CN1247733C - Potassium-calcium composite ion inhibitor for well drilling liquid - Google Patents
Potassium-calcium composite ion inhibitor for well drilling liquid Download PDFInfo
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- CN1247733C CN1247733C CN 200310116216 CN200310116216A CN1247733C CN 1247733 C CN1247733 C CN 1247733C CN 200310116216 CN200310116216 CN 200310116216 CN 200310116216 A CN200310116216 A CN 200310116216A CN 1247733 C CN1247733 C CN 1247733C
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- drilling fluid
- potassium
- agent
- salt
- calcium
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Abstract
The present invention relates to an inhibiting agent for drilling fluid, particularly to a potassium-calcium composite ion inhibiting agent for drilling fluid. The potassium-calcium composite ion inhibiting agent for drilling fluid is mainly formed by the chemical reaction of potassium carbonate, calcium oxide and at least one kind of deflocculating agent, wherein the deflocculating agent comprises lignin compounds and lignin complex compounds or humic acid. In the present invention, K+ is an inhibiting ion, Ca<2+> is an auxiliary inhibiting ion, the traditional single inorganic salt KCL or organic salt KCOOH with a large number of anions or anion radicals which are useless at or have side effects on drilling fluid and other process steps of well drilling operation is ot adopted, but another two kinds of inorganic salt are adopted for composite preparation. On this basis, lignin or humic acid is added to form the potassium-calcium composite ion inhibiting agent for drilling fluid. The present invention provides a treating agent for inhibitive drilling fluid, which has the advantages of strong inhibiting property, no useless acid ions, no side effect on the properties of drilling fluid, no negative effect on other process steps of well drilling operation.
Description
Technical field
The present invention relates to a kind of drilling fluid inhibitor, particularly a kind of drilling fluid potassium calcium compound ion inhibitor.
Background technology
Along with progressively successively decreasing of world oil, natural gas reserves, and the increase day by day of oil gas consumption, petroleum drilling exploitation difficulty is increasing.Show that mainly the mining depth of oil well is constantly deepened along with the exhaustion of shallow table reservoir hydrocarbons reserves, bore the complex formation situation of meeting and increase that the drilling cost increase rate is bigger.
At present, in the world and domestic petroleum drilling well professional range, mud shale well section hole instability is that drilling technology is failed the problem that thoroughly solves always.A large amount of field practices show, in numerous difficulty wells, its difficult point just is well to solve mud shale well section borehole instability problems, causes that down-hole accident frequently takes place, the drilling operation comprehensive cost is very high, claim for eot, infringement hydrocarbon zone, engineering rejection well ratio be higher.
Drilling fluid has equilibrium strata pressure, carries the function of removing drilling cuttings, cooling and lubricating drill bit, protection wellbore stability and protection hydrocarbon zone in drilling operation course.Along with above-mentioned technical problem highlighting day by day in drilling operation, the development work of the development of drilling liquid technology and novel treatment agent just seems more urgent.
This just has higher requirement to the performance and the drilling fluid cost control of drilling fluid.
When boring chance water sensitivity mud shale stratum, owing to contain the clay mineral of montmorillonite, illite or illite/smectite mixed layer in this class stratum, can be under the leak-off liquid hydration of drilling fluid, expand, broken, peel off physics and the chemical action such as collapse of loosing, cause complexcase such as hole shrinkage, slump in, cause bit freezing, suppress the Lou generation of serious accident such as stratum, had a strong impact on drilling speed, increased substantially drilling cost, damaged hydrocarbon zone.
At present, the inhibitive drilling fluid system serves as to suppress core with single inorganic salt or organic salt both at home and abroad, use this kind drilling fluid by a large amount of rig-site utilization, showed certain inhibition ability, can solve the problem of water sensitivity mud shale well section hole instability to a certain extent.But, also exposed some problems, mainly show:
In the drilling fluid when adding the inhibition metal ion, the unavoidable CL that added
-, CH
3COO
-Negatively charged ion or anion radical Deng macromolecule.These negatively charged ion or anion radical do not have positive contribution to whole drilling fluid system performance.Not only take a large amount of chemical spaces, caused the quality that the interior drilling fluid of unit volume contains useless material to strengthen, and some negatively charged ion-as CL
-, negative impact is arranged for logging operation.
2. single inorganic salt or organic salt, its restraining effect in drilling fluid are that the chemical action by positively charged ion compression clay particle surface electrostatic double layer realizes.Yet, owing to inevitably contain a large amount of negatively charged ion in single inorganic salt or the organic salt, when increasing salinity, real useful positively charged ion does not increase, restraining effect to drilling fluid does not strengthen yet, and causes drilling fluid rheology and building capacity to degenerate on the contrary.In order to adjust property of drilling fluid, add a large amount of treatment agents again, increased drilling fluid cost.
