Cross-linked plugging agent stimulated by high density brine and preparing method thereof

a plugging agent and high density brine technology, applied in the field of oilfield chemistry, can solve the problems of increasing the cost, increasing the requirement, and high cost during well completion and workover, and achieves the effects of good pumpability, effective protection of the reservoir, and viscosity of the plugging agen
US20210108122A1Inactive Publication Date: 2021-04-15SOUTHWEST PETROLEUM UNIV
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2021-04-15
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention disclosed a cross-linked plugging agent stimulated by high density brine which comprises main agent: 10 wt %-90 wt %, gelling agent: 0.5 wt %-9 wt % and pure water; wherein the main agent is selected from the group consisting of a Dipotassium phosphate (K2HPO4), a Tripotassium phosphate (K3PO4) and a Potassium pyrophosphate (K4P2O7), a Potassium Dihydrogen Phosphate (KH2PO4), a Sodium dihydrogen phosphate (NaH2PO4); the gelling agent is selected from the group consisting of a Xanthan gum and a kappa carrageenan. The gelling time is controlled within 0.5-12 h under an experiment temperature of 90° C.-160° C. The final gelling strength is controlled within D-H. The density is controlled within 1.0-1.55 g / cm3. The plugging agent is able to be applied in well completion and workover under high temperature, high pressure, multi-pressure series of strata oil and gas environment when temporary blockage and leak proof is required, protection of reservoir near perforations and water plugging.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS REFERENCE OF RELATED APPLICATION

[0001] This is a Continuation Application of the International Application PCT / CN2020 / 076004, filed Feb. 2, 2020, which claims priority under 35 U.S.C. 119(a-d) to CN 202010094980.1, filed Feb. 17, 2020.BACKGROUND OF THE PRESENT INVENTIONField of Invention

[0002] The present invention relates to oilfield chemistry, which is widely applied in well completion and workover under high temperature, high pressure, multi-pressure oil and gas environment and is applied in temporary blocking agent, perforating protect fluid and water shutoff agent. The present invention is more particularly related to the cross-linked plugging agent stimulated by high density brine and the preparing method thereof.Description of Related Arts

[0003] The reservoir development goes deeper and deeper to reach deep and ultra-deep formation where the geological condition is complicate and prone to change. Many challenges and difficulties need to be dealt with such as high temperatu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More