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Cold damage prevention dredging agent for low-temperature-resistant oil reservoir

A dredging agent and low temperature-resistant technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve problems such as blockage of oil production screens, retention of fine pores in heterogeneous rock formations, and inability to implement stimulation operations in oil fields. Achieve the effect of improving oil recovery and avoiding the problem of blockage and production reduction

Active Publication Date: 2020-11-17
王誉清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, to provide a low-temperature-resistant oil reservoir anti-cold damage dredging agent, which is mainly used for dredging the oil flow channels of the oil reservoir in the oil production block of the oil field, and effectively solves the problem of oil reservoir damage. Pore ​​blockage problem, micro-pore retention problem in heterogeneous rock formations, colloidal, asphaltene, waxy and crude oil heavy component deposition problems near the wellbore, oil production screen plugging, etc.; the dredging agent can quickly and efficiently dilute, disperse and dissolve The organic blockage can be dredged. The dredging agent is an oil-soluble preparation, and has the functions of high permeability, solubility, dispersion and dilution, etc. It can normally carry out dredging and increasing production operations at a low temperature of minus -40°C, which solves the problem of severe cold conditions in oil fields. The problem of not being able to implement production increase operation in season

Method used

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  • Cold damage prevention dredging agent for low-temperature-resistant oil reservoir
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  • Cold damage prevention dredging agent for low-temperature-resistant oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: The present invention adopts the mode of one injection and multiple extractions, and the specific injection well group and the distribution map of benefited well positions refer to figure 1 :

[0052] Injection well group:

[0053] (Wang 82) (Wang 36-6) (Wang 72-2) (Wang 36-2) (53-6) Total injection wells: 5

[0054] Unilateral benefit well:

[0055] (King 53-1) (King 53-4) (King 53-7) (King 36-4) (King 82-1) (King 82-2)

[0056] (King 82-3) (King 82-4) (King 72-4) Unilateral total: 9 wells

[0057] Bilateral benefits:

[0058] (King 53-2) (King 82-5) (King 36) (King 36-1) (King 36-3) (King 36-5

[0059] (King 36-7) (King 36-8) Bilateral total: 8 wells

[0060] Implementation of dredging plan formulation:

[0061] According to the actual situation that the oil production block is a low-permeability oil layer, combined with the geological data provided by the oil production plant, as well as the production account and other data, after communicating ...

Embodiment 2

[0080] Embodiment 2, the present invention adopts the mode of single well injection / reversal:

[0081] According to the actual situation of each oil production well, combined with the geological data provided by the oil production plant, as well as production ledger and other data. After communicating with the technical department of the oil production plant, the specific implementation plan is formulated as follows after joint research and judgment.

[0082] The total injection volume of the designed dredging agent:

[0083] (1) Calculated according to the well depth of the production well, the length of the production section, and the dredging sweep radius.

[0084] (2) The total injection volume *0.25~3 is the oil layer saturation amount, and the saturation amount *0.5~2 is the loss amount of the heterogeneous oil layer.

[0085] (3) Reservoir saturation amount + heterogeneous oil layer loss amount = design injection total amount.

[0086] The implementation dredging pla...

Embodiment 3

[0103] Embodiment 3, high water cut well or low productivity well

[0104] As the years of oilfield exploitation increase, such as the increase in the number of high water-cut oil wells and low-production oil wells, it is also called aging wells.

[0105] Most of the oil layers in the oil production block are plane heterogeneous oil layers. With the extension of the production time of the oil production well, the deposition of heavy components of crude oil is more serious, and at the same time, the adsorption force of organic blockages on the oil flow channels is enhanced, which leads to water leakage in the large pores near the wellbore, and blockage or retention in the micro pores The problem.

[0106] According to the content of crude oil components in different oil production blocks, such as colloid, asphaltene, wax, etc., different proportions of dredging agent formulas are formulated to ensure the purpose of increasing production after dredging. The dredging agent is a...

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Abstract

The invention relates to a cold damage prevention dredging agent for a low-temperature-resistant oil reservoir. The technical scheme is as follows: the dredging agent is mainly prepared from the following components in parts by weight: 3-23 parts of paraffin oil, 23-52 parts of reformed C10 solvent oil, 15-55 parts of white oil, 11-31 parts of diisononyl phthalate and 0.25-3 parts of a TX-4 emulsifier (alkylphenol and ethylene oxide condensate). The dredging agent has the beneficial effects that the dredging agent is an oil-soluble preparation and has the characteristics of low temperature resistance and cold damage prevention; and the dredging agent can quickly dilute, disperse and dissolve organic blockages in an oil reservoir, recover the porosity of the oil reservoir, improve the seepage capacity of a rock stratum, accelerate the migration speed of an oil-water mixture in the rock stratum, and achieve the purposes of improving the recovery ratio and increasing the yield.

Description

technical field [0001] The invention relates to a chemical preparation injected downhole in the field of oil production in an oil field, in particular to a dredging agent for preventing cold damage of low-temperature resistant oil reservoirs. Background technique [0002] At present, the production reduction problems encountered by major oil fields are analyzed in detail as follows: [0003] Oil reservoir blockage and water injection pressure increase: due to the strong adsorption of heavy components of crude oil, the blockage problem caused by the deposition in the oil flow channel makes the fluidity of the oil-water mixture in the oil flow channel poor and the migration speed decreases, resulting in production cuts. [0004] The problem of rising water cut and declining oil production: the planar heterogeneous oil rock formations of oil reservoirs are relatively serious. Due to problems such as the kinematic viscosity relationship of oil-water mixture, the back force rela...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22E21B31/00
CPCE21B43/16E21B31/00
Inventor 王子轩王逸琦王梦溪王誉清
Owner 王誉清
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