Summary of the invention
The invention provides a kind of drilling fluid with potassium calcium compound ion inhibitor, purpose is a kind of strong inhibition capability to be provided, not to contain useless acid ion, property of drilling fluid to be had no side effect, other drilling operation program is not had the treatment agent of negative impact for inhibitive drilling fluid.
Drilling fluid provided by the invention is generated by salt of wormwood, calcium oxide and at least a defloculating agent after chemical reaction with potassium calcium compound ion inhibitor.
Wherein used salt of wormwood and calcium oxide are the general industry product; Defloculating agent is general industry product lignosulfonic acid iron, calcium lignin sulphonate, potassium humate.
Salt of wormwood, calcium oxide and defloculating agent are at when preparation dry product mass ratio 1: 1: 1.
Compound method of the present invention is as follows:
(1) salt of wormwood will be dissolved in an amount of H
2O adds defloculating agent then, stirs under normal temperature condition, makes two kinds of materials that chemical reaction fully take place;
(2) in above-mentioned reaction gained material, add calcium oxide, under normal temperature condition, stir, make it fully to take place chemical reaction;
(3) with above-mentioned reaction gained material, bake and bank up with earth to complete drying;
(4) will bake and bank up with earth back gained material, pulverize, be ground to 40# wire screen, obtain the present invention.
Drilling fluid provided by the invention in addition can also further contain the pitch analog derivative with potassium calcium compound ion inhibitor.
Inhibition ability to clay particle in the drilling fluid realizes by some metallic cation in the drilling fluid, its inhibition means are electrostatic double layers of compression clay particle surface, suppress the generation of its hydration, eliminate or weaken the physical action such as hydration swelling, fragmentation of mud shale.
Studies show that K by indoor mechanism
+With Ca
2+Mixing salt inhibition experiment drilling fluid has demonstrated the inhibition effect that can reach or be better than single KCL inhibitive drilling fluid to a certain extent.
Be to single kind inorganic salt and the inhibiting comparative experiments of mixing salt below indoor.
Two CST curves contrast as can be seen from accompanying drawing 1, in the higher ion scope, and K
+The inhibition dissemination compare Ca
2+Effective, but also should be noted that simultaneously, in low strength range, CaCL
2The CST measured value of test solution correspondence is lower than the CST measured value of the KCL correspondence of same concentrations, and Ca is described in low strength range
2+The inhibition dispersion effect can compare K
+Good.
The rolling dispersion experiment result that following table is provided does same comparative analysis, and its result also coincide with above-mentioned rule.
Table 1 inorganic salt test solution rolling dispersion experiment result
| Test solution | Distilled water | CaCL 2 mmol/L | KCL mmol/L | ||||||
| 35 | 105 | 140 | 210 | 35 | 140 | 350 | 420 | ||
| Shale rate of recovery % | 12.03 | 30.62 | 38.32 | 42.82 | 42.54 | 24.48 | 39.08 | 47.84 | 53.68 |
Then, keep K
+, Ca
2+420mmol/L is constant for the mixing salt total ion concentration, carries out CST test, expansion and hot rolling dispersion experiment respectively.Represent K in the mixing salt test solution with Fk
+Concentration accounts for the centinormal 1 per-cent of ion.Experimental result from accompanying drawing 2 draws when Fk is about 50%-80%, and the restraining effect effect of mixing salt system is preferable.Even be better than the inhibition ability of single KCL.
Among the present invention, be with K
+For suppressing ion, with Ca
2+Be the auxiliary ion that suppresses.
Do not use band in a large number useless or the negatively charged ion of side effect or the traditional single inorganic salt KCL or the organic salt KCOOH of anion radical are arranged, and adopt the method for other two kinds of compound preparations of inorganic salt drilling fluid and other program of drilling operation.And on this basis, sneak into xylogen or humic acid, form the present invention.Its proportioning is as follows:
Inhibition inorganic salt: complementary inorganic salt: defloculating agent=1: 1: 1
In the following formula, ratio is the dry product mass ratio.
Inhibition inorganic salt-K
2CO
3
Compatibleness material-CaO
Defloculating agent-xylogen or potassium humate
Its theoretical reaction process is:
The complex reaction formula is:
Can clearly find out the K of a material unit from above-mentioned chemical equation
2CO
3The K of two units can be provided
+, the CaCO of generation
3Precipitation both can also can reduce the add-on of special shielding diverting agent as the reservoir protection agent for drilling fluid provides the inert material that forms the high-quality mud cake.
