Self-selective plugging and profile control agent based on aged oil and water plugging method

Abstract

The invention discloses a self-selective plugging and profile control agent based on aged oil and a water plugging method, and belongs to the field of water plugging and profile control. The agent comprises a front emulsified water slug, an aged oil main slug and a demulsification control slug. The front emulsified water slug comprises an emulsifying aid and water. The aged oil main slug comprisesdehydrated aged oil with the water content smaller than or equal to 0.5%, an emulsifying agent and a stabilizing agent. The demulsification control slug comprises a demulsification control agent andwater. The self-selective plugging and profile control agent not only has the advantages of oil-water selectivity, secondary plugging and the like, but also can realize reasonable reutilization, digestion safety and environmental protection hidden danger of waste oil, can be effectively applied to the aspects of in-layer water plugging of complex oil wells, water plugging and controlling treatmentof horizontal wells, plugging of near-well large ducts and the like, and meets the requirements of oil well exploitation.

Description

technical field

[0001] The invention relates to the field of water plugging and profile control, in particular to a self-selective plugging adjustment agent and a water plugging method based on aging oil. Background technique

[0002] Water shutoff agents are usually used in the oil field water shutoff process. According to the different plugging effects of water shutoff agents on oil and water layers, they can be divided into non-selective water shutoff and selective water shutoff. Among them, selective water shutoff Selective water blocking based on the difference in properties between the water outlet layers can be divided into surfactants, foams, emulsified oil-soluble resins, and emulsified heavy oils. Taking emulsified oil-soluble resins and emulsified heavy oils as examples, the prior art provides a crude oil emulsifier for oil field water plugging and its preparation method and application. It uses dimethylamine and epichlorohydrin as raw materials to prepare oil-in-...

Examples

Embodiment 1

[0067] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0068] The pre-emulsified water slug includes: 1.0 parts by weight of alkyl glycoside and 150 parts by weight of water.

[0069] The aging oil main slug comprises: 200 parts by weight of dehydrated aging oil with a moisture content of less than 0.5%, 2 parts by weight of sorbitan fatty acid ester, and 0.1 part by weight of hydroxypropyl methylcellulose.

[0070] The emulsification control slug comprises: 15 parts by weight of sodium carboxylate solution and 150 parts by weight of water.

[0071] Wherein, the preparation method of the aging oil main slug is as follows:

[0072] Preheat the designed amount of aging oil to 50°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 160°C, dehydrate continuously for 3h / time, measure the water content by distillation until the water content is less than 0.5% to obtain dehydr...

Embodiment 2

[0075] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0076] The pre-emulsified water slug comprises: 1.2 parts by weight of phosphate betaine and 160 parts by weight of water.

[0077] The aged oil main slug comprises: 240 parts by weight of dehydrated aged oil with a moisture content of less than 0.5%, 3 parts by weight of a quaternary ammonium salt type gemini surfactant, and 0.2 parts by weight of calcium-based bentonite.

[0078] The emulsification control slug comprises: 16 parts by weight of calcium chloride solution and 160 parts by weight of water.

[0079] Wherein, the preparation method of the aging oil main slug is as follows:

[0080] Preheat the designed amount of aging oil to 40°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 150°C, dehydrate continuously for 2.5h / time, measure the water content by distillation until the water content is less than 0...

Embodiment 3

[0083] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0084] The pre-emulsified water slug includes: 0.8 parts by weight of phosphate betaine and 170 parts by weight of water.

[0085] The aging oil main slug comprises: 180 parts by weight of dehydrated aging oil with a water content less than 0.5%, 4 parts by weight of sorbitan fatty acid ester, and 0.05 part by weight of hydroxypropyl methylcellulose.

[0086] The emulsification control slug comprises: 20 parts by weight of sodium bicarbonate solution, and 170 parts by weight of water.

[0087] Wherein, the preparation method of the aging oil main slug is as follows:

[0088] Preheat the designed amount of aging oil to 45°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 155°C, dehydrate continuously for 3h / time, measure the water content by distillation until the water content is less than 0.5% to obtain dehydrat...

technical field

[0001] The invention relates to the field of water plugging and profile control, in particular to a self-selective plugging adjustment agent and a water plugging method based on aging oil. Background technique

[0002] Water shutoff agents are usually used in the oil field water shutoff process. According to the different plugging effects of water shutoff agents on oil and water layers, they can be divided into non-selective water shutoff and selective water shutoff. Among them, selective water shutoff Selective water blocking based on the difference in properties between the water outlet layers can be divided into surfactants, foams, emulsified oil-soluble resins, and emulsified heavy oils. Taking emulsified oil-soluble resins and emulsified heavy oils as examples, the prior art provides a crude oil emulsifier for oil field water plugging and its preparation method and application. It uses dimethylamine and epichlorohydrin as raw materials to prepare oil-in-...

Examples

Embodiment 1

[0067] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0068] The pre-emulsified water slug includes: 1.0 parts by weight of alkyl glycoside and 150 parts by weight of water.

[0069] The aging oil main slug comprises: 200 parts by weight of dehydrated aging oil with a moisture content of less than 0.5%, 2 parts by weight of sorbitan fatty acid ester, and 0.1 part by weight of hydroxypropyl methylcellulose.

[0070] The emulsification control slug comprises: 15 parts by weight of sodium carboxylate solution and 150 parts by weight of water.

[0071] Wherein, the preparation method of the aging oil main slug is as follows:

[0072] Preheat the designed amount of aging oil to 50°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 160°C, dehydrate continuously for 3h / time, measure the water content by distillation until the water content is less than 0.5% to obtain dehydr...

Embodiment 2

[0075] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0076] The pre-emulsified water slug comprises: 1.2 parts by weight of phosphate betaine and 160 parts by weight of water.

[0077] The aged oil main slug comprises: 240 parts by weight of dehydrated aged oil with a moisture content of less than 0.5%, 3 parts by weight of a quaternary ammonium salt type gemini surfactant, and 0.2 parts by weight of calcium-based bentonite.

[0078] The emulsification control slug comprises: 16 parts by weight of calcium chloride solution and 160 parts by weight of water.

[0079] Wherein, the preparation method of the aging oil main slug is as follows:

[0080] Preheat the designed amount of aging oil to 40°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 150°C, dehydrate continuously for 2.5h / time, measure the water content by distillation until the water content is less than 0...

Embodiment 3

[0083] The present embodiment provides a self-selective plugging agent, which includes the following components by weight:

[0084] The pre-emulsified water slug includes: 0.8 parts by weight of phosphate betaine and 170 parts by weight of water.

[0085] The aging oil main slug comprises: 180 parts by weight of dehydrated aging oil with a water content less than 0.5%, 4 parts by weight of sorbitan fatty acid ester, and 0.05 part by weight of hydroxypropyl methylcellulose.

[0086] The emulsification control slug comprises: 20 parts by weight of sodium bicarbonate solution, and 170 parts by weight of water.

[0087] Wherein, the preparation method of the aging oil main slug is as follows:

[0088] Preheat the designed amount of aging oil to 45°C, add it to the crude oil ultrasonic thermal dehydration device, raise the temperature to 155°C, dehydrate continuously for 3h / time, measure the water content by distillation until the water content is less than 0.5% to obtain dehydrat...