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Oil field negative pressure flowback blockage removal process

A negative pressure, oil field technology, applied in the direction of production fluids, wellbore/well components, earthwork drilling, etc., to avoid blowout tripping, low safety risk points, and prevent formation leakage and pollution

Inactive Publication Date: 2020-12-25
SHENGLI OILFIELD DONGRUN MACHINERY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a negative pressure flowback blockage removal process in an oil field. While optimizing the flowback pump negative pressure flowback blockage removal process, the process solves the problems of removing formation impurities and near-well blockage, dredging seepage channels, and improving single well productivity. technical problem

Method used

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  • Oil field negative pressure flowback blockage removal process
  • Oil field negative pressure flowback blockage removal process
  • Oil field negative pressure flowback blockage removal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 CACB1GA-3 Well Flowback Pump Negative Pressure Flowback and Blockage Removal

[0031] 1. Basic data:

[0032] ;

[0033] 2. Reservoir data:

[0034] ;

[0035] 3. Flowback pump string (such as figure 1 shown) and supporting tools:

[0036] The first oil pipe 2, the second oil pipe 6, the third oil pipe 8: N80, 89mmEU oil pipe;

[0037] Plug valve 1: 89mmEU pressure resistance 80MPa;

[0038] Packer 5: RTTS-150;

[0039] Oil drain 3: outer diameter 89mmEUE-SLP-FF25MPa;

[0040] Flowback pump 4: outer diameter 134mm inner diameter 120mm, effective stroke 7.0m, buckle type 89mmEU;

[0041] Precision microporous composite sand filter tube 7: filtration accuracy 150μm, outer diameter 108mm*5m;

[0042] Plug 9: outer diameter 89mmEU;

[0043] Supporting tools: faucet and kelly (lifting tool).

[0044] 4. Construction steps:

[0045] (1) Lower flowback string: refer to the schematic diagram of the lowering depth of the flowback pump string (such as ...

Embodiment 2

[0055] Example 2 Flowback Pump Negative Pressure Blockage Removal in Well CASH201A-20

[0056] 1. Basic data:

[0057] .

[0058] 2. Reservoir data:

[0059] .

[0060] 3. Flowback pump string (such as figure 1 shown) and supporting tools:

[0061] The first oil pipe, the second oil pipe, the third oil pipe: N89mmEU oil pipe;

[0062] Plug valve: N80, 89mmEU pressure resistance 80MPa;

[0063] Packer: RTTS-150;

[0064] Oil drain: OD 89mm EUE-SLP-FF 25MPa;

[0065] Flowback pump: outer diameter 134mm inner diameter 120mm, effective stroke 7.0m, buckle type 89mmEU;

[0066] Precision microporous composite sand filter tube: filtration accuracy 150μm, outer diameter 108mm*5m;

[0067] Plug: outer diameter 89mmEU;

[0068] Supporting tools: faucet and kelly (lifting tool).

[0069] 4. Construction steps:

[0070] (1) Lower flowback string: refer to the tool depth of the flowback pump string schematic diagram (such as Figure 4 As shown) connect the pipe string, se...

Embodiment 3

[0080] Example 3 Technical comparison with the existing flowback process

[0081] 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 3.

[0082] Table 3 Construction items and cost data

[0083] .

[0084] 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 4:

[0085] Table 4 Flowback Risk Points

[0086]...

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Abstract

The invention provides an oil field negative pressure flowback blockage removal process, and belongs to the technical field of oil well flowback blockage removal. According to the oil field negative pressure flowback blockage removal process, the flowback pump negative pressure flowback blockage removal process is optimized and implemented, and meanwhile the technical problems about blockage removal of stratum impurities and near-well blockage, dredging of a seepage channel and improvement of single-well productivity are solved; and meanwhile, when the process is applied to blockage removal ofnew and old wells on the sea, ship-assisted implementation is not needed, limitation of environmental factors is avoided, flowback well fluid obtained after blockage removal can be directly introduced into a flowback well fluid online treatment device and is fed into the subsequent production process after being filtered, and the process has the remarkable advantages of being low in cost, low inconstruction pressure, low in 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): E21B43/16E21B43/22E21B43/08E21B21/06E21B21/01
CPCE21B21/01E21B21/063E21B43/086E21B43/16
Inventor 薛居生贾龙江张松
Owner SHENGLI OILFIELD DONGRUN MACHINERY ENG
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