CN101463713A - Drilling fluid circulating and separating method for sulfur-containing stratum under-balance drilling operation - Google Patents
Drilling fluid circulating and separating method for sulfur-containing stratum under-balance drilling operation Download PDFInfo
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- CN101463713A CN101463713A CNA2009100581140A CN200910058114A CN101463713A CN 101463713 A CN101463713 A CN 101463713A CN A2009100581140 A CNA2009100581140 A CN A2009100581140A CN 200910058114 A CN200910058114 A CN 200910058114A CN 101463713 A CN101463713 A CN 101463713A
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Abstract
The invention relates to a method for cyclicaly separating drilling fluids during an underbalance drilling operation on sulfur-bearing strata, belonging to the technical field of processing drilling fluids used for sulfur-bearing oil gas wells. The separation method includes the steps of pressure control, oil, solid and gas separation, natural gas separation, sulfureted hydrogen removal, solid control and slurry proportion; and the equipment comprises a drilling fluid seal and separation system and a solid control system. The invention provides the method for cyclicaly separating the underbalance drilling fluids of the sulfur-bearing strata, which can effectively control the sulfureted hydrogen in the drilling fluids, and seal and separate stratum products; and the method solves the problems that the open treatment of the prior art generates threat to people and harm to the environment, and the method has the characteristics of complete seal treatment, cyclic utilization and on-line monitoring and accurate measurement of the stratum products with the information of the stratum conditions.
Description
Technical field: a kind of drilling fluid circulating and separating method of sulfur-containing stratum under-balance drilling operation, be used for handling sulfur-containing stratum under-balance drilling operation from the drilling fluid that contains hydrogen sulfide that the well internal return goes out, belong to the processing technology field of drilling fluid in the sulfur-bearing oil gas well drilling engineering.
Technical background: because under-balanced drilling technology can effectively be protected reservoir, improve bit speed, therefore in recent years at home each elephant obtained using widely, but, the oil gas field that China has now developed all contains hydrogen sulfide gas to some extent, the high sulfur-bearing oil gas field of the also genus that has, along with the continuous growth of petroleum resources demand and the easily depletion day by day of oil recovery gas reservoir, sulfur-bearing oil-gas reservoir will become the important resource of taking over; And under-balanced drilling technology will inevitably be widely used in the exploration and development of sulfur-bearing reservoir as effective technology of finding and protecting oil-gas Layer, and therefore using the underbalance technology at sulfur-bearing formation is a trend of petroleum resources exploration and development; In the under balance pressure drilling process, because the pressure of drilling fluid is less than strata pressure, so formation fluid will enter well and return to ground, return to the drilling fluid on ground and contain oil, gas, and the landwaste of drilling well generation, in order to safeguard the performance of drilling fluid, drilling fluid must be wherein oil, gas, separate admittedly before pumping into the down-hole once more; At present domestic mainly is that vibrosieve, desanding gas, centrifuge by liquid-gas separator, skimmer tank and solid controlling system waits and finish to the oil in the drilling fluid, gas, solid separation; Because the skimmer tank and the solid controlling system that use all are communicated with atmosphere, so, when containing hydrogen sulfide in the drilling fluid, hydrogen sulfide will volatilize to atmosphere from skimmer tank and solid controlling system, the hydrogen sulfide that volatilizees away can threaten to operating personnel and local resident's life security, environment is brought severe impairment, so containing H at present
2When drillng operation is implemented on the stratum of S, just can not adopt under-balanced drilling technology, when application underbalance technology is carried out drilling well, as run into H
2S then must stop under-balance drilling operation immediately.
Summary of the invention: the problem that the objective of the invention is to implement the under-balance drilling operation of sulfur-bearing formation at the drilling fluid surface separation method of domestic present use, adopt the mode of airtight separation, designed a kind of drilling fluid circulating and separating method that can control effectively to hydrogen sulfide in the drilling fluid, the stratum product be carried out the sulfur-containing stratum under-balance drilling operation of airtight separation.