After KOH is water-soluble, OH
-Can reduce maybe needn't add and prepare the necessary NaOH of drilling fluid for drilling fluid provides necessary basicity.Excess amount of Ca O is along with the variation of basicity constantly provides Ca
2+
On this basis, sneak into xylogen or humic acid, form drilling fluid potassium calcium compound ion inhibitor.The present invention can eliminate K
+To the throwing out of drilling fluid itself, reduce the filter loss of drilling fluid simultaneously, reduce or needn't use fluid loss agent in addition.
The present invention has following beneficial effect:
1. under the situation of suitable dosage, the present invention can reach the inhibition ability of KCL fully, can satisfy the requirement of on-the-spot drilling operation.
2. do not contain useless among the present invention or the anionic group of adverse side effect is arranged, can not cause damage drilling fluid or other drilling operation program.
3. the present invention can effectively reduce the filter loss of drilling fluid, need not or reduce the use of other fluid loss agent.
4. the CaCO that generates of recombination process
3, can provide material for forming the high-quality mud cake as the shielding diverting agent of drilling fluid, simultaneously, help protecting hydrocarbon zone.
5. the aqueous solution of the present invention is alkalescence (PH=10-12), adds drilling fluid of the present invention, and needn't add NaOH in addition provides basicity for drilling fluid.
Description of drawings
The relation of accompanying drawing 1CST measured value and concentration
Accompanying drawing 2KCL/CaCL
2Test solution test result and K
+The relation of percent concentration
Accompanying drawing 3 rate of recovery comparative experimentss
Embodiment
With the dry product mass ratio be 1: 1: 1 salt of wormwood, calcium oxide, lignosulfonic acid iron according to following step, preparation the present invention.
Step 1: salt of wormwood will be dissolved in an amount of H
2O adds defloculating agent then, stirs under normal temperature condition, makes two kinds of materials that chemical reaction fully take place;
Step 2: power adds calcium oxide in step 1 reaction gained material, stirs under normal temperature condition, makes it fully to take place chemical reaction;
Step 3:, bake and bank up with earth to complete drying with step 2 reaction gained material;
Step 4: step 3 is baked and banked up with earth back gained material, pulverize, be ground to 40# wire screen, obtain the present invention.
Be the performance test of the present invention in drilling fluid below.
The present invention is added test use the slope soil paste, test its rheological property, determine its performance contribution qualitatively drilling fluid.By experiment as can be seen, the present invention can satisfy the needs of on-the-spot wellbore construction fully.
The slope soil matrix slurry formula and the performance of table 2 preparation
| Prescription | Six speed values | AV | PV | YP | | FL | PH | |
| 4% slope soil+0.2%Na 2CO 3+0.2％NaOH+ 0.15％CMC(M)+0.2％FA-367+ 0.4％JT-888 | 60-41-35- 25-8-7 6/12 | 30 | 19 | 11 | 3/6 | 24 | 12 |
Add K
2CO
3After, the performance of experiment slurry sees Table 3
Table 3 adds K
2CO
3Back performance
| Prescription | Six speed values | AV | PV | YP | | FL | PH | |
| 4% slope soil+0.2%Na 2CO 3+0.2％NaOH+ 0.15％CMC(M)+0.2％FA-367+ 0.4％JT-888+5％K 2CO 3 | 55-34-27- 19-4-5 | 27.5 | 21 | 6.5 | 2.5/ 4.5 | 12.4 | 10 |
Following tabulation is the comparative experiments of qualitative evaluation the present invention with respect to KCL, potassium humate rheological and inhibition.From experimental data as can be seen, add drilling fluid of the present invention, its rheological and KCL, potassium humate are suitable substantially, suppress the ability aspect and are far superior to potassium humate, and under the situation of dosage than KCL low 2%, its inhibition ability is substantially near KCL.
Prescription 1#:
4% slope soil+0.2%Na
2CO
3+ 0.2%NaOH+0.15%CMC (M)+0.2%FA-367+0.4%JT-888+7%KCL
4% slope soil+0.2%Na
2CO
3+ 0.2%NaOH+0.15%CMC (M)+0.2%FA-367+0.4%JT-888+5%KCa
Prescription 3#:
4% slope soil+0.2%Na
2CO
3+ 0.2%NaOH+0.15%CMC (M)+0.2%FA-367+0.4%JT-888+5% potassium humate
Table 4 is estimated the contrast experiment
| Prescription | Six speed values | AV | PV | YP | G | FL | PH | The rate of recovery |
| 1# | 65-40-39-27-19-17 7.5/7.5 | 32.5 | 25 | 7.5 | 3.5/3.5 | 34.8 | 7 | 92.7％ |
| 2# | 55-34-27-19-4-5 4.5/8.5 | 27.5 | 21 | 6.5 | 2.5/4.5 | 12.4 | 10 | 82.7％ |
| 3# | 64-42-35-24-9-8 6/16 | 32 | 22 | 10 | 3/8 | 10.2 | 9 | ＜11％ |
The present invention and KCL inhibition contrast experiment, then nearly step explanation: reaching under the situation of certain dosage, inhibition of the present invention and KCL be (seeing the following form and accompanying drawing 3) quite.
