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Solid wax-resisting scale inhibitor for well

A technology of anti-scaling agent and anti-wax agent, which is applied in the field of chemical wax removal and anti-scaling in oil production wells, and can solve the problems of poor effect of wax removal and scale removal

Inactive Publication Date: 2005-09-28
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of the prior art that have poor wax removal and scale removal effects in oil wells, the present invention provides downhole solid wax and scale inhibitors. This technology selects several chemical agents in a targeted manner according to the wax deposition and scaling rules of oil wells. Utilizing the slow-release characteristics of some polymer chemical materials, it is made into a solid form that meets the requirements, connected to the lower end of the oil well pump, injected once during operation, and slowly dissolved with the flushing of the oil flow at the bottom of the well. The dissolved wax and wax The antiscalant components fully act on the inside of the oil pipe and the oil well pump, which can effectively inhibit the accumulation and growth of wax molecules and the deposition of scale, so that the wax crystal particles and scale remain in a micro-dispersed state, and are pumped out of the ground together with the oil flow, preventing wax and dirt. Dirty good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: with the above-mentioned compounded anti-wax agent: ethylene vinyl acetate copolymer 56.6%, high-pressure polyethylene 37.7%, 5.7% surfactant (its proportioning is Ninaer: AEO-7: alkylbenzene Sodium sulfonate = 1:2.5:1), the scale inhibitor concentration is 4mg / L, the wax and scale inhibitors are cured at a ratio of 70:30 to make a built-in wax and scale inhibitor in solid form, and the shell is selected from 3 Inch tubing is used as the main body. In order to prevent the drug block from collapsing in the later stage of use, it is lined with a central pipe. 2 per well, placed on the upper part of the screen. The wax and scale inhibitor is cylindrical in shape with an outer diameter of 74mm, an inner diameter of 38mm and a thickness of 40mm.

Embodiment 2

[0021] Embodiment 2: the above-mentioned anti-wax agent compounded: ethylene vinyl acetate copolymer 56.6%, high-pressure polyethylene 37.7%, 5.7% surfactant (its proportioning is Ninar: AEO-7: alkylbenzene Sodium sulfonate = 1:2.5:1), the scale inhibitor concentration is 6mg / L, the wax and scale inhibitors are cured at a ratio of 70:30 to make the external wax and scale inhibitor in solid form, which consists of a baffle, It consists of four parts: central pipe, agent and joint, which are 2.5 meters long, and two are placed in the lower part of the screen for each well. The shape of the wax and scale inhibitor is cylindrical with an outer diameter of 74mm, an inner diameter of 38mm, and a thickness of 40mm (the best embodiment).

Embodiment 3

[0022] Embodiment 3: with the above-mentioned compounded anti-wax agent: 56.6% of ethylene vinyl acetate copolymer, high-pressure polyethylene 37.7%, 5.7% surfactant (its proportioning is Ni Naer: AEO-7: alkylbenzene Sodium sulfonate = 1:2.5:1), the scale inhibitor concentration is 10mg / L, the wax and scale inhibitors are cured at a ratio of 70:30 to make the built-in wax and scale inhibitors and the external wax inhibitors in solid form Antiscalant, made according to the situation of embodiment 1-2, is placed downhole.

[0023] For the application of wax and scale inhibitors, please refer to the attached table 1: 10 wells before the measures were taken to check the pump for 20 wells, on average 2 wells for a single well. Among them, 3 mouths for three times; 4 mouths for two times; 3 mouths for one time. The scale inspection period of 10 wells was 342 days. During this measure, all 10 wells had serious fouling at the operation site, and 8 wells were operated due to scale (6 ...

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Abstract

The present invention relates to belongs to the field of oil well wax-eliminating and scale inhibiting technology and provides one kind of solid wax-resisting scale inhibitor. Based on the wax solidifying and scaling law in oil well, some chemicals are selected and combined with some polymers with slow releasing function to produce into the solid wax-resisting scale inhibitor. The solid wax-resisting scale inhibitor is attached to bottom of oil pump and will be dissolved slowly by the flushing oil flow in well, and the dissolved wax-resisting scale inhibitor acts on the inside of oil pipe and oil pump to inhibit wax molecule aggregation and scaling, with the wax and scale being maintained in dispersed state and pumped to ground together with oil flow.

Description

technical field [0001] The invention relates to the technical field of chemical wax removal and scale prevention in oil production wells, and belongs to downhole solid wax and scale inhibitors. Background technique [0002] Scaling and waxing in oil wells in oil fields are becoming more and more serious. At the same time, the scaling form is changing from inorganic scaling to organic scaling, making it more difficult to control. Taking Daqing No. 1 Oil Mine as an example, by the end of 2000, there were 229 fouling wells in the whole mine, accounting for 60% of the number of wells opened, including 142 wells with inorganic scale and 87 wells with organic scale. Scaling and waxing in oil wells brings huge workload to oilfield development, affects oilfield production and increases cost losses, and greatly reduces the pump inspection cycle and comprehensive rework rate indicators. In 2000, 73 pump wells were inspected due to scale, accounting for 20.3% of the total pump inspect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06
Inventor 王佰君于长江高冬梅石庆传赵永辉
Owner DAQING OILFIELD CO LTD
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