The present invention is achieved in that separation method comprises the following steps:
The first step: the drilling fluid that at first the well internal return is gone out injects choke manifold, carries out pressure control;
Second one: the drilling fluid row that will reach design pressure is to four-phase separator, carries out the separation of oil, solid, natural G﹠W;
The 3rd step: the drilling fluid that has been excluded solid phase, crude oil and natural gas is admitted to the drilling fluid surge tank earlier, flows to vacuum degasser then the natural gas of bringing into is separated fully;
The 4th step: do not have the drilling fluid of solid phase, crude oil and natural gas to be arranged, a small amount of hydrogen sulfide that is dissolved in the drilling fluid is removed to airtight hydrogen sulfide removing jar;
The 5th step: clean drilling fluid is pumped into solidifying and controlling device carry out solid controlling and join the slurry processing, pump into well by borehole pump then and implement drilling well;
The solid phase that described four-phase separator is separated is admitted to airtight mud settling tank, and the natural gas of bringing airtight mud settling tank into is arranged to igniter to burn;
The crude oil row that described four-phase separator is separated is to oil storage tank, and the natural gas of bringing into burns to igniter from oil storage tank row;
Arranged to igniter from the described second step four-phase separator and the 3rd step natural gas separated of vacuum degasser and to be burnt;
Through above-mentioned activities, the hydrogen sulfide that contains in the drilling fluid that comes out in the down-hole, light oil and oarse-grained landwaste have been gone out with regard to separated, no longer environment and personnel are damaged, and with this continuous circulation, realize that the sealing and circulating of Under-balanced drilling fluid is separated.
The present invention is made up of airtight piece-rate system of drilling fluid and solid controlling system,
The device of implementing the sealing and circulating separation method of sulfur-bearing formation underbalanced drilling liquid according to above-mentioned separating step comprises airtight piece-rate system of drilling fluid and solid controlling system, and the airtight piece-rate system of drilling fluid comprises choke manifold, four-phase separator, airtight mud settling tank, airtight oil storage tank, airtight drilling fluid surge tank, vacuum degasser, igniter and airtight hydrogen sulfide removing jar; Solid controlling system is made of standard drilling well solidifying and controlling device;
Advantage of the present invention with beneficial effect is: in separating drilling fluid in the process of hydrogen sulfide, crude oil and natural gas, system is in air-tight state, isolated natural gas is burned, isolated oil is sealed storage, the hydrogen sulfide that is dissolved in the drilling fluid is eliminated, so not only avoided the excessive of hydrogen sulfide and caused personnel's injures and deaths, but also avoided light oil in atmosphere volatilization and cause disaster hidden-trouble; In addition, airtight piece-rate system can also be carried out on-line monitoring and accurate measurement to the stratum product, gives information for understanding strata condition.
Description of drawings:
Fig. 1 is a schematic flow sheet of the present invention.
