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Oil and gas well workover working fluid

A technology for working fluids and oil and gas wells, applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve problems such as low bottom hole pressure, reduced production, reservoir damage, etc.

Inactive Publication Date: 2019-10-08
王豫园
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, the problems faced by workover operations are: in the late stage of oil and gas field development, the formation energy is insufficient, and the bottom hole pressure is lower than the hydrostatic column pressure; or multiple pressure formations are formed after long-term water injection development; workover operations cause reservoir damage, resulting in production Significantly reduced; ensure construction safety, especially the workover operations of H2S-containing oil and gas wells and offshore oil and gas wells; meet environmental protection requirements; reduce overall costs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022] The oil and gas well workover working fluid has the following mass content of each component: 0.5% of polymer, 0.5% of oil-soluble resin, 0.4% of sodium iminodisuccinic acid, and the balance of brine base fluid.

[0023] The brine base liquid is a mixture of calcium bromide and zinc bromide (1:1.2). The concentration of the brine base liquid is 70-80%. The polymer is hydroxyethyl cellulose. Described oil-soluble resin is sodium abietate, melamine formaldehyde resin. The sodium iminodisuccinate is tetrasodium iminodisuccinate.

Embodiment 2

[0025] The mass content of each component of the workover fluid for oil and gas wells is: 1% of polymer, 1% of oil-soluble resin, 0.8% of iminodisuccinic acid sodium salt, and the balance of brine base fluid.

[0026] The brine base liquid is a mixture of calcium bromide and zinc bromide (1:1.2). The concentration of the brine base liquid is 70-80%. The polymer is hydroxyethyl cellulose. Described oil-soluble resin is sodium abietate, melamine formaldehyde resin. The sodium iminodisuccinate is tetrasodium iminodisuccinate.

Embodiment 3

[0028] The oil and gas well workover working fluid has the following mass content of each component: 0.5% of polymer, 0.5% of oil-soluble resin, 0.8% of iminodisuccinic acid sodium salt, and the balance of brine base fluid.

[0029] The brine base liquid is a mixture of calcium bromide and zinc bromide (1:1.2). The concentration of the brine base liquid is 70-80%. The polymer is hydroxyethyl cellulose. Described oil-soluble resin is sodium abietate, melamine formaldehyde resin. The sodium iminodisuccinate is tetrasodium iminodisuccinate.

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Abstract

The invention discloses an oil and gas well workover working fluid. The working fluid is composed of a brine base liquid, a polymer, an oil-soluble resin, an iminodisuccinate sodium salt and a heat-sensitive auxiliary agent, and a mass content of each component is as follows: 0.5-1% of the polymer, 0.5-1% of the oil-soluble resin, 0.4-0.8% of the iminodisuccinate sodium salt, 0.1-2% of the heat-sensitive auxiliary agent, and the balance the brine base liquid. In the working fluid, by addition of the iminodisuccinate sodium salt, formation of various organic and inorganic precipitates can be prevented; the formed organic or inorganic precipitates and a shielding temporary-plugging layer of a well wall can be removed; and a dissolution corrosion reaction with acid-soluble minerals and cements in reservoir rocks can be produced to enlarge seepage channels. In the working fluid, by addition of the heat-sensitive auxiliary agent, rheological properties of the working fluid can be controlledby temperature regulation.

Description

technical field [0001] The present application relates to the technical field of organic chemistry, in particular, to an oil and gas well workover working fluid. Background technique [0002] During the process of oil production, gas production, water injection, and gas injection, oil and gas wells fail due to various factors, resulting in production and injection stoppages, which affect the normal operation of oil and gas wells. Workover operation is to eliminate downhole faults and restore oil and gas wells to normal work by taking manual measures. It is an important measure to increase single well production and recovery rate and prolong production cycle, and it is also an important means to tap the potential of old wells, discover new horizons and expand exploration results. [0003] Workover operations mainly include: salvage, jam release, pump inspection, casing repair, casing window opening, sand washing, sand control, wax removal, plugging removal, hole repairing an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514C09K8/508
CPCC09K8/5086C09K8/514C09K2208/18
Inventor 王豫园
Owner 王豫园
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