CN102733794A - Method for exploring sand surfaces by trying to squeeze sand compartments - Google Patents
Method for exploring sand surfaces by trying to squeeze sand compartments Download PDFInfo
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- CN102733794A CN102733794A CN2012102552074A CN201210255207A CN102733794A CN 102733794 A CN102733794 A CN 102733794A CN 2012102552074 A CN2012102552074 A CN 2012102552074A CN 201210255207 A CN201210255207 A CN 201210255207A CN 102733794 A CN102733794 A CN 102733794A
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Abstract
The invention relates to a method for exploring sand surfaces by trying to squeeze sand compartments, which is characterized in that the method at least comprises the following steps: step 1, waiting sand setting; step 2, trying to squeeze the sand compartments; and step 3, exploring the sand surfaces; the step 1 of waiting the sand setting comprises the following steps: pumping squeezed sand compartments simultaneously through oil sleeves after completing the sand setting; if squeezing is tried for many times and pressure is 10Mpa more than fracture pressure of transformed layers, determining that the transformed layers are blocked effectively; finally, schlepping an underground tool string so as to explore the sand surfaces by a continuous pipe until reaching to a position 5 meters below to-be-transformed perforations; if the sand surfaces are not appeared, processing transformation on a next layer. According to the invention, sealing conditions of the transformed layer are determined through two steps of trying to squeeze the sand compartments and exploring the sand surfaces; because steps are improved, construction time is saved while ensuring effective sealing.
Description
Technical field
The present invention relates to press in exploration of oil and gas field and the development field a kind of method of back spy sand face, is after aiming at coiled tubing jetting back-up sand separate stratum fracfturing construction, is a kind of method of visiting the sand face through the crowded sand plug of examination of confirming that the effective packing property of interlayer designs.
Background technology
Continuous jetting back-up sand separate stratum fracfturing technology forms the packing of sand plug realization interlayer through owing to replace after pressure, be the validity of confirming the packing of sand plug, and conventional way is to take the downhole tool string through coiled tubing to carry out reality spy sand face.Visit the risk that bit freezing perhaps possibly take place less than the sand face but this method exists, bring very big economic cost and construction risk for the construction in later stage.Think that the conventional sand face method of visiting is not suitable for confirming after coiled tubing is pressed whether the sand face satisfies the requirement of effective packing.
Summary of the invention
The objective of the invention is: for continuous back-up sand separate stratum fracfturing technology provides one one kinds to visit the method for sand face and confirm the effective packing of interlayer through trying to squeeze the sand plug.This method confirms that through trying to squeeze sand plug pressure rising situation whether construction layer is by effective shutoff; Effectively visiting the sand face after the shutoff just can directly transform following one deck less than the sand face to waiting to transform five meters spies below the interval; When guaranteeing the effective packing of interlayer; Practice thrift the engineering time, realized the efficient pressure break of coiled tubing to a certain extent; Solved coiled tubing simultaneously and visited less than the sand face, perhaps visited the risk of sand process bit freezing with tradition spy sand face (the real sand face position of visiting).
Technical scheme of the present invention is: a kind of method of squeezing sand plug spy sand face through examination, and it is characterized by: this method may further comprise the steps at least:
The first step: wait for sand setting;
Second step: the sand plug is squeezed in examination;
The 3rd step: visit the sand face;
Said wait sand setting: treat to squeeze the sand plug by oil jacket infusion examination simultaneously after sand setting is accomplished; If repeatedly examination is squeezed; Pressure rises to the above 10Mpa of perforated interval fracture pressure that constructs; Then confirm to have constructed perforated interval by effective shutoff; Adopt coiled tubing to carry the downhole tool string at last and visit the sand face to waiting to transform below the perforated interval five meters; If do not meet sand face, the transformation that then can wait to transform perforated interval.
Described examination is waited for sand setting 4 hours before squeezing the sand plug.
The sand plug is squeezed in described examination, and whether the perforated interval of confirming to have constructed is during by effective shutoff, and coiled tubing float amount 100-150L/min, annular space are with 0.3m
3The discharge capacity of/min, pump notes boosting sand plug puts in place simultaneously, if the sand plug puts in place; Termination of pumping when pressure rises to the above 10Mpa of the perforated interval fracture pressure of constructing; After pressure dropped to below the 20Mpa, the sand plug was squeezed in examination once more, and pressure reaches 10Mpa on the perforated interval fracture pressure of having constructed once more; Confirm that then the sand plug puts in place, the perforated interval of promptly having constructed is by effective packing.
During described spy sand face, following coiled tubing is visited the sand face to waiting to transform perforated interval below five meters, if visit less than the sand face, then can wait to transform the transformation of perforated interval, if perforated interval is buried, or pocket stay inadequately, then carry out the sand washing operation.
