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Thin and shallow layer super heavy oil horizontal well, viscosity reducer, nitrogen and steam assisted huff and puff method

A technology of auxiliary steam and viscosity reducer, which is applied in the fields of horizontal wells, viscosity reducers, and nitrogen-assisted steam huff and puff composite production in thin and shallow super-heavy oil reservoirs, which can solve the problems of reducing the viscosity of crude oil and increasing the drainage area. The effect of reducing steam injection pressure, large oil drainage area, and increasing the degree of reserve production

Inactive Publication Date: 2015-07-01
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies can only meet one or several requirements in the development of thin and shallow ultra-heavy oil reservoirs, and cannot well and comprehensively solve the production problems of thin and shallow ultra-heavy oil reservoirs. Therefore, a new type of The production technology of ultra-heavy oil reservoirs with thin and shallow layers can reduce the viscosity of crude oil, replenish formation energy, reduce steam injection pressure, prevent steam overburden, reduce formation heat loss, and increase the drainage area.

Method used

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  • Thin and shallow layer super heavy oil horizontal well, viscosity reducer, nitrogen and steam assisted huff and puff method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The technical method is carried out as follows:

[0041] Optimize the design of construction parameters, and use reservoir engineering and numerical simulation methods to design parameters for horizontal wells, viscosity reducers, nitrogen, and steam.

[0042] a. Drilling horizontal wells The length of the horizontal well section is 120m, and the well spacing and row spacing are 120m;

[0043] b. Inject viscosity reducer Calculate the volume of the tubing, first use the viscosity reducer to replace the liquid in the tubing, then close the casing valve, and then inject 5t of oil-soluble viscosity reducer into the wellbore;

[0044] c. Injecting nitrogen using a nitrogen injection truck to inject 30,000Nm with a purity of more than 95% 3 Nitrogen is injected into the oil layer through the annulus of the oil jacket, which can dissolve and reduce viscosity, heat insulation, replenish formation energy, and expand the steam sweeping range. After injecting nitrogen into the ...

Embodiment 2

[0051] The technique proceeds as follows:

[0052] a. Drilling horizontal wells The length of the horizontal well section is 200m, and the well spacing and row spacing are 160m;

[0053] b. Injection of viscosity reducer Calculate the volume of the tubing, first use the viscosity reducer to replace the liquid in the tubing, then close the casing valve, and then inject 20t of oil-soluble viscosity reducer into the wellbore;

[0054] c. Injecting nitrogen gas 50000Nm through the oil jacket annulus 3 ; When injecting nitrogen, use a nitrogen injection truck to inject nitrogen with a purity of more than 95% into the oil layer, which can play a role in dissolution and viscosity reduction, heat insulation, supplementation of formation energy, and expansion of steam coverage. After injecting nitrogen into the well through the oil-casing annulus, close the wellhead casing gate to ensure that the nitrogen is always filled with the oil-casing annulus during the subsequent steam injecti...

Embodiment 3

[0061] The method proceeds as follows:

[0062] a. Drilling horizontal wells The length of the horizontal well section is 160m, and the well spacing and row spacing are 140m;

[0063] b. Injection of viscosity reducer Calculate the volume of the tubing, first use the viscosity reducer to replace the liquid in the tubing, then close the casing valve, and then inject 12.5t of oil-soluble viscosity reducer into the wellbore;

[0064] c. Injecting nitrogen gas 40000Nm through the oil jacket annulus 3; When injecting nitrogen, use a nitrogen injection truck to inject nitrogen with a purity of more than 95% into the oil layer, which can play a role in dissolution and viscosity reduction, heat insulation, supplementation of formation energy, and expansion of steam coverage. After injecting nitrogen into the well through the oil-casing annulus, close the wellhead casing gate to ensure that the nitrogen is always filled with the oil-casing annulus during the subsequent steam injection...

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Abstract

The invention provides a thin and shallow layer super heavy oil horizontal well, viscosity reducer, nitrogen and steam assisted huff and puff method, and belongs to the technical field of oil field production. The method includes the steps of firstly, drilling holes in a horizontal well; secondly, filling an oil pipe with oil-soluble viscosity reducers, closing a sleeve valve, and continuing to fill a well shaft with the oil-soluble viscosity reducers; thirdly, filling an oil sleeve with nitrogen in an annulus mode; fourthly, filling the oil pipe with steam through a filling and production integrated pipe column; fifthly, conducting soaking for 2 hours to 4 hours; sixthly, controlling flow opening through an oil nozzle when the pressure of a well opening falls to 0.5 MPa / d; seventhly, starting the pumping when conducting flow opening to the liquid amount of 3t / d. By means of the composite heavy oil development mode integrating the horizontal well, the viscosity reducers, the nitrogen and the steam, by means of the comprehensive effect of all elements, the steam swept volume is remarkably improved, the viscosity of crude oil is reduced, the energy of a stratum is compensated for, the steam filling pressure is reduced, the steam overlapping is avoided, the thermal loss of the stratum is reduced, and the oil driving efficiency and crude oil flowing capacity are improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a composite recovery method of horizontal wells, viscosity reducers, and nitrogen-assisted steam huff and puff in thin and shallow ultra-heavy oil reservoirs. Background technique [0002] In recent years, the development of ultra-heavy oil has increasingly attracted the attention of the petroleum industry. my country has made remarkable progress in the development of ultra-heavy oil, including supercritical steam injection, SAGD, HDCS and other technologies in the development of some special ultra-heavy oil reservoirs. It played an important role. However, the development of thin and shallow ultra-heavy oil reservoirs has the following problems: (1) The viscosity of crude oil is high, and the production range of conventional steam stimulation technology is small; (2) The reservoir is buried shallow, the production pressure difference is small, and it is difficul...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/24E21B43/30E21B7/04
CPCE21B43/16E21B43/168E21B43/24E21B43/30
Inventor 杨元亮朱桂林王学忠王金铸乔明全任福生董岩席伟军
Owner CHINA PETROLEUM & CHEM CORP
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