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Negative-pressure flowback blockage removal process for oil field

A negative pressure, oilfield technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of difficulty in popularization, high cost, and difficult evaluation of plugging removal effect, so as to avoid blowout and trip out , low safety risk points, and the effect of reducing formation leakage pollution

Inactive Publication Date: 2021-01-05
SHENGLI OILFIELD DONGRUN MACHINERY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional nitrogen foam flowback plugging removal method is expensive. Since it is applied in new and old offshore wells, it is easily restricted by the working conditions of the flowback tanker and offshore weather. It is difficult to evaluate the plugging removal effect, and it is difficult to promote it.

Method used

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  • Negative-pressure flowback blockage removal process for oil field
  • Negative-pressure flowback blockage removal process for oil field
  • Negative-pressure flowback blockage removal process for oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 CASH201A-20 Well Flowback Pump Negative Pressure Flowback and Blockage Removal

[0036] 1. Basic data:

[0037] .

[0038] 2. Reservoir data:

[0039] .

[0040] 3. Formation acidizing plugging removal:

[0041] Pre-connect the construction oil pipe, test the pressure of the pipeline at 25MPa, stabilize the pressure for 10 minutes, and the pressure drop is less than 0.7MPa. is qualified;

[0042] First replace 1 / 3 of the pre-treatment fluid through the oil pipe (7m 3 ) to the oil zone near the wellbore, close the casing gate; then squeeze 2 / 3 of the pre-treatment fluid (18m 3 ), the main acid plugging solution (25m 3 ) and active water post solution (25m 3), observe the wellhead pressure during the construction process, control the casing pressure within 10MPa, and remove the plugging as much as possible; close the wellhead gate, install a pressure gauge at the wellhead, shut down the well for 1-2 hours, and proceed to the next step after the press...

Embodiment 2

[0063] Example 2 Technical comparison with the existing flowback process

[0064] The flowback and blockage removal method currently adopted is the nitrogen foam flowback and blockage removal method, but its cost is relatively high, and since it is applied in new and old offshore wells, it is easily subject to the larger constraints of flowback tanker working conditions and marine weather. Compared with it, the present invention The negative pressure flowback method provided by the flowback pump has significant advantages in terms of the cost of the mobile platform, the integration of mining and repairing platform, construction equipment, and construction period, as shown in Table 2.

[0065] Table 2 Construction items and cost data

[0066] .

[0067] In addition to the significant advantages in terms of construction projects and costs, the safety and risk points of the entire project were also compared, as shown in Table 3:

[0068] Table 3 Flowback Risk Points

[0069]...

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Abstract

The invention provides a negative-pressure flowback blockage removal process for an oil field, and belongs to the technical field of flowback blockage removal of oil wells. According to the negative-pressure flowback blockage removal process for the oil field, the problems of compaction and blockage pollution caused by slurry filtrate invasion and perforation are further solved while the negative-pressure flowback blockage removal process for a flowback pump is optimized and implemented, and the single-well productivity is effectively improved; meanwhile, an acidification blockage removal stepis introduced into the flowback blockage removal process, and pollutants in slurry filtrate in a near-wellbore area are effectively removed; in addition, when the flowback blockage removal process isapplied to blockage removal of new and old wells on the sea, ship-assisted implementation is not needed, the process is not limited by environmental factors, flowback well fluid obtained after blockage removal can be directly introduced into a flowback well fluid online treatment device, and the flowback well fluid is filtered and then sent to a subsequent production process; and the process hasthe remarkable advantages of being low in cost, construction pressure and safety risk point and the like.

Description

technical field [0001] The invention belongs to the technical field of oil well flowback and blocking removal, and in particular relates to an oil field negative pressure flowback and blocking removal technology. Background technique [0002] During the production process of oil wells transporting sandstone reservoirs in oilfields, clay hydration (mineral expansion and migration) occurs due to unqualified well fluid and solid particle invasion, and changes in environmental conditions cause colloids, asphaltenes, waxes, etc. Condensation and accumulation of oily components lead to blockage near the wellbore, seriously affecting the production of oil wells. [0003] At present, the conventional nitrogen foam flowback plugging removal method is expensive. Since it has been applied in new and old offshore wells, it is easily restricted by the working conditions of the flowback tanker and offshore weather. It is difficult to evaluate the plugging removal effect, and it is difficu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/22E21B21/06E21B21/01C09K8/524
CPCC09K8/524C09K2208/12C09K2208/32E21B21/01E21B21/063E21B43/16
Inventor 薛居生贾龙江张松
Owner SHENGLI OILFIELD DONGRUN MACHINERY ENG
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