Beneficial effect of the present invention: particularly important link is promptly confirmed the special use spy sand surface technology of the validity of sand plug layering in a kind of suitable coiled tubing back-up sand separate stratum fracfturing; Changed in the past according to directly transferring the real limitation of visiting the method for sand face of tubing string behind the sand setting; Utilize examination to squeeze in the sand plug process pressure rising situation and wait to transform below the interval five meters whether have the sand plug, confirm the validity of interlayer packing layering.This method can guarantee to transform the packing effect of layer on the one hand, can not damage transforming layer on the other hand.This method is as a kind of new spy sand face method; Do not find the domestic correlation theory research that has at present as yet; Visit sand face method through trying to squeeze the sand plug; For in the back-up sand layering reliability of coiled tubing back-up sand separate stratum fracfturing technology foundation is provided to a certain extent, for this new technology applying in the straight well directional well played certain facilitation.
Description of drawings
To combine embodiment that the present invention is further described below.
Fig. 1 is the construction sketch map of the embodiment of the invention,
Among the figure: 1, the perforated interval of having constructed; 2, sand face; 3, perforated interval to be transformed; 4, wait to transform following five meters of perforated interval.
The specific embodiment
Embodiment 1
A kind of method of squeezing sand plug spy sand face through examination, it is characterized by: this method may further comprise the steps at least:
The first step: wait for sand setting;
Second step: the sand plug is squeezed in examination;
The 3rd step: visit the sand face;
Said wait sand setting: treat to squeeze the sand plug by oil jacket infusion examination simultaneously after sand setting is accomplished; If repeatedly examination is squeezed; Pressure rises to the above 10Mpa of perforated interval 1 fracture pressure that constructs; Then confirm to have constructed perforated interval 1 by effective shutoff; Adopt coiled tubing to carry the downhole tool string at last and visit the sand face to waiting to transform below the perforated interval five meter 4; If do not meet sand face 2, the transformation that then can wait to transform perforated interval 3.
As shown in Figure 1, carried out coiled tubing back-up sand separate stratum fracfturing shakedown to Su Lige gas field a bite development well SD3-69xx well in May, 2012, the disposable success of sand plug layering.Special-purpose wellhead assembly of the coiled tubing pressing crack construction of long celebrating down-hole independent research and downhole tool are adopted in test; The validity of the sand plug layering new-type spy sand face method of having recovered the oil is confirmed in construction midway; I.e. examination is squeezed the sand plug and is visited sand face method, every layer of sand plug pressure testing twice, and pressure rises obviously; Visit the sand face after the pressure testing to waiting to transform below the interval five meter 4, do not meet sand.
Three layers of this well constructions, twice back-up sand layering, the 2 times main pressing crack constructions in mountain finish on back-up sand layering mountain, back 2 times, the mountain 2; On the mountain 2 main pressing crack construction finish on the back-up sand layering mountain, back 2,8 layers in box.
Existing with on this well mountain 2,8 liang of interlayers of box squeeze the sand plug through examination and visit sand face method invention is done with explanation.
(1) main pressure break finishes on the mountain 2, sand setting after the back-up sand.
On the mountain 2: 2964.0-2964.5m presses the back through owing to replace formation sand plug, coiled tubing
On carry 200 meters and wait for sand setting to the 2264m closing well.
The back-up sand concluding time (closed-in time) on the mountain 2: on May 22nd, 2012 17:00;
(2) the sand plug is squeezed in examination.
Examination is for the first time squeezed: on May 22nd, 2012 19:30, promptly sand setting is 2.5 hours.
Oil jacket squeezes sand plug, sleeve pipe discharge capacity 0.3m with annotating examination
3/ min, coiled tubing discharge capacity 0.15m
3/ min pressure testing, the sand of compacting simultaneously plug changes judgement through pressure test pressure, and there is the unlatching phenomenon in the lower floor crack, sand plug sedimentations such as termination of pumping continuation.
The unsuccessful analysis of causes of sand plug is squeezed in examination: 2.5 hours sand setting time, the sand setting time is not enough.
Reagent for the second time: on May 22nd, 2012 21:00, promptly add up sand setting 4 (2.5+1.5) hour.
Sleeve pipe discharge capacity 0.3m
3/ min, coiled tubing discharge capacity 0.15m
3/ min pressure testing, the sand of compacting simultaneously plug, twice pressure testing rises to 42MPa (fracture pressure 31.8MPa on the mountain 2), and pressure testing is qualified, prepares to visit the sand face;
Sand setting above 10MPa of fracture pressure on pressure testing to the construction section mountain 2 after 4 hours, the crowded sand plug of examination is qualified.
(3) visit the sand face.
Coiled tubing is taken the downhole tool string and is visited the sand face, coiled tubing lowering velocity 13m/min,
(being not more than 15 m/min in theory), continuous repeatedly oil pipe discharge capacity 100L/min, following coiled tubing to 2850 meter (about 80 meters) apart from design sand face position; Stopping the coiled tubing pump annotates; Continue probing sand face down, visit to 2970 meters coiled tubing suspending weight no change; Explain and wait to transform 8 layers in layer box not by sand plug landfill, and box 8 perforated intervals: leave five Gueldenstaedtia vernas below the 2964-2964.5m at least.
Before in other work progresss; Adopted direct spy to the method for transforming aspect, but this method damages easily to transformation face, make original packing face produce the cavity; Therefore adopted and visited to method apart from five meters in packing face; The result shows that this method is respond well, can not damage packing face.