Specific implementation method:
Provide embodiments of the invention below in conjunction with accompanying drawing:
Implement system and device of the present invention and comprise airtight piece-rate system of drilling fluid and solid controlling system composition, the airtight piece-rate system of drilling fluid comprises choke manifold 4, four-phase separator 5, airtight mud settling tank 1 and 2, airtight oil storage tank 6, airtight drilling fluid surge tank 9, vacuum degasser 8, igniter 7, airtight hydrogen sulfide removing jar 10; Solid controlling system comprises a cover standard drilling well solidifying and controlling device 11; Separation method is that the drilling fluid that contains hydrogen sulfide that the well internal return goes out is finished through the following steps:
The first step: will inject the choke manifold 4 of the airtight piece-rate system of drilling fluid from the drilling fluid that the well internal return goes out, and control pressure to designing requirement;
Second one: the drilling fluid row that will reach design pressure carries out oil to four-phase separator 5, Gu, the separation of G﹠W, crude oil row wherein is to oil storage tank 6, the small amounts of natural gas of bringing into is burnt to igniter 7 from oil storage tank 6 rows, solid matter is separated to airtight mud settling tank 1 and 2, the fluid that enters in airtight mud settling tank 1 and 2 contains drilling fluid and a small amount of gas, after static in mud settling tank 1 and 2, natural gas can be overflowed, liquid-solid also can layering, when natural gas runs up to when a certain amount of, open exhaust line, natural gas row is handled to igniter 7 burnings, the drilling fluid that is still in tank body top is discharged into timing in the drilling fluid surge tank 9; Solid phase particles is then stayed the bottom of mud settling tank 1 and 2, if after the solid phase amount in mud settling tank 1 and 2 surpasses design flow, close this jar, and is transported to jar in the well site outside or stops and handle behind the brill;
The 3rd step: the drilling fluid that has been excluded solid phase, crude oil and natural gas is arranged to drilling fluid surge tank 9 from four-phase separator 5 and airtight mud settling tank 1 and 2 respectively, flowing to the micro-bubble that vacuum degasser 8 will be dissolved in the drilling fluid then separates, separated natural gas is arranged to igniter 7 burnings, and the drilling fluid of handling pumps into airtight hydrogen sulfide again and removes jar 10;
The 4th goes on foot: be pumped to the drilling fluid that airtight hydrogen sulfide is removed jar 10, here, hydrogen sulfide is removed jar 10 and will be dissolved in the drilling fluid, also not by complete isolated residual hydrogen sulfide, by the method for adding chemical agent it is removed; Drilling fluid after hydrogen persulfide is removed jar 10 processing has not contained the hazardous substances of stratum output, becomes the drilling fluid of " totally ";
The 5th step: remove jar 10 clean drilling liquid flows that come out from airtight hydrogen sulfide and carry out conventional solid controlling and join the slurry processing, pump into well by borehole pump then and implement drilling engineering to the standard solidifying and controlling device;
Through above-mentioned activities, the hydrogen sulfide that contains in the drilling fluid that comes out in the down-hole, light oil and oarse-grained landwaste have been gone out with regard to separated, no longer environment and personnel are damaged, and with this continuous circulation, realize that the sealing and circulating of Under-balanced drilling fluid is separated.
Claims (5)
1. the drilling fluid circulating and separating method of a sulfur-containing stratum under-balance drilling operation, it is characterized in that: separation method comprises the following steps:
The first step: the drilling fluid that at first the well internal return is gone out injects choke manifold, carries out pressure control;
Second one: the drilling fluid row that will reach design pressure is to four-phase separator, carries out the separation of oil, solid, natural G﹠W;
The 3rd step: the drilling fluid that has been excluded solid phase, crude oil and natural gas is admitted to the drilling fluid surge tank earlier, flows to vacuum degasser then the natural gas of bringing into is separated fully;
The 4th step: do not have the drilling fluid of solid phase, crude oil and natural gas to be arranged, a small amount of hydrogen sulfide that is dissolved in the drilling fluid is removed to airtight hydrogen sulfide removing jar;
The 5th step: clean drilling fluid is pumped into solidifying and controlling device carry out solid controlling and join the slurry processing, pump into well by borehole pump then and implement drilling well.
2. the circulating and separating method of sulfur-bearing formation underbalanced drilling liquid according to claim 1 is characterized in that: the solid phase that described four-phase separator is separated is admitted to airtight mud settling tank, and the natural gas of bringing airtight mud settling tank into is arranged to igniter to burn.
3. the circulating and separating method of sulfur-bearing formation underbalanced drilling liquid according to claim 1 is characterized in that: the crude oil row that described four-phase separator is separated is to oil storage tank, and the natural gas of bringing into burns to igniter from oil storage tank row.