The comparative experiments of table 5 rate of recovery
| Kind | Dosage | The rate of recovery |
| KCL | 3％ | 90.4％ |
| 5％ | 91.2％ | |
| 7％ | 92.0％ | |
| The present invention | 3％ | 69.6％ |
| 5％ | 85.2％ | |
| 7％ | 91.4％ |
Symbol and code name note in the table:
The FL:API filter loss, ml
AV: drilling fluid apparent viscosity, mPa.s
PV: drilling fluid plastic viscosity, mPa.s
YP: drilling fluid yield value, Pa
G: drilling fluid zero gel/drilling fluid 10-minute gel strength, Pa
CMC (M): carboxymethyl cellulose
FA-367: polymer coating agent
JT-888: water retaining
KCa: drilling fluid provided by the present invention potassium calcium compound ion inhibitor.
Claims (4)
1, a kind of drilling fluid is generated by salt of wormwood, calcium oxide and at least a defloculating agent after chemical reaction with potassium calcium compound ion inhibitor, and salt of wormwood, calcium oxide and defloculating agent dry product quality when preparation is 1: 1: 1 than ratio.
2, drilling fluid according to claim 1 potassium calcium compound ion inhibitor, it is characterized in that: wherein used salt of wormwood and calcium oxide are the general industry product; Defloculating agent is general industry product lignosulfonic acid iron, calcium lignin sulphonate, potassium humate.
3, drilling fluid according to claim 1 also further contains the pitch analog derivative with potassium calcium compound ion inhibitor.
4, a kind of method of preparing the described drilling fluid of claim 1 with potassium calcium compound ion inhibitor, its step is as follows:
(1) salt of wormwood will be dissolved in an amount of H
2O adds defloculating agent then, stirs under normal temperature condition, makes two kinds of materials that chemical reaction fully take place;
(2) in above-mentioned reaction gained material, add calcium oxide, under normal temperature condition, stir, make it fully to take place chemical reaction;
(3) with above-mentioned reaction gained material, bake and bank up with earth to complete drying;
(4) will bake and bank up with earth back gained material, pulverize, be ground to 40# wire screen, obtain drilling fluid potassium calcium compound ion inhibitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310116216 CN1247733C (en) | 2003-11-11 | 2003-11-11 | Potassium-calcium composite ion inhibitor for well drilling liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310116216 CN1247733C (en) | 2003-11-11 | 2003-11-11 | Potassium-calcium composite ion inhibitor for well drilling liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1616589A CN1616589A (en) | 2005-05-18 |
| CN1247733C true CN1247733C (en) | 2006-03-29 |
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ID=34760612
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310116216 Expired - Fee Related CN1247733C (en) | 2003-11-11 | 2003-11-11 | Potassium-calcium composite ion inhibitor for well drilling liquid |
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| Country | Link |
|---|---|
| CN (1) | CN1247733C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747876A (en) * | 2008-12-16 | 2010-06-23 | 西部钻探克拉玛依钻井工艺研究院 | Potassium carbonate polyamine drilling fluid |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587858B (en) * | 2012-03-09 | 2015-05-20 | 中国石油化工股份有限公司 | Method for blocking water for fracture and hole type reservoir |
-
2003
- 2003-11-11 CN CN 200310116216 patent/CN1247733C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747876A (en) * | 2008-12-16 | 2010-06-23 | 西部钻探克拉玛依钻井工艺研究院 | Potassium carbonate polyamine drilling fluid |
| CN101747876B (en) * | 2008-12-16 | 2013-07-24 | 西部钻探克拉玛依钻井工艺研究院 | Potassium carbonate polyamine drilling fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1616589A (en) | 2005-05-18 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WEST DRILLING KARAMAY DRILLING CRAFT RESEARCH INST Free format text: FORMER OWNER: DRILLING WELL TECHNOLOGY INSTITUTE, PETROLEUM ADMINISTRATION BUREAU, XINJIANG Effective date: 20090417 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090417 Address after: Hongyan road Karamay City, No. 80 the Xinjiang Uygur Autonomous Region Patentee after: Western Drilling Kelamayi Drilling Technology Institute Address before: Hongyan road Karamay City, No. 80 the Xinjiang Uygur Autonomous Region Patentee before: Research Inst of Drilling Technology, Xinjiang Petroleum Administration |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060329 Termination date: 20201111 |
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| CF01 | Termination of patent right due to non-payment of annual fee |