To sum up, squeeze sand plug spy sand face method with examination and can satisfy fully in the coiled tubing back-up sand separate stratum fracfturing technology, coiled tubing is visited the sand face and is confirmed the effective packing situation of interlayer.
NM structure among the present invention, device and processing step are known technology in the industry, do not give unnecessary details one by one at this.
Claims (4)
1. one kind is passed through the method that sand plug spy sand face is squeezed in examination, and it is characterized by: this method may further comprise the steps at least:
The first step: wait for sand setting;
Second step: the sand plug is squeezed in examination;
The 3rd step: visit the sand face;
Said wait sand setting: treat to squeeze the sand plug by oil jacket infusion examination simultaneously after sand setting is accomplished; If repeatedly examination is squeezed; Pressure rises to the above 10Mpa of the perforated interval of constructing (1) fracture pressure; Then confirm to have constructed perforated interval (1) by effective shutoff; Adopt coiled tubing to carry the downhole tool string at last and visit the sand face to waiting to transform five meters (4) below the perforated interval; If do not meet sand face (2), transformation that then can perforated interval transformed (3).
2. based on the described a kind of method of squeezing sand plug spy sand face through examination of claim 1, it is characterized by: described examination is waited for sand setting 4 hours before squeezing the sand plug.
3. according to claim 1ly a kind ofly squeeze the method that the sand plug is visited the sand face through examination, it is characterized by: the sand plug is squeezed in described examination, and whether definite perforated interval (1) of having constructed is during by effective shutoff, and coiled tubing float amount 100-150L/min, annular space are with 0.3m
3The discharge capacity of/min, pump notes boosting sand plug puts in place simultaneously, if the sand plug puts in place; Termination of pumping when pressure rises to the above 10Mpa of the perforated interval of constructing (1) fracture pressure; After pressure dropped to below the 20Mpa, the sand plug was squeezed in examination once more, and pressure reaches 10Mpa on perforated interval (1) fracture pressure of having constructed once more; Confirm that then the sand plug puts in place, the perforated interval (1) of promptly having constructed is by effective packing.
4. based on the described a kind of method of squeezing sand plug spy sand face through examination of claim 1; It is characterized by: during described spy sand face, following coiled tubing is visited the sand face to waiting to transform five meters (4) perforated interval below, if spy is less than sand face (2); Transformation that then can perforated interval transformed (3); If perforated interval buried, or pocket stay not enough, then carry out the sand washing operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210255207.4A CN102733794B (en) | 2012-07-23 | 2012-07-23 | A kind of method of being squeezed sand plug spy sand face by examination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210255207.4A CN102733794B (en) | 2012-07-23 | 2012-07-23 | A kind of method of being squeezed sand plug spy sand face by examination |
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| CN102733794A true CN102733794A (en) | 2012-10-17 |
| CN102733794B CN102733794B (en) | 2015-07-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869121A (en) * | 2019-03-18 | 2019-06-11 | 中国石油化工股份有限公司 | The mechanical sand control technique of small casing pipe well |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4813730A (en) * | 1987-06-19 | 1989-03-21 | Terral Ben D | Retrieval device for a well control tool |
| US20020011339A1 (en) * | 2000-07-07 | 2002-01-31 | Murray Douglas J. | Through-tubing multilateral system |
| CN201650197U (en) * | 2010-04-26 | 2010-11-24 | 中国石油集团川庆钻探工程有限公司 | Packer extruding and sealing device |
| CN102562017A (en) * | 2010-12-29 | 2012-07-11 | 安东石油技术（集团）有限公司 | Sand blasting, perforating and fracturing method |
-
2012
- 2012-07-23 CN CN201210255207.4A patent/CN102733794B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4813730A (en) * | 1987-06-19 | 1989-03-21 | Terral Ben D | Retrieval device for a well control tool |
| US20020011339A1 (en) * | 2000-07-07 | 2002-01-31 | Murray Douglas J. | Through-tubing multilateral system |
| CN201650197U (en) * | 2010-04-26 | 2010-11-24 | 中国石油集团川庆钻探工程有限公司 | Packer extruding and sealing device |
| CN102562017A (en) * | 2010-12-29 | 2012-07-11 | 安东石油技术（集团）有限公司 | Sand blasting, perforating and fracturing method |
Non-Patent Citations (1)
| Title |
|---|
| 吴成斌等: "水力喷射环空压裂技术在合川区块的应用", 《油气井测试》, vol. 21, no. 1, 29 February 2012 (2012-02-29), pages 51 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869121A (en) * | 2019-03-18 | 2019-06-11 | 中国石油化工股份有限公司 | The mechanical sand control technique of small casing pipe well |
| CN109869121B (en) * | 2019-03-18 | 2021-02-19 | 中国石油化工股份有限公司 | Mechanical sand prevention process for small cased well |
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| Publication number | Publication date |
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| CN102733794B (en) | 2015-07-29 |
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Effective date of registration: 20211020 Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING Co. Address before: 710018 room 1207, Changqing building, Changqing Xing Long Yuan District, Xi'an, Shaanxi Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. |
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