4. the circulating and separating method of sulfur-bearing formation underbalanced drilling liquid according to claim 1 is characterized in that: arranged to igniter from the described second step four-phase separator and the 3rd step natural gas separated of vacuum degasser and burn.
5. the circulating and separating method of sulfur-bearing formation underbalanced drilling liquid according to claim 1, it is characterized in that: the device of implementing described separation method comprises airtight piece-rate system of drilling fluid and solid controlling system, and the airtight piece-rate system of drilling fluid comprises choke manifold, four-phase separator, airtight mud settling tank, airtight oil storage tank, airtight drilling fluid surge tank, vacuum degasser, igniter and airtight hydrogen sulfide removing jar; Solid controlling system is made of standard drilling well solidifying and controlling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100581140A CN101463713A (en) | 2009-01-13 | 2009-01-13 | Drilling fluid circulating and separating method for sulfur-containing stratum under-balance drilling operation |
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| CNA2009100581140A CN101463713A (en) | 2009-01-13 | 2009-01-13 | Drilling fluid circulating and separating method for sulfur-containing stratum under-balance drilling operation |
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| CN101463713A true CN101463713A (en) | 2009-06-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152251A (en) * | 2017-07-12 | 2017-09-12 | 中国石油集团川庆钻探工程有限公司 | The emergency processing method of hydrogen sulfide in the circulatory system of Under-balanced drilling fluid ground |
| CN107152250A (en) * | 2017-07-12 | 2017-09-12 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide sweep-out method in the drilling fluid of sulfur-bearing formation drillng operation |
| CN107165595A (en) * | 2017-07-12 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司 | The closed sweep-out method of pernicious gas in drilling fluid |
| CN107178327A (en) * | 2017-07-12 | 2017-09-19 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide separator in drilling fluid |
| CN107191147A (en) * | 2017-07-12 | 2017-09-22 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide in drilling fluid removes system |
| CN111140227A (en) * | 2019-11-06 | 2020-05-12 | 中国石油集团川庆钻探工程有限公司 | Rapid logging rock debris collecting method for closed drilling circulation system of sulfur-containing stratum |
| CN111206891A (en) * | 2019-11-06 | 2020-05-29 | 中国石油集团川庆钻探工程有限公司 | Closed automatic rock debris collecting device for sulfur-containing stratum |
-
2009
- 2009-01-13 CN CNA2009100581140A patent/CN101463713A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107152251A (en) * | 2017-07-12 | 2017-09-12 | 中国石油集团川庆钻探工程有限公司 | The emergency processing method of hydrogen sulfide in the circulatory system of Under-balanced drilling fluid ground |
| CN107152250A (en) * | 2017-07-12 | 2017-09-12 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide sweep-out method in the drilling fluid of sulfur-bearing formation drillng operation |
| CN107165595A (en) * | 2017-07-12 | 2017-09-15 | 中国石油集团川庆钻探工程有限公司 | The closed sweep-out method of pernicious gas in drilling fluid |
| CN107178327A (en) * | 2017-07-12 | 2017-09-19 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide separator in drilling fluid |
| CN107191147A (en) * | 2017-07-12 | 2017-09-22 | 中国石油集团川庆钻探工程有限公司 | Hydrogen sulfide in drilling fluid removes system |
| CN107165595B (en) * | 2017-07-12 | 2020-04-10 | 中国石油集团川庆钻探工程有限公司 | Method for hermetically removing harmful gas in drilling fluid |
| CN111140227A (en) * | 2019-11-06 | 2020-05-12 | 中国石油集团川庆钻探工程有限公司 | Rapid logging rock debris collecting method for closed drilling circulation system of sulfur-containing stratum |
| CN111206891A (en) * | 2019-11-06 | 2020-05-29 | 中国石油集团川庆钻探工程有限公司 | Closed automatic rock debris collecting device for sulfur-containing stratum |
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Application publication date: 20090624 |