this weighting agent for use, the density of gas well completion fluid is at 1.00g/cm
3～1.36g/cm
3Between can adjust.SODIUMNITRATE also can replace with other nitrate.
Be the laboratory experiment situation below:
One, corrosion experiment:
Under static conditions, adopt hanging slice method, selected inhibiter to be tested, test(ing) medium calculates erosion rate for contrast well finishing liquid (get at the Pressure Curve in Oil Testing Well scene) and gas well completion fluid, and the experiment situation sees the following form.(the gas well completion liquid formula is a fluid loss agent 1.5%, clay stabilizer 1%, surplus is a water)
Inhibiter optimization experiment data and phenomenon
Table 2
| Sequence number | The well finishing liquid type | Inhibiter kind and concentration | Density g/cm 3 | The pH value | Temperature ℃ | Soak time h | Erosion rate g/m 2.h |
| 1 | Common well finishing liquid | Blank | 1.25 | 7.35 | 20 | 72 | 0.2817 |
| 2 | Common well finishing liquid | 0.5％HJ | 1.25 | 8.22 | 20 | 72 | 0.1496 |
| 3 | Gas well completion fluid | 0.6% Sodium Nitrite | 1.25 | 8.19 | 20 | 72 | 0.0179 |
| 4 | Gas well completion fluid | 2% Sodium Nitrite | 1.25 | 8.10 | 20 | 72 | 0.0092 |
| 5 | Gas well completion fluid | 4% Sodium Nitrite | 1.25 | 8.08 | 20 | 72 | 0.0085 |
As seen from the above table, identical in experimental temperature, under the identical situation of soak time, the corrosion mitigating effect of inhibiter Sodium Nitrite is best.
Two, relative expansion rate experiment:
Test the standard sodium bentonite that used clay produces for Xinjiang Xia Zijie.With clay stabilizer and with the anti-swollen experiment of clay stabilizer do contrast.The relative expansion rate is more little, and it is strong more to illustrate that well finishing liquid suppresses the clay swelling ability.The experiment situation sees the following form.(the gas well completion liquid formula is an inhibiter 2%, fluid loss agent 1.5%, surplus is a water)
Well finishing liquid is prevented swollen experimental data
Table 3
The anti-swollen effect that gas well completion fluid can be described by last table is better than common well finishing liquid.PTA is the quaternary ammonium salt cationic polymkeric substance.
Three, filter loss experiment:
Two kinds of fluid loss agents, join in the gas well completion fluid (the gas well completion liquid formula is a weighting agent 15%, inhibiter 2%, clay stabilizer 1%) by different ratios, the test filtration property, experimental result sees the following form.
The leak-off experimental data
Table 4
| Sequence number | Fluid loss agent | Concentration % | Viscosity mpa.s | Filter loss mL/30min |
| 1 | Carboxymethyl hydroxyethyl cellulose | 1 | 145 | 68 |
| 2 | Carboxymethyl hydroxyethyl cellulose | 1.5 | 184 | 56 |
| 3 | Carboxymethyl hydroxyethyl cellulose | 2 | 226 | 50 |
| 4 | Cellulose sodium salt | 1 | 12 | 19 |
| 5 | Cellulose sodium salt | 1.5 | 35 | 15 |
| 6 | Cellulose sodium salt | 2 | 60 | 14 |
Can be better by last table explanation cellulose sodium salt filtration reduction than carboxymethyl hydroxyethyl cellulose.
The invention effect:
Select this weighting agent for use, the density of gas well completion fluid is at 1.00g/cm
3～1.36g/cm
3Between can adjust; After adding selected clay stabilizer, anti-swollen effect increases substantially, and the relative expansion rate is less than below 20%; After selecting above-mentioned inhibiter for use, significantly reduce corrodibility, corrosion can reduce more than 10 times; Select for use cellulose sodium salt as fluid loss agent, can significantly reduce filter loss.More than the mutual compatibleness of various raw materials good, gas well completion fluid and stratum compatibleness are good.This product reaches the protection reservoir, reduce to pollute, reduces the corrosive goal of the invention to underground equipment, has solved the blank of China's well finishing liquid in gas well is used, for the stable high yield of gas well provides strong assurance.
Gas well completion fluid field experiment situation:
3823.0～3815.5m well section of Xu Shen 602 wells is to use water flushing, and leakage phenomena is serious, reaches 2.7m
3/ h, construction process do over again twice, and core permeability is low, are 0.076 * 10
-3μ m
23685.5～3657.0 well section gas testing construction processs use gas well completion fluid 280m
3, whole construction course is smooth, and leakage is slight, has only 0.03m
3/ h, core permeability improves relatively, is 0.54 * 10
-3μ m
2, after tubing and casing and subsurface tool trip out, almost do not have corrosion.
Used prescription is: weighting agent SODIUMNITRATE add-on is 21%; The clay stabilizer add-on is 1%; Inhibiter Sodium Nitrite add-on 2%; Fluid loss agent cellulose sodium salt add-on 1.5%, surplus are water.
Gas well completion fluid is in the geographic field experiment effect comparison of the tame defensive wall of Xu
Table 5
Above data are to measure according to China National Petroleum Corporation's proposed standard, and standard is that SY/T6292-1997 exploration well oil test test data is explained and grade estimation.
Claims (2)
1, a kind of gas well completion fluid, it is characterized in that: comprise following component, following each component is proportioning by mass percentage: the quaternary ammonium salt cationic polymkeric substance 0.5%～2% that is polymerized by epoxy chloropropane and methylamine, its molecular weight is between 7000～22000, Sodium Nitrite 0.5%～4%, cellulose sodium salt or carboxymethyl hydroxyethyl cellulose 1%～2%, surplus are water.
2, gas well completion fluid according to claim 1 is characterized in that: also comprise SODIUMNITRATE 5%～46%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100722520A CN100500795C (en) | 2006-04-17 | 2006-04-17 | Gas well completion fluid for well drilling in oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100722520A CN100500795C (en) | 2006-04-17 | 2006-04-17 | Gas well completion fluid for well drilling in oil field |
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|---|---|
| CN1827731A CN1827731A (en) | 2006-09-06 |
| CN100500795C true CN100500795C (en) | 2009-06-17 |
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|---|---|---|---|
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|---|---|
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109777388B (en) * | 2017-11-15 | 2021-02-02 | 中石化石油工程技术服务有限公司 | Nitrate composite completion fluid with field fertilizing effect and preparation method thereof |
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Non-Patent Citations (6)
| Title |
|---|
| 含阳离子基团的钻井液处理剂研究进展. 杨小华等.精细石油化工进展，第2卷第6期. 2001 |
| 含阳离子基团的钻井液处理剂研究进展. 杨小华等.精细石油化工进展，第2卷第6期. 2001 * |
| 环氧氯丙烷－二甲胺阳离子聚合物的合成. 马喜平等.高分子材料科学与工程，第12卷第4期. 1996 |
| 环氧氯丙烷－二甲胺阳离子聚合物的合成. 马喜平等.高分子材料科学与工程，第12卷第4期. 1996 * |
| 稳定粘土用季铵型阳离子聚合物. 张黎明.石油与天然气化工，第24卷第1期. 1995 |
| 稳定粘土用季铵型阳离子聚合物. 张黎明.石油与天然气化工，第24卷第1期. 1995 * |
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